/* ─── DESIGN TOKENS ──────────────────────────────────────────── */
:root {
  --pink:         #FFB3C6;
  --pink-mid:     #f782a0;
  --pink-dark:    #e8829d;
  --pink-deep:    #c9547a;
  --lavender:     #C9B8E8;
  --lavender-dark:#a492d4;
  --mint:         #B8E8D0;
  --peach:        #FFD5B8;
  --sky:          #B8D8E8;
  --yellow:       #FFF0A0;
  --bg:           #FFFDF9;
  --card-bg:      #FFFFFF;
  --text:         #4A4560;
  --text-light:   #8880a8;
  --text-muted:   #b0aac8;
  --success:      #6DD08B;
  --success-dark: #3faa60;
  --error:        #FFB3B3;
  --error-dark:   #e07070;
  --border:       #ede8f5;
  --shadow:       0 4px 20px rgba(74,69,96,0.08);
  --shadow-hover: 0 8px 30px rgba(74,69,96,0.15);
  --shadow-lg:    0 12px 40px rgba(74,69,96,0.18);
  --radius:       20px;
  --radius-sm:    12px;
  --radius-xs:    8px;
  --radius-pill:  999px;

  /* Chapter accent colours */
  --ch1: #FFB3C6; --ch1-dark: #e8829d;
  --ch2: #B8D8FF; --ch2-dark: #6aaee8;
  --ch3: #FFD5B8; --ch3-dark: #e8a06d;
  --ch4: #C9B8E8; --ch4-dark: #9070d4;
  --ch5: #B8E8D0; --ch5-dark: #4daa80;
  --ch6: #FFF0A0; --ch6-dark: #c8a800;
  --ch7: #D0F0B8; --ch7-dark: #60bb30;
  --ch8: #FFD0F0; --ch8-dark: #dd70c0;
  --ch9: #D0E8FF; --ch9-dark: #5090e0;
}

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

body {
  font-family: 'Nunito', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ─── NAVIGATION ─────────────────────────────────────────────── */
.top-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  height: 64px;
  background: var(--card-bg);
  border-bottom: 2px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 200;
  box-shadow: 0 2px 12px rgba(74,69,96,0.07);
}

.nav-brand {
  font-size: 1.3rem;
  font-weight: 900;
  color: var(--text);
  white-space: nowrap;
  letter-spacing: -0.5px;
}

.nav-links {
  display: flex;
  gap: 0.2rem;
  flex-wrap: wrap;
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.45rem 0.85rem;
  border: none;
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--text-light);
  font-family: 'Nunito', sans-serif;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.nav-btn:hover  { background: var(--border); color: var(--text); }
.nav-btn.active { background: var(--pink); color: #fff; }

/* ─── VIEWS ──────────────────────────────────────────────────── */
.main-content { min-height: calc(100vh - 64px); }
.view { display: none; padding: 2rem 1.5rem; max-width: 1200px; margin: 0 auto; }
.view.active { display: block; }

/* ─── PAGE HEADER ────────────────────────────────────────────── */
.page-header { margin-bottom: 2rem; }
.page-header h1 { font-size: 2rem; font-weight: 900; color: var(--text); }
.page-header p  { color: var(--text-light); margin-top: 0.3rem; font-size: 1rem; font-weight: 600; }

/* ─── CARDS ──────────────────────────────────────────────────── */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1.5px solid var(--border);
  padding: 1.5rem;
  transition: box-shadow 0.2s, transform 0.2s;
}
.card:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

/* ─── BUTTONS ────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.4rem;
  border: none;
  border-radius: var(--radius-pill);
  font-family: 'Nunito', sans-serif;
  font-weight: 800;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.18s ease;
}
.btn-primary {
  background: linear-gradient(135deg, var(--pink-mid), var(--pink-dark));
  color: #fff;
  box-shadow: 0 4px 14px rgba(232,130,157,0.4);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 18px rgba(232,130,157,0.5); }
.btn-secondary { background: var(--border); color: var(--text); }
.btn-secondary:hover { background: var(--lavender); }
.btn-success { background: linear-gradient(135deg, var(--success), var(--success-dark)); color: #fff; }
.btn-ghost { background: transparent; color: var(--text-light); border: 2px solid var(--border); }
.btn-ghost:hover { border-color: var(--pink); color: var(--pink-dark); }
.btn-sm { padding: 0.35rem 0.85rem; font-size: 0.8rem; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none !important; }

/* ─── CHAPTER PILL / BADGE ───────────────────────────────────── */
.chapter-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}

/* ─── DASHBOARD ──────────────────────────────────────────────── */
.dash-hero {
  background: linear-gradient(135deg, #FFB3C6 0%, #C9B8E8 50%, #B8D8E8 100%);
  border-radius: var(--radius);
  padding: 2rem 2.5rem;
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.dash-hero-title { font-size: 1.9rem; font-weight: 900; color: #fff; text-shadow: 0 2px 8px rgba(0,0,0,0.15); }
.dash-hero-sub   { color: rgba(255,255,255,0.9); font-weight: 700; margin-top: 0.25rem; }

.streak-badge {
  background: rgba(255,255,255,0.3);
  border-radius: var(--radius);
  padding: 0.75rem 1.25rem;
  text-align: center;
  backdrop-filter: blur(4px);
}
.streak-num  { font-size: 2.5rem; font-weight: 900; color: #fff; line-height: 1; }
.streak-label{ font-size: 0.8rem; font-weight: 700; color: rgba(255,255,255,0.85); margin-top: 0.1rem; }

.section-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.chapter-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1.5px solid var(--border);
  padding: 1.25rem;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
  overflow: hidden;
}
.chapter-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  border-radius: var(--radius) var(--radius) 0 0;
}
.chapter-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); }

.chapter-card-emoji { font-size: 2rem; margin-bottom: 0.5rem; }
.chapter-card-title { font-size: 1rem; font-weight: 800; color: var(--text); line-height: 1.3; }
.chapter-card-progress {
  margin-top: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.progress-pip {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--border);
  transition: background 0.3s;
}
.progress-pip.done { background: var(--success); }
.progress-pip.partial { background: var(--peach); }

.weak-spot-card {
  background: linear-gradient(135deg, #fff0f5, #f8f0ff);
  border: 1.5px solid var(--pink);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 2rem;
}
.weak-spot-card h3 { font-size: 1rem; font-weight: 800; color: var(--pink-dark); margin-bottom: 0.75rem; }
.weak-spot-list { list-style: none; display: flex; flex-direction: column; gap: 0.4rem; }
.weak-spot-list li {
  display: flex; align-items: center; gap: 0.6rem;
  font-size: 0.9rem; font-weight: 700; color: var(--text);
}
.weak-spot-list li::before { content: '⚠️'; }

/* ─── SUMMARIES ──────────────────────────────────────────────── */
.summary-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1.5px solid var(--border);
  overflow: hidden;
  margin-bottom: 1rem;
}
.summary-header {
  display: flex; align-items: center; gap: 0.75rem;
  padding: 1.1rem 1.5rem;
  cursor: pointer;
  transition: background 0.2s;
  user-select: none;
}
.summary-header:hover { background: var(--bg); }
.summary-header-emoji { font-size: 1.6rem; }
.summary-header-title { font-size: 1.05rem; font-weight: 800; flex: 1; }
.summary-header-arrow { font-size: 1rem; color: var(--text-light); transition: transform 0.3s; }
.summary-card.open .summary-header-arrow { transform: rotate(180deg); }
.summary-body {
  display: none;
  padding: 0 1.5rem 1.5rem;
  color: var(--text);
  line-height: 1.7;
  font-size: 0.95rem;
}
.summary-card.open .summary-body { display: block; }
.summary-body p { margin-bottom: 0.75rem; }
.summary-body p:last-child { margin-bottom: 0; }

/* ─── KEY TERMS ──────────────────────────────────────────────── */
.terms-controls {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  align-items: center;
}

.chapter-select {
  padding: 0.5rem 1rem;
  border-radius: var(--radius-pill);
  border: 2px solid var(--border);
  font-family: 'Nunito', sans-serif;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text);
  background: var(--card-bg);
  cursor: pointer;
  transition: border-color 0.2s;
}
.chapter-select:focus { outline: none; border-color: var(--pink); }

.terms-stats {
  margin-left: auto;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-light);
}

.flashcard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}

/* 3-D flip card */
.flashcard {
  height: 160px;
  perspective: 1000px;
  cursor: pointer;
}
.flashcard-inner {
  position: relative;
  width: 100%; height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.45s cubic-bezier(0.4, 0.2, 0.2, 1);
}
.flashcard.flipped .flashcard-inner { transform: rotateY(180deg); }

.flashcard-front, .flashcard-back {
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  text-align: center;
  border: 1.5px solid var(--border);
  box-shadow: var(--shadow);
}
.flashcard-front {
  background: var(--card-bg);
}
.flashcard-back {
  background: linear-gradient(135deg, #fff0f5, #f0eeff);
  transform: rotateY(180deg);
}
.flashcard-term { font-size: 1.05rem; font-weight: 900; color: var(--text); }
.flashcard-hint { font-size: 0.72rem; font-weight: 600; color: var(--text-muted); margin-top: 0.5rem; }
.flashcard-def  { font-size: 0.82rem; font-weight: 700; color: var(--text); line-height: 1.4; }

.flashcard-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.6rem;
}
.fc-btn {
  flex: 1;
  padding: 0.25rem 0.5rem;
  border: none;
  border-radius: var(--radius-pill);
  font-family: 'Nunito', sans-serif;
  font-weight: 700;
  font-size: 0.72rem;
  cursor: pointer;
  transition: all 0.15s;
}
.fc-btn-got  { background: var(--success); color: #fff; }
.fc-btn-got:hover { background: var(--success-dark); }
.fc-btn-learn { background: var(--peach); color: var(--text); }
.fc-btn-learn:hover { background: #ffc08a; }

.flashcard.status-got .flashcard-front  { border-color: var(--success); box-shadow: 0 0 0 2px var(--success); }
.flashcard.status-learning .flashcard-front { border-color: var(--peach); box-shadow: 0 0 0 2px var(--peach); }

/* ── Terms mode toggle ──────────────────────────────────────── */
.terms-mode-toggle { display: flex; gap: 0.35rem; }
.terms-mode-btn {
  padding: 0.4rem 0.9rem; border-radius: var(--radius-sm);
  border: 2px solid var(--border); background: var(--card-bg);
  font-family: var(--font); font-weight: 700; font-size: 0.82rem;
  cursor: pointer; color: var(--text-light); transition: all .15s;
}
.terms-mode-btn.active { border-color: var(--lavender); background: var(--lavender); color: var(--text); }
.terms-mode-btn:hover:not(.active) { border-color: var(--pink); }

/* ── One-by-one deck ────────────────────────────────────────── */
.fc-deck-container { max-width: 480px; margin: 0 auto; padding: 0 1rem 2rem; }
.fc-deck-topbar {
  display: flex; align-items: center; gap: 0.6rem;
  margin-bottom: 0.75rem;
}
.fc-deck-counter { font-weight: 900; font-size: 0.9rem; min-width: 3.5rem; }
.fc-deck-prog-wrap { flex: 1; height: 6px; background: var(--border); border-radius: 99px; overflow: hidden; }
.fc-deck-prog-fill { height: 100%; background: linear-gradient(90deg, var(--pink), var(--lavender)); border-radius: 99px; transition: width 0.3s; }
.fc-stat-got  { font-size: 0.78rem; font-weight: 700; color: var(--success-dark); white-space: nowrap; }
.fc-stat-learn{ font-size: 0.78rem; font-weight: 700; color: var(--pink-dark);    white-space: nowrap; }
.fc-deck-opts { display: flex; gap: 0.5rem; margin-bottom: 1.25rem; flex-wrap: wrap; }
.fc-opt-btn {
  padding: 0.35rem 0.85rem; border-radius: 99px;
  border: 2px solid var(--border); background: var(--card-bg);
  font-family: var(--font); font-size: 0.78rem; font-weight: 700;
  cursor: pointer; color: var(--text-light); transition: all .15s;
}
.fc-opt-btn:hover { border-color: var(--lavender); }
.fc-opt-active { border-color: var(--lavender) !important; background: var(--lavender) !important; color: var(--text) !important; }

/* Card area */
.fc-deck-area {
  position: relative; height: 280px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 1.5rem;
}
.fc-swipe-hint {
  position: absolute; top: 50%; transform: translateY(-50%);
  font-weight: 900; font-size: 0.85rem; opacity: 0;
  pointer-events: none; z-index: 10;
  padding: 0.4rem 0.9rem; border-radius: var(--radius-sm);
  transition: opacity 0.08s;
}
.fc-hint-left  { left: 0;  color: #dc2626; background: #fff1f1; }
.fc-hint-right { right: 0; color: #16a34a; background: #f0fdf4; }

/* The card itself */
.fc-deck-card {
  width: 100%; max-width: 400px; height: 240px;
  cursor: pointer; user-select: none;
  touch-action: none;
  will-change: transform;
  border-radius: var(--radius);
}
.fc-deck-card-inner {
  width: 100%; height: 100%;
  position: relative; transform-style: preserve-3d;
  transition: transform 0.4s;
}
.fc-deck-card.flipped .fc-deck-card-inner { transform: rotateY(180deg); }
.fc-deck-card-front,
.fc-deck-card-back {
  position: absolute; inset: 0; backface-visibility: hidden;
  border-radius: var(--radius); border: 2px solid var(--lavender);
  background: var(--card-bg); box-shadow: var(--shadow);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 1.75rem; text-align: center; gap: 0.5rem;
}
.fc-deck-card-back {
  transform: rotateY(180deg);
  background: linear-gradient(135deg, var(--bg), #f0eeff);
}
.fc-deck-card.fc-card-got_it .fc-deck-card-front  { border-color: #86efac; }
.fc-deck-card.fc-card-learning .fc-deck-card-front { border-color: var(--pink); }
.fc-deck-card-term { font-size: 1.45rem; font-weight: 900; color: var(--text); line-height: 1.3; }
.fc-deck-card-tap  { font-size: 0.75rem; color: var(--text-light); font-weight: 600; }
.fc-deck-card-def  { font-size: 0.98rem; font-weight: 600; color: var(--text); line-height: 1.6; }

/* Action buttons */
.fc-deck-btns { display: flex; gap: 0.6rem; justify-content: center; }
.fc-btn-action {
  flex: 1; max-width: 130px;
  display: flex; flex-direction: column; align-items: center; gap: 0.25rem;
  padding: 0.7rem 0.4rem; border-radius: var(--radius);
  border: 2px solid var(--border); background: var(--card-bg);
  cursor: pointer; font-family: var(--font); font-weight: 700;
  font-size: 0.78rem; color: var(--text-light); transition: all .15s;
}
.fc-btn-icon { font-size: 1.25rem; }
.fc-btn-action:hover:not(:disabled) { transform: translateY(-2px); box-shadow: var(--shadow); }
.fc-btn-learn:hover { border-color: #fca5a5 !important; color: #dc2626 !important; background: #fff1f1; }
.fc-btn-got:hover   { border-color: #86efac !important; color: #16a34a !important; background: #f0fdf4; }
.fc-btn-action:disabled { opacity: 0.3; cursor: not-allowed; }

/* End screen */
.fc-deck-end { text-align: center; padding: 3rem 1rem; max-width: 420px; margin: 0 auto; }
.fc-deck-end-emoji { font-size: 3.5rem; margin-bottom: 0.5rem; }
.fc-deck-end-stats  { display: flex; gap: 1rem; justify-content: center; margin: 1.25rem 0 1.75rem; flex-wrap: wrap; }
.fc-end-stat { padding: 0.5rem 1.25rem; border-radius: var(--radius); font-weight: 700; font-size: 0.95rem; }
.fc-end-got  { background: #f0fdf4; color: #16a34a; }
.fc-end-learn{ background: #fff1f1; color: #dc2626; }
.fc-deck-end-actions { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }

@keyframes fc-pulse-red {
  0%, 100% { box-shadow: 0 0 12px 3px #ef444455, 0 0 0 2px #ef4444; }
  50%       { box-shadow: 0 0 28px 8px #ef444488, 0 0 0 3px #ef4444; }
}
@keyframes fc-pulse-green {
  0%, 100% { box-shadow: 0 0 12px 3px #22c55e55, 0 0 0 2px #22c55e; }
  50%       { box-shadow: 0 0 28px 8px #22c55e88, 0 0 0 3px #22c55e; }
}
.fc-glow-red   { animation: fc-pulse-red   0.7s ease-in-out infinite; }
.fc-glow-green { animation: fc-pulse-green 0.7s ease-in-out infinite; }
.fc-glow-red   .fc-deck-card-front { border-color: #ef4444; }
.fc-glow-green .fc-deck-card-front { border-color: #22c55e; }

/* ─── MATCHING GAME ──────────────────────────────────────────── */
.matching-setup {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}
.matching-setup h2 { font-size: 1.5rem; font-weight: 900; margin-bottom: 0.5rem; }
.matching-setup p  { color: var(--text-light); margin-bottom: 1.5rem; }

.matching-board {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
  margin-bottom: 1.5rem;
}

.match-item {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border);
  background: var(--card-bg);
  font-weight: 700;
  font-size: 0.88rem;
  cursor: pointer;
  transition: all 0.18s;
  text-align: center;
  line-height: 1.3;
  min-height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.match-item:hover:not(.matched):not(.disabled) {
  border-color: var(--pink); background: #fff0f5;
}
.match-item.selected { border-color: var(--pink-dark); background: var(--pink); color: #fff; }
.match-item.matched  { border-color: var(--success); background: #eaffef; color: var(--success-dark); cursor: default; }
.match-item.wrong    { border-color: var(--error-dark); background: var(--error); animation: shake 0.4s; }
.match-item.disabled { opacity: 0.4; cursor: default; }

@keyframes shake {
  0%,100%{ transform: translateX(0); }
  25%    { transform: translateX(-6px); }
  75%    { transform: translateX(6px); }
}

.match-stats {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--text);
  margin-bottom: 1.5rem;
}

/* ─── QUIZ ───────────────────────────────────────────────────── */
.quiz-setup { max-width: 700px; margin: 0 auto; }
.quiz-chapter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}
.quiz-chapter-btn {
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border);
  background: var(--card-bg);
  font-family: 'Nunito', sans-serif;
  font-weight: 800;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
  color: var(--text);
}
.quiz-chapter-btn:hover:not(.active) { border-color: var(--pink); }
.quiz-chapter-btn.active { border-color: var(--pink-dark); background: var(--pink); color: #fff; }

.difficulty-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}
.diff-btn {
  flex: 1;
  min-width: 120px;
  padding: 1rem;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border);
  background: var(--card-bg);
  font-family: 'Nunito', sans-serif;
  font-weight: 800;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
  text-align: center;
}
.diff-btn .diff-label { font-size: 1rem; display: block; }
.diff-btn .diff-sub   { font-size: 0.75rem; color: var(--text-light); margin-top: 0.2rem; display: block; }
.diff-btn:hover:not(.locked) { border-color: var(--pink); }
.diff-btn.locked { opacity: 0.55; cursor: not-allowed; }
.diff-btn.locked::after { content: '🔒'; position: absolute; top: 8px; right: 10px; font-size: 0.9rem; }
.diff-btn.done { border-color: var(--success); }
.diff-btn.done::after { content: '✅'; position: absolute; top: 8px; right: 10px; font-size: 0.9rem; }

.quiz-question-view { max-width: 700px; margin: 0 auto; }
.quiz-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}
.quiz-progress-bar {
  flex: 1;
  height: 8px;
  background: var(--border);
  border-radius: var(--radius-pill);
  overflow: hidden;
  min-width: 100px;
}
.quiz-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--pink), var(--lavender));
  border-radius: var(--radius-pill);
  transition: width 0.4s ease;
}
.quiz-qnum  { font-size: 0.85rem; font-weight: 800; color: var(--text-light); }
.quiz-score { font-size: 0.9rem; font-weight: 800; color: var(--text); }

.quiz-q-text {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1.5;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, #fff5f8, #f8f5ff);
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius);
  border-left: 4px solid var(--pink);
}

.options-list { display: flex; flex-direction: column; gap: 0.6rem; }
.option-btn {
  width: 100%;
  text-align: left;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border);
  background: var(--card-bg);
  font-family: 'Nunito', sans-serif;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text);
  cursor: pointer;
  transition: all 0.18s;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.option-btn .opt-letter {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--border);
  display: flex; align-items: center; justify-content: center;
  font-weight: 900; font-size: 0.82rem;
  flex-shrink: 0;
  transition: all 0.18s;
}
.option-btn:hover:not(:disabled) { border-color: var(--pink); background: #fff5f8; }
.option-btn:hover:not(:disabled) .opt-letter { background: var(--pink); color: #fff; }
.option-btn.correct { border-color: var(--success); background: #eaffef; }
.option-btn.correct .opt-letter { background: var(--success); color: #fff; }
.option-btn.wrong   { border-color: var(--error-dark); background: var(--error); }
.option-btn.wrong .opt-letter   { background: var(--error-dark); color: #fff; }
.option-btn:disabled { cursor: default; }

/* ─── QUIZ MODAL ─────────────────────────────────────────────── */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(74,69,96,0.55);
  backdrop-filter: blur(4px);
  z-index: 500;
  display: flex; align-items: center; justify-content: center;
  padding: 1rem;
}
.modal-overlay.hidden { display: none; }

.modal-box {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 2rem;
  max-width: 520px;
  width: 100%;
  text-align: center;
}
.modal-icon    { font-size: 3rem; margin-bottom: 0.75rem; }
.modal-verdict { font-size: 1.5rem; font-weight: 900; margin-bottom: 0.75rem; }
.modal-explanation {
  font-size: 0.95rem; font-weight: 600; color: var(--text-light);
  line-height: 1.6; margin-bottom: 1.5rem;
  background: var(--bg); padding: 1rem; border-radius: var(--radius-sm);
}

.end-box { max-width: 520px; }
.end-score { font-size: 3.5rem; font-weight: 900; color: var(--pink-dark); }
.end-label { font-size: 1.1rem; font-weight: 700; color: var(--text-light); margin-bottom: 1rem; }
.end-message { font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 1.5rem; line-height: 1.5; }

/* ── Quiz completion popup ─────────────────────────────────────── */
.quiz-end-wrap { text-align: center; }
.quiz-end-emoji { font-size: 3rem; margin-bottom: 0.25rem; }
.quiz-end-title { font-size: 1.5rem; font-weight: 900; color: var(--text); margin-bottom: 0.5rem; }
.quiz-end-diff-badge {
  display: inline-block; padding: 0.2rem 0.8rem;
  background: var(--lavender); border-radius: 99px;
  font-size: 0.75rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.06em; margin-bottom: 1rem;
}
.quiz-end-score-row { display: flex; align-items: baseline; justify-content: center; gap: 0.15rem; margin-bottom: 0.5rem; }
.quiz-end-score { font-size: 5rem; font-weight: 900; line-height: 1; color: var(--pink-dark); }
.quiz-end-denom { font-size: 2.25rem; font-weight: 700; color: var(--text-light); }
.quiz-end-stars { display: flex; justify-content: center; gap: 0.25rem; margin-bottom: 0.5rem; }
.quiz-end-star { font-size: 1.75rem; transition: opacity .2s; }
.quiz-end-star.dim { opacity: 0.2; filter: grayscale(1); }
.quiz-end-star.lit  { opacity: 1; }
.quiz-end-pct { font-size: 0.95rem; font-weight: 700; color: var(--text-light); margin-bottom: 0.4rem; }
.quiz-end-msg { font-size: 0.9rem; color: var(--text-light); font-weight: 600; line-height: 1.5; margin-bottom: 1.75rem; }
.quiz-end-actions { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }

/* ─── PROGRESS ───────────────────────────────────────────────── */
.progress-chapter {
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1.5px solid var(--border);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
}
.progress-chapter-header {
  display: flex; align-items: center; gap: 0.75rem;
  margin-bottom: 1rem;
}
.progress-chapter-header .ch-emoji { font-size: 1.5rem; }
.progress-chapter-header .ch-title { font-weight: 800; font-size: 1rem; flex: 1; }
.diff-bar-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.5rem; }
.diff-bar-label { width: 60px; font-size: 0.8rem; font-weight: 700; color: var(--text-light); }
.diff-bar-track { flex: 1; height: 10px; background: var(--border); border-radius: var(--radius-pill); overflow: hidden; }
.diff-bar-fill  { height: 100%; border-radius: var(--radius-pill); transition: width 0.6s ease; }
.fill-easy   { background: linear-gradient(90deg, #a8e6cf, #3faa60); }
.fill-medium { background: linear-gradient(90deg, #ffd89b, #e8a800); }
.fill-hard   { background: linear-gradient(90deg, #ffb3c6, #e8329d); }
.diff-bar-score { width: 50px; font-size: 0.8rem; font-weight: 800; text-align: right; }

.heatmap-title { font-size: 1.1rem; font-weight: 800; margin: 2rem 0 1rem; }
.heatmap-grid { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.heatmap-cell {
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 700;
  background: var(--border);
  color: var(--text-light);
  transition: all 0.3s;
}
.heatmap-cell.weak-1 { background: #ffe0b2; color: #e65100; }
.heatmap-cell.weak-2 { background: #ffb3b3; color: #c62828; }
.heatmap-cell.weak-3 { background: #ff7a7a; color: #fff; }

/* ─── GAMES HUB ──────────────────────────────────────────────── */
.games-hub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.game-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1.5px solid var(--border);
  padding: 1.75rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
}
.game-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); border-color: var(--pink); }
.game-card-disabled { opacity: 0.45; cursor: not-allowed; }
.game-card-disabled:hover { box-shadow: var(--shadow); transform: none; border-color: var(--border); }
.game-card-icon  { font-size: 3rem; margin-bottom: 0.75rem; }
.game-card-title { font-size: 1.1rem; font-weight: 900; margin-bottom: 0.3rem; }
.game-card-desc  { font-size: 0.82rem; font-weight: 600; color: var(--text-light); line-height: 1.4; }
.game-card-hs    { margin-top: 0.75rem; font-size: 0.78rem; font-weight: 700; color: var(--pink-dark); }

/* ─── GAME: BLOCK BLAST ──────────────────────────────────────── */
#game-blockblast { display: none; }
.bb-layout {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
}
.bb-board-wrap {
  position: relative;
  will-change: transform;  /* own compositing layer — isolates filter repaints */
}
.bb-board {
  display: grid;
  grid-template-columns: repeat(8, 50px);
  grid-template-rows: repeat(8, 50px);
  gap: 2px;
  background: var(--border);
  border-radius: var(--radius-sm);
  padding: 4px;
  border: 2px solid var(--lavender);
}
.bb-cell {
  width: 50px; height: 50px;
  border-radius: 7px;
  background: var(--bg);
  transition: background 0.15s, transform 0.15s, box-shadow 0.15s;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.55rem; font-weight: 700; color: rgba(255,255,255,0.7);
  overflow: hidden;
  position: relative;
  /* subtle recessed look for empty cells */
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.07), inset 0 -1px 2px rgba(255,255,255,0.6);
}
.bb-cell.filled {
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.8);   /* hairline top edge highlight */
}
/* smooth light-to-shadow gradient — no hard bands */
.bb-cell.filled::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(150deg,
    rgba(255,255,255,0.40) 0%,
    rgba(255,255,255,0.08) 42%,
    rgba(0,0,0,0.0)        55%,
    rgba(0,0,0,0.20)      100%
  );
  border-radius: inherit;
  pointer-events: none;
}
/* suppress shine on drop-state cells so the highlight colors read cleanly */
.bb-cell.drop-ok::before,
.bb-cell.drop-bad::before,
.bb-cell.drop-clear::before { display: none; }
.bb-cell.preview { opacity: 0.5; }
/* board + glossary side-by-side row */
.bb-center-row {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: 1rem;
}
/* board, pieces, controls stacked in a column */
.bb-board-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}
/* score + best centered above the board */
.bb-score-area {
  display: flex;
  flex-direction: row;
  gap: 1.5rem;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
}
/* buttons row centered below the pieces */
.bb-controls {
  display: flex;
  flex-direction: row;
  gap: 0.75rem;
  align-items: center;
  justify-content: center;
  position: relative;   /* own stacking layer — sits above board's will-change:transform context */
  z-index: 1;
}
.bb-score-box {
  background: linear-gradient(135deg, var(--pink), var(--lavender));
  border-radius: var(--radius);
  padding: 1rem 1.5rem;
  text-align: center;
  color: #fff;
  min-width: 140px;
}
.bb-score-num {
  font-size: 2rem; font-weight: 900;
  display: block; transform-origin: center;
  transition: text-shadow 0.15s;
}
.bb-score-num.bb-score-counting {
  text-shadow:
    0 0 10px rgba(255,255,255,1),
    0 0 24px rgba(255,230,80,0.85),
    0 0 48px rgba(255,190,0,0.45);
}
.bb-score-label { font-size: 0.75rem; font-weight: 700; opacity: 0.85; }
.bb-pieces {
  display: flex;
  flex-direction: row;
  gap: 1rem;
  align-items: flex-start;
  justify-content: center;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}
.bb-piece-wrap {
  background: var(--card-bg);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.5rem;
  cursor: grab;
  transition: all 0.2s;
  min-width: 90px;
  display: flex;
  flex-direction: column;
  align-items: center;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}
.bb-piece-wrap:hover { border-color: var(--pink); box-shadow: var(--shadow-hover); }
.bb-piece-wrap.dragging { opacity: 0.4; }
.bb-piece-wrap.used { opacity: 0.2; cursor: default; }
.bb-piece-placeholder {
  border: 1.5px dashed var(--purple) !important;
  cursor: default;
  animation: bb-choice-pulse 1.6s ease-in-out infinite;
}
.bb-piece-placeholder:hover { border-color: var(--purple) !important; box-shadow: none; }
.bb-piece-placeholder-slot {
  display: flex; align-items: center; justify-content: center;
  height: 54px; font-size: 2rem; color: var(--purple); opacity: 0.55;
}
.bb-piece-label { font-size: 0.62rem; font-weight: 700; color: var(--text-light); margin-bottom: 0.3rem; text-align: center; max-width: 110px; }
.bb-piece-grid  { display: inline-grid; gap: 2px; }
.bb-piece-cell {
  width: 18px; height: 18px; border-radius: 3px;
  position: relative; overflow: hidden;
}
.bb-piece-cell:not(.empty) {
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.8),
    0 2px 6px rgba(0,0,0,0.2),
    0 1px 2px rgba(0,0,0,0.13);
}
.bb-piece-cell:not(.empty)::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(150deg,
    rgba(255,255,255,0.40) 0%,
    rgba(255,255,255,0.08) 42%,
    rgba(0,0,0,0.0)        55%,
    rgba(0,0,0,0.20)      100%
  );
  border-radius: inherit;
  pointer-events: none;
}

.bb-def-flash {
  position: fixed;
  bottom: 2rem; left: 50%; transform: translateX(-50%);
  background: var(--text);
  color: #fff;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 0.9rem;
  z-index: 300;
  opacity: 0;
  pointer-events: none;   /* never intercept clicks — it's display-only */
  transition: opacity 0.3s;
  max-width: 90vw;
  text-align: center;
}
.bb-def-flash.show { opacity: 1; }

.bb-drag-ghost {
  position: fixed;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.75;
  transform: translate(-50%, -50%);
  display: inline-grid;
  gap: 2px;
}
.bb-drag-ghost .bb-piece-cell {
  width: 50px; height: 50px; border-radius: 7px;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.8),
    0 4px 10px rgba(0,0,0,0.25),
    0 1px 3px rgba(0,0,0,0.15);
}
.bb-drag-ghost .bb-piece-cell.empty { background: transparent !important; box-shadow: none; }

.bb-cell.drop-ok   { background: var(--drop-color, rgba(150,140,220,0.3)) !important; }
.bb-cell.drop-bad  { outline: 2px solid #f44336; background: rgba(244,67,54,0.10) !important; }
.bb-cell.drop-clear { animation: bb-drop-clear-pulse 0.6s ease-in-out infinite; }
@keyframes bb-drop-clear-pulse {
  0%, 100% { background: rgba(255,210,40,0.22) !important; box-shadow: inset 0 0 0 2px rgba(255,185,0,0.45), 0 0 7px rgba(255,200,0,0.35); }
  50%       { background: rgba(255,210,40,0.52) !important; box-shadow: inset 0 0 0 2px rgba(255,185,0,0.95), 0 0 18px rgba(255,200,0,0.75); }
}
/* ── Combo streak announcements ─────────────────────────────── */
.bb-combo-banner {
  position: fixed;
  top: 32%;
  left: 50%;
  transform: translateX(-50%);
  z-index: 9100;
  text-align: center;
  pointer-events: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  font-weight: 900;
  font-family: var(--font-head);
  letter-spacing: 0.03em;
  line-height: 1;
  color: var(--combo-color, #ffd93d);
  text-shadow: 0 0 24px var(--combo-color, #ffd93d), 0 2px 6px rgba(0,0,0,0.55);
  animation: bb-combo-pop 1.9s cubic-bezier(0.34,1.28,0.64,1) forwards;
}
.bb-combo-shake {
  animation: bb-combo-pop-shake 1.9s cubic-bezier(0.34,1.28,0.64,1) forwards;
}
.bb-combo-text  { display: block; }
.bb-combo-mult  { font-size: 0.38em; opacity: 0.88; font-weight: 700; letter-spacing: 0.06em; }

@keyframes bb-combo-pop {
  0%   { transform: translateX(-50%) scale(0.35);            opacity: 0; }
  18%  { transform: translateX(-50%) scale(1.18);            opacity: 1; }
  28%  { transform: translateX(-50%) scale(0.94);            opacity: 1; }
  38%  { transform: translateX(-50%) scale(1.04);            opacity: 1; }
  50%  { transform: translateX(-50%) scale(1.0);             opacity: 1; }
  72%  { transform: translateX(-50%) scale(1.0) translateY(0);   opacity: 1; }
  100% { transform: translateX(-50%) scale(1.0) translateY(-28px); opacity: 0; }
}
@keyframes bb-combo-pop-shake {
  0%   { transform: translateX(-50%) scale(0.35);                    opacity: 0; }
  15%  { transform: translateX(calc(-50% - 6px)) scale(1.22);        opacity: 1; }
  22%  { transform: translateX(calc(-50% + 6px)) scale(1.18);        opacity: 1; }
  28%  { transform: translateX(calc(-50% - 4px)) scale(1.08);        opacity: 1; }
  34%  { transform: translateX(-50%) scale(1.02);                    opacity: 1; }
  50%  { transform: translateX(-50%) scale(1.0);                     opacity: 1; }
  72%  { transform: translateX(-50%) scale(1.0) translateY(0);       opacity: 1; }
  100% { transform: translateX(-50%) scale(1.0) translateY(-28px);   opacity: 0; }
}
@keyframes bb-combo-flash {
  0%   { opacity: 0.10; }
  30%  { opacity: 0.15; }
  100% { opacity: 0;    }
}

/* ── Quiz correct confetti ──────────────────────────────────── */
@keyframes bb-confetti-fall {
  0%   { transform: translateY(0)     translateX(0)            rotate(var(--r0)); opacity: 1;   }
  80%  { opacity: 1; }
  100% { transform: translateY(108vh) translateX(var(--drift)) rotate(var(--r1)); opacity: 0;   }
}

/* ── Piece placement sparks ─────────────────────────────────── */
@keyframes bb-spark {
  0%   { transform: translate(0,0) scale(1);   opacity: 0.95; }
  65%  { opacity: 0.65; }
  100% { transform: translate(var(--sx,0px),var(--sy,20px)) scale(0); opacity: 0; }
}

/* ── Block Blast clear animations ───────────────────────────── */
.bb-clearing { pointer-events: none; position: relative; z-index: 2; }

@keyframes bb-flash-collapse {
  0%   { transform: scale(1); }
  20%  { transform: scale(1.25); background: #fff !important; filter: brightness(5); box-shadow: 0 0 14px 6px rgba(255,255,255,0.95); }
  100% { transform: scale(0); opacity: 0; box-shadow: none; }
}
.bb-clearing-flash { animation: bb-flash-collapse 0.36s ease-in forwards; }

@keyframes bb-ripple-pop {
  0%   { transform: scale(1); opacity: 1; }
  35%  { transform: scale(1.4); filter: brightness(4) saturate(2); box-shadow: 0 0 10px 4px rgba(255,255,255,0.8); }
  100% { transform: scale(0); opacity: 0; filter: none; box-shadow: none; }
}
.bb-clearing-wave { animation: bb-ripple-pop 0.32s ease-in forwards; }

@keyframes bb-color-burst {
  0%   { transform: scale(1); opacity: 1; filter: saturate(1) blur(0px); }
  30%  { transform: scale(1.2); filter: saturate(7) brightness(2.8) blur(0px); box-shadow: 0 0 18px 7px rgba(255,240,80,0.7); }
  100% { transform: scale(1.4); opacity: 0; filter: saturate(0) blur(8px); box-shadow: none; }
}
.bb-clearing-burst { animation: bb-color-burst 0.44s ease-out forwards; }

@keyframes bb-gravity-tumble {
  0%   { transform: translateY(0) translateX(0) rotate(0deg) scale(1); opacity: 1; filter: brightness(1.8); }
  12%  { transform: translateY(-10px) translateX(0) rotate(calc(var(--rot) * 0.15deg)) scale(1.15); opacity: 1; filter: brightness(3); }
  100% { transform: translateY(420px) translateX(calc(var(--drift) * 1px)) rotate(calc(var(--rot) * 1deg)) scale(0.6); opacity: 0; }
}
.bb-clearing-tumble { animation: bb-gravity-tumble 0.55s cubic-bezier(0.4,0,1,1) forwards; }

@keyframes bb-scatter-explosion {
  0%   { transform: translate(0,0) scale(1) rotate(0deg); opacity: 1; filter: brightness(3) saturate(2); }
  18%  { transform: translate(calc(var(--dx)*0.25px),calc(var(--dy)*0.25px)) scale(1.35) rotate(calc(var(--rot)*0.25deg)); opacity: 1; }
  100% { transform: translate(calc(var(--dx)*1px),calc(var(--dy)*1px)) scale(0.15) rotate(calc(var(--rot)*1deg)); opacity: 0; filter: brightness(1) saturate(1); }
}
.bb-clearing-scatter { animation: bb-scatter-explosion 0.5s ease-out forwards; }

@keyframes bb-slingshot-launch {
  0%   { transform: scaleY(1) scaleX(1) translateY(0); opacity: 1; }
  18%  { transform: scaleY(0.45) scaleX(1.4) translateY(5px); filter: brightness(2.5); }
  30%  { transform: scaleY(1.7) scaleX(0.65) translateY(-8px); }
  100% { transform: scaleY(0.2) scaleX(0.4) translateY(-440px); opacity: 0; }
}
.bb-clearing-slingshot { animation: bb-slingshot-launch 0.5s cubic-bezier(0.2,0,0.6,1) forwards; }
/* ────────────────────────────────────────────────────────────── */

.bb-piece-cat { font-size: 0.62rem; font-weight: 700; margin-bottom: 0.2rem; text-align: center; }
.bb-hs-line { font-size: .75rem; font-weight: 700; color: var(--text-light); text-align: center; }

.bb-quiz-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.55);
  display: flex; align-items: center; justify-content: center;
  z-index: 500;
}
.bb-quiz-modal-overlay {
  animation: bb-quiz-overlay-in 0.28s ease forwards;
}
@keyframes bb-quiz-overlay-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}
.bb-quiz-box {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 1.75rem;
  max-width: 480px; width: 90%;
  box-shadow: var(--shadow-hover);
  text-align: center;
  animation: bb-quiz-enter 0.46s cubic-bezier(0.34, 1.28, 0.64, 1) both;
}
@keyframes bb-quiz-enter {
  from { transform: translateY(55vh) scale(0.84); opacity: 0; }
  to   { transform: translateY(0)    scale(1);    opacity: 1; }
}
.bb-hs-overlay {
  z-index: 9500;
  background: rgba(0,0,0,0.62);
  backdrop-filter: blur(2px);
}
.bb-hs-box {
  background: var(--card-bg);
  border: 2px solid var(--pink);
  border-radius: var(--radius);
  padding: 1.4rem 1.2rem;
  width: min(92vw, 380px);
  text-align: center;
  box-shadow: 0 10px 28px rgba(74,69,96,0.22);
  animation:
    bb-hs-enter 0.36s cubic-bezier(0.34, 1.28, 0.64, 1) both,
    bb-hs-pulse 1.2s ease-in-out 0.36s infinite,
    bb-hs-glow 1.2s ease-in-out 0.36s infinite;
}
.bb-hs-icon {
  font-size: 2.4rem;
  line-height: 1;
  margin-bottom: 0.35rem;
}
.bb-hs-title {
  font-size: 1.35rem;
  font-weight: 900;
  color: var(--pink-dark);
}
.bb-hs-score {
  font-size: 2.35rem;
  font-weight: 900;
  color: var(--text);
  margin: 0.25rem 0 0.2rem;
}
.bb-hs-sub {
  font-size: 0.86rem;
  color: var(--text-light);
  margin-bottom: 0.95rem;
}
.bb-hs-actions {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
@keyframes bb-hs-enter {
  from { transform: translateY(40px) scale(0.86); opacity: 0; }
  to   { transform: translateY(0) scale(1); opacity: 1; }
}
@keyframes bb-hs-pulse {
  0%, 100% { transform: scale(1); }
  50%      { transform: scale(1.03); }
}
@keyframes bb-hs-glow {
  0%, 100% { box-shadow: 0 10px 28px rgba(74,69,96,0.22), 0 0 0 0 rgba(232,130,157,0.18); }
  50%      { box-shadow: 0 14px 32px rgba(74,69,96,0.30), 0 0 30px 6px rgba(232,130,157,0.45); }
}
.bb-quiz-q { font-size: 1rem; font-weight: 700; margin-bottom: 1rem; line-height: 1.4; }
.bb-quiz-opts { display: flex; flex-direction: column; gap: .5rem; margin-bottom: 1rem; }
.bb-quiz-opt { padding: .65rem 1rem; border-radius: var(--radius); border: 2px solid var(--border); background: var(--bg); cursor: pointer; text-align: left; font-size: .9rem; transition: border-color .15s; }
.bb-quiz-opt:hover { border-color: var(--pink); }
.bb-quiz-opt.correct { border-color: #4CAF50; background: rgba(76,175,80,0.1); }
.bb-quiz-opt.wrong   { border-color: #f44336; background: rgba(244,67,54,0.08); }
.bb-quiz-exp { font-size: .85rem; color: var(--text-light); margin-bottom: 1rem; line-height: 1.5; }
.bb-piece-choice { display: flex; flex-direction: column; gap: 0.5rem; margin: 0.75rem 0; }
.bb-piece-option { cursor: pointer; padding: 0.5rem 0.7rem; border-radius: var(--radius); border: 2px solid var(--border); background: var(--bg); transition: border-color .15s, transform .15s; display: flex; align-items: center; gap: 0.65rem; text-align: left; }
.bb-piece-option:hover { border-color: var(--pink); transform: translateX(3px); }

/* ── Piece choice box: enters over board then slides to right sidebar ── */
.bb-piece-choice-box {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  width: 260px;
  max-width: 260px;
  box-shadow: var(--shadow-hover);
  text-align: center;
  animation: bb-choice-enter 0.42s cubic-bezier(0.34,1.18,0.64,1) forwards;
  will-change: transform;
}
@keyframes bb-choice-enter {
  from { transform: translateY(-44px) scale(0.96); opacity: 0; }
  to   { transform: translateY(0) scale(1); opacity: 1; }
}
@keyframes bb-choice-pulse {
  0%   { box-shadow: 0 0 0 0 rgba(201,184,232,0.85), 0 0 28px rgba(201,184,232,0.35); }
  45%  { box-shadow: 0 0 0 14px rgba(201,184,232,0.18), 0 0 36px rgba(201,184,232,0.55); }
  100% { box-shadow: 0 0 0 26px rgba(201,184,232,0), 0 0 20px rgba(201,184,232,0.12); }
}
.bb-piece-choice-box.pulsing {
  animation: bb-choice-pulse 0.85s ease-out forwards;
}

.bb-glossary-btn {
  padding: .5rem 1rem; border-radius: var(--radius);
  border: 2px solid var(--lavender); background: var(--card-bg);
  cursor: pointer; font-weight: 700; font-size: .85rem;
  transition: border-color .15s;
}
.bb-glossary-btn:hover { border-color: var(--pink); }

.bb-glossary-panel {
  position: relative;
  background: var(--card-bg);
  border-radius: var(--radius); padding: 1rem;
  width: 220px; min-width: 200px;
  max-height: 520px; overflow-y: auto;
  border: 2px solid var(--lavender);
}
.bb-glossary-panel.hidden { display: none; }
.bb-glossary-close {
  position: absolute; top: 0.5rem; right: 0.5rem;
  width: 1.35rem; height: 1.35rem; border-radius: 50%;
  background: #ef4444; color: #fff; border: none; cursor: pointer;
  font-size: 0.7rem; font-weight: 900;
  display: flex; align-items: center; justify-content: center;
  line-height: 1; transition: background .15s;
}
.bb-glossary-close:hover { background: #dc2626; }
.bb-glossary-header { font-weight: 800; font-size: 1rem; margin-bottom: .75rem; padding-right: 1.6rem; }
.bb-glossary-cat { margin-bottom: 1rem; }
.bb-glossary-cat-title { font-weight: 700; font-size: .8rem; margin-bottom: .4rem; }
.bb-glossary-entry { margin-bottom: .5rem; }
.bb-glossary-term { font-weight: 700; font-size: .85rem; }
.bb-glossary-def { font-size: .8rem; color: var(--text-light); line-height: 1.4; }
.bb-glossary-empty { font-size: .85rem; color: var(--text-light); text-align: center; padding: 1rem; }

/* ─── GAME: WORD SEARCH ──────────────────────────────────────── */
#game-wordsearch { display: none; }
.ws-layout {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  justify-content: center;
  align-items: flex-start;
}
.ws-grid-wrap { user-select: none; -webkit-user-select: none; }
.ws-grid {
  display: inline-grid;
  gap: 2px;
  background: var(--border);
  border-radius: var(--radius-sm);
  padding: 4px;
  touch-action: none;
}
.ws-cell {
  width: 34px; height: 34px;
  border-radius: 4px;
  background: var(--card-bg);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 1rem;
  cursor: pointer;
  transition: background 0.1s, color 0.1s;
  color: var(--text);
}
.ws-cell.selecting { background: var(--pink); color: #fff; }
.ws-cell.found-0   { background: #FFB3C6; color: var(--text); }
.ws-cell.found-1   { background: #C9B8E8; color: var(--text); }
.ws-cell.found-2   { background: #B8E8D0; color: var(--text); }
.ws-cell.found-3   { background: #FFD5B8; color: var(--text); }
.ws-cell.found-4   { background: #B8D8E8; color: var(--text); }
.ws-cell.found-5   { background: #FFF0A0; color: var(--text); }
.ws-cell.found-6   { background: #D0F0B8; color: var(--text); }
.ws-cell.found-7   { background: #FFD0F0; color: var(--text); }

.ws-sidebar { min-width: 200px; }
.ws-word-list { list-style: none; display: flex; flex-direction: column; gap: 0.4rem; }
.ws-word-list li {
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 0.88rem;
  background: var(--border);
  transition: all 0.3s;
}
.ws-word-list li.found { text-decoration: line-through; color: var(--text-muted); background: #eaffef; }
.ws-timer { font-size: 1.3rem; font-weight: 900; color: var(--text); margin-bottom: 1rem; }
.ws-def-panel {
  margin-top: 1rem;
  padding: 0.75rem;
  background: var(--bg);
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
  min-height: 60px;
  line-height: 1.5;
}

/* ─── GAME: SPEED SORT ───────────────────────────────────────── */
#game-speedsort { display: none; }
.ss-layout {
  max-width: 700px;
  margin: 0 auto;
}
.ss-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.ss-timer-wrap { position: relative; display: inline-flex; align-items: center; gap: 0.5rem; }
.ss-timer { font-size: 1.6rem; font-weight: 900; color: var(--text); }
.ss-timer.urgent { color: var(--error-dark); animation: pulse 0.6s infinite; }
.ss-score { font-size: 1.2rem; font-weight: 900; color: var(--pink-dark); }

@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.5} }

.ss-card-area {
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}
.ss-term-card {
  background: linear-gradient(135deg, var(--pink), var(--lavender));
  color: #fff;
  padding: 1.25rem 2rem;
  border-radius: var(--radius);
  font-size: 1.2rem;
  font-weight: 900;
  text-align: center;
  box-shadow: var(--shadow-lg);
  animation: slide-in 0.25s ease;
  max-width: 400px;
}
@keyframes slide-in { from { opacity:0; transform:translateY(-20px); } to { opacity:1; transform:translateY(0); } }

.ss-bins {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}
.ss-bin {
  flex: 1;
  min-width: 160px;
  min-height: 80px;
  border-radius: var(--radius);
  border: 3px dashed var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  cursor: pointer;
  transition: all 0.2s;
  padding: 1rem;
  background: var(--card-bg);
}
.ss-bin:hover { border-color: var(--pink); background: #fff5f8; transform: scale(1.02); }
.ss-bin.correct-flash { background: #eaffef; border-color: var(--success); animation: flash-green 0.4s; }
.ss-bin.wrong-flash   { background: var(--error); border-color: var(--error-dark); animation: flash-red 0.4s; }
@keyframes flash-green { 0%,100%{} 50%{background:#b8ffcc;} }
@keyframes flash-red   { 0%,100%{} 50%{background:#ffcccc;} }
.ss-bin-icon  { font-size: 1.8rem; }
.ss-bin-label { font-size: 0.9rem; font-weight: 800; color: var(--text); text-align: center; }
.ss-feedback  { margin-top: 0.5rem; font-size: 0.78rem; font-weight: 700; color: var(--text-light); text-align: center; }

/* ─── GAME: RAPID FIRE ───────────────────────────────────────── */
#game-rapidfire { display: none; }
.rf-layout { max-width: 600px; margin: 0 auto; text-align: center; }
.rf-timer-ring {
  width: 100px; height: 100px;
  border-radius: 50%;
  border: 6px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 1.5rem;
  font-size: 1.8rem; font-weight: 900;
  position: relative;
}
.rf-timer-ring.low { border-color: var(--error-dark); color: var(--error-dark); animation: pulse 0.6s infinite; }
.rf-score-row { display: flex; gap: 2rem; justify-content: center; margin-bottom: 1.5rem; flex-wrap: wrap; }
.rf-stat { text-align: center; }
.rf-stat-num { font-size: 1.8rem; font-weight: 900; }
.rf-stat-label { font-size: 0.75rem; font-weight: 700; color: var(--text-light); }
.rf-statement {
  font-size: 1.15rem; font-weight: 800; color: var(--text);
  background: linear-gradient(135deg, #fff5f8, #f0eeff);
  padding: 1.5rem; border-radius: var(--radius);
  border-left: 4px solid var(--pink);
  margin-bottom: 1.5rem; line-height: 1.5;
  min-height: 90px; display: flex; align-items: center; justify-content: center;
}
.rf-buttons { display: flex; gap: 1rem; justify-content: center; }
.rf-btn {
  flex: 1; max-width: 180px;
  padding: 1.1rem;
  border: none; border-radius: var(--radius);
  font-family: 'Nunito', sans-serif;
  font-size: 1.4rem; font-weight: 900;
  cursor: pointer;
  transition: all 0.18s;
  box-shadow: var(--shadow);
}
.rf-btn-true  { background: var(--success); color: #fff; }
.rf-btn-false { background: var(--error-dark); color: #fff; }
.rf-btn:hover { transform: scale(1.06); }
.rf-btn.flash-right { animation: btn-right 0.3s; }
.rf-btn.flash-wrong { animation: btn-wrong 0.3s; }
@keyframes btn-right { 0%,100%{} 50%{box-shadow:0 0 0 8px rgba(109,208,139,0.4);} }
@keyframes btn-wrong { 0%,100%{} 50%{box-shadow:0 0 0 8px rgba(224,112,112,0.4);} }

/* ─── MISC HELPERS ───────────────────────────────────────────── */
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.hidden { display: none !important; }

.pill {
  display: inline-flex; align-items: center; gap: 0.3rem;
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-pill);
  font-size: 0.75rem; font-weight: 700;
}
.pill-pink   { background: var(--pink);   color: var(--pink-deep); }
.pill-green  { background: var(--mint);   color: #1a6640; }
.pill-yellow { background: var(--yellow); color: #7a6200; }

/* chapter accent colours applied via JS */
.accent-ch1 { color: var(--ch1-dark); } .bg-ch1 { background: var(--ch1); }
.accent-ch2 { color: var(--ch2-dark); } .bg-ch2 { background: var(--ch2); }
.accent-ch3 { color: var(--ch3-dark); } .bg-ch3 { background: var(--ch3); }
.accent-ch4 { color: var(--ch4-dark); } .bg-ch4 { background: var(--ch4); }
.accent-ch5 { color: var(--ch5-dark); } .bg-ch5 { background: var(--ch5); }
.accent-ch6 { color: var(--ch6-dark); } .bg-ch6 { background: var(--ch6); }
.accent-ch7 { color: var(--ch7-dark); } .bg-ch7 { background: var(--ch7); }
.accent-ch8 { color: var(--ch8-dark); } .bg-ch8 { background: var(--ch8); }
.accent-ch9 { color: var(--ch9-dark); } .bg-ch9 { background: var(--ch9); }

/* ─── RESPONSIVE ─────────────────────────────────────────────── */
@media (max-width: 640px) {
  .top-nav  { flex-direction: column; height: auto; padding: 0.75rem; gap: 0.4rem; }
  .nav-links{ justify-content: center; }
  .view     { padding: 1.25rem 1rem; }
  .bb-board { grid-template-columns: repeat(8, 40px); grid-template-rows: repeat(8, 40px); }
  .bb-cell  { width: 40px; height: 40px; }
  .ws-cell  { width: 27px; height: 27px; font-size: 0.8rem; }
  .matching-board { grid-template-columns: 1fr; }
}

/* ═══════════════════════════════════════════════════════════════
   STUDYFORGE — HOMEPAGE & PRODUCT UI
   All classes use existing design tokens — no new colour decisions
   ═══════════════════════════════════════════════════════════════ */

/* ─── BUTTON SIZE MODIFIERS ──────────────────────────────────── */
.btn-lg { padding: 0.85rem 2rem; font-size: 1.1rem; }
.btn-mint {
  background: var(--mint);
  color: var(--text);
}
.btn-mint:hover { background: #8fd4b8; }

/* ─── NAV STATE BUTTONS ──────────────────────────────────────── */
.nav-cta {
  background: var(--pink) !important;
  color: #fff !important;
  font-weight: 800;
  white-space: nowrap;
}
.nav-cta:hover { background: var(--pink-dark) !important; }
.nav-add-content {
  background: var(--mint);
  color: var(--text);
  font-weight: 800;
  white-space: nowrap;
  border: none;
  border-radius: var(--radius-pill);
  font-family: 'Nunito', sans-serif;
  font-size: 0.82rem;
  padding: 0.35rem 1rem;
  cursor: pointer;
  transition: all 0.2s ease;
}
.nav-add-content:hover { background: #8fd4b8; }

/* ─── LANDING PAGE — HERO ────────────────────────────────────── */
.landing-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
  padding: 4rem 2rem 3rem;
}
.landing-hero h1 {
  font-size: 2.8rem;
  font-weight: 900;
  color: var(--text);
  line-height: 1.15;
  letter-spacing: -1px;
  margin-bottom: 1.1rem;
}
.landing-hero-sub {
  font-size: 1.15rem;
  color: var(--text-light);
  font-weight: 600;
  line-height: 1.6;
  max-width: 540px;
  margin-bottom: 2rem;
}
.landing-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 3rem;
}

/* ─── HERO PRODUCT MOCKUP ────────────────────────────────────── */
.hero-mockup {
  position: relative;
  width: 100%;
  max-width: 560px;
  margin: 0 auto;
}
.hero-mockup-screen {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  border: 1.5px solid var(--border);
  padding: 1.5rem;
  display: flex;
  gap: 1rem;
  justify-content: center;
  align-items: flex-start;
  overflow: hidden;
}
.hero-floating-card {
  background: var(--card-bg);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-hover);
  border: 1.5px solid var(--border);
  padding: 1rem;
  font-size: 0.78rem;
  font-weight: 700;
  min-width: 130px;
  text-align: center;
  flex: 1;
}
.hero-floating-card-label {
  font-size: 0.7rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.5rem;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-pill);
  display: inline-block;
}
.hero-floating-card-body {
  color: var(--text-light);
  font-weight: 600;
  font-size: 0.75rem;
  line-height: 1.4;
}

/* ─── LANDING PAGE — SECTIONS ────────────────────────────────── */
.landing-section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 4rem 2rem;
}
.landing-section-title {
  font-size: 1.75rem;
  font-weight: 900;
  color: var(--text);
  text-align: center;
  margin-bottom: 2.5rem;
  letter-spacing: -0.5px;
}

/* ─── HOW IT WORKS BAND ──────────────────────────────────────── */
.how-it-works {
  background: var(--card-bg);
  border-top: 2px solid var(--border);
  border-bottom: 2px solid var(--border);
}
.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--pink);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 900;
  flex-shrink: 0;
  margin-bottom: 0.75rem;
}
.step-badge {
  display: inline-block;
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-pill);
  font-size: 0.72rem;
  font-weight: 800;
  margin-top: 0.75rem;
  letter-spacing: 0.3px;
}

/* ─── FEATURES GRID ──────────────────────────────────────────── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}
.feature-card-icon {
  font-size: 1.8rem;
  margin-bottom: 0.75rem;
}
.feature-card-title {
  font-size: 1rem;
  font-weight: 900;
  color: var(--text);
  margin-bottom: 0.4rem;
}
.feature-card-body {
  font-size: 0.88rem;
  color: var(--text-light);
  font-weight: 600;
  line-height: 1.5;
}

/* ─── UPLOAD MODAL ───────────────────────────────────────────── */
.upload-modal-inner {
  max-width: 560px;
  width: 100%;
}
.upload-dropzone {
  border: 2.5px dashed var(--lavender);
  border-radius: var(--radius);
  padding: 2.5rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-bottom: 1.25rem;
  background: transparent;
}
.upload-dropzone:hover,
.upload-dropzone.dragover {
  border-color: var(--pink);
  background: #fff5f8;
}
.upload-dropzone-icon { font-size: 2.5rem; margin-bottom: 0.75rem; }
.upload-dropzone-text { font-weight: 700; color: var(--text); margin-bottom: 0.4rem; }
.upload-dropzone-sub  { font-size: 0.82rem; color: var(--text-light); font-weight: 600; }
.upload-or {
  text-align: center;
  color: var(--text-muted);
  font-weight: 700;
  font-size: 0.85rem;
  margin: 0.75rem 0;
}
.upload-paste-area {
  width: 100%;
  min-height: 120px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  font-family: 'Nunito', sans-serif;
  font-size: 0.9rem;
  color: var(--text);
  resize: vertical;
  outline: none;
  transition: border-color 0.2s;
}
.upload-paste-area:focus { border-color: var(--lavender); }
.upload-deck-name {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin: 1rem 0;
}
.upload-deck-name label {
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--text);
}
.upload-deck-name input {
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.6rem 1rem;
  font-family: 'Nunito', sans-serif;
  font-size: 0.9rem;
  color: var(--text);
  outline: none;
  transition: border-color 0.2s;
}
.upload-deck-name input:focus { border-color: var(--lavender); }
.upload-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: flex-end;
  margin-top: 1.25rem;
}

/* ─── PROCESSING STAGE ───────────────────────────────────────── */
.processing-wrap {
  text-align: center;
  padding: 1rem 0 0.5rem;
}
.processing-step {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0;
  opacity: 0;
  transform: translateY(8px);
  animation: fadeUpStep 0.4s ease forwards;
  font-weight: 700;
  color: var(--text);
}
.processing-step:nth-child(1) { animation-delay: 0.1s; }
.processing-step:nth-child(2) { animation-delay: 1.6s; }
.processing-step:nth-child(3) { animation-delay: 3.1s; }
@keyframes fadeUpStep {
  to { opacity: 1; transform: translateY(0); }
}
.processing-bar-wrap {
  margin: 1.5rem auto 0.75rem;
  max-width: 320px;
  height: 8px;
  background: var(--border);
  border-radius: var(--radius-pill);
  overflow: hidden;
}
.processing-bar-fill {
  height: 100%;
  width: 30%;
  background: linear-gradient(90deg, var(--pink), var(--lavender));
  border-radius: var(--radius-pill);
  animation: indeterminateSlide 1.6s ease-in-out infinite;
}
@keyframes indeterminateSlide {
  0%   { transform: translateX(-200%); }
  100% { transform: translateX(500%); }
}
.processing-note {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 600;
}

/* ─── SUCCESS STAGE ──────────────────────────────────────────── */
.upload-success {
  text-align: center;
  padding: 1rem 0;
}
.upload-success-icon { font-size: 3rem; margin-bottom: 0.75rem; }
.upload-success h2 {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--text);
  margin-bottom: 0.5rem;
}
.upload-success-stats {
  color: var(--text-light);
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}
.upload-success-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ─── RETURNING USER DASHBOARD ───────────────────────────────── */
.dash-hero-compact {
  background: linear-gradient(135deg, var(--pink), var(--lavender));
  border-radius: var(--radius);
  padding: 1.75rem 2rem;
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow);
}
.dash-hero-compact-left h2 {
  font-size: 1.4rem;
  font-weight: 900;
  margin-bottom: 0.25rem;
}
.dash-hero-compact-left p {
  font-size: 0.9rem;
  font-weight: 600;
  opacity: 0.85;
}
.dash-hero-compact-right {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ─── DECK CARDS ─────────────────────────────────────────────── */
.deck-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1.5px solid var(--border);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  transition: box-shadow 0.2s, transform 0.2s;
  cursor: pointer;
}
.deck-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.deck-card-subject {
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
}
.deck-card h3 {
  font-size: 1rem;
  font-weight: 900;
  color: var(--text);
}
.deck-card-add {
  background: transparent;
  border-radius: var(--radius);
  border: 2px dashed var(--lavender);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  cursor: pointer;
  min-height: 140px;
  transition: all 0.2s ease;
  color: var(--text-light);
  font-weight: 700;
  font-size: 0.9rem;
  text-align: center;
}
.deck-card-add:hover {
  border-color: var(--pink);
  background: #fff5f8;
  color: var(--text);
}
.deck-card-add-icon { font-size: 1.6rem; }

/* Active deck highlight */
.deck-card-active {
  border-color: var(--lavender);
  box-shadow: 0 0 0 3px rgba(201,184,232,0.35), var(--shadow-hover);
}

/* ─── DECK PROGRESS BAR ──────────────────────────────────────── */
.progress-bar-wrap {
  width: 100%;
  height: 7px;
  background: var(--border);
  border-radius: var(--radius-pill);
  overflow: hidden;
}
.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--pink), var(--lavender));
  border-radius: var(--radius-pill);
  transition: width 0.4s ease;
  min-width: 2px;
}

/* ─── LANDING PAGE BACKGROUND ────────────────────────────────── */
.landing-bg {
  background:
    radial-gradient(ellipse at 65% 35%, #ffd5b820, transparent 60%),
    radial-gradient(ellipse at 20% 80%, #c9b8e820, transparent 60%),
    var(--bg);
}

/* ─── AUTH ────────────────────────────────────────────────────── */
.nav-auth-btn {
  margin-left: auto;
  flex-shrink: 0;
}

.nav-avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.8rem;
  height: 1.8rem;
  border-radius: 50%;
  background: var(--pink);
  color: #fff;
  font-weight: 800;
  font-size: 0.85rem;
  pointer-events: none;
}

.auth-avatar-lg {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--pink), var(--lavender));
  color: #fff;
  font-weight: 900;
  font-size: 1.5rem;
  margin: 0 auto 0.25rem;
}

.auth-modal-box {
  max-width: 420px;
  width: 100%;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.auth-modal-title {
  font-size: 1.4rem;
  font-weight: 900;
  margin: 0;
}

.auth-modal-sub {
  color: var(--text-light);
  margin: 0;
  font-size: 0.95rem;
}

.auth-google-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
}

.auth-divider {
  color: var(--text-light);
  font-size: 0.85rem;
  margin: 0.1rem 0;
}

.auth-email-input {
  width: 100%;
  padding: 0.65rem 0.9rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: 1rem;
  background: var(--bg);
  color: var(--text);
  box-sizing: border-box;
  transition: border-color 0.15s;
}

.auth-email-input:focus {
  outline: none;
  border-color: var(--pink);
}

.auth-status {
  font-size: 0.88rem;
  color: var(--text-light);
  min-height: 1.1rem;
}

.auth-cancel-btn {
  font-size: 0.85rem;
  color: var(--text-light);
  padding: 0.3rem 0.6rem;
}