body {
  margin: 0;
  font-family: system-ui, Arial, sans-serif;
  background: #0b1220;
  color: #e5e7eb;
}

header {
  background: #0f172a;
  padding: 18px 40px;
  position: sticky;
  top: 0;
  border-bottom: 1px solid #1f2937;
}

nav a {
  color: #e5e7eb;
  margin-right: 18px;
  text-decoration: none;
  font-weight: 500;
}

nav a:hover {
  color: #60a5fa;
}

.container {
  max-width: 1100px;
  margin: auto;
  padding: 60px 40px;
}

.hero {
  padding: 90px 40px;
  background: linear-gradient(135deg, #0f172a, #111827);
}

h1, h2, h3 {
  margin-top: 0;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

.card {
  background: #111827;
  border: 1px solid #1f2937;
  padding: 20px;
  border-radius: 10px;
}

button, .btn {
  background: #2563eb;
  color: white;
  padding: 10px 14px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

button:hover {
  background: #1d4ed8;
}

input, textarea {
  width: 100%;
  padding: 10px;
  margin-top: 8px;
  margin-bottom: 16px;
  background: #0f172a;
  border: 1px solid #1f2937;
  color: white;
  border-radius: 6px;
}