:root {
  --bg: #0b0c10; --surface: #161924; --surface-hover: #1f2330;
  --accent: #7c67f6; --accent-glow: rgba(124,103,246,0.25);
  --text: #e6e8f0; --text-dim: #8a8fa5;
  --success: #34d399; --error: #f472b6;
  --gold: #fbbf24; --gold-glow: rgba(251,191,36,0.25);
  --root-bg: rgba(124,103,246,0.1); --root-border: rgba(124,103,246,0.35);
  --radius: 14px; --shadow: 0 8px 24px rgba(0,0,0,0.45);
  --anim: 220ms cubic-bezier(0.2,0.8,0.2,1);
}
* { box-sizing:border-box; margin:0; padding:0; }
body { font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif; background:var(--bg); color:var(--text); min-height:100vh; display:flex; flex-direction:column; align-items:center; padding:20px; overflow-x:hidden; }
html { color-scheme: dark; }

.app-header { display:flex; align-items:center; gap:16px; width:100%; max-width:640px; margin-bottom:24px; flex-wrap:wrap; }
h1 { font-size:1.5rem; font-weight:700; letter-spacing:-0.5px; }
h1 span { color:var(--accent); }
.level-badge, .score-badge { background:var(--surface); padding:6px 14px; border-radius:20px; font-size:0.8rem; font-weight:600; }
.level-badge { color:var(--text-dim); }
.score-badge { color:var(--gold); border:1px solid rgba(251,191,36,0.3); box-shadow:0 0 12px var(--gold-glow); }

h2 { margin-bottom:16px; font-size:1.1rem; color:var(--text-dim); font-weight:500; }
.view { display:none; width:100%; max-width:640px; animation:fadeUp 350ms ease; }
.view.active { display:block; }
@keyframes fadeUp { from{opacity:0;transform:translateY(10px)} to{opacity:1;transform:translateY(0)} }

.card-grid { display:grid; gap:16px; margin-bottom:24px; }
.card-grid.single { grid-template-columns:1fr; }

.intro-copy { background:var(--surface); border-radius:var(--radius); padding:24px; box-shadow:var(--shadow); line-height:1.7; color:var(--text-dim); }
.intro-copy p { margin-bottom:12px; }
.intro-copy p:last-child { margin-bottom:0; }
.intro-copy b { color:var(--text); }
.intro-copy i { color:var(--accent); font-style:italic; }

.study-hint { margin-bottom:12px; color:var(--text-dim); text-align:center; font-size:0.95rem; font-weight:500; }

.word-tabs { display:flex; gap:8px; margin-bottom:14px; }
.word-tab {
  flex:1; background:var(--surface); color:var(--text-dim); border:1px solid rgba(255,255,255,0.06);
  border-radius:10px; padding:12px 8px; font-size:1.25rem; font-weight:700; cursor:pointer;
  transition:all var(--anim); box-shadow:none;
}
.word-tab:hover { background:var(--surface-hover); color:var(--text); }
.word-tab.active { background:var(--accent); color:#fff; border-color:var(--accent); box-shadow:0 4px 14px var(--accent-glow); }

.word-card { background:var(--surface); border-radius:var(--radius); padding:22px; box-shadow:var(--shadow); transition:transform var(--anim), background var(--anim); animation:fadeUp 300ms ease; }
.word-card:hover { background:var(--surface-hover); }
.study-row { display:flex; align-items:center; justify-content:space-between; gap:16px; }
.hb-text { font-size:2.4rem; font-weight:700; line-height:1.2; flex:1; }
.speak-btn { width:44px; height:44px; border-radius:50%; background:var(--surface-hover); border:1px solid rgba(255,255,255,0.08); cursor:pointer; display:flex; align-items:center; justify-content:center; flex-shrink:0; transition:all var(--anim); box-shadow:none; }
.speak-icon { font-size:1.2rem; line-height:1; }
.speak-btn:hover { border-color:var(--accent); transform:scale(1.08); box-shadow:none; }
.speak-btn:active { transform:scale(0.92); }
.pron-text { font-size:0.95rem; color:var(--accent); font-weight:500; margin:8px 0 16px; font-style:italic; }
.m-text { color:var(--text-dim); font-style:normal; font-weight:600; }

.root-block { background:var(--root-bg); border:1px solid var(--root-border); border-radius:12px; padding:14px 16px; margin-bottom:16px; }
.root-header { display:flex; align-items:baseline; gap:10px; margin-bottom:8px; flex-wrap:wrap; }
.root-label { font-size:0.7rem; font-weight:700; text-transform:uppercase; letter-spacing:0.6px; color:var(--accent); padding:3px 8px; border-radius:6px; background:rgba(124,103,246,0.18); }
.root-letters { font-size:1.5rem; font-weight:800; color:var(--text); letter-spacing:4px; }
.root-tr { font-size:0.9rem; color:var(--text-dim); font-weight:600; font-family:monospace; }
.root-note { font-size:0.86rem; line-height:1.6; color:var(--text-dim); margin:0; }

.senses { display:flex; flex-direction:column; gap:10px; margin-bottom:18px; }
.sense { border-left:3px solid var(--accent); padding:6px 0 6px 14px; background:rgba(124,103,246,0.06); border-radius:0 8px 8px 0; }
.sense-label { font-size:0.85rem; font-weight:700; color:var(--text); margin-bottom:2px; }
.sense-verse { font-size:0.88rem; color:var(--text-dim); line-height:1.5; }

.note-block { display:flex; gap:10px; align-items:flex-start; padding:11px 12px; border-radius:10px; font-size:0.86rem; line-height:1.55; color:var(--text-dim); margin-top:8px; }
.note-block.hist { background:rgba(251,191,36,0.07); }
.note-block.mod { background:rgba(52,211,153,0.07); }
.note-tag { flex-shrink:0; font-size:0.7rem; font-weight:700; text-transform:uppercase; letter-spacing:0.5px; padding:3px 8px; border-radius:6px; }
.note-block.hist .note-tag { background:rgba(251,191,36,0.18); color:var(--gold); }
.note-block.mod .note-tag { background:rgba(52,211,153,0.18); color:var(--success); }

button { background:var(--accent); color:#fff; border:none; padding:14px 20px; border-radius:12px; font-size:1rem; font-weight:600; cursor:pointer; width:100%; transition:all var(--anim); box-shadow:0 4px 14px var(--accent-glow); }
button:hover { background:#6652e6; transform:translateY(-1px); }
button:active { transform:translateY(1px); }
button:focus-visible { outline:3px solid var(--success); outline-offset:2px; }

.quiz-progress { display:flex; justify-content:space-between; align-items:center; margin-bottom:20px; gap:12px; }
.progress-bar { flex:1; height:6px; background:var(--surface); border-radius:3px; overflow:hidden; }
#progress-fill { height:100%; width:0%; background:var(--accent); transition:width 350ms ease; }
#streak-display { font-weight:700; color:var(--accent); }
.stats-badge { font-size:0.85rem; color:var(--text-dim); font-weight:600; white-space:nowrap; }

.quiz-card { background:var(--surface); border-radius:var(--radius); padding:32px 20px; text-align:center; box-shadow:var(--shadow); transition:all var(--anim); }
.quiz-word { font-size:2.6rem; font-weight:700; margin-bottom:8px; }
.quiz-pron { color:var(--accent); font-size:1rem; margin-bottom:16px; font-style:italic; }

.feedback-area { margin:12px 0 16px; padding:12px; border-radius:10px; font-weight:600; font-size:0.95rem; text-align:center; transition:all var(--anim); line-height:1.5; }
.feedback-correct { background:rgba(52,211,153,0.15); color:var(--success); border:1px solid var(--success); }
.feedback-wrong { background:rgba(244,114,182,0.15); color:var(--error); border:1px solid var(--error); }
.fb-root { display:block; margin-top:6px; font-size:0.82rem; font-weight:400; opacity:0.9; line-height:1.45; text-align:left; }
.fb-root b { color:inherit; font-size:1rem; }
.options-grid { display:grid; grid-template-columns:1fr 1fr; gap:12px; }
.option-btn { background:var(--surface-hover); color:var(--text); box-shadow:none; border:2px solid transparent; transition:all var(--anim); padding:13px 10px; font-size:0.95rem; }
.option-btn:hover { background:#2a2f3e; }
.option-btn.correct { background:var(--success); color:#000; border-color:#2dd4bf; }
.option-btn.wrong { background:var(--error); color:#000; border-color:#f9a8d4; opacity:0.8; }
.next-btn { margin-top:16px; background:var(--surface-hover); color:var(--text); border:1px solid var(--text-dim); box-shadow:none; }
.next-btn:hover { background:var(--accent); border-color:var(--accent); color:#fff; }

.result-card { text-align:center; background:var(--surface); padding:40px 20px; border-radius:var(--radius); box-shadow:var(--shadow); }
.result-card h3 { margin-bottom:12px; color:var(--success); font-size:1.4rem; }
.result-card p { color:var(--text-dim); margin-bottom:24px; line-height:1.5; }

.hidden { display:none !important; }

.prizes-container { display:flex; flex-wrap:wrap; gap:10px; justify-content:center; margin:20px 0; }
.prize-item { background: linear-gradient(135deg, rgba(251,191,36,0.12), rgba(251,191,36,0.04)); border:1px solid rgba(251,191,36,0.3); border-radius:10px; padding:8px 14px; display:flex; align-items:center; gap:8px; animation:prizeIn 500ms ease both; }
@keyframes prizeIn { from{opacity:0;transform:scale(0.5)} to{opacity:1;transform:scale(1)} }
.prize-icon { font-size:1.4rem; }
.prize-label { font-size:0.85rem; font-weight:600; color:var(--gold); }

#celebration-overlay { position:fixed; top:18px; left:50%; z-index:1000; transform:translateX(-50%); pointer-events:none; }
.cel-content { text-align:center; animation:celebPop 700ms ease forwards; }
.cel-emoji { font-size:1.5rem; font-weight:800; color:var(--success); display:block; line-height:1; background:var(--surface); border:1px solid var(--success); border-radius:999px; padding:8px 14px; box-shadow:0 4px 16px rgba(52,211,153,0.3); }
@keyframes celebPop {
  0% { opacity:0; transform:translateX(-50%) translateY(-8px) scale(0.85); }
  25% { opacity:1; transform:translateX(-50%) translateY(0) scale(1); }
  75% { opacity:1; transform:translateX(-50%) translateY(0) scale(1); }
  100% { opacity:0; transform:translateX(-50%) translateY(-6px) scale(0.95); }
}

@media(max-width:400px){
  .options-grid { grid-template-columns:1fr; }
  .hb-text, .quiz-word { font-size:1.9rem; }
  .root-letters { font-size:1.25rem; letter-spacing:3px; }
  .speak-btn { width:36px; height:36px; }
  .word-tab { font-size:1.05rem; padding:10px 4px; }
  .note-block { font-size:0.82rem; }
}
@media(prefers-color-scheme:light){
  :root { --bg:#f4f5f7; --surface:#fff; --surface-hover:#eef0f4; --accent:#6d58e0; --accent-glow:rgba(109,88,224,0.2); --text:#1a1d26; --text-dim:#5a6075; --success:#10b981; --error:#ef4444; --gold:#d97706; --gold-glow:rgba(217,119,6,0.2); --shadow:0 8px 24px rgba(0,0,0,0.08); --root-bg:rgba(109,88,224,0.06); --root-border:rgba(109,88,224,0.25); }
  html { color-scheme:light; }
  .sense { background:rgba(109,88,224,0.05); }
}
html[data-theme="light"]{
  --bg:#f4f5f7; --surface:#fff; --surface-hover:#eef0f4; --accent:#6d58e0; --accent-glow:rgba(109,88,224,0.2);
  --text:#1a1d26; --text-dim:#5a6075; --success:#10b981; --error:#ef4444; --gold:#d97706; --gold-glow:rgba(217,119,6,0.2);
  --shadow:0 8px 24px rgba(0,0,0,0.08); --root-bg:rgba(109,88,224,0.06); --root-border:rgba(109,88,224,0.25);
}
html[data-theme="light"] { color-scheme:light; }
html[data-theme="light"] .sense { background:rgba(109,88,224,0.05); }