* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Arial, sans-serif;
  background: #f1f5f9;
  color: #1e293b;
  line-height: 1.7;
}

header {
  background: #0f172a;
  color: white;
  padding: 64px 24px;
  text-align: center;
}

header h1 {
  margin: 12px 0;
  font-size: clamp(2rem, 6vw, 3.5rem);
  line-height: 1.2;
}

header p {
  color: #cbd5e1;
}

main {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 24px;
}

section {
  background: white;
  padding: 32px;
  margin-bottom: 24px;
  border-radius: 16px;
  box-shadow: 0 4px 16px rgb(15 23 42 / 6%);
}

h2 {
  margin-top: 0;
  color: #0f172a;
}

a {
  color: #0369a1;
}

.button,
button {
  display: inline-block;
  background: #0369a1;
  color: white;
  padding: 12px 22px;
  border: none;
  border-radius: 8px;
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}

.button:hover,
button:hover {
  background: #075985;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid #f59e0b;
  outline-offset: 4px;
}

footer {
  padding: 24px;
  text-align: center;
  color: #64748b;
}