:root {
  --primary: #0f2a44;
  --secondary: #1e3a5f;
  --light: #f5f7fa;
  --dark: #111;
}

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

body {
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.6;
  color: var(--dark);
  background: #fff;
}

.container {
  width: 90%;
  max-width: 1100px;
  margin: auto;
}

/* Header */
.header {
  background: var(--primary);
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

.logo {
  font-size: 1.2rem;
  font-weight: bold;
}

nav a {
  color: #fff;
  margin-left: 1rem;
  text-decoration: none;
}

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

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  padding: 5rem 0;
  text-align: center;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.btn {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.75rem 1.5rem;
  background: #fff;
  color: var(--primary);
  text-decoration: none;
  border-radius: 4px;
  font-weight: bold;
}

.btn:hover {
  opacity: 0.9;
}

/* Sections */
.section {
  padding: 4rem 0;
}

.section.alt {
  background: var(--light);
}

.section h2 {
  text-align: center;
  margin-bottom: 2rem;
}

/* Grid */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.card {
  padding: 1.5rem;
  border: 1px solid #ddd;
  border-radius: 6px;
  background: #fff;
}

.card h3 {
  margin-bottom: 0.5rem;
}

/* Contact */
form {
  max-width: 500px;
  margin: auto;
  display: flex;
  flex-direction: column;
}

form input,
form textarea {
  margin-bottom: 1rem;
  padding: 0.75rem;
  font-size: 1rem;
}

.note {
  text-align: center;
  font-size: 0.85rem;
  margin-top: 1rem;
  color: #666;
}

/* Footer */
.footer {
  background: var(--primary);
  color: #fff;
  text-align: center;
  padding: 1.5rem 0;
}

/* Responsive */
@media (max-width: 600px) {
  .hero h1 {
    font-size: 2rem;
  }
}