:root{color-scheme:dark;font-family:system-ui,sans-serif;--bg: #0a0c12;--panel: #11151f;--panel-2: #161b28;--border: #1e2533;--accent: #4e9af1;--text: #e6ebf2;--muted: #8a93a6}*{box-sizing:border-box}body{margin:0;background:radial-gradient(1200px 600px at 70% -10%,#16203a 0%,var(--bg) 60%);color:var(--text)}.app{display:flex;flex-direction:column;height:100vh}.app-header{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;border-bottom:1px solid var(--border);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}.app-title{font-size:18px;font-weight:700}.app-floor{color:var(--muted);font-weight:400}.app-me{font-size:14px;color:var(--muted);background:var(--panel-2);border:1px solid var(--border);padding:6px 12px;border-radius:999px}.app-body{display:flex;gap:16px;padding:16px;flex:1;min-height:0}.stage{flex:1;position:relative;min-width:0;min-height:0}.floor-canvas{position:absolute;top:0;right:0;bottom:0;left:0;border-radius:14px;border:1px solid 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var(--border);border-radius:12px;padding:10px}.whiteboard-bar{display:flex;align-items:center;gap:12px;margin-bottom:8px;font-size:13px}.whiteboard-colors{display:flex;gap:6px;margin-left:auto}.swatch{width:22px;height:22px;border-radius:50%;padding:0;border:2px solid transparent}.swatch.active{border-color:#fff}.whiteboard-canvas{width:100%;height:auto;aspect-ratio:1000 / 420;background:#0f1320;border:1px solid var(--border);border-radius:8px;touch-action:none;cursor:crosshair}@media (max-width: 900px){.app-body{flex-direction:column}.sidebar{width:100%;flex-direction:row;flex-wrap:wrap}.sidebar>*{flex:1 1 240px}}.presence-list h3,.admit-panel h3{margin:0 0 10px;font-size:14px}.presence-list ul,.admit-panel ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}.presence-list 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#2b3550;border-top-color:var(--accent);border-radius:50%;animation:spin .9s linear infinite;margin-bottom:8px}@keyframes spin{to{transform:rotate(360deg)}}.login{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}.login-card{width:100%;max-width:380px;background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:28px;box-shadow:0 24px 70px #00000080}.login-brand{font-weight:800;letter-spacing:1px;color:var(--accent);font-size:13px;text-transform:uppercase}.login-card h1{margin:6px 0 4px;font-size:24px}.login-sub{margin:0 0 18px;color:var(--muted);font-size:14px}.login-card form{display:flex;flex-direction:column;gap:8px}.login-card label{font-size:13px;color:var(--muted)}.login-primary{margin-top:6px;background:var(--accent);border-color:var(--accent);font-weight:600;padding:11px}.login-hint{font-size:12px;color:var(--muted);margin:14px 0 0;line-height:1.5}.login-divider{text-align:center;color:var(--muted);font-size:12px;margin:18px 0 12px;position:relative}.login-divider:before,.login-divider:after{content:"";position:absolute;top:50%;width:28%;height:1px;background:var(--border)}.login-divider:before{left:0}.login-divider:after{right:0}.login-demo{display:flex;gap:8px}.login-demo button{flex:1;font-size:13px;padding:9px 6px}