* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  background: #0f172a;
  color: #f8fafc;
}

.site-header,
main,
footer {
  width: min(900px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  padding: 5rem 0 2rem;
}

.eyebrow {
  color: #93c5fd;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

h1 {
  max-width: 850px;
  font-size: clamp(2.2rem, 6vw, 4.5rem);
  line-height: 1.05;
  margin: 0;
}

.lead {
  max-width: 700px;
  font-size: 1.2rem;
  color: #cbd5e1;
}

.card {
  background: #1e293b;
  border: 1px solid #334155;
  border-radius: 1rem;
  padding: 1.5rem;
  margin: 1.25rem 0;
}

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

a {
  color: #93c5fd;
}

footer {
  padding: 2rem 0;
  color: #94a3b8;
}
.main-nav {
  align-items: center;
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
}

.main-nav a {
  text-decoration: none;
  padding: 0.7rem 1rem;
  border-radius: 0.6rem;
  background: #1e293b;
  border: 1px solid #334155;
  transition: background 0.2s ease;
}

.main-nav a:hover {
  background: #334155;
}