:root {
    --primary-color: #2F6BFF;
    --secondary-color: #6FA3FF;
    --text-main: #1F2D3D;
    --text-black: #000000;
    --card-bg: #FFFFFF;
    --background-color: #F4F7FB;
    --border-color: #D6E2FF;
    --glow-color: #A5C4FF;
    --button-gradient: linear-gradient(180deg, #4A8BFF 0%, #2F6BFF 100%);
}

.page-register {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: var(--text-main); /* Default text color for light background body */
    background-color: var(--background-color);
}

.page-register__container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 15px;
}

.page-register__hero-section {
    position: relative;
    padding-top: 10px; /* Small top padding, body handles --header-offset */
    color: var(--card-bg); /* White text for hero section */
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    background-color: var(--primary-color);
}

.page-register__hero-image {
    width: 100%;
    max-height: 500px; /* Limit height for aesthetic */
    overflow: hidden;
    position: relative;
    z-index: 1;
}

.page-register__hero-image img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
    aspect-ratio: 16/9;
}

.page-register__hero-content {
    position: relative;
    z-index: 2;
    padding: 40px 15px 60px;
    max-width: 800px;
    box-sizing: border-box;
}

.page-register__main-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
    color: var(--card-bg);
}

.page-register__hero-description {
    font-size: 1.2rem;
    margin-bottom: 30px;
    color: var(--card-bg);
}

.page-register__section-title {
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 20px;
    color: var(--text-main);
}

.page-register__section-description {
    font-size: 1.1rem;
    text-align: center;
    max-width: 800px;
    margin: 0 auto 40px;
    color: var(--text-main);
}

.page-register__why-join-section,
.page-register__promotions-section,
.page-register__faq-section {
    padding: 60px 0;
    background-color: var(--background-color);
}

.page-register__light-bg .page-register__section-title,
.page-register__light-bg .page-register__section-description {
    color: var(--text-main);
}

.page-register__dark-bg {
    background-color: var(--primary-color);
    color: var(--card-bg);
    padding: 60px 0;
}

.page-register__dark-bg .page-register__section-title,
.page-register__dark-bg .page-register__section-description {
    color: var(--card-bg);
}

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

.page-register__feature-card,
.page-register__promo-card {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    text-align: center;
    color: var(--text-main);
}

.page-register__feature-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.page-register__promo-card img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto 20px;
    border-radius: 8px;
    object-fit: cover;
}

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

.page-register__btn {
    display: inline-block;
    padding: 14px 30px;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    text-align: center;
    max-width: 100%;
    box-sizing: border-box;
    white-space: normal;
    word-wrap: break-word;
}

.page-register__btn--primary {
    background: var(--button-gradient);
    color: var(--card-bg);
    border: none;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.page-register__btn--primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.page-register__btn--secondary {
    background: var(--card-bg);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.page-register__btn--secondary:hover {
    background: var(--primary-color);
    color: var(--card-bg);
}

.page-register__btn--link {
    background: transparent;
    color: var(--primary-color);
    border: none;
    padding: 0;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: underline;
}

.page-register__btn--link:hover {
    color: var(--text-black);
}

.page-register__steps-section {
    padding: 60px 0;
    background-color: var(--card-bg);
}

.page-register__step-list {
    display: flex;
    flex-direction: column;
    gap: 40px;
    margin-top: 40px;
}

.page-register__step-item {
    display: flex;
    align-items: flex-start;
    gap: 25px;
    max-width: 900px;
    margin: 0 auto;
}

.page-register__step-icon {
    width: 50px;
    height: 50px;
    min-width: 50px;
    border-radius: 50%;
    background: var(--primary-color);
    color: var(--card-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    font-weight: 700;
    flex-shrink: 0;
}

.page-register__step-content {
    flex: 1;
    text-align: left;
}

.page-register__step-content img {
    max-width: 100%;
    height: auto;
    display: block;
    margin-top: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    object-fit: cover;
}

.page-register__step-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-top: 0;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.page-register__security-section {
    padding: 60px 0;
}

.page-register__security-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 50px;
    margin-top: 40px;
    flex-wrap: wrap;
}

.page-register__security-content img {
    max-width: 400px;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
    object-fit: cover;
}

.page-register__security-list {
    list-style: none;
    padding: 0;
    margin: 0;
    text-align: left;
    max-width: 500px;
}

.page-register__security-list li {
    font-size: 1.1rem;
    margin-bottom: 15px;
    position: relative;
    padding-left: 30px;
}

.page-register__security-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
    font-size: 1.2rem;
}

.page-register__faq-section {
    padding: 60px 0;
}

.page-register__faq-list {
    max-width: 900px;
    margin: 40px auto 0;
}

details.page-register__faq-item {
  margin-bottom: 15px;
  border-radius: 5px;
  border: 1px solid var(--border-color);
  overflow: hidden;
  background: var(--card-bg);
}
details.page-register__faq-item summary.page-register__faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 20px;
  cursor: pointer;
  user-select: none;
  list-style: none;
  transition: background-color 0.3s ease;
}
details.page-register__faq-item summary.page-register__faq-question::-webkit-details-marker {
  display: none;
}
details.page-register__faq-item summary.page-register__faq-question:hover {
  background: #f5f5f5;
}
.page-register__faq-qtext {
  flex: 1;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  text-align: left;
  color: var(--text-main);
}
.page-register__faq-toggle {
  font-size: 24px;
  font-weight: bold;
  color: var(--primary-color);
  flex-shrink: 0;
  margin-left: 15px;
  width: 28px;
  text-align: center;
}
details.page-register__faq-item .page-register__faq-answer {
  padding: 0 20px 20px;
  background: var(--background-color);
  border-radius: 0 0 5px 5px;
  color: var(--text-main);
}
.page-register__faq-answer p {
    margin-top: 0;
    margin-bottom: 0;
}


.page-register__cta-section {
    padding: 80px 0;
    text-align: center;
}

/* Universal image responsive styles */
.page-register img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Universal button container responsive styles */
.page-register__btn-container,
.page-register__cta-buttons {
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    overflow: hidden;
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap; /* Allow wrapping for multiple buttons */
}

/* --- Media Queries --- */

/* Tablet and smaller desktops */
@media (max-width: 1024px) {
    .page-register__hero-content {
        padding: 30px 15px 40px;
    }
    .page-register__main-title {
        font-size: clamp(2rem, 5vw, 3rem);
    }
    .page-register__hero-description {
        font-size: 1.1rem;
    }
    .page-register__section-title {
        font-size: clamp(1.8rem, 4vw, 2.4rem);
    }
    .page-register__section-description {
        font-size: 1rem;
    }
    .page-register__why-join-section,
    .page-register__steps-section,
    .page-register__security-section,
    .page-register__promotions-section,
    .page-register__faq-section,
    .page-register__cta-section {
        padding: 40px 0;
    }
    .page-register__features-grid,
    .page-register__promo-grid {
        gap: 20px;
    }
    .page-register__feature-card,
    .page-register__promo-card {
        padding: 25px;
    }
    .page-register__step-item {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    .page-register__step-icon {
        margin-bottom: 15px;
    }
    .page-register__step-content {
        text-align: center;
    }
    .page-register__security-content {
        gap: 30px;
    }
    .page-register__security-list {
        max-width: 100%;
        padding: 0 15px;
    }
    .page-register__security-list li {
        text-align: left;
    }
}

/* Mobile */
@media (max-width: 768px) {
    /* HERO Chủ Ảnh Khu Vực */
    .page-register__hero-section {
        padding-top: 10px;
    }
    .page-register__hero-image img {
        object-fit: contain !important;
        aspect-ratio: unset !important;
        width: 100% !important;
        height: auto !important;
    }
    .page-register__hero-content {
        padding: 20px 15px 30px;
    }
    .page-register__main-title {
        font-size: clamp(1.8rem, 8vw, 2.5rem);
        margin-bottom: 15px;
    }
    .page-register__hero-description {
        font-size: 1rem;
        margin-bottom: 25px;
    }

    /* Tiêu đề trang trí + Khu vực SEO văn bản dài */
    .page-register__section-title {
        font-size: clamp(1.5rem, 7vw, 2rem);
        padding: 0 10px;
        word-break: break-word;
    }
    .page-register__section-description {
        font-size: 0.95rem;
        margin-bottom: 30px;
        padding: 0 10px;
    }
    .page-register__article-body {
        max-width: 100% !important;
        padding: 0 15px;
        box-sizing: border-box;
    }
    .page-register__article-figure {
        max-width: 100% !important;
        margin-left: auto;
        margin-right: auto;
        display: block;
    }

    /* Hình ảnh và vùng chứa chung */
    .page-register img {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
    }
    .page-register__section,
    .page-register__card,
    .page-register__container,
    .page-register__step-item,
    .page-register__security-content {
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
        padding-left: 15px;
        padding-right: 15px;
    }

    /* Nút và vùng chứa nút */
    .page-register__btn,
    .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: 12px 15px;
        font-size: 1rem;
    }
    .page-register__btn-container,
    .page-register__cta-buttons,
    .page-register__button-group {
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
        padding-left: 15px;
        padding-right: 15px;
        flex-direction: column !important;
        gap: 15px;
    }

    /* FAQ */
    details.page-register__faq-item summary.page-register__faq-question { padding: 15px; }
    .page-register__faq-qtext { font-size: 15px; }
    details.page-register__faq-item .page-register__faq-answer { padding: 0 15px 15px; }

    /* Phần đệm chung của các khu vực */
    .page-register__why-join-section,
    .page-register__steps-section,
    .page-register__security-section,
    .page-register__promotions-section,
    .page-register__faq-section,
    .page-register__cta-section {
        padding: 30px 0;
    }

    .page-register__features-grid,
    .page-register__promo-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .page-register__step-item {
        gap: 15px;
    }
    .page-register__step-icon {
        width: 40px;
        height: 40px;
        min-width: 40px;
        font-size: 1.5rem;
    }
    .page-register__step-title {
        font-size: 1.3rem;
    }
    .page-register__security-content {
        flex-direction: column;
        gap: 20px;
    }
    .page-register__security-list {
        padding: 0 10px;
    }
    .page-register__security-list li {
        font-size: 1rem;
    }
}