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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: #f5f6f8;
  color: #1f2937;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-header {
  background: #1f2937;
  color: #fff;
  padding: 2.5rem 1.5rem;
  text-align: center;
}

.site-header h1 {
  font-size: 2.5rem;
  letter-spacing: 0.5px;
}

.site-header .tagline {
  margin-top: 0.4rem;
  color: #9ca3af;
}

.content {
  flex: 1;
  max-width: 760px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  display: grid;
  gap: 1.25rem;
}

.card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 1.5rem;
}

.card h2 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
  color: #111827;
}

.intro p {
  color: #4b5563;
}

ul {
  list-style: none;
}

ul li {
  padding: 0.35rem 0;
}

a {
  color: #2563eb;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-footer {
  text-align: center;
  padding: 1.5rem;
  color: #6b7280;
  font-size: 0.875rem;
}