:root {
  --max: 900px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  line-height: 1.5;
  color: #111;
}

a { color: inherit; }

.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 16px;
}

.header {
  position: sticky;
  top: 0;
  background: white;
  border-bottom: 1px solid #eee;
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.2px;
}

.nav a {
  text-decoration: none;
  margin-left: 14px;
  opacity: 0.8;
}

.nav a:hover { opacity: 1; }

.hero {
  padding: 72px 0 40px;
}

.hero h1 {
  margin: 0 0 10px;
  font-size: 40px;
  line-height: 1.1;
}

.hero p {
  margin: 0 0 22px;
  font-size: 18px;
  opacity: 0.85;
}

.button {
  display: inline-block;
  padding: 10px 14px;
  border: 1px solid #111;
  border-radius: 10px;
  text-decoration: none;
}

.section {
  padding: 28px 0;
  border-top: 1px solid #f0f0f0;
}

.footer {
  border-top: 1px solid #eee;
  padding: 22px 0;
  margin-top: 30px;
  opacity: 0.8;
}