:root {
        --primary-color: #ff4757; /* Đỏ */
        --secondary-color: #2ed573; /* Xanh lá */
        --dark-bg: #1a1a2e; /* Nền tối */
        --light-text: #ffffff;
        --gray-text: #cccccc;
        --accent-color: #f7b731; /* Vàng */
        --border-color: #33334f;
    }

    body {
        font-family: 'Arial', sans-serif;
        line-height: 1.6;
        color: var(--light-text);
        background-color: var(--dark-bg);
        margin: 0;
        padding: 0;
        overflow-x: hidden;
    }

    .page-ff66 {
        max-width: 1200px;
        margin: 0 auto;
        padding: 10px; /* Small top padding, assuming body handles main header offset */
        box-sizing: border-box;
    }

    .page-ff66__section {
        background-color: #2a2a4a;
        margin-bottom: 25px;
        padding: 25px 20px;
        border-radius: 12px;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
        border: 1px solid var(--border-color);
    }

    .page-ff66__section-title {
        text-align: center;
        color: var(--primary-color);
        font-size: 2.5em;
        margin-bottom: 25px;
        font-weight: bold;
        position: relative;
        padding-bottom: 10px;
    }

    .page-ff66__section-title::after {
        content: '';
        position: absolute;
        left: 50%;
        bottom: 0;
        transform: translateX(-50%);
        width: 80px;
        height: 4px;
        background-color: var(--accent-color);
        border-radius: 2px;
    }

    .page-ff66__text-center {
        text-align: center;
    }

    .page-ff66__description {
        font-size: 1.1em;
        color: var(--gray-text);
        margin-bottom: 20px;
        text-align: center;
    }

    /* Hero Section */
    .page-ff66__hero-section {
        background: linear-gradient(135deg, #1a1a2e, #33334f);
        padding: 60px 20px 40px;
        border-radius: 12px;
        text-align: center;
        margin-bottom: 25px;
        border: 1px solid var(--border-color);
    }

    .page-ff66__hero-title {
        font-size: 3.5em;
        color: var(--accent-color);
        margin-bottom: 15px;
        text-shadow: 0 3px 6px rgba(0, 0, 0, 0.4);
        font-weight: 900;
        letter-spacing: 1px;
    }

    .page-ff66__hero-subtitle {
        font-size: 1.8em;
        color: var(--light-text);
        margin-bottom: 25px;
        font-weight: 600;
    }

    .page-ff66__hero-cta {
        display: inline-block;
        background-color: var(--primary-color);
        color: var(--light-text);
        padding: 15px 35px;
        border-radius: 30px;
        text-decoration: none;
        font-size: 1.2em;
        font-weight: bold;
        transition: background-color 0.3s ease, transform 0.2s ease;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    }

    .page-ff66__hero-cta:hover {
        background-color: #e63946;
        transform: translateY(-3px);
    }

    /* Game Categories */
    .page-ff66__game-categories {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 20px;
        margin-top: 30px;
    }

    .page-ff66__game-card {
        background-color: #33334f;
        border-radius: 10px;
        overflow: hidden;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
        transition: transform 0.3s ease, box-shadow 0.3s ease;
        border: 1px solid var(--border-color);
        display: flex;
        flex-direction: column;
        align-items: center;
        text-align: center;
        padding-bottom: 20px;
    }

    .page-ff66__game-card:hover {
        transform: translateY(-8px);
        box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
    }

    .page-ff66__game-card-image {
        width: 100%;
        height: 200px;
        object-fit: cover;
        display: block;
        border-bottom: 1px solid var(--border-color);
    }

    .page-ff66__game-card-title {
        font-size: 1.5em;
        color: var(--accent-color);
        margin: 15px 0 10px;
        font-weight: bold;
    }

    .page-ff66__game-card-description {
        color: var(--gray-text);
        padding: 0 15px;
        font-size: 0.95em;
        flex-grow: 1;
    }

    /* Promotions */
    .page-ff66__promotions-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 25px;
        margin-top: 30px;
    }

    .page-ff66__promo-item {
        background-color: #33334f;
        border-radius: 10px;
        padding: 20px;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
        border: 1px solid var(--border-color);
        display: flex;
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .page-ff66__promo-icon {
        width: 100%;
        max-width: 250px;
        height: auto;
        margin-bottom: 15px;
        border-radius: 8px;
        object-fit: cover;
    }

    .page-ff66__promo-title {
        font-size: 1.6em;
        color: var(--primary-color);
        margin-bottom: 10px;
        font-weight: bold;
    }

    .page-ff66__promo-description {
        color: var(--gray-text);
        font-size: 0.95em;
    }

    /* Providers & Payments */
    .page-ff66__logo-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
        gap: 20px;
        margin-top: 30px;
        justify-items: center;
        align-items: center;
    }

    .page-ff66__logo-item {
        background-color: #33334f;
        padding: 15px;
        border-radius: 8px;
        box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
        border: 1px solid var(--border-color);
        display: flex;
        justify-content: center;
        align-items: center;
        height: 80px; /* Fixed height for logos */
        width: 100%;
        max-width: 180px; /* Ensure logos don't get too wide */
        box-sizing: border-box;
    }

    .page-ff66__logo-image {
        max-width: 100%;
        max-height: 100%;
        object-fit: contain;
        display: block;
    }

    /* Why Choose ff66 */
    .page-ff66__features-list {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 20px;
        margin-top: 30px;
    }

    .page-ff66__feature-item {
        background-color: #33334f;
        padding: 20px;
        border-radius: 10px;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
        border: 1px solid var(--border-color);
        text-align: center;
        box-sizing: border-box; /* Crucial for responsiveness */
    }

    .page-ff66__feature-title {
        font-size: 1.3em;
        color: var(--secondary-color);
        margin-bottom: 10px;
        font-weight: bold;
    }

    .page-ff66__feature-description {
        color: var(--gray-text);
        font-size: 0.95em;
    }

    /* FAQ Section */
    .page-ff66__faq-section {
        margin-top: 40px;
    }

    .page-ff66__faq-item {
        background-color: #33334f;
        margin-bottom: 15px;
        border-radius: 8px;
        border: 1px solid var(--border-color);
        overflow: hidden;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    }

    .page-ff66__faq-question {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 18px 20px;
        cursor: pointer;
        background-color: #3c3c5c;
        color: var(--light-text);
        font-size: 1.2em;
        font-weight: bold;
        transition: background-color 0.3s ease;
    }

    .page-ff66__faq-question:hover {
        background-color: #4a4a6e;
    }

    .page-ff66__faq-question h3 {
        margin: 0;
        color: var(--accent-color);
        font-size: 1em; /* Adjust to fit parent font-size */
        pointer-events: none; /* Prevent h3 from blocking click event */
        flex-grow: 1;
    }

    .page-ff66__faq-toggle {
        font-size: 1.5em;
        font-weight: bold;
        color: var(--primary-color);
        margin-left: 15px;
        pointer-events: none; /* Prevent toggle icon from blocking click event */
        transition: transform 0.3s ease;
    }

    .page-ff66__faq-item.active .page-ff66__faq-toggle {
        transform: rotate(45deg);
    }

    .page-ff66__faq-answer {
        max-height: 0;
        overflow: hidden;
        padding: 0 15px;
        opacity: 0;
        color: var(--gray-text);
        transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
        box-sizing: border-box;
    }

    .page-ff66__faq-item.active .page-ff66__faq-answer {
        max-height: 2000px !important; /* Sufficiently large value */
        padding: 20px 15px !important;
        opacity: 1;
    }

    .page-ff66__faq-answer p {
        margin: 0;
        padding: 0;
    }

    /* Floating Register/Login Buttons */
    .page-ff66__floating-buttons {
        position: fixed;
        bottom: 20px;
        left: 50%;
        transform: translateX(-50%);
        display: flex;
        gap: 15px;
        z-index: 1000;
        background: rgba(0, 0, 0, 0.7);
        padding: 10px 20px;
        border-radius: 50px;
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    }

    .page-ff66__register-btn,
    .page-ff66__login-btn {
        display: inline-block;
        padding: 12px 25px;
        border-radius: 30px;
        font-weight: bold;
        text-decoration: none;
        transition: background-color 0.3s ease, transform 0.2s ease;
        white-space: nowrap;
        font-size: 16px;
        text-align: center;
    }

    .page-ff66__register-btn {
        background-color: var(--primary-color);
        color: var(--light-text);
        border: 2px solid var(--primary-color);
    }

    .page-ff66__register-btn:hover {
        background-color: #e63946;
        transform: translateY(-2px);
    }

    .page-ff66__login-btn {
        background-color: var(--secondary-color);
        color: var(--light-text);
        border: 2px solid var(--secondary-color);
    }

    .page-ff66__login-btn:hover {
        background-color: #24b961;
        transform: translateY(-2px);
    }

    /* Responsive Design */
    @media (max-width: 768px) {
        .page-ff66 {
            padding: 10px;
        }

        .page-ff66__hero-title {
            font-size: 2.5em;
        }

        .page-ff66__hero-subtitle {
            font-size: 1.4em;
        }

        .page-ff66__hero-cta {
            padding: 12px 25px;
            font-size: 1.1em;
        }

        .page-ff66__section-title {
            font-size: 2em;
        }

        .page-ff66__game-categories,
        .page-ff66__promotions-grid,
        .page-ff66__features-list {
            grid-template-columns: 1fr;
        }

        .page-ff66__game-card,
        .page-ff66__promo-item,
        .page-ff66__feature-item {
            width: 100% !important;
            max-width: 100% !important;
            box-sizing: border-box !important;
            margin-left: 0 !important;
            margin-right: 0 !important;
            word-wrap: break-word !important;
            overflow-wrap: break-word !important;
            word-break: break-word !important;
        }

        .page-ff66__logo-grid {
            grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
            padding: 0 !important;
            width: 100% !important;
            max-width: 100% !important;
            box-sizing: border-box !important;
            margin-left: 0 !important;
            margin-right: 0 !important;
        }

        .page-ff66__logo-item {
            height: 70px;
            max-width: 150px;
        }

        .page-ff66__game-card-image,
        .page-ff66__promo-icon {
            max-width: 100% !important;
            height: auto !important;
            box-sizing: border-box !important;
        }

        .page-ff66__floating-buttons {
            bottom: 15px;
            gap: 10px;
            padding: 8px 15px;
        }
        .page-ff66__register-btn,
        .page-ff66__login-btn {
            padding: 10px 20px;
            font-size: 15px;
        }

        /* FAQ specific mobile styles */
        .page-ff66__faq-question {
            font-size: 1.1em;
            padding: 15px 18px;
        }
        .page-ff66__faq-question h3 {
            font-size: 1em;
        }
        .page-ff66__faq-answer {
            padding: 0 18px;
        }
        .page-ff66__faq-item.active .page-ff66__faq-answer {
            padding: 15px 18px !important;
        }
    }

    @media (max-width: 480px) {
        .page-ff66__hero-title {
            font-size: 2em;
        }
        .page-ff66__hero-subtitle {
            font-size: 1.2em;
        }
        .page-ff66__section-title {
            font-size: 1.8em;
        }
        .page-ff66__game-card-title {
            font-size: 1.3em;
        }
        .page-ff66__promo-title {
            font-size: 1.4em;
        }
        .page-ff66__logo-grid {
            grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
            gap: 15px;
        }
        .page-ff66__logo-item {
            height: 60px;
        }
    }