.ckkb-shell{--kb-bg:#f5f7fb;--kb-card:#fff;--kb-ink:#18212f;--kb-muted:#657187;--kb-line:#e3e8f0;--kb-accent:#3157d5;--kb-accent2:#6d48d7;max-width:1240px;margin:0 auto;color:var(--kb-ink);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}.ckkb-page{padding:28px 22px 64px}.ckkb-hero{margin:24px 0 46px;border-radius:28px;overflow:hidden;background:linear-gradient(135deg,#101c3a 0%,#243f83 55%,#6d48d7 100%);box-shadow:0 20px 50px rgba(31,48,95,.22)}.ckkb-hero-inner{padding:72px 48px;text-align:center;color:#fff}.ckkb-eyebrow{font-size:.76rem;font-weight:800;letter-spacing:.16em;text-transform:uppercase;opacity:.78}.ckkb-hero h1,.ckkb-category-hero h1,.ckkb-single-header h1{font-size:clamp(2.2rem,5vw,4.3rem);line-height:1.02;margin:.4rem 0 1rem;letter-spacing:-.045em}.ckkb-hero p{font-size:1.12rem;max-width:740px;margin:0 auto 28px;opacity:.9}.ckkb-search{max-width:760px;margin:0 auto;display:flex;background:#fff;padding:7px;border-radius:16px;box-shadow:0 12px 34px rgba(0,0,0,.18)}.ckkb-search input{flex:1;min-width:0;border:0!important;box-shadow:none!important;padding:15px 16px!important;font-size:1rem;color:#1d2736;background:transparent}.ckkb-search button,.ckkb-button{border:0;border-radius:11px;background:#3157d5;color:#fff;padding:13px 22px;font-weight:750;text-decoration:none;cursor:pointer}.ckkb-section{padding:0 8px 44px}.ckkb-section-heading{display:flex;align-items:end;justify-content:space-between;margin-bottom:22px}.ckkb-section-heading h2{font-size:2rem;margin:.25rem 0 0}.ckkb-category-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.ckkb-category-card{position:relative;display:flex;gap:18px;min-height:230px;padding:28px;border:1px solid var(--kb-line);border-radius:22px;background:var(--kb-card);color:var(--kb-ink);text-decoration:none!important;box-shadow:0 8px 24px rgba(28,41,65,.06);transition:.2s ease}.ckkb-category-card:hover{transform:translateY(-4px);box-shadow:0 18px 40px rgba(28,41,65,.12);border-color:#bac6ef}.ckkb-category-icon{width:58px;height:58px;flex:0 0 58px;border-radius:16px;display:grid;place-items:center;background:#eef2ff;color:#3157d5;font-size:2rem;font-weight:700}.ckkb-category-card h3{margin:3px 0 10px;font-size:1.35rem}.ckkb-category-card p{color:var(--kb-muted);font-size:.96rem;line-height:1.6;margin:0 0 18px}.ckkb-count{font-size:.84rem;font-weight:750;color:#3157d5}.ckkb-arrow{position:absolute;right:24px;bottom:23px;font-size:1.35rem;color:#6d48d7}.ckkb-category-hero,.ckkb-single-header{border-radius:24px;background:linear-gradient(180deg,#f5f7ff 0%,#fff 100%);border:1px solid #e0e6f5;padding:46px;margin-bottom:32px}.ckkb-category-hero p,.ckkb-single-header p{max-width:800px;color:var(--kb-muted);font-size:1.08rem;line-height:1.7}.ckkb-category-hero h1,.ckkb-single-header h1{font-size:clamp(2.2rem,4vw,3.7rem)}.ckkb-hero-count{display:inline-flex;padding:8px 12px;border-radius:999px;background:#ebeefe;color:#3157d5;font-weight:750;font-size:.86rem}.ckkb-breadcrumb{display:flex;gap:9px;align-items:center;flex-wrap:wrap;font-size:.86rem;color:#7a8495;margin:0 0 24px}.ckkb-breadcrumb a{color:#3157d5;text-decoration:none}.ckkb-article-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.ckkb-article-card{display:flex;flex-direction:column;padding:26px;border-radius:18px;border:1px solid var(--kb-line);background:#fff;box-shadow:0 6px 18px rgba(28,41,65,.04)}.ckkb-article-card h2{font-size:1.22rem;line-height:1.35;margin:12px 0 8px}.ckkb-article-card h2 a{color:var(--kb-ink);text-decoration:none}.ckkb-article-card p{color:var(--kb-muted);line-height:1.6;margin:0 0 18px}.ckkb-card-top{display:flex;gap:10px;align-items:center;font-size:.78rem}.ckkb-mini-pill{background:#eef2ff;color:#3157d5;border-radius:999px;padding:5px 9px;font-weight:750}.ckkb-mini-time{color:#788397}.ckkb-read{margin-top:auto;color:#3157d5;text-decoration:none;font-weight:750}.ckkb-single-wrap{max-width:900px;margin:0 auto}.ckkb-single-content{font-size:1.04rem;line-height:1.75}.ckkb-single-content h2{font-size:1.7rem;margin:44px 0 16px;scroll-margin-top:100px}.ckkb-single-content h3{font-size:1.12rem;margin:.1rem 0 .5rem}.ckkb-lead{font-size:1.13rem!important;color:#455267}.ckkb-meta-pills{display:flex;gap:10px;flex-wrap:wrap;margin:18px 0}.ckkb-meta-pills span{background:#f0f3f9;border-radius:999px;padding:7px 11px;font-size:.83rem;font-weight:700}.ckkb-toc{padding:20px 22px;border-left:4px solid #3157d5;background:#f6f8ff;border-radius:0 14px 14px 0;margin:0 0 30px}.ckkb-toc ol{margin:10px 0 0;padding-left:22px}.ckkb-toc a{color:#3157d5;text-decoration:none}.ckkb-step{display:grid;grid-template-columns:44px 1fr;gap:16px;margin:18px 0;padding:20px;border:1px solid #e6eaf1;border-radius:16px;background:#fff}.ckkb-step-number{width:38px;height:38px;border-radius:12px;display:grid;place-items:center;background:#3157d5;color:#fff;font-weight:800}.ckkb-step p{margin:.35rem 0}.ckkb-expected{background:#f7faf8;border-radius:10px;padding:10px 12px;color:#405548}.ckkb-note{padding:18px 20px;border-radius:14px;background:#fff7e8;border:1px solid #f0d8a5;margin:18px 0}.ckkb-note-secondary{background:#f3f6fb;border-color:#dfe6f1}.ckkb-article-footer{margin-top:50px;padding:28px;border-radius:18px;background:#17223c;color:#fff}.ckkb-article-footer p{opacity:.82}.ckkb-pagination{margin-top:28px}.ckkb-pagination .nav-links{display:flex;gap:8px;justify-content:center}.ckkb-pagination a,.ckkb-pagination span{padding:8px 12px;border:1px solid var(--kb-line);border-radius:9px;text-decoration:none}.screen-reader-text{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media(max-width:900px){.ckkb-category-grid{grid-template-columns:1fr}.ckkb-article-grid{grid-template-columns:1fr}.ckkb-hero-inner{padding:54px 25px}.ckkb-category-hero,.ckkb-single-header{padding:30px 24px}.ckkb-search{flex-direction:column}.ckkb-search button{width:100%}}@media(max-width:560px){.ckkb-page{padding-left:14px;padding-right:14px}.ckkb-category-card{padding:22px;min-height:0}.ckkb-category-icon{width:46px;height:46px;flex-basis:46px}.ckkb-step{grid-template-columns:1fr}.ckkb-step-number{width:34px;height:34px}}

/* Article actions and browser-local bookmarks */
.ckkb-article-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:24px}.ckkb-action-button{display:inline-flex;align-items:center;gap:8px;border:1px solid #cbd5e5;border-radius:11px;background:#fff;color:#26344c;padding:10px 14px;font:inherit;font-weight:750;cursor:pointer;transition:.15s ease}.ckkb-action-button:hover{border-color:#3157d5;color:#3157d5}.ckkb-action-button:focus-visible{outline:3px solid rgba(49,87,213,.25);outline-offset:2px}.ckkb-action-button.is-bookmarked{background:#eef2ff;border-color:#b9c6f5;color:#3157d5}.ckkb-bookmarks{border:1px solid var(--kb-line);border-radius:20px;background:#fff;margin:0 8px 34px;padding:26px}.ckkb-bookmarks[hidden]{display:none}.ckkb-bookmark-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px 18px;margin:0;padding:0;list-style:none}.ckkb-bookmark-list li{margin:0}.ckkb-bookmark-list a{display:block;padding:12px 14px;border-radius:11px;background:#f6f8ff;color:#273755;text-decoration:none;font-weight:700}.ckkb-bookmark-list a:hover{background:#eef2ff;color:#3157d5}.ckkb-bookmark-empty{color:var(--kb-muted);margin:0}
@media(max-width:700px){.ckkb-bookmark-list{grid-template-columns:1fr}.ckkb-article-actions{align-items:stretch}.ckkb-action-button{justify-content:center;flex:1 1 160px}}
@media print{body{background:#fff!important}.ckkb-shell{max-width:none!important}.ckkb-page{padding:0!important}.ckkb-breadcrumb,.ckkb-article-actions,.ckkb-article-footer,.ckkb-toc,header:not(.ckkb-single-header),footer:not(.ckkb-article-footer),nav:not(.ckkb-breadcrumb){display:none!important}.ckkb-single-header{border:0!important;background:#fff!important;padding:0 0 18px!important;margin:0!important;box-shadow:none!important}.ckkb-single-header h1{font-size:26pt!important;color:#000!important}.ckkb-single-header p,.ckkb-single-content,.ckkb-single-content p,.ckkb-single-content li{color:#000!important}.ckkb-single-content{font-size:11pt!important;line-height:1.45!important}.ckkb-single-content h2{font-size:17pt!important;page-break-after:avoid}.ckkb-single-content h3{page-break-after:avoid}.ckkb-step,.ckkb-note{box-shadow:none!important;break-inside:avoid;page-break-inside:avoid}.ckkb-step-number{border:1px solid #000!important;background:#fff!important;color:#000!important}.ckkb-expected,.ckkb-note{background:#fff!important;border:1px solid #bbb!important}.ckkb-single-content a{color:#000!important;text-decoration:none!important}}


/* v1.5 hierarchical skill-level navigation */
.ckkb-level-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.ckkb-level-card{position:relative;display:flex;min-height:220px;flex-direction:column;padding:28px;border:1px solid var(--kb-line);border-radius:22px;color:var(--kb-ink);text-decoration:none!important;box-shadow:0 8px 24px rgba(28,41,65,.05);transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease}.ckkb-level-card:hover{transform:translateY(-3px);box-shadow:0 16px 34px rgba(28,41,65,.1)}.ckkb-level-card h2{font-size:1.35rem;line-height:1.3;margin:16px 0 9px}.ckkb-level-card p{margin:0 0 20px;line-height:1.6;color:#536075}.ckkb-level-badge{align-self:flex-start;padding:6px 11px;border-radius:999px;font-size:.78rem;font-weight:800;letter-spacing:.04em;text-transform:uppercase;background:rgba(255,255,255,.68);border:1px solid rgba(24,33,47,.09)}.ckkb-level-count{margin-top:auto;font-size:.86rem;font-weight:800;color:#34445e}.ckkb-level-card.ckkb-level-beginner,.ckkb-mini-pill.ckkb-level-beginner,.ckkb-level-tab.ckkb-level-beginner,.ckkb-category-hero.ckkb-level-beginner{background:#eaf4ff;border-color:#c9e2fb}.ckkb-level-card.ckkb-level-intermediate,.ckkb-mini-pill.ckkb-level-intermediate,.ckkb-level-tab.ckkb-level-intermediate,.ckkb-category-hero.ckkb-level-intermediate{background:#edf9ef;border-color:#cbe8d0}.ckkb-level-card.ckkb-level-advanced,.ckkb-mini-pill.ckkb-level-advanced,.ckkb-level-tab.ckkb-level-advanced,.ckkb-category-hero.ckkb-level-advanced{background:#fdeeee;border-color:#f2cccc}.ckkb-mini-pill.ckkb-level-beginner{color:#285f91}.ckkb-mini-pill.ckkb-level-intermediate{color:#2f6b3d}.ckkb-mini-pill.ckkb-level-advanced{color:#963d3d}.ckkb-level-switcher{display:flex;gap:10px;flex-wrap:wrap;margin:0 0 24px}.ckkb-level-tab{display:inline-flex;gap:8px;align-items:center;padding:9px 13px;border:1px solid var(--kb-line);border-radius:999px;color:#34445e;text-decoration:none!important;font-size:.88rem;font-weight:800;opacity:.78}.ckkb-level-tab:hover,.ckkb-level-tab.is-active{opacity:1;box-shadow:0 4px 12px rgba(28,41,65,.08)}.ckkb-level-tab.is-active{outline:2px solid rgba(49,87,213,.22);outline-offset:2px}.ckkb-level-tab span{min-width:22px;padding:2px 6px;border-radius:999px;background:rgba(255,255,255,.7);text-align:center;font-size:.76rem}@media(max-width:900px){.ckkb-level-grid{grid-template-columns:1fr}.ckkb-level-card{min-height:0}}