:root{--navy:#071a3b;--blue:#1648e8;--lime:#91ed00;--paper:#f6f8fc;--line:#d7e1ef;--muted:#52627c;--cream:#f7ffe8}*{box-sizing:border-box}html,body{max-width:100%;overflow-x:hidden}body{margin:0;color:var(--navy);background:var(--paper);font:18px/1.7 system-ui,-apple-system,Segoe UI,sans-serif}a{color:#064be9;overflow-wrap:anywhere}header{background:#fff;border-bottom:1px solid var(--line)}.bar{max-width:1120px;margin:auto;padding:20px 24px;display:flex;align-items:center;justify-content:space-between;gap:22px}.brand{font-size:1.15rem;font-weight:850;text-decoration:none;color:var(--navy)}nav{display:flex;gap:18px;flex-wrap:wrap}main{max-width:920px;margin:45px auto;padding:0 24px 70px}.hero{padding:40px;border:1px solid #cfe39e;border-radius:24px;background:linear-gradient(135deg,var(--cream),#fff)}.eyebrow{color:var(--blue);font-weight:850;letter-spacing:.13em;font-size:.78rem}h1{font-size:clamp(2.2rem,6vw,4rem);line-height:1.05;margin:.25em 0;overflow-wrap:anywhere}h2{font-size:clamp(1.5rem,4vw,1.75rem);line-height:1.25;margin-top:2em}h3{font-size:1.2rem;margin-top:1.6em}.lede{font-size:1.18rem;color:#263956}.card,.toc,.note,.example{background:#fff;border:1px solid var(--line);border-radius:18px;padding:25px;margin:24px 0}.example{border-left:6px solid var(--blue);background:#f6f9ff}.note{border-color:#b9db79;background:#f3ffdf}.toc a{display:block;padding:5px 0}.checklist li{margin:.65em 0}.byline{color:var(--muted);font-size:.92rem}.cta{display:inline-block;background:var(--lime);color:#071a3b;text-decoration:none;font-weight:850;padding:13px 20px;border-radius:10px}footer{background:#071a3b;color:#fff}.foot{max-width:1120px;margin:auto;padding:32px 24px;display:flex;justify-content:space-between;gap:25px;flex-wrap:wrap}.foot a{color:#fff}.foot nav{max-width:600px}.footer-legal{flex:0 0 100%;margin:0;padding-top:18px;border-top:1px solid rgba(255,255,255,.18);color:#c7d2e6;font-size:13px;text-align:center}@media(max-width:700px){body{font-size:16px}.bar{align-items:flex-start;flex-direction:column;padding:16px}.hero{padding:22px;border-radius:18px}main{margin:24px auto;padding:0 14px 50px}nav{gap:10px 14px}.card,.toc,.note,.example{padding:19px}.foot{display:block;padding:28px 18px}.foot nav{margin:15px 0}.footer-legal{text-align:left;font-size:12px}}

.breadcrumbs{max-width:760px;margin:0 auto 18px;color:var(--muted);font-size:.84rem}.breadcrumbs a{text-decoration:none}.article-page{max-width:1120px}.article-page .hero{max-width:920px;margin:0 auto}.article-meta{display:flex;gap:10px 18px;flex-wrap:wrap;margin-top:18px;color:var(--muted);font-size:.86rem}.article-layout{display:grid;grid-template-columns:240px minmax(0,760px);justify-content:center;align-items:start;gap:42px;margin-top:34px}.article-layout .toc{position:sticky;top:20px;margin:0}.article-layout .toc strong{display:block;margin-bottom:8px}.article-layout .toc a{font-size:.88rem;text-decoration:none}.article-body{min-width:0}.article-body>section:not(.example){padding-bottom:9px;border-bottom:1px solid #e7ecf3}.article-body p{color:#263956}.related-guides{margin-top:38px;padding:26px;border:1px solid var(--line);border-radius:18px;background:#fff}.related-guides h2{margin-top:0}.related-links{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.related-links a{padding:15px;border-radius:12px;background:#f1f6ff;font-weight:800;text-decoration:none}.guide-hub{max-width:1120px}.guide-category{margin:34px 0}.guide-category>h2{margin-bottom:4px}.guide-category>p{margin-top:0;color:var(--muted)}.guide-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.guide-grid .card{height:100%;margin:0;transition:transform .18s ease,box-shadow .18s ease}.guide-grid .card:hover{transform:translateY(-2px);box-shadow:0 14px 34px rgba(28,50,96,.09)}.guide-grid .card h3{margin:0 0 8px}.guide-grid .card h3 a{text-decoration:none}.guide-grid .card p{margin-bottom:0;color:#34435b}
@media(max-width:820px){.article-layout{grid-template-columns:1fr;gap:18px}.article-layout .toc{position:static}.related-links,.guide-grid{grid-template-columns:1fr}.article-page .hero{max-width:none}}

/* AI From Zero course */
.beginner-article .hero{background:linear-gradient(135deg,#f1ffdc,#fff)}
.simple-steps{display:grid;gap:12px}.simple-steps section{border:1px solid var(--line);border-radius:14px;padding:8px 18px;background:#fff}.simple-steps h3{margin:.55em 0;font-size:1.05rem}.prompt-box{margin:26px 0;padding:22px;border-radius:18px;background:#f1f6ff;border:1px solid #cbdcff}.prompt-box h2{margin-top:0}.prompt-box blockquote{margin:12px 0 0;padding:17px 20px;background:#fff;border-left:5px solid var(--blue);font-weight:700}.learn-more{margin:26px 0;border:1px solid var(--line);border-radius:16px;background:#fff;padding:18px}.learn-more summary{cursor:pointer;color:var(--blue);font-weight:850}.learn-more h2{margin-top:18px}.tool-checks{list-style:none;padding:0}.tool-checks li{margin:12px 0;padding:14px 16px;border:1px solid var(--line);border-radius:12px;background:#fff}.tool-checks li span{color:#2c8b12;font-weight:900;margin-right:5px}.plain-note{color:var(--muted)}.safety-box{margin:25px 0;padding:22px;border:1px solid #efcf7d;border-radius:18px;background:#fff8df}.safety-box h2{margin-top:0}.lesson-nav{display:flex;justify-content:space-between;gap:16px;margin:35px 0}.lesson-nav a{display:inline-block;padding:13px 17px;border:1px solid #aac0ef;border-radius:10px;background:#fff;text-decoration:none;font-weight:800}.course-progress{margin:25px 0;padding:18px 22px;border-radius:16px;background:#071a3b;color:#fff;display:flex;justify-content:space-between;gap:15px;flex-wrap:wrap}.beginner-grid .card{position:relative;padding-top:48px}.lesson-number{position:absolute;top:17px;left:22px;color:#2052db;font-size:.75rem;font-weight:900;letter-spacing:.1em}.lesson-link{display:inline-block;margin-top:14px;font-weight:800;text-decoration:none}
@media(max-width:700px){.prompt-box,.safety-box,.learn-more{padding:17px}.lesson-nav{flex-direction:column}.lesson-nav a{text-align:center}.tool-checks li{padding:12px}.beginner-grid .card{padding-top:44px}}