:root {
  /* Colors selected from list: #2980B9 (Blue), #27AE60 (Green), #ECF0F1 (Light), #2C3D4F (Dark) */
  --primary-color: #2980B9;
  --secondary-color: #27AE60;
  --accent-color: #3498DB;
  --light-color: #ECF0F1;
  --dark-color: #2C3D4F;
  --gradient-primary: linear-gradient(135deg, #2980B9 0%, #27AE60 100%);
  --hover-color: #1F618D;
  --background-color: #FFFFFF;
  --text-color: #34495D;
  --border-color: rgba(41, 128, 185, 0.2);
  --divider-color: rgba(44, 61, 79, 0.1);
  --shadow-color: rgba(44, 61, 79, 0.1);
  --highlight-color: #F1C40F; /* Complementary Yellow */
  --main-font: 'Open Sans', sans-serif;
  --alt-font: 'Montserrat', sans-serif;
}

/* Background Pattern SVG */
body {
    background-color: var(--background-color);
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%232980b9' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

/* Utility Classes linking to Variables */
.bg-primary { background-color: var(--primary-color); }
.bg-secondary { background-color: var(--secondary-color); }
.bg-light { background-color: var(--light-color); }
.bg-dark { background-color: var(--dark-color); }
.text-primary { color: var(--primary-color); }
.text-dark { color: var(--dark-color); }
.text-highlight { color: var(--highlight-color); }
.font-heading { font-family: var(--alt-font); }
.font-body { font-family: var(--main-font); }
.border-theme { border-color: var(--border-color); }

.btn-custom {
    background: var(--gradient-primary);
    color: white;
    transition: all 0.3s ease;
}
.btn-custom:hover {
    background: var(--hover-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 6px var(--shadow-color);
}