:root {
    --card-red: #8B0000;
    --card-gold: #FFD700;
    --card-gold-dark: #8B6914;
    --card-orange: #FFA500;
    --card-width: 413px;
    --card-height: 576px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--card-red);
    overflow-x: hidden;
}

.card-container {
    width: var(--card-width);
    height: var(--card-height);
    background-size: cover;
    background-position: center;
    position: relative;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

/* Responsive for mobile */
@media (max-width: 480px) {
    .card-container {
        width: 100vw;
        height: calc(100vw * 1.39); /* Maintain aspect ratio */
    }
}

.back-button {
    position: absolute;
    top: 20px;
    left: 20px;
    padding: 8px 15px;
    background-color: #666;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    z-index: 10;
    transition: background-color 0.3s ease;
}

.back-button:hover {
    background-color: #444;
}

/* Loading spinner */
.spinner {
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top: 4px solid var(--card-gold);
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Fade in animation */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}