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var(--border);margin-bottom:1.2rem;background:#f8fafc}.opts[data-astro-cid-utgqb6vv]{display:flex;flex-direction:column;gap:.55rem}.opt[data-astro-cid-utgqb6vv]{display:flex;align-items:center;gap:.85rem;padding:.85rem 1rem;border:1.5px solid var(--border);border-radius:10px;cursor:pointer;font-size:.93rem;font-weight:500;color:var(--text);transition:background .15s,border-color .15s,transform .1s;position:relative}.opt[data-astro-cid-utgqb6vv]:hover{background:#f0f0ff;border-color:var(--primary);transform:translate(2px)}.opt[data-astro-cid-utgqb6vv].sel{background:#ede9fe;border-color:var(--primary)}.opt[data-astro-cid-utgqb6vv].corr{background:#d1fae5;border-color:var(--success);color:#065f46}.opt[data-astro-cid-utgqb6vv].wrng{background:#fee2e2;border-color:var(--danger);color:#991b1b}.opt[data-astro-cid-utgqb6vv].lock{cursor:default;transform:none!important}.opt[data-astro-cid-utgqb6vv] input[data-astro-cid-utgqb6vv][type=radio]{position:absolute;opacity:0;pointer-events:none;width:0;height:0}.opt-idx[data-astro-cid-utgqb6vv]{flex-shrink:0;width:26px;height:26px;border-radius:6px;background:#f1f5f9;color:var(--muted);font-size:.73rem;font-weight:800;display:flex;align-items:center;justify-content:center;transition:background .15s,color .15s}.opt[data-astro-cid-utgqb6vv].sel .opt-idx[data-astro-cid-utgqb6vv]{background:var(--primary);color:#fff}.opt[data-astro-cid-utgqb6vv].corr .opt-idx[data-astro-cid-utgqb6vv]{background:var(--success);color:#fff}.opt[data-astro-cid-utgqb6vv].wrng .opt-idx[data-astro-cid-utgqb6vv]{background:var(--danger);color:#fff}.grade-btn[data-astro-cid-utgqb6vv]{margin-top:1.2rem;width:100%;padding:.9rem;background:var(--primary-g);color:#fff;border:none;border-radius:10px;font-size:.95rem;font-weight:700;cursor:pointer;transition:opacity .2s,transform .1s;letter-spacing:.01em}.grade-btn[data-astro-cid-utgqb6vv]:hover:not(:disabled){opacity:.88;transform:translateY(-1px)}.grade-btn[data-astro-cid-utgqb6vv]:disabled{cursor:default;opacity:.85}.grade-btn[data-astro-cid-utgqb6vv].btn-corr{background:linear-gradient(135deg,#10b981,#059669)}.grade-btn[data-astro-cid-utgqb6vv].btn-wrng{background:linear-gradient(135deg,#ef4444,#dc2626)}.exp-box[data-astro-cid-utgqb6vv]{margin-top:1rem;background:#f8faff;border-left:3px solid var(--primary);border-radius:0 10px 10px 0;padding:1rem 1.25rem;font-size:.875rem;color:#334155;line-height:1.75;animation:fadeSlide .3s ease}.exp-box[data-astro-cid-utgqb6vv] strong[data-astro-cid-utgqb6vv]{color:var(--primary)}@keyframes fadeSlide{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}.summary-card[data-astro-cid-utgqb6vv]{background:var(--card);border-radius:var(--radius);border:1.5px solid 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var(--border);border-radius:10px;text-decoration:none;font-size:.78rem;font-weight:600;color:var(--muted);transition:all .2s}.nav-item[data-astro-cid-utgqb6vv]:hover{border-color:var(--primary);color:var(--primary);background:#f0f0ff}.nav-item[data-astro-cid-utgqb6vv].act{background:var(--primary);border-color:var(--primary);color:#fff}.hidden[data-astro-cid-utgqb6vv]{display:none!important}