:root {
  --ink: #1c1f26;
  --muted: #5b6472;
  --line: #e4e7ec;
  --accent: #2f6f4f;
  --bg: #fbfbfa;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
}

header {
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.wrap {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 24px;
}

nav.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
}

.brand {
  font-weight: 700;
  font-size: 1.15rem;
  text-decoration: none;
  color: var(--ink);
  letter-spacing: -0.01em;
}

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

nav.topbar ul {
  list-style: none;
  display: flex;
  gap: 28px;
  margin: 0;
  padding: 0;
}

nav.topbar a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
}

nav.topbar a:hover, nav.topbar a[aria-current="page"] {
  color: var(--ink);
}

main { padding: 56px 0 80px; }

h1 {
  font-size: 2.1rem;
  margin: 0 0 12px;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.3rem;
  margin: 40px 0 12px;
}

p { color: var(--muted); margin: 0 0 16px; max-width: 62ch; }

.lede {
  font-size: 1.1rem;
  color: var(--ink);
  max-width: 60ch;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.card {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 20px;
  background: #fff;
}

.card h3 { margin: 0 0 8px; font-size: 1.02rem; }
.card p { margin: 0; font-size: 0.92rem; }

footer {
  border-top: 1px solid var(--line);
  padding: 28px 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.btn {
  display: inline-block;
  margin-top: 8px;
  padding: 10px 18px;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-size: 0.92rem;
}