:root {
  --bg-dark: #0a0e14; /* Deep Navy background */
  --card-bg: #151b23; /* Slate/Midnight blue for the cards */
  --card-hover: #1c242f; /* Lighter blue-grey for hover */
  --accent: #4fc3f7; /* Electric Cyan / Sky Blue for titles and highlights */
  --text-main: #e6edf3;     
  --text-muted: #8b949e;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-main);
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  padding: 60px 20px;
}

h1 { 
  font-weight: 300; 
  letter-spacing: 1px; 
  margin-bottom: 8px;
}

p { 
  color: var(--text-muted); 
  margin-bottom: 50px; 
}

.nav-grid {
  display: grid;
  /* This creates a grid that fits as many 280px cards as it can */
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 25px;
  width: 100%;
  max-width: 900px;
}

.nav-card {
  background: var(--card-bg);
  border: 1px solid #333;
  border-radius: 12px;
  padding: 40px 20px;
  text-decoration: none;
  color: var(--text-main);
  text-align: center;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.nav-card:hover {
  background: var(--card-hover);
  border-color: var(--accent);
  transform: translateY(-8px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.icon {
  font-size: 2.5rem;
  /* Subtle glow on icons */
  filter: drop-shadow(0 0 5px rgba(0, 212, 255, 0.2));
}

.card-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--accent);
}

.card-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
}