:root {
  color-scheme: light dark;
  --bg: #f3f5f7;
  --surface: #ffffff;
  --text: #17202a;
  --muted: #66717d;
  --accent: #3457d5;
  --border: #dfe4ea;
}

* { box-sizing: border-box; }

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

header, main, footer {
  width: min(960px, calc(100% - 32px));
  margin: auto;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0;
}

.brand {
  color: var(--text);
  font-size: 20px;
  font-weight: 700;
  text-decoration: none;
}

nav a {
  color: var(--muted);
  margin-left: 20px;
  text-decoration: none;
}

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

.hero, .panel, .card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
}

.hero {
  padding: 56px;
  margin: 24px 0;
}

.hero h1 {
  max-width: 720px;
  margin: 0 0 16px;
  font-size: clamp(34px, 6vw, 58px);
  line-height: 1.08;
}

.hero p {
  max-width: 700px;
  color: var(--muted);
  font-size: 19px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin: 18px 0;
}

.card, .panel {
  padding: 28px;
}

.card h2, .panel h1, .panel h2 {
  margin-top: 0;
}

.card p, .panel p, li {
  color: var(--muted);
}

.card a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
}

footer {
  padding: 36px 0 50px;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 680px) {
  header { display: block; }
  nav { margin-top: 12px; }
  nav a { margin: 0 16px 0 0; }
  .hero { padding: 32px 24px; }
  .grid { grid-template-columns: 1fr; }
}