:root{--bg: #f6f6f3;--bg-deep: #eef0eb;--surface: #ffffff;--surface-2: #fbfbf8;--border: #e5e4de;--border-strong: #d7d6cf;--text: #292a25;--text-2: #6d6c65;--text-3: #a09f97;--primary: #0f766e;--primary-dark: #115e59;--primary-soft: #e5f2ef;--teal: #0f766e;--teal-soft: #e5f2ef;--amber: #96600a;--amber-soft: #fbf1d9;--danger: #c2412b;--danger-soft: #fbeae7;--success: #1f7a4d;--success-soft: #e4f2ea;--radius: 8px;--radius-sm: 6px;--shadow-sm: 0 1px 2px rgba(41, 42, 37, .05);--shadow-md: 0 1px 3px rgba(41, 42, 37, .05), 0 4px 16px rgba(41, 42, 37, .05);--shadow-lg: 0 12px 32px rgba(41, 42, 37, .1);--focus-ring: 0 0 0 3px rgba(15, 118, 110, .16);--font: "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;--font-mono: "JetBrains Mono", "Cascadia Mono", Consolas, "Courier New", 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a{color:var(--text-2);text-decoration:none}.auth-icp{text-align:center;color:var(--text-3);font-size:11px;margin-top:10px}.question-card{display:flex;flex-direction:column;gap:14px}.question-meta{display:flex;justify-content:space-between;align-items:center;gap:8px;flex-wrap:wrap}.question-stem{margin:0;font-size:15px;line-height:1.7}.option-list{display:flex;flex-direction:column;gap:8px}.option-item{display:flex;align-items:flex-start;gap:8px;padding:10px 12px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface-2);cursor:pointer;font-size:13.5px;transition:border-color .15s ease,background .15s ease}.option-item:hover{border-color:var(--border-strong)}.option-item:has(input:checked){border-color:var(--primary);background:var(--primary-soft)}.analysis-box{border-left:3px solid var(--teal);background:var(--teal-soft);padding:12px 14px;border-radius:0 var(--radius-sm) var(--radius-sm) 0;font-size:13.5px}.analysis-box p{margin:4px 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td{border-bottom:none}@media(max-width:1100px){.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:900px){.app-shell{flex-direction:column}.sidebar{width:100%;height:auto;position:static;padding:12px;gap:10px}.nav{flex-direction:row;overflow-x:auto;gap:6px;padding-bottom:4px}.nav-group{display:contents}.nav-group-label{display:none}.nav-item{white-space:nowrap;flex-shrink:0}.sidebar-footer{display:none}.main{padding:18px 16px 32px}.grid-2,.grid-3,.grid-4,.form-grid{grid-template-columns:1fr}}