:root{--bg: #f5f0eb;--bg-card: #ffffff;--bg-input: #f0ece6;--text: #2c2c2c;--text-secondary: #6b6b6b;--primary: #1a3c2a;--primary-light: #2d5a3e;--accent: #c4956a;--accent-light: #e8d5c0;--border: #ddd6ce;--shadow: 0 2px 8px rgba(0,0,0,.06);--radius: 12px;--radius-sm: 8px;--max-width: 800px;--font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif}*{margin:0;padding:0;box-sizing:border-box}html{font-size:16px;-webkit-text-size-adjust:100%}body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh;padding-bottom:80px}a{color:var(--primary);text-decoration:none}a:hover{color:var(--accent)}.app-header{position:sticky;top:0;z-index:100;background:var(--primary);color:#fff;padding:0 16px;height:56px;display:flex;align-items:center;justify-content:space-between;gap:12px}.app-header .logo{font-size:1.1rem;font-weight:700;white-space:nowrap;color:#fff}.app-header .lang-btn{background:#ffffff26;border:1px solid rgba(255,255,255,.3);color:#fff;padding:4px 12px;border-radius:20px;font-size:.8rem;cursor:pointer;white-space:nowrap;transition:background .2s}.app-header .lang-btn:hover{background:#ffffff40}.bottom-nav{position:fixed;bottom:0;left:0;right:0;z-index:100;background:#fff;border-top:1px solid var(--border);display:flex;height:64px;padding-bottom:env(safe-area-inset-bottom)}.bottom-nav a{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;font-size:.7rem;color:var(--text-secondary);transition:color .2s}.bottom-nav a.active{color:var(--primary);font-weight:600}.bottom-nav a svg{width:24px;height:24px}.search-bar{position:relative;max-width:var(--max-width);margin:0 auto}.search-bar input{width:100%;padding:14px 16px 14px 44px;border:2px solid var(--border);border-radius:var(--radius);font-size:1rem;background:var(--bg-input);color:var(--text);outline:none;transition:border-color .2s}.search-bar input:focus{border-color:var(--primary)}.search-bar .search-icon{position:absolute;left:14px;top:50%;transform:translateY(-50%);color:var(--text-secondary);font-size:1.2rem}.container{max-width:var(--max-width);margin:0 auto;padding:16px}.card{background:var(--bg-card);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px;margin-bottom:16px;transition:transform .15s}.card-clickable{cursor:pointer}.card-clickable:active{transform:scale(.99)}.card h3{font-size:1.1rem;margin-bottom:6px;color:var(--primary)}.card p{color:var(--text-secondary);font-size:.9rem;line-height:1.5}.card .meta{font-size:.8rem;color:var(--text-secondary);margin-top:8px}.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px;margin-top:12px}.cat-item{background:var(--bg-card);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px;text-align:center;cursor:pointer;transition:transform .15s,box-shadow .2s}.cat-item:active{transform:scale(.97)}.cat-item .cat-icon{font-size:2rem;margin-bottom:8px}.cat-item .cat-name{font-size:.9rem;color:var(--text)}.cat-item .cat-count{font-size:.75rem;color:var(--text-secondary);margin-top:4px}.section-title{font-size:1.1rem;font-weight:700;margin:20px 0 12px;color:var(--text);display:flex;align-items:center;gap:8px}.concept-detail .name-group{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}.concept-detail .name-lang{background:var(--accent-light);padding:4px 12px;border-radius:20px;font-size:.85rem;color:var(--text)}.concept-detail .name-lang .lang-tag{font-size:.65rem;color:var(--text-secondary);margin-right:4px}.concept-detail h1{font-size:1.5rem;color:var(--primary);margin-bottom:8px}.concept-detail .summary{font-size:1rem;color:var(--text-secondary);margin-bottom:20px}.concept-detail .section-label{font-size:.85rem;font-weight:600;color:var(--primary);margin-top:20px;margin-bottom:8px;padding-bottom:4px;border-bottom:2px solid var(--accent-light)}.concept-detail .section-content{font-size:.95rem;line-height:1.7;color:var(--text)}.concept-detail .related-list{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}.concept-detail .related-chip{background:var(--bg-input);padding:6px 14px;border-radius:20px;font-size:.85rem;color:var(--primary);cursor:pointer;transition:background .2s}.concept-detail .related-chip:hover{background:var(--accent-light)}.svg-container{background:#fff;border:1px solid var(--border);border-radius:var(--radius-sm);padding:16px;margin:12px 0;overflow-x:auto;text-align:center;min-height:80px;display:flex;align-items:center;justify-content:center}.svg-container svg{max-width:100%;height:auto}.calc-btn{background:var(--bg-card);border:2px solid var(--border);border-radius:var(--radius);padding:16px;text-align:center;cursor:pointer;font-size:1rem;transition:all .2s}.calc-btn:active{transform:scale(.96)}.calc-btn.active{border-color:var(--primary);background:var(--primary);color:#fff}.calc-result{margin-top:16px;padding:16px;background:var(--bg-card);border-radius:var(--radius);box-shadow:var(--shadow);min-height:60px}.calc-result .result-item{display:flex;justify-content:space-between;padding:6px 0;border-bottom:1px solid var(--border);font-size:.9rem}.calc-result .result-item:last-child{border:none}.calc-result .result-label{color:var(--text-secondary)}.calc-result .result-value{font-weight:600;color:var(--primary)}.metronome-display{text-align:center;padding:40px 20px}.metronome-display .bpm-value{font-size:4rem;font-weight:800;color:var(--primary);line-height:1}.metronome-display .bpm-label{font-size:1rem;color:var(--text-secondary);margin-top:4px}.metronome-display .beat-indicator{width:24px;height:24px;border-radius:50%;background:var(--border);margin:20px auto;transition:background .05s}.metronome-display .beat-indicator.active{background:var(--accent)}.metronome-display input[type=range]{width:100%;max-width:300px;margin:16px auto;-webkit-appearance:none;height:6px;border-radius:3px;background:var(--border);outline:none}.metronome-display input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:24px;height:24px;border-radius:50%;background:var(--primary);cursor:pointer}.metronome-btn{display:inline-block;padding:14px 48px;border-radius:30px;font-size:1.1rem;font-weight:600;border:none;cursor:pointer;transition:all .2s;color:#fff;background:var(--primary)}.metronome-btn:active{transform:scale(.97)}.metronome-btn.stop{background:#c0392b}.tuner-container{text-align:center;padding:20px}.tuner-container .tuner-note{font-size:4rem;font-weight:800;color:var(--primary)}.tuner-container .tuner-cents{font-size:1.2rem;color:var(--text-secondary);margin-top:4px}.tuner-container .tuner-meter{position:relative;width:100%;max-width:300px;height:8px;background:var(--border);border-radius:4px;margin:20px auto;overflow:hidden}.tuner-container .tuner-meter .needle{position:absolute;top:-4px;width:4px;height:16px;background:var(--accent);border-radius:2px;transition:left .1s}.tuner-container .tuner-meter .center-mark{position:absolute;left:50%;top:-2px;width:2px;height:12px;background:var(--primary);transform:translate(-50%)}.tuner-container .tuner-freq{font-size:.9rem;color:var(--text-secondary)}.tuner-btn{padding:12px 36px;border-radius:30px;font-size:1rem;font-weight:600;border:none;cursor:pointer;transition:all .2s;color:#fff;background:var(--primary);margin-top:20px}.tuner-btn:active{transform:scale(.97)}.tuner-btn.listening{background:#c0392b;animation:pulse 1s infinite}@keyframes pulse{50%{opacity:.7}}.conducting-canvas{width:100%;max-width:400px;margin:0 auto;display:block;border:1px solid var(--border);border-radius:var(--radius-sm)}.conducting-patterns{display:grid;grid-template-columns:repeat(auto-fill,minmax(100px,1fr));gap:8px;margin-top:12px}.conducting-patterns button{padding:10px;border:2px solid var(--border);border-radius:var(--radius-sm);background:var(--bg-card);cursor:pointer;font-size:.9rem;transition:all .2s}.conducting-patterns button.active{border-color:var(--primary);background:var(--primary);color:#fff}.concept-list{display:flex;flex-direction:column;gap:8px}.concept-list-item{display:flex;align-items:center;gap:12px;background:var(--bg-card);border-radius:var(--radius-sm);padding:14px 16px;box-shadow:var(--shadow);cursor:pointer;transition:transform .15s}.concept-list-item:active{transform:scale(.99)}.concept-list-item .concept-name{font-weight:600;font-size:.95rem}.concept-list-item .concept-summary{font-size:.8rem;color:var(--text-secondary);margin-top:2px}.skeleton{background:linear-gradient(90deg,var(--bg-input) 25%,var(--border) 50%,var(--bg-input) 75%);background-size:200% 100%;animation:shimmer 1.5s infinite;border-radius:var(--radius-sm)}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.mt-8{margin-top:8px}.mt-16{margin-top:16px}.mb-16{margin-bottom:16px}.text-center{text-align:center}.flex-center{display:flex;align-items:center;justify-content:center}.gap-8{gap:8px}.hidden{display:none}.staff-svg{font-family:Times New Roman,serif}.staff-svg line{stroke:#333;stroke-width:1}.staff-svg .note-head{fill:#333}.staff-svg .accidental{fill:#333;font-size:14px}.staff-svg .clef{font-size:40px;fill:#333}.staff-svg .time-sig{font-size:18px;fill:#333}.tap-btn{padding:20px 40px;border-radius:var(--radius);font-size:1.2rem;border:2px dashed var(--border);background:var(--bg-input);cursor:pointer;transition:all .2s;color:var(--text);width:100%;margin-top:12px}.tap-btn:active{background:var(--accent-light);border-color:var(--accent)}.beat-selector{display:flex;gap:8px;justify-content:center;margin:12px 0;flex-wrap:wrap}.beat-selector button{padding:8px 16px;border:2px solid var(--border);border-radius:20px;background:var(--bg-card);cursor:pointer;font-size:.85rem;transition:all .2s}.beat-selector button.active{border-color:var(--primary);background:var(--primary);color:#fff}.back-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 0;color:var(--text-secondary);font-size:.9rem;cursor:pointer;background:none;border:none;margin-bottom:12px}.back-btn:hover{color:var(--primary)}.tools-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:12px}.tool-card{background:var(--bg-card);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px 16px;text-align:center;cursor:pointer;transition:transform .15s,box-shadow .2s;border:2px solid transparent}.tool-card:active{transform:scale(.97)}.tool-card:hover{border-color:var(--accent-light)}.tool-card .tool-icon{font-size:2.2rem;margin-bottom:8px}.tool-card .tool-name{font-size:1rem;font-weight:600;color:var(--primary);margin-bottom:4px}.tool-card .tool-desc{font-size:.78rem;color:var(--text-secondary);line-height:1.4}.calculator-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}@media (min-width: 600px){.calculator-grid{grid-template-columns:repeat(4,1fr)}}.tuner-meter-tick{font-size:.7rem;fill:#999}@media (min-width: 600px){.cat-grid{grid-template-columns:repeat(auto-fill,minmax(180px,1fr))}}