:root{--ink:#14232b;--muted:#4b5b63;--line:#dbe5e7;--bg:#ffffff;--soft:#f3f8f8;--teal:#0f766e;--teal2:#0891b2;--btn:#0f766e;--btnink:#fff}
@media (prefers-color-scheme:dark){:root{--ink:#e6eef0;--muted:#a9b8bd;--line:#27363c;--bg:#0f171a;--soft:#152126;--teal:#5eead4;--teal2:#67e8f9;--btn:#14b8a6;--btnink:#05201d}}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.75 system-ui,-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif}
a{color:var(--teal)}a:focus-visible,summary:focus-visible{outline:2px solid var(--teal2);outline-offset:2px}
.wrap{max-width:1040px;margin:0 auto;padding:0 20px}
header{border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;gap:18px;min-height:60px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--ink);text-decoration:none}
.brand img{width:28px;height:28px}
nav{display:flex;gap:16px;flex-wrap:wrap;margin-left:auto;font-size:15px}nav a{color:var(--muted);text-decoration:none}nav a:hover{color:var(--teal)}
.crumb{font-size:14px;color:var(--muted);margin:18px 0 0}.crumb a{color:var(--muted)}
.hero{padding:40px 0 28px}
h1{font-size:clamp(30px,5vw,44px);line-height:1.2;margin:0 0 14px;letter-spacing:-.01em}
.lead{font-size:18px;color:var(--muted);max-width:760px;margin:0 0 22px}
.cta{display:inline-block;background:var(--btn);color:var(--btnink);text-decoration:none;font-weight:700;padding:12px 24px;border-radius:10px}
.cta:hover{filter:brightness(1.08)}
.alt{margin-left:16px;font-size:15px}
.note{font-size:14px;color:var(--muted);margin:16px 0 0;max-width:760px}.note.close{margin:0 0 16px}
section{padding:30px 0;border-top:1px solid var(--line)}
h2{font-size:24px;line-height:1.3;margin:0 0 16px}
ol.steps{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;counter-reset:s}
ol.steps li{counter-increment:s;background:var(--soft);border-radius:12px;padding:16px 18px}
ol.steps li::before{content:counter(s);display:inline-grid;place-items:center;width:28px;height:28px;border-radius:50%;background:var(--teal);color:var(--bg);font-weight:700;margin-bottom:8px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}
.card{border:1px solid var(--line);border-radius:12px;padding:16px 18px}
h3{font-size:17px;margin:0 0 6px}.card p,ol.steps p{margin:0;color:var(--muted);font-size:15px}
table{border-collapse:collapse;width:100%;font-size:15px}th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}th{color:var(--muted);font-weight:600}
code{font:14px/1.5 ui-monospace,SFMono-Regular,Consolas,monospace;background:var(--soft);padding:1px 6px;border-radius:5px}
.sample{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:18px;align-items:start}
.sample figure{margin:0}.sample img{width:100%;height:auto;border:1px solid var(--line);border-radius:10px;background:#fff}
figcaption{font-size:14px;color:var(--muted);margin-top:6px}
pre{background:var(--soft);border-radius:10px;padding:14px 16px;overflow:auto;font:13px/1.6 ui-monospace,SFMono-Regular,Consolas,monospace;margin:0;white-space:pre-wrap}
.links{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;list-style:none;padding:0;margin:0}
.links a{display:block;border:1px solid var(--line);border-radius:12px;padding:14px 16px;text-decoration:none;color:var(--ink)}.links a:hover{border-color:var(--teal)}
.links span{display:block;color:var(--muted);font-size:14px}
details{border-bottom:1px solid var(--line);padding:12px 0}summary{cursor:pointer;font-weight:600}details p{margin:8px 0 0;color:var(--muted)}
.prose p{max-width:780px;margin:0 0 12px}
footer{border-top:1px solid var(--line);padding:26px 0 40px;font-size:14px;color:var(--muted)}footer a{color:var(--muted)}
.foot{display:flex;gap:16px;flex-wrap:wrap;justify-content:space-between}
@media (max-width:600px){.alt{display:block;margin:12px 0 0}.hero{padding-top:28px}}