:root {
    --background-color: #f8f9fa; /* Light mode background */
    --text-color: #212529; /* Light mode text */
    --card-bg-dark: #343a40; /* Dark mode default card bg */
    --card-text-dark: #f8f9fa; /* Dark mode default card text */
    --card-footer-text-dark: #aaa; /* Dark mode card footer text */

    --price-up-color: #dc3545; /* Red for positive change */
    --price-down-color: #0d6efd; /* Blue for negative change */
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

body.dark-mode {
    --background-color: #222;
    --text-color: #f8f9fa;
    --card-bg-dark: #343a40;
    --card-text-dark: #f8f9fa;
    --card-footer-text-dark: #aaa;

    --price-up-color: #dc3545; /* Red for positive change */
    --price-down-color: #0d6efd; /* Blue for negative change */
}

.card {
    transition: all 0.3s ease-in-out;
    background-color: var(--card-bg, #fff); /* Default for light mode */
    color: var(--card-text, var(--text-color));
}

body.dark-mode .card {
    background-color: var(--card-bg-dark);
    color: var(--card-text-dark);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
}

body.dark-mode .card:hover {
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.2);
}

/* Gold Card Styling */
#gold-card {
    --card-bg: #FFD700; /* Gold color */
    --card-text: #212529; /* Black text for readability */
    --card-footer-text: #555;
    background-color: var(--card-bg);
    color: var(--card-text);
}

body.dark-mode #gold-card {
    --card-bg: #B8860B; /* Darker gold for dark mode */
    --card-text: #f8f9fa;
    background-color: var(--card-bg);
    color: var(--card-text);
}


/* Silver Card Styling */
#silver-card {
    --card-bg: #C0C0C0; /* Silver color */
    --card-text: #212529; /* Black text for readability */
    --card-footer-text: #555;
    background-color: var(--card-bg);
    color: var(--card-text);
}

body.dark-mode #silver-card {
    --card-bg: #778899; /* Darker silver for dark mode */
    --card-text: #f8f9fa;
    background-color: var(--card-bg);
    color: var(--card-text);
}

.card-header.fs-4 {
    font-weight: bold;
}

.card-title {
    font-size: 3rem;
    font-weight: bold;
}

.card-text.prev-close {
    font-size: 0.9rem;
    color: var(--prev-close-text-color, #6c757d); /* Default for light mode */
    margin-top: 5px;
}

body.dark-mode .card-text.prev-close {
    color: var(--prev-close-text-color-dark, #ccc);
}

.price-change {
    font-size: 1.5rem;
    font-weight: bold;
    vertical-align: middle;
    margin-left: 10px;
}

.price-change.up {
    color: var(--price-up-color);
}

.price-change.down {
    color: var(--price-down-color);
}


.btn-primary {
    background-color: #0d6efd;
    border-color: #0d6efd;
    transition: background-color 0.2s;
}

.btn-primary:hover {
    background-color: #0b5ed7;
    border-color: #0a58ca;
}

.card-footer {
    color: var(--card-footer-text, #6c757d) !important;
}

body.dark-mode .card-footer {
    color: var(--card-footer-text-dark) !important;
}

/* Theme switcher button */
#theme-switcher {
    border: none;
    background-color: transparent;
    color: var(--text-color);
    font-size: 1.5rem;
    cursor: pointer;
    transition: color 0.3s;
}

body.dark-mode #theme-switcher {
    color: var(--text-color);
}