:root{--ink:#1b2430;--muted:#5a6675;--brand:#0b4f6c;--accent:#ffd166;--bg:#f7f9fb;--line:#e3e8ee}
*{box-sizing:border-box}
body{margin:0;font:17px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--ink);background:#fff}
a{color:var(--brand)}
header.site{border-bottom:1px solid var(--line);background:#fff}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;padding:14px 20px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.15rem;color:var(--ink);text-decoration:none}
.logo img{width:30px;height:30px}
nav a{margin-left:18px;text-decoration:none;color:var(--muted);font-weight:500}
nav a:hover{color:var(--brand)}
.wrap{max-width:760px;margin:0 auto;padding:0 20px}
.hero{background:linear-gradient(135deg,#0b4f6c,#1d7a9c);color:#fff;padding:44px 0 36px}
.hero h1{margin:0 0 10px;font-size:clamp(1.7rem,4.5vw,2.5rem);line-height:1.2}
.hero p{margin:0;opacity:.92;font-size:1.05rem}
.meta{font-size:.9rem;opacity:.85;margin-top:14px!important}
.crumbs{font-size:.88rem;color:var(--muted);padding:12px 0 0}
.crumbs a{color:var(--muted)}
main h2{margin:2.1em 0 .5em;font-size:1.45rem;line-height:1.3}
main h3{margin:1.5em 0 .3em;font-size:1.12rem}
.toc,.callout,.checklist{background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:16px 22px;margin:24px 0}
.toc ol{margin:.4em 0 0;padding-left:1.2em}
.callout{border-left:5px solid var(--accent)}
.checklist ul{list-style:none;padding:0;margin:.4em 0 0}
.checklist li{padding:6px 0 6px 30px;position:relative;border-bottom:1px dashed var(--line)}
.checklist li:last-child{border:0}
.checklist li:before{content:"";position:absolute;left:2px;top:11px;width:16px;height:16px;border:2px solid var(--brand);border-radius:4px}
.sources{font-size:.92rem;color:var(--muted)}
.sources li{margin-bottom:6px;word-break:break-word}
footer.site{margin-top:56px;border-top:1px solid var(--line);background:var(--bg);font-size:.9rem;color:var(--muted)}
footer.site .wrap{padding:22px 20px}
@media(max-width:520px){nav a{margin-left:12px}body{font-size:16px}}