:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --text: #14171f;
  --muted: #5b6475;
  --accent: #1f6feb;
  --accent-soft: #e8f0fe;
  --border: #e3e6ec;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1116;
    --surface: #171a21;
    --text: #e8eaef;
    --muted: #9aa3b5;
    --accent: #5b9bff;
    --accent-soft: #1b2638;
    --border: #262b36;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

.wrap { max-width: 960px; margin: 0 auto; padding: 0 16px; }

header { padding: 24px 0; }
header .wrap { display: flex; justify-content: space-between; align-items: center; }
.logo { font-weight: 700; font-size: 20px; color: var(--text); text-decoration: none; letter-spacing: -0.01em; }
.logo span { color: var(--accent); }
nav a { color: var(--muted); text-decoration: none; margin-left: 20px; font-size: 15px; }
nav a:hover { color: var(--text); }

.hero { padding: 64px 0 48px; }
.hero h1 { font-size: clamp(32px, 6vw, 48px); line-height: 1.15; margin: 0 0 16px; letter-spacing: -0.02em; }
.hero p { font-size: 18px; color: var(--muted); max-width: 620px; margin: 0; }

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; padding-bottom: 48px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 24px; }
.card h2 { font-size: 18px; margin: 0 0 8px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }

.contacts { background: var(--accent-soft); border-radius: 12px; padding: 32px; margin-bottom: 48px; }
.contacts h2 { margin: 0 0 12px; font-size: 22px; }
.contacts dl { display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; margin: 0; }
.contacts dt { color: var(--muted); }
.contacts dd { margin: 0; }

.doc { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 32px; margin: 16px 0 48px; }
.doc h1 { font-size: 28px; margin: 0 0 4px; }
.doc h2 { font-size: 19px; margin: 28px 0 8px; }
.doc .date { color: var(--muted); margin: 0 0 16px; }
.doc ul { padding-left: 20px; }

footer { border-top: 1px solid var(--border); padding: 24px 0; color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; }

@media (max-width: 480px) {
  nav a { margin-left: 12px; }
  .contacts, .doc { padding: 20px; }
  .contacts dl { grid-template-columns: 1fr; }
  .contacts dt { margin-top: 8px; }
}