:root{
  --paper:#F6F7F4;
  --ink:#17211E;
  --muted:#5A6662;
  --line:#DDE2DC;
  --blue:#2A62B5;
  --blue-ink:#1E4A8C;
  --yellow:#F2B90F;
  --card:#FFFFFF;
}
@media (prefers-color-scheme: dark){
  :root{
    --paper:#121816;
    --ink:#E9ECE7;
    --muted:#98A49E;
    --line:#28322E;
    --blue:#6FA0E8;
    --blue-ink:#8FB6F0;
    --yellow:#E8B41E;
    --card:#1A211F;
  }
}

*{box-sizing:border-box;margin:0;padding:0}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:"Instrument Sans", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  font-size:17px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
.wrap{max-width:680px;margin:0 auto;padding:0 24px}

header{padding:40px 0 0}
.mark{
  display:flex;align-items:center;gap:10px;
  font-family:"Bricolage Grotesque", "Avenir Next", system-ui, sans-serif;
  font-weight:800;font-size:1.15rem;letter-spacing:-0.01em;
}
.mark a{color:inherit;text-decoration:none}
.mark svg{display:block}

.crumb{margin-top:28px;font-size:.85rem;color:var(--muted)}
.crumb a{color:var(--blue);text-decoration:none}
.crumb a:hover{text-decoration:underline}

article{padding:20px 0 40px}
.article-logo{width:60px;height:60px;display:block;margin-top:12px}
article h1{
  font-family:"Bricolage Grotesque", "Avenir Next", system-ui, sans-serif;
  font-weight:800;
  font-size:clamp(1.9rem, 5vw, 2.6rem);
  line-height:1.12;
  letter-spacing:-0.02em;
  text-wrap:balance;
  margin-top:10px;
}
.ingress{margin-top:18px;font-size:1.08rem;color:var(--muted);max-width:56ch}
article h2{
  font-family:"Bricolage Grotesque", "Avenir Next", system-ui, sans-serif;
  font-weight:600;font-size:1.35rem;letter-spacing:-0.015em;
  margin-top:44px;
}
article h3{
  font-family:"Bricolage Grotesque", "Avenir Next", system-ui, sans-serif;
  font-weight:600;font-size:1.05rem;
  margin-top:28px;
}
article p{margin-top:14px;max-width:62ch}
article ul, article ol{margin-top:14px;padding-left:24px;max-width:60ch}
article li{margin-top:8px}
article a{color:var(--blue)}
article code{
  font-family:ui-monospace, "SF Mono", Menlo, monospace;
  font-size:.88em;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:5px;
  padding:2px 6px;
}
article pre{
  margin-top:14px;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:10px;
  padding:16px 18px;
  overflow-x:auto;
}
article pre code{background:none;border:none;padding:0}

.tips{
  margin-top:18px;
  background:var(--card);
  border:1px solid var(--line);
  border-left:3px solid var(--yellow);
  border-radius:10px;
  padding:16px 20px;
  max-width:62ch;
}
.tips strong{display:block;margin-bottom:6px}

.faq{margin-top:44px}
.faq details{border-bottom:1px solid var(--line);padding:4px 0 14px}
.faq summary{
  font-family:"Bricolage Grotesque", "Avenir Next", system-ui, sans-serif;
  font-weight:600;font-size:1.02rem;
  cursor:pointer;padding:12px 0 0;
  list-style-position:outside;
}
.faq summary:hover{color:var(--blue)}
.faq details p{margin-top:10px;color:var(--muted);max-width:60ch}

.cta-box{
  margin-top:48px;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:12px;
  padding:28px;
}
.cta-box h2{margin-top:0;font-size:1.25rem}
.cta-box p{color:var(--muted)}
.cta-box a.mail{
  display:inline-block;margin-top:16px;
  font-weight:600;color:var(--paper);
  background:var(--blue);
  padding:11px 22px;border-radius:8px;
  text-decoration:none;
}
.cta-box a.mail:hover{background:var(--blue-ink)}

.guide-list{margin-top:36px;display:flex;flex-direction:column;gap:0;list-style:none;padding:0}
.guide-list li{border-bottom:1px solid var(--line);padding:24px 0}
.guide-list h2{margin-top:0;font-size:1.25rem}
.guide-list a{color:inherit;text-decoration:none}
.guide-list a:hover h2{color:var(--blue)}
.guide-list p{color:var(--muted);margin-top:8px}

footer{
  border-top:1px solid var(--line);
  margin-top:40px;
  padding:32px 0 48px;
  font-size:.85rem;color:var(--muted);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
}
footer a{color:var(--muted)}