:root{--accent:#2563eb;--accent-light:#d9e6f2;--accent-dark:#1e40af;--bg:#f5f7fb;--card:#fff;--line:#d9d9d9;--line-light:#e5e7eb;--text:#1a1a1a;--muted:#7f7f7f;--warn:#b33a3a;--warn-bg:#fbe7e7;--ok:#2e7d32}*{box-sizing:border-box}html,body,#app{height:100%;margin:0}body{background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;font-family:Segoe UI,Helvetica Neue,Arial,Noto Sans,sans-serif}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.topnav{background:var(--card);border-bottom:1px solid var(--line);z-index:50;align-items:center;gap:16px;padding:10px 24px;display:flex;position:sticky;top:0}.topnav .brand{color:var(--accent-dark);font-size:16px;font-weight:700}.topnav .spacer{flex:1}.topnav .navlink{color:var(--text);border-radius:6px;padding:6px 10px;font-size:14px}.topnav .navlink:hover{background:var(--accent-light);text-decoration:none}.topnav .avatar{background:var(--accent);color:#fff;cursor:pointer;border-radius:50%;justify-content:center;align-items:center;width:34px;height:34px;font-size:13px;font-weight:600;display:flex}.container{max-width:1080px;margin:0 auto;padding:24px}.card{background:var(--card);border:1px solid var(--line-light);border-radius:12px;padding:20px;box-shadow:0 1px 2px #0000000a}.card h3{margin:0 0 12px;font-size:16px}.btn{cursor:pointer;border:1px solid #0000;border-radius:8px;justify-content:center;align-items:center;gap:6px;padding:10px 18px;font-size:14px;font-weight:600;transition:all .15s;display:inline-flex}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-dark)}.btn-outline{border-color:var(--line);color:var(--text);background:#fff}.btn-outline:hover{border-color:var(--accent);color:var(--accent)}.btn-danger{background:var(--warn);color:#fff}.btn-sm{padding:6px 12px;font-size:13px}.field{margin-bottom:14px}.field label{color:var(--muted);margin-bottom:6px;font-size:13px;display:block}.input,.select,.textarea{border:1px solid var(--line);background:#fff;border-radius:8px;outline:none;width:100%;padding:10px 12px;font-size:14px}.input:focus,.select:focus,.textarea:focus{border-color:var(--accent)}.grid{gap:16px;display:grid}.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}@media (width<=768px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}.progress{background:#e9edf3;border-radius:999px;height:10px;overflow:hidden}.progress>div{background:var(--accent);border-radius:999px;height:100%}.table{border-collapse:collapse;width:100%;font-size:14px}.table th,.table td{text-align:left;border-bottom:1px solid var(--line-light);padding:10px 12px}.table th{color:var(--muted);background:#f2f5f9;font-size:13px;font-weight:600}.table tr:hover td{background:#fafbfd}.badge{border-radius:999px;padding:3px 10px;font-size:12px;font-weight:600;display:inline-block}.badge-ok{color:var(--ok);background:#e6f4ea}.badge-warn{background:var(--warn-bg);color:var(--warn)}.badge-info{background:var(--accent-light);color:var(--accent-dark)}.warn-box{background:var(--warn-bg);color:var(--warn);border:1px solid #f0caca;border-radius:10px;padding:14px 16px;font-size:13px;line-height:1.6}.note-box{border:1px dashed var(--line);color:var(--muted);background:#f2f5f9;border-radius:10px;padding:14px 16px;font-size:13px;line-height:1.6}.auth-wrap{justify-content:center;align-items:center;min-height:100vh;padding:24px;display:flex}.auth-card{width:100%;max-width:420px}.auth-card h1{margin:0 0 4px;font-size:20px}.auth-sub{color:var(--muted);margin-bottom:20px;font-size:13px}.question-card{margin-bottom:18px}.option{border:1px solid var(--line-light);cursor:pointer;border-radius:8px;align-items:center;gap:10px;margin-bottom:8px;padding:10px 12px;display:flex}.option:hover{border-color:var(--accent)}.option.selected{border-color:var(--accent);background:var(--accent-light)}.option .opt-key{border:1px solid var(--line);border-radius:50%;justify-content:center;align-items:center;width:26px;height:26px;font-size:12px;font-weight:600;display:flex}.option.selected .opt-key{background:var(--accent);color:#fff;border-color:var(--accent)}.timer{background:var(--warn-bg);color:var(--warn);text-align:center;border-radius:10px;padding:12px 16px;font-size:20px;font-weight:700}.topic-circle{border:2px solid var(--line);width:56px;height:56px;color:var(--muted);border-radius:50%;justify-content:center;align-items:center;font-size:12px;font-weight:600;display:flex}.topic-circle.done{border-color:var(--accent);background:var(--accent-light);color:var(--accent-dark)}.muted{color:var(--muted)}.small{font-size:13px}.mt-1{margin-top:8px}.mt-2{margin-top:16px}.mt-3{margin-top:24px}.mb-1{margin-bottom:8px}.mb-2{margin-bottom:16px}.mb-3{margin-bottom:24px}.flex{align-items:center;gap:10px;display:flex}.between{justify-content:space-between}.center{text-align:center}