:root {
  --ink: #1b1f2a;
  --muted: #5b6270;
  --line: #e4e7ec;
  --accent: #1f4ed8;
  --bg: #ffffff;
  --soft: #f6f7f9;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
}

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

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px;
}

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 0;
  flex-wrap: wrap;
}

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

nav ul {
  list-style: none;
  display: flex;
  gap: 20px;
  margin: 0;
  padding: 0;
}

nav a { color: var(--muted); text-decoration: none; font-size: 15px; }
nav a:hover, nav a[aria-current="page"] { color: var(--ink); }

main { padding: 48px 0 64px; }

h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 12px; }
h2 { font-size: 1.3rem; margin: 40px 0 10px; }
h3 { font-size: 1.05rem; margin: 24px 0 6px; }

p.lead { font-size: 1.15rem; color: var(--muted); margin: 0 0 32px; }

a { color: var(--accent); }

.card {
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px 22px;
  margin: 24px 0;
}

.meta { color: var(--muted); font-size: 0.95rem; }

ul.clean { padding-left: 20px; }
ul.clean li { margin: 6px 0; }

footer {
  border-top: 1px solid var(--line);
  padding: 24px 0 40px;
  color: var(--muted);
  font-size: 14px;
}

footer ul {
  list-style: none;
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  margin: 8px 0 0;
  padding: 0;
}

footer a { color: var(--muted); }

@media (max-width: 520px) {
  body { font-size: 16px; }
  h1 { font-size: 1.6rem; }
}