:root{
  --ink:#141519;--ink-2:#4a4d57;--ink-3:#7d818d;
  --line:#dcdee6;--line-2:#eceef3;--paper:#f7f7f4;--card:#fff;
  --mark:#e8503a;--mark-soft:#fdeeeb;--good:#1f7a4d;
  --shadow:0 1px 2px rgba(20,21,25,.04),0 4px 16px rgba(20,21,25,.06);
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  font-family:'Gothic A1',-apple-system,BlinkMacSystemFont,'Malgun Gothic',sans-serif;
  background:var(--paper);color:var(--ink);line-height:1.75;-webkit-font-smoothing:antialiased;
}
a{color:inherit}
a:focus-visible,button:focus-visible{outline:3px solid var(--mark);outline-offset:3px}
.top{border-bottom:1px solid var(--line);background:rgba(255,255,255,.96)}
.top-in{
  max-width:940px;margin:0 auto;padding:13px 24px;
  display:flex;align-items:center;justify-content:space-between;gap:24px;
}
.brand{display:flex;align-items:baseline;gap:9px;text-decoration:none;white-space:nowrap}
.brand b{font-weight:900;font-size:19px;letter-spacing:-.03em}
.brand span{
  font-family:'IBM Plex Mono',monospace;font-size:10px;font-weight:600;
  color:var(--ink-3);letter-spacing:.1em;text-transform:uppercase;
}
.nav{display:flex;align-items:center;gap:18px;font-size:12.5px;font-weight:700;color:var(--ink-2)}
.nav a{text-decoration:none}
.nav a:hover{text-decoration:underline}
.hero{max-width:800px;margin:0 auto;padding:58px 24px 28px}
.eyebrow{
  display:inline-block;margin-bottom:13px;
  font-family:'IBM Plex Mono',monospace;font-size:10.5px;font-weight:600;
  letter-spacing:.12em;text-transform:uppercase;color:var(--mark);
}
.hero h1{font-size:36px;line-height:1.3;letter-spacing:-.04em;font-weight:900;margin-bottom:16px}
.hero .lead{font-size:16.5px;line-height:1.75;color:var(--ink-2);max-width:700px}
.meta{
  display:flex;flex-wrap:wrap;gap:8px 18px;margin-top:20px;
  font-size:12px;color:var(--ink-3);
}
.layout{
  max-width:800px;margin:0 auto;padding:16px 24px 64px;
  display:grid;grid-template-columns:200px minmax(0,1fr);gap:40px;
}
.toc{align-self:start;position:sticky;top:20px}
.toc strong{
  display:block;margin-bottom:10px;
  font-family:'IBM Plex Mono',monospace;font-size:10px;letter-spacing:.1em;color:var(--ink-3);
}
.toc a{
  display:block;padding:5px 0;font-size:12.5px;color:var(--ink-2);text-decoration:none;
}
.toc a:hover{color:var(--mark)}
.article{min-width:0}
.article section{padding:28px 0;border-top:1px solid var(--line)}
.article section:first-child{border-top:0;padding-top:0}
.article h2{font-size:22px;letter-spacing:-.03em;line-height:1.4;margin-bottom:12px}
.article h3{font-size:16px;letter-spacing:-.02em;margin:20px 0 8px}
.article p{font-size:14.5px;color:var(--ink-2);margin:0 0 13px}
.article ul,.article ol{padding-left:22px;margin:10px 0 16px;color:var(--ink-2)}
.article li{font-size:14px;margin:7px 0;padding-left:2px}
.article a{color:#245f9b;text-underline-offset:3px}
.note{
  background:var(--mark-soft);border:1px solid #f2c8c1;border-radius:10px;
  padding:15px 17px;margin:18px 0;font-size:13.5px;color:#633229;
}
.tip{
  background:#eef7f2;border:1px solid #cbe3d5;border-radius:10px;
  padding:15px 17px;margin:18px 0;font-size:13.5px;color:#28543e;
}
.checklist{list-style:none!important;padding-left:0!important}
.checklist li{position:relative;padding-left:27px}
.checklist li::before{
  content:'✓';position:absolute;left:0;top:0;color:var(--good);font-weight:900;
}
table{width:100%;border-collapse:collapse;margin:16px 0 20px;font-size:13px;background:var(--card)}
th,td{padding:11px 12px;border:1px solid var(--line);text-align:left;vertical-align:top}
th{background:#f1f2f5;font-weight:800}
.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:18px 0}
.card{
  display:block;background:var(--card);border:1px solid var(--line);border-radius:11px;
  padding:17px;text-decoration:none;box-shadow:var(--shadow);
}
.card:hover{border-color:var(--ink)}
.card b{display:block;font-size:15px;margin-bottom:5px}
.card span{display:block;font-size:12.5px;color:var(--ink-2);line-height:1.6}
.cta{
  display:flex;align-items:center;justify-content:space-between;gap:18px;
  background:var(--ink);color:#fff;border-radius:12px;padding:20px;margin-top:26px;
}
.cta p{color:#d5d7de;margin:4px 0 0;font-size:12.5px}
.cta a{
  flex:0 0 auto;background:var(--mark);color:#fff;border-radius:8px;
  padding:10px 14px;text-decoration:none;font-size:13px;font-weight:800;
}
.source-list{font-size:12.5px!important}
.source-list li{font-size:12.5px;color:var(--ink-3)}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:9px;margin:9px 0;padding:13px 15px}
.faq summary{cursor:pointer;font-size:14px;font-weight:800}
.faq details p{margin:10px 0 0;font-size:13.5px}
footer{
  max-width:940px;margin:0 auto;padding:24px 24px 48px;border-top:1px solid var(--line);
  font-size:12.5px;color:var(--ink-3);
}
.flinks{display:flex;flex-wrap:wrap;gap:8px 16px;margin-bottom:9px}
.flinks a{color:var(--ink-2);font-weight:700;text-decoration:none}
.flinks a:hover{text-decoration:underline}
@media(max-width:720px){
  .top-in{padding:12px 18px;align-items:flex-start;flex-direction:column;gap:8px}
  .nav{gap:13px;flex-wrap:wrap}
  .hero{padding:40px 18px 22px}
  .hero h1{font-size:28px}
  .layout{display:block;padding:10px 18px 50px}
  .toc{position:static;margin-bottom:25px;padding:14px;border:1px solid var(--line);border-radius:9px;background:#fff}
  .toc a{display:inline-block;margin-right:12px}
  .cards{grid-template-columns:1fr}
  .cta{align-items:flex-start;flex-direction:column}
  footer{padding-left:18px;padding-right:18px}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}