/* style/blog.css */

/* Biến CSS */
:root {
    --page-blog-primary-color: #113B7A;
    --page-blog-secondary-color: #1D5FD1;
    --page-blog-card-bg: #10233F;
    --page-blog-text-main: #F3F8FF;
    --page-blog-text-secondary: #AFC4E8;
    --page-blog-border-color: #244D84;
    --page-blog-glow-color: #4FA8FF;
    --page-blog-gold-color: #F2C14E;
    --page-blog-divider-color: #1B3357;
    --page-blog-deep-navy: #08162B;
    --page-blog-button-gradient: linear-gradient(180deg, #2B73F6 0%, #1144A6 100%);
}

.page-blog {
    font-family: 'Arial', sans-serif;
    color: var(--page-blog-text-main); /* Đảm bảo màu chữ sáng trên nền tối của body */
    background-color: var(--page-blog-deep-navy); /* Nền của main, nếu cần */
}

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

.page-blog__section {
    padding: 60px 0;
    position: relative;
    overflow: hidden;
}

.page-blog__dark-section {
    background-color: var(--page-blog-deep-navy);
    color: var(--page-blog-text-main);
}

/* Hero Section */
.page-blog__hero-section {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 10px; /* Nhỏ hơn so với header offset */
    padding-bottom: 60px;
    background-color: var(--page-blog-deep-navy);
    overflow: hidden;
}

.page-blog__hero-image {
    position: relative;
    width: 100%;
    max-height: 600px; /* Giới hạn chiều cao */
    overflow: hidden;
}

.page-blog__hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.page-blog__hero-content {
    position: relative;
    z-index: 2;
    padding: 30px 20px;
    max-width: 900px;
    margin-top: -100px; /* Kéo lên trên hình ảnh một chút để tạo sự liền mạch */
    background-color: rgba(16, 35, 63, 0.9); /* Card BG với độ trong suốt */
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.5);
    border: 1px solid var(--page-blog-border-color);
}

.page-blog__main-title {
    font-size: clamp(2.2rem, 4vw, 3.5rem);
    font-weight: 700;
    color: var(--page-blog-gold-color);
    margin-bottom: 20px;
    line-height: 1.2;
    text-shadow: 0 0 10px rgba(242, 193, 78, 0.5);
}

.page-blog__description {
    font-size: 1.1rem;
    color: var(--page-blog-text-secondary);
    line-height: 1.6;
    margin-bottom: 30px;
}

.page-blog__cta-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.page-blog__btn-primary,
.page-blog__btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 15px 30px;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    box-sizing: border-box;
    white-space: normal;
    word-wrap: break-word;
    max-width: 100%;
}

.page-blog__btn-primary {
    background: var(--page-blog-button-gradient);
    color: #ffffff;
    border: none;
    box-shadow: 0 4px 15px rgba(43, 115, 246, 0.4);
}

.page-blog__btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(43, 115, 246, 0.6);
}

.page-blog__btn-secondary {
    background: transparent;
    color: var(--page-blog-gold-color);
    border: 2px solid var(--page-blog-gold-color);
}

.page-blog__btn-secondary:hover {
    background-color: rgba(242, 193, 78, 0.1);
    transform: translateY(-3px);
}

/* Section Title */
.page-blog__section-title {
    font-size: clamp(1.8rem, 3.5vw, 2.8rem);
    color: var(--page-blog-gold-color);
    text-align: center;
    margin-bottom: 40px;
    font-weight: 700;
    text-shadow: 0 0 8px rgba(242, 193, 78, 0.3);
}

.page-blog__section-intro {
    font-size: 1rem;
    color: var(--page-blog-text-secondary);
    text-align: center;
    max-width: 800px;
    margin: -20px auto 50px auto;
    line-height: 1.6;
}

/* Latest Articles Grid */
.page-blog__latest-articles {
    background-color: var(--page-blog-deep-navy);
}

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

.page-blog__article-card {
    background-color: var(--page-blog-card-bg);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--page-blog-border-color);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.page-blog__article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
}

.page-blog__article-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.page-blog__article-image {
    width: 100%;
    height: 220px;
    object-fit: cover;
    display: block;
}

.page-blog__article-title {
    font-size: 1.3rem;
    color: var(--page-blog-text-main);
    margin: 15px 20px 10px;
    line-height: 1.4;
    font-weight: 600;
}

.page-blog__article-excerpt {
    font-size: 0.95rem;
    color: var(--page-blog-text-secondary);
    padding: 0 20px;
    margin-bottom: 15px;
    flex-grow: 1;
    line-height: 1.5;
}

.page-blog__article-date {
    font-size: 0.85rem;
    color: var(--page-blog-text-secondary);
    opacity: 0.7;
    margin: 0 20px 10px;
}

.page-blog__read-more {
    display: inline-block;
    background-color: var(--page-blog-secondary-color);
    color: #ffffff;
    padding: 8px 15px;
    border-radius: 5px;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    margin: 0 20px 20px;
    transition: background-color 0.3s ease;
}

.page-blog__read-more:hover {
    background-color: #1a4bbd;
}

.page-blog__view-all-button {
    text-align: center;
    margin-top: 50px;
}

/* Guide Sections */
.page-blog__guide-section {
    padding: 80px 0;
    background-color: var(--page-blog-deep-navy);
}

.page-blog__guide-section h2 {
    margin-bottom: 50px;
}

.page-blog__content-text {
    max-width: 900px;
    margin: 0 auto 40px;
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--page-blog-text-secondary);
}

.page-blog__content-text h3 {
    font-size: 1.6rem;
    color: var(--page-blog-gold-color);
    margin-top: 40px;
    margin-bottom: 20px;
    font-weight: 600;
}

.page-blog__content-text p {
    margin-bottom: 20px;
}

.page-blog__content-text ul {
    list-style: disc;
    margin-left: 25px;
    margin-bottom: 20px;
}

.page-blog__content-text li {
    margin-bottom: 10px;
}

/* FAQ Section */
.page-blog__faq-section {
    padding: 80px 0;
    background-color: var(--page-blog-deep-navy);
}

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

details.page-blog__faq-item {
  margin-bottom: 15px;
  border-radius: 5px;
  border: 1px solid var(--page-blog-border-color);
  overflow: hidden;
  background: var(--page-blog-card-bg);
}
details.page-blog__faq-item summary.page-blog__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-blog__faq-item summary.page-blog__faq-question::-webkit-details-marker {
  display: none;
}
details.page-blog__faq-item summary.page-blog__faq-question:hover {
  background: rgba(var(--page-blog-primary-color), 0.2);
}
.page-blog__faq-qtext {
  flex: 1;
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.5;
  text-align: left;
  color: var(--page-blog-text-main);
}
.page-blog__faq-toggle {
  font-size: 24px;
  font-weight: bold;
  color: var(--page-blog-gold-color);
  flex-shrink: 0;
  margin-left: 15px;
  width: 28px;
  text-align: center;
}
details.page-blog__faq-item .page-blog__faq-answer {
  padding: 0 20px 20px;
  background: rgba(var(--page-blog-primary-color), 0.1);
  border-radius: 0 0 5px 5px;
  color: var(--page-blog-text-secondary);
  font-size: 1rem;
  line-height: 1.6;
}

/* General Image Styling for Responsiveness */
.page-blog img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Mobile Responsiveness */
@media (max-width: 1024px) {
    .page-blog__hero-content {
        margin-top: -80px;
        padding: 25px 15px;
    }
    .page-blog__main-title {
        font-size: clamp(2rem, 5vw, 3rem);
    }
    .page-blog__description {
        font-size: 1rem;
    }
    .page-blog__section {
        padding: 50px 0;
    }
    .page-blog__article-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 20px;
    }
    .page-blog__article-title {
        font-size: 1.2rem;
    }
    .page-blog__content-text h3 {
        font-size: 1.4rem;
    }
}

@media (max-width: 768px) {
    /* HERO 主图区域 */
    .page-blog__hero-section {
        padding-bottom: 40px;
        padding-top: 10px;
    }
    .page-blog__hero-image img {
        object-fit: contain !important; /* 强制 contain */
        aspect-ratio: unset !important; /* Bỏ aspect ratio */
        height: auto !important;
    }
    .page-blog__hero-content {
        margin-top: -60px; /* Điều chỉnh vị trí */
        padding: 20px 15px;
        max-width: calc(100% - 30px); /* Đảm bảo padding bên trong */
    }
    .page-blog__main-title {
        font-size: clamp(1.8rem, 6vw, 2.5rem);
        margin-bottom: 15px;
    }
    .page-blog__description {
        font-size: 0.95rem;
        margin-bottom: 20px;
    }
    .page-blog__cta-buttons {
        flex-direction: column; /* Nút xếp chồng */
        gap: 15px;
    }
    .page-blog__btn-primary,
    .page-blog__btn-secondary {
        width: 100% !important;
        max-width: 100% !important;
        padding: 12px 20px;
        font-size: 1rem;
    }

    /* 通用图片与容器 */
    .page-blog img {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
    }
    .page-blog__container,
    .page-blog__section,
    .page-blog__article-card,
    .page-blog__faq-item {
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
        padding-left: 15px;
        padding-right: 15px;
    }
    .page-blog__section {
        padding: 40px 0;
    }
    .page-blog__section-title {
        font-size: clamp(1.6rem, 5vw, 2.2rem);
        margin-bottom: 30px;
    }
    .page-blog__section-intro {
        font-size: 0.9rem;
        margin: -15px auto 30px auto;
    }

    /* 产品展示图区域 (Article Grid) */
    .page-blog__article-grid {
        grid-template-columns: 1fr; /* Một cột */
        gap: 25px;
    }
    .page-blog__article-image {
        height: 180px;
    }
    .page-blog__article-title {
        font-size: 1.1rem;
        margin: 15px 15px 10px;
    }
    .page-blog__article-excerpt,
    .page-blog__article-date,
    .page-blog__read-more {
        padding-left: 15px;
        padding-right: 15px;
        margin-left: 15px;
        margin-right: 15px;
    }
    .page-blog__read-more {
        margin-bottom: 15px;
    }

    /* 装饰主标题 + 长文 SEO 区 */
    .page-blog__content-text {
        font-size: 0.95rem;
        margin-bottom: 30px;
        padding: 0 5px;
    }
    .page-blog__content-text h3 {
        font-size: 1.3rem;
        margin-top: 30px;
        margin-bottom: 15px;
    }
    .page-blog__content-text p, .page-blog__content-text li {
        text-align: left; /* Đảm bảo căn trái */
    }

    /* FAQ */
    details.page-blog__faq-item summary.page-blog__faq-question {
        padding: 15px;
    }
    .page-blog__faq-qtext {
        font-size: 1rem;
    }
    .page-blog__faq-toggle {
        font-size: 20px;
        width: 24px;
        margin-left: 10px;
    }
    details.page-blog__faq-item .page-blog__faq-answer {
        padding: 0 15px 15px;
        font-size: 0.95rem;
    }
}

/* Màu sắc tương phản an toàn */
.page-blog__content-area, .page-blog__text-block {
    color: var(--page-blog-text-main);
    background: var(--page-blog-deep-navy);
}
.page-blog p, .page-blog li {
    color: var(--page-blog-text-secondary);
}
.page-blog__card {
    background: var(--page-blog-card-bg);
    color: var(--page-blog-text-main);
    border: 1px solid var(--page-blog-border-color);
}
.page-blog__dark-section {
    background: var(--page-blog-deep-navy);
    color: var(--page-blog-text-main);
}
.page-blog__btn-primary {
    background: var(--page-blog-button-gradient);
    color: #ffffff;
    border: 2px solid transparent;
}
.page-blog__btn-secondary {
    background: transparent;
    color: var(--page-blog-gold-color);
    border: 2px solid var(--page-blog-gold-color);
}