:root{--bg:#f6f8fb;--surface:#fff;--text:#101828;--muted:#5e6b7d;--line:#e4e9f1;--brand:#2563eb;--brand2:#7c3aed;--soft:#eef4ff;--code:#0b1220;--shadow:0 16px 45px rgba(15,23,42,.08)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,system-ui,-apple-system,Segoe UI,sans-serif;line-height:1.72}a{color:var(--brand);text-underline-offset:3px}img{display:block;max-width:100%;height:auto}code,pre{font-family:Consolas,monospace}.lab-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line)}.lab-head{width:min(1240px,calc(100% - 24px));margin:auto;display:flex;align-items:center;gap:16px;padding:12px 0}.brand{font-weight:900;text-decoration:none;color:#0f172a}.brand span{color:var(--brand)}.nav{display:flex;gap:12px;overflow:auto;white-space:nowrap;padding-bottom:10px}.nav a{text-decoration:none;color:#475467;font-size:.86rem}.search{margin-left:auto}.search input{padding:9px 11px;border:1px solid #ccd5e0;border-radius:9px}.page{width:min(1240px,calc(100% - 24px));margin:auto;padding:26px 0 80px}.crumbs{font-size:.86rem;color:#667085;margin-bottom:16px}.crumbs ol{list-style:none;display:flex;gap:8px;flex-wrap:wrap;padding:0;margin:0}.crumbs li:not(:last-child)::after{content:"/";margin-left:8px}.hero{background:#fff;border:1px solid var(--line);border-radius:24px;overflow:hidden;box-shadow:var(--shadow)}.hero-grid{display:grid;grid-template-columns:1.1fr .9fr}.hero-copy{padding:42px}.eyebrow{font-size:.76rem;font-weight:900;letter-spacing:.1em;text-transform:uppercase;color:var(--brand)}h1{font-size:clamp(2.1rem,4.5vw,4.25rem);line-height:1.03;letter-spacing:-.045em;margin:12px 0 16px}.lede{font-size:1.08rem;color:var(--muted)}.hero-media{background:#0b1220}.hero-media img{width:100%;height:100%;object-fit:cover}.layout{display:grid;grid-template-columns:250px minmax(0,820px);justify-content:center;gap:42px;margin-top:36px}.toc{position:sticky;top:96px;align-self:start;background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px;max-height:calc(100vh - 120px);overflow:auto}.toc ol{padding-left:18px}.toc li{margin:7px 0;font-size:.84rem}.toc a{text-decoration:none;color:#667085}.content section{margin-bottom:44px;scroll-margin-top:105px}.content h2{font-size:clamp(1.55rem,2.6vw,2.2rem);line-height:1.2;margin:0 0 14px}.content p,.content li{color:#344054}.quick,.note,.warn,.exercise{padding:20px 22px;border-radius:15px;margin:22px 0}.quick{background:#eef4ff;border:1px solid #cadcff}.note{background:#effcf5;border:1px solid #c8ecd9}.warn{background:#fff8e8;border:1px solid #efdcae}.exercise{background:#f9f5ff;border:1px solid #e2d2ff}.codebox{background:var(--code);border-radius:15px;overflow:hidden;margin:20px 0}.codebar{display:flex;justify-content:space-between;padding:10px 13px;background:#131d31;color:#b8c5d8}.copy{border:1px solid #41516d;background:#1d2a43;color:#fff;border-radius:8px;padding:6px 9px}.codebox pre{margin:0;padding:18px;color:#e6edf7;overflow:auto;line-height:1.6}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.card{display:block;background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px;text-decoration:none;color:inherit}.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;margin:10px 0}.faq summary{cursor:pointer;font-weight:800;padding:15px 17px}.faq p{padding:0 17px 16px}.footer{border-top:1px solid var(--line);background:#fff}.foot{width:min(1240px,calc(100% - 24px));margin:auto;padding:30px 0;color:#667085}.progress{position:fixed;z-index:100;top:0;left:0;height:3px;width:0;background:linear-gradient(90deg,var(--brand),var(--brand2))}@media(max-width:980px){.hero-grid,.layout{grid-template-columns:1fr}.toc{position:static}.grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:650px){.page{width:min(100% - 16px,1240px)}.hero-copy{padding:24px}.search{display:none}.grid{grid-template-columns:1fr}}