/* AI 粵曲助手 - 對話式前端原型樣式 */
:root {
    --ink:#0E0B14; --ink-2:#161122; --ink-3:#221A30;
    --red:#C8102E; --gold:#E8B73C; --jade:#2A9D8F;
    --ivory:#F7F1E3; --text:#EDE3CC; --mute:#A89B82; --dim:#6B6053;
    --line:rgba(232,183,60,0.18);
    --grad-gold:linear-gradient(135deg,#F5D77A,#E8B73C 45%,#B8901C);
    --grad-red:linear-gradient(135deg,#E63946,#C8102E,#8B0A1F);
    --font-zh:"Noto Serif HK","Source Han Serif TC",serif;
    --font-sans:"Noto Sans HK","PingFang TC","Microsoft JhengHei",sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0;}
body{font-family:var(--font-sans);background:#0a070f;color:var(--text);
    display:flex;justify-content:center;align-items:center;min-height:100vh;padding:20px;}
.ai-app{width:100%;max-width:480px;height:90vh;min-height:600px;
    background:linear-gradient(180deg,var(--ink) 0%,var(--ink-2) 100%);
    border-radius:24px;border:1px solid var(--line);overflow:hidden;
    display:flex;flex-direction:column;box-shadow:0 20px 60px rgba(0,0,0,0.6);}
.ai-header{padding:16px 20px;background:rgba(232,183,60,0.08);
    border-bottom:1px solid var(--line);display:flex;align-items:center;gap:12px;}
.ai-orb{width:40px;height:40px;border-radius:50%;
    background:radial-gradient(circle,var(--gold) 0%,var(--red) 60%,transparent 80%);
    box-shadow:0 0 20px rgba(232,183,60,0.5);position:relative;}
.ai-orb::after{content:"AI";position:absolute;inset:0;display:flex;
    align-items:center;justify-content:center;font-size:12px;color:var(--ink);font-weight:900;}
.ai-title{font-family:var(--font-zh);font-size:18px;color:var(--ivory);font-weight:700;}
.ai-sub{font-size:11px;color:var(--mute);
    display:flex;align-items:center;gap:6px;}
.ai-sub .dot{width:6px;height:6px;border-radius:50%;background:var(--jade);
    box-shadow:0 0 8px var(--jade);}
.ai-body{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:14px;}
.ai-body::-webkit-scrollbar{width:4px;}
.ai-body::-webkit-scrollbar-thumb{background:var(--line);border-radius:2px;}

.msg{display:flex;gap:10px;max-width:90%;}
.msg.user{align-self:flex-end;flex-direction:row-reverse;}
.ai-avatar{width:32px;height:32px;border-radius:50%;background:var(--grad-red);
    display:flex;align-items:center;justify-content:center;font-size:14px;flex-shrink:0;}
.user-avatar{width:32px;height:32px;border-radius:50%;background:var(--grad-gold);
    display:flex;align-items:center;justify-content:center;color:var(--ink);
    font-weight:700;font-size:13px;flex-shrink:0;}
.bubble{background:var(--ink-3);border:1px solid var(--line);border-radius:14px;
    padding:12px 16px;font-size:14px;line-height:1.7;color:var(--text);}
.msg.user .bubble{background:rgba(232,183,60,0.15);border-color:rgba(232,183,60,0.4);}

.suggest-chips{display:flex;gap:6px;flex-wrap:wrap;margin-top:8px;}
.chip{font-size:12px;padding:6px 12px;border-radius:14px;background:rgba(232,183,60,0.1);
    border:1px solid var(--line);color:var(--gold);cursor:pointer;transition:all .2s;}
.chip:hover{background:rgba(232,183,60,0.25);}

.song-rec{display:flex;gap:12px;padding:12px;border-radius:12px;
    background:rgba(232,183,60,0.06);border:1px solid var(--line);margin-top:8px;
    align-items:center;cursor:pointer;transition:all .2s;}
.song-rec:hover{border-color:var(--gold);transform:translateX(4px);}
.song-rec .cover{width:48px;height:48px;border-radius:10px;background:var(--grad-red);
    display:flex;align-items:center;justify-content:center;font-size:20px;flex-shrink:0;}
.song-rec h4{font-size:14px;color:var(--ivory);margin:0;}
.song-rec p{font-size:11px;color:var(--mute);margin:2px 0;}
.tag{font-size:10px;padding:2px 8px;border-radius:8px;background:rgba(42,157,143,0.15);
    color:var(--jade);margin-right:4px;}

.plan-box{margin-top:8px;padding:12px;border-radius:10px;
    background:rgba(42,157,143,0.08);border:1px solid rgba(42,157,143,0.25);}
.plan-box h5{font-size:13px;color:var(--jade);margin:0 0 6px;}
.plan-step{font-size:12px;color:var(--text);padding:4px 0;display:flex;gap:8px;}
.plan-step .n{color:var(--gold);font-weight:700;}

.score-box{margin-top:8px;display:grid;grid-template-columns:repeat(4,1fr);gap:6px;}
.score-item{text-align:center;padding:8px 4px;background:rgba(255,255,255,0.04);
    border-radius:10px;border:1px solid var(--line);}
.score-item b{display:block;font-family:var(--font-zh);font-size:20px;color:var(--gold);}
.score-item small{font-size:10px;color:var(--mute);}
.score-total{margin-top:8px;text-align:center;padding:8px;background:var(--grad-gold);
    color:var(--ink);border-radius:10px;font-weight:700;font-family:var(--font-zh);font-size:16px;}

.ai-input{padding:14px 16px;border-top:1px solid var(--line);background:var(--ink);
    display:flex;gap:8px;align-items:center;}
.ai-input input{flex:1;background:var(--ink-3);border:1px solid var(--line);
    border-radius:20px;padding:10px 16px;color:var(--text);font-size:14px;outline:none;font-family:inherit;}
.ai-input input:focus{border-color:var(--gold);}
.ai-input button{width:40px;height:40px;border-radius:50%;background:var(--grad-gold);
    color:var(--ink);border:none;font-size:16px;cursor:pointer;}
.typing{display:flex;gap:4px;padding:8px 12px;}
.typing span{width:7px;height:7px;border-radius:50%;background:var(--mute);
    animation:blink 1.2s infinite;}
.typing span:nth-child(2){animation-delay:.2s;}
.typing span:nth-child(3){animation-delay:.4s;}
@keyframes blink{0%,100%{opacity:.3;}50%{opacity:1;}}

/* ===== V2 擴展：Tab 欄 + 評分 + 陪練 ===== */
.ai-tabs{display:flex;gap:4px;padding:6px 16px;background:rgba(232,183,60,0.04);
    border-bottom:1px solid var(--line);}
.ai-tab{flex:1;padding:10px;text-align:center;border:none;background:none;
    color:var(--mute);font-size:13px;font-weight:600;cursor:pointer;border-radius:10px;
    transition:all .2s;font-family:inherit;}
.ai-tab.active{background:rgba(232,183,60,0.15);color:var(--gold);}
.ai-tab:hover{color:var(--gold);}
.ai-tab i{display:block;font-size:18px;margin-bottom:4px;}

.ai-score-panel{padding:20px;}
.ai-score-intro{font-size:13px;color:var(--mute);margin-bottom:16px;line-height:1.6;}
.ai-drop{border:2px dashed var(--line);border-radius:14px;padding:24px;text-align:center;
    margin-bottom:16px;transition:all .2s;cursor:pointer;background:rgba(255,255,255,0.02);}
.ai-drop:hover,.ai-drop.dragover{border-color:var(--gold);background:rgba(232,183,60,0.06);}
.ai-drop-icon{font-size:36px;margin-bottom:8px;}
.ai-drop-text{font-size:13px;color:var(--mute);}
.ai-drop-filename{font-size:12px;color:var(--gold);margin-top:8px;word-break:break-all;}
.ai-score-btn{width:100%;padding:12px;border-radius:14px;border:none;
    background:var(--grad-gold);color:var(--ink);font-weight:700;font-size:15px;
    cursor:pointer;font-family:inherit;transition:all .2s;}
.ai-score-btn:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(232,183,60,0.3);}
.ai-score-btn:disabled{opacity:.5;cursor:not-allowed;transform:none;}
.ai-score-result{display:none;margin-top:18px;}
.ai-score-result.show{display:block;animation:fade .4s;}
@keyframes fade{from{opacity:0;transform:translateY(8px);}to{opacity:1;transform:none;}}
.ai-score-tiles{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:14px 0;}
.ai-score-tile{background:var(--ink-3);border:1px solid var(--line);border-radius:12px;
    padding:12px 4px;text-align:center;}
.ai-score-tile b{display:block;font-family:var(--font-zh);font-size:22px;color:var(--gold);line-height:1;}
.ai-score-tile small{font-size:10px;color:var(--mute);display:block;margin-top:4px;}
.ai-score-total{background:var(--grad-gold);color:var(--ink);border-radius:12px;padding:12px;
    text-align:center;font-weight:800;font-family:var(--font-zh);font-size:18px;}
.ai-score-tips{margin-top:12px;font-size:12px;color:var(--mute);line-height:1.7;}
.ai-score-tip{padding:6px 10px;background:rgba(200,16,46,0.06);border-left:3px solid var(--red);
    border-radius:6px;margin-bottom:6px;}
.ai-score-meta{font-size:11px;color:var(--dim);text-align:center;margin-top:8px;}

/* 陪練 Tab */
.ai-practice{padding:20px;}
.ai-pra-empty{text-align:center;color:var(--mute);font-size:13px;padding:24px;}
.ai-pra-steps{display:flex;flex-direction:column;gap:10px;}
.ai-pra-step{display:flex;gap:12px;padding:12px;border-radius:12px;background:var(--ink-3);
    border:1px solid var(--line);align-items:center;}
.ai-pra-step .num{width:32px;height:32px;border-radius:50%;background:var(--grad-red);
    color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;
    font-size:13px;flex-shrink:0;}
.ai-pra-step.done .num{background:var(--grad-gold);color:var(--ink);}
.ai-pra-step.done{opacity:.7;}
.ai-pra-step.active{border-color:var(--gold);box-shadow:0 0 16px rgba(232,183,60,0.2);}
.ai-pra-step h4{font-size:13px;color:var(--ivory);margin:0;}
.ai-pra-step p{font-size:11px;color:var(--mute);margin:2px 0 0;}
.ai-pra-song-pick{background:var(--ink-3);border:1px solid var(--line);border-radius:12px;
    padding:12px;margin-bottom:14px;}
.ai-pra-song-pick label{font-size:12px;color:var(--mute);display:block;margin-bottom:6px;}
.ai-pra-song-pick select{width:100%;background:var(--ink);border:1px solid var(--line);
    color:var(--text);padding:10px;border-radius:10px;font-size:13px;font-family:inherit;}

.ai-error{color:#E63946;font-size:13px;text-align:center;padding:10px;background:rgba(230,57,70,0.08);
    border-radius:10px;margin-top:8px;display:none;}
.ai-error.show{display:block;}