:root{--text: #6b6375;--text-h: #08060d;--bg: #fff;--border: #e5e4e7;--code-bg: #f4f3ec;--accent: #aa3bff;--accent-bg: rgba(170, 59, 255, .1);--accent-border: rgba(170, 59, 255, .5);--social-bg: rgba(244, 243, 236, .5);--shadow: rgba(0, 0, 0, .1) 0 10px 15px -3px, rgba(0, 0, 0, .05) 0 4px 6px -2px;--sans: system-ui, "Segoe UI", Roboto, sans-serif;--heading: system-ui, "Segoe UI", Roboto, sans-serif;--mono: ui-monospace, Consolas, monospace;font:18px/145% var(--sans);letter-spacing:.18px;color-scheme:light dark;color:var(--text);background:var(--bg);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@media (max-width: 1024px){:root{font-size:16px}}@media (prefers-color-scheme: dark){:root{--text: #9ca3af;--text-h: #f3f4f6;--bg: #16171d;--border: #2e303a;--code-bg: #1f2028;--accent: #c084fc;--accent-bg: rgba(192, 132, 252, .15);--accent-border: rgba(192, 132, 252, .5);--social-bg: rgba(47, 48, 58, .5);--shadow: rgba(0, 0, 0, .4) 0 10px 15px -3px, rgba(0, 0, 0, .25) 0 4px 6px -2px}#social .button-icon{filter:invert(1) brightness(2)}}#root{width:1126px;max-width:100%;margin:0 auto;text-align:center;border-inline:1px solid var(--border);min-height:100svh;display:flex;flex-direction:column;box-sizing:border-box}body{margin:0}h1,h2{font-family:var(--heading);font-weight:500;color:var(--text-h)}h1{font-size:56px;letter-spacing:-1.68px;margin:32px 0}@media (max-width: 1024px){h1{font-size:36px;margin:20px 0}}h2{font-size:24px;line-height:118%;letter-spacing:-.24px;margin:0 0 8px}@media (max-width: 1024px){h2{font-size:20px}}p{margin:0}code,.counter{font-family:var(--mono);display:inline-flex;border-radius:4px;color:var(--text-h)}code{font-size:15px;line-height:135%;padding:4px 8px;background:var(--code-bg)}:root{--primary: #4CAF50;--primary-light: #81C784;--primary-dark: #388E3C;--secondary: #FF9800;--background: #FAFAFA;--surface: #FFFFFF;--text-primary: #212121;--text-secondary: #757575;--border: #E0E0E0;--success: #4CAF50;--error: #F44336}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background:var(--background);color:var(--text-primary);min-height:100vh;display:flex;justify-content:center;align-items:center}#root{width:100%;max-width:480px;min-height:100vh;background:var(--surface);box-shadow:0 0 20px #0000001a}.btn{padding:12px 24px;border:none;border-radius:12px;font-size:16px;font-weight:600;cursor:pointer;transition:all .2s ease}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark);transform:translateY(-2px)}.btn-secondary{background:var(--surface);color:var(--text-primary);border:2px solid var(--border)}.btn-secondary:hover{border-color:var(--primary);color:var(--primary)}.btn:active{transform:scale(.98)}.card{background:var(--surface);border-radius:16px;padding:20px;box-shadow:0 2px 8px #00000014}.theme-card{display:flex;align-items:center;gap:16px;padding:16px 20px;background:var(--surface);border:2px solid var(--border);border-radius:16px;cursor:pointer;transition:all .2s ease}.theme-card:hover{border-color:var(--primary-light);box-shadow:0 4px 12px #4caf5026}.theme-card.selected{border-color:var(--primary);background:#4caf500d}.theme-card.locked{opacity:.5;cursor:not-allowed}.theme-icon{font-size:40px}.theme-info{flex:1}.theme-name{font-size:18px;font-weight:600;color:var(--text-primary)}.theme-name-en{font-size:14px;color:var(--text-secondary)}.theme-status{font-size:12px;padding:4px 12px;border-radius:20px;background:var(--primary);color:#fff}.theme-status.locked{background:var(--text-secondary)}.game-container{padding:20px;min-height:100vh;display:flex;flex-direction:column}.game-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.game-title{font-size:18px;font-weight:600}.game-progress{font-size:14px;color:var(--text-secondary)}.word-card{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;justify-content:center;align-items:center;z-index:100;animation:fadeIn .2s ease}.word-card-content{background:#fff;border-radius:20px;padding:32px;text-align:center;max-width:320px;width:90%;animation:slideUp .3s ease}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}.word-char{font-size:64px;font-weight:700;color:var(--text-primary);margin-bottom:8px}.word-pinyin{font-size:24px;color:var(--primary);margin-bottom:8px}.word-english{font-size:18px;color:var(--text-secondary);margin-bottom:24px}.word-actions{display:flex;gap:12px;justify-content:center}.word-btn{display:flex;flex-direction:column;align-items:center;gap:4px;padding:12px 20px;border:none;border-radius:12px;cursor:pointer;transition:all .2s ease}.word-btn.speak{background:var(--primary);color:#fff}.word-btn.record{background:var(--secondary);color:#fff}.word-btn.close{background:var(--surface);color:var(--text-secondary);border:2px solid var(--border)}.word-btn-icon{font-size:24px}.word-btn-text{font-size:12px}.board{display:grid;gap:8px;margin:20px auto;width:fit-content}.board-cell{width:64px;height:64px;background:#f5f5f5;border-radius:12px;display:flex;justify-content:center;align-items:center;font-size:28px;font-weight:600;cursor:pointer;transition:all .15s ease;-webkit-user-select:none;user-select:none}.board-cell:hover{transform:scale(1.05)}.board-cell.selected{background:var(--primary-light);transform:scale(1.1)}.board-cell.matched{animation:match .3s ease}@keyframes match{0%{transform:scale(1)}50%{transform:scale(1.2)}to{transform:scale(0);opacity:0}}.options-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:20px}.option-btn{padding:20px;background:#f5f5f5;border:2px solid transparent;border-radius:12px;font-size:24px;font-weight:600;cursor:pointer;transition:all .2s ease}.option-btn:hover{border-color:var(--primary-light);background:#fff}.option-btn.correct{border-color:var(--success);background:#4caf501a}.option-btn.wrong{border-color:var(--error);background:#f443361a}.result-page{text-align:center;padding:40px 20px}.result-icon{font-size:80px;margin-bottom:20px}.result-title{font-size:28px;font-weight:700;margin-bottom:8px}.result-subtitle{font-size:16px;color:var(--text-secondary);margin-bottom:32px}.result-words{margin-bottom:32px}.result-words-title{font-size:14px;color:var(--text-secondary);margin-bottom:12px}.result-words-list{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}.result-word{padding:8px 16px;background:#f5f5f5;border-radius:8px;font-size:16px}.result-actions{display:flex;flex-direction:column;gap:12px}.phase-indicator{display:flex;justify-content:center;gap:8px;margin-bottom:20px}.phase-dot{width:8px;height:8px;border-radius:50%;background:var(--border)}.phase-dot.active{background:var(--primary)}.phase-dot.completed{background:var(--primary-light)}.mic-btn{width:64px;height:64px;border-radius:50%;border:none;cursor:pointer;display:flex;justify-content:center;align-items:center;font-size:28px;transition:all .2s ease}.mic-btn.recording{background:var(--error);animation:pulse 1s infinite}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.1)}}.home-page{padding:40px 20px}.home-title{font-size:32px;font-weight:700;text-align:center;margin-bottom:8px}.home-subtitle{font-size:16px;color:var(--text-secondary);text-align:center;margin-bottom:40px}.themes-section{margin-bottom:32px}.themes-title{font-size:14px;color:var(--text-secondary);margin-bottom:16px;text-transform:uppercase;letter-spacing:1px}.themes-list{display:flex;flex-direction:column;gap:12px}