:root{--ink:#1b2b2d;--teal:#0F5257;--teal2:#0b3d41;--amber:#E0A030;--amber2:#fff4dd;--bg:#f4f7f6;--card:#fff;--line:#d5dfdd;--mute:#4d6366}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.65 -apple-system,"Segoe UI",Roboto,Arial,sans-serif}
a{color:#0b5a63}a:hover{color:var(--teal2)}
.strip{background:var(--teal2);color:#fff;font-size:14px;line-height:1.4;padding:8px 16px;text-align:center}
header.top{background:#fff;border-bottom:1px solid var(--line)}
.wrap{max-width:1040px;margin:0 auto;padding:0 18px}
.brandrow{display:flex;align-items:center;gap:14px;padding:16px 0 8px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--teal2)}
.brand b{font:700 25px/1.1 Georgia,"Times New Roman",serif;display:block;letter-spacing:.2px}
.brand span{font-size:13px;color:var(--mute);letter-spacing:.4px;text-transform:uppercase}
nav.main{display:flex;flex-wrap:wrap;gap:2px 4px;padding:6px 0 12px}
nav.main>div{position:relative}
nav.main a.nl{display:block;text-decoration:none;color:var(--teal2);padding:7px 12px;border-radius:7px;font-size:15.5px}
nav.main a.nl:hover,nav.main a.nl.on{background:var(--amber2);color:var(--teal2)}
nav.main a.nl.on{box-shadow:inset 0 -3px 0 var(--amber)}
.sub{display:none;position:absolute;z-index:5;left:0;top:100%;background:#fff;border:1px solid var(--line);border-radius:8px;min-width:200px;padding:6px;box-shadow:0 8px 24px rgba(0,0,0,.08)}
nav.main>div:hover .sub,nav.main>div:focus-within .sub{display:block}
.sub a{display:block;padding:7px 10px;text-decoration:none;color:var(--teal2);border-radius:6px;font-size:15px}.sub a:hover{background:var(--amber2)}
main{padding:30px 0 50px}
h1{font:700 34px/1.2 Georgia,"Times New Roman",serif;color:var(--teal2);margin:0 0 6px}
h2{font:700 24px/1.3 Georgia,serif;color:var(--teal2);margin:34px 0 10px}
h3{font:700 18px/1.4 -apple-system,"Segoe UI",Arial,sans-serif;color:var(--teal);margin:22px 0 6px}
.crumb{color:var(--mute);font-size:14px;margin-bottom:12px}.crumb a{color:var(--mute)}
.lede{font-size:19px;color:#2b4043;max-width:720px}
.hero{background:linear-gradient(135deg,var(--teal) 0%,var(--teal2) 100%);color:#fff;border-radius:16px;padding:40px 34px;margin-bottom:28px}
.hero h1{color:#fff;font-size:38px;max-width:680px}.hero p{font-size:19px;max-width:640px;margin:10px 0 0;color:#e7f1f0}
.hero .tag{display:inline-block;background:var(--amber);color:#2a1d00;font-weight:700;font-size:13px;letter-spacing:.5px;text-transform:uppercase;border-radius:20px;padding:3px 12px;margin-bottom:14px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px;margin:18px 0}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px;text-decoration:none;color:var(--ink);display:block}
.card:hover{border-color:var(--amber);box-shadow:0 4px 16px rgba(0,0,0,.06)}
.card b{display:block;font:700 19px/1.3 Georgia,serif;color:var(--teal2);margin-bottom:4px}.card span{font-size:15px;color:var(--mute)}
.note{background:var(--amber2);border-left:4px solid var(--amber);padding:12px 16px;border-radius:6px;font-size:15.5px;margin:18px 0}
.layout{display:grid;grid-template-columns:250px 1fr;gap:28px;align-items:start}
.toc{position:sticky;top:12px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px;font-size:15px}
.toc a{display:flex;justify-content:space-between;gap:8px;padding:6px 8px;border-radius:6px;text-decoration:none;color:var(--teal2)}.toc a:hover{background:var(--amber2)}
.toc small{color:var(--mute)}
section.sheet{background:#fff;border:1px solid var(--line);border-radius:12px;padding:6px 22px 14px;margin-bottom:20px;scroll-margin-top:12px}
section.sheet>h2{margin:16px 0 4px}.dl{font-size:15px;margin:0 0 10px}
details{border-top:1px solid var(--line);padding:2px 0}details:first-of-type{border-top:0}
summary{cursor:pointer;font-weight:600;color:var(--teal);padding:10px 0;list-style:none}summary::-webkit-details-marker{display:none}
summary:before{content:"+";display:inline-block;width:22px;color:var(--amber);font-weight:700}details[open]>summary:before{content:"\2212"}
details>div{padding:0 0 10px 22px}
p{margin:0 0 .85em}ul{margin:0 0 1em;padding-left:1.3em}li{margin-bottom:.35em}
p.caution{background:#fdeceb;border-left:4px solid #b3362e;padding:8px 12px;border-radius:5px}
.dir h2{font-size:21px;margin-top:26px}
footer{background:var(--teal2);color:#d6e4e3;font-size:14.5px;padding:30px 0}
footer a{color:#fff}footer .fl{display:flex;flex-wrap:wrap;gap:6px 16px;margin:12px 0}
@media(max-width:820px){.layout{grid-template-columns:1fr}.toc{position:static}.hero{padding:28px 20px}.hero h1,h1{font-size:28px}
 .sub{position:static;display:block;border:0;box-shadow:none;padding:0 0 0 14px}nav.main>div .sub a{padding:4px 10px}}