body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: #f5f7fb;
  color: #1f2937;
}

header {
  background: #0f172a;
  color: #fff;
  padding: 16px 0;
}

.container {
  max-width: 1100px;
  margin: auto;
  padding: 0 20px;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav a {
  color: #fff;
  text-decoration: none;
  margin-left: 16px;
  font-weight: 500;
}

.hero {
  background: linear-gradient(135deg, #0f172a, #1e293b);
  color: #fff;
  padding: 60px 0;
}

.hero h1 {
  font-size: 36px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.card {
  background: #fff;
  padding: 24px;
  border-radius: 12px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.05);
}

footer {
  background: #0f172a;
  color: #cbd5f5;
  padding: 30px 0;
  margin-top: 40px;
  font-size: 14px;
}

footer a {
  color: #cbd5f5;
  text-decoration: none;
  margin-right: 12px;
}