:root {
    --background-color: #f8fafc;
    --text-color: #1a202c;
    --primary-color: #2563eb;
    --secondary-color: #4b5563;
    --border-color: #e2e8f0;
    --button-background: #2563eb;
    --button-text-color: #ffffff;
    --link-color: #2563eb;
    --hover-background: #e0e7ff;
}

body.dark-theme {
    --background-color: #121212;
    --text-color: #e0e0e0;
    --primary-color: #3b82f6; /* bright blue */
    --secondary-color: #9ca3af; /* lighter gray */
    --border-color: #2c2c2c;
    --button-background: #2563eb;
    --button-text-color: #e0e0e0;
    --link-color: #60a5fa;
    --hover-background: #1f2937; /* dark gray hover */
}