:root{
  --bg:#0b1020;--panel:#141a2e;--panel2:#1c2340;--line:#2a3358;--text:#e8ecf8;--muted:#8e98bb;
  --brand:#6366f1;--brand2:#06b6d4;--danger:#ef4444;--ok:#10b981;--warn:#f59e0b;
  --radius:14px;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{font-family:"Noto Sans TC","Microsoft JhengHei","PingFang TC",system-ui,sans-serif;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}
button,input,select,textarea{font:inherit;color:inherit}
a{color:var(--brand2)}
a.btn{text-decoration:none;color:var(--text)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:10px;padding:11px 18px;cursor:pointer;background:var(--panel2);color:var(--text);font-weight:600;transition:.15s}
.btn:hover{filter:brightness(1.15)}
.btn.primary{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff}
.btn.danger{background:var(--danger);color:#fff}
.btn.ghost{background:transparent;border:1px solid var(--line)}
.btn.sm{padding:6px 10px;font-size:13px;border-radius:8px}
.input{width:100%;background:#0f1530;border:1px solid var(--line);border-radius:10px;padding:12px 14px;outline:none}
.input:focus{border-color:var(--brand)}
label.lbl{display:block;font-size:13px;color:var(--muted);margin:14px 0 6px}
.hidden{display:none!important}

/* ===== Home ===== */
.home{min-height:100%;display:flex;flex-direction:column;background:radial-gradient(1200px 600px at 80% -10%,#3730a3 0%,transparent 60%),radial-gradient(900px 500px at -10% 110%,#0e7490 0%,transparent 55%),var(--bg)}
.topbar{display:flex;align-items:center;justify-content:space-between;padding:18px 28px}
.logo{display:flex;align-items:center;gap:10px;font-weight:900;font-size:20px;letter-spacing:.5px}
.logo i{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--brand),var(--brand2));display:inline-flex;align-items:center;justify-content:center;font-style:normal;font-size:18px}
.hero{flex:1;display:grid;grid-template-columns:1.1fr 1fr;gap:40px;align-items:center;max-width:1180px;margin:0 auto;padding:20px 28px 40px;width:100%}
.hero h1{font-size:44px;line-height:1.2;font-weight:900}
.hero h1 span{background:linear-gradient(90deg,#a5b4fc,#67e8f9);-webkit-background-clip:text;color:transparent}
.hero p.desc{color:#c3cae6;margin:16px 0 26px;font-size:17px;line-height:1.7}
.feat{display:flex;flex-wrap:wrap;gap:8px}
.feat span{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.1);padding:6px 12px;border-radius:20px;font-size:13px}
.box{background:rgba(20,26,46,.85);backdrop-filter:blur(10px);border:1px solid var(--line);border-radius:20px;padding:26px}
.tabs{display:flex;background:#0f1530;border-radius:12px;padding:4px;margin-bottom:6px}
.tabs button{flex:1;border:0;background:transparent;padding:10px;border-radius:9px;cursor:pointer;color:var(--muted);font-weight:700}
.tabs button.on{background:var(--panel2);color:#fff}
.row{display:flex;gap:10px;align-items:center}
.check{display:flex;align-items:center;gap:8px;margin-top:12px;font-size:14px;color:#c3cae6;cursor:pointer}
.msg{margin-top:12px;font-size:14px;color:#fca5a5;min-height:20px}
.foot{text-align:center;color:var(--muted);font-size:13px;padding:16px}
.result{background:#0f1530;border:1px dashed var(--brand);border-radius:12px;padding:14px;margin-top:14px;font-size:14px;line-height:1.8}
.result b{font-size:20px;letter-spacing:2px;color:#a5b4fc}

/* ===== Prejoin ===== */
.prejoin{max-width:980px;margin:40px auto;display:grid;grid-template-columns:1.3fr 1fr;gap:28px;padding:0 20px}
.preview{position:relative;aspect-ratio:16/9;background:#000;border-radius:var(--radius);overflow:hidden}
.preview video{width:100%;height:100%;object-fit:cover;transform:scaleX(-1)}
.preview .ctrls{position:absolute;bottom:14px;left:0;right:0;display:flex;justify-content:center;gap:12px}

/* ===== Room ===== */
.room{height:100%;display:flex;flex-direction:column;overflow:hidden}
.room-top{height:52px;display:flex;align-items:center;justify-content:space-between;padding:0 16px;background:var(--panel);border-bottom:1px solid var(--line);flex-shrink:0}
.room-top .info{display:flex;align-items:center;gap:12px;font-size:14px;min-width:0}
.room-top .title{font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.pill{font-size:12px;padding:3px 9px;border-radius:20px;background:var(--panel2);color:var(--muted);white-space:nowrap}
.pill.rec{background:var(--danger);color:#fff;animation:blink 1.5s infinite}
.pill.lock{background:#78350f;color:#fde68a}
@keyframes blink{50%{opacity:.6}}
.room-main{flex:1;display:flex;min-height:0}
.stage{flex:1;position:relative;padding:12px;min-width:0;display:flex}
.grid{flex:1;display:grid;gap:10px;align-content:center;justify-content:center}
.tile{position:relative;background:#111735;border-radius:var(--radius);overflow:hidden;aspect-ratio:16/9;border:2px solid transparent;transition:border-color .2s}
.tile.speaking{border-color:var(--ok);box-shadow:0 0 0 2px rgba(16,185,129,.25)}
.tile video{width:100%;height:100%;object-fit:cover;background:#000}
.tile.self video.mirror{transform:scaleX(-1)}
.tile.screen video{object-fit:contain}
.tile .avatar{position:absolute;inset:0;display:flex;align-items:center;justify-content:center}
.tile .avatar span{width:84px;height:84px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:34px;font-weight:800;color:#fff}
.tile .nm{position:absolute;left:8px;bottom:8px;background:rgba(0,0,0,.6);padding:4px 10px;border-radius:8px;font-size:13px;display:flex;align-items:center;gap:6px;max-width:calc(100% - 16px)}
.tile .nm em{font-style:normal;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tile .badges{position:absolute;top:8px;right:8px;display:flex;gap:6px}
.tile .badges span{background:rgba(0,0,0,.6);border-radius:8px;padding:3px 7px;font-size:13px}
.tile .pin{position:absolute;top:8px;left:8px;opacity:0;transition:.2s}
.tile:hover .pin{opacity:1}
.stage.spotlight .grid{grid-template-columns:1fr!important}
.stage.spotlight .tile:not(.pinned){display:none}
.captions{position:absolute;left:50%;bottom:20px;transform:translateX(-50%);max-width:80%;display:flex;flex-direction:column;gap:6px;align-items:center;pointer-events:none;z-index:5}
.captions div{background:rgba(0,0,0,.75);padding:6px 14px;border-radius:8px;font-size:17px;line-height:1.5}
.captions b{color:#67e8f9;margin-right:6px}
.reactions{position:absolute;left:30px;bottom:30px;pointer-events:none;z-index:6}
.reactions .r{position:absolute;bottom:0;font-size:38px;animation:floatUp 3s ease-out forwards;white-space:nowrap}
.reactions .r small{font-size:12px;display:block;text-align:center;background:rgba(0,0,0,.6);border-radius:6px;padding:0 4px}
@keyframes floatUp{0%{transform:translateY(0);opacity:1}100%{transform:translateY(-320px);opacity:0}}

.side{width:340px;background:var(--panel);border-left:1px solid var(--line);display:flex;flex-direction:column;flex-shrink:0}
.side-head{display:flex;align-items:center;justify-content:space-between;padding:12px 14px;border-bottom:1px solid var(--line);font-weight:700}
.side-body{flex:1;overflow:auto;padding:10px 12px}
.plist .p{display:flex;align-items:center;gap:10px;padding:8px 6px;border-radius:10px}
.plist .p:hover{background:var(--panel2)}
.plist .p .av{width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:14px;flex-shrink:0;color:#fff}
.plist .p .n{flex:1;font-size:14px;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.plist .p .n small{color:var(--muted);margin-left:4px}
.plist .p .ic{font-size:14px;opacity:.85}
.menu{position:relative}
.menu .dd{position:absolute;right:0;top:100%;background:var(--panel2);border:1px solid var(--line);border-radius:10px;min-width:150px;z-index:20;overflow:hidden;box-shadow:0 10px 30px rgba(0,0,0,.4)}
.menu .dd button{display:block;width:100%;text-align:left;border:0;background:none;padding:9px 14px;cursor:pointer;font-size:14px}
.menu .dd button:hover{background:var(--line)}
.waitbox{background:#1e1b4b;border:1px solid #4338ca;border-radius:10px;padding:10px;margin-bottom:10px}
.waitbox .w{display:flex;align-items:center;justify-content:space-between;padding:5px 0;font-size:14px;gap:6px}
.sec-title{font-size:12px;color:var(--muted);margin:10px 4px 6px;text-transform:uppercase;letter-spacing:1px}
.chat-list{display:flex;flex-direction:column;gap:10px}
.chat-list .m{font-size:14px;line-height:1.55}
.chat-list .m .h{font-size:12px;color:var(--muted);margin-bottom:2px}
.chat-list .m .h b{color:#a5b4fc;font-weight:700}
.chat-list .m .t{background:var(--panel2);display:inline-block;padding:7px 11px;border-radius:10px;word-break:break-word;white-space:pre-wrap}
.chat-list .m.mine{align-items:flex-end;text-align:right}
.chat-list .m.mine .t{background:#312e81}
.chat-list .m.pm .t{background:#4a1d4f}
.chat-foot{padding:10px;border-top:1px solid var(--line)}
.chat-foot select{background:#0f1530;border:1px solid var(--line);border-radius:8px;padding:5px;font-size:13px;margin-bottom:6px;width:100%}
.chat-foot textarea{resize:none;height:60px}
.summary{white-space:pre-wrap;font-size:14px;line-height:1.75;background:#0f1530;border-radius:10px;padding:12px;margin-top:10px}

.toolbar{height:76px;background:var(--panel);border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 16px;flex-shrink:0;gap:10px}
.tb-group{display:flex;gap:6px;align-items:center}
.tb{display:flex;flex-direction:column;align-items:center;gap:3px;border:0;background:transparent;cursor:pointer;padding:6px 10px;border-radius:10px;min-width:62px;font-size:12px;color:#cbd2ee;position:relative}
.tb:hover{background:var(--panel2)}
.tb .i{font-size:21px;line-height:1}
.tb.off .i{filter:grayscale(1) opacity(.6)}
.tb.off{color:#fca5a5}
.tb.on{background:#312e81;color:#fff}
.tb .cnt{position:absolute;top:2px;right:8px;background:var(--danger);color:#fff;border-radius:10px;font-size:10px;padding:0 5px;min-width:16px}
.pop{position:absolute;bottom:80px;background:var(--panel2);border:1px solid var(--line);border-radius:14px;padding:8px;display:flex;gap:4px;z-index:30;box-shadow:0 10px 30px rgba(0,0,0,.4)}
.pop button{border:0;background:none;font-size:26px;cursor:pointer;padding:4px 6px;border-radius:8px}
.pop button:hover{background:var(--line)}

/* whiteboard */
.wb{position:absolute;inset:12px;background:#fff;border-radius:var(--radius);z-index:8;display:flex;flex-direction:column;overflow:hidden}
.wb-tools{display:flex;gap:8px;align-items:center;padding:8px 12px;background:#f1f5f9;color:#0f172a;flex-wrap:wrap}
.wb-tools .c{width:24px;height:24px;border-radius:50%;border:2px solid #fff;cursor:pointer;box-shadow:0 0 0 1px #cbd5e1}
.wb-tools .c.on{box-shadow:0 0 0 3px #6366f1}
.wb-tools .btn{background:#e2e8f0;color:#0f172a}
.wb canvas{flex:1;width:100%;touch-action:none;cursor:crosshair}

/* modal */
.modal{position:fixed;inset:0;background:rgba(0,0,0,.6);display:flex;align-items:center;justify-content:center;z-index:100;padding:20px}
.modal .box{width:100%;max-width:440px}
.modal h3{margin-bottom:6px}
.toast{position:fixed;top:64px;left:50%;transform:translateX(-50%);background:var(--panel2);border:1px solid var(--line);padding:10px 18px;border-radius:10px;z-index:200;font-size:14px;box-shadow:0 10px 30px rgba(0,0,0,.4);transition:opacity .3s}

.center-screen{height:100%;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:16px;text-align:center;padding:20px}
.spinner{width:42px;height:42px;border:4px solid var(--line);border-top-color:var(--brand2);border-radius:50%;animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* admin */
.admin{max-width:1100px;margin:30px auto;padding:0 20px}
.admin table{width:100%;border-collapse:collapse;margin-top:16px;font-size:14px}
.admin th,.admin td{text-align:left;padding:10px;border-bottom:1px solid var(--line);vertical-align:top}
.admin th{color:var(--muted);font-weight:600}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:16px}
.stats div{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:18px}
.stats b{font-size:30px;display:block;background:linear-gradient(90deg,#a5b4fc,#67e8f9);-webkit-background-clip:text;color:transparent}

.tb.more{display:none}
.btn.danger{white-space:nowrap}
@media (max-width:900px){
  .hero{grid-template-columns:1fr;padding-top:10px}.hero h1{font-size:32px}
  .topbar{padding:14px 16px}
  .prejoin{grid-template-columns:1fr;margin:16px auto;gap:16px}
  .side{position:fixed;right:0;top:52px;bottom:68px;width:100%;max-width:420px;z-index:40;box-shadow:-10px 0 30px rgba(0,0,0,.4)}
  .toolbar{height:68px;padding:0 8px;gap:4px}
  .tb{min-width:50px;padding:6px 6px}.tb .lb{display:none}.tb .i{font-size:23px}
  .tb.x{display:none}.tb.more{display:flex}
  .room-top{padding:0 10px}.room-top .hide-m{display:none}
  .stage{padding:6px}.grid{gap:6px}
  .captions{max-width:94%;bottom:10px}.captions div{font-size:15px}
  body.more-open #tbMid{position:fixed;left:8px;right:8px;bottom:76px;display:grid;grid-template-columns:repeat(4,1fr);gap:6px;background:var(--panel2);border:1px solid var(--line);border-radius:16px;padding:10px;z-index:60;box-shadow:0 -10px 30px rgba(0,0,0,.45)}
  body.more-open #tbMid .tb{display:flex;min-width:0;padding:10px 4px}
  body.more-open #tbMid .tb .lb{display:block;font-size:12px}
  body.more-open #tMore{background:#312e81;color:#fff}
  .pop{bottom:150px;left:8px!important;right:8px;justify-content:center;flex-wrap:wrap}
  .wb{inset:6px}.wb-tools{gap:6px;padding:6px 8px}.wb-tools b{display:none}
  .modal .box{padding:20px}
  .stats{gap:8px}.stats div{padding:12px}.stats b{font-size:24px}
  .admin table thead{display:none}
  .admin table,.admin tbody,.admin tr,.admin td{display:block;width:100%}
  .admin tr{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:6px 12px;margin-bottom:12px}
  .admin td{border:0;padding:6px 0;display:flex;gap:10px}
  .admin td::before{content:attr(data-label);color:var(--muted);min-width:72px;flex-shrink:0;font-size:13px}
  .admin .row{flex-wrap:wrap}
}
@media (max-width:420px){
  .hero h1{font-size:28px}.box{padding:20px}
  .room-top .title{max-width:120px}
}