:root {
  --ink: #16232e;
  --ink-soft: #45586a;
  --bg: #f7f9fb;
  --card: #ffffff;
  --accent: #0f5e78;
  --accent-deep: #0a3d4f;
  --rule: #dde5ec;
  --max: 880px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  font-size: 17px;
}
header.site {
  background: linear-gradient(135deg, var(--accent-deep), var(--accent));
  color: #fff;
  padding: 0.9rem 1.25rem;
}
header.site .inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.brand { font-weight: 700; font-size: 1.15rem; letter-spacing: 0.02em; text-decoration: none; color: #fff; }
.brand span { opacity: 0.75; font-weight: 400; }
nav.top a { color: #dceaf1; text-decoration: none; margin-left: 1.1rem; font-size: 0.95rem; }
nav.top a:hover { color: #fff; text-decoration: underline; }
.hero {
  background: linear-gradient(135deg, var(--accent-deep), var(--accent));
  color: #fff;
  padding: 4.5rem 1.25rem 5rem;
  text-align: center;
}
.hero h1 { font-size: 2.4rem; line-height: 1.2; max-width: 720px; margin: 0 auto 1rem; }
.hero p { max-width: 640px; margin: 0 auto; font-size: 1.15rem; color: #d8e7ee; }
main { max-width: var(--max); margin: 0 auto; padding: 2.5rem 1.25rem 3.5rem; }
main.doc h1 { font-size: 1.9rem; margin-bottom: 0.35rem; }
.updated { color: var(--ink-soft); font-size: 0.9rem; margin-bottom: 1.8rem; }
main h2 { font-size: 1.25rem; margin: 1.9rem 0 0.6rem; color: var(--accent-deep); }
main p, main li { color: var(--ink-soft); }
main ul, main ol { padding-left: 1.4rem; margin: 0.5rem 0 1rem; }
main li { margin-bottom: 0.35rem; }
main a { color: var(--accent); }
strong { color: var(--ink); }
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.1rem;
  margin-top: -2.6rem;
}
.card {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 1.4rem 1.3rem;
  box-shadow: 0 6px 18px rgba(15, 45, 60, 0.07);
}
.card h3 { font-size: 1.05rem; margin-bottom: 0.4rem; color: var(--accent-deep); }
.card p { font-size: 0.95rem; color: var(--ink-soft); }
.section { margin-top: 3rem; }
.section h2 { font-size: 1.5rem; color: var(--ink); margin-bottom: 0.6rem; }
.notice {
  background: #eef4f8;
  border-left: 4px solid var(--accent);
  border-radius: 0 8px 8px 0;
  padding: 0.9rem 1.1rem;
  margin: 1.2rem 0;
  font-size: 0.95rem;
  color: var(--ink-soft);
}
footer.site {
  border-top: 1px solid var(--rule);
  background: #fff;
  padding: 1.8rem 1.25rem 2.2rem;
  font-size: 0.9rem;
  color: var(--ink-soft);
}
footer.site .inner { max-width: var(--max); margin: 0 auto; }
footer.site nav { margin-bottom: 0.7rem; display: flex; flex-wrap: wrap; gap: 0.4rem 1.2rem; }
footer.site a { color: var(--accent); text-decoration: none; }
footer.site a:hover { text-decoration: underline; }
@media (max-width: 560px) {
  .hero h1 { font-size: 1.7rem; }
  .hero { padding: 3rem 1.25rem 4rem; }
}