:root {
        --primary-color: #e44d26; /* Một màu cam đỏ mạnh mẽ */
        --secondary-color: #f7931e; /* Màu cam sáng */
        --accent-color: #4CAF50; /* Màu xanh lá cây cho điểm nhấn */
        --text-dark: #333;
        --text-light: #f5f5f5;
        --bg-dark: #1a1a1a;
        --bg-light: #ffffff;
        --border-color: #ddd;
        --spacing-unit: 16px;
    }

    /* Base styles for the page */
    .page-win-18 {
        font-family: 'Arial', sans-serif;
        color: var(--text-dark);
        line-height: 1.6;
        background-color: var(--bg-light);
        display: flex;
        flex-direction: column;
        align-items: center;
        width: 100%;
        max-width: 100%;
        overflow-x: hidden;
        box-sizing: border-box;
    }

    .page-win-18__container {
        width: 100%;
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 var(--spacing-unit);
        box-sizing: border-box;
    }

    .page-win-18__section {
        padding: calc(2 * var(--spacing-unit)) 0;
        width: 100%;
        box-sizing: border-box;
    }

    .page-win-18__section--dark {
        background-color: var(--bg-dark);
        color: var(--text-light);
    }

    .page-win-18__section-title {
        font-size: 2.5em;
        color: var(--primary-color);
        text-align: center;
        margin-bottom: calc(2 * var(--spacing-unit));
        font-weight: bold;
    }
    .page-win-18__section-title--light {
        color: var(--text-light);
    }

    .page-win-18__text-center {
        text-align: center;
    }

    /* Hero Section */
    .page-win-18__hero-section {
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        color: var(--text-light);
        text-align: center;
        padding: calc(4 * var(--spacing-unit)) var(--spacing-unit) calc(2 * var(--spacing-unit));
        padding-top: calc(2 * var(--spacing-unit)); /* Adjust to avoid double padding if body has it */
        box-sizing: border-box;
        width: 100%;
        position: relative;
        overflow: hidden;
    }

    .page-win-18__hero-content {
        max-width: 800px;
        margin: 0 auto;
        position: relative;
        z-index: 1;
    }

    .page-win-18__hero-title {
        font-size: 3em;
        margin-bottom: var(--spacing-unit);
        font-weight: bold;
        line-height: 1.2;
        color: var(--text-light);
    }

    .page-win-18__hero-subtitle {
        font-size: 1.5em;
        margin-bottom: calc(2 * var(--spacing-unit));
        color: var(--text-light);
    }

    .page-win-18__hero-image {
        width: 100%;
        max-width: 100%;
        height: auto;
        display: block;
        margin: calc(2 * var(--spacing-unit)) auto 0;
        border-radius: 10px;
        box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
        box-sizing: border-box;
    }

    /* Sticky Buttons */
    .page-win-18__sticky-buttons {
        position: fixed;
        bottom: calc(2 * var(--spacing-unit));
        right: var(--spacing-unit);
        left: var(--spacing-unit);
        display: flex;
        justify-content: space-around;
        gap: var(--spacing-unit);
        z-index: 1000;
        max-width: 400px; /* Limit width on larger screens */
        margin: 0 auto;
    }

    .page-win-18__sticky-button {
        flex: 1;
        padding: var(--spacing-unit) calc(1.5 * var(--spacing-unit));
        border: none;
        border-radius: 50px;
        font-size: 1.1em;
        font-weight: bold;
        cursor: pointer;
        transition: background-color 0.3s ease, transform 0.2s ease;
        text-align: center;
        text-decoration: none; /* Ensure button looks like button */
        color: var(--text-light);
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
        box-sizing: border-box;
        white-space: nowrap; /* Prevent text wrapping */
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .page-win-18__sticky-button--register {
        background-color: var(--accent-color);
    }

    .page-win-18__sticky-button--register:hover {
        background-color: #45a049;
        transform: translateY(-2px);
    }

    .page-win-18__sticky-button--login {
        background-color: var(--primary-color);
    }

    .page-win-18__sticky-button--login:hover {
        background-color: #d44422;
        transform: translateY(-2px);
    }

    /* Game Showcase Section */
    .page-win-18__game-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: calc(1.5 * var(--spacing-unit));
        margin-top: calc(2 * var(--spacing-unit));
    }

    .page-win-18__game-card {
        background-color: var(--bg-light);
        border-radius: 10px;
        overflow: hidden;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        transition: transform 0.3s ease, box-shadow 0.3s ease;
        text-align: center;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
    }

    .page-win-18__game-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
    }

    .page-win-18__game-image {
        width: 100%;
        height: 200px; /* Fixed height for consistency */
        object-fit: cover;
        display: block;
        max-width: 100%;
        box-sizing: border-box;
    }

    .page-win-18__game-info {
        padding: var(--spacing-unit);
    }

    .page-win-18__game-title {
        font-size: 1.3em;
        margin-bottom: var(--spacing-unit);
        color: var(--primary-color);
        font-weight: bold;
    }

    .page-win-18__game-description {
        font-size: 0.95em;
        color: var(--text-dark);
        margin-bottom: var(--spacing-unit);
    }

    /* Promotions Section */
    .page-win-18__promotion-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: calc(1.5 * var(--spacing-unit));
        margin-top: calc(2 * var(--spacing-unit));
    }

    .page-win-18__promotion-card {
        background-color: var(--bg-dark);
        color: var(--text-light);
        border-radius: 10px;
        overflow: hidden;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
        display: flex;
        flex-direction: column;
        transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .page-win-18__promotion-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
    }

    .page-win-18__promotion-image {
        width: 100%;
        height: 220px;
        object-fit: cover;
        display: block;
        max-width: 100%;
        box-sizing: border-box;
    }

    .page-win-18__promotion-content {
        padding: calc(1.5 * var(--spacing-unit));
        flex-grow: 1;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
    }

    .page-win-18__promotion-title {
        font-size: 1.4em;
        margin-bottom: var(--spacing-unit);
        color: var(--secondary-color);
        font-weight: bold;
    }

    .page-win-18__promotion-description {
        font-size: 0.95em;
        margin-bottom: calc(1.5 * var(--spacing-unit));
    }

    .page-win-18__promotion-button {
        display: inline-block;
        padding: 10px 20px;
        background-color: var(--accent-color);
        color: var(--text-light);
        border-radius: 50px;
        text-decoration: none;
        font-weight: bold;
        transition: background-color 0.3s ease;
        text-align: center;
        border: none; /* Ensure it's a button style */
        cursor: pointer;
        align-self: flex-start; /* Align button to start */
    }

    .page-win-18__promotion-button:hover {
        background-color: #45a049;
    }

    /* Features Section */
    .page-win-18__features-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: calc(1.5 * var(--spacing-unit));
        margin-top: calc(2 * var(--spacing-unit));
    }

    .page-win-18__feature-card {
        background-color: var(--bg-light);
        border: 1px solid var(--border-color);
        border-radius: 10px;
        padding: calc(1.5 * var(--spacing-unit));
        text-align: center;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
        transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .page-win-18__feature-card:hover {
        transform: translateY(-3px);
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    }

    .page-win-18__feature-icon {
        width: 80px;
        height: 80px;
        margin-bottom: var(--spacing-unit);
        display: block; /* Center image */
        margin-left: auto;
        margin-right: auto;
        max-width: 100%;
        box-sizing: border-box;
    }

    .page-win-18__feature-title {
        font-size: 1.2em;
        color: var(--primary-color);
        margin-bottom: var(--spacing-unit);
        font-weight: bold;
    }

    .page-win-18__feature-description {
        font-size: 0.95em;
        color: var(--text-dark);
    }

    /* FAQ Section */
    .page-win-18__faq-section {
        background-color: #f9f9f9;
    }

    .page-win-18__faq-list {
        list-style: none;
        padding: 0;
        margin: 0 auto;
        max-width: 800px;
    }

    .page-win-18__faq-item {
        background-color: var(--bg-light);
        border: 1px solid var(--border-color);
        border-radius: 8px;
        margin-bottom: var(--spacing-unit);
        overflow: hidden;
        box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    }

    .page-win-18__faq-question {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: var(--spacing-unit) calc(1.5 * var(--spacing-unit));
        cursor: pointer;
        background-color: var(--primary-color);
        color: var(--text-light);
        font-weight: bold;
        border-bottom: 1px solid rgba(255, 255, 255, 0.2);
        user-select: none;
        transition: background-color 0.3s ease;
    }

    .page-win-18__faq-question:hover {
        background-color: #d44422;
    }

    .page-win-18__faq-question h3 {
        margin: 0;
        font-size: 1.1em;
        flex-grow: 1;
        text-align: left;
        color: var(--text-light); /* Ensure contrast */
        pointer-events: none; /* Prevent h3 from blocking click */
    }

    .page-win-18__faq-toggle {
        font-size: 1.5em;
        font-weight: bold;
        width: 30px;
        height: 30px;
        display: flex;
        justify-content: center;
        align-items: center;
        pointer-events: none; /* Prevent toggle from blocking click */
    }

    .page-win-18__faq-answer {
        max-height: 0;
        overflow: hidden;
        padding: 0 calc(1.5 * var(--spacing-unit));
        opacity: 0;
        transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
        background-color: var(--bg-light);
        color: var(--text-dark);
    }
    
    .page-win-18__faq-item.active .page-win-18__faq-answer {
        max-height: 2000px !important; /* Sufficiently large */
        padding: calc(1.5 * var(--spacing-unit)) !important;
        opacity: 1;
    }

    .page-win-18__faq-item.active .page-win-18__faq-question {
        background-color: var(--secondary-color);
    }

    /* Call to Action */
    .page-win-18__cta-section {
        background: linear-gradient(90deg, var(--secondary-color), var(--primary-color));
        color: var(--text-light);
        text-align: center;
    }

    .page-win-18__cta-title {
        font-size: 2.2em;
        margin-bottom: var(--spacing-unit);
        font-weight: bold;
        color: var(--text-light);
    }

    .page-win-18__cta-description {
        font-size: 1.2em;
        margin-bottom: calc(2 * var(--spacing-unit));
    }

    .page-win-18__cta-button {
        display: inline-block;
        padding: 15px 30px;
        background-color: var(--accent-color);
        color: var(--text-light);
        border-radius: 50px;
        text-decoration: none;
        font-weight: bold;
        font-size: 1.1em;
        transition: background-color 0.3s ease, transform 0.2s ease;
        border: none; /* Ensure button style */
        cursor: pointer;
    }

    .page-win-18__cta-button:hover {
        background-color: #45a049;
        transform: translateY(-2px);
    }

    /* Mobile Responsiveness */
    @media (max-width: 768px) {
        .page-win-18__hero-title {
            font-size: 2.2em;
        }

        .page-win-18__hero-subtitle {
            font-size: 1.2em;
        }

        .page-win-18__section-title {
            font-size: 2em;
        }

        .page-win-18__game-grid,
        .page-win-18__promotion-grid,
        .page-win-18__features-grid {
            grid-template-columns: 1fr;
        }

        /* List item responsive requirements */
        .page-win-18__game-card,
        .page-win-18__promotion-card,
        .page-win-18__feature-card,
        .page-win-18__faq-item {
            width: 100% !important;
            max-width: 100% !important;
            box-sizing: border-box !important;
            margin-left: 0 !important;
            margin-right: 0 !important;
        }

        .page-win-18__game-grid,
        .page-win-18__promotion-grid,
        .page-win-18__features-grid,
        .page-win-18__faq-list {
            width: 100% !important;
            max-width: 100% !important;
            box-sizing: border-box !important;
            padding: 0 !important;
            margin-left: 0 !important;
            margin-right: 0 !important;
        }

        .page-win-18__faq-answer {
            padding: 15px !important; /* Adjust padding for mobile */
            word-wrap: break-word !important;
            overflow-wrap: break-word !important;
            word-break: break-word !important;
        }
        .page-win-18__faq-question h3 {
            font-size: 1em;
        }
        .page-win-18__sticky-buttons {
            flex-direction: column;
            bottom: var(--spacing-unit);
            left: 50%;
            transform: translateX(-50%);
            width: calc(100% - 2 * var(--spacing-unit));
            max-width: 300px;
        }
        .page-win-18__sticky-button {
            width: 100%;
        }

        .page-win-18__hero-section {
            padding-bottom: calc(4 * var(--spacing-unit)); /* Add space for sticky buttons */
        }
        .page-win-18__cta-title {
            font-size: 1.8em;
        }
        .page-win-18__cta-description {
            font-size: 1em;
        }
        .page-win-18__cta-button {
            padding: 12px 25px;
            font-size: 1em;
        }

        .page-win-18__game-image,
        .page-win-18__promotion-image,
        .page-win-18__feature-icon {
            max-width: 100% !important;
            height: auto !important; /* Ensure images scale */
            box-sizing: border-box !important;
        }
    }

    @media (max-width: 480px) {
        .page-win-18__hero-title {
            font-size: 1.8em;
        }
        .page-win-18__hero-subtitle {
            font-size: 1em;
        }
        .page-win-18__section-title {
            font-size: 1.8em;
        }
        .page-win-18__sticky-buttons {
            max-width: 250px;
        }
    }