:root {
    --primary-color: #006400; /* Default Green */
    --secondary-color: #ffffff;
    --background-light: #f8f9fa;
    --background-dark: #121212;
    --text-dark: #333;
    --text-light: #fff;
    --border-radius: 15px;
    --shadow: 0 6px 18px rgba(0, 0, 0, 0.2);
}

/* Theme Color - Applied Globally */
body {
    background: var(--background-light);
    color: var(--text-dark);
    transition: all 0.3s ease-in-out;
}

/* Dark Mode */
body.dark-mode {
    background: var(--background-dark);
    color: var(--text-light);
}

body.dark-mode .navbar,
body.dark-mode .sidebar {
    background: #222;
}

body.dark-mode a {
    color: var(--text-light);
}

/* Theme Color Updates */
.theme-green {
    --primary-color: #006400;
}
.theme-blue {
    --primary-color: #007BFF;
}
.theme-red {
    --primary-color: #FF4136;
}
.theme-purple {
    --primary-color: #6f42c1;
}

/* Navbar */
.navbar {
    background: var(--primary-color);
    color: var(--secondary-color);
}

/* Sidebar */
.sidebar {
    background: var(--primary-color);
}

/* Card Container */
.card {
    background: rgba(255, 255, 255, 0.9);
    box-shadow: var(--shadow);
    color: var(--text-dark);
}
body.dark-mode .card {
    background: #1e1e1e;
    color: var(--text-light);
}

/* Text Size */
body.text-small {
    font-size: 14px;
}
body.text-medium {
    font-size: 16px;
}
body.text-large {
    font-size: 18px;
}

/* Toggle Switch (Dark Mode) */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 40px;
    height: 20px;
}
.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}
.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: 0.4s;
    border-radius: 20px;
}
.slider:before {
    position: absolute;
    content: "";
    height: 14px;
    width: 14px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: 0.4s;
    border-radius: 50%;
}
input:checked + .slider {
    background-color: var(--primary-color);
}
input:checked + .slider:before {
    transform: translateX(20px);
}