:root{--primary-color: #0066ff;--primary-hover: #0052cc;--secondary-color: #002d4a;--bg-light: #f4f6f9;--bg-dark: #0a0e17;--card-bg: #ffffff;--card-border: #e2e8f0;--text-dark: #1e293b;--text-light: #f8fafc;--text-muted: #64748b;--success: #10b981;--danger: #ef4444;--warning: #f59e0b}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background-color:var(--bg-light);color:var(--text-dark);-webkit-font-smoothing:antialiased}h1,h2,h3,h4{color:var(--secondary-color);margin-top:0}a{color:var(--primary-color);text-decoration:none}a:hover{text-decoration:underline}.navbar{background-color:var(--primary-color);color:#fff;padding:15px 30px;display:flex;justify-content:space-between;align-items:center;box-shadow:0 4px 6px -1px #0000001a}.navbar-brand{font-size:1.3rem;font-weight:800;display:flex;align-items:center;gap:10px}.navbar-brand span{color:var(--primary-color)}.navbar-menu{display:flex;gap:20px;align-items:center}.navbar-link{color:#ffffffbf;font-weight:600;padding:8px 14px;border-radius:6px;transition:all .2s}.navbar-link:hover{color:#fff;background-color:#ffffff1a}.navbar-link.active{color:#fff;background-color:#fff3;font-weight:700}.main-content{max-width:1200px;margin:40px auto;padding:0 20px;box-sizing:border-box}.card{background:var(--card-bg);border:1px solid var(--card-border);border-radius:12px;padding:30px;box-shadow:0 4px 12px #00000008;margin-bottom:30px;transition:transform .2s ease,box-shadow .2s ease}.card-title{font-size:1.25rem;font-weight:700;border-bottom:2px solid #f1f5f9;padding-bottom:12px;margin-bottom:20px}.form-group{margin-bottom:20px}label{display:block;margin-bottom:6px;font-weight:600;font-size:.88rem;color:var(--text-dark)}input,select{width:100%;padding:12px 14px;background:#fff;border:1px solid #cbd5e1;border-radius:8px;color:var(--text-dark);font-size:.95rem;box-sizing:border-box;transition:all .2s ease}input:focus,select:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #0066ff26}.btn{padding:12px 20px;background-color:var(--primary-color);border:none;border-radius:8px;color:#fff;font-size:.95rem;font-weight:700;cursor:pointer;transition:all .2s ease;display:inline-flex;justify-content:center;align-items:center;gap:8px}.btn:hover{background-color:var(--primary-hover);transform:translateY(-1px)}.btn:active{transform:translateY(0)}.btn:disabled{background-color:#cbd5e1;color:#94a3b8;cursor:not-allowed;transform:none}.btn-secondary{background-color:#f1f5f9;color:var(--text-dark);border:1px solid #e2e8f0}.btn-secondary:hover{background-color:#e2e8f0}.btn-danger{background-color:var(--danger)}.btn-danger:hover{background-color:#dc2626}table{width:100%;border-collapse:collapse;margin-top:10px;text-align:left}th{background-color:#f8fafc;color:#475569;font-weight:700;font-size:.85rem;text-transform:uppercase;letter-spacing:.5px;padding:14px 16px;border-bottom:2px solid #e2e8f0;white-space:nowrap}td{padding:14px 16px;border-bottom:1px solid #e2e8f0;font-size:.95rem;color:#334155;white-space:nowrap}tr:hover td{background-color:#f8fafc}.badge{display:inline-flex;align-items:center;padding:4px 10px;border-radius:12px;font-size:.78rem;font-weight:700;text-transform:uppercase}.badge-success{background-color:#d1fae5;color:#065f46}.badge-danger{background-color:#fee2e2;color:#991b1b}.badge-warning{background-color:#fef3c7;color:#92400e}.dashboard-grid{display:grid;grid-template-columns:1fr;gap:30px}@media (min-width: 992px){.dashboard-grid{grid-template-columns:1.1fr 1.3fr}}.active-session-card{border-left:4px solid var(--primary-color);background:#fdfdfd;padding:16px;border-radius:10px;border-top:1px solid #e2e8f0;border-right:1px solid #e2e8f0;border-bottom:1px solid #e2e8f0;margin-bottom:15px;display:flex;justify-content:space-between;align-items:center;box-shadow:0 2px 4px #00000003}.session-timer{background:var(--secondary-color);color:#fff;padding:6px 12px;border-radius:8px;font-family:monospace;font-size:1rem;font-weight:700}.alert{padding:12px 16px;border-radius:8px;margin-bottom:20px;font-size:.9rem;font-weight:500}.alert-danger{background-color:#fef2f2;color:#b91c1c;border:1px solid #fca5a5}.alert-success{background-color:#ecfdf5;color:#047857;border:1px solid #6ee7b7}.loading-dots{display:flex;justify-content:center;align-items:center;gap:6px;padding:20px 0}.loading-dots span{width:10px;height:10px;background-color:var(--primary-color);border-radius:50%;display:inline-block;animation:bounce 1.4s infinite ease-in-out both}.loading-dots span:nth-child(1){animation-delay:-.32s}.loading-dots span:nth-child(2){animation-delay:-.16s}@keyframes bounce{0%,80%,to{transform:scale(0)}40%{transform:scale(1)}}