:root{--bg:#f7f8f5;--surface:#fff;--ink:#0f1f17;--muted:#5b6b62;--line:#e3e8e2;--green:#166534;--green-2:#1f8a4c;--mint:#6ee7a8;--mint-soft:#dcfce9;--shadow:0 1px 2px rgba(15,31,23,.04),0 12px 40px -12px rgba(15,31,23,.14)}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:84px}
body{background:var(--bg);color:var(--ink);font:400 16px/1.65 Inter,system-ui,sans-serif;-webkit-font-smoothing:antialiased}
a{color:var(--green-2)}
h1,h2,h3{font-family:"Inter Tight",Inter,sans-serif;letter-spacing:-.02em;line-height:1.2}
kbd{font:600 11px Inter,sans-serif;border:1px solid var(--line);border-bottom-width:2px;border-radius:5px;padding:1px 6px;color:var(--muted);background:#fff}

/* top bar */
.top{position:sticky;top:0;z-index:30;background:rgba(247,248,245,.85);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.top-in{max-width:1320px;margin:0 auto;height:64px;padding:0 20px;display:flex;align-items:center;gap:18px}
.brand{display:flex;align-items:center;gap:9px;text-decoration:none;color:var(--ink);font:700 18px "Inter Tight",sans-serif;white-space:nowrap}
.brand svg{width:30px;height:30px}.brand b{color:var(--green)}
.sbtn{flex:1;max-width:440px;display:flex;align-items:center;justify-content:space-between;gap:10px;border:1px solid var(--line);background:#fff;border-radius:10px;padding:8px 12px;color:var(--muted);font:inherit;font-size:14px;cursor:pointer;text-align:left}
.sbtn:hover{border-color:#c9d3cb}
.tl{display:flex;gap:18px;align-items:center;margin-left:auto;font-size:14px;white-space:nowrap}
.tl a{color:var(--muted);text-decoration:none}.tl a:hover{color:var(--ink)}
.tl .go{background:var(--green);color:#fff;padding:8px 14px;border-radius:999px;font-weight:600}.tl .go:hover{color:#fff;background:#125a2d}
.menu{display:none;border:0;background:none;font-size:22px;cursor:pointer;color:var(--ink)}
@media(max-width:900px){.tl a:not(.go){display:none}}
@media(max-width:640px){.tl{display:none}.sbtn span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.sbtn kbd{display:none}.top-in{gap:10px;padding:0 16px}}

/* home */
.hero{background:radial-gradient(900px 300px at 20% 0%,#d9f7e6,transparent),radial-gradient(700px 260px at 90% 10%,#f3ead8,transparent)}
.hero-in{max-width:760px;margin:0 auto;padding:72px 20px 56px;text-align:center}
.hero h1{font-size:clamp(34px,5vw,52px)}
.hero p{color:var(--muted);font-size:18px;margin:10px 0 26px}
.hsearch{width:100%;display:flex;justify-content:space-between;align-items:center;gap:12px;border:1px solid var(--line);background:#fff;border-radius:14px;padding:16px 18px;font:inherit;font-size:17px;color:var(--muted);cursor:pointer;box-shadow:var(--shadow);text-align:left}
.hsearch:hover{border-color:#c9d3cb}
.pop{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin-top:18px;align-items:center}
.pop small{color:var(--muted)}
.chip{font-size:13px;padding:5px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);text-decoration:none;color:var(--ink)}
.chip:hover{border-color:var(--green-2);color:var(--green)}
.cards{max-width:1180px;margin:0 auto;padding:10px 20px 40px;display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}
.card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:24px}
.card h2{font-size:19px;display:flex;align-items:center;gap:10px}
.card h2 span{width:36px;height:36px;border-radius:10px;background:var(--mint-soft);display:grid;place-items:center;font-size:18px}
.card p{color:var(--muted);font-size:14px;margin:8px 0 12px}
.card ul{list-style:none;display:flex;flex-direction:column;gap:6px}
.card li a{text-decoration:none;font-size:15px;color:var(--ink)}.card li a:hover{color:var(--green-2)}
.card li.more a{color:var(--green-2);font-weight:600;font-size:14px}
.contact{text-align:center;padding:30px 20px 70px}.contact h2{font-size:24px}.contact p{color:var(--muted);margin-top:6px}

/* article layout */
.layout{max-width:1320px;margin:0 auto;display:grid;grid-template-columns:260px minmax(0,1fr) 220px;gap:40px;padding:0 20px}
.side{position:sticky;top:64px;height:calc(100vh - 64px);overflow:auto;padding:24px 0 40px}
.nsec{margin-bottom:6px}
.nsec summary{cursor:pointer;font-weight:600;font-size:14px;padding:6px 8px;border-radius:8px;list-style:none}
.nsec summary::-webkit-details-marker{display:none}
.nsec summary:hover{background:#eef2ee}
.nsec ul{list-style:none;margin:2px 0 8px 14px;border-left:2px solid var(--line);padding-left:6px}
.nsec li a{display:block;font-size:14px;padding:5px 10px;border-radius:7px;text-decoration:none;color:var(--muted)}
.nsec li a:hover{color:var(--ink);background:#eef2ee}
.nsec li a.on{color:var(--green);background:var(--mint-soft);font-weight:600}
.doc{padding:34px 0 80px;min-width:0}
.crumb{font-size:13px;color:var(--muted)}.crumb a{color:var(--muted);text-decoration:none}
.doc h1{font-size:clamp(30px,4vw,40px);margin:6px 0 8px}
.lede{color:var(--muted);font-size:18px;margin-bottom:22px}
.doc h2{font-size:24px;margin:40px 0 12px;padding-top:6px}
.doc h3{font-size:18px;margin:26px 0 8px}
.doc p,.doc ul,.doc ol{margin:0 0 14px}
.doc ul,.doc ol{padding-left:24px}.doc li{margin:4px 0}
.doc code{font:13px ui-monospace,Consolas,monospace;background:#eef2ee;padding:1px 6px;border-radius:5px}
.doc blockquote{border-left:4px solid var(--mint);background:#f0faf4;padding:12px 16px;border-radius:0 10px 10px 0;margin:0 0 16px;color:#1f3b2b}
.doc blockquote p:last-child{margin:0}
.tw{overflow-x:auto;margin:0 0 18px;border:1px solid var(--line);border-radius:12px;background:#fff}
.doc table{width:100%;border-collapse:collapse;font-size:15px}
.doc th{text-align:left;background:#f6f9f6;font-size:13px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);padding:10px 14px;border-bottom:1px solid var(--line)}
.doc td{padding:10px 14px;border-bottom:1px solid #eef2ee;vertical-align:top}
.doc tr:last-child td{border-bottom:0}
.doc td:first-child{font-weight:600;white-space:nowrap}
figure{margin:6px 0 22px}
.doc img{max-width:100%;height:auto}
.zoom{display:block;width:100%;border:1px solid var(--line);border-radius:12px;overflow:hidden;cursor:zoom-in;background:#fff;padding:0;box-shadow:var(--shadow)}
.zoom img{display:block;width:100%;height:auto}
figcaption{font-size:13px;color:var(--muted);margin-top:8px;text-align:center}
.pn{display:flex;justify-content:space-between;gap:12px;margin-top:48px}
.pn a{flex:1;max-width:48%;border:1px solid var(--line);background:#fff;border-radius:12px;padding:12px 16px;text-decoration:none;color:var(--ink);font-weight:600}
.pn a:hover{border-color:var(--green-2)}.pn small{display:block;color:var(--muted);font-weight:500;font-size:12px}.pn .nx{text-align:right;margin-left:auto}
.still{margin-top:28px;padding:16px 18px;border-radius:12px;background:var(--mint-soft);font-size:15px}
.toc{position:sticky;top:64px;align-self:start;padding:34px 0;font-size:13px}
.toc b{display:block;margin-bottom:8px;font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}
.toc ul{list-style:none;border-left:2px solid var(--line)}
.toc a{display:block;padding:4px 12px;color:var(--muted);text-decoration:none;margin-left:-2px;border-left:2px solid transparent}
.toc a:hover{color:var(--ink)}.toc a.on{color:var(--green);border-left-color:var(--green-2);font-weight:600}
@media(max-width:1180px){.layout{grid-template-columns:240px minmax(0,1fr)}.toc{display:none}}
@media(max-width:860px){
  .layout{grid-template-columns:1fr;gap:0}
  .menu{display:block}
  .side{display:none;position:fixed;inset:64px 0 0 0;height:auto;background:var(--bg);z-index:25;padding:16px 20px}
  body.nav-open .side{display:block}
  .doc{padding-top:22px}
}

/* search */
.search{position:fixed;inset:0;z-index:60;background:rgba(10,28,20,.45);display:flex;justify-content:center;align-items:flex-start;padding:10vh 16px 16px}
.search[hidden]{display:none}
.sbox{width:min(680px,100%);background:#fff;border-radius:16px;box-shadow:0 30px 80px -20px rgba(0,0,0,.45);overflow:hidden;display:flex;flex-direction:column;max-height:78vh}
.sin{display:flex;align-items:center;gap:10px;padding:14px 16px;border-bottom:1px solid var(--line)}
.sin input{flex:1;border:0;outline:none;font:inherit;font-size:18px;background:none;color:var(--ink)}
.res{overflow:auto;padding:8px}
.r{display:block;padding:10px 12px;border-radius:10px;text-decoration:none;color:var(--ink)}
.r.sel,.r:hover{background:var(--mint-soft)}
.r small{display:block;color:var(--muted);font-size:12px}
.r b{font-weight:600}.r .h{color:var(--green)}
.r p{font-size:13px;color:var(--muted);margin-top:2px;overflow:hidden;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
.r mark{background:#fef08a;color:inherit;border-radius:3px;padding:0 1px}
.empty{padding:22px;text-align:center;color:var(--muted);font-size:15px}
.lightbox{position:fixed;inset:0;z-index:70;background:rgba(10,20,15,.85);display:flex;align-items:center;justify-content:center;padding:24px;cursor:zoom-out}
.lightbox[hidden]{display:none}
.lightbox img{max-width:100%;max-height:100%;border-radius:10px;box-shadow:0 30px 80px rgba(0,0,0,.5)}