:root{--m-brand: #1677ff;--m-brand-hover: #4096ff;--m-brand-soft: #e6f4ff;--m-ink: #0f172a;--m-ink-2: #334155;--m-text: #1f1f1f;--m-text-2: #595959;--m-text-3: #8c8c8c;--m-border: #e8e8e8;--m-border-strong: #d9d9d9;--m-bg: #f5f5f5;--m-card: #ffffff;--m-danger: #ff4d4f;--m-danger-soft: #fff2f0;--m-warn: #fa8c16;--m-warn-soft: #fff7e6;--m-success: #52c41a;--m-radius: 6px;--m-radius-lg: 8px;--m-shadow: 0 1px 2px rgba(0, 0, 0, .03), 0 1px 6px rgba(0, 0, 0, .04);--m-font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;--m-font-display: "Outfit", "Noto Sans SC", sans-serif;color:var(--m-text);background:var(--m-bg);font-family:var(--m-font);font-size:14px;line-height:1.5715;-webkit-font-smoothing:antialiased}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:var(--m-bg)}#app{min-height:100vh}button,input,select,textarea{font:inherit;color:inherit}button{cursor:pointer;border:1px solid transparent;border-radius:var(--m-radius);padding:7px 15px;background:var(--m-brand);color:#fff;transition:background .15s ease,border-color .15s ease}button:hover:not(:disabled){background:var(--m-brand-hover)}button.secondary{background:#fff;color:var(--m-text);border-color:var(--m-border-strong)}button.secondary:hover:not(:disabled){color:var(--m-brand);border-color:var(--m-brand);background:#fff}button.danger{background:var(--m-danger);border-color:var(--m-danger)}button.danger:hover:not(:disabled){background:#ff7875;border-color:#ff7875}button:disabled{opacity:.45;cursor:not-allowed}button.mini{padding:2px 8px;font-size:12px;border-radius:4px;margin-left:4px;line-height:1.6}button.mini.secondary{background:#fff;color:var(--m-text-2);border-color:var(--m-border-strong)}button.mini.danger{background:#fff;color:var(--m-danger);border-color:#ffccc7}input,select{width:100%;padding:7px 11px;border:1px solid var(--m-border-strong);border-radius:var(--m-radius);background:#fff;outline:none;transition:border-color .15s ease,box-shadow .15s ease}input:focus,select:focus{border-color:var(--m-brand);box-shadow:0 0 0 2px #1677ff1f}input::placeholder{color:var(--m-text-3)}a{color:var(--m-brand);text-decoration:none}a:hover{color:var(--m-brand-hover)}.page-wrap{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:32px 16px 48px;position:relative;background:radial-gradient(900px 420px at 8% -8%,rgba(22,119,255,.14),transparent 55%),radial-gradient(720px 380px at 96% 4%,rgba(15,23,42,.06),transparent 50%),linear-gradient(180deg,#f8fafc 0%,var(--m-bg) 52%,#eef2f7 100%)}.page-wrap:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;background-image:radial-gradient(rgba(15,23,42,.035) 1px,transparent 1px);background-size:18px 18px;opacity:.7}.page-wrap>*{position:relative;z-index:1}.brand-mark{display:flex;align-items:center;gap:10px;margin-bottom:20px;-webkit-user-select:none;user-select:none;flex-wrap:wrap}.brand-mark.stacked{flex-direction:column;align-items:flex-start;gap:6px}.brand-logo-wrap{display:inline-flex;align-items:center;justify-content:center;border-radius:10px;max-width:100%}.brand-mark.tone-light .brand-logo-wrap{background:#0b1220;padding:8px 12px;box-shadow:0 8px 20px #0f172a2e}.brand-mark.tone-dark .brand-logo-wrap{background:transparent;padding:0}.brand-logo{display:block;width:auto;height:28px;max-width:min(200px,72vw);object-fit:contain}.brand-mark.size-sm .brand-logo{height:22px;max-width:min(150px,60vw)}.brand-mark.size-sm.tone-light .brand-logo-wrap{padding:6px 10px;border-radius:8px}.brand-mark.size-lg .brand-logo{height:34px;max-width:min(240px,80vw)}.brand-sub{font-size:12px;color:var(--m-text-3);font-weight:400;line-height:1.3}.brand-mark.tone-dark .brand-sub{color:#94a3b8}.room-brand-logo{display:block;height:22px;width:auto;max-width:min(148px,42vw);object-fit:contain}@media(max-width:560px){.brand-logo{height:22px;max-width:min(160px,68vw)}.brand-mark.size-lg .brand-logo{height:26px}.brand-mark.tone-light .brand-logo-wrap{padding:6px 10px}.room-brand-logo{height:18px;max-width:min(120px,38vw)}}.card{width:100%;max-width:420px;background:var(--m-card);border:1px solid var(--m-border);border-radius:var(--m-radius-lg);padding:28px 28px 24px;box-shadow:var(--m-shadow)}.card h2{margin:0 0 6px;font-size:18px;font-weight:600;color:var(--m-text)}.card .lead{margin:0 0 20px;color:var(--m-text-2);font-size:13px;line-height:1.6}.card .lead.resume-tip{color:var(--m-brand);font-weight:500}.row{margin-bottom:16px}.label{display:block;margin-bottom:6px;color:var(--m-text-2);font-size:13px}.actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px;align-items:center}.hint{color:var(--m-text-3);font-size:12px;line-height:1.6;margin:0}.err{color:var(--m-danger);font-size:13px;margin:8px 0 0}.passbox{background:#fafafa;border:1px solid var(--m-border);border-radius:var(--m-radius);padding:12px 14px;font-size:13px;line-height:1.8}.passbox .row-line{display:flex;align-items:flex-start;gap:8px;flex-wrap:wrap}.passbox .k{color:var(--m-text-3);min-width:4.5em}.passbox code{font-family:Consolas,SF Mono,Courier New,monospace;font-weight:600;color:var(--m-text);font-size:13px}.passbox .break{word-break:break-all;font-weight:500}.qr-wrap{margin-top:14px;text-align:center;padding-top:12px;border-top:1px solid var(--m-border)}.qr-wrap img{border:1px solid var(--m-border);border-radius:4px;padding:6px;background:#fff}.footer-link{margin-top:18px;text-align:center;font-size:12px;color:var(--m-text-3)}.footer-link a{margin-left:4px}.check-line{display:flex;align-items:center;gap:8px;color:var(--m-text-2);font-size:13px;cursor:pointer;-webkit-user-select:none;user-select:none}.check-line input{width:auto;margin:0;accent-color:var(--m-brand)}.room-shell{--room-bar: #0b1220;--room-panel: #111827;--room-line: rgba(148, 163, 184, .18);--room-chip: rgba(255, 255, 255, .06);position:relative;display:flex;flex-direction:column;height:100dvh;min-height:100vh;overflow:hidden;background:radial-gradient(1200px 480px at 12% -10%,rgba(22,119,255,.18),transparent 55%),radial-gradient(900px 420px at 90% 0%,rgba(15,23,42,.55),transparent 50%),linear-gradient(180deg,#0b1220,#111827 42%,#0f172a);color:#e2e8f0;animation:room-in .35s ease-out}@keyframes room-in{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}.room-bar{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding:10px 16px;padding-top:calc(10px + env(safe-area-inset-top,0px));padding-left:calc(16px + env(safe-area-inset-left,0px));padding-right:calc(16px + env(safe-area-inset-right,0px));border-bottom:1px solid var(--room-line);background:#0b1220e0;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);z-index:5}.room-logo{display:none}.room-bar-brand{display:flex;align-items:center;gap:10px;min-width:0}.room-bar-titles{display:flex;flex-direction:column;min-width:0;line-height:1.25}.room-product{font-family:var(--m-font-display);font-size:15px;font-weight:650;letter-spacing:.04em;color:#fff}.room-meta{font-size:12px;color:#94a3b8}.room-bar-status{display:flex;flex-wrap:wrap;gap:6px;flex:1;min-width:0}.chip{display:inline-flex;align-items:center;padding:3px 9px;border-radius:6px;font-size:12px;color:#cbd5e1;background:var(--room-chip);border:1px solid var(--room-line);white-space:nowrap}.chip-live{color:#93c5fd;border-color:#3b82f659;background:#2563eb26}.chip-ok{color:#86efac;border-color:#22c55e59;background:#16a34a24}.chip-listen{color:#fdba74;border-color:#f9731659;background:#ea580c24}.chip-rec{color:#fda4af;border-color:#f43f5e66;background:#e11d4829;animation:rec-pulse 1.6s ease-in-out infinite}.chip-warn{color:#fde68a;border-color:#facc1573;background:#ca8a0433}.chip-pulse{animation:rec-pulse 1.2s ease-in-out infinite}@keyframes rec-pulse{0%,to{opacity:1}50%{opacity:.72}}.rail-toggle{margin-left:auto;background:transparent!important;color:#e2e8f0!important;border-color:var(--room-line)!important}.rail-toggle:hover:not(:disabled){border-color:#60a5fa8c!important;color:#fff!important;background:#ffffff0a!important}.room-body{flex:1;min-height:0;display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:0}.stage-col{min-width:0;min-height:0;display:flex;flex-direction:column;padding:12px 12px 10px;overflow-x:hidden;overflow-y:auto;-webkit-overflow-scrolling:touch}.stage-frame{position:relative;flex:1 1 auto;min-height:220px;border-radius:12px;overflow:hidden;border:1px solid var(--room-line);background:linear-gradient(180deg,#0f172a59,#020617d9),#020617;box-shadow:inset 0 1px #ffffff0a}.stage{position:relative;z-index:1;height:100%;min-height:220px;display:flex;flex-direction:column;flex-wrap:nowrap;gap:8px;padding:10px;align-items:stretch;overflow-y:auto}.stage video{width:100%;height:auto;min-height:120px;max-height:160px;object-fit:cover;background:#000;border-radius:8px;border:1px solid rgba(148,163,184,.16);align-self:center;max-width:min(100%,320px)}.stage:not(.layout-gallery) video:first-of-type,.stage:not(.layout-gallery) video[data-source=screen_share],.stage:not(.layout-gallery) video[data-source=screenShare]{order:-1;align-self:stretch;max-width:100%;max-height:min(62vh,720px);min-height:200px}.stage:not(.layout-gallery) video:only-child{max-height:min(62vh,720px);min-height:220px;max-width:100%}.stage video[data-source=screen_share],.stage video[data-source=screenShare]{order:-2;object-fit:contain;background:#000;max-height:min(72vh,860px);min-height:240px;max-width:100%;align-self:stretch}.stage.layout-gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));align-content:start}.stage.layout-gallery video{order:0;align-self:stretch;max-width:100%;min-height:120px;max-height:200px}.stage.layout-gallery video[data-source=screen_share],.stage.layout-gallery video[data-source=screenShare]{grid-column:1 / -1;max-height:min(52vh,560px);min-height:200px}.stage-placeholder{position:absolute;top:0;right:0;bottom:0;left:0;z-index:0;display:grid;place-content:center;gap:8px;text-align:center;pointer-events:none;color:#94a3b8;animation:fade-soft .45s ease}.stage-placeholder-mark{font-family:var(--m-font-display);font-size:clamp(28px,5vw,42px);font-weight:700;letter-spacing:.08em;color:#e2e8f047;display:grid;place-items:center}.stage-placeholder-logo{height:clamp(28px,6vw,42px);width:auto;max-width:min(220px,70vw);object-fit:contain;opacity:.85}.stage-placeholder p{margin:0;font-size:13px;color:#64748b}@keyframes fade-soft{0%{opacity:0}to{opacity:1}}.control-dock{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px;margin-top:10px;padding:10px 12px;border-radius:12px;background:#0f172ab8;border:1px solid var(--room-line);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);flex-shrink:0}.control-group{display:flex;flex-wrap:wrap;gap:8px}.control-group-end{margin-left:auto}.ctrl{min-height:40px;padding:8px 14px;border-radius:8px;border:1px solid rgba(148,163,184,.28);background:#ffffff0a;color:#f8fafc;transition:background .15s ease,border-color .15s ease,transform .15s ease}.ctrl:hover:not(:disabled){background:#ffffff14;border-color:#93c5fd8c;color:#fff}.ctrl.on{background:#1677ff38;border-color:#60a5faa6;color:#dbeafe}.ctrl.ghost{background:transparent}.ctrl.danger{background:#f43f5e29;border-color:#fb71858c;color:#fecdd3}.ctrl.danger:hover:not(:disabled){background:#f43f5e47;border-color:#fb7185;color:#fff}.ctrl.ctrl-live{border-color:#f8717173;color:#fecaca}.ctrl.ctrl-live.on{background:#ef444447;border-color:#f87171d9;color:#fff;box-shadow:0 0 0 1px #ef444440}.ctrl:active:not(:disabled){transform:translateY(1px)}.op-banner{margin:8px 2px 0;padding:8px 10px;border-radius:8px;background:#2563eb1f;border:1px solid rgba(59,130,246,.28);color:#bfdbfe;font-size:12px;line-height:1.5}.rejoin-banner{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;padding:12px 16px;background:#b91c1cf0;color:#fff;z-index:8}.rejoin-copy{display:flex;flex-direction:column;gap:4px;min-width:0;flex:1 1 220px;font-size:13px;line-height:1.45}.rejoin-copy strong{font-size:14px}.rejoin-copy span{opacity:.92}.rejoin-actions{display:flex;flex-wrap:wrap;gap:8px}.rejoin-banner button.secondary{background:transparent;color:#fff;border-color:#ffffff73}.conn-banner{display:flex;align-items:center;justify-content:center;gap:10px;padding:10px 16px;font-size:13px;line-height:1.45;text-align:center;z-index:8}.conn-connecting{background:#2563eb38;border-bottom:1px solid rgba(59,130,246,.35);color:#bfdbfe}.conn-reconnecting{background:#ca8a0447;border-bottom:1px solid rgba(250,204,21,.4);color:#fef3c7}.conn-dot{width:8px;height:8px;border-radius:50%;background:currentColor;flex-shrink:0;animation:rec-pulse 1s ease-in-out infinite}.teacher-panel{margin-top:10px;border-radius:10px;border:1px solid var(--room-line);background:#0f172a8c;color:#cbd5e1}.teacher-panel>summary{cursor:pointer;list-style:none;padding:10px 12px;font-size:13px;font-weight:600;color:#e2e8f0;-webkit-user-select:none;user-select:none}.teacher-panel>summary::-webkit-details-marker{display:none}.teacher-panel[open]>summary{border-bottom:1px solid var(--room-line)}.teacher-panel-body{padding:12px}.teacher-panel .record-list{margin-top:10px}.teacher-panel .plist{border-bottom-color:#94a3b829;color:#cbd5e1}.teacher-panel .hint{margin-top:10px;color:#94a3b8}.host-manage .toolbar,.host-manage .announce-row{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:10px}.host-manage .announce-row input{flex:1 1 160px;min-width:0}.host-manage .record-list{margin-top:10px}.host-manage .hint{margin-top:10px;font-size:12px;color:var(--m-text-3)}.manage-dock-hint{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:10px;padding:10px 12px;border-radius:10px;border:1px solid var(--room-line);background:#0f172a8c;color:#94a3b8;font-size:12px}.manage-pane .host-manage{color:var(--m-text)}.manage-pane .toggle-line{color:var(--m-ink-2)}.manage-pane .hint{color:var(--m-text-3)}.teacher-panel .host-manage .announce-row input{background:#0b1220;border-color:#334155;color:#e2e8f0}.teacher-panel .host-manage .hint{color:#94a3b8}.room-rail{display:flex;flex-direction:column;min-height:0;background:#f8fafcfa;color:var(--m-text);border-left:1px solid rgba(15,23,42,.08);z-index:6}.rail-tabs{display:flex;flex-wrap:wrap;gap:2px;padding:10px 10px 0;border-bottom:1px solid var(--m-border);background:#fff}.rail-tabs button{flex:1 1 auto;min-width:4.2em;border:0;background:transparent;color:var(--m-text-3);border-radius:8px 8px 0 0;padding:10px 8px;font-weight:500;font-size:13px}.rail-tabs button:hover:not(:disabled){background:#f8fafc;color:var(--m-ink-2)}.rail-tabs button.active{color:var(--m-brand);background:#f8fafc;box-shadow:inset 0 -2px 0 var(--m-brand)}.rail-pane{flex:1;min-height:0;display:flex;flex-direction:column;padding:10px 12px 12px;overflow:auto}.chat-pane{padding-bottom:10px}.chat{flex:1;overflow:auto;min-height:140px;padding:4px 2px 10px}.chat-empty{color:var(--m-text-3);font-size:13px;padding:24px 8px;text-align:center}.chat .msg{margin-bottom:12px}.msg-head{display:flex;align-items:baseline;gap:8px;margin-bottom:2px}.msg-head b{font-size:13px;font-weight:600;color:var(--m-ink)}.msg-time{font-size:11px;color:var(--m-text-3);font-variant-numeric:tabular-nums}.msg-body{margin:0;font-size:13px;line-height:1.55;color:var(--m-ink-2);word-break:break-word}.msg-status{margin-left:auto;font-size:11px;color:var(--m-text-3)}.msg-status.fail{color:var(--m-danger)}.chat .msg.msg-failed{padding:8px;margin-left:-4px;margin-right:-4px;border-radius:8px;background:#fff2f0;border:1px solid #ffccc7}.msg-retry-row{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-top:6px}.msg-fail-tip{font-size:12px;color:var(--m-danger);flex:1 1 auto}.chat-compose{display:flex;gap:8px;padding-top:8px;border-top:1px solid var(--m-border)}.chat-compose input{flex:1}.plist{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:flex-start;gap:8px;font-size:13px;padding:9px 0;border-bottom:1px solid var(--m-border);color:var(--m-text)}.plist:last-child{border-bottom:0}.plist small{margin-left:6px;color:var(--m-brand);font-size:12px}.plist-actions{display:inline-flex;flex-wrap:wrap;gap:4px;flex-shrink:0;max-width:100%;justify-content:flex-end}.av-panel{margin-top:10px;border-radius:10px;border:1px solid var(--room-line);background:#0f172a8c;color:#cbd5e1}.av-panel>summary{cursor:pointer;list-style:none;padding:10px 12px;font-size:13px;font-weight:600;color:#e2e8f0;-webkit-user-select:none;user-select:none}.av-panel>summary::-webkit-details-marker{display:none}.av-panel[open]>summary{border-bottom:1px solid var(--room-line)}.av-panel-body{padding:12px}.av-row{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:10px}.av-row label{min-width:64px;font-size:12px;color:#94a3b8}.av-row select{flex:1 1 180px;min-width:0;background:#0b1220;border:1px solid #334155;color:#e2e8f0;border-radius:6px;padding:6px 8px}.vol-slider{flex:1 1 120px;accent-color:#1677ff}.vol-num{font-size:12px;color:#94a3b8;min-width:40px}.rail-scrim{display:none}@media(max-width:900px){.room-body{grid-template-columns:1fr}.rail-toggle{display:inline-flex}.room-rail{position:fixed;top:0;right:0;bottom:0;width:min(100vw,380px);padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px);border-left:1px solid var(--m-border);transform:translate(105%);transition:transform .28s ease;box-shadow:-12px 0 40px #0f172a33}.room-shell.rail-open .room-rail{transform:translate(0)}.rail-scrim{display:block;position:fixed;top:0;right:0;bottom:0;left:0;background:#0f172a73;z-index:5;animation:fade-soft .2s ease}.stage-col{padding:10px 10px calc(10px + env(safe-area-inset-bottom,0px))}.control-dock{position:sticky;bottom:0;z-index:3;padding-bottom:calc(10px + env(safe-area-inset-bottom,0px))}.stage:not(.layout-gallery) video:first-of-type,.stage:not(.layout-gallery) video[data-source=screen_share],.stage:not(.layout-gallery) video[data-source=screenShare],.stage:not(.layout-gallery) video:only-child{max-height:min(48vh,520px)}}@media(min-width:901px){.rail-toggle{display:none}}@media(max-width:560px){.room-bar{padding:8px 10px;padding-top:calc(8px + env(safe-area-inset-top,0px))}.room-bar-status .chip{font-size:11px;padding:2px 7px}.ctrl{flex:1 1 calc(50% - 8px);text-align:center}.control-group,.control-group-end{width:100%}.control-group-end{margin-left:0}.stage.layout-gallery{grid-template-columns:1fr;padding:8px}.plist{flex-direction:column;align-items:stretch}.plist-actions{width:100%;justify-content:flex-start}.plist-actions .mini{flex:1 1 calc(50% - 4px);min-height:36px}}@media(max-width:900px)and (orientation:landscape){.stage:not(.layout-gallery) video:first-of-type,.stage:not(.layout-gallery) video[data-source=screen_share],.stage:not(.layout-gallery) video[data-source=screenShare],.stage:not(.layout-gallery) video:only-child{max-height:min(70vh,480px);min-height:140px}.stage-frame{min-height:140px}}.playback-video{width:100%;max-height:360px;background:#000;border-radius:var(--m-radius);margin:12px 0;border:1px solid var(--m-border)}.mini-link{font-size:12px;color:var(--m-brand);margin-left:8px}.panel{padding:10px 12px;background:#fafafa;border:1px solid var(--m-border);border-radius:var(--m-radius)}.panel-title{font-weight:600;margin-bottom:8px;font-size:13px;color:var(--m-text)}.btn-link{display:inline-block;padding:7px 15px;border-radius:var(--m-radius);background:var(--m-brand);color:#fff!important;text-decoration:none;border:1px solid transparent}.btn-link:hover{background:var(--m-brand-hover);color:#fff!important}.toolbar{display:flex;flex-wrap:wrap;gap:8px}.app-root{min-height:100%}.toast{position:fixed;left:50%;bottom:calc(28px + env(safe-area-inset-bottom,0px));transform:translate(-50%);z-index:9999;max-width:min(90vw,420px);padding:10px 16px;border-radius:8px;background:#000000d1;color:#fff;font-size:14px;line-height:1.4;box-shadow:0 8px 24px #00000040;pointer-events:none}.toast-error{background:#cf1322eb}.toast-ok{background:#389e0deb}.announce-banner{margin:0;padding:10px 16px;background:#fa8c162e;border-bottom:1px solid rgba(250,140,22,.35);color:#fde68a;font-size:13px;line-height:1.5;text-align:center}.stay-tip-banner{display:flex;align-items:center;justify-content:center;gap:10px;margin:0;padding:8px 14px;background:#0ea5a024;border-bottom:1px solid rgba(14,165,160,.32);color:#99f6e4;font-size:12px;line-height:1.5;text-align:center}.stay-tip-banner .stay-tip-dismiss{flex:0 0 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