:root{color-scheme:dark;--bg: #000;--fg: #f3f4f6;--muted: #6b7280;--accent: #3b82f6;--danger: #f87171}*{box-sizing:border-box}html,body,#root{margin:0;padding:0;width:100%;height:100%;background:var(--bg);color:var(--fg);font-family:-apple-system,BlinkMacSystemFont,PingFang TC,sans-serif;overflow:hidden}@supports (padding: env(safe-area-inset-bottom)){body{padding-bottom:env(safe-area-inset-bottom)}}.home{display:flex;align-items:center;justify-content:center;width:100%;height:100%}.home .ghost{font-family:ui-monospace,SF Mono,Menlo,monospace;font-size:12px;color:#1f2937;-webkit-user-select:none;user-select:none}.student-root{position:fixed;top:0;right:0;bottom:0;left:0;background:#000;width:100vw;height:100vh;width:100dvw;height:100dvh;overflow:hidden;cursor:default}.student-video{width:100%;height:100%;object-fit:contain;background:#000;display:block;touch-action:none;-webkit-user-select:none;user-select:none}.student-overlay{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;pointer-events:none;background:#0000008c;transition:opacity .22s ease}.student-overlay.fatal{background:#000000d9}.overlay-card{display:flex;align-items:center;gap:12px;padding:14px 22px;background:#141418eb;border:1px solid #1f2937;border-radius:999px;font-size:14px;color:#d1d5db;box-shadow:0 4px 30px #00000073}.overlay-card .dot{width:8px;height:8px;background:var(--accent);border-radius:50%;animation:pulse 1.4s ease-in-out infinite}.student-overlay.fatal .overlay-card .dot{background:var(--danger);animation:none}@keyframes pulse{0%,to{opacity:.35;transform:scale(1)}50%{opacity:1;transform:scale(1.25)}}.student-keyboard{position:fixed;top:0;right:0;bottom:0;left:0;width:100%;height:100%;opacity:.001;border:0;outline:none;padding:0;margin:0;background:transparent;color:transparent;font-size:16px;caret-color:transparent;-webkit-user-select:none;user-select:none;-webkit-appearance:none;z-index:5;touch-action:none;-webkit-tap-highlight-color:transparent}