*{box-sizing:border-box}
:root{--accent:#1a5490;--ink:#1d2329;--muted:#5b6670;--line:#e3e7ea;--bg:#ffffff;--soft:#f5f7f8}
html{-webkit-text-size-adjust:100%}
body{margin:0;font:17px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;color:var(--ink);background:var(--bg)}
a{color:var(--accent)}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
.top{background:var(--bg)}
.brandrow{padding-top:16px;padding-bottom:16px}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:700;font-size:20px;color:var(--ink);text-decoration:none}
.mark{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:7px;background:var(--accent);color:#fff;font-size:18px}
.menu{background:var(--accent)}
.menu>.wrap>ul{display:flex;flex-wrap:wrap;gap:0 4px;list-style:none;margin:0;padding:0}
.menu>.wrap>ul>li>a,.dropdown summary{display:block;color:#fff;text-decoration:none;font-size:15px;font-weight:600;padding:11px 14px;cursor:pointer}
.menu>.wrap>ul>li>a:hover,.menu>.wrap>ul>li>a[aria-current],.dropdown summary:hover,.dropdown[open] summary{background:rgba(0,0,0,.18)}
.dropdown{position:relative}
.dropdown summary{list-style:none}
.dropdown summary::-webkit-details-marker{display:none}
.dropdown summary::after{content:" ▾"}
.dropdown ul{position:absolute;z-index:10;left:0;top:100%;min-width:300px;max-width:min(520px,90vw);max-height:70vh;overflow:auto;list-style:none;margin:0;padding:6px 0;background:var(--bg);border:1px solid var(--line);border-radius:0 0 8px 8px;box-shadow:0 8px 24px rgba(0,0,0,.14)}
.dropdown li a{display:block;padding:8px 16px;color:var(--ink);text-decoration:none;font-size:15px;line-height:1.35}
.dropdown li a:hover,.dropdown li a[aria-current]{background:var(--soft);color:var(--accent)}
main{padding-top:28px;padding-bottom:48px}
h1,h2,h3{line-height:1.25;letter-spacing:-.01em}
h1{font-size:36px;margin:0 0 16px}
h2{font-size:24px;margin:36px 0 12px}
h3{font-size:19px;margin:28px 0 8px}
.hero{max-width:760px;margin:0 auto 8px}
.hero .lead p{font-size:19px;color:var(--muted);margin:0 0 22px}
.hero-img{margin:0 0 24px}
.hero-img img{border-radius:10px}
.content,.crumbs{max-width:760px;margin-left:auto;margin-right:auto}
.content figure{margin:0 0 24px}
.content figure img{border-radius:8px}
.crumbs{font-size:14px;color:var(--muted);margin-bottom:14px}
.crumbs a{color:var(--muted)}
.toc{background:var(--soft);border-left:4px solid var(--accent);padding:14px 18px;margin:0 0 28px;border-radius:0 8px 8px 0}
.toc ol{margin:8px 0 0;padding-left:20px}
.toc li{margin:2px 0}
.cards{margin-top:48px;border-top:1px solid var(--line);padding-top:8px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{display:flex;flex-direction:column;gap:8px;text-decoration:none;color:var(--ink);background:var(--soft);border-radius:10px;overflow:hidden;padding-bottom:16px}
.card img{aspect-ratio:16/10;object-fit:cover;width:100%}
.card .t{font-weight:650;font-size:18px;line-height:1.3;padding:0 16px}
.card .x{font-size:15px;color:var(--muted);padding:0 16px}
.card:not(:has(img)) .t{padding-top:16px}
.card:hover .t{color:var(--accent)}
.foot{background:var(--soft);border-top:1px solid var(--line);font-size:15px}
.foot .wrap{display:grid;grid-template-columns:2fr 1fr;gap:24px;padding-top:32px;padding-bottom:32px}
.foot p{color:var(--muted)}
.foot .links{list-style:none;margin:0;padding:0}
.foot .links li{margin:4px 0}
.foot .copy{grid-column:1/-1;margin:0;font-size:14px}
@media (max-width:820px){.grid{grid-template-columns:repeat(2,1fr)}h1{font-size:30px}}
@media (max-width:540px){.grid,.foot .wrap{grid-template-columns:1fr}body{font-size:16px}}
@media (prefers-color-scheme:dark){:root{--ink:#e6e9ec;--muted:#a3adb6;--line:#2c3237;--bg:#14181b;--soft:#1c2125}a{color:color-mix(in srgb,var(--accent) 55%,#fff)}}