:root {
        --yy777-apk-primary-color: #ffcc00; /* Gold/Yellow */
        --yy777-apk-secondary-color: #333333; /* Dark Grey */
        --yy777-apk-text-color: #ffffff; /* White */
        --yy777-apk-dark-bg: #1a1a1a; /* Very Dark Grey */
        --yy777-apk-light-bg: #2a2a2a; /* Slightly Lighter Dark Grey */
        --yy777-apk-border-color: #555555;
        --yy777-apk-button-hover: #e6b800;
        --yy777-apk-spacing-sm: 10px;
        --yy777-apk-spacing-md: 20px;
        --yy777-apk-spacing-lg: 40px;
    }

    .page-yy777-apk {
        font-family: 'Arial', sans-serif;
        background-color: var(--yy777-apk-dark-bg);
        color: var(--yy777-apk-text-color);
        line-height: 1.6;
        padding-top: 10px; /* Small padding, assuming body handles header offset */
    }

    .page-yy777-apk__section {
        padding: var(--yy777-apk-spacing-lg) var(--yy777-apk-spacing-md);
        max-width: 1200px;
        margin: 0 auto;
    }

    .page-yy777-apk__hero-section {
        background: var(--yy777-apk-light-bg);
        text-align: center;
        padding: var(--yy777-apk-spacing-lg) var(--yy777-apk-spacing-md) calc(var(--yy777-apk-spacing-lg) * 1.5);
        position: relative;
        overflow: hidden;
        border-bottom: 3px solid var(--yy777-apk-primary-color);
    }

    .page-yy777-apk__hero-background-image {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        object-fit: cover;
        opacity: 0.2;
        z-index: 0;
    }

    .page-yy777-apk__hero-content {
        position: relative;
        z-index: 1;
        max-width: 800px;
        margin: 0 auto;
    }

    .page-yy777-apk__hero-title {
        font-size: 2.8em;
        color: var(--yy777-apk-primary-color);
        margin-bottom: var(--yy777-apk-spacing-md);
        text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
        font-weight: bold;
    }

    .page-yy777-apk__hero-description {
        font-size: 1.2em;
        margin-bottom: var(--yy777-apk-spacing-lg);
        max-width: 700px;
        margin-left: auto;
        margin-right: auto;
    }

    .page-yy777-apk__download-button {
        display: inline-block;
        background-color: var(--yy777-apk-primary-color);
        color: var(--yy777-apk-dark-bg);
        padding: 15px 30px;
        border-radius: 8px;
        font-size: 1.2em;
        font-weight: bold;
        text-decoration: none;
        transition: background-color 0.3s ease, transform 0.2s ease;
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
        border: none;
        cursor: pointer;
    }

    .page-yy777-apk__download-button:hover {
        background-color: var(--yy777-apk-button-hover);
        transform: translateY(-2px);
    }

    .page-yy777-apk__section-title {
        font-size: 2.2em;
        color: var(--yy777-apk-primary-color);
        text-align: center;
        margin-bottom: var(--yy777-apk-spacing-lg);
        position: relative;
        padding-bottom: 10px;
    }

    .page-yy777-apk__section-title::after {
        content: '';
        position: absolute;
        left: 50%;
        bottom: 0;
        transform: translateX(-50%);
        width: 80px;
        height: 4px;
        background-color: var(--yy777-apk-primary-color);
        border-radius: 2px;
    }

    .page-yy777-apk__features-grid,
    .page-yy777-apk__games-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: var(--yy777-apk-spacing-md);
        margin-top: var(--yy777-apk-spacing-lg);
    }

    .page-yy777-apk__feature-item,
    .page-yy777-apk__game-card {
        background-color: var(--yy777-apk-light-bg);
        padding: var(--yy777-apk-spacing-md);
        border-radius: 10px;
        text-align: center;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
        transition: transform 0.3s ease, box-shadow 0.3s ease;
        border: 1px solid var(--yy777-apk-border-color);
        display: flex;
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        box-sizing: border-box; /* Crucial for mobile responsiveness */
    }

    .page-yy777-apk__feature-item:hover,
    .page-yy777-apk__game-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.5);
    }

    .page-yy777-apk__feature-icon,
    .page-yy777-apk__game-image {
        width: 100%;
        max-width: 250px; /* Max width for images within cards */
        height: auto;
        border-radius: 8px;
        margin-bottom: var(--yy777-apk-spacing-sm);
        object-fit: cover;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    }

    .page-yy777-apk__feature-title,
    .page-yy777-apk__game-title {
        font-size: 1.4em;
        color: var(--yy777-apk-primary-color);
        margin-bottom: var(--yy777-apk-spacing-sm);
        font-weight: bold;
    }

    .page-yy777-apk__install-guide-section {
        background-color: var(--yy777-apk-light-bg);
    }

    .page-yy777-apk__install-steps {
        list-style: none;
        padding: 0;
        margin-top: var(--yy777-apk-spacing-lg);
        display: flex;
        flex-direction: column;
        gap: var(--yy777-apk-spacing-md);
    }

    .page-yy777-apk__step-item {
        background-color: var(--yy777-apk-dark-bg);
        padding: var(--yy777-apk-spacing-md);
        border-radius: 10px;
        display: flex;
        align-items: flex-start;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
        border: 1px solid var(--yy777-apk-border-color);
        box-sizing: border-box; /* Crucial for mobile responsiveness */
    }

    .page-yy777-apk__step-number {
        font-size: 1.8em;
        font-weight: bold;
        color: var(--yy777-apk-primary-color);
        margin-right: var(--yy777-apk-spacing-md);
        flex-shrink: 0;
        width: 40px;
        height: 40px;
        display: flex;
        align-items: center;
        justify-content: center;
        border: 2px solid var(--yy777-apk-primary-color);
        border-radius: 50%;
    }

    .page-yy777-apk__step-content {
        flex-grow: 1;
    }

    .page-yy777-apk__step-title {
        font-size: 1.3em;
        color: var(--yy777-apk-primary-color);
        margin-bottom: var(--yy777-apk-spacing-sm);
        font-weight: bold;
    }

    .page-yy777-apk__security-section {
        text-align: center;
        background-color: var(--yy777-apk-dark-bg);
        padding-bottom: var(--yy777-apk-spacing-lg);
    }

    .page-yy777-apk__security-content {
        margin-top: var(--yy777-apk-spacing-md);
        font-size: 1.1em;
    }

    .page-yy777-apk__faq-section {
        background-color: var(--yy777-apk-light-bg);
    }

    .page-yy777-apk__faq-list {
        list-style: none;
        padding: 0;
        margin-top: var(--yy777-apk-spacing-lg);
        display: flex;
        flex-direction: column;
        gap: var(--yy777-apk-spacing-sm);
    }

    .page-yy777-apk__faq-item {
        background-color: var(--yy777-apk-dark-bg);
        border: 1px solid var(--yy777-apk-border-color);
        border-radius: 8px;
        overflow: hidden;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
        box-sizing: border-box; /* Crucial for mobile responsiveness */
    }

    .page-yy777-apk__faq-question {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 15px 20px;
        cursor: pointer;
        user-select: none;
        background-color: var(--yy777-apk-secondary-color);
        color: var(--yy777-apk-primary-color);
        font-weight: bold;
        font-size: 1.1em;
        transition: background-color 0.3s ease;
    }

    .page-yy777-apk__faq-question h3 {
        margin: 0;
        flex-grow: 1;
        pointer-events: none; /* Prevent h3 from blocking click event */
        color: var(--yy777-apk-primary-color);
    }

    .page-yy777-apk__faq-question:hover {
        background-color: #444444;
    }

    .page-yy777-apk__faq-toggle {
        font-size: 1.5em;
        line-height: 1;
        margin-left: 10px;
        pointer-events: none; /* Prevent toggle icon from blocking click event */
        transition: transform 0.3s ease;
    }

    .page-yy777-apk__faq-item.active .page-yy777-apk__faq-toggle {
        transform: rotate(45deg); /* Changes '+' to 'x' visually */
    }

    .page-yy777-apk__faq-answer {
        max-height: 0;
        overflow: hidden;
        padding: 0 20px;
        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(--yy777-apk-dark-bg);
        color: var(--yy777-apk-text-color);
    }

    .page-yy777-apk__faq-item.active .page-yy777-apk__faq-answer {
        max-height: 2000px !important; /* Sufficiently large */
        padding: 20px 20px !important;
        opacity: 1;
    }

    .page-yy777-apk__cta-section {
        text-align: center;
        background-color: var(--yy777-apk-dark-bg);
        padding-top: var(--yy777-apk-spacing-lg);
        padding-bottom: calc(var(--yy777-apk-spacing-lg) * 1.5);
    }

    .page-yy777-apk__cta-text {
        font-size: 1.5em;
        margin-bottom: var(--yy777-apk-spacing-md);
        color: var(--yy777-apk-text-color);
        font-weight: bold;
    }

    /* Responsive adjustments */
    @media (max-width: 1024px) {
        .page-yy777-apk__hero-title {
            font-size: 2.5em;
        }
        .page-yy777-apk__section-title {
            font-size: 2em;
        }
    }

    @media (max-width: 768px) {
        .page-yy777-apk__section {
            padding: var(--yy777-apk-spacing-md) var(--yy777-apk-spacing-sm);
        }
        .page-yy777-apk__hero-title {
            font-size: 2em;
        }
        .page-yy777-apk__hero-description {
            font-size: 1em;
        }
        .page-yy777-apk__download-button {
            padding: 12px 25px;
            font-size: 1em;
        }
        .page-yy777-apk__section-title {
            font-size: 1.8em;
            margin-bottom: var(--yy777-apk-spacing-md);
        }

        /* List items mobile responsiveness */
        .page-yy777-apk__features-grid,
        .page-yy777-apk__games-grid {
            grid-template-columns: 1fr;
            gap: var(--yy777-apk-spacing-sm);
            width: 100% !important;
            max-width: 100% !important;
            padding: 0 !important;
            margin-left: 0 !important;
            margin-right: 0 !important;
            box-sizing: border-box !important;
        }

        .page-yy777-apk__feature-item,
        .page-yy777-apk__game-card,
        .page-yy777-apk__step-item,
        .page-yy777-apk__faq-item {
            width: 100% !important;
            max-width: 100% !important;
            box-sizing: border-box !important;
            padding: var(--yy777-apk-spacing-sm) !important;
            margin-left: 0 !important;
            margin-right: 0 !important;
            word-wrap: break-word !important;
            overflow-wrap: break-word !important;
        }

        .page-yy777-apk__feature-item p,
        .page-yy777-apk__game-card p,
        .page-yy777-apk__step-item p,
        .page-yy777-apk__faq-answer p {
            word-break: break-word !important;
        }

        .page-yy777-apk__feature-icon,
        .page-yy777-apk__game-image {
            max-width: 200px;
            width: 100% !important;
            height: auto !important;
            margin-left: auto;
            margin-right: auto;
        }

        .page-yy777-apk__install-steps {
            width: 100% !important;
            max-width: 100% !important;
            padding: 0 !important;
            margin-left: 0 !important;
            margin-right: 0 !important;
            box-sizing: border-box !important;
        }

        .page-yy777-apk__step-item {
            flex-direction: column;
            align-items: center;
            text-align: center;
        }
        .page-yy777-apk__step-number {
            margin-right: 0;
            margin-bottom: var(--yy777-apk-spacing-sm);
        }
        .page-yy777-apk__faq-question {
            font-size: 1em;
            padding: 10px 15px;
        }
        .page-yy777-apk__faq-answer {
            padding: 15px 15px !important; /* Adjusted for mobile */
        }
        .page-yy777-apk__cta-text {
            font-size: 1.2em;
        }
    }

    @media (max-width: 480px) {
        .page-yy777-apk__hero-title {
            font-size: 1.8em;
        }
        .page-yy777-apk__section-title {
            font-size: 1.5em;
        }
        .page-yy777-apk__download-button {
            padding: 10px 20px;
            font-size: 0.9em;
        }
        .page-yy777-apk__faq-question {
            font-size: 0.9em;
        }
    }