:root {
  color-scheme: light dark;
  --primary: #1746a2;
  --on-primary: #ffffff;
  --background: #f5f7fa;
  --surface: #ffffff;
  --text: #142033;
  --muted: #526174;
  --border: #d9e0e8;
  --focus: #0a67d0;
}

@media (prefers-color-scheme: dark) {
  :root {
    --primary: #7ea6ff;
    --on-primary: #07152f;
    --background: #0b1220;
    --surface: #111b2d;
    --text: #f2f6fc;
    --muted: #bac6d6;
    --border: #344158;
    --focus: #9cc7ff;
  }
}

* { box-sizing: border-box; }

html { font-family: "Inter Variable", "IBM Plex Sans", system-ui, sans-serif; }

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  line-height: 1.6;
}

a { color: var(--primary); }
a:focus-visible, button:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }

.site-header {
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 94%, transparent);
}

.nav, main, footer {
  width: min(100% - 32px, 960px);
  margin-inline: auto;
}

.nav {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand { color: var(--text); font-weight: 700; text-decoration: none; }
.nav-links { display: flex; flex-wrap: wrap; gap: 16px; }
.nav-links a { color: var(--muted); text-decoration: none; }
.nav-links a:hover { color: var(--text); }

main { padding: 56px 0 72px; }
h1 { max-width: 720px; margin: 0 0 16px; font-size: clamp(2rem, 7vw, 3.25rem); line-height: 1.08; }
h2 { margin-top: 40px; font-size: 1.35rem; }
p, li { max-width: 760px; }
.lead { color: var(--muted); font-size: 1.1rem; }

.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding: 0 18px;
  border: 1px solid var(--primary);
  border-radius: 8px;
  background: var(--primary);
  color: var(--on-primary);
  font-weight: 600;
  text-decoration: none;
}
.button.secondary { background: transparent; color: var(--primary); }

.link-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  margin-top: 48px;
}
.link-list a { padding: 20px; text-decoration: none; }
.link-list a + a { border-left: 1px solid var(--border); }
.link-list strong { display: block; color: var(--text); }
.link-list span { color: var(--muted); }

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

@media (max-width: 680px) {
  .nav { align-items: flex-start; flex-direction: column; padding: 16px 0; gap: 8px; }
  main { padding-top: 40px; }
  .link-list { grid-template-columns: 1fr; }
  .link-list a + a { border-left: 0; border-top: 1px solid var(--border); }
}