:root{
  --bg:#f5f7fb; --card:#ffffff; --line:#e5e8f0; --ink:#0f172a; --muted:#64748b;
  --brand:#2f5cff; --brand-dark:#1f43cc; --brand-soft:#eaefff; --ok:#12a150; --danger:#e5484d;
  --shadow:0 10px 30px rgba(16,24,40,.08);
  --radius:16px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:Inter,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  background:var(--bg); color:var(--ink); font-size:15px; line-height:1.5;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--brand);text-decoration:none}
button{font-family:inherit}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border:1px solid transparent;border-radius:12px;padding:11px 18px;font-weight:600;font-size:14px;
  cursor:pointer;transition:.15s;background:var(--brand);color:#fff;
}
.btn:hover{background:var(--brand-dark)}
.btn.ghost{background:#fff;border-color:var(--line);color:var(--ink)}
.btn.ghost:hover{background:#f8fafc}
.btn.subtle{background:var(--brand-soft);color:var(--brand)}
.btn.danger{background:#fff;border-color:#f3c9ca;color:var(--danger)}
.btn.sm{padding:7px 12px;font-size:13px;border-radius:10px}
.btn:disabled{opacity:.55;cursor:not-allowed}
.input,select{
  width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:#fff;
  font-size:14px;color:var(--ink);outline:none;transition:.15s;
}
.input:focus,select:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(47,92,255,.12)}
label.field{display:block;margin-bottom:14px}
label.field span{display:block;font-size:13px;font-weight:600;color:#334155;margin-bottom:6px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.muted{color:var(--muted)}
.small{font-size:13px}
.hidden{display:none !important}

/* ---------- brand ---------- */
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px;letter-spacing:-.3px;color:var(--ink)}
.brand .mark{
  width:32px;height:32px;border-radius:10px;display:grid;place-items:center;
  background:linear-gradient(135deg,#2f5cff,#6b8bff);color:#fff;font-size:15px;font-weight:800;
  box-shadow:0 6px 14px rgba(47,92,255,.28);
}

/* ---------- landing ---------- */
.topbar{padding:22px 28px;display:flex;align-items:center;justify-content:space-between;max-width:1180px;margin:0 auto}
.landing{max-width:1180px;margin:0 auto;padding:20px 28px 70px;display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center}
.landing h1{font-size:46px;line-height:1.08;letter-spacing:-1.5px;margin:0 0 18px}
.landing h1 em{font-style:normal;color:var(--brand)}
.landing p.lead{font-size:16px;color:var(--muted);max-width:520px;margin:0 0 26px}
.feats{display:grid;grid-template-columns:1fr 1fr;gap:12px;max-width:520px}
.feat{display:flex;gap:10px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px 14px;font-size:13px}
.feat b{display:block;font-size:13px}
.feat i{width:22px;height:22px;border-radius:7px;background:var(--brand-soft);color:var(--brand);display:grid;place-items:center;font-style:normal;font-size:12px;flex:none}
.auth{padding:26px}
.auth h2{margin:0 0 4px;font-size:21px;letter-spacing:-.4px}
.auth .tabs{display:flex;gap:6px;background:#f1f4fa;padding:4px;border-radius:12px;margin:18px 0 20px}
.auth .tabs button{flex:1;border:0;background:transparent;padding:9px;border-radius:9px;font-weight:600;font-size:13px;color:var(--muted);cursor:pointer}
.auth .tabs button.on{background:#fff;color:var(--ink);box-shadow:0 2px 6px rgba(16,24,40,.08)}
.err{background:#fdecec;color:#b42318;border:1px solid #f5c2c2;border-radius:10px;padding:9px 12px;font-size:13px;margin-bottom:12px}
.note{font-size:12px;color:var(--muted);margin-top:14px;text-align:center}

/* ---------- dashboard ---------- */
.shell{max-width:1120px;margin:0 auto;padding:22px 24px 60px}
.head{display:flex;align-items:center;justify-content:space-between;gap:16px;margin:10px 0 24px}
.head h1{font-size:26px;margin:0;letter-spacing:-.6px}
.statrow{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-bottom:26px}
.stat{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px 18px}
.stat b{display:block;font-size:24px;letter-spacing:-.6px}
.stat span{font-size:12px;color:var(--muted)}
.list{display:grid;gap:12px}
.room-row{display:flex;align-items:center;gap:16px;padding:16px 18px}
.room-row .ico{width:44px;height:44px;border-radius:12px;background:var(--brand-soft);color:var(--brand);display:grid;place-items:center;font-size:19px;flex:none}
.room-row .meta{flex:1;min-width:0}
.room-row .meta b{display:block;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.room-row .meta span{font-size:12.5px;color:var(--muted)}
.room-row .acts{display:flex;gap:8px;flex:none}
.empty{padding:54px 20px;text-align:center;color:var(--muted)}
.empty .big{font-size:40px;margin-bottom:10px}

/* modal */
.overlay{position:fixed;inset:0;background:rgba(15,23,42,.45);display:grid;place-items:center;padding:18px;z-index:60}
.modal{width:100%;max-width:440px;padding:24px}
.modal h3{margin:0 0 16px;font-size:19px;letter-spacing:-.3px}
.modal .row{display:flex;gap:10px;justify-content:flex-end;margin-top:18px}

/* toast */
#toast{position:fixed;left:50%;bottom:96px;transform:translateX(-50%) translateY(20px);background:#0f172a;color:#fff;
  padding:11px 18px;border-radius:12px;font-size:13px;opacity:0;pointer-events:none;transition:.22s;z-index:99}
#toast.on{opacity:1;transform:translateX(-50%) translateY(0)}

/* ---------- room ---------- */
.room-body{background:#0d1220;color:#fff;height:100dvh;overflow:hidden;display:flex;flex-direction:column}
.room-top{height:58px;display:flex;align-items:center;justify-content:space-between;padding:0 18px;border-bottom:1px solid rgba(255,255,255,.08);flex:none}
.room-top .t{font-weight:600;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:52vw}
.room-top .info{display:flex;align-items:center;gap:14px;font-size:12.5px;color:#9aa7bd}
.pill{background:rgba(255,255,255,.09);border-radius:999px;padding:5px 11px;font-size:12px}
.rec-dot{width:7px;height:7px;border-radius:50%;background:#e5484d;display:inline-block;margin-right:6px}
.mid{flex:1;display:flex;min-height:0;min-width:0}
.stage{flex:1;display:flex;min-height:0;min-width:0}
.grid-wrap{flex:1;padding:16px;display:flex;align-items:center;justify-content:center;min-width:0}
.grid{display:grid;gap:12px;width:100%;height:100%;grid-auto-rows:auto;align-content:center;place-items:center}
.tile{position:relative;border-radius:14px;overflow:hidden;background:#161d2e;display:flex;align-items:center;justify-content:center;min-height:80px;width:100%;aspect-ratio:16/9;max-height:100%}
.tile video{width:100%;height:100%;object-fit:cover;background:#000;display:block}
.tile.audio-only video{display:none}
.tile .avas{position:absolute;inset:0;display:grid;place-items:center;font-size:30px;font-weight:700;background:#1b2336;color:#c8d2e8}
.tile:not(.audio-only) .avas{display:none}
.tile .nametag{position:absolute;left:10px;bottom:10px;background:rgba(0,0,0,.55);backdrop-filter:blur(4px);
  padding:4px 10px;border-radius:8px;font-size:12px;display:flex;align-items:center;gap:6px;max-width:calc(100% - 20px)}
.tile .nametag span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.tile .mic-off{color:#ff8a8f;font-size:12px}
.tile.speaking{outline:2px solid #4ade80;outline-offset:-2px}
.pres{display:none;flex:none;height:0}
.room-body.presenting .stage{flex-direction:column}
.room-body.presenting .pres{display:block;height:auto;flex:1;min-height:0;padding:12px 16px 0}
.pres video{width:100%;height:100%;object-fit:contain;background:#000;border-radius:12px}
.room-body.presenting .grid-wrap{flex:none;height:132px;padding:10px 16px}
.room-body.presenting .grid{grid-auto-flow:column;grid-auto-columns:minmax(110px,150px);grid-template-columns:none;overflow-x:auto;height:100%}

.bar{flex:none;display:flex;align-items:center;justify-content:center;gap:10px;padding:14px;background:#0b101c;border-top:1px solid rgba(255,255,255,.07)}
.cbtn{width:48px;height:48px;border-radius:50%;border:0;background:#1d2639;color:#fff;display:grid;place-items:center;cursor:pointer;transition:.15s;font-size:18px}
.cbtn:hover{background:#27324a}
.cbtn.off{background:#e5484d}
.cbtn.on{background:#2f5cff}
.cbtn.leave{background:#e5484d;width:auto;border-radius:24px;padding:0 20px;font-weight:600;font-size:14px;gap:8px;display:flex}
.cbtn svg{width:21px;height:21px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.cbtn .ico-off{display:none}
.cbtn.off .ico-on{display:none}
.cbtn.off .ico-off{display:block}
.cbtn .lbl{font-size:11px;position:absolute;margin-top:56px;color:#9aa7bd}

.side{width:340px;flex:none;background:#111827;border-left:1px solid rgba(255,255,255,.08);display:flex;flex-direction:column}
.side h4{margin:0;padding:15px 16px;font-size:13px;letter-spacing:.4px;text-transform:uppercase;color:#9aa7bd;border-bottom:1px solid rgba(255,255,255,.07)}
.side .body{flex:1;overflow-y:auto;padding:12px 14px}
.msg{margin-bottom:12px}
.msg b{font-size:12.5px;color:#c8d2e8;display:block;margin-bottom:2px}
.msg p{margin:0;font-size:13.5px;background:#1d2639;padding:8px 11px;border-radius:10px;display:inline-block;max-width:100%;word-break:break-word}
.msg.me p{background:#2f5cff}
.msg.me b{text-align:right}
.msg.me{text-align:right}
.chat-in{display:flex;gap:8px;padding:10px;border-top:1px solid rgba(255,255,255,.07);flex:none}
.chat-in input{background:#1d2639;border:1px solid rgba(255,255,255,.1);color:#fff;border-radius:10px;padding:10px 12px;flex:1;outline:none;font-size:13.5px}
.chat-in button{border:0;border-radius:10px;background:#2f5cff;color:#fff;padding:0 14px;cursor:pointer}
.plist{display:flex;align-items:center;gap:10px;padding:9px 6px;border-radius:9px}
.plist:hover{background:rgba(255,255,255,.05)}
.plist .av{width:32px;height:32px;border-radius:50%;background:#2f5cff;display:grid;place-items:center;font-size:13px;font-weight:700;flex:none}
.plist .nm{flex:1;font-size:13.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.plist .st{font-size:11px;color:#9aa7bd}
.plist .host{font-size:10px;background:rgba(47,92,255,.2);color:#9fb3ff;padding:2px 7px;border-radius:6px}

/* prejoin */
.prejoin{height:100dvh;display:grid;place-items:center;padding:20px;background:var(--bg)}
.prejoin .card{width:100%;max-width:520px;padding:28px;text-align:center}
.prejoin h2{margin:6px 0 6px;font-size:23px;letter-spacing:-.5px;color:var(--ink)}
.prejoin .sub{color:var(--muted);font-size:13.5px;margin-bottom:20px}
.preview{position:relative;border-radius:14px;overflow:hidden;background:#0d1220;aspect-ratio:16/10;margin-bottom:18px;display:grid;place-items:center}
.preview video{width:100%;height:100%;object-fit:cover;transform:rotateY(180deg);display:none}
.preview.live video{display:block}
.preview .ph{color:#7c89a3;font-size:13px}
.prejoin .ctrls{display:flex;gap:10px;justify-content:center;margin-bottom:18px}
.prejoin .join{width:100%;padding:14px;font-size:15px}
.waiting{color:var(--muted);font-size:13px;margin-top:12px}

@media (max-width:860px){
  .landing{grid-template-columns:1fr;gap:28px;padding:10px 18px 50px}
  .landing h1{font-size:34px}
  .feats{grid-template-columns:1fr}
  .topbar{padding:16px 18px}
  .shell{padding:16px 16px 50px}
  .head h1{font-size:21px}
  .statrow{grid-template-columns:1fr 1fr 1fr;gap:8px}
  .stat{padding:12px}
  .stat b{font-size:19px}
  .room-row{flex-wrap:wrap}
  .room-row .acts{width:100%;justify-content:flex-end}
  .side{position:fixed;inset:58px 0 78px 0;width:100%;z-index:40}
  .room-top .t{max-width:40vw}
  .bar{gap:6px;padding:10px}
  .cbtn{width:44px;height:44px;font-size:16px}
  .cbtn.leave{padding:0 14px}
}

@media (max-width:520px){
  .room-top{padding:0 10px}
  .room-top .info{gap:8px}
  .room-top .info .pill:first-child{display:none}
  #btnInvite{padding:7px 10px;font-size:12.5px}
  .room-top .t{max-width:46vw;font-size:13px}
  .prejoin .card{padding:22px}
  .prejoin h2{font-size:20px}
}

.plist .mini{border:0;background:rgba(229,72,77,.16);color:#ff9ea2;font-size:11px;padding:4px 8px;border-radius:7px;cursor:pointer;flex:none}
.plist .mini:hover{background:rgba(229,72,77,.28)}
#muteAll{background:var(--brand);color:#fff}