/* ============================================================
   ReviseKit — GCSE Science Revision App
   Dark premium theme with glassmorphism
   ============================================================ */

/* CSS Variables */
:root {
  --bg-deep: #080e1c;
  --bg-base: #0f1729;
  --bg-card: #141d32;
  --bg-elevated: #1a2540;
  --bg-hover: #1e2d4d;

  --glass-bg: rgba(255, 255, 255, 0.04);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-hover: rgba(255, 255, 255, 0.07);

  --accent-cyan: #00d4ff;
  --accent-cyan-dim: rgba(0, 212, 255, 0.15);
  --accent-cyan-glow: rgba(0, 212, 255, 0.3);
  --accent-amber: #ffb800;
  --accent-amber-dim: rgba(255, 184, 0, 0.15);
  --accent-green: #22c55e;
  --accent-green-dim: rgba(34, 197, 94, 0.15);

  --bio-color: #22c55e;
  --bio-dim: rgba(34, 197, 94, 0.12);
  --chem-color: #f59e0b;
  --chem-dim: rgba(245, 158, 11, 0.12);
  --phys-color: #00d4ff;
  --phys-dim: rgba(0, 212, 255, 0.12);
  --maths-color: #8b5cf6;
  --maths-dim: rgba(139, 92, 246, 0.12);
  --english-color: #ec4899;
  --english-dim: rgba(236, 72, 153, 0.12);

  --text-primary: #f0f4ff;
  --text-secondary: rgba(240, 244, 255, 0.65);
  --text-muted: rgba(240, 244, 255, 0.35);

  --rating-again: #ef4444;
  --rating-hard: #f97316;
  --rating-good: #22c55e;
  --rating-easy: #00d4ff;

  --font-heading: 'Plus Jakarta Sans', sans-serif;
  --font-body: 'Inter', sans-serif;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --shadow-sm: 0 2px 12px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 24px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
  --shadow-glow-cyan: 0 0 24px rgba(0, 212, 255, 0.25);
  --shadow-glow-amber: 0 0 24px rgba(255, 184, 0, 0.25);

  --nav-height: 64px;
  --max-width: 480px;
}

/* ============================================================ RESET */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  min-height: 100%;
  overflow-x: hidden;
  -webkit-tap-highlight-color: transparent;
}

body {
  background: var(--bg-deep);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Deep background pattern */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 20% -10%, rgba(0, 212, 255, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 110%, rgba(255, 184, 0, 0.04) 0%, transparent 60%),
    radial-gradient(ellipse 100% 80% at 50% 50%, rgba(15, 23, 41, 0.8) 0%, transparent 100%);
  pointer-events: none;
  z-index: 0;
}

/* ============================================================ APP LAYOUT */
#app {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  padding-bottom: 32px;
}

/* ============================================================ NAVBAR */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(8, 14, 28, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  /* FIX 4: More horizontal padding for breathing room */
  padding: 0 16px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
}

.brand-icon {
  font-size: 18px;
  filter: drop-shadow(0 0 8px var(--accent-cyan));
}

.brand-text {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.3px;
  background: linear-gradient(135deg, #fff 0%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-actions {
  display: flex;
  align-items: center;
  /* FIX 4: Better gap between header icons */
  gap: 8px;
}

.nav-btn {
  /* FIX 4: 44px touch targets for accessibility, FIX 10: labels below icons */
  min-width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  transition: all 0.2s;
  position: relative;
  font-size: 10px;
  padding: 4px 6px;
}

.nav-btn:hover {
  background: var(--glass-hover);
  color: var(--text-primary);
  border-color: rgba(255,255,255,0.15);
}

/* ============================================================ SCREENS */
.screen {
  display: none;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px 20px 80px;
  animation: screenIn 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.screen.active {
  display: block;
}

@keyframes screenIn {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============================================================ HOME SCREEN */
.home-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 24px;
}

.hero-title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 28px;
  line-height: 1.2;
  letter-spacing: -0.5px;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.hero-sub {
  color: var(--text-muted);
  font-size: 14px;
}

.streak-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 12px 16px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  flex-shrink: 0;
  min-width: 70px;
}

.streak-fire { font-size: 22px; }

.streak-num {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 22px;
  color: var(--accent-amber);
  line-height: 1;
  text-shadow: var(--shadow-glow-amber);
}

.streak-label {
  font-size: 10px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Quick stats */
.quick-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 20px;
}

.qstat {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 14px 12px;
  text-align: center;
  transition: all 0.2s;
}

.qstat:hover {
  background: var(--glass-hover);
}

.qstat-val {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 22px;
  color: var(--accent-cyan);
  margin-bottom: 2px;
}

.qstat-label {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

/* Study All button */
.study-all-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.12), rgba(0, 212, 255, 0.06));
  border: 1px solid rgba(0, 212, 255, 0.3);
  border-radius: var(--radius-lg);
  cursor: pointer;
  color: var(--text-primary);
  text-align: left;
  transition: all 0.25s;
  margin-bottom: 28px;
  position: relative;
  overflow: hidden;
}

.study-all-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.08), transparent);
  opacity: 0;
  transition: opacity 0.25s;
}

.study-all-btn:hover::before { opacity: 1; }
.study-all-btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-glow-cyan); }
.study-all-btn:active { transform: translateY(0); }

.study-all-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #000;
  font-size: 16px;
  flex-shrink: 0;
  box-shadow: 0 4px 16px rgba(0, 212, 255, 0.4);
}

.study-all-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 16px;
}

.study-all-sub {
  font-size: 12px;
  color: var(--text-secondary);
}

.study-all-arrow {
  margin-left: auto;
  color: var(--accent-cyan);
  flex-shrink: 0;
}

/* Section label */
.section-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-bottom: 12px;
}

/* Subject grid */
.subject-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.subject-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all 0.25s;
  position: relative;
  overflow: hidden;
}

.subject-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  border-radius: 3px 0 0 3px;
  background: var(--subject-color, var(--accent-cyan));
}

.subject-card:hover {
  background: var(--glass-hover);
  border-color: rgba(255,255,255,0.13);
  transform: translateX(3px);
}

.subject-card:active { transform: translateX(1px); }

.subject-icon-wrap {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  background: var(--subject-bg, rgba(0,212,255,0.1));
  flex-shrink: 0;
}

.subject-info { flex: 1; min-width: 0; }

.subject-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 17px;
  margin-bottom: 3px;
}

.subject-meta {
  font-size: 12px;
  color: var(--text-secondary);
}

.subject-progress-ring {
  flex-shrink: 0;
}

.ring-svg { display: block; }

.ring-track {
  fill: none;
  stroke: rgba(255,255,255,0.07);
  stroke-width: 4;
}

.ring-fill {
  fill: none;
  stroke-width: 4;
  stroke-linecap: round;
  transition: stroke-dashoffset 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  transform: rotate(-90deg);
  transform-origin: center;
}

.ring-label {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 11px;
  fill: var(--text-primary);
  text-anchor: middle;
  dominant-baseline: central;
}

/* ============================================================ SCREEN HEADER (shared) */
.screen-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}

.back-btn {
  /* FIX 5: 44px touch target for accessibility */
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  flex-shrink: 0;
}

.back-btn:hover { background: var(--glass-hover); color: var(--text-primary); }

.screen-title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 22px;
  line-height: 1.2;
}

.screen-sub {
  font-size: 13px;
  color: var(--text-muted);
}

/* ============================================================ TOPICS SCREEN */
.study-subject-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255,255,255,0.12);
  background: var(--glass-bg);
  color: var(--text-primary);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: 20px;
}

.study-subject-btn:hover {
  background: var(--glass-hover);
  border-color: rgba(255,255,255,0.18);
}

.topics-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.topic-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  cursor: pointer;
  transition: all 0.2s;
}

.topic-card:hover {
  background: var(--glass-hover);
  transform: translateX(2px);
}

.topic-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.topic-name {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 14px;
  flex: 1;
  min-width: 0;
  padding-right: 12px;
}

.topic-counts {
  display: flex;
  gap: 10px;
  flex-shrink: 0;
}

.topic-count-badge {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 500;
}

.tcb-due {
  background: rgba(239, 68, 68, 0.15);
  color: #ef4444;
}

.tcb-mastered {
  background: rgba(34, 197, 94, 0.12);
  color: var(--accent-green);
}

.tcb-new {
  background: rgba(255,255,255,0.07);
  color: var(--text-muted);
}

/* FIX 8: Progress bars taller and more vibrant */
.topic-progress-bar {
  height: 7px;
  background: rgba(255,255,255,0.07);
  border-radius: 6px;
  overflow: hidden;
  margin-top: 4px;
}

.topic-progress-fill {
  height: 100%;
  border-radius: 6px;
  background: var(--subject-color, var(--accent-cyan));
  filter: brightness(1.15);
  transition: width 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ============================================================ STUDY SESSION */
.study-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.study-progress-info {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 10px;
}

.study-progress-info span:first-child {
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 500;
}

.study-mode-badge {
  padding: 2px 8px;
  border-radius: 20px;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: rgba(0, 212, 255, 0.15);
  color: var(--accent-cyan);
}

.study-mode-badge.new-mode {
  background: rgba(255,255,255,0.08);
  color: var(--text-muted);
}

/* Session tier badge — shown during study/quiz sessions */
.session-tier-badge {
  padding: 2px 8px;
  border-radius: 20px;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.session-tier-badge.tier-foundation {
  background: rgba(255, 184, 0, 0.15);
  color: #ffb800;
}

.session-tier-badge.tier-higher {
  background: rgba(168, 85, 247, 0.15);
  color: #a855f7;
}

.end-session-btn {
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border);
  background: transparent;
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.end-session-btn:hover {
  border-color: rgba(239,68,68,0.4);
  color: #ef4444;
  background: rgba(239,68,68,0.08);
}

/* Progress bar */
.study-progress-bar-wrap {
  height: 3px;
  background: rgba(255,255,255,0.06);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 28px;
}

.study-progress-bar {
  height: 100%;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-amber));
  transition: width 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  width: 0%;
  box-shadow: 0 0 8px rgba(0,212,255,0.5);
}

/* Card scene / 3D flip */
.card-scene {
  width: 100%;
  min-height: 280px;
  perspective: 1200px;
  margin-bottom: 24px;
  cursor: pointer;
}

.card-container {
  width: 100%;
  min-height: 280px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.card-container.flipped {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  width: 100%;
  min-height: 280px;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius-xl);
  padding: 28px 28px 24px;
  display: flex;
  flex-direction: column;
}

.card-front {
  background: linear-gradient(145deg, rgba(20, 29, 50, 0.95), rgba(10, 16, 32, 0.95));
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255,255,255,0.06);
}

.card-back {
  background: linear-gradient(145deg, rgba(10, 28, 42, 0.97), rgba(6, 18, 30, 0.97));
  border: 1px solid rgba(0, 212, 255, 0.2);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-lg), 0 0 32px rgba(0, 212, 255, 0.08), inset 0 1px 0 rgba(0,212,255,0.08);
  transform: rotateY(180deg);
}

.card-subject-tag {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.card-back-tag {
  color: var(--accent-cyan);
  opacity: 0.7;
}

.card-question {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.4;
  color: var(--text-primary);
  flex: 1;
}

.card-answer {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-primary);
  flex: 1;
}

.tap-hint {
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--glass-border);
}

.higher-badge {
  display: inline-block;
  margin-top: 14px;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  background: rgba(255, 184, 0, 0.15);
  color: var(--accent-amber);
  border: 1px solid rgba(255, 184, 0, 0.25);
}

/* Rating area */
.rating-area {
  animation: fadeInUp 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.rating-label {
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.rating-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.rating-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 12px 8px;
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  cursor: pointer;
  transition: all 0.2s;
  color: var(--text-primary);
}

.rating-btn:hover { transform: translateY(-2px); }
.rating-btn:active { transform: translateY(0); }

.rating-icon { font-size: 16px; font-weight: 700; }
.rating-name { font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.3px; }
.rating-interval { font-size: 9px; color: var(--text-muted); }

.rating-again { border-color: rgba(239, 68, 68, 0.35); }
.rating-again .rating-icon { color: var(--rating-again); }
.rating-again:hover { background: rgba(239, 68, 68, 0.12); box-shadow: 0 4px 16px rgba(239,68,68,0.2); }

.rating-hard { border-color: rgba(249, 115, 22, 0.35); }
.rating-hard .rating-icon { color: var(--rating-hard); }
.rating-hard:hover { background: rgba(249, 115, 22, 0.12); box-shadow: 0 4px 16px rgba(249,115,22,0.2); }

.rating-good { border-color: rgba(34, 197, 94, 0.35); }
.rating-good .rating-icon { color: var(--rating-good); }
.rating-good:hover { background: rgba(34, 197, 94, 0.12); box-shadow: 0 4px 16px rgba(34,197,94,0.2); }

.rating-easy { border-color: rgba(0, 212, 255, 0.35); }
.rating-easy .rating-icon { color: var(--rating-easy); }
.rating-easy:hover { background: rgba(0, 212, 255, 0.12); box-shadow: 0 4px 16px rgba(0,212,255,0.2); }

/* ============================================================ SUMMARY */
.summary-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 20px 0;
}

.summary-icon {
  font-size: 60px;
  margin-bottom: 16px;
  animation: popIn 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes popIn {
  from { transform: scale(0.5); opacity: 0; }
  to   { transform: scale(1); opacity: 1; }
}

.summary-title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 26px;
  margin-bottom: 8px;
}

.summary-sub {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 32px;
}

.summary-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  width: 100%;
  margin-bottom: 32px;
}

.sum-stat {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 16px 12px;
}

.sum-stat-val {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 26px;
  color: var(--accent-cyan);
  margin-bottom: 4px;
}

.sum-stat-label {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.summary-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
}

.btn-primary {
  width: 100%;
  padding: 16px;
  border-radius: var(--radius-md);
  border: none;
  background: linear-gradient(135deg, var(--accent-cyan), #0099bb);
  color: #000;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 4px 20px rgba(0,212,255,0.3);
}

.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 24px rgba(0,212,255,0.4); }

.btn-secondary {
  width: 100%;
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-secondary);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-secondary:hover { background: var(--glass-hover); color: var(--text-primary); }

/* ============================================================ STATS SCREEN */
.stats-hero-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 24px;
}

.stat-hero-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 16px 12px;
  text-align: center;
  transition: all 0.2s;
}

.stat-hero-card:hover { background: var(--glass-hover); }

.stat-hero-icon { font-size: 22px; margin-bottom: 8px; }

.stat-hero-val {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 26px;
  color: var(--accent-cyan);
  margin-bottom: 4px;
  line-height: 1;
}

.streak-card .stat-hero-val { color: var(--accent-amber); }
.mastered-card .stat-hero-val { color: var(--accent-green); }

.stat-hero-label {
  font-size: 10px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stats-section {
  margin-bottom: 28px;
}

.stats-section-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  margin-bottom: 14px;
}

/* Heatmap */
.heatmap-container {
  display: grid;
  grid-template-columns: repeat(30, 1fr);
  gap: 3px;
  padding: 12px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  margin-bottom: 8px;
}

.heatmap-day {
  aspect-ratio: 1;
  border-radius: 2px;
  background: var(--glass-border);
  transition: all 0.2s;
  cursor: default;
  position: relative;
}

.heatmap-day:hover::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  background: #1a2540;
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  font-size: 10px;
  padding: 4px 8px;
  border-radius: 6px;
  white-space: nowrap;
  z-index: 10;
  pointer-events: none;
}

.heatmap-level-0 { background: var(--glass-border); }
.heatmap-level-1 { background: #0d4a3e; }
.heatmap-level-2 { background: #0f7a64; }
.heatmap-level-3 { background: #00c896; }
.heatmap-level-4 { background: #00ffc3; }

.heatmap-legend {
  display: flex;
  align-items: center;
  gap: 5px;
  justify-content: flex-end;
  font-size: 10px;
  color: var(--text-muted);
}

.heatmap-swatch {
  width: 10px;
  height: 10px;
  border-radius: 2px;
}

/* Subject mastery */
.subject-mastery-item {
  margin-bottom: 16px;
}

.smi-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 7px;
}

.smi-name {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 14px;
}

.smi-pct {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 13px;
}

.smi-bar {
  height: 6px;
  background: rgba(255,255,255,0.06);
  border-radius: 6px;
  overflow: hidden;
}

.smi-fill {
  height: 100%;
  border-radius: 6px;
  transition: width 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Card status grid */
.card-status-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.cs-item {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 14px 10px;
  text-align: center;
}

.cs-val {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 22px;
  margin-bottom: 4px;
}

.cs-label {
  font-size: 10px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.cs-new .cs-val { color: var(--text-muted); }
.cs-learning .cs-val { color: var(--accent-amber); }
.cs-mastered .cs-val { color: var(--accent-green); }
.cs-due .cs-val { color: #ef4444; }

/* ============================================================ LOADING */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-deep);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  z-index: 1000;
  transition: opacity 0.4s;
}

.loading-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--glass-border);
  border-top-color: var(--accent-cyan);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-text {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}

/* ============================================================ TOAST */
.toast-container {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 500;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  pointer-events: none;
}

.toast {
  padding: 10px 20px;
  background: rgba(20, 29, 50, 0.95);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  backdrop-filter: blur(12px);
  animation: toastIn 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  box-shadow: var(--shadow-md);
  white-space: nowrap;
}

.toast.toast-success { border-color: rgba(34, 197, 94, 0.3); color: var(--accent-green); }
.toast.toast-info { border-color: rgba(0, 212, 255, 0.3); color: var(--accent-cyan); }
.toast.toast-out { animation: toastOut 0.3s forwards; }

@keyframes toastIn {
  from { opacity: 0; transform: translateY(10px) scale(0.95); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes toastOut {
  to { opacity: 0; transform: translateY(-10px) scale(0.95); }
}

/* ============================================================ SCROLLBAR */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 4px; }

/* ============================================================ RESPONSIVE */
@media (max-width: 400px) {
  .hero-title { font-size: 24px; }
  .rating-buttons { grid-template-columns: repeat(2, 1fr); }
  .stats-hero-row { grid-template-columns: repeat(3, 1fr); gap: 8px; }
  .stat-hero-val { font-size: 22px; }
  .heatmap-container { grid-template-columns: repeat(20, 1fr); }
}

/* Shimmer loading animation for skeleton states */
@keyframes shimmer {
  0%   { background-position: -200% center; }
  100% { background-position:  200% center; }
}

.skeleton {
  background: linear-gradient(90deg, var(--glass-bg) 25%, var(--glass-hover) 50%, var(--glass-bg) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 6px;
}

/* ============================================================
   QUIZ MODE STYLES
   ============================================================ */

/* Quick stats - 4-column when quiz accuracy present */
.quick-stats {
  grid-template-columns: repeat(4, 1fr);
}

.qstat-quiz .qstat-val {
  color: var(--accent-amber);
}

/* ---- Quiz Card (question display) ---- */
.quiz-card {
  background: linear-gradient(145deg, rgba(20, 29, 50, 0.95), rgba(10, 16, 32, 0.95));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 24px 24px 20px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255,255,255,0.06);
}

.quiz-subject-tag {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.quiz-question {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.4;
  color: var(--text-primary);
}

.quiz-higher-badge {
  display: inline-block;
  margin-top: 12px;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  background: rgba(255, 184, 0, 0.15);
  color: var(--accent-amber);
  border: 1px solid rgba(255, 184, 0, 0.25);
}

/* ---- Score bar ---- */
.quiz-score-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  padding: 0 2px;
}

.quiz-score-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-muted);
  font-weight: 600;
}

.quiz-score-val {
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-cyan);
}

/* ---- MCQ Options ---- */
.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 14px;
}

.quiz-option-btn {
  width: 100%;
  text-align: left;
  padding: 16px 18px;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.45;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  animation: optionIn 0.3s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.quiz-option-btn:nth-child(1) { animation-delay: 0.03s; }
.quiz-option-btn:nth-child(2) { animation-delay: 0.06s; }
.quiz-option-btn:nth-child(3) { animation-delay: 0.09s; }
.quiz-option-btn:nth-child(4) { animation-delay: 0.12s; }

@keyframes optionIn {
  from { opacity: 0; transform: translateX(-8px); }
  to   { opacity: 1; transform: translateX(0); }
}

.quiz-option-btn:hover:not(:disabled) {
  background: rgba(255,255,255,0.07);
  border-color: rgba(0, 212, 255, 0.35);
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.12), inset 0 0 0 1px rgba(0,212,255,0.05);
  transform: translateX(2px);
}

.quiz-option-btn:active:not(:disabled) {
  transform: translateX(1px);
}

.quiz-option-btn:disabled {
  cursor: default;
}

/* Option letter badge */
.quiz-option-letter {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.1);
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  flex-shrink: 0;
  margin-top: 1px;
  transition: all 0.2s;
  font-family: var(--font-heading);
}

.quiz-option-text {
  flex: 1;
}

/* Correct answer state */
.quiz-option-btn.correct {
  background: rgba(34, 197, 94, 0.12);
  border-color: rgba(34, 197, 94, 0.6);
  box-shadow: 0 0 20px rgba(34, 197, 94, 0.2), inset 0 0 0 1px rgba(34,197,94,0.1);
  animation: correctPulse 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.quiz-option-btn.correct .quiz-option-letter {
  background: rgba(34, 197, 94, 0.3);
  border-color: rgba(34, 197, 94, 0.7);
  color: #22c55e;
}

.quiz-option-btn.correct .quiz-option-text {
  color: #22c55e;
  font-weight: 500;
}

@keyframes correctPulse {
  0%   { transform: scale(1); }
  40%  { transform: scale(1.015); }
  100% { transform: scale(1); }
}

/* Wrong answer state */
.quiz-option-btn.wrong {
  background: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.55);
  box-shadow: 0 0 16px rgba(239, 68, 68, 0.15), inset 0 0 0 1px rgba(239,68,68,0.08);
  animation: wrongShake 0.45s cubic-bezier(0.36, 0.07, 0.19, 0.97) forwards;
}

.quiz-option-btn.wrong .quiz-option-letter {
  background: rgba(239, 68, 68, 0.25);
  border-color: rgba(239, 68, 68, 0.6);
  color: #ef4444;
}

.quiz-option-btn.wrong .quiz-option-text {
  color: #ef4444;
}

@keyframes wrongShake {
  0%, 100% { transform: translateX(0); }
  15%  { transform: translateX(-6px); }
  30%  { transform: translateX(5px); }
  45%  { transform: translateX(-4px); }
  60%  { transform: translateX(3px); }
  75%  { transform: translateX(-2px); }
}

/* Correct answer highlight when another was selected wrong */
.quiz-option-btn.correct-reveal {
  background: rgba(34, 197, 94, 0.08);
  border-color: rgba(34, 197, 94, 0.5);
  box-shadow: 0 0 16px rgba(34, 197, 94, 0.15);
}

.quiz-option-btn.correct-reveal .quiz-option-letter {
  background: rgba(34, 197, 94, 0.2);
  border-color: rgba(34, 197, 94, 0.5);
  color: #22c55e;
}

.quiz-option-btn.correct-reveal .quiz-option-text {
  color: #22c55e;
}

/* Dimmed (other options when answer locked) */
.quiz-option-btn.dimmed {
  opacity: 0.38;
}

/* ---- Misconception Feedback Box ---- */
.quiz-feedback-box {
  background: rgba(255, 184, 0, 0.08);
  border: 1px solid rgba(255, 184, 0, 0.3);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 14px;
  animation: fadeInUp 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.quiz-feedback-icon {
  font-size: 16px;
  color: var(--accent-amber);
  flex-shrink: 0;
  line-height: 1.4;
}

.quiz-feedback-text {
  font-size: 13px;
  line-height: 1.55;
  color: var(--accent-amber);
}

.quiz-feedback-text strong {
  font-weight: 700;
  display: block;
  margin-bottom: 2px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  opacity: 0.75;
}

/* ---- Continue Button ---- */
.quiz-continue-btn {
  width: 100%;
  padding: 15px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255,255,255,0.15);
  background: var(--glass-bg);
  color: var(--text-primary);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  animation: fadeInUp 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.quiz-continue-btn:hover {
  background: var(--glass-hover);
  border-color: rgba(255,255,255,0.22);
  transform: translateY(-1px);
}

/* ---- Correct celebration ---- */
@keyframes celebratePop {
  0%   { transform: scale(1); }
  30%  { transform: scale(1.3); }
  60%  { transform: scale(0.9); }
  100% { transform: scale(1); }
}

.quiz-celebrate {
  animation: celebratePop 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* ---- Mode Picker Modal ---- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 200;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  animation: overlayIn 0.25s ease forwards;
}

@keyframes overlayIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.mode-picker-modal {
  width: 100%;
  max-width: var(--max-width);
  background: var(--bg-elevated);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  padding: 28px 24px 40px;
  animation: sheetUp 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes sheetUp {
  from { transform: translateY(100%); opacity: 0; }
  to   { transform: translateY(0); opacity: 1; }
}

.mode-picker-title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 20px;
  text-align: center;
  margin-bottom: 6px;
}

.mode-picker-sub {
  font-size: 13px;
  color: var(--text-muted);
  text-align: center;
  margin-bottom: 24px;
}

.mode-picker-options {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 16px;
}

.mode-option-btn {
  width: 100%;
  text-align: left;
  padding: 18px 20px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--text-primary);
}

.mode-option-btn:hover {
  background: var(--glass-hover);
  border-color: rgba(255,255,255,0.15);
  transform: translateX(2px);
}

.mode-flashcard-btn:hover {
  border-color: rgba(0, 212, 255, 0.4);
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.1);
}

.mode-quiz-btn:hover {
  border-color: rgba(255, 184, 0, 0.4);
  box-shadow: 0 4px 20px rgba(255, 184, 0, 0.1);
}

.mode-option-icon {
  font-size: 28px;
  flex-shrink: 0;
}

.mode-option-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 16px;
  margin-bottom: 3px;
}

.mode-option-desc {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.4;
}

.mode-picker-cancel {
  width: 100%;
  padding: 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
}

.mode-picker-cancel:hover {
  background: var(--glass-bg);
  color: var(--text-secondary);
}

/* ---- Quiz Mode Badge ---- */
.study-mode-badge.quiz-mode {
  background: rgba(255, 184, 0, 0.2);
  color: var(--accent-amber);
}

/* ---- Quiz Wrong Cards (summary screen) ---- */
.wrong-cards-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.7px;
  color: var(--text-muted);
  margin-bottom: 12px;
  margin-top: 4px;
  width: 100%;
  text-align: left;
}

.wrong-cards-list {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
  max-height: 320px;
  overflow-y: auto;
}

.wrong-card-item {
  background: rgba(239, 68, 68, 0.06);
  border: 1px solid rgba(239, 68, 68, 0.2);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  text-align: left;
}

.wrong-card-q {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
  line-height: 1.4;
}

.wrong-card-misconception {
  font-size: 12px;
  color: var(--accent-amber);
  line-height: 1.45;
  opacity: 0.85;
}

/* ---- Stats hero row with 4 cards ---- */
.stats-hero-row {
  grid-template-columns: repeat(2, 1fr);
}

.quiz-accuracy-card .stat-hero-val {
  color: var(--accent-amber);
}

/* ---- Responsive ---- */
@media (min-width: 400px) {
  .stats-hero-row {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (max-width: 400px) {
  .quick-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .quiz-option-btn {
    padding: 13px 14px;
    font-size: 13px;
  }
}

/* ============================================================
   EXAM BOARD SELECTOR
   Pill-style toggle bar above subject grid
   ============================================================ */

.board-selector {
  display: flex;
  gap: 8px;
  margin: 0 0 16px 0;
  flex-wrap: wrap;
}

.board-pill {
  padding: 7px 20px;
  border-radius: 999px;
  border: 1.5px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-secondary);
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.18s ease;
  letter-spacing: 0.02em;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.board-pill:hover {
  background: var(--glass-hover);
  border-color: rgba(255,255,255,0.16);
  color: var(--text-primary);
}

.board-pill.active {
  background: rgba(0, 212, 255, 0.12);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.2);
}

/* ============================================================
   TIER SELECTOR — Foundation / Higher pills (amber accent)
   ============================================================ */

.tier-selector {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px 0;
  flex-wrap: wrap;
}

.tier-label {
  font-family: var(--font-heading);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-right: 2px;
}

.tier-pill {
  padding: 7px 20px;
  border-radius: 999px;
  border: 1.5px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-secondary);
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.18s ease;
  letter-spacing: 0.02em;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.tier-pill:hover {
  background: var(--glass-hover);
  border-color: rgba(255,255,255,0.16);
  color: var(--text-primary);
}

.tier-pill.active {
  background: rgba(255, 184, 0, 0.12);
  border-color: #ffb800;
  color: #ffb800;
  box-shadow: 0 0 12px rgba(255, 184, 0, 0.2);
}

/* ============================================================
   SUBJECT CARD — keep 1-column stacked layout for all subjects
   ============================================================ */

/* ============================================================
   NAV AUTH ADDITIONS
   ============================================================ */

/* PRO badge in navbar */
.nav-pro-btn {
  background: linear-gradient(135deg, #00d4ff22 0%, #00d4ff11 100%);
  border: 1px solid rgba(0,212,255,0.35) !important;
  border-radius: 8px !important;
  padding: 4px 10px !important;
  height: 44px !important;
  width: auto !important;
  color: var(--accent-cyan) !important;
  cursor: pointer;
  transition: all 0.2s;
  min-width: 44px;
  /* FIX 10: match nav-btn style */
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
}

.nav-pro-btn:hover {
  background: linear-gradient(135deg, #00d4ff33 0%, #00d4ff1a 100%);
  box-shadow: 0 0 12px rgba(0,212,255,0.25);
}

.pro-badge-text {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 10px;
  letter-spacing: 1px;
}

/* Sign In button */
.nav-signin-btn {
  background: linear-gradient(135deg, var(--accent-cyan) 0%, #0099ff 100%);
  color: #080e1c;
  border: none;
  border-radius: 8px;
  padding: 6px 14px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.nav-signin-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(0,212,255,0.4);
}

/* User avatar menu */
.nav-user-menu {
  position: relative;
  display: flex;
  align-items: center;
}

.user-avatar-btn {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-cyan) 0%, #0099ff 100%);
  border: 2px solid rgba(0,212,255,0.4);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  flex-shrink: 0;
}

.user-avatar-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 0 16px rgba(0,212,255,0.4);
}

.user-initials {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 12px;
  color: #080e1c;
  letter-spacing: 0.5px;
}

/* User dropdown */
.user-dropdown {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  min-width: 200px;
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 200;
  padding: 12px 0 8px;
  animation: dropdownIn 0.15s ease;
}

@keyframes dropdownIn {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.user-dropdown-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 14px;
  color: var(--text-primary);
  padding: 0 16px 2px;
}

.user-dropdown-email {
  font-size: 11px;
  color: var(--text-muted);
  padding: 0 16px 8px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-dropdown-plan {
  padding: 0 16px 10px;
}

.plan-badge {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 10px;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 6px;
}

.plan-free {
  background: rgba(255,255,255,0.08);
  color: var(--text-secondary);
  border: 1px solid var(--glass-border);
}

.plan-pro {
  background: linear-gradient(135deg, rgba(0,212,255,0.2), rgba(0,153,255,0.2));
  color: var(--accent-cyan);
  border: 1px solid rgba(0,212,255,0.3);
}

.user-dropdown-divider {
  height: 1px;
  background: var(--glass-border);
  margin: 4px 0;
}

.user-dropdown-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 13px;
  font-family: var(--font-body);
  padding: 8px 16px;
  cursor: pointer;
  text-align: left;
  transition: all 0.15s;
}

.user-dropdown-item:hover {
  background: var(--glass-hover);
  color: var(--text-primary);
}

.user-dropdown-logout {
  color: #ef4444 !important;
}

.user-dropdown-logout:hover {
  background: rgba(239,68,68,0.08) !important;
}

/* ============================================================
   AUTH SCREEN
   ============================================================ */

#screen-auth {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--nav-height));
  padding: 24px 20px;
}

.auth-container {
  width: 100%;
  max-width: 380px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.auth-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.auth-logo-text {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 22px;
  letter-spacing: -0.4px;
  background: linear-gradient(135deg, #fff 0%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.auth-card {
  width: 100%;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 28px 24px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.auth-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 20px;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.auth-sub {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.auth-error {
  background: rgba(239,68,68,0.1);
  border: 1px solid rgba(239,68,68,0.3);
  border-radius: var(--radius-sm);
  color: #ef4444;
  font-size: 13px;
  padding: 10px 14px;
  margin-bottom: 16px;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.auth-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.auth-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.3px;
}

.auth-input {
  background: rgba(8,14,28,0.7);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 14px;
  padding: 10px 14px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  width: 100%;
}

.auth-input::placeholder {
  color: var(--text-muted);
}

.auth-input:focus {
  border-color: rgba(0,212,255,0.5);
  box-shadow: 0 0 0 3px rgba(0,212,255,0.1);
}

.auth-submit-btn {
  background: linear-gradient(135deg, var(--accent-cyan) 0%, #0099ff 100%);
  color: #080e1c;
  border: none;
  border-radius: var(--radius-sm);
  padding: 12px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 4px;
}

.auth-submit-btn:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(0,212,255,0.4);
}

.auth-submit-btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.auth-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(8,14,28,0.3);
  border-top-color: #080e1c;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.auth-toggle {
  margin-top: 16px;
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}

.auth-toggle-btn {
  background: none;
  border: none;
  color: var(--accent-cyan);
  font-size: 13px;
  cursor: pointer;
  font-family: var(--font-body);
  padding: 0;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.auth-toggle-btn:hover {
  color: #fff;
}

.auth-skip-btn {
  display: block;
  margin: 14px auto 0;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 12px;
  cursor: pointer;
  font-family: var(--font-body);
  text-align: center;
  padding: 4px 8px;
  transition: color 0.2s;
}

.auth-skip-btn:hover {
  color: var(--text-secondary);
}

/* Auth tabs */
.auth-tabs {
  display: flex;
  width: 100%;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 4px;
  gap: 4px;
}

.auth-tab {
  flex: 1;
  padding: 9px;
  background: none;
  border: none;
  border-radius: 6px;
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.auth-tab.auth-tab-active {
  background: rgba(0,212,255,0.15);
  color: var(--accent-cyan);
  font-weight: 600;
}

.auth-tab:hover:not(.auth-tab-active) {
  color: var(--text-primary);
}

/* Auth divider */
.auth-divider {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-muted);
  font-size: 12px;
}

.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--glass-border);
}

/* Google sign-in button */
.auth-google-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 11px 14px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.auth-google-btn:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.2);
}

/* Forgot password link */
.auth-forgot-row {
  display: flex;
  justify-content: flex-end;
  margin-top: -6px;
}

.auth-forgot-btn {
  background: none;
  border: none;
  color: var(--accent-cyan);
  font-size: 12px;
  cursor: pointer;
  font-family: var(--font-body);
  padding: 0;
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color 0.2s;
}

.auth-forgot-btn:hover {
  color: #fff;
}

/* Auth success message */
.auth-success {
  background: rgba(34,197,94,0.1);
  border: 1px solid rgba(34,197,94,0.3);
  border-radius: var(--radius-sm);
  color: #22c55e;
  font-size: 13px;
  padding: 10px 14px;
  margin-bottom: 16px;
}


#screen-pricing {
  padding: 0 20px 40px;
  max-width: 600px;
  margin: 0 auto;
}

.pricing-container {
  position: relative;
  padding-top: 20px;
}

.pricing-back-btn {
  position: absolute;
  top: 20px;
  left: 0;
  z-index: 1;
}

.pricing-header {
  text-align: center;
  padding: 20px 0 28px;
}

.pricing-title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 26px;
  letter-spacing: -0.5px;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.pricing-sub {
  font-size: 14px;
  color: var(--text-muted);
}

.pricing-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
}

@media (max-width: 420px) {
  .pricing-cards {
    grid-template-columns: 1fr;
  }
}

/* Base pricing card */
.pricing-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 22px 18px;
  position: relative;
  overflow: hidden;
  transition: transform 0.2s;
}

.pricing-card:hover {
  transform: translateY(-2px);
}

/* Pro card special styling */
.pricing-pro-card {
  border-color: rgba(0,212,255,0.4);
  background: rgba(0,212,255,0.03);
}

.pricing-pro-glow {
  position: absolute;
  top: -60px;
  right: -60px;
  width: 180px;
  height: 180px;
  background: radial-gradient(circle, rgba(0,212,255,0.15) 0%, transparent 70%);
  pointer-events: none;
}

.pricing-card-header {
  margin-bottom: 18px;
}

.pricing-tier-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 14px;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.pricing-pro-badge {
  background: linear-gradient(135deg, var(--accent-cyan), #0099ff);
  color: #080e1c;
  font-size: 8px;
  font-weight: 800;
  letter-spacing: 1px;
  padding: 2px 6px;
  border-radius: 4px;
}

.pricing-price {
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.pricing-amount {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 32px;
  color: var(--text-primary);
  letter-spacing: -1px;
}

.pricing-pro-amount {
  background: linear-gradient(135deg, var(--accent-cyan) 0%, #0099ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.pricing-period {
  font-size: 13px;
  color: var(--text-muted);
}

.pricing-yearly-note {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Feature list */
.pricing-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}

.pf-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 12px;
  line-height: 1.4;
}

.pf-yes {
  color: var(--text-secondary);
}

.pf-no {
  color: var(--text-muted);
  opacity: 0.6;
}

.pf-coming {
  color: var(--text-muted);
}

.pf-icon {
  font-size: 13px;
  flex-shrink: 0;
  margin-top: 0px;
  font-weight: 700;
}

.pf-yes .pf-icon {
  color: var(--accent-green);
}

.pf-no .pf-icon {
  color: rgba(239,68,68,0.6);
}

.pf-pro-icon {
  color: var(--accent-cyan) !important;
}

.pf-coming .pf-icon {
  color: var(--accent-amber);
}

/* CTA buttons */
.pricing-cta {
  width: 100%;
  padding: 11px;
  border-radius: var(--radius-md);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
}

.pricing-free-cta {
  background: var(--glass-hover);
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
}

.pricing-free-cta:hover {
  background: rgba(255,255,255,0.09);
  color: var(--text-primary);
}

.pricing-pro-cta {
  background: linear-gradient(135deg, var(--accent-cyan) 0%, #0099ff 100%);
  color: #080e1c;
}

.pricing-pro-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 24px rgba(0,212,255,0.4);
}

.pricing-trial-note {
  font-size: 10px;
  color: var(--text-muted);
  text-align: center;
  margin-top: 8px;
}

/* Logged-in / guest notes */
.pricing-logged-in-note,
.pricing-guest-note {
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
  padding: 10px 16px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  flex-wrap: wrap;
}

.pricing-guest-note a {
  color: var(--accent-cyan);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ============================================================
   UPGRADE MODAL
   ============================================================ */

.upgrade-modal {
  background: var(--bg-card);
  border: 1px solid rgba(0,212,255,0.25);
  border-radius: var(--radius-xl);
  padding: 28px 24px;
  width: 90%;
  max-width: 340px;
  position: relative;
  text-align: center;
  box-shadow: 0 0 40px rgba(0,212,255,0.12), var(--shadow-lg);
  animation: modalPop 0.2s cubic-bezier(0.34,1.56,0.64,1);
}

@keyframes modalPop {
  from { opacity: 0; transform: scale(0.88); }
  to   { opacity: 1; transform: scale(1); }
}

.upgrade-modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.upgrade-modal-close:hover {
  background: var(--glass-hover);
  color: var(--text-primary);
}

.upgrade-modal-icon {
  font-size: 36px;
  margin-bottom: 12px;
  filter: drop-shadow(0 0 12px rgba(0,212,255,0.4));
}

.upgrade-modal-title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 20px;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.upgrade-modal-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
  line-height: 1.5;
}

.upgrade-modal-perks {
  list-style: none;
  text-align: left;
  background: rgba(0,212,255,0.04);
  border: 1px solid rgba(0,212,255,0.1);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  margin-bottom: 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.upgrade-modal-perks li {
  font-size: 13px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.upm-check {
  color: var(--accent-cyan);
  font-weight: 700;
  flex-shrink: 0;
}

.upgrade-modal-cta {
  width: 100%;
  padding: 12px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--accent-cyan) 0%, #0099ff 100%);
  color: #080e1c;
  border: none;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 10px;
}

.upgrade-modal-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 24px rgba(0,212,255,0.45);
}

.upgrade-modal-note {
  font-size: 11px;
  color: var(--text-muted);
}

/* ============================================================
   SUBJECT CARD — locked state
   ============================================================ */

.subject-card-locked {
  position: relative;
  opacity: 0.65;
  cursor: pointer;
}

.subject-lock-overlay {
  position: absolute;
  top: 8px;
  right: 8px;
  background: rgba(0,212,255,0.12);
  border: 1px solid rgba(0,212,255,0.3);
  border-radius: 8px;
  padding: 3px 8px;
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--accent-cyan);
  font-size: 10px;
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: 0.5px;
  z-index: 2;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}


/* ============================================================
   REVISEKIT V4 — NEW STYLES
   Learn Mode, Lesson Reader, Stripe, Privacy/Terms, Footer
   ============================================================ */

/* ── Learn Screen ─────────────────────────────────────────── */
.learn-progress-banner {
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 12px;
  padding: 12px 16px;
  margin: 0 16px 16px;
  font-size: 14px;
  color: var(--text-muted);
}
.learn-progress-icon { font-size: 18px; }

.lessons-list {
  padding: 0 16px 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.lessons-empty {
  text-align: center;
  color: var(--text-muted);
  padding: 40px 20px;
  font-size: 15px;
}

.lesson-group { margin-bottom: 8px; }

.lesson-group-header {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 12px 4px 6px;
}

.lesson-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--card-bg);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 14px 16px;
  cursor: pointer;
  transition: all 0.2s ease;
  gap: 12px;
}
.lesson-item:hover {
  border-color: rgba(0, 212, 255, 0.3);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}
.lesson-item.lesson-completed {
  border-color: rgba(34, 197, 94, 0.25);
  background: rgba(34, 197, 94, 0.05);
}

.lesson-item-left {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
  min-width: 0;
}

.lesson-check {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid var(--glass-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
  color: transparent;
  transition: all 0.25s ease;
}
.lesson-check-done {
  background: var(--subject-color, #22c55e);
  border-color: var(--subject-color, #22c55e);
  color: #fff;
}

.lesson-item-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.lesson-item-meta {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

.lesson-item-arrow {
  color: var(--text-muted);
  flex-shrink: 0;
}

/* ── Lesson Reader ─────────────────────────────────────────── */
#screen-lesson {
  overflow-y: auto;
  background: var(--bg-dark);
}

.lesson-header {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 16px 12px;
  position: sticky;
  top: 0;
  background: var(--bg-dark);
  border-bottom: 1px solid var(--glass-border);
  z-index: 10;
}
.lesson-header-meta {
  flex: 1;
  min-width: 0;
}
.lesson-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  line-height: 1.3;
}
.lesson-duration-badge {
  display: inline-block;
  background: rgba(0, 212, 255, 0.12);
  color: var(--accent-cyan);
  border-radius: 20px;
  padding: 2px 10px;
  font-size: 11px;
  font-weight: 600;
  margin-top: 4px;
  border: 1px solid rgba(0, 212, 255, 0.2);
}

.lesson-content-wrap {
  max-width: 700px;
  margin: 0 auto;
  padding: 24px 20px 80px;
}

/* Lesson HTML content styles */
.lesson-content h3 {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 24px 0 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--glass-border);
}
.lesson-content h3:first-child { margin-top: 0; }
.lesson-content p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-secondary);
  margin: 0 0 12px;
}
.lesson-content ul, .lesson-content ol {
  margin: 0 0 14px;
  padding-left: 20px;
}
.lesson-content li {
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: 5px;
}
.lesson-content strong { color: var(--text-primary); }
.lesson-content em { color: var(--accent-cyan); font-style: italic; }

/* Exam Tip styling */
.lesson-content p.exam-tip,
.lesson-content .exam-tip {
  background: rgba(255, 184, 0, 0.1);
  border-left: 3px solid var(--accent-amber);
  border-radius: 0 10px 10px 0;
  padding: 12px 16px;
  color: #f5cc60;
  font-size: 14px;
  line-height: 1.6;
  margin: 16px 0;
}

/* Key Terms */
.lesson-key-terms {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--glass-border);
}
.key-terms-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 10px;
}
.key-terms-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.key-term-pill {
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.2);
  color: var(--accent-cyan);
  border-radius: 20px;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 500;
}

/* Lesson actions */
.lesson-actions {
  margin-top: 28px;
  display: flex;
  justify-content: center;
}

.btn-lesson-complete {
  display: flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, #22c55e, #16a34a);
  color: #fff;
  border: none;
  border-radius: 14px;
  padding: 14px 28px;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.25s ease;
  box-shadow: 0 4px 20px rgba(34, 197, 94, 0.3);
}
.btn-lesson-complete:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(34, 197, 94, 0.4);
}
.btn-lesson-complete.lesson-already-complete {
  background: rgba(34, 197, 94, 0.15);
  border: 1px solid rgba(34, 197, 94, 0.3);
  color: #22c55e;
  box-shadow: none;
  cursor: default;
}

/* ── Mode Picker: Learn button ─────────────────────────────── */
.mode-learn-btn {
  background: linear-gradient(135deg, rgba(0,212,255,0.08), rgba(0,212,255,0.04));
  border-color: rgba(0, 212, 255, 0.25) !important;
}
.mode-learn-btn:hover {
  border-color: rgba(0, 212, 255, 0.5) !important;
  background: rgba(0, 212, 255, 0.12) !important;
}

/* ── Stripe Pricing Buttons ─────────────────────────────────── */
.stripe-pricing-btns {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 4px;
}

.pricing-pro-annual-cta {
  background: rgba(255, 184, 0, 0.12) !important;
  border: 1px solid rgba(255, 184, 0, 0.3) !important;
  color: var(--accent-amber) !important;
}
.pricing-pro-annual-cta:hover {
  background: rgba(255, 184, 0, 0.2) !important;
  border-color: rgba(255, 184, 0, 0.5) !important;
}
.save-badge {
  display: inline-block;
  background: var(--accent-amber);
  color: #1a1a1a;
  font-size: 10px;
  font-weight: 800;
  border-radius: 4px;
  padding: 2px 5px;
  margin-left: 4px;
  vertical-align: middle;
}

/* ── Stripe Setup Modal ─────────────────────────────────────── */
.stripe-setup-modal {
  text-align: left !important;
  padding: 28px !important;
}
.stripe-setup-steps {
  list-style: decimal;
  padding-left: 20px;
  margin: 12px 0 16px;
  text-align: left;
}
.stripe-setup-steps li {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 8px;
  line-height: 1.5;
}
.stripe-setup-steps strong { color: var(--text-primary); }
.stripe-setup-steps code {
  background: rgba(0,212,255,0.1);
  border: 1px solid rgba(0,212,255,0.2);
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 12px;
  color: var(--accent-cyan);
  font-family: 'Courier New', monospace;
}
.stripe-setup-note {
  font-size: 13px;
  color: var(--text-muted);
  margin: 0 0 16px;
  text-align: left;
}

/* ── Footer ──────────────────────────────────────────────────── */
.app-footer {
  background: var(--card-bg);
  border-top: 1px solid var(--glass-border);
  padding: 14px 20px;
  margin-top: 8px;
}
.footer-inner {
  max-width: 480px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}
.footer-brand {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-muted);
  font-family: 'Plus Jakarta Sans', sans-serif;
}
.footer-links {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.footer-link {
  background: none;
  border: none;
  font-size: 12px;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0;
  text-decoration: none;
  transition: color 0.2s;
  font-family: 'Inter', sans-serif;
}
.footer-link:hover { color: var(--accent-cyan); }

/* ── Legal Screens ──────────────────────────────────────────── */
.legal-content {
  max-width: 700px;
  margin: 0 auto;
  padding: 20px 20px 60px;
}
.legal-intro {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
  padding: 14px 16px;
  background: rgba(0,212,255,0.06);
  border-left: 3px solid var(--accent-cyan);
  border-radius: 0 10px 10px 0;
}
.legal-h3 {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 28px 0 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--glass-border);
}
.legal-content p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 0 0 14px;
}
.legal-list {
  margin: 0 0 14px;
  padding-left: 20px;
}
.legal-list li {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 6px;
}
.legal-link {
  color: var(--accent-cyan);
  text-decoration: none;
}
.legal-link:hover { text-decoration: underline; }

/* ── Home Screen: wider cards for new subjects ─────────────── */
.subject-card-wide-group {
  grid-column: 1 / -1;
}


/* ============================================================
   V5 STYLES — Exam Practice, SLOP Drills, How to Revise,
                 Bottom Nav, Skeletons, Micro-interactions,
                 Smooth Screen Transitions
   ============================================================ */

/* ============================================================
   UI IMPROVEMENT 1: SMOOTH SCREEN TRANSITIONS
   ============================================================ */

@keyframes screenSlideIn {
  from { opacity: 0; transform: translateX(28px); }
  to   { opacity: 1; transform: translateX(0); }
}
@keyframes screenSlideUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

.screen {
  animation: none;
}
.screen.active {
  animation: screenSlideIn 0.28s cubic-bezier(0.22, 0.61, 0.36, 1) both;
}
/* Home screen gets a fade-up feel */
#screen-home.active {
  animation: screenSlideUp 0.25s cubic-bezier(0.22, 0.61, 0.36, 1) both;
}

/* ============================================================
   UI IMPROVEMENT 2: BOTTOM NAVIGATION BAR
   ============================================================ */

.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 900;
  display: flex;
  align-items: center;
  justify-content: space-around;
  background: rgba(15, 23, 41, 0.96);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid rgba(255,255,255,0.07);
  padding: 8px 0 max(8px, env(safe-area-inset-bottom));
  max-width: 480px;
  margin: 0 auto;
}

.bottom-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  background: none;
  border: none;
  color: rgba(240,244,255,0.45);
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.3px;
  padding: 6px 16px;
  cursor: pointer;
  transition: color 0.18s ease, transform 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}
.bottom-nav-item svg {
  transition: transform 0.15s ease;
}
.bottom-nav-item.active {
  color: var(--accent-cyan);
}
.bottom-nav-item:active {
  transform: scale(0.92);
}
.bottom-nav-item.active svg {
  filter: drop-shadow(0 0 5px rgba(0,212,255,0.5));
}

/* Push content up on screens that show bottom nav */
#app {
  padding-bottom: 0;
}
body {
  padding-bottom: 80px; /* room for bottom nav */
}
/* Screens that hide bottom nav don't need the extra padding */
#screen-study, #screen-lesson, #screen-auth, #screen-pricing,
#screen-privacy, #screen-terms {
  padding-bottom: 24px;
}

/* ============================================================
   UI IMPROVEMENT 3: MODE PICKER BADGE STYLES
   ============================================================ */
/* Badge count text handled via JS, mode-option-desc updated */

/* ============================================================
   UI IMPROVEMENT 4: LOADING SKELETON
   ============================================================ */

.loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--bg-base);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  transition: opacity 0.4s ease;
}
.loading-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.loading-skeleton-screen {
  width: 100%;
  max-width: 480px;
  padding: 0;
}

@keyframes skelShimmer {
  0%   { background-position: -400px 0; }
  100% { background-position: 400px 0; }
}

.skel-navbar {
  height: 60px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--glass-border);
  margin-bottom: 24px;
}

.skel-hero {
  padding: 8px 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.skel-line {
  height: 14px;
  border-radius: 8px;
  background: linear-gradient(90deg, var(--bg-elevated) 25%, rgba(255,255,255,0.05) 50%, var(--bg-elevated) 75%);
  background-size: 800px 100%;
  animation: skelShimmer 1.6s infinite ease-in-out;
}
.skel-line-lg { width: 70%; height: 28px; }
.skel-line-sm { width: 45%; }

.skel-stats-row {
  display: flex;
  gap: 12px;
  padding: 0 20px;
  margin-bottom: 24px;
}
.skel-stat-box {
  flex: 1;
  height: 64px;
  border-radius: 12px;
  background: linear-gradient(90deg, var(--bg-elevated) 25%, rgba(255,255,255,0.05) 50%, var(--bg-elevated) 75%);
  background-size: 800px 100%;
  animation: skelShimmer 1.6s infinite ease-in-out;
}
.skel-stat-box:nth-child(2) { animation-delay: 0.1s; }
.skel-stat-box:nth-child(3) { animation-delay: 0.2s; }
.skel-stat-box:nth-child(4) { animation-delay: 0.3s; }

.skel-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  padding: 0 20px;
}
.skel-card {
  height: 120px;
  border-radius: 16px;
  background: linear-gradient(90deg, var(--bg-elevated) 25%, rgba(255,255,255,0.05) 50%, var(--bg-elevated) 75%);
  background-size: 800px 100%;
  animation: skelShimmer 1.6s infinite ease-in-out;
}
.skel-card:nth-child(2) { animation-delay: 0.1s; }
.skel-card:nth-child(3) { animation-delay: 0.2s; }
.skel-card:nth-child(4) { animation-delay: 0.3s; }

/* ============================================================
   UI IMPROVEMENT 5: MICRO-INTERACTION FEEDBACK
   ============================================================ */

/* All interactive buttons: scale on press + smooth hover */
button,
.subject-card,
.topic-card,
.mode-option-btn,
.rating-btn,
.board-pill,
.tier-pill,
.quiz-option,
.home-extra-btn,
.slop-drill-card,
.exam-question-card {
  transition: transform 0.12s ease, opacity 0.12s ease, box-shadow 0.2s ease !important;
}

button:active:not(:disabled),
.subject-card:active,
.topic-card:active,
.mode-option-btn:active,
.rating-btn:active,
.board-pill:active,
.tier-pill:active {
  transform: scale(0.97) !important;
}

.slop-drill-card:hover,
.home-extra-btn:hover,
.exam-question-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}

/* Smooth progress bars */
.study-progress-bar,
.slop-progress-bar {
  transition: width 0.35s cubic-bezier(0.4, 0, 0.2, 1) !important;
}

/* Card hover lift */
.subject-card:hover {
  transform: translateY(-2px) !important;
}

/* Mode picker button hover */
.mode-option-btn:hover {
  background: rgba(0, 212, 255, 0.06) !important;
  border-color: rgba(0, 212, 255, 0.25) !important;
}

/* ============================================================
   HOME EXTRAS (How to Revise button)
   ============================================================ */

.home-extras {
  padding: 0 20px 16px;
  margin-top: 8px;
}

.home-extra-btn {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 16px 18px;
  cursor: pointer;
  color: var(--text-primary);
  font-family: var(--font-body);
  text-align: left;
  transition: background 0.2s ease, border-color 0.2s ease !important;
}
.home-extra-btn:hover {
  background: var(--glass-hover) !important;
  border-color: rgba(0, 212, 255, 0.2) !important;
}

.home-extra-icon {
  font-size: 26px;
  flex-shrink: 0;
}

.home-extra-title {
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}
.home-extra-sub {
  font-size: 12px;
  color: var(--text-secondary);
}
.home-extra-arrow {
  margin-left: auto;
  flex-shrink: 0;
  color: var(--text-muted);
}

/* ============================================================
   EXAM PRACTICE SCREEN
   ============================================================ */

#screen-exam .screen-header {
  padding: 16px 20px 8px;
}

.exam-subject-pills {
  display: flex;
  gap: 8px;
  padding: 0 20px 12px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.exam-subject-pills::-webkit-scrollbar { display: none; }

.exam-subj-pill {
  flex-shrink: 0;
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  font-family: var(--font-body);
  transition: all 0.18s ease;
}
.exam-subj-pill.active {
  background: var(--accent-cyan-dim);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.exam-question-list {
  padding: 0 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.exam-question-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  overflow: hidden;
  cursor: pointer;
}
.exam-question-card.expanded {
  border-color: rgba(0, 212, 255, 0.25);
}

.exam-q-header {
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
}

.exam-q-badges {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  align-items: center;
}

.exam-badge {
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 600;
  font-family: var(--font-body);
  letter-spacing: 0.3px;
}
.exam-marks-badge {
  background: var(--accent-cyan-dim);
  color: var(--accent-cyan);
  border: 1px solid rgba(0,212,255,0.2);
}
.exam-cmd-badge {
  background: rgba(168, 85, 247, 0.12);
  color: #a855f7;
  border: 1px solid rgba(168, 85, 247, 0.2);
}
.exam-tier-badge {
  font-size: 10px;
  font-weight: 700;
  padding: 3px 7px;
  border-radius: 6px;
  border: 1px solid;
}
.exam-tier-badge.tier-higher {
  background: rgba(255, 184, 0, 0.12);
  color: var(--accent-amber);
  border-color: rgba(255, 184, 0, 0.25);
}
.exam-tier-badge.tier-both {
  background: rgba(0, 212, 255, 0.08);
  color: var(--accent-cyan);
  border-color: rgba(0, 212, 255, 0.2);
}
.exam-tier-badge.tier-foundation {
  background: rgba(34, 197, 94, 0.1);
  color: var(--accent-green);
  border-color: rgba(34, 197, 94, 0.2);
}

.exam-q-text {
  font-size: 14px;
  color: var(--text-primary);
  line-height: 1.5;
  padding-right: 28px;
}

.exam-expand-btn {
  position: absolute;
  top: 14px;
  right: 14px;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  transition: transform 0.22s ease, color 0.2s ease;
}
.exam-question-card.expanded .exam-expand-btn {
  transform: rotate(180deg);
  color: var(--accent-cyan);
}

.exam-q-body {
  border-top: 1px solid var(--glass-border);
  padding: 16px;
}

.exam-section-label {
  font-family: var(--font-heading);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 8px;
}
.exam-label-amber {
  color: var(--accent-amber) !important;
}

.mark-scheme-reveal-btn {
  width: 100%;
  padding: 11px;
  background: rgba(0,212,255,0.08);
  border: 1px dashed rgba(0,212,255,0.3);
  border-radius: 10px;
  color: var(--accent-cyan);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.18s ease;
}
.mark-scheme-reveal-btn:hover {
  background: rgba(0,212,255,0.14);
}

.mark-scheme-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 16px;
  font-size: 13px;
}
.mark-scheme-table th {
  text-align: left;
  padding: 8px 10px;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 11px;
  border-bottom: 1px solid var(--glass-border);
}
.mark-scheme-table td {
  padding: 8px 10px;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  color: var(--text-primary);
  line-height: 1.4;
}
.ms-marks {
  text-align: center;
  color: var(--accent-cyan);
  font-weight: 700;
  white-space: nowrap;
}

.exam-mark-scheme-section {
  margin-bottom: 16px;
}
.exam-model-answer {
  margin-top: 16px;
  margin-bottom: 16px;
}
.exam-model-answer-text {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  padding: 12px;
  background: rgba(0, 200, 150, 0.06);
  border-radius: 10px;
  border-left: 3px solid var(--accent-green);
}

.exam-common-mistakes {
  margin-bottom: 16px;
}
.exam-mistakes-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.exam-mistakes-list li {
  font-size: 13px;
  color: var(--text-secondary);
  padding: 8px 12px;
  background: rgba(255, 71, 87, 0.07);
  border-radius: 8px;
  border-left: 3px solid #ff4757;
  line-height: 1.4;
}
.exam-mistakes-list li::before {
  content: '✕ ';
  color: #ff4757;
  font-weight: 700;
}

.exam-tip {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  padding: 10px 12px;
  background: rgba(255, 184, 0, 0.07);
  border-radius: 10px;
  border-left: 3px solid var(--accent-amber);
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.4;
}
.exam-tip-icon { font-size: 15px; flex-shrink: 0; }

.exam-self-assess {
  padding-top: 12px;
  border-top: 1px solid var(--glass-border);
}
.exam-self-label {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
.exam-self-btns {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.exam-self-btn {
  min-width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  font-family: var(--font-body);
  transition: all 0.15s ease;
}
.exam-self-btn:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}
.exam-self-btn.selected {
  background: var(--accent-cyan-dim);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}
.exam-self-btn.exam-self-zero.selected {
  background: rgba(255,71,87,0.12);
  border-color: #ff4757;
  color: #ff4757;
}

.exam-empty {
  padding: 40px 20px;
  text-align: center;
  color: var(--text-secondary);
}

/* ============================================================
   SLOP DRILLS SCREEN
   ============================================================ */

#screen-slop .screen-header {
  padding: 16px 20px 8px;
}

.slop-category-pills {
  display: flex;
  gap: 8px;
  padding: 0 20px 16px;
  overflow-x: auto;
  scrollbar-width: none;
}
.slop-category-pills::-webkit-scrollbar { display: none; }

.slop-cat-pill {
  flex-shrink: 0;
  padding: 6px 16px;
  border-radius: 20px;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  font-family: var(--font-body);
  transition: all 0.18s ease;
}
.slop-cat-pill.active {
  background: var(--accent-cyan-dim);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.slop-drill-list {
  padding: 0 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.slop-drill-card {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  padding: 14px 16px;
  cursor: pointer;
  transition: background 0.18s ease, border-color 0.18s ease !important;
}
.slop-drill-card:hover {
  background: var(--glass-hover) !important;
  border-color: rgba(0, 212, 255, 0.2) !important;
}

.slop-drill-cat-icon {
  font-size: 24px;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.04);
  border-radius: 10px;
}

.slop-drill-info {
  flex: 1;
  min-width: 0;
}
.slop-drill-name {
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}
.slop-drill-desc {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.3;
  margin-bottom: 6px;
}
.slop-drill-meta {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}
.slop-drill-qcount {
  font-size: 11px;
  color: var(--text-muted);
  background: rgba(255,255,255,0.05);
  padding: 2px 7px;
  border-radius: 6px;
}
.slop-drill-stars {
  font-size: 11px;
  color: var(--accent-amber);
  letter-spacing: 1px;
}
.slop-tier-badge {
  font-size: 10px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 5px;
  border: 1px solid;
}
.slop-tier-badge.tier-higher {
  background: rgba(255, 184, 0, 0.1);
  color: var(--accent-amber);
  border-color: rgba(255, 184, 0, 0.2);
}
.slop-tier-badge.tier-both {
  background: rgba(0, 212, 255, 0.07);
  color: var(--accent-cyan);
  border-color: rgba(0, 212, 255, 0.18);
}
.slop-tier-badge.tier-foundation {
  background: rgba(34, 197, 94, 0.08);
  color: var(--accent-green);
  border-color: rgba(34, 197, 94, 0.18);
}

.slop-drill-arrow {
  flex-shrink: 0;
  color: var(--text-muted);
}
.slop-empty {
  padding: 40px 20px;
  text-align: center;
  color: var(--text-secondary);
}

/* SLOP Active Drill */
.slop-active-area {
  padding: 16px 20px 24px;
}

.slop-drill-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.slop-drill-title {
  flex: 1;
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
}
.slop-progress-text {
  font-size: 13px;
  color: var(--text-secondary);
  white-space: nowrap;
}

.slop-progress-bar-wrap {
  height: 4px;
  background: var(--glass-border);
  border-radius: 2px;
  margin-bottom: 12px;
  overflow: hidden;
}
.slop-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-cyan), #0090ff);
  border-radius: 2px;
  width: 0%;
  transition: width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.slop-score-row {
  display: flex;
  gap: 16px;
  margin-bottom: 16px;
  justify-content: flex-end;
}
.slop-score-got {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-green);
}
.slop-score-missed {
  font-size: 13px;
  font-weight: 600;
  color: #ff4757;
}

.slop-question-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 20px;
  margin-bottom: 16px;
}
.slop-q-text {
  font-size: 15px;
  color: var(--text-primary);
  line-height: 1.55;
  margin-bottom: 18px;
}

.slop-reveal-btn {
  width: 100%;
  padding: 13px;
  background: var(--accent-cyan-dim);
  border: 1px solid rgba(0,212,255,0.3);
  border-radius: 12px;
  color: var(--accent-cyan);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.18s ease;
}
.slop-reveal-btn:hover {
  background: rgba(0, 212, 255, 0.18);
}

.slop-answer-reveal {
  background: rgba(0, 200, 150, 0.06);
  border: 1px solid rgba(0, 200, 150, 0.2);
  border-radius: 14px;
  padding: 16px;
  margin-bottom: 16px;
}
.slop-answer-text {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 8px;
}
.slop-hint {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.4;
  margin-bottom: 10px;
  font-style: italic;
}

.slop-working-details {
  margin-bottom: 14px;
}
.slop-working-toggle {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  list-style: none;
  padding: 6px 0;
  user-select: none;
}
.slop-working-toggle::-webkit-details-marker { display: none; }
.slop-working-toggle::before {
  content: '▶ ';
  font-size: 10px;
  color: var(--accent-cyan);
}
details[open] .slop-working-toggle::before {
  content: '▼ ';
}
.slop-working-text {
  font-size: 12px;
  color: var(--text-secondary);
  white-space: pre-line;
  line-height: 1.6;
  padding: 10px;
  background: rgba(255,255,255,0.03);
  border-radius: 8px;
  margin-top: 6px;
}

.slop-self-mark {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 14px;
}
.slop-self-mark-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
.slop-self-mark-btns {
  display: flex;
  gap: 10px;
}
.slop-got-it-btn, .slop-missed-btn {
  flex: 1;
  padding: 11px;
  border-radius: 10px;
  border: none;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: opacity 0.15s ease, transform 0.12s ease;
}
.slop-got-it-btn {
  background: rgba(34, 197, 94, 0.18);
  color: var(--accent-green);
  border: 1px solid rgba(34, 197, 94, 0.3);
}
.slop-missed-btn {
  background: rgba(255, 71, 87, 0.12);
  color: #ff4757;
  border: 1px solid rgba(255, 71, 87, 0.25);
}
.slop-got-it-btn:active, .slop-missed-btn:active {
  transform: scale(0.96);
}

/* SLOP End Screen */
.slop-end-screen {
  text-align: center;
  padding: 40px 20px;
}
.slop-end-icon { font-size: 56px; margin-bottom: 12px; }
.slop-end-title {
  font-family: var(--font-heading);
  font-size: 24px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 24px;
}
.slop-end-stats {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 32px;
}
.slop-end-stat { text-align: center; }
.slop-end-val {
  font-family: var(--font-heading);
  font-size: 32px;
  font-weight: 800;
  color: var(--accent-cyan);
  margin-bottom: 4px;
}
.slop-end-label {
  font-size: 12px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.6px;
}
.slop-end-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 280px;
  margin: 0 auto;
}

/* ============================================================
   HOW TO REVISE SCREEN
   ============================================================ */

#screen-revise .screen-header {
  padding: 16px 20px 8px;
}

.revise-content {
  padding: 0 20px 40px;
}

.revise-intro {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 20px;
  margin-bottom: 24px;
}
.revise-intro-title {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.revise-intro-text {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.65;
}
.revise-intro-text p { margin-bottom: 10px; }
.revise-intro-text p:last-child { margin-bottom: 0; }
.revise-intro-text h3 {
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 12px 0 6px;
}
.revise-intro-text strong { color: var(--text-primary); }

.revise-section-title {
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.revise-strategies-section {
  margin-bottom: 24px;
}

.revise-strategy-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  margin-bottom: 10px;
  overflow: hidden;
  transition: border-color 0.2s ease;
}
.revise-strategy-card.expanded {
  border-color: rgba(0,212,255,0.2);
}

.revise-strategy-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  transition: background 0.15s ease;
}
.revise-strategy-header:hover {
  background: rgba(255,255,255,0.02);
}

.revise-strategy-icon {
  font-size: 22px;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.05);
  border-radius: 10px;
  flex-shrink: 0;
}
.revise-strategy-text { flex: 1; min-width: 0; }
.revise-strategy-title {
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 2px;
}
.revise-strategy-tagline {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.3;
}
.revise-strategy-chevron {
  flex-shrink: 0;
  color: var(--text-muted);
  transition: transform 0.22s ease;
}
.revise-strategy-card.expanded .revise-strategy-chevron {
  transform: rotate(180deg);
}

.revise-strategy-body {
  border-top: 1px solid var(--glass-border);
  padding: 16px;
}

.revise-strat-section {
  margin-bottom: 16px;
}
.revise-strat-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.7px;
  color: var(--accent-cyan);
  margin-bottom: 6px;
}
.revise-label-amber { color: var(--accent-amber) !important; }

.revise-strat-content {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.65;
}
.revise-strat-content p { margin-bottom: 8px; }
.revise-strat-content p:last-child { margin-bottom: 0; }
.revise-strat-content ul { padding-left: 16px; }
.revise-strat-content li { margin-bottom: 5px; }
.revise-strat-content h3 {
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 8px 0 6px;
}
.revise-strat-content strong { color: var(--text-primary); }

.revise-strat-mistake {
  background: rgba(255,71,87,0.05);
  border-radius: 10px;
  padding: 10px 12px;
  border-left: 3px solid #ff4757;
}
.revise-strat-tip {
  background: rgba(255,184,0,0.05);
  border-radius: 10px;
  padding: 10px 12px;
  border-left: 3px solid var(--accent-amber);
}

.revise-strat-feature-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--accent-cyan-dim);
  border-radius: 20px;
  font-size: 12px;
  color: var(--accent-cyan);
  font-weight: 500;
  margin-top: 4px;
}

/* Timetable section */
.revise-timetable {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 20px;
  margin-bottom: 24px;
}
.revise-section-intro {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 16px;
}

.revise-timetable-phase {
  margin-bottom: 16px;
  padding: 12px;
  background: rgba(255,255,255,0.02);
  border-radius: 10px;
  border: 1px solid var(--glass-border);
}
.revise-phase-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}
.revise-phase-name {
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
}
.revise-phase-when {
  font-size: 11px;
  color: var(--accent-cyan);
  background: var(--accent-cyan-dim);
  padding: 2px 8px;
  border-radius: 6px;
}
.revise-phase-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.revise-phase-list li {
  font-size: 12px;
  color: var(--text-secondary);
  padding-left: 12px;
  position: relative;
  line-height: 1.4;
}
.revise-phase-list li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
}

.revise-daily-structure {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--glass-border);
}

/* Exam Technique section */
.revise-exam-technique {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 20px;
  margin-bottom: 24px;
}
.revise-cw-row {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255,255,255,0.04);
}
.revise-cw-word {
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 700;
  color: var(--accent-cyan);
  min-width: 90px;
  flex-shrink: 0;
}
.revise-cw-def {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.3;
}
.revise-exam-tip {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  padding: 8px 10px;
  background: rgba(255,184,0,0.06);
  border-radius: 8px;
  margin-top: 8px;
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.4;
}
.revise-tip-icon { flex-shrink: 0; font-size: 13px; }

/* ============================================================
   MODE PICKER UPDATES (card count badges live in desc text)
   ============================================================ */

.mode-option-btn {
  transition: background 0.18s ease, border-color 0.18s ease !important;
}
.mode-option-desc {
  font-size: 12px !important;
}


/* ============================================================
   ROUNDS 1-8 NEW STYLES
   ============================================================ */

/* ---- Round 8: Focus-visible accessibility ---- */
*:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---- Round 1: Foundation/Higher tier badge in quiz ---- */
.session-tier-badge.tier-higher {
  background: rgba(255,184,0,0.15);
  color: var(--accent-amber);
  border: 1px solid rgba(255,184,0,0.3);
}

/* ---- Round 5: Global Search ---- */
.search-bar-wrap {
  position: relative;
  margin: 16px 0 8px;
}
.search-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 12px;
  padding: 10px 14px;
  transition: border-color 0.2s;
}
.search-bar:focus-within {
  border-color: var(--accent-cyan);
  background: rgba(0,212,255,0.04);
}
.search-icon {
  color: var(--text-muted);
  flex-shrink: 0;
}
.search-input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 15px;
  font-family: var(--font-body);
}
.search-input::placeholder {
  color: var(--text-muted);
}
.search-clear-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 14px;
  padding: 2px 4px;
  border-radius: 4px;
  transition: color 0.15s;
}
.search-clear-btn:hover { color: var(--text-primary); }

.search-results {
  position: absolute;
  top: calc(100% + 6px);
  left: 0; right: 0;
  background: #1a2540;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 14px;
  box-shadow: 0 16px 40px rgba(0,0,0,0.5);
  z-index: 999;
  max-height: 380px;
  overflow-y: auto;
  padding: 8px;
}
.search-group {
  margin-bottom: 4px;
}
.search-group-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding: 6px 10px 4px;
}
.search-result-item {
  padding: 10px 12px;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.15s;
}
.search-result-item:hover,
.search-result-item:focus {
  background: rgba(255,255,255,0.06);
  outline: none;
}
.search-result-main {
  font-size: 14px;
  color: var(--text-primary);
  margin-bottom: 2px;
}
.search-result-sub {
  font-size: 12px;
  color: var(--text-secondary);
}
.search-formula-text {
  font-family: 'Courier New', Courier, monospace;
  color: var(--accent-cyan);
}
.search-no-results {
  padding: 16px 12px;
  color: var(--text-muted);
  font-size: 14px;
  text-align: center;
}
.search-results mark {
  background: rgba(0,212,255,0.25);
  color: var(--accent-cyan);
  border-radius: 2px;
}

/* ---- Round 6: Keyboard shortcuts popover ---- */
.nav-shortcuts-btn {
  position: relative;
}
.shortcuts-popover {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  min-width: 260px;
  background: #1a2540;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 14px;
  padding: 16px;
  box-shadow: 0 20px 50px rgba(0,0,0,0.6);
  z-index: 1000;
}
.shortcuts-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 14px;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.shortcuts-section {
  margin-bottom: 10px;
}
.shortcuts-section-title {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-cyan);
  font-weight: 700;
  margin-bottom: 5px;
}
.shortcut-row {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 3px;
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}
kbd {
  display: inline-block;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 11px;
  font-family: 'Courier New', Courier, monospace;
  color: var(--text-primary);
}

/* ---- Round 7: Session settings ---- */
.session-settings {
  padding: 16px 0 4px;
  border-top: 1px solid rgba(255,255,255,0.06);
  margin-top: 12px;
}
.session-setting-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 10px;
  text-align: center;
}
.session-size-pills {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
}
.session-size-pill {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 20px;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 600;
  font-family: var(--font-heading);
  padding: 7px 18px;
  cursor: pointer;
  transition: all 0.18s;
}
.session-size-pill:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}
.session-size-pill.active {
  background: rgba(0,212,255,0.12);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* ---- Round 2: Physics Maths Screen ---- */
.pm-category-pills {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 0 16px 16px;
  scrollbar-width: none;
}
.pm-category-pills::-webkit-scrollbar { display: none; }
.pm-cat-pill {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 20px;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  padding: 7px 14px;
  white-space: nowrap;
  cursor: pointer;
  transition: all 0.18s;
}
.pm-cat-pill.active,
.pm-cat-pill:hover {
  background: rgba(0,212,255,0.1);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}
.pm-examples-list, .pm-detail-view {
  padding: 0 16px 80px;
}
.pm-cat-intro {
  margin-bottom: 16px;
}
.pm-cat-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}
.pm-example-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 14px;
  padding: 14px 16px;
  margin-bottom: 10px;
  cursor: pointer;
  transition: all 0.18s;
}
.pm-example-card:hover {
  background: rgba(255,255,255,0.06);
  border-color: rgba(0,212,255,0.3);
  transform: translateY(-1px);
}
.pm-example-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 6px;
  gap: 12px;
}
.pm-example-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}
.pm-example-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}
.pm-stars {
  font-size: 12px;
  color: var(--accent-amber);
}
.pm-example-eq {
  font-size: 13px;
  color: var(--accent-cyan);
  font-family: 'Courier New', Courier, monospace;
}

/* PM Detail view */
.pm-detail-back {
  display: flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  color: var(--accent-cyan);
  font-size: 14px;
  cursor: pointer;
  padding: 0 0 16px;
  font-family: var(--font-body);
}
.pm-detail-header {
  margin-bottom: 20px;
}
.pm-detail-title {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 6px;
}
.pm-detail-eq {
  font-size: 16px;
  color: var(--accent-cyan);
  font-family: 'Courier New', Courier, monospace;
  background: rgba(0,212,255,0.08);
  padding: 8px 14px;
  border-radius: 8px;
  display: inline-block;
}
.pm-section-heading {
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0 0 12px;
}
.pm-worked-example {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 14px;
  padding: 18px;
  margin-bottom: 16px;
}
.pm-we-question {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.pm-steps-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}
.pm-step-card {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.pm-step-num {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: rgba(0,212,255,0.15);
  color: var(--accent-cyan);
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.pm-step-body { flex: 1; }
.pm-step-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 2px;
}
.pm-step-content {
  font-size: 14px;
  color: var(--text-primary);
  font-family: 'Courier New', Courier, monospace;
}
.pm-answer-box {
  background: rgba(0,200,150,0.1);
  border: 1px solid rgba(0,200,150,0.3);
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 15px;
  color: var(--accent-green);
}
.pm-exam-tip-box {
  background: rgba(255,184,0,0.08);
  border: 1px solid rgba(255,184,0,0.2);
  border-radius: 12px;
  padding: 14px 16px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 16px;
  display: flex;
  gap: 10px;
}
.pm-practice-section {
  margin-top: 20px;
}
.pm-practice-item {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 12px;
  padding: 14px;
  margin-bottom: 10px;
}
.pm-practice-q {
  font-size: 14px;
  color: var(--text-primary);
  margin-bottom: 10px;
}
.pm-practice-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.pm-show-hint-btn,
.pm-show-ans-btn {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 20px;
  color: var(--text-secondary);
  font-size: 13px;
  padding: 5px 14px;
  cursor: pointer;
  transition: all 0.15s;
}
.pm-show-hint-btn:hover { border-color: var(--accent-amber); color: var(--accent-amber); }
.pm-show-ans-btn:hover { border-color: var(--accent-green); color: var(--accent-green); }
.pm-hint-reveal {
  margin-top: 8px;
  padding: 8px 12px;
  background: rgba(255,184,0,0.08);
  border-radius: 8px;
  font-size: 13px;
  color: var(--accent-amber);
}
.pm-ans-reveal {
  margin-top: 8px;
  padding: 8px 12px;
  background: rgba(0,200,150,0.1);
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-green);
}

/* ---- Round 3: Formula Sheets ---- */
.formula-subject-tabs {
  display: flex;
  gap: 4px;
  padding: 0 16px 16px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  margin-bottom: 0;
  overflow-x: auto;
  scrollbar-width: none;
}
.formula-subject-tabs::-webkit-scrollbar { display: none; }
.formula-tab {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 20px;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  padding: 8px 18px;
  cursor: pointer;
  transition: all 0.18s;
  white-space: nowrap;
}
.formula-tab.active,
.formula-tab:hover {
  background: rgba(0,212,255,0.12);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}
.formula-content {
  padding: 16px 16px 80px;
}
.formula-section {
  margin-bottom: 28px;
}
.formula-section-title {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.formula-cards-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.formula-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 14px;
  padding: 16px;
  transition: border-color 0.2s;
}
.formula-card:hover,
.formula-card:focus {
  border-color: rgba(0,212,255,0.3);
  outline: none;
}
.formula-card-top {
  margin-bottom: 10px;
}
.formula-name-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 8px;
}
.formula-name {
  font-size: 15px;
  color: var(--text-primary);
}
.formula-badges {
  display: flex;
  gap: 5px;
  flex-shrink: 0;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.formula-paper-badge {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 10px;
  font-size: 10px;
  padding: 2px 7px;
  color: var(--text-muted);
}
.formula-display {
  font-size: 24px;
  font-family: 'Courier New', Courier, monospace;
  color: var(--accent-cyan);
  background: rgba(0,212,255,0.06);
  padding: 10px 16px;
  border-radius: 10px;
  display: inline-block;
  letter-spacing: 0.05em;
  font-weight: 700;
}
.formula-vars {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 8px;
}
.formula-var-row {
  display: flex;
  gap: 10px;
  align-items: baseline;
  font-size: 13px;
}
.formula-var-key {
  font-family: 'Courier New', Courier, monospace;
  color: var(--accent-cyan);
  min-width: 20px;
  font-weight: 700;
}
.formula-var-desc {
  color: var(--text-secondary);
}
.formula-notes {
  margin-top: 10px;
  padding: 8px 12px;
  background: rgba(255,255,255,0.03);
  border-left: 2px solid rgba(255,184,0,0.4);
  border-radius: 0 8px 8px 0;
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.5;
}
.formula-empty {
  padding: 32px 16px;
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
}

/* Tier badges for formulas and physics maths */
.tier-badge {
  font-size: 10px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 10px;
  display: inline-block;
}
.tier-foundation {
  background: rgba(0,212,255,0.12);
  color: var(--accent-cyan);
  border: 1px solid rgba(0,212,255,0.25);
}
.tier-higher {
  background: rgba(255,184,0,0.12);
  color: var(--accent-amber);
  border: 1px solid rgba(255,184,0,0.25);
}
.tier-both {
  background: rgba(255,255,255,0.05);
  color: var(--text-secondary);
  border: 1px solid rgba(255,255,255,0.1);
}

/* ---- Round 4: Command Words ---- */
.command-words-list {
  padding: 8px 16px 80px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.cw-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 16px;
  overflow: hidden;
  transition: border-color 0.2s;
}
.cw-card:hover,
.cw-card:focus {
  border-color: rgba(0,212,255,0.25);
  outline: none;
}
.cw-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 16px;
  cursor: pointer;
  gap: 12px;
}
.cw-header-left {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
  min-width: 0;
}
.cw-icon {
  font-size: 22px;
  flex-shrink: 0;
}
.cw-header-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}
.cw-word {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 16px;
  color: var(--text-primary);
}
.cw-definition {
  font-size: 13px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.cw-header-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.cw-marks-badge {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 10px;
  font-size: 11px;
  color: var(--text-muted);
  padding: 2px 8px;
  white-space: nowrap;
}
.cw-chevron {
  transition: transform 0.25s;
  color: var(--text-muted);
  flex-shrink: 0;
}
.cw-chevron.rotated {
  transform: rotate(180deg);
}
.cw-body {
  padding: 0 16px 16px;
  border-top: 1px solid rgba(255,255,255,0.05);
}
.cw-section-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-muted);
  margin-bottom: 6px;
  margin-top: 14px;
}
.cw-examiner-wants p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}
.cw-mistake-box {
  background: rgba(255,71,87,0.08);
  border: 1px solid rgba(255,71,87,0.2);
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-top: 12px;
}
.cw-mistake-icon {
  font-size: 16px;
  flex-shrink: 0;
}
.cw-subject-tabs {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}
.cw-subj-tab {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 16px;
  color: var(--text-secondary);
  font-size: 12px;
  padding: 4px 12px;
  cursor: pointer;
  transition: all 0.15s;
}
.cw-subj-tab.active,
.cw-subj-tab:hover {
  background: rgba(0,212,255,0.1);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}
.cw-example {
  background: rgba(255,255,255,0.02);
  border-radius: 10px;
  padding: 12px;
  font-size: 13px;
}
.cw-question {
  font-style: italic;
  color: var(--text-muted);
  margin-bottom: 10px;
  font-size: 13px;
}
.cw-answer-row {
  padding: 10px 12px;
  border-radius: 8px;
  margin-bottom: 6px;
  line-height: 1.5;
  font-size: 13px;
}
.cw-ans-label {
  font-weight: 700;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 4px;
}
.cw-good {
  background: rgba(0,200,150,0.08);
  border: 1px solid rgba(0,200,150,0.2);
  color: var(--text-secondary);
}
.cw-good .cw-ans-label { color: var(--accent-green); }
.cw-bad {
  background: rgba(255,71,87,0.06);
  border: 1px solid rgba(255,71,87,0.15);
  color: var(--text-secondary);
}
.cw-bad .cw-ans-label { color: var(--error); }
.cw-why-bad {
  margin-top: 6px;
  padding-top: 6px;
  border-top: 1px solid rgba(255,71,87,0.1);
  font-size: 12px;
  color: var(--text-muted);
}
.cw-starters-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.cw-starter-pill {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 16px;
  color: var(--text-secondary);
  font-size: 12px;
  padding: 5px 12px;
  cursor: pointer;
  transition: all 0.15s;
  font-family: var(--font-body);
}
.cw-starter-pill:hover {
  background: rgba(0,212,255,0.1);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* ---- Home extras additional buttons ---- */
.home-extras {
  display: flex;
  flex-direction: column;
  gap: 8px;
}


/* ============================================================
   ROUND 9: DAILY CHALLENGE
   ============================================================ */

.daily-challenge-wrap {
  margin: 0 0 16px;
}

/* FIX 11: Daily Challenge more compact */
.daily-challenge-card {
  background: linear-gradient(135deg, rgba(255,184,0,0.08) 0%, rgba(0,212,255,0.08) 100%);
  border: 1px solid rgba(255,184,0,0.25);
  border-radius: 16px;
  padding: 12px 16px;
  position: relative;
  overflow: hidden;
}

.daily-challenge-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, #ffb800, #00d4ff);
  border-radius: 16px 16px 0 0;
}

.dc-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.dc-trophy {
  font-size: 18px;
}

.dc-title {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 700;
  font-size: 15px;
  color: #ffb800;
  flex: 1;
}

.dc-completed-badge {
  font-size: 12px;
  font-weight: 600;
  color: #00c896;
  background: rgba(0, 200, 150, 0.12);
  border: 1px solid rgba(0, 200, 150, 0.3);
  border-radius: 20px;
  padding: 2px 10px;
}

.dc-question-text {
  font-size: 14px;
  color: var(--text-primary);
  line-height: 1.5;
  margin-bottom: 12px;
}

.dc-badges {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.dc-cmd-badge {
  font-size: 11px;
  font-weight: 600;
  color: #00d4ff;
  background: rgba(0, 212, 255, 0.12);
  border: 1px solid rgba(0, 212, 255, 0.25);
  border-radius: 20px;
  padding: 3px 10px;
  text-transform: capitalize;
}

.dc-marks-badge {
  font-size: 11px;
  font-weight: 600;
  color: #ffb800;
  background: rgba(255, 184, 0, 0.12);
  border: 1px solid rgba(255, 184, 0, 0.25);
  border-radius: 20px;
  padding: 3px 10px;
}

.dc-attempt-btn {
  width: 100%;
  padding: 10px 0;
  background: linear-gradient(135deg, #ffb800, #ff9500);
  color: #0f1729;
  border: none;
  border-radius: 10px;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
  transition: transform 0.15s, opacity 0.15s;
}

.dc-attempt-btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.dc-expanded {
  margin-top: 14px;
  border-top: 1px solid rgba(255, 184, 0, 0.15);
  padding-top: 14px;
}

.dc-ms-hidden {
  text-align: center;
}

.dc-reveal-btn {
  padding: 9px 22px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

.dc-reveal-btn:hover {
  background: rgba(255,255,255,0.1);
}

.dc-ms-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.dc-ms-tbl {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin-bottom: 12px;
}

.dc-ms-tbl th {
  text-align: left;
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 600;
  padding: 4px 8px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.dc-ms-tbl td {
  padding: 6px 8px;
  color: var(--text-primary);
  border-bottom: 1px solid rgba(255,255,255,0.04);
  line-height: 1.4;
}

.dc-ma-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 6px;
  margin-top: 10px;
}

.dc-ma-text {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ============================================================
   ROUND 10: WEAK TOPICS
   ============================================================ */

.weak-topics-wrap {
  margin: 0 0 16px;
}

.weak-topics-header {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 10px;
}

.weak-topics-title {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 700;
  font-size: 14px;
  color: var(--text-primary);
}

.weak-topics-sub {
  font-size: 12px;
  color: var(--text-muted);
}

.weak-topics-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.weak-topic-card {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 12px;
  padding: 12px 14px;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

.weak-topic-card:hover {
  background: rgba(255,255,255,0.05);
  transform: translateX(2px);
}

.wt-indicator {
  width: 4px;
  height: 36px;
  border-radius: 2px;
  flex-shrink: 0;
}

.wt-info {
  flex: 1;
  min-width: 0;
}

.wt-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.wt-subject {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
}

.wt-label-badge {
  font-size: 11px;
  font-weight: 700;
  flex-shrink: 0;
}

.subject-recommended-badge {
  position: absolute;
  top: 10px;
  right: 10px;
  font-size: 10px;
  font-weight: 700;
  color: #ff4757;
  background: rgba(255, 71, 87, 0.12);
  border: 1px solid rgba(255, 71, 87, 0.3);
  border-radius: 12px;
  padding: 2px 7px;
  letter-spacing: 0.03em;
}

/* Mastered subject glow */
.subject-card-mastered-glow {
  box-shadow: 0 0 0 1px rgba(0, 200, 150, 0.3), 0 4px 20px rgba(0, 200, 150, 0.1);
}

/* ============================================================
   ROUND 11: SESSION SUMMARY MOTIVATIONAL
   ============================================================ */

.summary-motivational {
  margin: 20px 0;
  padding: 16px 18px;
  background: rgba(0, 212, 255, 0.05);
  border: 1px solid rgba(0, 212, 255, 0.12);
  border-radius: 14px;
  text-align: left;
}

.sum-streak-msg {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.4;
}

.sum-accuracy-msg {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 12px;
  line-height: 1.4;
}

.sum-tip {
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  gap: 8px;
  align-items: flex-start;
  line-height: 1.5;
  padding-top: 10px;
  border-top: 1px solid rgba(255,255,255,0.06);
}

.sum-tip-icon {
  font-size: 14px;
  flex-shrink: 0;
  margin-top: 1px;
}

/* ============================================================
   ROUND 12: CELEBRATION MODAL & CONFETTI
   ============================================================ */

@keyframes confetti-fall {
  0% { transform: translateY(0) rotate(0deg); opacity: 1; }
  100% { transform: translateY(100vh) rotate(720deg); opacity: 0; }
}

.confetti-piece {
  position: fixed;
  top: -10px;
  z-index: 10000;
  pointer-events: none;
  animation: confetti-fall 2.5s ease-in forwards;
}

.celebration-modal {
  background: var(--glass-card);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 20px;
  padding: 32px 28px;
  text-align: center;
  max-width: 340px;
  width: 90%;
  position: relative;
  z-index: 10001;
  animation: slideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideUp {
  from { transform: translateY(40px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.celebration-icon {
  font-size: 52px;
  margin-bottom: 12px;
  display: block;
}

.celebration-title {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 22px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.celebration-topic-name {
  font-size: 16px;
  font-weight: 700;
  color: #00d4ff;
  margin-bottom: 4px;
}

.celebration-subject-name {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.celebration-stats {
  margin-bottom: 12px;
}

.celebration-cards {
  font-size: 13px;
  color: #00c896;
  font-weight: 600;
  background: rgba(0, 200, 150, 0.1);
  border: 1px solid rgba(0, 200, 150, 0.2);
  border-radius: 20px;
  padding: 3px 14px;
}

.celebration-msg {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 20px;
}

.celebration-continue-btn {
  width: 100%;
  padding: 12px;
  background: linear-gradient(135deg, #00d4ff, #0099cc);
  color: #0f1729;
  border: none;
  border-radius: 12px;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  transition: transform 0.15s, opacity 0.15s;
}

.celebration-continue-btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

/* Mastered star badge in topic list */
.topic-mastered-star {
  font-size: 14px;
  color: #ffb800;
  margin-right: 4px;
}

/* ============================================================
   ROUND 13: PRINT CHECKLIST MODAL
   ============================================================ */

.print-checklist-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  margin: 0 0 12px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 10px;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
  width: 100%;
  justify-content: center;
}

.print-checklist-btn:hover {
  background: rgba(255,255,255,0.07);
  color: var(--text-primary);
}

.print-checklist-overlay {
  align-items: flex-start !important;
  overflow-y: auto;
  padding: 20px 0;
}

.print-checklist-modal {
  background: #fff;
  color: #1a1a2e;
  border-radius: 12px;
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  overflow: hidden;
}

.pcm-actions {
  display: flex;
  gap: 10px;
  padding: 14px 20px;
  background: #f5f7fa;
  border-bottom: 1px solid #e0e4ed;
  justify-content: flex-end;
}

.pcm-print-btn, .pcm-close-btn {
  padding: 8px 18px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: none;
}

.pcm-print-btn {
  background: #0f1729;
  color: #fff;
}

.pcm-close-btn {
  background: transparent;
  color: #666;
  border: 1px solid #ccc;
}

.pcm-content {
  padding: 28px 32px;
}

.pcm-header {
  margin-bottom: 24px;
  border-bottom: 2px solid #0f1729;
  padding-bottom: 16px;
}

.pcm-subject-title {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 22px;
  font-weight: 800;
  color: #0f1729;
  margin: 0 0 6px;
}

.pcm-exam-board {
  font-size: 13px;
  color: #666;
  font-weight: 600;
  margin: 0 0 6px;
}

.pcm-instructions {
  font-size: 12px;
  color: #888;
  margin: 0;
}

.pcm-topic-section {
  margin-bottom: 20px;
  page-break-inside: avoid;
}

.pcm-topic-header {
  display: flex;
  align-items: center;
  gap: 10px;
  background: #f5f7fa;
  border-radius: 8px;
  padding: 10px 14px;
  margin-bottom: 8px;
}

.pcm-checkbox {
  width: 18px;
  height: 18px;
  accent-color: #0f1729;
  flex-shrink: 0;
}

.pcm-topic-name {
  flex: 1;
  font-weight: 700;
  font-size: 14px;
  color: #1a1a2e;
  cursor: pointer;
}

.pcm-card-count {
  font-size: 11px;
  color: #888;
  font-weight: 600;
  flex-shrink: 0;
}

.pcm-concepts-list {
  list-style: none;
  margin: 0 0 0 28px;
  padding: 0;
}

.pcm-concepts-list li {
  font-size: 12px;
  color: #444;
  padding: 3px 0;
  border-bottom: 1px solid #f0f2f7;
  line-height: 1.4;
}

.pcm-more {
  color: #aaa !important;
  font-style: italic;
}

/* Print styles */
@media print {
  body > *:not(#print-checklist-overlay) { display: none !important; }
  #print-checklist-overlay { display: block !important; position: static !important; background: none !important; padding: 0 !important; }
  .print-checklist-modal { box-shadow: none !important; border-radius: 0 !important; }
  .no-print, .pcm-actions { display: none !important; }
  .pcm-topic-section { page-break-inside: avoid; }
}

/* ============================================================
   ROUND 15: PERFORMANCE POLISH — LOADING STATE
   ============================================================ */

.content-loading-skeleton {
  padding: 16px;
}

.skel-line {
  background: linear-gradient(90deg,
    rgba(255,255,255,0.04) 25%,
    rgba(255,255,255,0.08) 50%,
    rgba(255,255,255,0.04) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  height: 16px;
  border-radius: 4px;
  margin-bottom: 10px;
}

.skel-line-lg { height: 28px; width: 70%; }
.skel-line-sm { width: 45%; }

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}


/* ============================================================ */
/* UI/UX FIXES — Applied Feb 2026                              */
/* ============================================================ */

/* FIX 2: XP bar / level indicator spacing override */
.xp-bar-wrap {
  margin: 4px 0 0;
  min-width: 120px;
}

/* FIX 3: Pomodoro FAB — add bottom padding to page content so FAB doesn't overlap */
#app {
  padding-bottom: 80px;
}

.screen {
  padding-bottom: 100px;
}

/* Pomodoro FAB — make it slightly smaller and semi-transparent when idle */
#pomodoro-float-btn {
  opacity: 0.75;
  transition: opacity 0.2s, transform 0.2s;
}
#pomodoro-float-btn:hover {
  opacity: 1;
}

/* FIX 4: Nav btn label text (for FIX 10 labels) */
.nav-btn-label {
  font-size: 9px;
  color: var(--text-muted);
  line-height: 1;
  letter-spacing: 0.3px;
  pointer-events: none;
}

/* FIX 5: Consistent back button style */
.back-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  min-width: 44px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-secondary);
  cursor: pointer;
  flex-shrink: 0;
  transition: all 0.2s;
  justify-content: center;
}

.back-btn:hover {
  background: var(--glass-hover);
  color: var(--text-primary);
  border-color: rgba(255,255,255,0.15);
}

/* FIX 7: Home screen section spacing */
.section-label {
  margin-top: 24px;
  margin-bottom: 12px;
  padding-top: 4px;
  border-top: 1px solid var(--glass-border);
}

.home-header {
  margin-bottom: 20px;
}

.quick-stats {
  margin-bottom: 16px;
}

.study-all-btn {
  margin-bottom: 16px;
}

.subject-grid {
  gap: 12px;
  margin-bottom: 8px;
}

.home-extras {
  margin-top: 24px;
  border-top: 1px solid var(--glass-border);
  padding-top: 8px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* FIX 9: Consistent card spacing */
.topic-card {
  padding: 16px;
  margin-bottom: 0;
}

.subject-card {
  margin-bottom: 0;
}

/* FIX 11: Daily challenge DC header compact */
.dc-header {
  margin-bottom: 8px;
}

.dc-question-text {
  font-size: 13px;
  margin-bottom: 8px;
  line-height: 1.45;
}

.dc-badges {
  margin-bottom: 10px;
}

.dc-attempt-btn {
  padding: 8px 16px;
  font-size: 13px;
}

/* FIX 2: XP bar — ensure it doesn't collapse */
.xp-bar-wrap {
  min-width: 140px;
}

/* FIX 7: Breathing room between daily challenge and rest */
.daily-challenge-wrap {
  margin-bottom: 20px;
}

/* FIX 9: Section divider spacing */
.board-selector {
  margin-bottom: 8px;
}

.tier-selector {
  margin-bottom: 12px;
}


/* FIX 14: Pricing screen — Free tier badge */
.pricing-free-starter-badge {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  color: var(--accent-green);
  background: rgba(34, 197, 94, 0.12);
  border: 1px solid rgba(34, 197, 94, 0.25);
  border-radius: 20px;
  padding: 2px 8px;
  margin-left: 8px;
  vertical-align: middle;
  letter-spacing: 0.2px;
}

/* FIX 14: Tone down Pro badge — remove flashy BEST VALUE badge via hiding original */
.pricing-pro-badge {
  display: none;
}



/* ============================================================
   DESKTOP LAYOUT OVERHAUL
   All desktop styles are additive via min-width media queries.
   Mobile layout is completely untouched.
   ============================================================ */

/* ============================================================
   TABLET (768px+)
   ============================================================ */
@media (min-width: 768px) {

  /* --- Body font size boost --- */
  body {
    font-size: 16px;
  }

  /* --- Override the narrow max-width variable for desktop --- */
  :root {
    --max-width: 100%;
  }

  /* --- App wrapper: full width --- */
  #app {
    max-width: 100%;
  }

  /* --- Navbar: full width, more padding --- */
  .nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 32px;
  }

  /* Show text labels on nav buttons */
  .nav-btn {
    flex-direction: row;
    gap: 6px;
    padding: 6px 12px;
    font-size: 13px;
    height: auto;
    min-height: 36px;
  }

  /* --- Screens: wider content container --- */
  .screen {
    max-width: 900px;
    margin: 0 auto;
    padding: 32px 32px 80px;
  }

  /* --- Home screen hero --- */
  .hero-title {
    font-size: 32px;
  }

  .hero-sub {
    font-size: 15px;
  }

  /* --- Quick stats: 4 columns at 768px --- */
  .quick-stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
  }

  .qstat {
    padding: 18px 16px;
  }

  .qstat-val {
    font-size: 26px;
  }

  .qstat-label {
    font-size: 12px;
  }

  /* --- Subject grid: 3 columns at 768px --- */
  .subject-grid {
    grid-template-columns: repeat(3, 1fr) !important;
    gap: 14px;
  }

  .subject-card {
    padding: 20px 18px;
  }

  /* Subject cards: vertical layout on grid */
  .subject-card {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .subject-icon-wrap {
    width: 48px;
    height: 48px;
    font-size: 22px;
  }

  .subject-name {
    font-size: 16px;
  }

  .subject-meta {
    font-size: 13px;
  }

  /* Keep progress ring on the right — restore row layout for subject card */
  .subject-card {
    flex-direction: row;
    align-items: center;
    gap: 16px;
  }

  /* --- Home extras: 2 columns --- */
  .home-extras {
    display: grid !important;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    padding: 0;
  }

  .home-extra-btn {
    padding: 18px 20px;
    border-radius: 18px;
  }

  .home-extra-title {
    font-size: 15px;
  }

  /* --- Study subject button wider --- */
  .study-all-btn {
    padding: 22px 28px;
  }

  .study-all-title {
    font-size: 17px;
  }

  /* --- Screen headers larger --- */
  .screen-title {
    font-size: 26px;
  }

  /* --- Flashcard study view --- */
  .card-scene {
    max-width: 680px;
    margin-left: auto;
    margin-right: auto;
    min-height: 320px;
  }

  .card-container {
    min-height: 320px;
  }

  .card-face {
    min-height: 320px;
    padding: 36px 36px 28px;
  }

  .card-question {
    font-size: 22px;
  }

  .card-answer {
    font-size: 17px;
    line-height: 1.7;
  }

  /* Rating buttons wider */
  .rating-buttons {
    max-width: 680px;
    margin: 0 auto;
    gap: 12px;
  }

  .rating-btn {
    padding: 16px 10px;
  }

  .rating-icon { font-size: 18px; }
  .rating-name { font-size: 12px; }
  .rating-interval { font-size: 10px; }

  /* Progress bar wider */
  .study-progress-bar-wrap {
    max-width: 680px;
    margin-left: auto;
    margin-right: auto;
    height: 4px;
    margin-bottom: 32px;
  }

  /* Quiz card wider */
  .quiz-card {
    padding: 32px 32px 24px;
  }

  .quiz-question {
    font-size: 20px;
  }

  .quiz-options {
    max-width: 680px;
    margin-left: auto;
    margin-right: auto;
  }

  .quiz-option-btn {
    padding: 18px 22px;
    font-size: 15px;
  }

  /* --- Stats screen: 2-column hero row --- */
  .stats-hero-row {
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
  }

  .stat-hero-card {
    padding: 20px 16px;
  }

  .stat-hero-val {
    font-size: 30px;
  }

  .stat-hero-icon {
    font-size: 26px;
  }

  /* Subject mastery 2-column */
  #subject-mastery-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 24px;
  }

  /* Card status grid wider */
  .card-status-grid {
    gap: 14px;
  }

  .cs-val {
    font-size: 26px;
  }

  /* Heatmap wider columns */
  .heatmap-container {
    gap: 4px;
    padding: 16px;
  }

  /* --- Pricing screen: side by side --- */
  .pricing-cards {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
  }

  .pricing-card {
    padding: 28px 24px;
  }

  .pricing-amount {
    font-size: 40px;
  }

  /* --- Auth screen: centred card --- */
  #screen-auth {
    padding: 48px 32px;
  }

  .auth-container {
    max-width: 480px;
  }

  .auth-card {
    padding: 36px 32px;
  }

  /* --- Summary screen --- */
  .summary-content {
    max-width: 600px;
    margin: 0 auto;
    padding: 32px 0;
  }

  .summary-stats {
    gap: 16px;
  }

  .sum-stat-val {
    font-size: 32px;
  }

  .summary-actions {
    flex-direction: row;
    gap: 14px;
  }

  .btn-primary,
  .btn-secondary {
    padding: 16px 32px;
    font-size: 16px;
  }

  /* --- Topics screen --- */
  .topics-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .topic-card {
    padding: 18px 20px;
  }

  .topic-name {
    font-size: 15px;
  }

  /* --- Onboarding modal --- */
  .onboarding-modal {
    max-width: 520px;
  }

  /* --- Section labels --- */
  .section-label {
    font-size: 12px;
  }

  /* --- Hover effects: scale on cards --- */
  .subject-card:hover {
    transform: translateY(-2px) translateX(0);
    box-shadow: 0 6px 24px rgba(0, 212, 255, 0.12);
    border-color: rgba(0, 212, 255, 0.2);
  }

  .topic-card:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.3);
  }

  .home-extra-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 212, 255, 0.1);
  }

  /* --- Cursor pointer on all interactive elements --- */
  .subject-card,
  .topic-card,
  .home-extra-btn,
  .qstat,
  .stat-hero-card,
  .pricing-card,
  .rating-btn,
  .quiz-option-btn {
    cursor: pointer;
  }

  /* --- Smooth transitions on all hover states --- */
  .subject-card,
  .topic-card,
  .home-extra-btn,
  .stat-hero-card,
  .pricing-card,
  .quiz-option-btn {
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  }

  /* --- Text-heavy screens: max 800px, centre content --- */
  #screen-revise .revise-content,
  #screen-privacy .privacy-content,
  #screen-terms .terms-content,
  #screen-lesson .lesson-content {
    max-width: 800px;
    margin: 0 auto;
    font-size: 16px;
    line-height: 1.75;
  }

  #screen-revise,
  #screen-privacy,
  #screen-terms,
  #screen-lesson,
  #screen-physics-maths,
  #screen-formulas,
  #screen-command-words,
  #screen-practicals,
  #screen-eal-glossary {
    max-width: 860px;
  }

  /* --- Study all button hover glow --- */
  .study-all-btn:hover {
    box-shadow: 0 8px 32px rgba(0, 212, 255, 0.2);
    border-color: rgba(0, 212, 255, 0.4);
  }

  /* --- Nav buttons larger on desktop --- */
  .nav-btn:hover {
    transform: translateY(-1px);
  }
}

/* ============================================================
   DESKTOP (1024px+)
   ============================================================ */
@media (min-width: 1024px) {

  /* --- Body font size --- */
  body {
    font-size: 17px;
  }

  /* --- Navbar --- */
  .nav-inner {
    max-width: 1200px;
    padding: 0 40px;
  }

  .brand-text {
    font-size: 19px;
  }

  /* --- Screens wider on large desktop --- */
  .screen {
    max-width: 1200px;
    padding: 40px 48px 80px;
  }

  /* --- Home screen --- */
  .hero-title {
    font-size: 36px;
  }

  /* Home header layout: side-by-side hero info and streak badge */
  .home-header {
    margin-bottom: 32px;
  }

  /* --- Subject grid: 4 columns on 1024px+ --- */
  .subject-grid {
    grid-template-columns: repeat(4, 1fr) !important;
    gap: 16px;
  }

  /* --- Home extras: 2 columns on 1024px (readability) --- */
  .home-extras {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 14px;
  }

  /* --- Quick stats: 4 columns with more breathing room --- */
  .quick-stats {
    gap: 16px;
    margin-bottom: 24px;
  }

  .qstat {
    padding: 22px 20px;
  }

  .qstat-val {
    font-size: 28px;
  }

  /* --- Flashcard: larger --- */
  .card-scene {
    max-width: 720px;
    min-height: 360px;
  }

  .card-container {
    min-height: 360px;
  }

  .card-face {
    min-height: 360px;
    padding: 40px 44px 32px;
  }

  .card-question {
    font-size: 24px;
  }

  .card-answer {
    font-size: 18px;
  }

  /* Rating buttons: fixed width centred */
  .rating-buttons {
    max-width: 720px;
    gap: 14px;
  }

  .rating-btn {
    padding: 18px 12px;
  }

  .rating-icon { font-size: 20px; }
  .rating-name { font-size: 13px; }

  /* Study progress bar */
  .study-progress-bar-wrap {
    max-width: 720px;
    height: 5px;
    margin-bottom: 36px;
  }

  /* Quiz */
  .quiz-card {
    padding: 40px 40px 28px;
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
  }

  .quiz-question {
    font-size: 22px;
  }

  .quiz-options {
    max-width: 720px;
  }

  .quiz-option-btn {
    padding: 20px 24px;
    font-size: 16px;
  }

  /* --- Stats screen --- */
  .stats-hero-row {
    gap: 18px;
    margin-bottom: 32px;
  }

  .stat-hero-card {
    padding: 24px 18px;
  }

  .stat-hero-val {
    font-size: 34px;
  }

  #subject-mastery-list {
    gap: 0 32px;
  }

  /* Heatmap */
  .heatmap-container {
    gap: 5px;
    padding: 20px;
  }

  /* --- Pricing: centred, wider --- */
  .pricing-container {
    max-width: 900px;
    margin: 0 auto;
  }

  .pricing-cards {
    gap: 28px;
    max-width: 860px;
  }

  .pricing-card {
    padding: 32px 28px;
  }

  .pricing-title {
    font-size: 32px;
  }

  .pricing-amount {
    font-size: 44px;
  }

  /* --- Auth screen --- */
  .auth-container {
    max-width: 480px;
  }

  /* --- Topics screen: 2-column grid --- */
  .topics-list {
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }

  .topic-card {
    padding: 20px 22px;
  }

  .topic-name {
    font-size: 16px;
  }

  /* --- Screen headers --- */
  .screen-title {
    font-size: 28px;
  }

  /* --- Summary screen --- */
  .summary-title {
    font-size: 32px;
  }

  .sum-stat-val {
    font-size: 36px;
  }

  /* --- Text-heavy screens --- */
  #screen-revise,
  #screen-privacy,
  #screen-terms,
  #screen-lesson,
  #screen-physics-maths,
  #screen-formulas,
  #screen-command-words,
  #screen-practicals,
  #screen-eal-glossary {
    max-width: 960px;
  }

  /* Content text max-width for readability */
  #screen-physics-maths .pme-section,
  #screen-formulas .formula-section,
  #screen-command-words .cw-section,
  #screen-practicals .practical-section {
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
  }

  /* --- Hover effects: stronger glow on desktop --- */
  .subject-card:hover {
    box-shadow: 0 8px 32px rgba(0, 212, 255, 0.18);
    border-color: rgba(0, 212, 255, 0.3);
  }

  .home-extra-btn:hover {
    box-shadow: 0 8px 28px rgba(0, 212, 255, 0.14);
  }

  .pricing-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 212, 255, 0.15);
  }

  .pricing-pro-card:hover {
    box-shadow: 0 12px 48px rgba(0, 212, 255, 0.25);
  }

  /* --- Scrollbar wider on desktop --- */
  ::-webkit-scrollbar { width: 6px; }

  /* --- Screen padding override for screens with inline padding styles --- */
  #screen-writing-drills,
  #screen-exam-tips,
  #screen-mistake-patterns,
  #screen-custom-quiz,
  #screen-achievements,
  #screen-equation-balancer,
  #screen-my-notes {
    padding: 40px 48px 80px !important;
    max-width: 1200px;
    margin: 0 auto;
  }

  /* --- Stat hero cards hover glow --- */
  .stat-hero-card:hover {
    border-color: rgba(0, 212, 255, 0.2);
    box-shadow: 0 6px 24px rgba(0, 212, 255, 0.1);
  }

  .streak-card:hover {
    border-color: rgba(255, 184, 0, 0.25);
    box-shadow: 0 6px 24px rgba(255, 184, 0, 0.12);
  }

  .mastered-card:hover {
    border-color: rgba(34, 197, 94, 0.25);
    box-shadow: 0 6px 24px rgba(34, 197, 94, 0.12);
  }
}

/* ============================================================
   LARGE DESKTOP (1280px+)
   Fine-tuning for 1440px screens
   ============================================================ */
@media (min-width: 1280px) {

  /* Slightly wider max container */
  .screen {
    max-width: 1200px;
    padding: 40px 60px 80px;
  }

  .nav-inner {
    padding: 0 48px;
  }

  /* Subject grid stays 4 columns but with more gap */
  .subject-grid {
    gap: 18px !important;
  }

  /* Quick stats with comfortable spacing */
  .quick-stats {
    gap: 18px;
  }

  /* Home extras 4 columns on large desktop */
  .home-extras {
    grid-template-columns: repeat(4, 1fr) !important;
    gap: 14px;
  }

  /* Study all button more prominent */
  .study-all-btn {
    padding: 24px 32px;
  }

  .study-all-title {
    font-size: 18px;
  }

  .study-all-sub {
    font-size: 14px;
  }

  /* Stats: more comfortable */
  .stats-hero-row {
    gap: 20px;
  }

  .pricing-cards {
    max-width: 900px;
    gap: 32px;
  }
}

/* ============================================================
   DESKTOP: SIDEBAR INTEGRATION FIXES
   When rounds61to75.js injects .screens-wrap,
   these rules ensure proper layout.
   ============================================================ */
@media (min-width: 768px) {
  /* When sidebar is present, content area uses remaining width */
  .screens-wrap {
    min-width: 0;
    overflow-x: hidden;
  }

  /* Screens inside screens-wrap still use auto-centering */
  .screens-wrap .screen {
    max-width: 1200px;
    margin: 0 auto;
  }

  /* Ensure sidebar doesn't interfere with max-width of screens */
  #app.has-sidebar .screen {
    max-width: none;
    width: 100%;
  }
}

@media (min-width: 1024px) {
  /* Desktop sidebar layout */
  .screens-wrap .screen {
    padding-left: 40px;
    padding-right: 40px;
  }
}

/* ============================================================
   DESKTOP: NAV BAR WIDTH OVERRIDE
   Navbar spans full width, not capped at --max-width
   ============================================================ */
@media (min-width: 768px) {
  .navbar {
    /* Ensure navbar is full-width regardless of --max-width */
    max-width: none;
    width: 100%;
  }
}