:root {
  --primary: #1e3a8a;
  --primary-light: #2563eb;
  --text: #0f172a;
  --muted: #475569;
  --bg: #ffffff;
  --hr: #e2e8f0;
  --footer-bg: #f8fafc;
  --radius: 8px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header */
header {
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  color: #fff;
  text-align: center;
  padding: 60px 20px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

header h1 {
  font-size: 2.2rem;
  font-weight: 600;
  margin-bottom: 10px;
}

header p {
  color: rgba(255, 255, 255, 0.85);
  font-size: 1.05rem;
}

/* Main Content */
main {
  max-width: 900px;
  margin: 50px auto;
  padding: 0 24px;
  flex: 1;
}

h2 {
  color: var(--primary);
  margin: 28px 0 10px;
  font-size: 1.25rem;
}

p, li {
  color: var(--muted);
  margin: 8px 0;
  font-size: 1rem;
}

ul {
  margin-left: 20px;
}

a {
  color: var(--primary-light);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

hr {
  border: none;
  height: 1px;
  background: var(--hr);
  margin: 32px 0;
}

/* Footer */
footer {
  background: var(--footer-bg);
  color: var(--muted);
  font-size: 0.9rem;
  padding: 40px 20px;
  text-align: center;
  border-top: 1px solid var(--hr);
  margin-top: auto;
}

footer a {
  color: var(--primary-light);
  text-decoration: none;
  font-weight: 500;
}

footer a:hover {
  text-decoration: underline;
}

/* Responsive */
@media (max-width: 600px) {
  header {
    padding: 40px 16px;
  }

  header h1 {
    font-size: 1.8rem;
  }

  main {
    margin: 32px auto;
    padding: 0 18px;
  }
}