:root{--primary: #667eea;--primary-dark: #5a67d8;--secondary: #764ba2;--bg: #0f0f1a;--bg-card: #1a1a2e;--bg-elevated: #252540;--text: #e2e8f0;--text-muted: #94a3b8;--border: #2d2d4a;--success: #48bb78;--danger: #f56565;--radius: 12px;--shadow: 0 4px 24px rgba(0, 0, 0, .3)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;overflow-x:hidden}#app{min-height:100vh;display:flex;flex-direction:column}button{cursor:pointer;border:none;outline:none;font-family:inherit}input,textarea{font-family:inherit;outline:none}a{text-decoration:none;color:inherit}.container{max-width:900px;margin:0 auto;padding:0 20px;width:100%}.nav{position:sticky;top:0;z-index:100;background:#0f0f1ad9;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-bottom:1px solid var(--border);padding:16px 0}.nav-inner{display:flex;align-items:center;justify-content:space-between}.nav-logo{display:flex;align-items:center;gap:10px;font-size:1.2rem;font-weight:700;background:linear-gradient(135deg,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.nav-logo svg{width:28px;height:28px}.nav-links{display:flex;gap:8px}.nav-links a{padding:8px 16px;border-radius:8px;font-size:.9rem;font-weight:500;color:var(--text-muted);transition:all .2s}.nav-links a:hover,.nav-links a.active{background:var(--bg-elevated);color:var(--text)}.nav-links a.active{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff}.page{flex:1;padding:24px 0 120px}.song-list{display:flex;flex-direction:column;gap:8px}.song-item{display:flex;align-items:center;gap:14px;padding:12px 16px;background:var(--bg-card);border-radius:var(--radius);cursor:pointer;transition:all .2s;border:1px solid transparent}.song-item:hover{background:var(--bg-elevated);border-color:var(--border)}.song-item.playing{border-color:var(--primary);background:#667eea14}.song-cover{width:48px;height:48px;border-radius:8px;object-fit:cover;flex-shrink:0}.song-info{flex:1;min-width:0}.song-title{font-size:.95rem;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.song-artist{font-size:.82rem;color:var(--text-muted);margin-top:2px}.song-duration{font-size:.8rem;color:var(--text-muted);flex-shrink:0}.song-actions{display:flex;gap:8px;flex-shrink:0}.btn-icon{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:transparent;color:var(--text-muted);transition:all .2s}.btn-icon:hover{background:var(--bg-elevated);color:var(--text)}.btn-icon.favorited{color:var(--danger)}.player-bar{position:fixed;bottom:0;left:0;right:0;z-index:200;background:#1a1a2ef2;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-top:1px solid var(--border);padding:12px 20px}.player-inner{max-width:900px;margin:0 auto;display:flex;flex-direction:column;gap:10px}.player-main{display:flex;align-items:center;gap:14px}.player-song-info{flex:1;min-width:0;display:flex;align-items:center;gap:12px}.player-cover{width:44px;height:44px;border-radius:8px;object-fit:cover}.player-text{min-width:0}.player-title{font-size:.9rem;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.player-artist{font-size:.78rem;color:var(--text-muted)}.player-controls{display:flex;align-items:center;gap:12px}.btn-play{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;display:flex;align-items:center;justify-content:center;transition:transform .2s}.btn-play:hover{transform:scale(1.08)}.btn-control{width:36px;height:36px;border-radius:50%;background:transparent;color:var(--text-muted);display:flex;align-items:center;justify-content:center;transition:all .2s}.btn-control:hover{color:var(--text)}.progress-bar{width:100%;height:4px;background:var(--border);border-radius:2px;cursor:pointer;position:relative}.progress-bar:hover{height:6px}.progress-fill{height:100%;background:linear-gradient(90deg,var(--primary),var(--secondary));border-radius:2px;transition:width .1s linear}.progress-time{display:flex;justify-content:space-between;font-size:.72rem;color:var(--text-muted);margin-top:4px}.recommend-input-area{margin-bottom:24px}.recommend-input-area textarea{width:100%;padding:16px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);color:var(--text);font-size:1rem;resize:none;min-height:100px;transition:border-color .2s}.recommend-input-area textarea:focus{border-color:var(--primary)}.recommend-input-area textarea::placeholder{color:var(--text-muted)}.btn-recommend{margin-top:12px;width:100%;padding:14px;background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;border-radius:var(--radius);font-size:1rem;font-weight:600;transition:opacity .2s}.btn-recommend:hover{opacity:.9}.btn-recommend:disabled{opacity:.5;cursor:not-allowed}.recommend-result{margin-top:24px}.recommend-summary{padding:16px;background:#667eea1a;border:1px solid rgba(102,126,234,.2);border-radius:var(--radius);margin-bottom:16px;font-size:.95rem;line-height:1.5}.recommend-item{display:flex;align-items:center;gap:14px;padding:14px 16px;background:var(--bg-card);border-radius:var(--radius);margin-bottom:10px;border:1px solid var(--border)}.recommend-reason{font-size:.82rem;color:var(--primary);margin-top:4px}.loading{display:flex;align-items:center;justify-content:center;padding:40px;color:var(--text-muted);gap:10px}.spinner{width:20px;height:20px;border:2px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.empty-state{text-align:center;padding:60px 20px;color:var(--text-muted)}.empty-state svg{width:64px;height:64px;margin-bottom:16px;opacity:.5}.empty-state p{font-size:1rem}.page-header{margin-bottom:24px}.page-header h1{font-size:1.5rem;font-weight:700}.page-header p{color:var(--text-muted);margin-top:4px;font-size:.9rem}.mood-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}.mood-tag{padding:6px 14px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:20px;font-size:.82rem;color:var(--text-muted);transition:all .2s}.mood-tag:hover{border-color:var(--primary);color:var(--primary);background:#667eea14}@media (max-width: 640px){.nav-logo span{display:none}.song-item{padding:10px 12px;gap:10px}.song-cover{width:40px;height:40px}.song-duration{display:none}.player-bar{padding:10px 16px}.player-cover{width:38px;height:38px}.btn-play{width:40px;height:40px}.progress-time{display:none}}