:root{--bg:#f7fcfa;--surface:#ffffff;--surface-strong:#f0f9f7;--text:#2d3748;--muted:#64748b;--line:#d9e7e2;--primary:#4ecdc4;--primary-dark:#2aa89e;--accent:#ffe66d;--danger:#ff8a80;--warning:#f9c74f;--good:#16855f;--coral:#ff8a80;--shadow:0 18px 50px rgba(24,86,75,0.12)}.dark{--bg:#1a202c;--surface:#2d3748;--surface-strong:#4a5568;--text:#e2e8f0;--muted:#a0aec0;--line:#4a5568;--primary:#4ecdc4;--primary-dark:#38b2ac;--accent:#f6e05e;--danger:#fc8181;--warning:#ed8936;--good:#48bb78;--coral:#fc8181;--shadow:0 18px 50px rgba(0,0,0,0.3)}*{box-sizing:border-box}html{background:var(--bg);color:var(--text);font-family:ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}body{margin:0;min-height:100vh}button,input,select,textarea{font:inherit}button{cursor:pointer}button:focus-visible{outline:2px solid var(--primary);outline-offset:2px}[role=listitem]{outline:none}[role=listitem]:focus-visible{outline:2px solid 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12px;position:relative}.login-divider:after,.login-divider:before{content:"";position:absolute;top:50%;width:22%;height:1px;background:var(--line)}.login-divider:before{left:0}.login-divider:after{right:0}.video-player{width:100%;max-height:420px;border-radius:12px;background:#000;aspect-ratio:16/9}.stat-tile{padding:16px;border-radius:12px;border:1px solid var(--line);background:var(--surface)}.stat-tile .stat-label{color:var(--muted);font-size:.86rem;margin:0 0 4px}.stat-tile .stat-value{font-size:1.7rem;font-weight:800;margin:0}.form-group input,.form-group select,.form-group textarea,.modal{background:var(--surface);color:var(--text)}@media (max-width:640px){.attendance-summary{grid-template-columns:repeat(2,1fr)}.role-switch{flex-wrap:wrap}}