.app-loading{display:flex;align-items:center;justify-content:center;min-height:100vh;color:#6b7280;font-size:14px}:root{--primary: #0071e3;--primary-weak: #e8f2ff;--danger: #e5484d;--success: #2fa84f;--warning: #f5a623;--text: #1d1d1f;--text-2: #6e6e73;--bg: #f5f5f7;--card: #ffffff;--border: #e5e5ea;--radius: 12px;--shadow: 0 1px 3px rgba(0, 0, 0, .06)}*{box-sizing:border-box;margin:0;padding:0}html,body{font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Segoe UI,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);font-size:14px;line-height:1.6}a{color:var(--primary);text-decoration:none}button{font-family:inherit;cursor:pointer}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:none;border-radius:8px;padding:9px 18px;font-size:14px;background:var(--primary);color:#fff;transition:opacity .15s}.btn:hover{opacity:.88}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-secondary{background:#f0f0f2;color:var(--text)}.btn-secondary:hover{background:#e5e5ea;opacity:1}.btn-danger{background:var(--danger)}.btn-ghost{background:transparent;color:var(--primary);border:1px solid var(--primary)}.btn-ghost:hover{background:var(--primary-weak);opacity:1}.input,.select,.textarea{width:100%;border:1px solid var(--border);border-radius:8px;padding:9px 12px;font-size:14px;font-family:inherit;background:#fff;color:var(--text);outline:none}.input:focus,.select:focus,.textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px #0071e31f}.textarea{resize:vertical;min-height:80px}.field{margin-bottom:14px}.field label{display:block;font-size:13px;color:var(--text-2);margin-bottom:6px;font-weight:500}.tag{display:inline-block;font-size:12px;padding:2px 10px;border-radius:999px;background:var(--primary-weak);color:var(--primary);font-weight:500}.tag-success{background:#e6f6ec;color:var(--success)}.tag-warning{background:#fdf3e0;color:#b26a00}.tag-danger{background:#fdecec;color:var(--danger)}.tag-gray{background:#f0f0f2;color:var(--text-2)}.table{width:100%;border-collapse:collapse;background:#fff;border-radius:var(--radius);overflow:hidden}.table th{text-align:left;font-size:12px;color:var(--text-2);font-weight:600;padding:12px 14px;border-bottom:1px solid var(--border);background:#fafafa;white-space:nowrap}.table td{padding:12px 14px;border-bottom:1px solid var(--border);font-size:13.5px;vertical-align:middle}.table tr:last-child td{border-bottom:none}.table tr:hover td{background:#fafafa}.empty{text-align:center;color:var(--text-2);padding:48px 20px;font-size:13px}.muted{color:var(--text-2);font-size:12.5px}.flex{display:flex;align-items:center;gap:10px}.flex-between{display:flex;align-items:center;justify-content:space-between;gap:10px}.grow{flex:1}.mt-8{margin-top:8px}.mt-16{margin-top:16px}.mb-16{margin-bottom:16px}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:16px}@media (max-width: 720px){.grid-2{grid-template-columns:1fr}}h1{font-size:22px;font-weight:700}h2{font-size:17px;font-weight:600}.page-title{font-size:20px;font-weight:700;margin-bottom:4px}.page-sub{color:var(--text-2);font-size:13px;margin-bottom:18px}.option-item{display:flex;align-items:flex-start;gap:10px;padding:12px 14px;border:1px solid var(--border);border-radius:10px;margin-bottom:10px;cursor:pointer;background:#fff;transition:border-color .15s,background .15s;-webkit-user-select:none;user-select:none}.option-item:hover{border-color:var(--primary)}.option-item.selected{border-color:var(--primary);background:#0071e31a;border-left:4px solid var(--primary);padding-left:11px;box-shadow:0 2px 8px #0071e31f;font-weight:500}.option-item.correct{border-color:var(--success);background:#e6f6ec;border-left:4px solid var(--success);padding-left:11px}.option-item.wrong{border-color:var(--danger);background:#fdecec;border-left:4px solid var(--danger);padding-left:11px}.option-key{flex:0 0 26px;height:26px;border-radius:8px;background:#f0f0f2;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:600}.option-item.selected .option-key{background:var(--primary);color:#fff}.option-item.correct .option-key{background:var(--success);color:#fff}.option-item.wrong .option-key{background:var(--danger);color:#fff}.loading-box,.error-box{text-align:center;padding:60px 20px;color:var(--text-2);font-size:13px}.error-box{color:var(--danger)}.toast-wrap{position:fixed;top:20px;left:50%;transform:translate(-50%);z-index:9999;display:flex;flex-direction:column;gap:8px;align-items:center}.toast{background:#1d1d1feb;color:#fff;padding:9px 18px;border-radius:999px;font-size:13px;box-shadow:0 4px 16px #0000002e;animation:toastIn .25s ease}.toast.success{background:#2fa84ff2}.toast.error{background:#e5484df2}@keyframes toastIn{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}