:root{--brand:#4e729f;--brand-dark:#3b5a80;--brand-tint:#eef3f9;--accent:#c55a1a;--ink:#1d2733;--muted:#5b6776;--line:#e2e7ee;--bg:#fff;--bg-soft:#f7f9fc;--radius:10px;--max:1160px;--font:system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;color-scheme:light}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{font-family:var(--font);color:var(--ink);background:var(--bg);margin:0;font-size:17px;line-height:1.6}img{max-width:100%;height:auto}a{color:var(--brand)}a:hover{color:var(--brand-dark)}h1,h2,h3{color:var(--ink);line-height:1.2}h1{letter-spacing:-.01em;margin:0 0 .5em;font-size:clamp(2rem,4.5vw,2.9rem)}h2{margin:1.6em 0 .6em;font-size:clamp(1.45rem,3vw,1.9rem)}h3{margin:1.4em 0 .4em;font-size:1.15rem}.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}.muted{color:var(--muted)}.center{text-align:center}.rule{background:var(--accent);border:0;height:4px;margin:0}.btn{background:var(--brand);color:#fff;border:2px solid var(--brand);border-radius:8px;padding:.7em 1.4em;font-weight:600;text-decoration:none;transition:background .15s,border-color .15s;display:inline-block}.btn:hover{background:var(--brand-dark);border-color:var(--brand-dark);color:#fff}.btn.ghost{color:var(--brand);background:0 0}.btn.ghost:hover{background:var(--brand-tint);color:var(--brand-dark)}.site-header{border-bottom:1px solid var(--line);z-index:10;background:#fff;position:sticky;top:0}.site-header .wrap{justify-content:space-between;align-items:center;gap:16px;min-height:68px;display:flex}.logo{color:var(--brand);letter-spacing:-.02em;font-size:1.9rem;font-weight:700;text-decoration:none}.nav{flex-wrap:wrap;align-items:center;gap:4px;display:flex}.nav a{color:var(--ink);border-radius:6px;padding:8px 10px;font-size:.95rem;text-decoration:none}.nav a:hover,.nav a[aria-current=page]{color:var(--brand);background:var(--brand-tint)}.nav .btn{color:#fff;margin-left:6px;padding:8px 14px}.nav-toggle{display:none}@media (width<=920px){.nav-toggle{border:1px solid var(--line);cursor:pointer;background:0 0;border-radius:6px;padding:6px 10px;font-size:1rem;display:block}.nav{border-bottom:1px solid var(--line);background:#fff;flex-direction:column;align-items:stretch;padding:8px 20px 16px;display:none;position:absolute;top:68px;left:0;right:0}.nav.open{display:flex}.nav .btn{text-align:center;margin:8px 0 0}}.site-footer{border-top:1px solid var(--line);background:var(--bg-soft);margin-top:80px;padding:40px 0;font-size:.95rem}.site-footer .wrap{grid-template-columns:2fr 1fr 1fr 1fr;gap:24px;display:grid}.site-footer h4{text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin:0 0 8px;font-size:.9rem}.site-footer ul{margin:0;padding:0;list-style:none}.site-footer li{margin:4px 0}.site-footer a{color:var(--ink);text-decoration:none}.site-footer a:hover{color:var(--brand)}@media (width<=720px){.site-footer .wrap{grid-template-columns:1fr 1fr}}.hero{padding:64px 0 56px}.hero .wrap{grid-template-columns:1.1fr 1fr;align-items:center;gap:48px;display:grid}.hero h1{color:var(--brand)}.hero .lead{color:var(--muted);font-size:1.2rem}.hero ul{padding-left:1.2em}.hero img{border-radius:var(--radius);box-shadow:0 12px 40px #1d27332e}@media (width<=820px){.hero .wrap{grid-template-columns:1fr}}.section{padding:56px 0}.section.soft{background:var(--bg-soft)}.page-head{text-align:center;padding:48px 0 8px}.page-head p{color:var(--muted);max-width:720px;margin:0 auto;font-size:1.1rem}.grid{grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:20px;display:grid}.card{border:1px solid var(--line);border-radius:var(--radius);background:#fff;padding:20px}.card h3{margin-top:0}.card p{color:var(--muted);margin:0}a.card{color:inherit;text-decoration:none;transition:border-color .15s,box-shadow .15s}a.card:hover{border-color:var(--brand);box-shadow:0 4px 16px #4e729f26}.prose{max-width:760px}.prose img{border:1px solid var(--line);border-radius:6px;margin:8px 0}.prose table{border-collapse:collapse;width:100%;display:block;overflow-x:auto}.prose th,.prose td{border:1px solid var(--line);text-align:left;padding:6px 10px}.prose pre{color:#e8edf3;background:#1d2733;border-radius:8px;padding:14px;font-size:.9rem;overflow-x:auto}.prose code{font-size:.9em}.prose iframe{aspect-ratio:16/9;border:0;width:100%;max-width:100%;height:auto}.prose blockquote{border-left:4px solid var(--brand);background:var(--brand-tint);margin:1em 0;padding:.2em 1em}.meta{color:var(--muted);font-size:.9rem}.breadcrumb{color:var(--muted);margin:24px 0 8px;font-size:.9rem}.breadcrumb a{color:var(--muted)}