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40px)}.glass-preview{--g-bg:#0c1421;--g-surface:#142136;--g-glass:rgba(20,33,54,.9);--g-text:#edf4ff;--g-muted:#bdcbde;--g-line:#40526c;--g-accent:#b8d7ff;--g-on:#122b48;--g-soft:#253b58;--g-focus:#e2f0ff;--bg:var(--g-bg);--surface:var(--g-surface);--input:var(--g-bg);--text:var(--g-text);--muted:var(--g-muted);--line:var(--g-line);--accent:var(--g-accent);--on-accent:var(--g-on);--soft:var(--g-soft);--focus:var(--g-focus);background:radial-gradient(ellipse at 0 0,#233e5b 0,transparent 50%),radial-gradient(ellipse at 100% 100%,#1e2946 0,transparent 42%),var(--g-bg);color:var(--g-text);height:100dvh;min-height:640px;display:flex;flex-direction:column;padding:0 24px 18px;font:14px/1.5 Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,Segoe 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var(--g-line);border-radius:14px;background:var(--g-glass);overflow:visible;flex:0 0 auto;margin:0;max-width:100%}.glass-preview .frame-tab{font-size:12px;min-height:44px;border:1px solid transparent;border-radius:9px;background:transparent;color:var(--g-muted);gap:8px;padding:9px 16px;flex:0 1 auto}.glass-preview .frame-tab.chosen{background:var(--g-soft);color:var(--g-accent);border-color:var(--g-accent);box-shadow:inset 0 0 0 1px #ffffff08}.glass-preview .frame-tab:not(:disabled):hover{color:var(--g-text);background:var(--g-soft)}.glass-preview .frame-tab:disabled{background:transparent;color:var(--g-muted);opacity:.48}.glass-preview .frame-composite{margin:0}.glass-preview .stage-body{flex:1 1 0;min-height:160px;gap:12px;background:transparent;grid-template-columns:minmax(0,1fr)}.glass-preview .has-roster .stage-body{grid-template-columns:minmax(0,1fr) 290px}.glass-preview .stage-picture{height:100%;min-height:0;overflow:hidden;border-radius:16px;border:1px solid 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h2{font-size:16px;font-weight:550}.glass-preview .roster-heading .icon-btn{width:36px;height:36px;background:var(--g-soft);border:1px solid var(--g-line);color:var(--g-text);border-radius:9px;display:grid;place-items:center}.glass-preview .stage-roster .mini-button{min-height:40px;font-size:11px;padding:8px 10px}.glass-preview .stage-roster>.mini-button{width:100%;font-size:10px}.glass-preview .live-person{border-color:var(--g-line);padding:16px 0;gap:10px;font-size:13px}.glass-preview .live-person strong{font-size:12px;font-weight:550}.glass-preview .live-person small{color:var(--g-muted);font-size:10px}.glass-preview .person-avatar{background:var(--g-soft);color:var(--g-accent);font-size:12px;width:34px;height:34px;flex-basis:34px}.glass-preview .hand-label{color:var(--g-text);font-size:10px;display:flex;gap:5px;align-items:center}.glass-preview .hand-count{background:var(--g-soft);color:var(--g-accent);border:1px solid var(--g-line);font-size:10px;padding:3px 6px}.glass-preview .stage-roster>p{font-size:12px;color:var(--g-muted)}.glass-preview .stage-messages{flex:0 0 auto;padding:0 6px;color:var(--g-muted);font-size:11px}.glass-preview .stage-messages:empty{display:none}.glass-preview .stage-mic-state{font-size:11px;padding:0;display:flex;align-items:center;gap:7px}.glass-preview .stage-messages .notice{font-size:12px;border-radius:10px;padding:9px 12px;margin:0;background:var(--g-soft);border:1px solid var(--g-line);color:var(--g-text)}.glass-preview .classroom-stage .stage-dock{flex:0 0 auto;border-radius:16px;padding:0 14px 10px;position:relative;inset:auto;transform:none;width:100%;max-width:100%;z-index:3}.glass-preview .dock-handle{border:0!important;background:transparent!important;color:var(--g-muted);border-radius:8px!important;font-size:10px!important;min-height:30px!important;padding:5px 14px!important;touch-action:pan-x}.glass-preview .dock-panel{gap:8px;padding-top:0;overflow:visible;max-height:none}.glass-preview .dock-buttons{gap:7px;align-items:stretch;flex-wrap:wrap}.glass-preview .classroom-stage .dock-buttons>.mini-button{min-height:62px;flex:1 1 112px;max-width:none;display:flex;flex-direction:column;gap:5px;padding:9px 10px;font-size:11px;line-height:1.4;border-color:transparent}.glass-preview .dock-buttons>.mini-button>svg{width:21px;height:21px}.glass-preview .classroom-stage .media-control[aria-pressed=true],.glass-preview .classroom-stage .hand-active{background:var(--g-soft);border-color:var(--g-line);color:var(--g-accent)}.glass-preview .classroom-stage .mini-button:disabled{color:var(--g-muted);opacity:.55;background:transparent;cursor:not-allowed}.glass-preview .classroom-stage .dock-buttons>.leave-control{margin:0 0 0 auto;flex:0 1 120px;border:1px solid var(--g-line);background:var(--g-soft);color:var(--g-text)}.glass-preview .classroom-stage .dock-buttons>.danger{border:1px solid #b97d86;background:#7e2e3e26;color:#ffbdc5;flex:0 1 140px;font-size:10px}.glass-preview[data-theme=light] .classroom-stage .dock-buttons>.danger{color:#8b2234;background:#fff1f2;border-color:#bd7c86}.glass-preview .classroom-settings{order:2;border-color:var(--g-line);padding-top:0}.glass-preview .classroom-settings summary{padding:5px 2px;min-height:28px;font-size:10px;color:var(--g-muted);width:fit-content}.glass-preview .classroom-settings[open] .dock-selectors{padding:12px 0 6px}.glass-preview .dock-selectors .field{min-width:160px}.glass-preview .field>span{font-size:11px;color:var(--g-muted);font-weight:500}.glass-preview .field select{background:var(--g-surface);border:1px solid var(--g-line);color:var(--g-text);border-radius:8px;min-height:44px;padding:9px 10px;font-size:12px}.glass-preview .dock-volume input{accent-color:var(--g-accent)}.glass-preview .class-gallery{gap:12px;padding:16px;align-content:start}.glass-preview .pupil-tile{border:1px solid 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.stage-dock{background:var(--g-glass);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}}@media(max-width:1000px){.glass-preview{padding:0 16px 14px}.glass-preview .stage-header strong{font-size:14px}.glass-preview .stage-actions .mini-button{font-size:11px;padding:8px 10px}.glass-preview .stage-actions{gap:6px}.glass-preview .has-roster .stage-body{grid-template-columns:minmax(0,1fr) 260px}.glass-preview .stage-roster{padding:14px}.glass-preview .classroom-stage .dock-buttons>.mini-button{flex-basis:95px;font-size:10px;min-height:60px}.glass-preview .classroom-stage .dock-buttons>.danger{flex-basis:110px}.glass-preview .classroom-stage .dock-buttons>.leave-control{flex-basis:95px}.glass-preview .frame-tab{padding:8px 12px}}@media(max-width:760px){.glass-preview{padding:0 10px 10px;min-height:700px;height:100dvh}.glass-specimen-label{font-size:7px;height:23px;flex-basis:23px;letter-spacing:.07em}.glass-product-bar{min-height:62px;flex-basis:62px;gap:12px;padding:0 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.field>span{font-size:10px}.glass-preview .teacher-pip{min-width:95px;right:8px;bottom:8px;width:27%;border-radius:8px}.glass-preview .teacher-pip small{font-size:8px;padding:2px 5px}.glass-preview .class-gallery{gap:7px;padding:8px;grid-template-columns:repeat(2,minmax(0,1fr))}.glass-preview .pupil-caption{padding:7px;gap:5px}.glass-preview .pupil-caption strong{font-size:10px}.glass-preview .pupil-caption .mini-button{min-height:32px;font-size:9px;padding:5px;line-height:1.3}.glass-preview .tile-hand{font-size:8px;padding:3px;top:4px;left:4px;gap:3px}.glass-preview .tile-hand svg{width:14px;height:14px}.glass-preview .live-classroom:not(:has(.classroom-stage)){margin-top:18px}.glass-preview .live-classroom:not(:has(.classroom-stage)) .page-title h1{font-size:24px}.glass-preview .live-devices{grid-template-columns:1fr;padding:18px}.glass-preview .classroom-stage.is-immersive{padding:8px;gap:8px}.glass-preview .classroom-stage.is-immersive .stage-header>div:first-child{display:block}.glass-preview .classroom-stage.is-immersive .stage-body{min-height:80px}.glass-preview .classroom-stage.is-immersive .stage-dock,.glass-preview .classroom-stage.is-immersive.has-roster .stage-dock{padding:0 8px 7px;border-radius:13px}.glass-preview .classroom-stage.is-immersive .dock-panel{max-height:30dvh}.glass-preview .classroom-stage.is-immersive .teacher-pip{bottom:8px}}@media(max-width:359px){.glass-brand strong{font-size:14px}.glass-brand small{font-size:8px}.glass-preview .stage-header strong{font-size:12px}.glass-preview .frame-tab{padding:7px 5px;font-size:10px}.glass-preview .classroom-stage .stage-actions .mini-button{padding:7px;font-size:9px}.glass-preview .stage-actions .mini-button svg{width:14px}}@media(max-height:520px)and (orientation:landscape){.glass-preview{min-height:520px}.glass-preview .classroom-stage.is-immersive{gap:5px;padding:6px}.glass-preview .classroom-stage.is-immersive .stage-header{min-height:0;padding:6px 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.dock-buttons>.mini-button{min-width:0;min-height:70px;font-size:11px;padding:8px 4px}.glass-preview .dock-buttons:has(>.danger){grid-template-columns:repeat(3,minmax(0,1fr))}.glass-preview .classroom-stage .dock-buttons>.danger{grid-column:span 2;font-size:11px}.glass-preview .classroom-settings summary{font-size:11px;min-height:30px}.glass-preview .dock-handle{font-size:11px!important;min-height:30px!important}}@media(max-height:520px)and (orientation:landscape){.glass-preview .classroom-stage.is-immersive .dock-buttons{display:flex}.glass-preview .classroom-stage.is-immersive .dock-buttons>.mini-button{min-height:44px;font-size:10px}.glass-preview .classroom-stage.is-immersive .frame-tab{min-height:36px}}@media(prefers-reduced-motion:reduce){.glass-preview .mini-button{transition:none}}.glass-preview .classroom-frames[hidden]{display:none!important}.glass-preview .class-gallery{height:100%;min-height:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-auto-rows:minmax(0,1fr);align-content:stretch;padding:16px 20px 90px;gap:12px;position:relative;overflow:auto}.glass-preview .pupil-tile{position:relative;min-height:0;overflow:hidden;border:1px solid #ffffff24;border-radius:14px;background:#101b2a;box-shadow:0 8px 24px #0003}.glass-preview .pupil-picture{height:100%;min-height:100px;aspect-ratio:auto}.glass-preview .pupil-picture>.live-video{height:100%}.glass-preview .pupil-picture .live-video video{width:100%;height:100%;object-fit:contain}.glass-preview .pupil-caption{position:absolute;inset:auto 0 0;display:flex;align-items:center;gap:10px;padding:30px 12px 10px;background:linear-gradient(transparent,#060d19d9);color:#fff}.glass-preview .pupil-caption strong{flex:1;min-width:0;font-size:14px;text-shadow:0 1px 4px #000;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.glass-preview 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.gallery-pager{position:absolute;bottom:24px;left:50%;transform:translate(-50%);display:flex;align-items:center;gap:14px;padding:4px 8px;border:1px solid #ffffff20;border-radius:30px;background:#122033d9;color:#fff;z-index:2}.glass-preview .gallery-pager button{min-height:44px}@media(max-width:760px){.glass-preview .class-gallery{grid-template-columns:repeat(3,minmax(0,1fr));padding:10px 10px 90px;gap:6px}.glass-preview .pupil-caption{padding:24px 7px 7px;gap:4px}.glass-preview .pupil-caption strong{font-size:12px}.glass-preview .pupil-status-icons{gap:2px}.glass-preview .pupil-status-icons span{padding:2px}.glass-preview .pupil-status-icons svg{width:14px;height:14px}.glass-preview .pupil-caption>.mini-button{opacity:1;pointer-events:auto;font-size:10px;bottom:35px}.glass-preview .tile-hand{top:6px;left:6px;font-size:0;padding:6px}.glass-preview .class-gallery.speaker-layout{grid-template-rows:minmax(0,1fr) minmax(80px,22%)}}.teacher-classroom .glass-camera-trigger,.teacher-classroom .dock-selectors>label[hidden]{display:none!important}.glass-preview .classroom-stage.is-immersive .class-gallery{padding:84px 20px 170px}@media(max-width:760px){.glass-preview .classroom-stage.is-immersive .class-gallery{padding:76px 10px 160px}}.glass-preview .gallery-pager{bottom:114px}.teacher-classroom .stage-actions .sound-teacher-alert{display:flex;align-items:center;gap:6px;margin:0;padding:0;background:transparent;font-size:12px;color:#ffe2a4}.teacher-classroom .stage-actions .sound-teacher-alert>button{display:none}.glass-preview{--g-glass:rgba(14,25,37,.62);--g-line:rgba(236,245,255,.2)}.glass-preview:has([data-student-overlay]){position:fixed;inset:0;z-index:1000;padding:0;min-height:0;height:100dvh}.classroom-shell:has(.glass-preview .classroom-stage) .app-topbar{display:none}.glass-preview:has([data-student-overlay])>.glass-specimen-label,.glass-preview:has([data-student-overlay]) .live-classroom>.back-link{display:none}.glass-preview .classroom-stage[data-student-overlay],.glass-preview .classroom-stage[data-student-overlay].is-immersive{display:block;position:relative;height:100%;padding:0;border-radius:0;overflow:hidden;background:var(--g-bg);isolation:isolate}.glass-preview .classroom-stage[data-student-overlay].is-immersive{position:fixed;inset:0;height:100dvh}.glass-preview [data-student-overlay]>.stage-body{position:absolute;inset:0;width:100%;height:100%;min-height:0;z-index:0}.glass-preview [data-student-overlay] .stage-picture{border:0;border-radius:0;height:100%;box-shadow:none}.glass-preview .classroom-stage[data-student-overlay].has-roster>.stage-body{grid-template-columns:minmax(0,1fr)}.glass-preview [data-student-overlay]>.stage-header{position:absolute;inset:0 0 auto;z-index:5;margin:0;display:grid;grid-template-columns:auto minmax(0,1fr) auto auto;align-items:center;gap:20px;min-height:68px;padding:12px 22px;border:0;border-bottom:1px solid var(--g-line);border-radius:0;background:var(--g-glass);box-shadow:0 12px 30px #0003}.glass-preview [data-student-overlay]>.stage-header>div:first-child{grid-column:2;grid-row:1;min-width:0;padding:0}.glass-preview [data-student-overlay]>.stage-header>.stage-actions{grid-column:3;grid-row:1;width:auto}.glass-preview [data-student-overlay] .glass-unified-brand{grid-column:1;grid-row:1;gap:9px}.glass-preview .glass-unified-brand strong{font-size:15px;white-space:nowrap}.glass-preview .glass-unified-brand img{width:32px;height:36px}.glass-floating-language{position:absolute;right:16px;top:12px;z-index:9;color:#c4d0dc}.glass-preview [data-student-overlay]>.stage-header>.glass-floating-language{position:static;grid-column:4;grid-row:1;justify-self:end}.glass-floating-language>span{position:absolute;width:1px;height:1px;clip-path:inset(50%);overflow:hidden}.glass-floating-language select{min-height:44px;min-width:54px;background:transparent;border:0;color:inherit;font:inherit;font-size:12px;padding:9px;cursor:pointer}.glass-floating-language option{background:#142136;color:#edf4ff}.glass-preview [data-student-overlay]>.classroom-frames{position:absolute;left:0;top:50%;transform:translateY(-50%);z-index:6;margin:0;width:220px;max-width:calc(100% - 56px);display:flex;flex-direction:column;align-items:stretch;gap:2px;padding:10px 8px;border:0;border-right:1px solid var(--g-line);border-radius:0;background:var(--g-glass);box-shadow:16px 0 36px #0003}.glass-preview [data-student-overlay] .frame-tab{justify-content:flex-start;flex:0 0 auto;min-height:46px;width:100%;padding:11px 14px;white-space:normal;border:0;border-radius:0;background:transparent;box-shadow:none}.glass-preview [data-student-overlay] .frame-tab[aria-pressed=true]{background:#ebf5ff1a;box-shadow:inset 2px 0 #d9e9f8;color:#f3f8ff}.glass-preview [data-student-overlay]>.stage-dock,.glass-preview .classroom-stage[data-student-overlay].is-immersive>.stage-dock{position:absolute;inset:auto 0 0;transform:none;z-index:5;margin:0;width:100%;padding:16px 184px max(12px,env(safe-area-inset-bottom)) 22px;border:0;border-top:1px solid var(--g-line);border-radius:0;background:var(--g-glass);box-shadow:0 -16px 40px #0004}.glass-preview [data-student-overlay] .dock-panel{overflow:visible;max-height:none;padding:0}.glass-preview [data-student-overlay] .classroom-settings{display:none}.glass-preview [data-student-overlay] .dock-buttons{justify-content:flex-start;gap:12px}.glass-preview [data-student-overlay] .dock-buttons>.mini-button,.glass-preview [data-student-overlay] .stage-actions>.mini-button{background:transparent;border:0;box-shadow:none;border-radius:6px}.glass-preview [data-student-overlay] .dock-buttons>.mini-button:hover,.glass-preview [data-student-overlay] .stage-actions>.mini-button:hover{background:#ffffff12}.glass-preview [data-student-overlay] .dock-buttons>.hand-active{background:#ffffff19;color:#fff;box-shadow:inset 0 -2px #d8e9f9}.glass-preview .glass-mic-host{margin-top:8px;color:var(--g-muted)}.glass-preview .glass-mic-host .stage-mic-state{display:flex;align-items:center;gap:7px;font-size:11px;line-height:1.5}.glass-preview .classroom-stage[data-student-overlay]>.stage-messages{position:absolute;inset:auto auto calc(var(--glass-dock-height,130px) + 12px) 18px;z-index:7;margin:0;padding:8px 12px;background:var(--g-glass);width:max-content;max-width:min(520px,calc(100% - 36px));box-shadow:0 4px 20px #0003}.glass-preview .classroom-stage[data-student-overlay][data-bottom-open=false]>.stage-messages{bottom:88px}.glass-preview [data-student-overlay]>.stage-messages:empty{display:none}.glass-top-trigger,.glass-camera-trigger{position:absolute;z-index:8;display:grid;place-items:center;width:48px;min-height:44px;padding:0;border:0;border-radius:0;background:transparent;color:#f1f7ff;box-shadow:none;cursor:pointer;filter:drop-shadow(0 2px 5px #000)}.glass-top-trigger>svg,.glass-camera-trigger>svg{stroke-width:2.4}.glass-top-trigger{left:50%;transform:translate(-50%);top:max(0px,env(safe-area-inset-top))}.glass-preview [data-top-open=true]>.glass-top-trigger{top:calc(var(--glass-upper-height,92px) - 24px)}.glass-camera-trigger{left:0;top:50%;transform:translateY(-50%);opacity:1;transition:opacity .16s cubic-bezier(.22,1,.36,1),transform .16s cubic-bezier(.22,1,.36,1)}.glass-preview [data-camera-open=true]>.glass-camera-trigger{opacity:0;transform:translate(-8px,-50%);pointer-events:none}.glass-bottom-hotspot{position:absolute;inset:auto 0 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8px);right:-48px;width:252px;padding:18px;background:var(--g-glass);border-top:1px solid var(--g-line);box-shadow:0 -8px 28px #0005}.glass-quality-panel strong{font-size:13px;font-weight:550}.glass-quality-panel .field{margin-top:12px;min-width:0}.glass-quality-panel .field>span{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}.glass-preview .glass-quality-panel .field select{width:100%;min-height:44px;padding:8px 0;background:transparent;border:0;border-bottom:1px solid var(--g-line);border-radius:0;color:var(--g-text);font-size:12px}.glass-preview .glass-quality-panel .field select:disabled{color:#b3bfcc;opacity:1;appearance:none}.glass-quality-panel small{display:block;font-size:11px;color:var(--g-muted);margin-top:8px}.glass-phone-rotation{display:none}.glass-rotation-hint{position:absolute;right:0;bottom:calc(100% + 12px);width:min(270px,calc(100vw - 32px));padding:12px 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