:root{color-scheme:light;--page-bg:#f5f7fa;--panel-bg:#ffffff;--ink:#18202f;--muted:#687284;--line:#d9e0ea;--brand:#256f6c;--brand-soft:#e8f3f2;--danger:#b42318}*{box-sizing:border-box}body,html{min-height:100%;margin:0;background:var(--page-bg);color:var(--ink)}body{font-family:Arial,Helvetica,sans-serif}a{color:inherit;text-decoration:none}.platform-shell{min-height:100vh}.platform-login-page{min-height:100vh;padding:24px}.platform-sider{border-right:1px solid var(--line);background:var(--panel-bg)}.platform-logo{height:56px;display:flex;align-items:center;gap:10px;padding:0 18px;border-bottom:1px solid var(--line);font-weight:700}.platform-logo-mark{width:26px;height:26px;border-radius:6px;background:var(--brand)}.platform-header{height:56px;display:flex;align-items:center;justify-content:space-between;padding:0 24px;border-bottom:1px solid var(--line);background:var(--panel-bg)}.platform-content{padding:24px}.platform-login{width:min(420px,calc(100vw - 32px));margin:12vh auto 0;padding:24px;border:1px solid var(--line);border-radius:8px;background:var(--panel-bg)}.toolbar{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:18px}.summary-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-gap:12px;gap:12px;margin-bottom:18px}.summary-tile{min-height:88px;padding:16px;border:1px solid var(--line);border-radius:8px;background:var(--panel-bg);color:inherit;text-align:left;cursor:pointer}.summary-label{display:block;color:var(--muted);font-size:13px}.summary-value{display:block;margin-top:8px;font-size:28px;font-weight:700}.work-panel{border:1px solid var(--line);border-radius:8px;background:var(--panel-bg)}.room-page{min-height:100vh;padding:24px;background:var(--page-bg)}.room-panel{max-width:1120px;margin:0 auto}.room-header{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 0}.room-title{margin-top:10px}.room-stage{position:relative;margin-top:18px}.room-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-gap:16px;gap:16px}.room-grid[data-tile-count="1"]{grid-template-columns:minmax(0,1fr)}.room-grid[data-tile-count="3"]{grid-template-columns:repeat(3,minmax(0,1fr))}.room-grid[data-tile-count="4"]{grid-template-columns:repeat(2,minmax(0,1fr))}.video-card{overflow:hidden;border:1px solid var(--line);border-radius:8px;background:var(--panel-bg)}.room-grid[data-tile-count="3"] .video-card-screen,.video-card-screen{grid-column:span 2}.video-tile{position:relative;width:100%;height:280px;overflow:hidden;background:#111827}.video-card-screen .video-tile{height:420px}.room-stage:-webkit-full-screen{background:#0b1220;color:#f3f4f6;height:100vh;width:100vw;padding:16px;overflow:auto}.room-stage-fullscreen,.room-stage:fullscreen{background:#0b1220;color:#f3f4f6;height:100vh;width:100vw;padding:16px;overflow:auto}.room-stage:-webkit-full-screen .room-grid{height:100%}.room-stage-fullscreen .room-grid,.room-stage:fullscreen .room-grid{height:100%}.room-stage:-webkit-full-screen .video-card{display:flex;min-height:0;flex-direction:column}.room-stage-fullscreen .video-card,.room-stage:fullscreen .video-card{display:flex;min-height:0;flex-direction:column}.room-stage:-webkit-full-screen .video-tile{flex:1 1;height:auto;min-height:0}.room-stage-fullscreen .video-tile,.room-stage:fullscreen .video-tile{flex:1 1;height:auto;min-height:0}.room-stage-exit{position:absolute;top:24px;right:24px;z-index:10}.empty-video{display:grid;place-items:center}.empty-video .ant-typography{color:#cbd5e1}.video-label{display:flex;align-items:center;gap:8px;min-height:40px;padding:0 12px;border-top:1px solid var(--line);color:var(--muted);font-size:13px}@media (max-width:900px){.platform-shell{display:block}.platform-sider{display:none}.platform-header,.room-header,.toolbar{align-items:flex-start;flex-direction:column}.room-grid,.summary-grid{grid-template-columns:1fr}}