:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --panel: #f5f7fa;
  --ink: #172542;
  --muted: #5b6577;
  --line: #e3e8ef;
  --accent: #2f6df6;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1320;
    --panel: #151c2c;
    --ink: #e9edf5;
    --muted: #97a3ba;
    --line: #232c40;
    --accent: #6f9bff;
  }
}

* { box-sizing: border-box; }

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

.bar {
  border-bottom: 1px solid var(--line);
  padding: 20px 24px;
}

.mark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: inherit;
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  background: var(--accent);
  display: inline-block;
}

.word {
  font-weight: 700;
  letter-spacing: 0.16em;
  font-size: 15px;
}

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

.hero {
  padding: 72px 0 48px;
  max-width: 620px;
}

h1 {
  margin: 0 0 16px;
  font-size: clamp(28px, 4.4vw, 42px);
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.015em;
}

.lead {
  margin: 0;
  font-size: 18px;
  color: var(--muted);
}

.grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  padding-bottom: 48px;
}

.grid article {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 22px;
}

.grid h2 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 600;
}

.grid p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.contact {
  border-top: 1px solid var(--line);
  padding: 32px 0 64px;
  color: var(--muted);
}

.contact p { margin: 0; }

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

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

footer p { margin: 0; }

.err {
  padding: 96px 0 120px;
  max-width: 560px;
}

.err .code {
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--muted);
  margin: 0 0 12px;
}