:root {
        --phut-90-primary-color: #e44d26; /* Cam đỏ */
        --phut-90-secondary-color: #2c3e50; /* Xanh đen */
        --phut-90-accent-color: #f1c40f; /* Vàng */
        --phut-90-background-dark: #1a1a1a;
        --phut-90-background-light: #f5f5f5;
        --phut-90-text-light: #ecf0f1;
        --phut-90-text-dark: #34495e;
        --phut-90-border-color: #333;
    }

    .page-phut-90 {
        font-family: 'Arial', sans-serif;
        color: var(--phut-90-text-light);
        background-color: var(--phut-90-background-dark);
        line-height: 1.6;
        padding-bottom: 80px; /* Khoảng trống cho nút nổi */
    }

    .page-phut-90__hero-section {
        position: relative;
        width: 100%;
        height: 60vh;
        min-height: 300px;
        display: flex;
        align-items: center;
        justify-content: center;
        text-align: center;
        overflow: hidden;
        padding-top: 10px; /* Khoảng cách nhỏ trang trí, giả định padding body được xử lý bởi CSS chung */
    }

    .page-phut-90__hero-image {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        object-fit: cover;
        z-index: 1;
    }

    .page-phut-90__hero-overlay {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.6);
        z-index: 2;
    }

    .page-phut-90__hero-content {
        position: relative;
        z-index: 3;
        max-width: 900px;
        padding: 20px;
    }

    .page-phut-90__hero-title {
        font-size: 2.8rem;
        color: var(--phut-90-accent-color);
        margin-bottom: 15px;
        text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
    }

    .page-phut-90__hero-description {
        font-size: 1.1rem;
        color: var(--phut-90-text-light);
        max-width: 700px;
        margin: 0 auto;
        text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5);
    }

    .page-phut-90__section-title {
        font-size: 2rem;
        color: var(--phut-90-accent-color);
        text-align: center;
        margin: 40px 0 20px;
        padding: 0 15px;
    }

    .page-phut-90__section-description {
        font-size: 1.1rem;
        text-align: center;
        max-width: 800px;
        margin: 0 auto 30px;
        color: var(--phut-90-text-light);
        padding: 0 15px;
    }

    .page-phut-90__products-section,
    .page-phut-90__promo-section,
    .page-phut-90__why-choose-us-section,
    .page-phut-90__faq-section {
        padding: 20px 0;
        margin: 0 auto;
        max-width: 1200px;
    }

    .page-phut-90__product-grid,
    .page-phut-90__features-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 25px;
        padding: 0 20px;
    }

    .page-phut-90__product-card,
    .page-phut-90__feature-item {
        background-color: var(--phut-90-secondary-color);
        border-radius: 10px;
        overflow: hidden;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
        text-align: center;
        transition: transform 0.3s ease, box-shadow 0.3s ease;
        box-sizing: border-box; /* Quan trọng cho danh sách phản hồi */
    }

    .page-phut-90__product-card:hover,
    .page-phut-90__feature-item:hover {
        transform: translateY(-5px);
        box-shadow: 0 8px 20px rgba(0, 0, 0, 0.5);
    }

    .page-phut-90__product-image,
    .page-phut-90__feature-icon {
        width: 100%;
        height: 250px;
        object-fit: cover;
        display: block;
    }

    .page-phut-90__feature-icon {
        height: 150px;
        width: 150px;
        margin: 20px auto 10px;
        border-radius: 50%;
        object-fit: contain;
        background-color: var(--phut-90-background-dark);
        border: 2px solid var(--phut-90-primary-color);
    }

    .page-phut-90__product-title,
    .page-phut-90__feature-title {
        font-size: 1.4rem;
        color: var(--phut-90-primary-color);
        margin: 15px 0 10px;
        padding: 0 15px;
    }

    .page-phut-90__product-text,
    .page-phut-90__feature-text {
        font-size: 0.95rem;
        color: var(--phut-90-text-light);
        padding: 0 15px 20px;
    }

    .page-phut-90__promo-card {
        display: flex;
        background-color: var(--phut-90-secondary-color);
        border-radius: 10px;
        overflow: hidden;
        margin-bottom: 25px;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
        transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .page-phut-90__promo-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 8px 20px rgba(0, 0, 0, 0.5);
    }

    .page-phut-90__promo-image {
        width: 40%;
        height: auto;
        object-fit: cover;
        display: block;
    }

    .page-phut-90__promo-content {
        padding: 20px;
        width: 60%;
        display: flex;
        flex-direction: column;
        justify-content: center;
    }

    .page-phut-90__promo-title {
        font-size: 1.5rem;
        color: var(--phut-90-accent-color);
        margin-bottom: 10px;
    }

    .page-phut-90__promo-text {
        font-size: 1rem;
        color: var(--phut-90-text-light);
    }

    .page-phut-90__button-wrapper {
        text-align: center;
        margin-top: 30px;
    }

    .page-phut-90__button {
        display: inline-block;
        background-color: var(--phut-90-primary-color);
        color: var(--phut-90-text-light);
        padding: 12px 25px;
        border-radius: 5px;
        text-decoration: none;
        font-weight: bold;
        transition: background-color 0.3s ease;
        cursor: pointer;
        border: none;
        font-size: 1rem;
    }

    .page-phut-90__button:hover {
        background-color: #c94020;
    }

    /* Nút nổi */
    .page-phut-90__floating-buttons {
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background-color: rgba(0, 0, 0, 0.8);
        display: flex;
        justify-content: space-around;
        padding: 10px 0;
        box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.5);
        z-index: 1000;
        box-sizing: border-box;
    }

    .page-phut-90__button--register,
    .page-phut-90__button--login {
        flex: 1;
        text-align: center;
        margin: 0 5px;
        padding: 12px 0;
        font-size: 1.1rem;
    }

    .page-phut-90__button--register {
        background-color: var(--phut-90-primary-color);
    }

    .page-phut-90__button--register:hover {
        background-color: #c94020;
    }

    .page-phut-90__button--login {
        background-color: var(--phut-90-secondary-color);
        border: 1px solid var(--phut-90-primary-color);
    }

    .page-phut-90__button--login:hover {
        background-color: #3f5872;
    }

    /* Phần FAQ */
    .page-phut-90__faq-container {
        max-width: 800px;
        margin: 0 auto;
        padding: 0 20px;
    }

    .page-phut-90__faq-item {
        background-color: var(--phut-90-secondary-color);
        margin-bottom: 10px;
        border-radius: 8px;
        overflow: hidden;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    }

    .page-phut-90__faq-question {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 15px 20px;
        background-color: #3a4b5d;
        cursor: pointer;
        user-select: none;
        border-bottom: 1px solid var(--phut-90-border-color);
        transition: background-color 0.3s ease;
    }

    .page-phut-90__faq-question:hover {
        background-color: #4a5c70;
    }

    .page-phut-90__faq-question h3 {
        margin: 0;
        font-size: 1.15rem;
        color: var(--phut-90-text-light);
        pointer-events: none; /* Ngăn h3 chặn sự kiện click */
    }

    .page-phut-90__faq-toggle {
        font-size: 1.5rem;
        font-weight: bold;
        color: var(--phut-90-accent-color);
        transition: transform 0.3s ease;
        pointer-events: none; /* Ngăn toggle chặn sự kiện click */
    }

    .page-phut-90__faq-answer {
        max-height: 0;
        overflow: hidden;
        padding: 0 15px;
        opacity: 0;
        transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
        color: var(--phut-90-text-light);
    }

    .page-phut-90__faq-answer p {
        padding: 10px 0;
        margin: 0;
    }

    .page-phut-90__faq-item.active .page-phut-90__faq-question {
        background-color: var(--phut-90-primary-color);
        border-bottom-color: var(--phut-90-primary-color);
    }

    .page-phut-90__faq-item.active .page-phut-90__faq-answer {
        max-height: 2000px !important; /* Đủ lớn để chứa nội dung */
        padding: 20px 15px !important;
        opacity: 1;
    }

    .page-phut-90__faq-item.active .page-phut-90__faq-toggle {
        transform: rotate(45deg); /* Thay đổi + thành X hoặc - */
        /* content: "\2212"; */ /* Đã được xử lý bằng JS */
    }

    /* Điều chỉnh phản hồi */
    @media (max-width: 768px) {
        .page-phut-90__hero-title {
            font-size: 2rem;
        }
        .page-phut-90__hero-description {
            font-size: 1rem;
        }
        .page-phut-90__section-title {
            font-size: 1.7rem;
        }
        .page-phut-90__section-description {
            font-size: 1rem;
        }

        .page-phut-90__product-grid,
        .page-phut-90__features-grid {
            grid-template-columns: 1fr;
            padding: 0 15px;
        }
        .page-phut-90__product-card,
        .page-phut-90__feature-item {
            width: 100% !important;
            box-sizing: border-box !important;
            margin-left: 0 !important;
            margin-right: 0 !important;
        }

        .page-phut-90__product-image,
        .page-phut-90__feature-icon {
            max-width: 100% !important;
            height: auto !important;
            box-sizing: border-box !important;
            overflow: hidden !important;
        }

        .page-phut-90__promo-card {
            flex-direction: column;
            margin: 0 15px 25px;
        }
        .page-phut-90__promo-image {
            width: 100%;
            height: 200px;
        }
        .page-phut-90__promo-content {
            width: 100%;
            padding: 15px;
        }
        .page-phut-90__promo-title {
            font-size: 1.3rem;
        }
        .page-phut-90__promo-text {
            font-size: 0.9rem;
        }

        .page-phut-90__floating-buttons {
            padding: 8px 0;
        }
        .page-phut-90__button--register,
        .page-phut-90__button--login {
            font-size: 1rem;
            padding: 10px 0;
        }

        .page-phut-90__faq-question {
            padding: 12px 15px;
        }
        .page-phut-90__faq-question h3 {
            font-size: 1rem;
        }
        .page-phut-90__faq-answer {
            padding: 0 15px;
            word-wrap: break-word !important;
            overflow-wrap: break-word !important;
            word-break: break-word !important;
        }
        .page-phut-90__faq-item.active .page-phut-90__faq-answer {
            padding: 15px 15px !important;
        }

        /* Đảm bảo tất cả hình ảnh phản hồi */
        img {
            max-width: 100% !important;
            height: auto !important;
        }
        .page-phut-90__product-image, .page-phut-90__feature-icon, .page-phut-90__promo-image {
            max-width: 100% !important;
            height: auto !important;
            box-sizing: border-box !important;
            overflow: hidden !important;
        }

        .page-phut-90__faq-container {
            width: 100% !important;
            max-width: 100% !important;
            box-sizing: border-box !important;
            padding: 0 !important;
            margin-left: 0 !important;
            margin-right: 0 !important;
        }

        .page-phut-90__faq-item {
             margin-left: 15px;
             margin-right: 15px;
        }
    }

    @media (min-width: 769px) and (max-width: 1024px) {
        .page-phut-90__hero-title {
            font-size: 2.5rem;
        }
        .page-phut-90__product-grid,
        .page-phut-90__features-grid {
            grid-template-columns: repeat(2, 1fr);
        }
        .page-phut-90__promo-card {
            margin: 0 20px 25px;
        }
    }

    @media (min-width: 1025px) {
        .page-phut-90__promo-card {
            margin: 0 auto 25px;
            max-width: 900px;
        }
        .page-phut-90__hero-section {
            height: 70vh;
        }
    }