:root {
  color-scheme: light dark;
  --bg: #f7faf9;
  --surface: #ffffff;
  --text: #14201d;
  --text-secondary: #52615d;
  --border: #dce5e2;
  --accent: #2b6e68;
  --accent-strong: #205954;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1715;
    --surface: #17211e;
    --text: #f1f6f4;
    --text-secondary: #b2c0bb;
    --border: #31403b;
    --accent: #7fc5bd;
    --accent-strong: #a3d8d2;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.page-nav,
main,
footer {
  width: min(100% - 40px, 760px);
  margin-inline: auto;
}

.page-nav {
  padding-top: 22px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.page-nav div {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

main { padding: 34px 0 68px; }
footer {
  padding: 22px 0 36px;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.9rem;
}

h1 { margin: 0 0 8px; font-size: clamp(2rem, 7vw, 2.75rem); line-height: 1.15; }
h2 { margin: 2em 0 0.45em; font-size: 1.2rem; line-height: 1.35; }
p, li { color: var(--text-secondary); }
a { color: var(--accent-strong); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
.page-nav a { font-weight: 650; }
.version { margin: 0 0 2em; font-size: 0.92rem; }
.lead { max-width: 62ch; font-size: 1.08rem; }

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
  margin-top: 32px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
}

.card h2 { margin-top: 0; }
.card p:last-child { margin-bottom: 0; }
.card-link { display: block; font-size: 1.05rem; font-weight: 700; }
.contact { font-size: 1.15rem; font-weight: 700; }

@media (max-width: 520px) {
  .page-nav { align-items: flex-start; flex-direction: column; }
  main { padding-top: 28px; }
}