*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;font:17px/1.65 -apple-system,"Segoe UI",Roboto,Arial,sans-serif;color:#1f2a36;background:#f3f5f8}
a{color:#1d5c96}a:hover{color:#0d3d68}
img{max-width:100%;height:auto}
.wrap{max-width:1180px;margin:0 auto;padding:0 16px}
.top{background:#24486c;color:#fff}
.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:60px;flex-wrap:wrap}
.logo{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none;font-weight:700;font-size:20px;padding:8px 0}
.logo img{width:36px;height:36px}.logo small{display:block;font-weight:400;font-size:12px;opacity:.85}
.logo:hover{color:#fff}
.nav{display:flex;flex-wrap:wrap;gap:2px}
.nav a{color:#fff;text-decoration:none;padding:10px 10px;border-radius:6px;font-size:15px;display:block}
.nav a:hover,.nav a.on{background:#2f5b87}
.navbtn{display:none;background:#2f5b87;color:#fff;border:0;border-radius:6px;font:inherit;font-size:15px;padding:9px 14px;min-height:44px;cursor:pointer}
@media(max-width:900px){.navbtn{display:block}.nav{display:none;width:100%;padding-bottom:10px}.nav.open{display:flex;flex-direction:column}.nav a{padding:12px 10px;border-top:1px solid #34618d}}
.crumbs{font-size:14px;color:#5b6b7b;margin:16px 0 6px}.crumbs a{color:#5b6b7b}
.cols{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:28px;align-items:start;margin:8px auto 32px}
@media(max-width:900px){.cols{grid-template-columns:minmax(0,1fr)}}
main{background:#fff;border:1px solid #e1e7ee;border-radius:12px;padding:22px 28px 28px;min-width:0}
@media(max-width:600px){main{padding:16px 14px 20px;border-radius:8px}.wrap{padding:0 10px}}
h1{font-size:30px;line-height:1.25;margin:4px 0 14px;color:#1b3a5a}
h2{font-size:23px;line-height:1.3;margin:28px 0 10px;color:#1b3a5a}
h3{font-size:19px;margin:22px 0 8px}
@media(max-width:600px){h1{font-size:25px}h2{font-size:20px}}
main p{margin:0 0 14px}
.content figure,.content picture{display:block;margin:14px 0}
.content img{display:block;margin:14px auto;border-radius:6px}
.content picture img{margin:0 auto}
.toc{background:#f4f7fb;border:1px solid #dfe7f0;border-radius:8px;padding:10px 14px;margin:16px 0}
.toc summary{cursor:pointer;font-weight:700;min-height:28px}
.toc ol{margin:8px 0 2px;padding-left:22px}.toc li{margin:4px 0}
.related{margin-top:26px;border-top:2px solid #e8eef5;padding-top:12px}
.related ul,.seealso{padding-left:20px}.related li,.seealso li{margin:6px 0}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:14px;margin:16px 0}
.card{border:1px solid #e1e7ee;border-radius:10px;padding:10px;background:#fbfcfe}
.card a.t{font-weight:700;text-decoration:none;display:block;margin:6px 0 4px;line-height:1.35}
.card img{display:block;margin:0 auto;border-radius:6px}.card p{font-size:15px;margin:0;color:#3b4a59}
.yt{position:relative;max-width:640px;aspect-ratio:16/9;margin:16px auto;background:#000 center/cover no-repeat;border-radius:8px;cursor:pointer}
.yt button{position:absolute;inset:0;margin:auto;width:72px;height:50px;border:0;border-radius:12px;background:#c00;color:#fff;font-size:22px;cursor:pointer}
.yt iframe{position:absolute;inset:0;width:100%;height:100%;border:0;border-radius:8px}
.tbl{overflow-x:auto}table{border-collapse:collapse;width:100%}td,th{border:1px solid #dfe7f0;padding:6px 8px;vertical-align:top}
aside .box{background:#fff;border:1px solid #e1e7ee;border-radius:12px;padding:14px 16px;margin-bottom:16px}
aside .box b{display:block;color:#1b3a5a;margin-bottom:6px}
aside ul{list-style:none;margin:0;padding:0}aside li{border-top:1px solid #eef2f6}aside li:first-child{border-top:0}
aside li a{display:block;padding:7px 0;text-decoration:none;font-size:15px;line-height:1.35}
.credit{font-size:13px;color:#6b7988;margin:-6px 0 14px;text-align:center}
.foot{background:#1b3a5a;color:#d9e3ee;font-size:14px;padding:22px 0}
.foot a{color:#fff;display:inline-block;padding:6px 8px}.foot p{margin:8px 0 0}
.nf{text-align:center;padding:30px 0}.nf .code{font-size:72px;font-weight:800;color:#2f5b87;line-height:1}
.note{background:#fff8e6;border-left:4px solid #f5c451;padding:10px 14px;border-radius:6px}
.abc{display:flex;flex-wrap:wrap;gap:6px}.abc a,.abc b{display:inline-block;min-width:36px;min-height:36px;line-height:36px;text-align:center;border:1px solid #dfe7f0;border-radius:6px;text-decoration:none}.abc b{background:#2f5b87;color:#fff}

picture.tall img{max-height:640px;width:auto}