:root {
    /* Dark Mode (Default) */
    --bg-color: #121212;
    --text-color: #ffffff;
    --card-bg-color: rgba(30, 30, 30, 0.7); /* #1e1e1e with transparency */
    --card-border-color: #333;
    --primary-color: #007bff;
    --primary-hover-color: #0056b3;
    --overlay-color: rgba(0, 0, 0, 0.5);
}

@media (prefers-color-scheme: light) {
    :root {
        /* Light Mode */
        --bg-color: #f8f9fa;
        --text-color: #212529;
        --card-bg-color: rgba(255, 255, 255, 0.7); /* #ffffff with transparency */
        --card-border-color: #dee2e6;
        --primary-color: #007bff;
        --primary-hover-color: #0056b3;
        --overlay-color: rgba(255, 255, 255, 0.5);
    }
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    position: relative;
    min-height: 100vh;
}

.bg-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--overlay-color);
    z-index: 1;
}

.container {
    padding-top: 50px;
    position: relative;
    z-index: 2;
}

.card {
    background-color: var(--card-bg-color);
    border: 1px solid var(--card-border-color);
    transition: transform 0.2s;
}

.card:hover {
    transform: translateY(-5px);
}

.card-title {
    color: var(--text-color);
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: var(--primary-hover-color);
    border-color: var(--primary-hover-color);
}

i {
    color: var(--primary-color);
}

h1 {
    color: var(--text-color);
}

/* --- Responsive Adjustments for Mobile --- */
@media (max-width: 767px) {
    h1 {
        font-size: 2rem; /* Reduce font size for the main title */
    }

    .container {
        padding-top: 30px; /* Reduce top padding */
    }
}