:root {
    --primary-color: #11A84E;
    --secondary-color: #22C768;
    --button-gradient: linear-gradient(180deg, #2AD16F 0%, #13994A 100%);
    --card-bg: #11271B;
    --background: #08160F;
    --text-main: #F2FFF6;
    --text-secondary: #A7D9B8;
    --border-color: #2E7A4E;
    --glow-color: #57E38D;
    --gold-color: #F2C14E;
    --divider-color: #1E3A2A;
    --deep-green: #0A4B2C;
}

/* body đã padding-top: var(--header-offset)；trang này cấm viết lại biến đó */
.page-register {
    font-family: 'Arial', sans-serif;
    color: var(--text-main); /* Nền tối, chữ sáng */
    background-color: var(--background); /* Nền trang tổng thể */
    line-height: 1.6;
}

.page-register__container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    box-sizing: border-box;
}

.page-register__hero-section {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 10px 0 60px 0; /* Khoảng đệm trên nhỏ, sau đó là nội dung */
    overflow: hidden;
    color: var(--text-main);
}

.page-register__hero-image-wrapper {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 0;
}

.page-register__hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: brightness(0.5); /* Làm tối hình ảnh để dễ đọc chữ */
    /* Không có bộ lọc thay đổi màu sắc, chỉ độ sáng để tăng độ tương phản */
    min-width: 200px;
    min-height: 200px;
}

.page-register__hero-content {
    position: relative;
    z-index: 1;
    max-width: 900px;
    padding: 40px 20px;
    box-sizing: border-box;
}

.page-register__main-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--gold-color); /* Sử dụng màu vàng cho điểm nhấn */
    text-shadow: 0 0 10px rgba(87, 227, 141, 0.5);
}

.page-register__lead-text {
    font-size: 1.2rem;
    margin-bottom: 30px;
    color: var(--text-secondary);
}

.page-register__cta-button {
    display: inline-block;
    padding: 15px 30px;
    background: var(--button-gradient);
    color: var(--text-main);
    text-decoration: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: bold;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    max-width: 100%;
    box-sizing: border-box;
    white-space: normal;
    word-wrap: break-word;
}

.page-register__cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
    opacity: 0.9;
}

.page-register__section-title {
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 700;
    margin-bottom: 30px;
    text-align: center;
    color: var(--gold-color);
    text-shadow: 0 0 8px rgba(87, 227, 141, 0.3);
}

.page-register__paragraph {
    font-size: 1rem;
    margin-bottom: 15px;
    color: var(--text-secondary);
}

.page-register__intro-section,
.page-register__how-to-register-section,
.page-register__promotions-section,
.page-register__cta-section {
    padding: 60px 0;
    background-color: var(--background); /* Đảm bảo nền nhất quán cho các phần nền sáng */
    color: var(--text-main);
}

.page-register__dark-section {
    padding: 60px 0;
    background-color: var(--card-bg); /* Nền tối hơn để tương phản */
    color: var(--text-main);
}

/* Điều chỉnh màu chữ cụ thể cho các phần nền tối */
.page-register__dark-section .page-register__paragraph,
.page-register__dark-section .page-register__feature-description,
.page-register__dark-section .page-register__security-description,
.page-register__dark-section .page-register__promo-description {
    color: var(--text-secondary);
}

.page-register__dark-section .page-register__section-title,
.page-register__dark-section .page-register__feature-title,
.page-register__dark-section .page-register__security-feature-title,
.page-register__dark-section .page-register__promo-title,
.page-register__dark-section .page-register__faq-qtext {
    color: var(--text-main);
}

.page-register__features-grid,
.page-register__steps-grid,
.page-register__promo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 40px;
    margin-bottom: 40px;
}

.page-register__feature-card,
.page-register__step-card,
.page-register__promo-card {
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    text-align: center;
    transition: transform 0.3s ease;
    border: 1px solid var(--border-color);
}

.page-register__feature-card:hover,
.page-register__promo-card:hover {
    transform: translateY(-5px);
}

.page-register__feature-icon,
.page-register__promo-image,
.page-register__content-image {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto 20px auto;
    border-radius: 8px;
    min-width: 200px;
    min-height: 200px;
}

.page-register__feature-title,
.page-register__promo-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-main);
}

.page-register__step-number {
    width: 50px;
    height: 50px;
    background: var(--button-gradient);
    color: var(--text-main);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    font-weight: bold;
    margin: 0 auto 20px auto;
}

.page-register__step-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-main);
}

.page-register__cta-center {
    text-align: center;
    margin-top: 40px;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    overflow: hidden;
}

.page-register__cta-button--large {
    padding: 18px 40px;
    font-size: 1.25rem;
}

.page-register__security-list {
    list-style: none;
    padding: 0;
    margin-top: 40px;
}

.page-register__security-item {
    background-color: var(--background); /* Hơi sáng hơn card-bg cho các mục danh sách */
    padding: 25px;
    margin-bottom: 20px;
    border-radius: 8px;
    border: 1px solid var(--divider-color);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
}

.page-register__security-feature-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--gold-color);
}

.page-register__security-description {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.page-register__faq-list {
    margin-top: 40px;
}

.page-register__faq-item {
    background-color: var(--background);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 15px;
    overflow: hidden;
    color: var(--text-main);
}

.page-register__faq-item summary {
    list-style: none; /* Ẩn dấu mặc định */
    padding: 20px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-main);
    background-color: var(--card-bg);
    border-bottom: 1px solid transparent; /* mặc định */
    transition: background-color 0.3s ease;
}

.page-register__faq-item summary::-webkit-details-marker {
    display: none; /* Ẩn dấu mặc định cho trình duyệt webkit */
}

.page-register__faq-item[open] summary {
    border-bottom-color: var(--border-color);
    background-color: var(--deep-green);
}

.page-register__faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.page-register__faq-toggle {
    font-size: 1.5rem;
    line-height: 1;
    margin-left: 15px;
    color: var(--gold-color);
}

.page-register__faq-answer {
    padding: 20px;
    font-size: 1rem;
    color: var(--text-secondary);
}

.page-register__faq-answer p {
    margin-bottom: 0;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .page-register__main-title {
        font-size: clamp(2rem, 4.5vw, 3rem);
    }
    .page-register__section-title {
        font-size: clamp(1.8rem, 3.5vw, 2.5rem);
    }
}

@media (max-width: 768px) {
    .page-register__hero-content {
        padding: 20px;
    }
    .page-register__main-title {
        font-size: clamp(1.8rem, 7vw, 2.5rem);
        margin-bottom: 15px;
    }
    .page-register__lead-text {
        font-size: 1rem;
        margin-bottom: 20px;
    }
    .page-register__cta-button {
        padding: 12px 25px;
        font-size: 1rem;
    }
    .page-register__section-title {
        font-size: clamp(1.5rem, 6vw, 2rem);
        margin-bottom: 25px;
    }
    .page-register__paragraph {
        font-size: 0.95rem;
    }

    .page-register__intro-section,
    .page-register__how-to-register-section,
    .page-register__promotions-section,
    .page-register__cta-section,
    .page-register__dark-section {
        padding: 40px 0;
    }

    .page-register__container {
        padding: 0 15px !important; /* Thêm khoảng đệm cho di động */
    }

    .page-register__features-grid,
    .page-register__steps-grid,
    .page-register__promo-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        margin-top: 30px;
        margin-bottom: 30px;
    }

    .page-register__feature-card,
    .page-register__step-card,
    .page-register__promo-card {
        padding: 20px;
    }

    .page-register__feature-title,
    .page-register__promo-title {
        font-size: 1.3rem;
    }

    .page-register__step-number {
        width: 40px;
        height: 40px;
        font-size: 1.5rem;
    }

    .page-register__step-title {
        font-size: 1.2rem;
    }

    .page-register__security-item {
        padding: 15px;
        margin-bottom: 15px;
    }

    .page-register__security-feature-title {
        font-size: 1.1rem;
    }

    .page-register__faq-item summary {
        padding: 15px;
        font-size: 1rem;
    }

    .page-register__faq-toggle {
        font-size: 1.3rem;
    }

    .page-register__faq-answer {
        padding: 15px;
        font-size: 0.9rem;
    }

    /* Khả năng phản hồi hình ảnh trên di động */
    .page-register img {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
        display: block !important;
    }
    
    .page-register__hero-image-wrapper,
    .page-register__container,
    .page-register__feature-card,
    .page-register__step-card,
    .page-register__promo-card,
    .page-register__security-item,
    .page-register__faq-item {
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
        overflow: hidden !important; /* Đảm bảo không tràn */
    }

    /* Khả năng phản hồi nút trên di động */
    .page-register__cta-button,
    .page-register a[class*="button"],
    .page-register a[class*="btn"] {
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
        white-space: normal !important;
        word-wrap: break-word !important;
        padding-left: 15px;
        padding-right: 15px;
    }
    
    .page-register__cta-center {
        display: flex;
        flex-direction: column; /* Xếp chồng các nút theo chiều dọc */
        gap: 15px;
        align-items: center;
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
        overflow: hidden !important;
    }
}

/* Không có bộ lọc CSS cho hình ảnh */
.page-register img {
    filter: none; /* Đảm bảo không có bộ lọc không mong muốn */
}

/* Đặt màu chữ rõ ràng để tương phản khi cần */
.page-register h1, .page-register h2, .page-register h3, .page-register h4, .page-register h5, .page-register h6 {
    color: var(--text-main); /* Mặc định màu chữ chính cho tiêu đề */
}

/* Ghi đè cho các phần cụ thể nếu cần */
.page-register__intro-section .page-register__section-title,
.page-register__how-to-register-section .page-register__section-title,
.page-register__promotions-section .page-register__section-title,
.page-register__cta-section .page-register__section-title {
    color: var(--gold-color);
}
.page-register__intro-section .page-register__paragraph,
.page-register__how-to-register-section .page-register__paragraph,
.page-register__promotions-section .page-register__paragraph,
.page-register__cta-section .page-register__paragraph {
    color: var(--text-secondary);
}

/* Đảm bảo kích thước hình ảnh tối thiểu */
.page-register__feature-icon,
.page-register__promo-image,
.page-register__content-image,
.page-register__faq-visual {
    min-width: 200px;
    min-height: 200px;
}