:root{--bg:#fff;--fg:#1c2330;--muted:#5b6678;--line:#e3e7ee;--accent:#0b7a5a;--accent-fg:#fff;--card:#f6f8fb;--ad:#fafafa}
@media (prefers-color-scheme:dark){:root{--bg:#10151c;--fg:#e6eaf0;--muted:#9aa5b5;--line:#252d38;--accent:#3ecf9f;--accent-fg:#06281e;--card:#171e27;--ad:#141a22}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
.wrap{max-width:860px;margin:0 auto;padding:0 16px}
a{color:var(--accent)}
.site-header{border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;flex-wrap:wrap;align-items:center;gap:8px 24px;padding-top:14px;padding-bottom:14px}
.brand{font-weight:800;font-size:1.2rem;text-decoration:none;color:var(--fg)}
nav a{margin-right:16px;font-size:.92rem;text-decoration:none;color:var(--muted)}
nav a:hover{color:var(--accent)}
h1{font-size:2rem;line-height:1.2;margin:1.4rem 0 .6rem}
h2{font-size:1.45rem;line-height:1.3;margin:2rem 0 .6rem}
h3{font-size:1.1rem;margin:.3rem 0}
.hero{padding:1.5rem 0 .5rem}
.hero p,.lead{color:var(--muted);font-size:1.1rem}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px}
.card h3 a{text-decoration:none;color:var(--fg)}
.card p{margin:.4rem 0 0;color:var(--muted);font-size:.95rem;line-height:1.5}
.tag{font-size:.75rem;font-weight:700;color:var(--accent);text-transform:uppercase;letter-spacing:.04em}
.cats{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:12px}
.cat{display:block;border:1px solid var(--line);border-radius:12px;padding:14px;text-decoration:none;color:var(--fg)}
.cat span{display:block;color:var(--muted);font-size:.9rem}
.button{display:inline-block;background:var(--accent);color:var(--accent-fg);padding:10px 18px;border-radius:10px;text-decoration:none;font-weight:700}
.post{max-width:700px}
.crumbs{font-size:.85rem;color:var(--muted);margin-top:1rem}
.crumbs a{color:var(--muted)}
.meta{color:var(--muted);font-size:.9rem;margin-top:0}
.toc-box{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:12px 16px;margin:1rem 0;font-size:.95rem}
.toc-box ul{margin:.4rem 0 0;padding-left:1.2rem}
.prose table{width:100%;border-collapse:collapse;margin:1rem 0;font-size:.95rem;display:block;overflow-x:auto}
.prose th,.prose td{border:1px solid var(--line);padding:8px 10px;text-align:left}
.prose th{background:var(--card)}
.prose blockquote{margin:1rem 0;padding:.6rem 1rem;border-left:4px solid var(--accent);background:var(--card);border-radius:0 8px 8px 0}
.prose code{background:var(--card);padding:1px 5px;border-radius:5px;font-size:.92em}
.ad-slot{margin:1.5rem 0;padding:6px;background:var(--ad);text-align:center;min-height:100px}
.ad-label{display:block;font-size:.65rem;color:var(--muted);text-transform:uppercase;letter-spacing:.06em}
.related{margin-top:2.5rem}
.calc{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px;max-width:520px}
.calc label{display:block;font-weight:600;margin-top:12px;font-size:.95rem}
.calc input{width:100%;padding:9px 10px;font-size:1rem;border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--fg)}
.calc .out{margin-top:16px;padding:12px;border-radius:8px;background:var(--bg);border:1px solid var(--line)}
.calc .out strong{font-size:1.25rem}
.site-footer{margin-top:3rem;border-top:1px solid var(--line);padding:1.5rem 0;color:var(--muted)}
.small{font-size:.85rem}
@media (max-width:600px){h1{font-size:1.65rem}body{font-size:16.5px}}
.toc-box .toc{margin:0;padding:0;border:0;background:none}
.search{display:flex;gap:8px;margin:1rem 0;max-width:560px}
.search input{flex:1;padding:11px 12px;font-size:1rem;border:1px solid var(--line);border-radius:10px;background:var(--bg);color:var(--fg)}
.search button{padding:0 18px;border:0;border-radius:10px;background:var(--accent);color:var(--accent-fg);font-weight:700;font-size:1rem;cursor:pointer}
.callout{margin:1.5rem 0;padding:14px 16px;border:1px solid var(--accent);border-radius:12px;background:var(--card)}
.faq h3{font-size:1.05rem;margin:1.2rem 0 .2rem}
.faq p{margin:.2rem 0 0}
.topics{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px;margin-top:1rem}
.topic h2{margin:1.2rem 0 .3rem;font-size:1.25rem}
.topic h2 a{text-decoration:none;color:var(--fg)}
.topic p{margin:.2rem 0;color:var(--muted);font-size:.95rem}
.topic ul{padding-left:1.1rem;margin:.5rem 0}
.topic li{margin:.25rem 0;font-size:.95rem}
.more{font-size:.9rem;font-weight:600}
.calc .row{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.calc h3{margin:1.2rem 0 0;font-size:1rem}
@media (max-width:480px){.calc .row{grid-template-columns:1fr}}
.skip{position:absolute;left:-9999px;top:0;background:var(--accent);color:var(--accent-fg);padding:8px 14px;z-index:10;border-radius:0 0 8px 0}
.skip:focus{left:0}
a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
.topic ul,.post section ul{line-height:1.5}