:root {
  --text: #20252b;
  --muted: #66707a;
  --background: #f8fafb;
  --surface: #ffffff;
  --accent: #315f68;
  --border: #dfe6e8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background: var(--background);
  line-height: 1.6;
}

header,
main,
footer {
  width: min(900px, 90%);
  margin: auto;
}

header {
  padding: 80px 0 40px;
}

h1 {
  margin-bottom: 8px;
  font-size: clamp(2.2rem, 6vw, 4rem);
}

header p {
  color: var(--muted);
  font-size: 1.15rem;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 30px;
}

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

section {
  margin: 30px 0;
  padding: 32px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
}

footer {
  padding: 30px 0 50px;
  color: var(--muted);
}