*{box-sizing:border-box;margin:0;padding:0}:root{--bg:#0f1117;--card:#1a1d2e;--accent:#6c63ff;--accent2:#ff6584;--text:#e8e8f0;--muted:#88a;--success:#4ade80;--error:#f87171;--warning:#fbbf24;--border:#2a2d3e;--radius:14px;--nav-h:68px;--top-h:52px}body{background:#0f1117;background:var(--bg);color:#e8e8f0;color:var(--text);font-family:Segoe UI,system-ui,sans-serif;overscroll-behavior:none}.App,body{min-height:100vh}.App{display:flex;flex-direction:column}.top-bar{align-items:center;background:#1a1d2e;background:var(--card);border-bottom:1px solid #2a2d3e;border-bottom:1px solid var(--border);display:flex;height:52px;height:var(--top-h);justify-content:space-between;left:0;padding:0 20px;position:fixed;right:0;top:0;z-index:200}.top-bar-logo{color:#e8e8f0;color:var(--text);font-size:16px;font-weight:800}.btn-logout{background:#0000;border:1px solid #2a2d3e;border:1px solid var(--border);border-radius:8px;color:#88a;color:var(--muted);cursor:pointer;font-family:inherit;font-size:13px;padding:5px 14px;transition:all .2s}.btn-logout:hover{border-color:#f87171;border-color:var(--error);color:#f87171;color:var(--error)}.page-content{align-items:flex-start;display:flex;flex:1 1;justify-content:center;min-height:100vh;padding:72px 16px 88px;padding:calc(var(--top-h) + 20px) 16px calc(var(--nav-h) + 20px)}.bottom-nav{background:#1a1d2e;background:var(--card);border-top:1px solid #2a2d3e;border-top:1px solid var(--border);bottom:0;height:68px;height:var(--nav-h);justify-content:space-around;left:0;padding-bottom:env(safe-area-inset-bottom,0);position:fixed;right:0;z-index:200}.bottom-nav,.bottom-nav-btn{align-items:center;display:flex}.bottom-nav-btn{-webkit-tap-highlight-color:transparent;background:none;border:none;color:#88a;color:var(--muted);cursor:pointer;flex:1 1;flex-direction:column;font-family:inherit;gap:4px;justify-content:center;padding:8px 0;position:relative;transition:all .2s}.bottom-nav-btn:hover{color:#e8e8f0;color:var(--text)}.bottom-nav-btn.active{color:#6c63ff;color:var(--accent)}.bottom-nav-icon{align-items:center;display:flex;justify-content:center;transition:transform .2s}.bottom-nav-btn.active .bottom-nav-icon{transform:translateY(-2px)}.bottom-nav-label{font-size:11px;font-weight:600;letter-spacing:.02em}.bottom-nav-dot{animation:dotPop .3s ease;background:#6c63ff;background:var(--accent);border-radius:50%;height:4px;left:50%;position:absolute;top:6px;transform:translateX(-50%);width:4px}@keyframes dotPop{0%{opacity:0;transform:translateX(-50%) scale(0)}to{opacity:1;transform:translateX(-50%) scale(1)}}.role-card{background:#1a1d2e;background:var(--card);border:2px solid #2a2d3e;border:2px solid var(--border);border-radius:20px;cursor:pointer;overflow:hidden;padding:32px 28px;position:relative;transition:all .25s ease;width:300px}.role-card:before{background:var(--role-color);content:"";height:4px;left:0;position:absolute;right:0;top:0}.role-card:hover{border-color:var(--role-color);box-shadow:0 16px 48px var(--role-glow);transform:translateY(-6px)}.role-card-icon{font-size:52px;margin-bottom:16px}.role-card-title{font-size:22px;font-weight:800;margin-bottom:10px}.role-card-desc{color:#88a;color:var(--muted);font-size:14px;line-height:1.6;margin-bottom:20px}.role-card-features{display:flex;flex-direction:column;gap:8px;list-style:none;margin-bottom:24px}.role-card-features li{color:#e8e8f0;color:var(--text);font-size:13px}.role-card-btn{border:none;border-radius:10px;cursor:pointer;font-family:inherit;font-size:15px;font-weight:700;padding:12px;transition:all .2s;width:100%}.student-btn{background:#ff6584;background:var(--accent2);color:#fff}.student-btn:hover{background:#e5506e;transform:translateY(-1px)}.teacher-btn{background:#6c63ff;background:var(--accent);color:#fff}.teacher-btn:hover{background:#5a52e0;transform:translateY(-1px)}.card{background:#1a1d2e;background:var(--card);border:1px solid #2a2d3e;border:1px solid var(--border);border-radius:14px;border-radius:var(--radius);box-shadow:0 8px 40px #6c63ff1a;max-width:640px;padding:28px;width:100%}.btn{border:none;border-radius:10px;cursor:pointer;display:inline-block;font-family:inherit;font-size:15px;font-weight:600;padding:12px 28px;transition:all .2s ease}.btn-primary{background:#6c63ff;background:var(--accent);color:#fff}.btn-primary:hover{background:#5a52e0;transform:translateY(-2px)}.btn-secondary{background:#0000;border:2px solid #6c63ff;border:2px solid var(--accent);color:#6c63ff;color:var(--accent)}.btn-secondary:hover{background:#6c63ff;background:var(--accent);color:#fff}.btn-outline{background:#0000;border:2px solid #2a2d3e;border:2px solid var(--border);color:#88a;color:var(--muted)}.btn-outline:hover{border-color:#88a;border-color:var(--muted);color:#e8e8f0;color:var(--text)}.btn:disabled{cursor:not-allowed;opacity:.4;transform:none!important}.input{background:#0f1117;background:var(--bg);border:2px solid #2a2d3e;border:2px solid var(--border);border-radius:10px;color:#e8e8f0;color:var(--text);font-family:inherit;font-size:15px;outline:none;padding:12px 16px;transition:border-color .2s;width:100%}.input:focus{border-color:#6c63ff;border-color:var(--accent)}.input::placeholder{color:#88a;color:var(--muted)}.progress-container{background:#2a2d3e;background:var(--border);border-radius:99px;height:8px;margin-bottom:20px;overflow:hidden}.progress-fill{background:linear-gradient(90deg,#6c63ff,#ff6584);background:linear-gradient(90deg,var(--accent),var(--accent2));border-radius:99px;height:100%;transition:width .4s ease}.timer{font-feature-settings:"tnum";align-items:center;display:flex;font-size:17px;font-variant-numeric:tabular-nums;font-weight:700;gap:6px}.timer-ok{color:#4ade80;color:var(--success)}.timer-warning{color:#fbbf24;color:var(--warning)}.timer-urgent{animation:pulse .5s infinite alternate;color:#f87171;color:var(--error)}@keyframes pulse{0%{opacity:1}to{opacity:.4}}.badge{border-radius:99px;display:inline-block;font-size:12px;font-weight:700;letter-spacing:.04em;padding:3px 11px;text-transform:uppercase}.badge-easy{background:#164430;color:#4ade80}.badge-medium{background:#3b2c0a;color:#fbbf24}.badge-hard{background:#3b0a0a;color:#f87171}.alert{border-radius:10px;font-size:14px;line-height:1.5;margin-bottom:14px;padding:12px 16px}.alert-error{background:#f871711a;border:1px solid #f87171;border:1px solid var(--error);color:#f87171;color:var(--error)}.alert-success{background:#4ade801a;border:1px solid #4ade80;border:1px solid var(--success);color:#4ade80;color:var(--success)}.alert-info{background:#6c63ff1a;border:1px solid #6c63ff;border:1px solid var(--accent);color:#6c63ff;color:var(--accent)}.stat-grid{grid-gap:12px;display:grid;gap:12px;grid-template-columns:repeat(3,1fr);margin-bottom:24px}.stat-card{background:#0f1117;background:var(--bg);border:1px solid #2a2d3e;border:1px solid var(--border);border-radius:12px;padding:16px;text-align:center}.stat-value{color:#6c63ff;color:var(--accent);font-size:24px;font-weight:800}.stat-label{color:#88a;color:var(--muted);font-size:12px;margin-top:4px}.lb-table{border-collapse:collapse;width:100%}.lb-table th{color:#88a;color:var(--muted);font-size:12px;letter-spacing:.05em;padding:8px 12px;text-align:left;text-transform:uppercase}.lb-table td,.lb-table th{border-bottom:1px solid #2a2d3e;border-bottom:1px solid var(--border)}.lb-table td{font-size:14px;padding:12px}.lb-table tr:last-child td{border-bottom:none}.lb-table tr.current-user td{background:#6c63ff14}.section-title{color:#88a;color:var(--muted);font-size:13px;font-weight:700;letter-spacing:.06em;margin-bottom:12px;text-transform:uppercase}@keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}
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