:root{
  --bg:#fffaf3;--bg-alt:#f6ede0;--card:#ffffff;--text:#2a211b;--muted:#5b4f45;--line:#e3d5c3;
  --accent:#b3261e;--on-accent:#ffffff;--link:#9c1f18;--code-bg:#f1e6d6;--focus:#1a56db;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
@media (prefers-color-scheme:dark){
  :root{--bg:#17120f;--bg-alt:#201a16;--card:#251e19;--text:#f3ebe2;--muted:#c4b8ab;--line:#3b3129;
  --accent:#e0584f;--on-accent:#1a0f0d;--link:#ff9a92;--code-bg:#2d251f;--focus:#8ab4ff}
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--sans);font-size:1.0625rem;line-height:1.65}
.wrap{max-width:62rem;margin:0 auto;padding:0 16px}
a{color:var(--link);text-underline-offset:2px}
a:focus-visible,summary:focus-visible,.btn:focus-visible{outline:3px solid var(--focus);outline-offset:2px}
.skip{position:absolute;left:-999px;top:0;background:var(--card);padding:8px 12px;z-index:10}
.skip:focus{left:8px;top:8px}
.site-header{border-bottom:1px solid var(--line);background:var(--bg);position:sticky;top:0;z-index:5}
.bar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:6px 16px;padding-top:10px;padding-bottom:10px}
.brand{display:flex;align-items:center;gap:8px;font-weight:700;font-size:1.15rem;color:var(--text);text-decoration:none}
nav{display:flex;flex-wrap:wrap;gap:2px 4px}
nav a{padding:6px 10px;border-radius:8px;color:var(--text);text-decoration:none;font-size:.95rem}
nav a:hover{background:var(--bg-alt)}
nav a[aria-current=page]{background:var(--bg-alt);font-weight:700}
nav a.lang{border:1px solid var(--line)}
.hero{padding:44px 0 36px;background:var(--bg-alt);border-bottom:1px solid var(--line)}
.eyebrow{margin:0 0 8px;font-size:.85rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);font-weight:600}
h1{font-size:clamp(1.85rem,6vw,2.9rem);line-height:1.2;margin:0 0 14px;letter-spacing:-.01em}
h2{font-size:clamp(1.4rem,4.5vw,1.85rem);line-height:1.3;margin:0 0 16px}
h3{font-size:1.1rem;margin:20px 0 8px}
.lede{font-size:1.15rem;max-width:46rem;margin:0 0 20px}
.note{font-size:.95rem;color:var(--muted);margin:0}
.cta{display:flex;flex-wrap:wrap;gap:10px;margin:0}
.btn{display:inline-block;padding:10px 18px;border-radius:10px;border:1px solid var(--line);background:var(--card);color:var(--text);text-decoration:none;font-weight:600}
.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}
.btn:hover{filter:brightness(.96)}
.section{padding:40px 0}
.section.alt{background:var(--bg-alt);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
ul,ol{padding-left:1.3rem;margin:0 0 16px}
li{margin:6px 0}
p{margin:0 0 14px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(22rem,1fr));gap:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px 18px}
.card h3{margin-top:0}
.card p{margin:0;color:var(--muted)}
code{font-family:var(--mono);font-size:.9em;background:var(--code-bg);padding:1px 6px;border-radius:5px;overflow-wrap:anywhere}
pre{background:var(--code-bg);border:1px solid var(--line);border-radius:10px;padding:14px;overflow-x:auto;margin:0 0 16px}
pre code{background:none;padding:0;white-space:pre;overflow-wrap:normal}
.chips code{display:inline-block;margin:3px 2px;padding:4px 10px}
.steps{counter-reset:s;list-style:none;padding:0}
.steps li{counter-increment:s;position:relative;padding:12px 14px 12px 52px;background:var(--card);border:1px solid var(--line);border-radius:12px;margin:10px 0}
.steps li::before{content:counter(s);position:absolute;left:14px;top:12px;width:26px;height:26px;border-radius:50%;background:var(--accent);color:var(--on-accent);text-align:center;line-height:26px;font-weight:700;font-size:.9rem}
.tablewrap{overflow-x:auto;margin:0 0 16px}
table{border-collapse:collapse;width:100%;background:var(--card);border:1px solid var(--line);font-size:.97rem}
th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}
thead th{background:var(--bg-alt)}
tbody th{font-weight:600;width:32%}
.faq{background:var(--card);border:1px solid var(--line);border-radius:10px;margin:10px 0;padding:0}
.faq summary{cursor:pointer;padding:12px 16px;font-weight:600}
.faq p{padding:0 16px;margin:0 0 14px}
.diagram{margin:20px 0}
.diagram svg{width:100%;height:auto;max-width:640px;display:block}
.diagram figcaption,.cap{font-size:.9rem;color:var(--muted);margin-top:6px}
.d-box,.d-in{fill:var(--card);stroke:var(--line);stroke-width:1.5}
.d-main{fill:var(--bg);stroke:var(--accent);stroke-width:2}
.d-t,.d-t2,.d-h{fill:var(--text);font:600 14px var(--sans)}
.d-t2{font-size:13px;font-weight:500}.d-h{font-size:15px;fill:var(--link)}
.d-t3{fill:var(--muted);font:12px var(--sans)}
.d-line{stroke:var(--accent);stroke-width:2;fill:none}
.shots{display:grid;grid-template-columns:2fr 1fr;gap:16px;align-items:start}
.shots img{width:100%;height:auto;border:1px solid var(--line);border-radius:10px;background:var(--card)}
.site-footer{border-top:1px solid var(--line);padding:24px 0 40px;color:var(--muted);font-size:.92rem}
.site-footer p{margin:0 0 8px}
@media (max-width:640px){
  body{font-size:1rem}
  .hero{padding:32px 0 28px}.section{padding:30px 0}
  .grid{grid-template-columns:1fr}
  .shots{grid-template-columns:1fr}
  .shots .mob{max-width:300px}
  tbody th{width:auto}
  .btn{width:100%;text-align:center}
}
td code,th code{white-space:nowrap;overflow-wrap:normal}
@media (max-width:640px){
  table,tbody,tr,th,td{display:block;width:auto}
  thead{position:absolute;left:-9999px}
  tr{border-bottom:1px solid var(--line);padding:8px 0}
  th,td{border:0;padding:3px 12px}
  tbody th{width:auto}
}