:root{--bg:#f3f5f9;--bg-alt:#e9edf5;--surface:#ffffff;--surface-soft:#f8fafd;--ink:#1b2233;--ink-soft:#47536b;--muted:#7e8799;--line:#e1e6f0;--line-strong:#c8d1e3;--nav-bg:#131a2b;--nav-bg-2:#0e1422;--primary:#2b5bd7;--primary-dark:#1e3fa6;--primary-soft:#e7edfb;--primary-ghost:#f4f7ff;--accent:#c98a12;--accent-soft:#faf1dc;--ok:#158a5a;--ok-soft:#e4f4ec;--bad:#cf4b3d;--bad-soft:#faecea;--shadow-xs:0 1px 2px rgba(20, 30, 60, 0.05);--shadow-sm:0 1px 2px rgba(20, 30, 60, 0.05), 0 2px 10px rgba(20, 30, 60, 0.06);--shadow-md:0 6px 20px rgba(20, 30, 60, 0.10), 0 1px 3px rgba(20, 30, 60, 0.06);--radius:10px;--radius-sm:8px;--font-sans:-apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Segoe UI", sans-serif;--font-mono:"SF Mono", "JetBrains Mono", ui-monospace, Menlo, Consolas, 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460px;min-width:0}.cert-hero__eyebrow{margin:0 0 6px;font-weight:800;font-size:.76rem;letter-spacing:.16em;color:#9db6f2}.cert-hero__title{color:#fff;font-size:clamp(1.6rem,3.6vw,2.3rem);margin:0 0 10px}.cert-hero__desc{color:#bac6e2;font-size:.99rem;margin:0 0 16px;max-width:660px}.cert-hero__meta{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:22px}.cert-hero__actions{display:flex;gap:10px;flex-wrap:wrap}.cert-hero__stats{display:flex;gap:30px;margin-left:auto}.cert-hero__stats .stat strong{font-family:var(--font-mono)}.cert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(310px,1fr));gap:18px}.cert-card{position:relative;overflow:hidden;display:flex;gap:16px;align-items:flex-start;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px;color:var(--ink);text-decoration:none;transition:border-color .16s,box-shadow .16s,transform 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8px}.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:18px}.card-grid--top{margin-top:26px}.book-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:border-color .16s,box-shadow .16s,transform .16s}.book-card:hover{transform:translateY(-2px);border-color:color-mix(in srgb,var(--book-color,#15607a) 50%,var(--line));box-shadow:var(--shadow-md)}.book-card__cover{position:relative;height:96px;display:flex;align-items:center;gap:12px;padding:0 18px;text-decoration:none;background:linear-gradient(120deg,color-mix(in srgb,var(--book-color,#15607a) 16%,#fff),#f4f7fd 60%);border-bottom:1px solid var(--line)}.book-card__cover::before{content:"";position:absolute;left:0;top:0;bottom:0;width:5px;background:var(--book-color,#15607a)}.book-card__emoji{font-size:30px}.book-card__body{padding:15px 18px 17px;display:flex;flex-direction:column;gap:6px;flex:1}.book-card__type{align-self:flex-start;font-size:.72rem;font-weight:800;color:var(--primary-dark);background:var(--primary-soft);border-radius:5px;padding:2px 8px;letter-spacing:.04em}.book-card__title{font-size:1.05rem;margin:0;line-height:1.45}.book-card__title a{color:var(--ink);text-decoration:none}.book-card__title a:hover{color:var(--primary-dark)}.book-card__desc{color:var(--ink-soft);font-size:.87rem;margin:0;flex:1}.book-card__meta{display:flex;gap:8px;font-size:.78rem;color:var(--muted);border-top:1px dashed var(--line);padding-top:9px;margin-bottom:4px}.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:16px}.feature-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow-xs);border-top:3px solid var(--primary)}.feature-card:nth-child(2){border-top-color:#4f7cf2}.feature-card:nth-child(3){border-top-color:var(--accent)}.feature-card__emoji{font-size:24px;display:inline-grid;place-items:center;width:44px;height:44px;border-radius:9px;background:var(--primary-soft)}.feature-card h3{font-size:1.05rem;margin:12px 0 6px}.feature-card p{margin:0;color:var(--ink-soft);font-size:.9rem}.link-list{display:flex;flex-direction:column;gap:10px}.link-list__item{display:flex;gap:14px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);padding:13px 16px;color:var(--ink);text-decoration:none;transition:border-color .15s,box-shadow .15s}.link-list__item:hover{border-color:var(--line-strong);box-shadow:var(--shadow-sm);text-decoration:none;color:var(--ink)}.link-list__emoji{font-size:20px;width:38px;height:38px;display:grid;place-items:center;border-radius:8px;background:var(--bg-alt);flex:none}.link-list__body{min-width:0;flex:1;display:flex;flex-direction:column}.link-list__body strong{font-size:.97rem}.link-list__body small{color:var(--muted);font-size:.82rem}.news-list{display:flex;flex-direction:column;gap:12px;margin-top:8px}.news-item{background:var(--surface);border:1px solid var(--line);border-left:3px solid var(--primary);border-radius:var(--radius-sm);padding:14px 18px}.news-item__title{font-size:1.02rem;font-weight:700;color:var(--ink)}.news-item__title:hover{color:var(--primary-dark)}.news-item__meta{color:var(--muted);font-size:.8rem;margin:3px 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li:hover{border-color:var(--line-strong);box-shadow:var(--shadow-xs)}.chapter-list__main{flex:1;display:flex;gap:14px;align-items:center;min-width:0;color:var(--ink);text-decoration:none}.chapter-list__main:hover{text-decoration:none}.chapter-list__num{flex:none;font-family:var(--font-mono);font-weight:700;color:var(--primary-dark);background:var(--primary-soft);border-radius:6px;width:38px;height:38px;display:grid;place-items:center;font-size:.82rem}.chapter-list__body{min-width:0;display:flex;flex-direction:column}.chapter-list__body strong{font-size:.98rem}.chapter-list__body small{color:var(--muted);font-size:.82rem}.chapter-list__quiz{flex:none;font-weight:700;font-size:.83rem;color:var(--ok);background:var(--ok-soft);border:1px solid color-mix(in srgb,var(--ok) 26%,#fff);border-radius:7px;padding:5px 13px;white-space:nowrap}.chapter-list__quiz:hover{text-decoration:none;color:#0d6b44;border-color:var(--ok)}.article-head{padding:6px 0 16px}.article-head__meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}.chapter-quiz{display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap;background:linear-gradient(120deg,var(--primary-soft),#f0f5ff);border:1px solid color-mix(in srgb,var(--primary) 30%,#fff);border-left:4px solid var(--primary);border-radius:var(--radius);padding:16px 20px;margin:26px 0 8px}.chapter-quiz__text{display:flex;flex-direction:column}.chapter-quiz__text strong{font-size:1rem;color:var(--primary-dark)}.chapter-quiz__text span{color:var(--ink-soft);font-size:.87rem}.story-pager{display:flex;gap:12px;margin-top:32px}.story-pager__link{flex:1;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);padding:13px 16px;color:var(--ink);text-decoration:none;display:flex;flex-direction:column;gap:3px;transition:border-color .15s,box-shadow 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