:root{--text:#6b6375;--text-h:#08060d;--bg:#fff;--border:#e5e4e7;--code-bg:#f4f3ec;--accent:#aa3bff;--accent-bg:#aa3bff1a;--accent-border:#aa3bff80;--social-bg:#f4f3ec80;--shadow:#0000001a 0 10px 15px -3px, #0000000d 0 4px 6px -2px;--page-bg:#f0f2f5;--card-bg:#ebf3fb;--tab-active-text:#0366d6;--tab-text:#555;--sans:system-ui, "Segoe UI", Roboto, sans-serif;--heading:system-ui, "Segoe UI", Roboto, sans-serif;--mono:ui-monospace, Consolas, monospace;font:18px/145% var(--sans);letter-spacing:.18px;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;color:var(--text);background:var(--bg);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial}}@media (width<=1024px){:root{font-size:16px}}@media 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#0000000f}}.db-history-nav-btn:hover:not(:disabled){background:var(--accent-bg);border-color:var(--accent-border);color:var(--accent)}.db-history-nav-btn:disabled{cursor:not-allowed;opacity:.25}.db-history-nav-label{color:var(--text-h);text-align:center;min-width:80px;font-size:.95rem;font-weight:600}.db-view-tabs{border-bottom:2px solid var(--border);gap:12px;width:100%;max-width:1000px;margin:32px auto 16px;padding-bottom:8px;display:flex}.db-view-tab{color:var(--text);cursor:pointer;background:0 0;border:none;border-radius:8px 8px 0 0;align-items:center;gap:8px;padding:8px 20px;font-size:1.1rem;font-weight:600;transition:all 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#00000005}.db-mistakes-title{color:var(--text-h);margin:0!important;font-size:1.2rem!important}.db-mistakes-sub{color:var(--text);margin:0 0 12px;font-size:.85rem}.db-quick-review-btn{background:var(--accent);color:#fff;border:none;border-bottom:3px solid var(--accent-border);cursor:pointer;border-radius:10px;justify-content:center;align-items:center;padding:10px 16px;font-size:.9rem;font-weight:600;transition:all .2s;display:flex}.db-quick-review-btn:hover{filter:brightness(1.08);transform:translateY(-1px)}.db-mistakes-nav{flex-direction:column;gap:16px;display:flex}.db-mistakes-book-tabs{background:var(--card-bg);border:1px solid var(--border);border-radius:12px;flex-direction:column;gap:6px;padding:8px;display:flex}.db-mistakes-book-tab{text-align:left;color:var(--text);cursor:pointer;background:0 0;border:none;border-radius:8px;justify-content:space-between;align-items:center;gap:10px;padding:10px 12px;font-size:.88rem;font-weight:500;transition:all 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