:root{--bg-0: #0b0b0f;--bg-1: #16161d;--bg-2: #1f1f29;--bg-3: #2a2a37;--line: rgba(255, 255, 255, .08);--text-1: #f5f5f7;--text-2: #b6b6c2;--text-3: #7c7c89;--brand-1: #ff6ec7;--brand-2: #8a6cff;--brand-3: #4ea3ff;--gradient: linear-gradient(135deg, #ff6ec7 0%, #8a6cff 50%, #4ea3ff 100%);--success: #4ade80;--warning: #fbbf24;--danger: #f87171;--shadow-1: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.3);--shadow-2: 0 4px 16px rgba(138, 108, 255, .25)}*{box-sizing:border-box;-webkit-font-smoothing:antialiased}html,body,#root{height:100%;margin:0;padding:0}body{background:var(--bg-0);color:var(--text-1);font-family:Noto Sans TC,Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:15px;line-height:1.6;overflow:hidden}button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}input,textarea{font-family:inherit}.app{display:flex;height:100vh;background:radial-gradient(circle at 0% 0%,rgba(138,108,255,.08),transparent 50%),radial-gradient(circle at 100% 100%,rgba(255,110,199,.06),transparent 50%),var(--bg-0)}.sidebar{width:280px;background:var(--bg-1);border-right:1px solid var(--line);display:flex;flex-direction:column;flex-shrink:0;transition:width .2s ease}.sidebar.collapsed{width:64px}.sidebar-header{padding:20px 16px;display:flex;align-items:center;gap:12px}.logo{width:36px;height:36px;border-radius:10px;background:var(--gradient);display:flex;align-items:center;justify-content:center;font-size:20px;flex-shrink:0}.logo-text{font-size:16px;font-weight:600;letter-spacing:.02em;white-space:nowrap}.sidebar.collapsed .logo-text,.sidebar.collapsed .sidebar-section-title,.sidebar.collapsed .nav-item span,.sidebar.collapsed .song-mini-title,.sidebar.collapsed .new-btn span{display:none}.new-btn{margin:8px 12px 16px;padding:12px 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20s infinite alternate ease-in-out}.blob-1{width:500px;height:500px;background:var(--brand-2);top:-100px;left:-100px}.blob-2{width:400px;height:400px;background:var(--brand-1);bottom:-50px;right:-50px;animation-delay:-5s}.blob-3{width:300px;height:300px;background:var(--brand-3);top:40%;left:30%;animation-delay:-10s}@keyframes blob-move{0%{transform:translate(0) scale(1)}33%{transform:translate(100px,50px) scale(1.1)}66%{transform:translate(-50px,100px) scale(.9)}to{transform:translate(0) scale(1)}}.app{position:relative;z-index:1;display:flex;height:100vh;background:transparent}.welcome-greeting{font-size:48px;font-weight:500;letter-spacing:-.01em;line-height:1.2;background:var(--gradient);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;animation:slide-up .8s cubic-bezier(.4,0,.2,1)}.welcome-sub{font-size:16px;color:var(--text-3);max-width:520px;animation:slide-up .8s cubic-bezier(.4,0,.2,1) .1s 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p{margin:0;color:var(--text-3);font-size:13px;line-height:1.5}.desktop-producer-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}.desktop-producer-card{min-width:0;min-height:74px;display:flex;align-items:center;gap:10px;padding:12px;border-radius:14px;background:#ffffff0b;border:1px solid rgba(255,255,255,.08);color:var(--text-1);text-align:left;transition:border-color .15s,background .15s,transform .15s}.desktop-producer-card:hover:not(:disabled){background:#ffffff13;border-color:#8b5cf66b;transform:translateY(-1px)}.desktop-producer-card.selected{border-color:var(--giftback-purple);background:#8b5cf629;box-shadow:0 0 0 3px #8b5cf61f}.desktop-producer-card .producer-icon{flex:0 0 auto}.desktop-producer-card .producer-name,.desktop-producer-card .producer-tagline{display:block}.chip{padding:14px 20px;border-radius:16px;background:var(--bg-1);border:1px solid var(--line);color:var(--text-2);font-size:14px;text-align:left;max-width:240px;transition:all .2s ease;line-height:1.45}.chip:disabled{opacity:.45;cursor:not-allowed;transform:none}.chip:hover{background:var(--bg-2);color:var(--text-1);border-color:#8a6cff66;transform:translateY(-2px)}.msg{display:flex;gap:14px}.msg-avatar{width:36px;height:36px;border-radius:50%;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:16px;font-weight:600}.msg-avatar.user{background:var(--bg-3);color:var(--text-1)}.msg-avatar.assistant{background:var(--gradient);color:#fff}.msg-body{flex:1;min-width:0}.msg-name{font-size:13px;color:var(--text-3);margin-bottom:4px;font-weight:500}.msg-content{font-size:15px;color:var(--text-1);line-height:1.7;white-space:pre-wrap;word-break:break-word}.generating{display:flex;align-items:center;gap:12px;padding:14px 18px;background:var(--bg-1);border:1px solid var(--line);border-radius:14px;margin-top:8px;width:fit-content}.spinner{width:18px;height:18px;border:2px solid var(--bg-3);border-top-color:var(--brand-2);border-radius:50%;animation:spin .8s linear infinite}.gen-step{font-size:14px;color:var(--text-2)}.song-card{background:var(--bg-1);border:1px solid var(--line);border-radius:18px;overflow:hidden;margin-top:8px;box-shadow:var(--shadow-1);animation:fadeIn .4s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.song-card-head{display:flex;gap:16px;padding:20px}.song-cover{width:96px;height:96px;border-radius:12px;background:var(--gradient);background-size:cover;background-position:center;flex-shrink:0;position:relative;overflow:hidden}.song-cover:after{content:"🎵";position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:32px;opacity:.4}.song-cover[data-has-img=true]:after{display:none}.song-meta{flex:1;min-width:0}.song-title{font-size:20px;font-weight:600;margin:0 0 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var(--line);margin-top:4px}.track-tab{padding:6px 12px;border-radius:8px;font-size:12px;color:var(--text-2);background:var(--bg-2)}.track-tab.active{background:var(--bg-3);color:var(--text-1)}.lyrics-toggle{padding:0 20px 16px}.lyrics-toggle summary{cursor:pointer;font-size:13px;color:var(--text-3);padding:8px 0;list-style:none}.lyrics-toggle summary::-webkit-details-marker{display:none}.lyrics-toggle summary:before{content:"▶ ";display:inline-block;transition:transform .2s}.lyrics-toggle[open] summary:before{transform:rotate(90deg)}.lyrics-body{background:var(--bg-2);padding:16px;border-radius:10px;font-size:13px;line-height:1.9;color:var(--text-2);white-space:pre-wrap;margin-top:8px}.player{display:flex;align-items:center;gap:12px;padding:14px 20px;background:var(--bg-2);border-top:1px solid var(--line)}.play-btn{width:40px;height:40px;border-radius:50%;background:var(--gradient);color:#fff;font-size:16px;display:flex;align-items:center;justify-content:center;flex-shrink:0;box-shadow:var(--shadow-2)}.player-track{flex:1;display:flex;flex-direction:column;gap:4px;min-width:0}.player-progress{height:4px;background:var(--bg-3);border-radius:2px;overflow:hidden;cursor:pointer}.player-progress-fill{height:100%;background:var(--gradient);transition:width .1s linear}.player-time{display:justify-content: space-between;font-size:11px;color:var(--text-3);font-variant-numeric:tabular-nums}.composer{padding:16px 24px 24px;flex-shrink:0}.composer-inner{max-width:820px;margin:0 auto;background:var(--bg-1);border:1px solid var(--line);border-radius:28px;padding:8px 8px 8px 20px;display:flex;align-items:flex-end;gap:8px;transition:border-color .2s,box-shadow .2s}.composer-inner:focus-within{border-color:#8a6cff80;box-shadow:0 0 0 4px #8a6cff1a}.composer textarea{flex:1;border:none;background:transparent;color:var(--text-1);resize:none;font-size:15px;padding:12px 0;outline:none;max-height:200px;line-height:1.5}.composer textarea::placeholder{color:var(--text-3)}.send-btn{width:40px;height:40px;border-radius:50%;background:var(--gradient);color:#fff;display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0;align-self:flex-end;margin-bottom:4px;transition:opacity .15s}.send-btn:disabled{background:var(--bg-3);opacity:.6;cursor:not-allowed}.composer-hint{max-width:820px;margin:8px auto 0;font-size:11px;color:var(--text-3);text-align:center}:root{--giftback-purple: #8b5cf6;--giftback-purple-hover: #7c3aed;--giftback-panel: #1a1a24;--giftback-panel-border: rgba(255, 255, 255, .06);--giftback-input: #12121a}.app-compact{background:#0a0a12}.main-compact{overflow:hidden}.compact-studio{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch}.compact-messages{padding:0 0 32px}.compact-messages .messages{flex:none;overflow:visible;padding-top:8px}.giftback-studio{max-width:800px;margin:0 auto;padding:20px 16px 40px}.giftback-header{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:12px 20px;align-items:center;margin-bottom:28px}.giftback-header-top{display:contents}.giftback-brand{display:flex;align-items:center;gap:12px;grid-column:1;grid-row:1;min-width:0;flex:1 1 auto}.giftback-brand-copy{min-width:0}.brand-mark{display:block;object-fit:cover;flex-shrink:0}.giftback-logo{width:48px;height:48px;border-radius:12px;box-shadow:0 4px 16px #8a6cff40}.giftback-brand-name{font-size:18px;font-weight:700;letter-spacing:.04em;line-height:1.2;white-space:nowrap}.giftback-brand-sub{font-size:10px;color:var(--text-3);letter-spacing:.12em;text-transform:uppercase;margin-top:2px}.giftback-slogan{grid-column:2;grid-row:1;margin:0;font-size:14px;color:var(--text-1);line-height:1.5;max-width:100%;padding:0 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