:root {
  --bg: #f4f7f6;
  --surface: #ffffff;
  --ink: #14201e;
  --muted: #5a6b67;
  --accent: #0f766e;
  --line: #d7e2df;
  --max: 44rem;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(15, 118, 110, 0.12), transparent 60%),
    radial-gradient(900px 400px at 100% 0%, rgba(20, 80, 70, 0.08), transparent 55%),
    var(--bg);
  line-height: 1.65;
}
a { color: var(--accent); }
header {
  position: sticky;
  top: 0;
  backdrop-filter: blur(10px);
  background: rgba(244, 247, 246, 0.9);
  border-bottom: 1px solid var(--line);
}
.bar {
  max-width: calc(var(--max) + 3rem);
  margin: 0 auto;
  padding: 0.9rem 1.25rem;
  display: flex;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}
.brand {
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: var(--ink);
  font-size: 1.05rem;
}
.nav { display: flex; gap: 0.85rem; flex-wrap: wrap; align-items: center; }
.nav a {
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  font-size: 0.9rem;
  text-decoration: none;
  color: var(--muted);
}
.nav a:hover, .nav a[aria-current="page"] { color: var(--accent); }
main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1.5rem 1.4rem 2rem;
  box-shadow: 0 10px 30px rgba(20, 32, 30, 0.04);
}
.prose h1 {
  font-size: clamp(1.8rem, 4vw, 2.35rem);
  line-height: 1.2;
  margin: 0 0 0.5rem;
}
.prose h2 {
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  font-size: 1.15rem;
  margin-top: 2rem;
  color: var(--accent);
}
.prose h3 {
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  font-size: 1rem;
  margin-top: 1.25rem;
}
.prose p, .prose li { color: var(--ink); }
.prose ul { padding-left: 1.2rem; }
.prose hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 1.5rem 0;
}
.prose strong { color: var(--ink); }
footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem 3rem;
  color: var(--muted);
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  font-size: 0.85rem;
}
.hero-note {
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}
.home-links {
  display: grid;
  gap: 0.85rem;
  margin-top: 1.5rem;
}
.home-links a {
  display: block;
  text-decoration: none;
  padding: 1rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fbfcfb;
  color: var(--ink);
  font-family: "Avenir Next", "Segoe UI", sans-serif;
}
.home-links a:hover { border-color: var(--accent); }
.home-links span { display: block; color: var(--muted); font-size: 0.85rem; margin-top: 0.25rem; }

.bar.langs {
  padding-top: 0;
  border-top: 1px solid transparent;
}
.bar.langs .nav {
  flex-wrap: wrap;
  gap: 0.55rem 0.9rem;
  font-size: 0.9rem;
}
.bar.langs .nav a[aria-current="page"] {
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
}