:root {
        --primary-color: #e44d26; /* Cam đỏ */
        --secondary-color: #f7b731; /* Vàng cam */
        --background-dark: #1a1a2e; /* Xanh đen */
        --background-light: #2e3a59; /* Xanh đậm */
        --text-color-light: #f0f0f0;
        --text-color-dark: #333;
        --accent-color: #00bcd4; /* Xanh ngọc */
        --border-color: #3f4a6b;
        --max-width-content: 1200px;
    }

    /* Base styles for the page-ga13 context */
    .page-ga13 {
        font-family: 'Arial', sans-serif;
        color: var(--text-color-light);
        background-color: var(--background-dark);
        line-height: 1.6;
        overflow-x: hidden;
    }

    .page-ga13__container {
        max-width: var(--max-width-content);
        margin: 0 auto;
        padding: 20px;
        box-sizing: border-box;
    }

    .page-ga13__section {
        padding: 40px 20px;
        margin-bottom: 20px;
        background-color: var(--background-light);
        border-radius: 8px;
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    }

    .page-ga13__section--dark {
        background-color: var(--background-dark);
    }

    .page-ga13__heading {
        text-align: center;
        color: var(--secondary-color);
        margin-bottom: 30px;
        font-size: 2.5em;
        font-weight: bold;
        text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    }

    .page-ga13__subheading {
        text-align: center;
        color: var(--text-color-light);
        margin-bottom: 20px;
        font-size: 1.5em;
    }

    /* Hero Section */
    .page-ga13__hero-section {
        position: relative;
        text-align: center;
        padding: 10px 0 60px; /* Small padding-top as body handles header offset */
        background: linear-gradient(135deg, var(--background-dark) 0%, #0f172a 100%);
        overflow: hidden;
    }

    .page-ga13__hero-image-wrapper {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        overflow: hidden;
        z-index: 0;
    }

    .page-ga13__hero-image {
        width: 100%;
        height: 100%;
        object-fit: cover;
        opacity: 0.3; /* Slightly transparent to let text stand out */
        filter: brightness(0.7); /* Darken image slightly */
    }

    .page-ga13__hero-content {
        position: relative;
        z-index: 1;
        max-width: 900px;
        margin: 0 auto;
        padding: 40px 20px;
    }

    .page-ga13__hero-title {
        font-size: 3.5em;
        color: var(--primary-color);
        margin-bottom: 20px;
        text-shadow: 3px 3px 6px rgba(0, 0, 0, 0.7);
        line-height: 1.2;
    }

    .page-ga13__hero-description {
        font-size: 1.3em;
        color: var(--text-color-light);
        margin-bottom: 40px;
        max-width: 700px;
        margin-left: auto;
        margin-right: auto;
    }

    .page-ga13__cta-button {
        display: inline-block;
        background-color: var(--secondary-color);
        color: var(--background-dark);
        padding: 15px 30px;
        border-radius: 50px;
        font-size: 1.2em;
        font-weight: bold;
        text-decoration: none;
        transition: background-color 0.3s ease, transform 0.3s ease;
        border: none;
        cursor: pointer;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
    }

    .page-ga13__cta-button:hover {
        background-color: #ffc107;
        transform: translateY(-3px);
    }

    /* Floating Buttons */
    .page-ga13__floating-buttons {
        position: fixed;
        bottom: 20px;
        right: 20px;
        z-index: 1000;
        display: flex;
        flex-direction: column;
        gap: 10px;
    }

    .page-ga13__floating-button {
        background-color: var(--primary-color);
        color: var(--text-color-light);
        padding: 12px 25px;
        border-radius: 30px;
        font-size: 1.1em;
        font-weight: bold;
        text-align: center;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
        transition: background-color 0.3s ease, transform 0.3s ease;
        border: none;
        cursor: pointer;
    }

    .page-ga13__floating-button--login {
        background-color: var(--accent-color);
    }

    .page-ga13__floating-button:hover {
        transform: translateY(-3px);
        filter: brightness(1.1);
    }

    /* Game Categories Section */
    .page-ga13__game-categories {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 25px;
        margin-top: 40px;
    }

    .page-ga13__game-card {
        background-color: var(--background-dark);
        border-radius: 10px;
        overflow: hidden;
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.5);
        transition: transform 0.3s ease, box-shadow 0.3s ease;
        text-align: center;
        border: 1px solid var(--border-color);
    }

    .page-ga13__game-card:hover {
        transform: translateY(-8px);
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.7);
    }

    .page-ga13__game-card-image {
        width: 100%;
        height: 250px;
        object-fit: cover;
        border-bottom: 1px solid var(--border-color);
    }

    .page-ga13__game-card-title {
        font-size: 1.4em;
        color: var(--secondary-color);
        padding: 15px 10px;
        margin: 0;
        font-weight: bold;
    }

    .page-ga13__game-card-description {
        padding: 0 15px 20px;
        font-size: 0.95em;
        color: var(--text-color-light);
    }

    /* Promotions Section */
    .page-ga13__promotions-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 25px;
        margin-top: 40px;
    }

    .page-ga13__promotion-card {
        background-color: var(--background-dark);
        border-radius: 10px;
        overflow: hidden;
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.5);
        transition: transform 0.3s ease, box-shadow 0.3s ease;
        border: 1px solid var(--border-color);
        display: flex;
        flex-direction: column;
    }

    .page-ga13__promotion-card:hover {
        transform: translateY(-8px);
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.7);
    }

    .page-ga13__promotion-image {
        width: 100%;
        height: 220px;
        object-fit: cover;
        border-bottom: 1px solid var(--border-color);
    }

    .page-ga13__promotion-content {
        padding: 20px;
        flex-grow: 1;
    }

    .page-ga13__promotion-title {
        font-size: 1.5em;
        color: var(--primary-color);
        margin-bottom: 10px;
        font-weight: bold;
    }

    .page-ga13__promotion-description {
        font-size: 1em;
        color: var(--text-color-light);
        margin-bottom: 15px;
    }

    /* Providers & Payments Section */
    .page-ga13__logo-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 20px;
        margin-top: 30px;
        align-items: center;
        justify-items: center;
    }

    .page-ga13__logo-item {
        background-color: var(--background-light);
        padding: 15px;
        border-radius: 8px;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
        text-align: center;
        transition: transform 0.3s ease;
        border: 1px solid var(--border-color);
    }

    .page-ga13__logo-item:hover {
        transform: scale(1.05);
    }

    .page-ga13__logo-image {
        max-width: 100%;
        height: auto;
        max-height: 80px;
        object-fit: contain;
        filter: grayscale(0.7) brightness(1.2); /* Soften logos for dark background */
        transition: filter 0.3s ease;
    }

    .page-ga13__logo-item:hover .page-ga13__logo-image {
        filter: grayscale(0) brightness(1); /* Full color on hover */
    }

    .page-ga13__logo-text {
        font-size: 0.9em;
        color: var(--text-color-light);
        margin-top: 10px;
    }

    /* FAQ Section */
    .page-ga13__faq-container {
        margin-top: 40px;
    }

    .page-ga13__faq-item {
        background-color: var(--background-dark);
        border: 1px solid var(--border-color);
        border-radius: 8px;
        margin-bottom: 15px;
        overflow: hidden;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    }

    .page-ga13__faq-question {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 18px 25px;
        cursor: pointer;
        background-color: var(--background-light);
        color: var(--secondary-color);
        font-size: 1.15em;
        font-weight: bold;
        transition: background-color 0.3s ease;
        user-select: none;
    }

    .page-ga13__faq-question:hover {
        background-color: #3f4a6b;
    }

    .page-ga13__faq-question h3 {
        margin: 0;
        font-size: 1em; /* Adjust to fit parent font size */
        color: var(--secondary-color);
        pointer-events: none; /* Prevent h3 from blocking click event */
    }

    .page-ga13__faq-toggle {
        font-size: 1.8em;
        line-height: 1;
        transition: transform 0.3s ease;
        color: var(--primary-color);
        pointer-events: none; /* Prevent toggle icon from blocking click event */
    }

    .page-ga13__faq-item.active .page-ga13__faq-toggle {
        transform: rotate(45deg); /* Plus to X (minus) */
        color: var(--accent-color);
    }

    .page-ga13__faq-answer {
        max-height: 0;
        overflow: hidden;
        padding: 0 25px;
        opacity: 0;
        background-color: var(--background-dark);
        color: var(--text-color-light);
        transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
    }

    .page-ga13__faq-item.active .page-ga13__faq-answer {
        max-height: 2000px !important; /* Sufficiently large */
        padding: 20px 25px !important;
        opacity: 1;
    }

    .page-ga13__faq-answer p {
        margin: 0;
        padding-bottom: 10px;
    }

    /* Responsive Design */
    @media (max-width: 768px) {
        .page-ga13__heading {
            font-size: 2em;
        }

        .page-ga13__hero-title {
            font-size: 2.5em;
        }

        .page-ga13__hero-description {
            font-size: 1.1em;
        }

        .page-ga13__cta-button {
            padding: 12px 25px;
            font-size: 1.1em;
        }

        .page-ga13__floating-buttons {
            flex-direction: row;
            width: calc(100% - 40px);
            left: 20px;
            right: 20px;
            bottom: 15px;
            justify-content: space-around;
        }

        .page-ga13__floating-button {
            flex: 1;
            padding: 10px 15px;
            font-size: 1em;
        }

        .page-ga13__game-categories,
        .page-ga13__promotions-grid,
        .page-ga13__logo-grid {
            grid-template-columns: 1fr;
            gap: 15px;
        }

        .page-ga13__game-card-image,
        .page-ga13__promotion-image {
            height: 200px;
        }

        .page-ga13__faq-question {
            padding: 15px 20px;
            font-size: 1.05em;
        }

        .page-ga13__faq-answer {
            padding: 0 20px;
        }

        .page-ga13__faq-item.active .page-ga13__faq-answer {
            padding: 15px 20px !important;
        }

        /* List item responsive adjustments */
        .page-ga13__logo-grid {
            padding: 0;
            margin: 30px auto;
            width: 100%;
            max-width: 100%;
            box-sizing: border-box;
        }
        .page-ga13__logo-item {
            width: 100% !important;
            max-width: 100% !important;
            box-sizing: border-box !important;
            margin-left: 0 !important;
            margin-right: 0 !important;
            padding: 10px !important; /* Adjust padding for smaller screens */
            word-wrap: break-word !important;
            overflow-wrap: break-word !important;
        }
        .page-ga13__logo-text {
            word-break: break-word !important;
        }

        /* Image responsive adjustments */
        .page-ga13__hero-image,
        .page-ga13__game-card-image,
        .page-ga13__promotion-image,
        .page-ga13__logo-image {
            max-width: 100% !important;
            height: auto !important;
            box-sizing: border-box !important;
        }
        .page-ga13__hero-image-wrapper,
        .page-ga13__game-card,
        .page-ga13__promotion-card,
        .page-ga13__logo-item {
            width: 100% !important;
            max-width: 100% !important;
            overflow: hidden !important;
            box-sizing: border-box !important;
        }
    }

    @media (max-width: 480px) {
        .page-ga13__hero-title {
            font-size: 2em;
        }
        .page-ga13__hero-description {
            font-size: 1em;
        }
        .page-ga13__floating-buttons {
            flex-direction: column;
            bottom: 10px;
            right: 10px;
            left: auto;
            width: auto;
            gap: 8px;
        }
        .page-ga13__floating-button {
            padding: 8px 18px;
            font-size: 0.9em;
        }
    }