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16px}.sg-callout-tip{border-left-color:var(--callout-tip);background:var(--callout-tip-bg)}.sg-callout-title{text-transform:uppercase;letter-spacing:.08em;color:var(--callout-tip);margin:0 0 4px;font-size:12px;font-weight:700}.sg-callout p{margin:4px 0}.sg-source-ref{color:var(--text-faint);margin-top:24px;font-size:12px;font-style:italic}.sg-placeholder,.sg-loading{text-align:center;color:var(--text-muted);padding:40px 20px}.sg-placeholder h2{color:var(--text-body);margin-bottom:12px}.sg-placeholder-note{max-width:480px;margin:0 auto}@media (width<=720px){.study-guide{padding:0 12px 40px}.sg-article h1{font-size:24px}}.error-boundary{box-sizing:border-box;justify-content:center;align-items:center;min-height:100vh;padding:24px;display:flex}.error-boundary-card{background:var(--bg-surface);border:1px solid var(--border-default);text-align:center;border-radius:10px;width:100%;max-width:480px;padding:28px}.error-boundary-card h1{margin:0 0 12px;font-size:22px}.error-boundary-card p{color:var(--text-mid);margin:0 0 20px;line-height:1.5}.error-boundary-card a{color:var(--text-link)}.admin-view{text-align:left;max-width:900px;margin:0 auto;padding:32px 20px 80px;line-height:1.5}.admin-header h1{margin:0 0 8px;font-size:26px}.admin-meta{color:var(--text-mid);margin:0 0 24px;font-size:14px}.admin-toc{background:var(--bg-sunk);border:1px solid var(--border-subtle);border-radius:8px;margin:0 0 32px;padding:16px 20px}.admin-toc ol{columns:2;column-gap:24px;margin:0;padding-left:20px}@media (width<=600px){.admin-toc ol{columns:1}}.admin-toc li{break-inside:avoid;margin:4px 0}.admin-toc a{color:var(--text-link);text-decoration:none}.admin-toc a:hover{text-decoration:underline}.admin-toc-count{color:var(--text-muted);font-size:13px}.admin-topic{margin:0 0 40px;scroll-margin-top:16px}.admin-topic h2{border-bottom:1px solid var(--border-subtle);margin:0 0 16px;padding-bottom:8px;font-size:20px}.admin-question{background:var(--bg-sunk);border:1px solid var(--border-subtle);border-radius:8px;margin:0 0 14px;padding:16px 18px}.admin-q-head{align-items:baseline;gap:10px;margin:0 0 10px;display:flex}.admin-q-id{color:var(--text-muted);font-variant-numeric:tabular-nums;flex-shrink:0;font-size:13px}.admin-q-text{color:var(--text-link);margin:0;font-weight:600}.admin-options{margin:0 0 12px;padding:0;list-style:none}.admin-option{color:var(--text-body);border-radius:4px;align-items:flex-start;gap:8px;padding:6px 8px;display:flex}.admin-option-correct{background:var(--success-bg);color:var(--text-primary)}.admin-option-wrong{background:var(--danger-bg-soft)}.admin-correct-tag{color:var(--success);flex-shrink:0;font-family:ui-monospace,monospace;font-weight:700}.admin-wrong-tag{color:var(--danger);flex-shrink:0;font-family:ui-monospace,monospace;font-weight:700}.admin-explanation{background:var(--bg-app);border-left:2px solid var(--accent);color:var(--text-body);margin:8px 0 0;padding:10px 12px;font-size:14px}.admin-en{border-top:1px dashed var(--border-subtle);margin-top:12px;padding-top:10px}.admin-en summary{cursor:pointer;color:var(--text-muted);-webkit-user-select:none;user-select:none;font-size:13px}.admin-en summary:hover{color:var(--text-body)}.admin-en[open] summary{margin-bottom:8px}