/* Theme Colors */
:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --background-color: #f5f6fa;
    --text-color: #333;
}

/* Dark Theme */
body.dark-theme {
    --background-color: #121212;
    --text-color: #e0e0e0;
    --primary-color: #bb86fc;
    --secondary-color: #03dac6;
    background-color: var(--background-color);
    color: var(--text-color);
}

body.dark-theme .navbar {
    background-color: var(--primary-color);
}

body.dark-theme #progress-bar {
    background-color: var(--secondary-color);
}

html {
    scroll-behavior: smooth;
}

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

/* Scroll Progress Bar */
#progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    height: 5px;
    background-color: var(--primary-color);
    width: 0%;
    z-index: 999;
}

/* Back-to-Top Button */
#back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    padding: 10px 15px;
    font-size: 18px;
    border: none;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: #fff;
    cursor: pointer;
    z-index: 1000;
    box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.2);
    transition: background-color 0.3s;
}

#back-to-top:hover {
    background-color: var(--secondary-color);
}

/* Card Hover Effects */
.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 15px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card-body h5::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 50%;
    background-color: var(--primary-color);
    transition: width 0.3s, left 0.3s;
}

.card-body h5:hover::after {
    width: 100%;
    left: 0;
}