html{scroll-behavior:smooth}body{color:#18212b;background:#fff;margin:0;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.75}a{color:inherit}.container[data-astro-cid-ajkdefqr]{width:min(1180px,100% - 32px);margin:0 auto}.hero[data-astro-cid-ajkdefqr]{background:linear-gradient(#f5f8fb 0%,#fff 100%);border-bottom:1px solid #e7ebef;padding:58px 0 48px}.breadcrumb[data-astro-cid-ajkdefqr]{color:#697586;flex-wrap:wrap;gap:8px;margin-bottom:24px;font-size:14px;display:flex}.breadcrumb[data-astro-cid-ajkdefqr] a[data-astro-cid-ajkdefqr]{text-decoration:none}.category[data-astro-cid-ajkdefqr],.product-tag[data-astro-cid-ajkdefqr]{letter-spacing:.08em;color:#8b1e1e;margin-bottom:12px;font-size:12px;font-weight:800;display:inline-block}h1[data-astro-cid-ajkdefqr]{letter-spacing:-.035em;max-width:980px;margin:0;font-size:clamp(36px,5vw,60px);line-height:1.08}.hero-text[data-astro-cid-ajkdefqr]{color:#566170;max-width:850px;margin:24px 0 18px;font-size:19px}.meta[data-astro-cid-ajkdefqr]{color:#697586;gap:10px;font-size:14px;display:flex}.featured-section[data-astro-cid-ajkdefqr]{padding:34px 0 10px}figure[data-astro-cid-ajkdefqr]{margin:0}figure[data-astro-cid-ajkdefqr] img[data-astro-cid-ajkdefqr]{border-radius:18px;width:100%;height:auto;display:block;box-shadow:0 16px 45px #0f172a17}figcaption[data-astro-cid-ajkdefqr]{text-align:center;color:#697586;margin-top:10px;font-size:13px}.content-section[data-astro-cid-ajkdefqr]{padding:28px 0 80px}.article-layout[data-astro-cid-ajkdefqr]{grid-template-columns:minmax(0,1fr) 280px;align-items:start;gap:52px;display:grid}.article[data-astro-cid-ajkdefqr]{min-width:0}.article[data-astro-cid-ajkdefqr] h2[data-astro-cid-ajkdefqr]{letter-spacing:-.02em;margin:52px 0 18px;scroll-margin-top:90px;font-size:31px;line-height:1.2}.article[data-astro-cid-ajkdefqr] h3[data-astro-cid-ajkdefqr]{margin-top:28px;font-size:21px;line-height:1.35}.article[data-astro-cid-ajkdefqr] p[data-astro-cid-ajkdefqr]{color:#374151;font-size:17px}.intro-box[data-astro-cid-ajkdefqr]{background:#f6f8fa;border:1px solid #dfe5eb;border-radius:15px;margin:26px 0;padding:23px 25px}.intro-box[data-astro-cid-ajkdefqr] p[data-astro-cid-ajkdefqr]{margin-bottom:10px}.toc[data-astro-cid-ajkdefqr]{background:#fff;border:1px solid #e2e7ec;border-radius:16px;margin:32px 0;padding:24px}.toc[data-astro-cid-ajkdefqr] h2[data-astro-cid-ajkdefqr]{margin:0 0 14px;font-size:21px}.toc[data-astro-cid-ajkdefqr] ol[data-astro-cid-ajkdefqr]{margin:0;padding-left:22px}.toc[data-astro-cid-ajkdefqr] li[data-astro-cid-ajkdefqr]{margin:7px 0}.toc[data-astro-cid-ajkdefqr] a[data-astro-cid-ajkdefqr]{color:#8b1e1e;text-decoration:none}.stats-grid[data-astro-cid-ajkdefqr]{grid-template-columns:repeat(4,1fr);gap:14px;margin:28px 0;display:grid}.stat-card[data-astro-cid-ajkdefqr]{text-align:center;background:#fff;border:1px solid #e2e7ec;border-radius:14px;padding:20px 12px}.stat-card[data-astro-cid-ajkdefqr] strong[data-astro-cid-ajkdefqr]{font-size:30px;line-height:1.1;display:block}.stat-card[data-astro-cid-ajkdefqr] span[data-astro-cid-ajkdefqr]{color:#697586;margin-top:6px;font-size:13px;display:block}.note[data-astro-cid-ajkdefqr],.callout[data-astro-cid-ajkdefqr]{background:#f7f9fb;border:1px solid #e0e6ec;border-radius:14px;margin:28px 0;padding:22px 24px}.pyq-card[data-astro-cid-ajkdefqr]{background:#fff;border:1px solid #e1e6eb;border-radius:15px;margin:20px 0;padding:23px 24px;box-shadow:0 8px 28px #0f172a0b}.pyq-card[data-astro-cid-ajkdefqr].highlight{border-left:5px solid #8b1e1e}.pyq-card[data-astro-cid-ajkdefqr] .year[data-astro-cid-ajkdefqr]{color:#8b1e1e;letter-spacing:.07em;text-transform:uppercase;font-size:12px;font-weight:800;display:block}.pyq-card[data-astro-cid-ajkdefqr] h3[data-astro-cid-ajkdefqr],.pyq-card[data-astro-cid-ajkdefqr] p[data-astro-cid-ajkdefqr]{margin:8px 0}.answer[data-astro-cid-ajkdefqr]{color:#1f6b3a!important}.topic-grid[data-astro-cid-ajkdefqr]{grid-template-columns:repeat(2,1fr);gap:15px;margin:26px 0;display:grid}.topic-grid[data-astro-cid-ajkdefqr]>div[data-astro-cid-ajkdefqr]{border:1px solid #e2e7ec;border-radius:14px;padding:21px}.topic-grid[data-astro-cid-ajkdefqr] strong[data-astro-cid-ajkdefqr]{font-size:18px;display:block}.topic-grid[data-astro-cid-ajkdefqr] p[data-astro-cid-ajkdefqr]{margin:8px 0 0;font-size:15px}.check-list[data-astro-cid-ajkdefqr]{padding-left:22px}.check-list[data-astro-cid-ajkdefqr] li[data-astro-cid-ajkdefqr]{margin:9px 0}.progression[data-astro-cid-ajkdefqr]{grid-template-columns:repeat(3,1fr);gap:12px;margin:25px 0;display:grid}.progression[data-astro-cid-ajkdefqr]>div[data-astro-cid-ajkdefqr]{background:#fafbfc;border:1px solid #e1e6eb;border-radius:14px;padding:20px}.progression[data-astro-cid-ajkdefqr] strong[data-astro-cid-ajkdefqr]{color:#8b1e1e;font-size:24px;display:block}.progression[data-astro-cid-ajkdefqr] span[data-astro-cid-ajkdefqr]{margin-top:6px;font-size:14px;display:block}.depth-box[data-astro-cid-ajkdefqr]{grid-template-columns:repeat(4,1fr);gap:12px;margin:28px 0;display:grid}.depth-box[data-astro-cid-ajkdefqr]>div[data-astro-cid-ajkdefqr]{border:1px solid #e1e6eb;border-radius:14px;padding:19px}.depth-box[data-astro-cid-ajkdefqr] strong[data-astro-cid-ajkdefqr],.depth-box[data-astro-cid-ajkdefqr] span[data-astro-cid-ajkdefqr]{display:block}.depth-box[data-astro-cid-ajkdefqr] strong[data-astro-cid-ajkdefqr]{color:#8b1e1e}.depth-box[data-astro-cid-ajkdefqr] span[data-astro-cid-ajkdefqr]{margin-top:5px;font-weight:800}.depth-box[data-astro-cid-ajkdefqr] p[data-astro-cid-ajkdefqr]{margin:7px 0 0;font-size:14px}.command-grid[data-astro-cid-ajkdefqr]{grid-template-columns:repeat(2,1fr);gap:13px;margin:26px 0;display:grid}.command-grid[data-astro-cid-ajkdefqr]>div[data-astro-cid-ajkdefqr]{border:1px solid #e1e6eb;border-radius:14px;padding:19px}.command-grid[data-astro-cid-ajkdefqr] strong[data-astro-cid-ajkdefqr]{font-size:18px}.command-grid[data-astro-cid-ajkdefqr] p[data-astro-cid-ajkdefqr]{margin:6px 0 0;font-size:15px}.steps[data-astro-cid-ajkdefqr]{padding-left:23px}.steps[data-astro-cid-ajkdefqr] li[data-astro-cid-ajkdefqr]{margin:12px 0;padding-left:3px}.product-card[data-astro-cid-ajkdefqr]{border:1px solid #dfe5ea;border-radius:20px;grid-template-columns:minmax(0,1fr) 180px;align-items:center;gap:28px;margin:42px 0;padding:30px;display:grid}.mains-book[data-astro-cid-ajkdefqr]{background:#f7f8fa}.prelims-book[data-astro-cid-ajkdefqr]{background:#fafafa;display:block}.product-card[data-astro-cid-ajkdefqr] h2[data-astro-cid-ajkdefqr]{margin-top:0}.product-card[data-astro-cid-ajkdefqr] img[data-astro-cid-ajkdefqr]{border-radius:8px;width:100%;height:auto}.product-card[data-astro-cid-ajkdefqr] ul[data-astro-cid-ajkdefqr]{padding-left:20px}.price[data-astro-cid-ajkdefqr]{margin:15px 0;font-size:27px;font-weight:900}.btn[data-astro-cid-ajkdefqr]{border-radius:10px;justify-content:center;align-items:center;padding:13px 20px;font-weight:800;text-decoration:none;transition:transform .15s;display:inline-flex}.btn[data-astro-cid-ajkdefqr]:hover{transform:translateY(-1px)}.btn-primary[data-astro-cid-ajkdefqr]{color:#fff;background:#8b1e1e}.btn-secondary[data-astro-cid-ajkdefqr]{color:#fff;background:#18212b}.btn-outline[data-astro-cid-ajkdefqr]{color:#8b1e1e;border:1px solid #8b1e1e}.btn-light[data-astro-cid-ajkdefqr]{color:#18212b;background:#fff}.mock-card[data-astro-cid-ajkdefqr]{color:#fff;background:#18212b;border-radius:20px;margin:42px 0;padding:32px}.mock-card[data-astro-cid-ajkdefqr] h2[data-astro-cid-ajkdefqr]{margin-top:0}.mock-card[data-astro-cid-ajkdefqr] p[data-astro-cid-ajkdefqr]{color:#d5dbe1}.mock-card[data-astro-cid-ajkdefqr] .product-tag[data-astro-cid-ajkdefqr]{color:#fff}.revision-list[data-astro-cid-ajkdefqr]{gap:12px;margin:25px 0;display:grid}.revision-list[data-astro-cid-ajkdefqr]>div[data-astro-cid-ajkdefqr]{border:1px solid #e1e6eb;border-radius:13px;grid-template-columns:170px 1fr;gap:15px;padding:17px;display:grid}.revision-list[data-astro-cid-ajkdefqr] strong[data-astro-cid-ajkdefqr]{color:#8b1e1e}.revision-list[data-astro-cid-ajkdefqr] span[data-astro-cid-ajkdefqr]{color:#4b5563}.related-grid[data-astro-cid-ajkdefqr]{grid-template-columns:repeat(2,1fr);gap:15px;display:grid}.related-card[data-astro-cid-ajkdefqr]{border:1px solid #e1e6eb;border-radius:15px;padding:20px;text-decoration:none;display:block}.related-card[data-astro-cid-ajkdefqr] span[data-astro-cid-ajkdefqr]{color:#8b1e1e;font-size:11px;font-weight:900}.related-card[data-astro-cid-ajkdefqr] h3[data-astro-cid-ajkdefqr]{margin:8px 0;font-size:18px}.related-card[data-astro-cid-ajkdefqr] p[data-astro-cid-ajkdefqr]{margin:0;font-size:14px}.faq[data-astro-cid-ajkdefqr]{margin-top:20px}details[data-astro-cid-ajkdefqr]{border-bottom:1px solid #e1e6eb;padding:18px 0}summary[data-astro-cid-ajkdefqr]{cursor:pointer;font-weight:800}.final-cta[data-astro-cid-ajkdefqr]{text-align:center;background:#f5f7f9;border-radius:20px;margin-top:55px;padding:38px}.final-cta[data-astro-cid-ajkdefqr] h2[data-astro-cid-ajkdefqr]{margin-top:5px}.final-buttons[data-astro-cid-ajkdefqr]{flex-wrap:wrap;justify-content:center;gap:10px;margin-top:24px;display:flex}.sidebar[data-astro-cid-ajkdefqr]{position:sticky;top:90px}.sidebar-card[data-astro-cid-ajkdefqr]{background:#fff;border:1px solid #e1e6eb;border-radius:15px;margin-bottom:15px;padding:21px}.sidebar-card[data-astro-cid-ajkdefqr] h3[data-astro-cid-ajkdefqr]{margin-top:0}.sidebar-card[data-astro-cid-ajkdefqr]>a[data-astro-cid-ajkdefqr]:not(.small-btn){color:#536070;padding:7px 0;font-size:14px;text-decoration:none;display:block}.book-sidebar[data-astro-cid-ajkdefqr]{background:#f7f8fa}.book-sidebar[data-astro-cid-ajkdefqr] strong[data-astro-cid-ajkdefqr]{margin:10px 0;font-size:24px;display:block}.small-btn[data-astro-cid-ajkdefqr]{color:#fff;background:#8b1e1e;border-radius:8px;padding:9px 13px;font-size:13px;font-weight:800;text-decoration:none;display:inline-block}@media (width<=900px){.article-layout[data-astro-cid-ajkdefqr]{grid-template-columns:1fr}.sidebar[data-astro-cid-ajkdefqr]{position:static}.stats-grid[data-astro-cid-ajkdefqr],.depth-box[data-astro-cid-ajkdefqr]{grid-template-columns:repeat(2,1fr)}.progression[data-astro-cid-ajkdefqr]{grid-template-columns:1fr}}@media (width<=650px){.hero[data-astro-cid-ajkdefqr]{padding:38px 0 32px}h1[data-astro-cid-ajkdefqr]{font-size:35px}.hero-text[data-astro-cid-ajkdefqr]{font-size:17px}.stats-grid[data-astro-cid-ajkdefqr],.topic-grid[data-astro-cid-ajkdefqr],.command-grid[data-astro-cid-ajkdefqr],.related-grid[data-astro-cid-ajkdefqr],.depth-box[data-astro-cid-ajkdefqr],.revision-list[data-astro-cid-ajkdefqr]>div[data-astro-cid-ajkdefqr],.product-card[data-astro-cid-ajkdefqr]{grid-template-columns:1fr}.product-card[data-astro-cid-ajkdefqr] img[data-astro-cid-ajkdefqr]{max-width:190px}.article[data-astro-cid-ajkdefqr] h2[data-astro-cid-ajkdefqr]{font-size:27px}.final-cta[data-astro-cid-ajkdefqr]{padding:27px 20px}.final-buttons[data-astro-cid-ajkdefqr]{flex-direction:column}.final-buttons[data-astro-cid-ajkdefqr] .btn[data-astro-cid-ajkdefqr]{box-sizing:border-box;width:100%}}