:root{--bg:#f4f6f8;--ink:#162033;--muted:#667085;--line:#cbd5e1;--panel:#fff;--blue:#276ef1;--green:#00a676;--red:#d95d39;--gold:#f2b84b}
    *{box-sizing:border-box} body{margin:0;background:var(--bg);color:var(--ink);font-family:Arial,"Microsoft JhengHei",sans-serif}
    button,input,select,textarea{font:inherit} button{border:0;border-radius:8px;background:var(--blue);color:white;font-weight:800;padding:10px 14px;cursor:pointer} button:disabled{opacity:.45;cursor:not-allowed}
    button.secondary{background:#edf2f7;color:#253348} button.danger{background:#fff1f0;color:var(--red)}
    input,select,textarea{width:100%;border:1px solid var(--line);border-radius:8px;padding:10px;background:white;color:var(--ink)} textarea{min-height:86px;resize:vertical}
    h1,h2,h3,p{margin-top:0}.app{padding:16px}.top{display:flex;justify-content:space-between;gap:16px;align-items:center;background:white;border:1px solid var(--line);border-radius:8px;padding:14px 18px;margin-bottom:12px}.top h1{margin:0;font-size:30px}.eyebrow{font-size:12px;font-weight:900;color:var(--red);margin-bottom:4px}.progress{min-width:250px}.track{height:10px;background:#e6edf3;border-radius:999px;overflow:hidden;margin-top:8px}.bar{height:100%;background:linear-gradient(90deg,var(--blue),var(--green))}
    .layout{display:grid;grid-template-columns:minmax(0,1fr) 380px;gap:12px}.panel,.preview,.teacher{background:white;border:1px solid var(--line);border-radius:8px}.preview{align-self:start;position:sticky;top:12px;padding:12px}.teacher{display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:start;margin-bottom:12px;padding:16px}.avatar{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:50%;background:var(--gold);font-weight:900}.teacher h2{font-size:21px;margin-bottom:7px}.teacher p{font-size:15px;line-height:1.55;color:#344054;margin-bottom:7px}.nav{display:flex;gap:8px;align-self:center}
    .panel{min-height:calc(100vh - 208px);padding:18px}.panelHead{border-bottom:1px solid #e3eaf1;margin-bottom:14px;padding-bottom:10px}.panelHead h2{font-size:24px;margin-bottom:5px}.hint,.small{font-size:13px;color:var(--muted)}.row{display:flex;gap:10px;align-items:center}.row.wrap{flex-wrap:wrap}.row.stack>*{flex:1}.cardGrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}.card,.mini,.drop,.surface,.connectDrop,.introBox{background:white;border:1px solid var(--line);border-radius:8px;padding:12px}.card{display:grid;gap:9px}.mini{margin-top:8px;cursor:grab}.badge{display:inline-flex;border:1px solid;border-radius:999px;padding:3px 8px;font-size:12px;font-weight:900;background:white;width:max-content}.meta{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.columns{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:12px}.columns.two{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}.drop{min-height:190px;background:#f8fafc;border-style:dashed}.add{display:grid;grid-template-columns:1fr auto;gap:8px;background:#f8fafc;border:1px solid #e3eaf1;border-radius:8px;padding:10px;margin-bottom:12px}.ok{background:#eaf7f1;color:#12623d;font-weight:800;border-radius:8px;padding:10px}.warn{background:#fff7ed;color:#9a3412;border-radius:8px;padding:10px}.error{background:#fff1f0;color:#b42318;border-radius:8px;padding:10px;margin-top:10px}
    .sourceEditor{display:grid;grid-template-columns:16px minmax(120px,260px) auto auto;gap:8px;align-items:center;margin-bottom:8px;max-width:620px}.sourceEditor input{max-width:260px}.sourceEditor button{white-space:nowrap}.dot{width:14px;height:14px;border-radius:50%}.mode{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:16px}.mode button{min-height:70px}.selected{background:var(--green)!important;color:white!important}.choice{display:flex;gap:8px;align-items:center;text-align:left;background:#f8fafc;color:var(--ink);border:1px solid var(--line);margin-bottom:8px;width:100%;justify-content:flex-start}.choice.selected{border-color:var(--green);background:#eaf7f1;color:var(--ink)}
    .speakBox{background:#f8fafc;border:1px solid #e3eaf1;border-radius:8px;padding:12px;margin-bottom:14px}.speakBox label{display:block;font-weight:800;margin-bottom:6px}.speakControls{display:grid;grid-template-columns:minmax(160px,220px) auto;gap:8px;margin-top:8px}.voiceStatus{font-size:13px;color:var(--muted);margin-top:8px}.startPanel{background:white;border:1px solid var(--line);border-radius:8px;min-height:calc(100vh - 140px);display:grid;place-items:center;text-align:center;padding:28px}.startPanel h2{font-size:44px;margin-bottom:12px}.startPanel p{color:var(--muted);font-size:16px;margin-bottom:20px}.joinBox{display:grid;gap:12px;max-width:520px}.joinedNote{background:#eaf7f1;color:#12623d;border:1px solid #8ed7b5;border-radius:8px;padding:10px;font-weight:800}.proposalCard{border-left:5px solid var(--gold)}.proposalGroups{display:grid;gap:8px;margin:8px 0}.proposalGroup{background:#f8fafc;border:1px solid #e3eaf1;border-radius:8px;padding:8px}.proposalGroup ul{margin:6px 0 0;padding-left:18px}.voteBar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:8px}.voteCount{background:#eaf1ff;color:#1849a9;border-radius:999px;padding:5px 9px;font-size:12px;font-weight:900}.testTools{margin-top:12px;background:#f8fafc;border:1px dashed #b8c4d4;border-radius:8px;padding:10px}.testTools summary{cursor:pointer;font-weight:900}.testTools .row{margin-top:8px}.candidateCard{display:grid;gap:8px}.confirmedBox{border:1px solid #8ed7b5;background:#eaf7f1;color:#12623d;border-radius:8px;padding:10px;font-weight:800;margin-bottom:12px}.detailForm{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.draftBox{background:#fffdfa;border:1px solid #f2c16b;border-radius:8px;padding:12px;margin-top:12px}.readOnlyNote{background:#f2f6fa;border:1px solid #d8e1ec;color:#475467;border-radius:8px;padding:8px;font-size:13px}