/* CSS cho trang 66f */
    :root {
        --page-66f-primary-color: #e44d26; /* Màu đỏ cam rực rỡ cho các điểm nhấn */
        --page-66f-secondary-color: #333;
        --page-66f-accent-color: #ffcc00; /* Màu vàng/gold cho các điểm nhấn */
        --page-66f-background-dark: #1a1a1a;
        --page-66f-background-light: #2a2a2a; /* Nền tối nhẹ hơn để tạo độ tương phản */
        --page-66f-text-color-light: #fff;
        --page-66f-text-color-dark: #333;
        --page-66f-border-radius: 8px;
        --page-66f-spacing-sm: 10px;
        --page-66f-spacing-md: 20px;
        --page-66f-spacing-lg: 40px;
    }

    .page-66f {
        font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        color: var(--page-66f-text-color-light);
        background-color: var(--page-66f-background-dark);
        line-height: 1.6;
        padding-top: var(--page-66f-spacing-sm); /* Khoảng đệm nhỏ ở trên theo yêu cầu bù trừ header */
    }

    .page-66f__section {
        padding: var(--page-66f-spacing-lg) var(--page-66f-spacing-md);
        margin: 0 auto;
        max-width: 1200px;
        box-sizing: border-box;
    }

    .page-66f__section--dark {
        background-color: var(--page-66f-background-dark);
        color: var(--page-66f-text-color-light);
    }

    .page-66f__section--light {
        background-color: var(--page-66f-background-light);
        color: var(--page-66f-text-color-light);
    }

    .page-66f__container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 var(--page-66f-spacing-md);
        box-sizing: border-box;
    }

    .page-66f__header {
        text-align: center;
        margin-bottom: var(--page-66f-spacing-md);
    }

    .page-66f__header h2 {
        font-size: 2.5em;
        color: var(--page-66f-primary-color);
        margin-bottom: var(--page-66f-spacing-sm);
        position: relative;
        padding-bottom: var(--page-66f-spacing-sm);
    }

    .page-66f__header h2::after {
        content: '';
        position: absolute;
        left: 50%;
        bottom: 0;
        transform: translateX(-50%);
        width: 60px;
        height: 4px;
        background-color: var(--page-66f-accent-color);
        border-radius: 2px;
    }

    .page-66f__header p {
        font-size: 1.1em;
        color: #ccc;
    }

    /* Phần Hero */
    .page-66f__hero-section {
        position: relative;
        display: flex;
        align-items: center;
        justify-content: center;
        min-height: 400px;
        background-color: var(--page-66f-background-dark);
        overflow: hidden;
        text-align: center;
        padding: 0; /* Không có padding-top ở đây, body đã xử lý */
    }

    .page-66f__hero-image {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        object-fit: cover;
        z-index: 1;
        opacity: 0.6;
    }

    .page-66f__hero-content {
        position: relative;
        z-index: 2;
        color: var(--page-66f-text-color-light);
        padding: var(--page-66f-spacing-md);
        max-width: 800px;
    }

    .page-66f__hero-content h1 {
        font-size: 3.5em;
        margin-bottom: 15px;
        color: var(--page-66f-accent-color);
        text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
    }

    .page-66f__hero-content p {
        font-size: 1.3em;
        margin-bottom: 30px;
        text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.7);
    }

    .page-66f__hero-buttons {
        display: flex;
        gap: 15px;
        justify-content: center;
    }

    .page-66f__button {
        display: inline-block;
        padding: 12px 25px;
        background-color: var(--page-66f-primary-color);
        color: var(--page-66f-text-color-light);
        text-decoration: none;
        border-radius: var(--page-66f-border-radius);
        font-weight: bold;
        transition: background-color 0.3s ease, transform 0.2s ease;
        border: none;
        cursor: pointer;
        font-size: 1em;
    }

    .page-66f__button:hover {
        background-color: #f76b42;
        transform: translateY(-2px);
    }

    .page-66f__button--secondary {
        background-color: #4a4a4a;
    }

    .page-66f__button--secondary:hover {
        background-color: #6a6a6a;
    }

    /* Phần Giới Thiệu */
    .page-66f__about-content {
        display: flex;
        flex-direction: column;
        gap: var(--page-66f-spacing-md);
        align-items: center;
        text-align: center;
    }

    .page-66f__about-content p {
        max-width: 800px;
        font-size: 1.1em;
        color: #ccc;
    }

    /* Trưng Bày Sản Phẩm */
    .page-66f__product-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: var(--page-66f-spacing-md);
        justify-items: center;
    }

    .page-66f__product-card {
        background-color: #2a2a2a;
        border-radius: var(--page-66f-border-radius);
        overflow: hidden;
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
        transition: transform 0.3s ease, box-shadow 0.3s ease;
        text-align: center;
        max-width: 350px;
        width: 100%;
        box-sizing: border-box;
    }

    .page-66f__product-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 8px 20px rgba(0, 0, 0, 0.6);
    }

    .page-66f__product-card-image {
        width: 100%;
        height: 200px;
        object-fit: cover;
        display: block;
    }

    .page-66f__product-card-info {
        padding: 15px;
    }

    .page-66f__product-card-info h3 {
        font-size: 1.5em;
        color: var(--page-66f-primary-color);
        margin-bottom: 10px;
    }

    .page-66f__product-card-info p {
        font-size: 0.95em;
        color: #bbb;
        margin-bottom: 15px;
    }

    /* Khuyến Mãi */
    .page-66f__promotion-card {
        background-color: #2a2a2a;
        border-radius: var(--page-66f-border-radius);
        overflow: hidden;
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
        margin-bottom: var(--page-66f-spacing-md);
        display: flex;
        flex-direction: column;
        align-items: center;
        text-align: center;
        max-width: 800px;
        margin-left: auto;
        margin-right: auto;
        width: 100%;
        box-sizing: border-box;
    }

    .page-66f__promotion-image {
        width: 100%;
        height: 250px;
        object-fit: cover;
        display: block;
    }

    .page-66f__promotion-content {
        padding: var(--page-66f-spacing-md);
    }

    .page-66f__promotion-content h3 {
        font-size: 2em;
        color: var(--page-66f-accent-color);
        margin-bottom: 10px;
    }

    .page-66f__promotion-content p {
        color: #ccc;
        margin-bottom: 20px;
    }

    /* Tại Sao Chọn 66f */
    .page-66f__features-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: var(--page-66f-spacing-md);
    }

    .page-66f__feature-item {
        background-color: #2a2a2a;
        padding: var(--page-66f-spacing-md);
        border-radius: var(--page-66f-border-radius);
        text-align: center;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
        transition: transform 0.3s ease;
        box-sizing: border-box;
    }

    .page-66f__feature-item:hover {
        transform: translateY(-5px);
    }

    .page-66f__feature-item img {
        max-width: 250px; /* Đảm bảo hình ảnh không nhỏ hơn 200px nếu container cho phép */
        height: auto;
        margin-bottom: 15px;
        object-fit: contain;
        display: block;
        margin-left: auto;
        margin-right: auto;
    }
    
    .page-66f__feature-item h3 {
        font-size: 1.3em;
        color: var(--page-66f-primary-color);
        margin-bottom: 10px;
    }

    .page-66f__feature-item p {
        color: #bbb;
        font-size: 0.95em;
    }

    /* Nút Nổi */
    .page-66f__floating-buttons {
        position: fixed;
        bottom: 20px;
        right: 20px;
        display: flex;
        flex-direction: column;
        gap: 10px;
        z-index: 1000;
    }

    .page-66f__floating-button {
        padding: 12px 20px;
        background-color: var(--page-66f-primary-color);
        color: var(--page-66f-text-color-light);
        border-radius: 50px;
        font-weight: bold;
        text-align: center;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
        transition: background-color 0.3s ease, transform 0.2s ease;
        border: none;
        cursor: pointer;
        font-size: 1em;
        min-width: 100px;
    }

    .page-66f__floating-button:hover {
        background-color: #f76b42;
        transform: translateY(-2px);
    }

    .page-66f__floating-button--login {
        background-color: #4a4a4a;
    }

    .page-66f__floating-button--login:hover {
        background-color: #6a6a6a;
    }

    /* Phần Câu Hỏi Thường Gặp (FAQ) */
    .page-66f__faq-list {
        list-style: none;
        padding: 0;
        margin: 0 auto;
        max-width: 800px;
    }

    .page-66f__faq-item {
        background-color: #2a2a2a;
        margin-bottom: 10px;
        border-radius: var(--page-66f-border-radius);
        overflow: hidden;
        box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    }

    .page-66f__faq-question {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 15px 20px;
        background-color: #3a3a3a;
        color: var(--page-66f-text-color-light);
        cursor: pointer;
        user-select: none;
        font-weight: bold;
        transition: background-color 0.3s ease;
    }

    .page-66f__faq-question:hover {
        background-color: #4a4a4a;
    }

    .page-66f__faq-question h3 {
        margin: 0;
        font-size: 1.1em;
        color: var(--page-66f-primary-color);
        pointer-events: none; /* Ngăn h3 chặn sự kiện click */
    }

    .page-66f__faq-toggle {
        font-size: 1.5em;
        line-height: 1;
        transition: transform 0.3s ease;
        pointer-events: none; /* Ngăn biểu tượng toggle chặn sự kiện click */
        color: var(--page-66f-accent-color);
    }

    .page-66f__faq-item.active .page-66f__faq-toggle {
        transform: rotate(45deg); /* Thay đổi + thành X hoặc tương tự khi mở */
    }

    .page-66f__faq-answer {
        max-height: 0;
        overflow: hidden;
        padding: 0 20px; /* Giảm padding cho trạng thái ban đầu */
        opacity: 0;
        transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
        color: #ccc;
    }

    .page-66f__faq-item.active .page-66f__faq-answer {
        max-height: 2000px !important; /* Đủ lớn để chứa mọi nội dung */
        padding: 20px !important; /* Trở lại padding đầy đủ */
        opacity: 1;
    }

    /* Thiết Kế Đáp Ứng (Responsive Design) */
    @media (max-width: 768px) {
        .page-66f__hero-content h1 {
            font-size: 2.5em;
        }

        .page-66f__hero-content p {
            font-size: 1.1em;
        }

        .page-66f__button {
            padding: 10px 20px;
            font-size: 0.9em;
        }

        .page-66f__section {
            padding: var(--page-66f-spacing-md) 15px;
        }

        .page-66f__header h2 {
            font-size: 2em;
        }

        .page-66f__product-grid,
        .page-66f__features-grid {
            grid-template-columns: 1fr;
        }

        .page-66f__product-card,
        .page-66f__feature-item,
        .page-66f__promotion-card {
            width: 100%;
            max-width: 100%;
            margin-left: 0;
            margin-right: 0;
            box-sizing: border-box !important;
        }

        .page-66f__product-card-image,
        .page-66f__promotion-image {
            height: 180px;
        }

        /* Yêu cầu đáp ứng cho các mục danh sách */
        .page-66f__faq-list {
            padding: 0 10px !important; /* Điều chỉnh cho màn hình nhỏ hơn */
            width: 100% !important;
            max-width: 100% !important;
            box-sizing: border-box !important;
            margin-left: 0 !important;
            margin-right: 0 !important;
        }
        .page-66f__faq-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-66f__faq-answer {
            padding: 0 15px !important; /* Điều chỉnh cho màn hình nhỏ hơn */
        }
        .page-66f__faq-item.active .page-66f__faq-answer {
            padding: 15px !important; /* Điều chỉnh cho màn hình nhỏ hơn */
        }

        .page-66f__floating-buttons {
            flex-direction: row;
            width: calc(100% - 40px);
            left: 20px;
            right: 20px;
            bottom: 15px;
            justify-content: space-around;
            gap: 10px;
        }

        .page-66f__floating-button {
            flex: 1;
            padding: 10px 15px;
            font-size: 0.9em;
            min-width: unset;
        }

        /* Tất cả hình ảnh đáp ứng */
        .page-66f img {
            max-width: 100% !important;
            height: auto !important;
            box-sizing: border-box !important;
            display: block;
        }
    }

    @media (max-width: 480px) {
        .page-66f__hero-content h1 {
            font-size: 2em;
        }
        .page-66f__hero-content p {
            font-size: 1em;
        }
        .page-66f__hero-buttons {
            flex-direction: column;
        }
        .page-66f__floating-buttons {
            bottom: 10px;
            left: 10px;
            right: 10px;
            width: calc(100% - 20px);
        }
    }