:root {
  --primary: #0B1F3A;
  --secondary: #3A7CA5;
  --accent: #6FB1E7;
  --text: #1C1C1C;
  --bg: #FFFFFF;
  --light: #F5F7FA;
}

body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  color: var(--text);
}

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

.section {
  padding: 90px 0;
}

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

/* Header */
.header {
  position: sticky;
  top: 0;
  background: white;
  z-index: 10;
  border-bottom: 1px solid #eee;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 0;
}

.logo {
  height: 50px;
}

nav a {
  margin-left: 20px;
  text-decoration: none;
  color: var(--text);
}

/* Hero */
.hero {
  position: relative;
  height: 90vh;
  background: url('https://images.unsplash.com/photo-1581091215367-59ab6b1c3d0b?q=80') center/cover;
  display: flex;
  align-items: center;
}

.overlay {
  position: absolute;
  inset: 0;
  background: rgba(11, 31, 58, 0.75);
}

.hero-content {
  position: relative;
  color: white;
  max-width: 600px;
}

.hero h1 {
  font-size: 3rem;
}

/* Buttons */
.btn {
  display: inline-block;
  margin-top: 20px;
  background: var(--accent);
  padding: 12px 24px;
  text-decoration: none;
  color: black;
  font-weight: 600;
  transition: 0.3s;
}

.btn:hover {
  transform: translateY(-2px);
}

/* Grid */
.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.card {
  background: white;
  padding: 30px;
  border: 1px solid #eee;
  transition: 0.3s;
}

.card.hover:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

/* Animations */
.fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition: 0.6s ease;
}

.fade-up.show {
  opacity: 1;
  transform: translateY(0);
}

/* Footer */
.footer {
  background: var(--primary);
  color: white;
  text-align: center;
  padding: 30px 0;
}

/* Responsive */
@media (max-width: 768px) {
  .grid {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 2rem;
  }

  nav {
    display: none;
  }
}