:root {
  --brand: #0e7c6b;
  --brand-dark: #0a5a4e;
  --ink: #1f2933;
  --ink-soft: #52606d;
  --bg: #f5f7f7;
  --card: #ffffff;
  --border: #e4e7eb;
  --max-width: 860px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
}

header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.9rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.logo {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.logo span { color: var(--brand); }

nav { display: flex; flex-wrap: wrap; gap: 0.25rem; }

nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.92rem;
  padding: 0.4rem 0.7rem;
  border-radius: 6px;
}

nav a:hover { background: var(--bg); color: var(--brand-dark); }

nav a.active {
  background: var(--brand);
  color: #fff;
  font-weight: 600;
}

.page-hero {
  background: linear-gradient(135deg, var(--brand-dark), var(--brand));
  color: #fff;
  padding: 2.5rem 1.25rem;
}

.page-hero .hero-inner { max-width: var(--max-width); margin: 0 auto; }

.page-hero h1 { font-size: 2rem; letter-spacing: -0.02em; }

.page-hero p { opacity: 0.85; margin-top: 0.35rem; font-size: 0.95rem; }

main {
  max-width: var(--max-width);
  margin: -1.25rem auto 3rem;
  padding: 0 1.25rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem 2.25rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.card + .card { margin-top: 1.5rem; }

.card h2 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
  color: var(--brand-dark);
}

.card h3 {
  font-size: 1.05rem;
  margin: 1.5rem 0 0.5rem;
}

.card p { margin: 0.75rem 0; color: var(--ink); }

.card ul, .card ol { margin: 0.75rem 0 0.75rem 1.5rem; }

.card li { margin: 0.35rem 0; }

.card a { color: var(--brand-dark); }

.lead { font-weight: 600; }

.note {
  background: var(--bg);
  border-left: 3px solid var(--brand);
  padding: 0.75rem 1rem;
  border-radius: 0 8px 8px 0;
  margin: 1rem 0;
  font-size: 0.95rem;
  color: var(--ink-soft);
}

footer {
  border-top: 1px solid var(--border);
  background: var(--card);
  padding: 1.5rem 1.25rem;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 0.88rem;
  color: var(--ink-soft);
}

.footer-inner nav a { font-size: 0.88rem; }

@media (max-width: 600px) {
  .page-hero h1 { font-size: 1.5rem; }
  .card { padding: 1.5rem 1.25rem; }
}