:root {
  --bg: #0b0d17;
  --bg-2: #131628;
  --surface: rgba(255, 255, 255, 0.06);
  --surface-strong: rgba(255, 255, 255, 0.1);
  --border: rgba(255, 255, 255, 0.12);
  --text: #f1f3f9;
  --text-dim: #a4a9bd;
  --accent: #7c5cff;
  --accent-2: #00d4ff;
  --accent-3: #ff6b9d;
  --success: #2ee6a8;
  --danger: #ff5470;
  --warn: #ffc857;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  --radius: 18px;
}

* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: radial-gradient(ellipse at top, #1a1d35 0%, var(--bg) 60%);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  line-height: 1.5;
  padding-top: env(safe-area-inset-top);
  padding-bottom: env(safe-area-inset-bottom);
}

button { font-family: inherit; touch-action: manipulation; }
input, select, textarea { font-family: inherit; font-size: 16px; }

.bg-blobs { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
.blob { position: absolute; border-radius: 50%; filter: blur(120px); opacity: 0.35; animation: float 18s ease-in-out infinite; }
.blob-1 { width: 500px; height: 500px; background: var(--accent); top: -200px; left: -150px; }
.blob-2 { width: 450px; height: 450px; background: var(--accent-2); top: 30%; right: -180px; animation-delay: -6s; }
.blob-3 { width: 400px; height: 400px; background: var(--accent-3); bottom: -150px; left: 30%; animation-delay: -12s; }

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(40px, -30px) scale(1.08); }
  66% { transform: translate(-30px, 40px) scale(0.95); }
}

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 24px 48px; gap: 24px; flex-wrap: wrap;
}

.brand { display: flex; align-items: center; gap: 16px; }
.logo {
  width: 52px; height: 52px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-3) 100%);
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 800; font-size: 24px;
  color: white;
  box-shadow: 0 8px 24px rgba(124, 92, 255, 0.4);
}
.logo span { color: var(--accent-2); }
.brand h1 { font-family: 'Space Grotesk', sans-serif; font-size: 24px; font-weight: 700; letter-spacing: -0.02em; }
.tagline { font-size: 13px; color: var(--text-dim); margin-top: 2px; }

.stats-bar { display: flex; gap: 12px; }
.stat {
  background: var(--surface); border: 1px solid var(--border);
  padding: 10px 18px; border-radius: 12px;
  display: flex; flex-direction: column; align-items: center;
  min-width: 80px;
  backdrop-filter: blur(20px);
}
.stat-label { font-size: 11px; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.08em; }
.stat-value { font-family: 'Space Grotesk', sans-serif; font-size: 20px; font-weight: 700; color: var(--text); }

main { padding: 16px 48px 60px; max-width: 1200px; margin: 0 auto; }

.screen { display: none; animation: fadeIn 0.4s ease; }
.screen.active { display: block; }

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

.screen-title { font-family: 'Space Grotesk', sans-serif; font-size: 36px; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 8px; }
.screen-sub { color: var(--text-dim); font-size: 16px; margin-bottom: 32px; max-width: 640px; }

.mode-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 18px; margin-bottom: 36px;
}

.mode-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px; text-align: left;
  cursor: pointer; color: var(--text);
  font-family: inherit;
  position: relative; overflow: hidden;
  backdrop-filter: blur(20px);
  transition: all 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.mode-card::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(124, 92, 255, 0.15), rgba(0, 212, 255, 0.08));
  opacity: 0; transition: opacity 0.3s;
}
.mode-card:hover { transform: translateY(-4px); border-color: rgba(124, 92, 255, 0.5); box-shadow: var(--shadow); }
.mode-card:hover::before { opacity: 1; }
.mode-card > * { position: relative; }
.mode-icon { font-size: 36px; margin-bottom: 12px; display: block; }
.mode-card h3 { font-family: 'Space Grotesk', sans-serif; font-size: 20px; margin-bottom: 6px; }
.mode-card p { color: var(--text-dim); font-size: 14px; line-height: 1.55; }
.mode-tag {
  position: absolute; top: 20px; right: 20px;
  background: rgba(124, 92, 255, 0.18); color: #c5b8ff;
  padding: 4px 10px; border-radius: 999px;
  font-size: 11px; font-weight: 600; letter-spacing: 0.04em;
}

.categories { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; padding: 20px 0; border-top: 1px solid var(--border); }
.cat-label { color: var(--text-dim); font-size: 13px; margin-right: 8px; }
.chip {
  background: var(--surface); border: 1px solid var(--border);
  color: var(--text); font-family: inherit; font-size: 13px; font-weight: 500;
  padding: 8px 14px; border-radius: 999px; cursor: pointer;
  transition: all 0.2s;
}
.chip:hover { background: var(--surface-strong); border-color: rgba(124, 92, 255, 0.4); }
.chip.active { background: linear-gradient(135deg, var(--accent), var(--accent-3)); border-color: transparent; color: white; }

.back-btn {
  background: var(--surface); border: 1px solid var(--border); color: var(--text);
  padding: 10px 16px; border-radius: 10px; cursor: pointer;
  font-family: inherit; font-size: 14px; font-weight: 500;
  margin-bottom: 20px; transition: all 0.2s;
}
.back-btn:hover { background: var(--surface-strong); }

.progress-wrap { height: 6px; background: var(--surface); border-radius: 999px; overflow: hidden; margin-bottom: 28px; }
.progress-bar {
  height: 100%; width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border-radius: 999px;
  transition: width 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* FLASHCARDS */
.flashcard-stage { margin-bottom: 28px; }
.flashcard {
  position: relative; width: 100%; height: 380px;
  cursor: pointer;
}
.flash-face {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(124, 92, 255, 0.18), rgba(0, 212, 255, 0.08));
  border: 1px solid var(--border); border-radius: 24px;
  padding: 40px;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center;
  box-shadow: var(--shadow);
  opacity: 0; transform: scale(0.96);
  transition: opacity 0.35s ease, transform 0.35s ease;
  pointer-events: none;
}
.flash-front { opacity: 1; transform: scale(1); pointer-events: auto; }
.flash-back { background: linear-gradient(135deg, rgba(46, 230, 168, 0.12), rgba(124, 92, 255, 0.10)); }
.flashcard.flipped .flash-front { opacity: 0; transform: scale(0.96); pointer-events: none; }
.flashcard.flipped .flash-back { opacity: 1; transform: scale(1); pointer-events: auto; }
.flash-cat {
  background: var(--surface-strong); color: var(--accent-2);
  padding: 6px 14px; border-radius: 999px;
  font-size: 12px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase;
  margin-bottom: 24px;
}
.flash-front h2 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 48px; font-weight: 700; letter-spacing: -0.02em;
  background: linear-gradient(135deg, #fff, #c5b8ff);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 16px;
}
.flash-hint { color: var(--text-dim); font-size: 14px; }
.flash-back p { font-size: 18px; line-height: 1.6; max-width: 700px; margin-bottom: 20px; }
.flash-example {
  font-size: 14px; color: var(--text-dim); font-style: italic;
  border-left: 3px solid var(--accent); padding-left: 16px;
  max-width: 600px; text-align: left;
}

.flash-controls { display: flex; gap: 12px; justify-content: center; }
.primary-btn, .ghost-btn {
  font-family: inherit; font-size: 15px; font-weight: 600;
  padding: 14px 28px; border-radius: 12px; cursor: pointer;
  transition: all 0.2s; border: none;
}
.primary-btn {
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  color: white;
  box-shadow: 0 8px 24px rgba(124, 92, 255, 0.35);
}
.primary-btn:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(124, 92, 255, 0.45); }
.ghost-btn {
  background: var(--surface); color: var(--text); border: 1px solid var(--border);
}
.ghost-btn:hover { background: var(--surface-strong); }

/* QUIZ CARDS */
.quiz-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 24px; padding: 36px;
  backdrop-filter: blur(20px); box-shadow: var(--shadow);
  margin-bottom: 24px;
}
.quiz-label {
  display: inline-block; background: rgba(0, 212, 255, 0.12); color: var(--accent-2);
  padding: 6px 14px; border-radius: 999px;
  font-size: 12px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase;
  margin-bottom: 20px;
}
.quiz-question { font-size: 22px; line-height: 1.5; font-weight: 500; margin-bottom: 28px; }
.quiz-question .blank { display: inline-block; min-width: 80px; border-bottom: 2px dashed var(--accent); margin: 0 4px; }
.quiz-question .blank.filled { color: var(--success); border-bottom-color: var(--success); font-weight: 700; }

.answers-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.abbr-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
.case-grid { grid-template-columns: 1fr; }

.answer-btn {
  background: var(--surface-strong); border: 1px solid var(--border);
  color: var(--text); font-family: inherit; font-size: 15px; font-weight: 500;
  padding: 18px 20px; border-radius: 14px; cursor: pointer;
  text-align: left; transition: all 0.2s;
  line-height: 1.5;
}
.answer-btn:hover:not(:disabled) { background: rgba(124, 92, 255, 0.15); border-color: rgba(124, 92, 255, 0.4); transform: translateY(-1px); }
.answer-btn.correct { background: rgba(46, 230, 168, 0.18); border-color: var(--success); color: #c8ffe9; }
.answer-btn.wrong { background: rgba(255, 84, 112, 0.15); border-color: var(--danger); color: #ffd0d8; }
.answer-btn:disabled { cursor: default; opacity: 0.7; }
.answer-btn.correct:disabled, .answer-btn.wrong:disabled { opacity: 1; }

.feedback {
  margin-top: 22px; padding: 16px 20px; border-radius: 14px;
  font-size: 15px; line-height: 1.55;
  display: none;
}
.feedback.show { display: block; animation: fadeIn 0.3s; }
.feedback.correct { background: rgba(46, 230, 168, 0.1); border-left: 3px solid var(--success); }
.feedback.wrong { background: rgba(255, 84, 112, 0.1); border-left: 3px solid var(--danger); }
.feedback strong { color: var(--accent-2); }

.case-card .case-scenario {
  background: rgba(0, 0, 0, 0.25);
  border-left: 4px solid var(--accent-3);
  padding: 20px 24px; border-radius: 12px;
  font-size: 16px; line-height: 1.65;
  margin-bottom: 24px; font-style: italic;
  color: #e0e3f0;
}

/* QUIZ MIXED */
.quiz-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; font-size: 14px; color: var(--text-dim); font-weight: 600; }
#quizScore { font-family: 'Space Grotesk', sans-serif; color: var(--accent-2); font-size: 18px; }

.quiz-result {
  text-align: center; padding: 40px 20px;
}
.quiz-result h2 { font-family: 'Space Grotesk', sans-serif; font-size: 42px; margin-bottom: 8px; }
.quiz-result .score-big {
  font-family: 'Space Grotesk', sans-serif; font-size: 72px; font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  margin: 16px 0;
}
.quiz-result p { color: var(--text-dim); margin-bottom: 24px; }

/* BROWSE */
.browse-toolbar { display: flex; gap: 12px; margin-bottom: 24px; flex-wrap: wrap; }
.browse-toolbar input, .browse-toolbar select {
  background: var(--surface); border: 1px solid var(--border); color: var(--text);
  padding: 12px 16px; border-radius: 12px; font-family: inherit; font-size: 14px;
  flex: 1; min-width: 200px;
}
.browse-toolbar input:focus, .browse-toolbar select:focus { outline: none; border-color: var(--accent); }

.dictionary { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 14px; }
.dict-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 16px; padding: 20px;
  transition: all 0.2s;
}
.dict-card:hover { border-color: rgba(124, 92, 255, 0.4); transform: translateY(-2px); }
.dict-card .dict-term {
  font-family: 'Space Grotesk', sans-serif; font-size: 20px; font-weight: 700;
  margin-bottom: 8px;
}
.dict-card .dict-cat {
  display: inline-block;
  background: var(--surface-strong); color: var(--accent-2);
  padding: 3px 10px; border-radius: 999px;
  font-size: 11px; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase;
  margin-bottom: 10px;
}
.dict-card .dict-def { color: var(--text-dim); font-size: 14px; line-height: 1.55; }

/* COURSE */
.mode-card-hero {
  grid-column: span 2;
  background: linear-gradient(135deg, rgba(124, 92, 255, 0.25), rgba(255, 107, 157, 0.15));
  border-color: rgba(124, 92, 255, 0.4);
}
.mode-tag-hero { background: linear-gradient(135deg, var(--accent), var(--accent-3)); color: white; }

.course-header { margin-bottom: 36px; }
.course-progress-summary { display: flex; align-items: center; gap: 16px; margin-top: 20px; max-width: 480px; }
.course-progress-bar { flex: 1; height: 10px; background: var(--surface); border-radius: 999px; overflow: hidden; }
.course-progress-fill {
  height: 100%; width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2), var(--success));
  border-radius: 999px;
  transition: width 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}
#courseProgressLabel { font-size: 14px; color: var(--text-dim); font-weight: 600; }

.course-path { display: flex; flex-direction: column; gap: 14px; position: relative; }
.lesson-node {
  display: flex; align-items: stretch; gap: 18px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 18px; padding: 20px 24px;
  cursor: pointer; transition: all 0.25s;
  position: relative;
  font-family: inherit; color: var(--text); text-align: left;
  width: 100%;
}
.lesson-node:not(:last-child)::after {
  content: ''; position: absolute;
  left: 50px; bottom: -14px; width: 2px; height: 14px;
  background: linear-gradient(to bottom, var(--border), transparent);
}
.lesson-node.available { border-color: rgba(124, 92, 255, 0.4); }
.lesson-node.available:hover { transform: translateX(4px); border-color: var(--accent); box-shadow: 0 12px 32px rgba(124, 92, 255, 0.2); }
.lesson-node.completed { background: rgba(46, 230, 168, 0.08); border-color: rgba(46, 230, 168, 0.35); }
.lesson-node.completed:hover { transform: translateX(4px); }
.lesson-node.locked { opacity: 0.45; cursor: not-allowed; }

.lesson-circle {
  width: 56px; height: 56px; min-width: 56px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px;
  background: var(--surface-strong);
  border: 2px solid var(--border);
  position: relative;
}
.lesson-node.available .lesson-circle {
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  border-color: transparent;
  box-shadow: 0 8px 24px rgba(124, 92, 255, 0.35);
}
.lesson-node.completed .lesson-circle {
  background: linear-gradient(135deg, var(--success), var(--accent-2));
  border-color: transparent;
}
.lesson-node.completed .lesson-circle::after {
  content: '✓'; position: absolute;
  right: -4px; bottom: -4px;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--success); color: var(--bg);
  font-size: 13px; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  border: 2px solid var(--bg);
}
.lesson-node.locked .lesson-circle::after {
  content: '🔒'; position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0,0,0,0.4); border-radius: 50%; font-size: 18px;
}

.lesson-body { flex: 1; display: flex; flex-direction: column; justify-content: center; gap: 4px; }
.lesson-num { font-size: 11px; color: var(--text-dim); font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; }
.lesson-title { font-family: 'Space Grotesk', sans-serif; font-size: 18px; font-weight: 700; }
.lesson-desc { font-size: 13px; color: var(--text-dim); line-height: 1.5; }
.lesson-meta { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 6px; }
.lesson-meta span {
  font-size: 11px; padding: 3px 8px; border-radius: 999px;
  background: var(--surface-strong); color: var(--text-dim); font-weight: 600;
}
.lesson-score {
  align-self: center; min-width: 70px; text-align: right;
  font-family: 'Space Grotesk', sans-serif; font-size: 14px; font-weight: 700;
  color: var(--success);
}

/* LESSON RUNNER */
.lesson-intro { text-align: center; padding: 40px 24px; }
.lesson-intro .lesson-icon-big { font-size: 64px; margin-bottom: 16px; }
.lesson-intro h2 { font-family: 'Space Grotesk', sans-serif; font-size: 32px; margin-bottom: 12px; }
.lesson-intro p.lesson-desc-big { color: var(--text-dim); font-size: 16px; max-width: 600px; margin: 0 auto 24px; line-height: 1.6; }
.lesson-terms-list { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-bottom: 32px; max-width: 700px; margin-left: auto; margin-right: auto; }
.lesson-terms-list span {
  background: var(--surface); border: 1px solid var(--border);
  padding: 8px 14px; border-radius: 999px;
  font-family: 'Space Grotesk', sans-serif; font-weight: 600; font-size: 14px;
}

.lesson-phase-label {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 16px; font-size: 13px; color: var(--text-dim); font-weight: 600;
}
.lesson-phase-label .phase-tag {
  background: rgba(124, 92, 255, 0.15); color: #c5b8ff;
  padding: 4px 12px; border-radius: 999px;
  font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase;
}

.lesson-result { text-align: center; padding: 40px 20px; }
.lesson-result h2 { font-family: 'Space Grotesk', sans-serif; font-size: 36px; margin-bottom: 8px; }
.lesson-result .score-big {
  font-family: 'Space Grotesk', sans-serif; font-size: 72px; font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  margin: 16px 0;
}
.lesson-result.pass .score-big { background: linear-gradient(135deg, var(--success), var(--accent-2)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.lesson-result.fail .score-big { background: linear-gradient(135deg, var(--danger), var(--warn)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.lesson-result p { color: var(--text-dim); margin-bottom: 24px; max-width: 480px; margin-left:auto; margin-right:auto; }

.lesson-flashcard {
  background: linear-gradient(135deg, rgba(124, 92, 255, 0.15), rgba(0, 212, 255, 0.06));
  border: 1px solid var(--border); border-radius: 24px;
  padding: 40px; min-height: 320px;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}
.lesson-flashcard .lf-term {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 44px; font-weight: 700; letter-spacing: -0.02em;
  background: linear-gradient(135deg, #fff, #c5b8ff);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  margin-bottom: 8px;
}
.lesson-flashcard .lf-full { color: var(--accent-2); font-weight: 600; margin-bottom: 20px; }
.lesson-flashcard .lf-def { font-size: 17px; line-height: 1.6; max-width: 700px; margin-bottom: 18px; }
.lesson-flashcard .lf-example {
  font-size: 14px; color: var(--text-dim); font-style: italic;
  border-left: 3px solid var(--accent); padding-left: 16px;
  max-width: 600px; text-align: left;
}

@media (max-width: 640px) {
  .mode-card-hero { grid-column: span 1; }
  .lesson-node { padding: 16px; gap: 12px; }
  .lesson-circle { width: 44px; height: 44px; min-width: 44px; font-size: 20px; }
  .lesson-flashcard .lf-term { font-size: 32px; }
}

/* TOAST */
.toast {
  position: fixed; bottom: 32px; left: 50%; transform: translateX(-50%) translateY(80px);
  background: var(--surface-strong); border: 1px solid var(--border);
  padding: 14px 22px; border-radius: 12px;
  font-size: 14px; font-weight: 500;
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow);
  opacity: 0; transition: all 0.3s;
  pointer-events: none; z-index: 100;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.success { border-color: var(--success); color: #c8ffe9; }
.toast.error { border-color: var(--danger); color: #ffd0d8; }

/* ===== MOBILE / TABLET ===== */
@media (max-width: 900px) {
  main { padding: 12px 20px 60px; }
  .topbar { padding: 16px 20px; }
  .mode-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
  .mode-card-hero { grid-column: span 2; }
  .dictionary { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  body { font-size: 15px; }
  main { padding: 8px 16px max(40px, env(safe-area-inset-bottom)); }

  .topbar {
    padding: 14px 16px;
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }
  .brand { gap: 12px; }
  .brand h1 { font-size: 20px; }
  .tagline { font-size: 12px; }
  .logo { width: 44px; height: 44px; font-size: 20px; border-radius: 12px; }

  .stats-bar { width: 100%; gap: 8px; }
  .stat { flex: 1; min-width: 0; padding: 8px 10px; }
  .stat-label { font-size: 10px; }
  .stat-value { font-size: 18px; }

  .screen-title { font-size: 24px; }
  .screen-sub { font-size: 14px; margin-bottom: 22px; }

  .mode-grid { grid-template-columns: 1fr; gap: 12px; margin-bottom: 24px; }
  .mode-card-hero { grid-column: span 1; }
  .mode-card { padding: 20px; }
  .mode-card h3 { font-size: 18px; }
  .mode-card p { font-size: 13px; }
  .mode-icon { font-size: 30px; }
  .mode-tag { top: 16px; right: 16px; font-size: 10px; padding: 3px 8px; }

  .categories { padding: 16px 0; gap: 6px; }
  .chip { padding: 10px 14px; font-size: 13px; min-height: 38px; }
  .cat-label { width: 100%; margin-bottom: 4px; }

  .back-btn { padding: 12px 16px; min-height: 44px; font-size: 14px; }

  /* QUIZ */
  .quiz-card { padding: 22px 18px; border-radius: 18px; }
  .quiz-question { font-size: 17px; margin-bottom: 22px; }
  .quiz-label { font-size: 11px; }
  .answers-grid { grid-template-columns: 1fr; gap: 10px; }
  .abbr-grid { grid-template-columns: 1fr 1fr; }
  .answer-btn { padding: 16px 16px; font-size: 14.5px; min-height: 52px; }

  /* FLASHCARDS */
  .flashcard { height: 340px; }
  .flash-face { padding: 28px 20px; border-radius: 20px; }
  .flash-front h2 { font-size: 36px; }
  .flash-back p { font-size: 16px; }
  .flash-example { font-size: 13px; }

  .flash-controls { flex-direction: column; gap: 10px; }
  .flash-controls button { width: 100%; min-height: 50px; padding: 14px 20px; }
  .primary-btn, .ghost-btn { font-size: 15px; }

  .feedback { padding: 14px 16px; font-size: 14px; }

  /* CASE */
  .case-card .case-scenario { padding: 16px 18px; font-size: 14px; }

  /* COURSE */
  .course-progress-summary { flex-direction: column; align-items: stretch; gap: 8px; }
  .course-progress-bar { width: 100%; }
  #courseProgressLabel { text-align: center; }

  .lesson-node { padding: 14px; gap: 12px; }
  .lesson-node:not(:last-child)::after { left: 36px; }
  .lesson-circle { width: 44px; height: 44px; min-width: 44px; font-size: 22px; }
  .lesson-title { font-size: 15px; }
  .lesson-desc { font-size: 12.5px; }
  .lesson-num { font-size: 10px; }
  .lesson-meta span { font-size: 10px; padding: 2px 7px; }
  .lesson-score { font-size: 13px; min-width: 50px; }

  /* LESSON RUNNER */
  .lesson-intro { padding: 24px 12px; }
  .lesson-intro .lesson-icon-big { font-size: 52px; }
  .lesson-intro h2 { font-size: 24px; }
  .lesson-intro p.lesson-desc-big { font-size: 14px; }
  .lesson-terms-list span { padding: 6px 12px; font-size: 13px; }

  .lesson-flashcard { padding: 28px 20px; min-height: 280px; border-radius: 20px; }
  .lesson-flashcard .lf-term { font-size: 32px; }
  .lesson-flashcard .lf-full { font-size: 14px; }
  .lesson-flashcard .lf-def { font-size: 15px; }

  .lesson-phase-label { flex-direction: column; align-items: flex-start; gap: 6px; font-size: 12px; }

  .lesson-result h2 { font-size: 26px; }
  .lesson-result .score-big { font-size: 56px; }
  .lesson-result .flash-controls { flex-direction: column; }
  .lesson-result .flash-controls button { width: 100%; }

  /* QUIZ MIXED */
  .quiz-header { font-size: 13px; }
  #quizScore { font-size: 16px; }
  .quiz-result h2 { font-size: 30px; }
  .quiz-result .score-big { font-size: 56px; }

  /* BROWSE */
  .browse-toolbar { flex-direction: column; gap: 10px; }
  .browse-toolbar input, .browse-toolbar select { width: 100%; min-height: 46px; }
  .dict-card { padding: 18px; }
  .dict-card .dict-term { font-size: 18px; }
  .dict-card .dict-def { font-size: 13px; }

  /* TOAST */
  .toast { bottom: max(20px, env(safe-area-inset-bottom)); left: 16px; right: 16px; transform: translateY(80px); text-align: center; font-size: 13px; }
  .toast.show { transform: translateY(0); }

  /* hover-only effects off on touch */
  .mode-card:hover { transform: none; }
  .answer-btn:hover:not(:disabled) { transform: none; }
  .lesson-node.available:hover { transform: none; }
  .lesson-node.completed:hover { transform: none; }
  .primary-btn:hover { transform: none; }
}

@media (max-width: 380px) {
  .abbr-grid { grid-template-columns: 1fr; }
  .stat { padding: 6px 8px; }
  .stat-label { font-size: 9px; }
  .stat-value { font-size: 16px; }
}