:root {
  --navy: #0F172A;
  --teal: #0D9488;
  --sky: #0EA5E9;
  --wash: #F1F9FB;
  --text: #1E293B;
  --muted: #64748B;
  --border: #E2E8F0;
  --sos: #E11D48;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: #FFFFFF;
  line-height: 1.6;
}
a { color: var(--teal); }
header {
  background: var(--wash);
  border-bottom: 1px solid var(--border);
}
.wrap { max-width: 860px; margin: 0 auto; padding: 0 20px; }
.bar { display: flex; align-items: center; justify-content: space-between; padding: 14px 0; gap: 12px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand img { width: 40px; height: 40px; }
.brand b { display: block; color: var(--navy); font-size: 20px; line-height: 1; }
.brand span { display: block; color: var(--teal); font-size: 10px; letter-spacing: .3em; font-weight: 700; margin-top: 3px; }
nav a { margin-left: 16px; font-size: 14px; text-decoration: none; color: var(--muted); }
nav a:hover { color: var(--teal); }
.hero { text-align: center; padding: 56px 0 40px; }
.hero img { width: 128px; height: 128px; border-radius: 28px; box-shadow: 0 12px 32px rgba(13, 148, 136, .18); }
.hero h1 { color: var(--navy); font-size: 40px; margin: 24px 0 8px; line-height: 1.15; }
.hero p { color: var(--muted); font-size: 18px; max-width: 560px; margin: 0 auto; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; padding: 24px 0 48px; }
.card { border: 1px solid var(--border); border-radius: 16px; padding: 20px; }
.card h3 { margin: 0 0 6px; color: var(--navy); }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.card.sos { border-color: #FBCFE8; background: #FFF1F2; }
.card.sos h3 { color: var(--sos); }
main.doc { padding: 32px 0 56px; }
main.doc h1 { color: var(--navy); margin-bottom: 4px; }
main.doc .updated { color: var(--muted); margin-top: 0; }
main.doc h2 { color: var(--navy); margin-top: 32px; font-size: 21px; }
main.doc li { margin: 4px 0; }
.note { background: var(--wash); border: 1px solid #CCEFEA; border-radius: 12px; padding: 14px 16px; }
.steps { counter-reset: s; list-style: none; padding: 0; }
.steps li { counter-increment: s; padding-left: 44px; position: relative; margin: 14px 0; }
.steps li::before {
  content: counter(s); position: absolute; left: 0; top: -2px; width: 30px; height: 30px; border-radius: 50%;
  background: var(--teal); color: #fff; display: grid; place-items: center; font-weight: 700;
}
footer { border-top: 1px solid var(--border); color: var(--muted); font-size: 14px; padding: 24px 0 40px; }
footer a { margin-right: 16px; }
@media (max-width: 560px) {
  .hero h1 { font-size: 30px; }
  nav a { margin-left: 10px; }
}