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.flashcard-inner{transform:rotateY(180deg)}.flashcard-face{position:absolute;top:0;right:0;bottom:0;left:0;backface-visibility:hidden;border-radius:var(--radius);border:1px solid var(--border);background:linear-gradient(160deg,var(--card),var(--card-2));box-shadow:var(--shadow);padding:28px;display:flex;flex-direction:column}.flashcard-back{transform:rotateY(180deg);overflow-y:auto}.big-word{font-size:2.6rem;font-weight:800;letter-spacing:.5px}.phonetic{color:var(--primary-2);font-size:1.1rem}.meaning-block{margin-bottom:14px}.definition{margin:4px 0}.example{color:var(--text-dim);font-style:italic;border-left:3px solid var(--primary);padding-left:10px;margin:6px 0}.grade-row{display:flex;gap:10px;flex-wrap:wrap;justify-content:center}.word-row{display:flex;align-items:center;flex-wrap:wrap;gap:10px 14px;padding:12px 16px;border-radius:12px;border:1px solid var(--border);background:var(--card);transition:border-color .15s ease}.word-row:hover{border-color:var(--primary)}.word-row .w{font-weight:700;font-size:1.05rem;min-width:0;overflow-wrap:anywhere}.status-dot{width:10px;height:10px;border-radius:50%;flex-shrink:0}.status-new{background:var(--muted)}.status-learning{background:var(--warning)}.status-known{background:var(--success)}.option{text-align:left;padding:15px 18px;border-radius:12px;border:1px solid var(--border);background:var(--card);font-weight:600;font-size:1rem;transition:all .12s ease}.option:hover:not(:disabled){border-color:var(--primary)}.option.correct{background:var(--success-soft);border-color:var(--success)}.option.wrong{background:var(--danger-soft);border-color:var(--danger)}.mic-btn{width:110px;height:110px;border-radius:50%;display:grid;place-items:center;font-size:2.6rem;background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;box-shadow:var(--shadow);transition:transform .15s ease}.mic-btn:hover{transform:scale(1.05)}.mic-btn.listening{animation:pulse 1.2s ease-in-out infinite}@keyframes pulse{0%,to{box-shadow:0 0 #6366f199}50%{box-shadow:0 0 0 22px #6366f100}}.score-ring{font-size:2.4rem;font-weight:800}.hero{border-radius:20px;padding:34px;background:radial-gradient(600px 200px at 90% -20%,rgba(129,140,248,.25),transparent),linear-gradient(135deg,#232945,#1a1f36);border:1px solid var(--border);margin-bottom:26px}.hero h1{font-size:2.2rem}html[data-theme=light] .hero{background:radial-gradient(600px 200px at 90% -20%,rgba(99,102,241,.16),transparent),linear-gradient(135deg,#fff,#eef1fb)}@media (max-width: 560px){.hero h1{font-size:1.6rem}}.pill-row{display:flex;gap:8px;flex-wrap:wrap}.empty-state{text-align:center;padding:50px 20px;color:var(--text-dim)}.empty-state .big{font-size:3rem;margin-bottom:8px}.level-bar{height:8px;border-radius:999px;background:var(--bg-soft);overflow:hidden;margin-top:8px}.level-bar>span{display:block;height:100%;border-radius:999px}.toolbar{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-bottom:18px}.select{padding:10px 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var(--border);border-radius:var(--radius);padding:14px;background:var(--card)}}.form-box{background:linear-gradient(160deg,var(--card),var(--card-2))}.formula{font-family:Consolas,Courier New,monospace;font-size:1.02rem;font-weight:600;color:var(--primary-2);background:var(--bg-soft);border:1px dashed var(--border);border-radius:10px;padding:12px 14px;margin-bottom:8px;line-height:1.7}.formula:last-child{margin-bottom:0}.point-block{padding:14px 0;border-bottom:1px solid var(--border)}.point-block:last-child{border-bottom:none;padding-bottom:0}.tips-box{border-left:4px solid var(--warning)}.tips-box li{color:var(--text-dim)}.pair-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:8px 0;border-bottom:1px solid var(--border)}.pair-row:last-child{border-bottom:none}.pair-word{display:inline-flex;align-items:center;gap:8px;padding:8px 14px;border-radius:10px;background:var(--bg-soft);border:1px solid var(--border);font-weight:700;font-size:1.02rem;color:var(--text)}.pair-vs{color:var(--muted);font-size:.8rem;font-weight:700}.pair-note{flex:1 1 100%;font-size:.85rem}@media (min-width: 620px){.pair-note{flex:1}}html[data-theme=light]{--bg: #f4f6fc;--bg-soft: #e9edf7;--card: #ffffff;--card-2: #f2f5fb;--border: #dde2ee;--text: #1a1f36;--text-dim: #4c5673;--muted: #5d6680;--primary: #4f46e5;--primary-2: #5650e6;--primary-soft: rgba(79, 70, 229, .12);--success-soft: rgba(22, 163, 74, .14);--danger-soft: rgba(220, 38, 38, .12);--shadow: 0 10px 30px rgba(30, 41, 90, .12);--shadow-sm: 0 4px 14px rgba(30, 41, 90, .08)}html[data-theme=light] body{background:radial-gradient(1200px 600px at 20% -10%,#e6ebfb 0%,var(--bg) 55%) no-repeat var(--bg)}html[data-theme=light] .navbar{background:#ffffffd1}html[data-theme=light] .nav-link.active{color:#fff}html[data-theme=light] .example{color:var(--text-dim)}html[data-theme=light] .eyebrow,html[data-theme=light] .link-btn{color:var(--primary)}.theme-toggle{width:42px;height:42px;border-radius:50%;display:grid;place-items:center;background:var(--card);border:1px solid var(--border);font-size:1.05rem;flex-shrink:0;transition:border-color .15s ease,transform .15s ease}.theme-toggle:hover{border-color:var(--primary);transform:rotate(12deg)}.toast{position:fixed;right:20px;bottom:20px;z-index:200;display:flex;align-items:center;gap:14px;max-width:340px;padding:16px 18px;border-radius:16px;background:linear-gradient(135deg,var(--card),var(--card-2));border:1px solid var(--primary);box-shadow:var(--shadow);cursor:pointer;animation:toast-in .4s cubic-bezier(.2,.8,.2,1)}@keyframes toast-in{0%{opacity:0;transform:translateY(20px) scale(.96)}to{opacity:1;transform:none}}.toast-icon{font-size:2.2rem;width:54px;height:54px;display:grid;place-items:center;border-radius:12px;background:var(--primary-soft);flex-shrink:0}.toast-title{font-size:.72rem;text-transform:uppercase;letter-spacing:1px;font-weight:800;color:var(--primary-2)}.toast-name{font-weight:800;font-size:1.05rem}.toast-desc{font-size:.85rem;color:var(--text-dim)}.badge-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px}.badge{text-align:center;padding:16px 12px;border-radius:14px;border:1px solid var(--border);background:var(--card);transition:transform .15s ease}.badge.locked{border-style:dashed}.badge.locked .b-icon{opacity:.4;filter:grayscale(1)}.badge.locked .b-name{color:var(--text-dim)}.badge.unlocked:hover{transform:translateY(-3px);border-color:var(--primary)}.badge .b-icon{font-size:2rem}.badge .b-name{font-weight:700;font-size:.92rem;margin-top:4px}.badge 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