:root {
  color-scheme: dark;
  --bg: #0a0a0a;
  --surface: #151515;
  --line: rgba(255, 255, 255, 0.12);
  --text: #f5f5f5;
  --muted: #a3a3a3;
  --accent: #5eead4;
}
* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
}

header, main, footer {
  width: min(900px, calc(100% - 40px));
  margin: 0 auto;
}

header { padding: 38px 0 54px; }

nav {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 72px;
  color: var(--muted);
}

a { color: inherit; }
nav a, footer a { text-decoration: none; }
.brand { color: var(--text); font-weight: 700; }

h1 {
  margin: 0 0 18px;
  font-size: clamp(40px, 7vw, 76px);
  line-height: 1;
  letter-spacing: -0.025em;
}

.lead { max-width: 760px; margin: 0; color: var(--muted); font-size: 18px; }

section { padding: 34px 0; border-top: 1px solid var(--line); }
h2 { margin: 0 0 12px; font-size: 23px; }
p { margin: 0; color: var(--muted); }
p + p { margin-top: 12px; }

.contact {
  margin-top: 34px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
}

footer {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  padding: 38px 0 48px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 640px) {
  nav { margin-bottom: 50px; }
}