:root {
  --color-transport-blue: #003366;
  --color-indonesian-red: #DC143C;
  --color-transport-gold: #FFD700;
  --color-charcoal: #2C3E50;
  --color-medium-gray: #7F8C8D;
  --color-light-gray: #ECF0F1;
  --color-border-gray: #BDC3C7;
}

/* Base styles */
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: white;
  color: var(--color-charcoal);
}

/* Header */
header {
  background-color: var(--color-transport-blue);
  color: white;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* Navigation */
nav a {
  color: white;
  transition: color 0.3s;
}

nav a:hover {
  color: var(--color-transport-gold);
}

/* Buttons */
.btn-primary {
  background-color: var(--color-indonesian-red);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 0.375rem;
  transition: background-color 0.3s;
}

.btn-primary:hover {
  background-color: #B91C3C;
}

/* Cards */
.card {
  background-color: white;
  border: 1px solid var(--color-border-gray);
  border-radius: 0.5rem;
  padding: 1.5rem;
  margin-bottom: 1rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

/* Hero section */
.bg-gradient-to-r {
  background: linear-gradient(to right, var(--color-transport-blue), #1a3a66);
}

/* Responsive */
@media (max-width: 768px) {
  .hidden.md\:flex {
    display: none !important;
  }
  .md\:w-1/2 {
    width: 100% !important;
  }
}