:root{
  --ink:#0B1220;--body:#4B5565;--soft:#8A94A6;--line:#E4E8EF;
  --surface:#F7F9FC;--blue:#1D4ED8;--blue-tint:#EEF3FE;
  --display:'Archivo',system-ui,sans-serif;
  --sans:'IBM Plex Sans',system-ui,sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,monospace;
}
*{margin:0;padding:0;box-sizing:border-box}
body{background:#fff;color:var(--body);font-family:var(--sans);font-size:16.5px;line-height:1.68;-webkit-font-smoothing:antialiased}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:2px solid var(--blue);outline-offset:3px}
.shell{max-width:1120px;margin:0 auto;padding:0 32px}
.narrow{max-width:760px;margin:0 auto;padding:0 32px}

.brand{display:inline-flex;align-items:center;gap:10px;font-family:var(--display);font-size:19px;letter-spacing:-0.025em;color:var(--ink);text-decoration:none}
.brand:hover{text-decoration:none}
.brand-text{font-weight:600}
.brand-text b{font-weight:800;color:var(--blue)}
.mark{width:28px;height:28px;border-radius:8px;background:var(--blue);position:relative;flex:none}
.mark::before{content:"";position:absolute;inset:6px 9px 9px 6px;border:2.6px solid #fff;border-radius:50%}
.mark::after{content:"";position:absolute;right:5.5px;bottom:5.5px;width:9px;height:2.6px;background:#fff;border-radius:2px;transform:rotate(45deg)}

.topbar{border-bottom:1px solid var(--line)}
.topbar-in{display:flex;align-items:center;justify-content:space-between;padding:16px 0}
.topnav{display:flex;gap:26px;font-size:15px}
.topnav a{color:var(--body);font-weight:500;text-decoration:none}
.topnav a:hover{color:var(--blue)}

.doc{padding:64px 0 40px}
.doc h1{font-family:var(--display);font-weight:800;font-size:clamp(32px,4.4vw,44px);letter-spacing:-0.032em;color:var(--ink);line-height:1.06;margin-bottom:10px}
.stamp{font-size:14px;color:var(--soft);margin-bottom:14px}
.intro{font-size:18px;margin-bottom:30px}

.toc{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:20px 24px;margin-bottom:44px}
.toc h2{font-family:var(--display);font-size:13px;font-weight:700;letter-spacing:0.08em;text-transform:uppercase;color:var(--ink);margin-bottom:12px}
.toc ol{margin:0;padding-left:20px;display:grid;gap:6px;font-size:15.5px}

h2.sec{font-family:var(--display);font-weight:700;font-size:21px;color:var(--ink);letter-spacing:-0.02em;margin:40px 0 12px;scroll-margin-top:24px}
h3.sub{font-family:var(--display);font-weight:600;font-size:17px;color:var(--ink);margin:24px 0 8px}
p{margin-bottom:14px}
ul,ol.list{margin:0 0 16px 0;padding-left:0;list-style:none}
ul li,ol.list li{padding-left:22px;position:relative;margin-bottom:8px}
ul li::before{content:"";position:absolute;left:0;top:11px;width:8px;height:2px;background:var(--blue);border-radius:2px}
strong{color:var(--ink);font-weight:600}

.callout{background:var(--blue-tint);border:1px solid #CFDCFB;border-radius:12px;padding:20px 24px;margin:26px 0}
.callout p:last-child{margin-bottom:0}
.callout strong{color:var(--ink)}

.foot{border-top:1px solid var(--line);background:var(--surface);padding:40px 0 56px;margin-top:64px}
.foot-in{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;align-items:center;margin-bottom:24px}
.foot-links{display:flex;gap:22px;font-size:15px;flex-wrap:wrap}
.foot-links a{color:var(--body);text-decoration:none}
.foot-links a:hover{color:var(--blue)}
.foot-base{border-top:1px solid var(--line);padding-top:22px;font-size:13.5px;color:var(--soft);line-height:1.7}
.foot-base strong{color:var(--body);font-weight:500}

@media (max-width:620px){
  .shell,.narrow{padding:0 22px}
  .topnav{display:none}
}