/* =========================================
   HERO BÀI VIẾT (CHUẨN THIẾT KẾ)
   ========================================= */
.ad-hero { 
  position: relative; 
  margin-top: 80px; /* Nhường chỗ cho sticky header */
  min-height: 480px; /* Đảm bảo độ cao để thấy được không gian ảnh */
  display: flex;
  align-items: center;
  background-color: var(--color-primary); 
  overflow: hidden; 
}

.ad-hero__bg { 
  position: absolute; 
  inset: 0; 
  z-index: 1; 
}
.ad-hero__img { 
  width: 100%; 
  height: 100%; 
  object-fit: cover; 
  object-position: center right; /* Ép trọng tâm ảnh sang phải để ko bị che */
}

/* Lớp gradient xanh Navy phủ từ trái sang phải (Đậm ở trái, mờ dần sang phải) */
.ad-hero__overlay { 
  position: absolute; 
  inset: 0; 
  z-index: 2; 
  background: linear-gradient(to right, rgba(17,27,87,1) 0%, rgba(17,27,87,0.95) 45%, rgba(17,27,87,0) 80%); 
}

.ad-hero__inner { 
  position: relative; 
  z-index: 3; 
  color: #FFF; 
  padding: 60px 0;
}

/* Breadcrumb */
.ad-breadcrumb { 
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px; 
  list-style: none; padding: 0; margin: 0 0 32px 0;
  font-size: 13px; opacity: 0.8; 
}
.ad-breadcrumb a { color: #FFF; text-decoration: none; transition: 0.2s; }
.ad-breadcrumb a:hover { opacity: 1; text-decoration: underline; }
.ad-breadcrumb .icon { width: 12px; height: 12px; }

/* Category */
.ad-hero__cat { 
  font-size: 13px; font-weight: 700; text-transform: uppercase; 
  letter-spacing: 1px; margin-bottom: 12px; ; padding-top: 40px;
  /* Đã bỏ background và border theo đúng thiết kế gốc */
}

/* Tiêu đề & Sapo - Giới hạn độ rộng để không tràn sang vùng sáng của ảnh */
.ad-hero__title { 
  font-size: clamp(28px, 3.5vw, 44px); font-weight: 800; 
  line-height: 1.3; margin-bottom: 16px; 
  max-width: 750px; 
}

.ad-hero__sapo { 
  font-size: 16px; line-height: 1.6; opacity: 0.9; margin-bottom: 40px; 
  font-weight: 400; 
  max-width: 650px; 
}

/* Meta Data (Ngày đăng, thời gian, lượt xem) */
.ad-hero__meta { 
  display: flex; align-items: center; flex-wrap: wrap; gap: 32px; 
  font-size: 14px; opacity: 0.9; 
}
.ad-hero__meta span { display: flex; align-items: center; gap: 8px; }
.ad-hero__meta .icon { width: 18px; height: 18px; }

/* Responsive cho Mobile/Tablet */
@media (max-width: 991px) {
  .ad-hero { min-height: auto; padding: 40px 0; }
  .ad-hero__overlay { background: linear-gradient(to right, rgba(17,27,87,1) 20%, rgba(17,27,87,0.8) 100%); }
  .ad-hero__title, .ad-hero__sapo { max-width: 100%; }
  .ad-hero__meta { gap: 16px 24px; }
}

/* =========================================
   BỐ CỤC CHUNG (LAYOUT)
   ========================================= */
.ad-layout { display: grid; grid-template-columns: 280px 1fr; gap: 60px; align-items: start; }

/* =========================================
   SIDEBAR & MỤC LỤC
   ========================================= */
.ad-sidebar__sticky { position: sticky; top: 120px; display: flex; flex-direction: column; gap: 32px; }
.ad-toc { background: #F8F9FA; padding: 32px 24px; border-radius: 12px; border: 1px solid var(--color-border); }
.ad-toc h3 { font-size: 16px; font-weight: 700; margin-bottom: 20px; color: var(--color-primary); }
.ad-toc ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 12px; }
.ad-toc a { display: flex; gap: 12px; font-size: 14px; color: #555; text-decoration: none; line-height: 1.5; transition: 0.2s; font-weight: 500; }
.ad-toc a span { font-weight: 700; color: #999; }
.ad-toc a:hover, .ad-toc a.active { color: var(--color-primary); }
.ad-toc a.active span { color: var(--color-primary); }

.ad-promo-banner img { width: 100%; border-radius: 12px; transition: transform 0.3s; }
.ad-promo-banner:hover img { transform: translateY(-4px); box-shadow: 0 10px 20px rgba(0,0,0,0.1); }

/* =========================================
   CSS WORDPRESS CONTENT (NỘI DUNG)
   ========================================= */
.post-content { max-width: 100%; color: #333; font-size: 17px; line-height: 1.7; word-wrap: break-word; }

.post-content h2, .post-content h3, .post-content h4 { 
  color: var(--color-primary); 
  font-family: var(--font-primary); 
  font-weight: 700; 
  margin: 40px 0 20px; 
  line-height: 1.3; 
  scroll-margin-top: 100px; /* Cực kỳ quan trọng để header fixed không đè lên chữ khi click mục lục */
}
.post-content h2 { font-size: 26px; }
.post-content h3 { font-size: 20px; }
.post-content p { margin-bottom: 20px; }
.post-content a { color: #ED1C24; text-decoration: underline; }

/* Ảnh & Caption */
.post-content img { max-width: 100%; height: auto; border-radius: 8px; margin: 24px 0; display: block; }
.post-content figure { margin: 32px 0; }
.post-content figure img { margin: 0 0 12px 0; }
.post-content figcaption { text-align: center; font-size: 14px; color: #777; font-style: italic; border-left: 3px solid var(--color-primary); padding-left: 12px; display: inline-block; text-align: left;}

/* Trích dẫn (Blockquote) */
.post-content blockquote {
  position: relative; margin: 40px 0; padding: 24px 32px 24px 60px;
  background: #F8F9FA; border-left: 4px solid #ED1C24; border-radius: 0 8px 8px 0;
}
.post-content blockquote::before {
  content: "“"; position: absolute; left: 16px; top: 10px;
  font-family: 'Playfair Display', serif; font-size: 60px; color: var(--color-primary); opacity: 0.2; line-height: 1;
}
.post-content blockquote p { font-family: 'Playfair Display', serif; font-size: 22px; font-style: italic; color: var(--color-primary); margin-bottom: 12px; line-height: 1.5; }
.post-content blockquote cite { font-size: 14px; color: #666; font-style: normal; font-weight: 600; display: block; }

/* Danh sách */
.post-content ul, .post-content ol { margin-bottom: 24px; padding-left: 24px; }
.post-content li { margin-bottom: 12px; }

/* Table */
.post-content table { width: 100%; border-collapse: collapse; margin: 32px 0; font-size: 15px; }
.post-content table th, .post-content table td { border: 1px solid var(--color-border); padding: 12px 16px; text-align: left; }
.post-content table th { background: #F8F9FA; color: var(--color-primary); font-weight: 700; }

/* Custom Blocks (Dành cho Editor) */
.ad-tips-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin: 32px 0; }
.ad-tip { display: flex; gap: 16px; padding: 10px 20px; background: #F8F9FA; border-radius: 8px; border: 1px solid var(--color-border); }
.ad-tip-icon { width: 40px; height: 40px; border-radius: 50%; background: #FFF; display: flex; align-items: center; justify-content: center; color: var(--color-primary); box-shadow: 0 2px 8px rgba(0,0,0,0.05); flex-shrink: 0; }
.ad-tip-icon .icon { width: 20px; height: 20px; }
.ad-tip strong { display: block; font-size: 16px; margin-bottom: 4px; color: var(--color-primary); }
.ad-tip p { margin: 0 !important; font-size: 14px; color: #666; }

/* =========================================
   AUTHOR & SHARE
   ========================================= */
.ad-bottom-meta { margin-top: 60px; padding-top: 40px; border-top: 1px solid var(--color-border); }
.ad-tags { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-bottom: 40px; }
.ad-tags span { font-weight: 700; font-size: 14px; color: #333; }
.ad-tags a { padding: 6px 16px; background: #F1F3F5; color: #555; border-radius: 20px; font-size: 13px; text-decoration: none; transition: 0.2s; }
.ad-tags a:hover { background: var(--color-primary); color: #FFF; }

.ad-author-share { display: flex; justify-content: space-between; align-items: stretch; gap: 40px; background: #F8F9FA; padding: 32px; border-radius: 12px; }
.ad-author { display: flex; gap: 24px; flex: 1; }
.ad-author img { width: 80px; height: 80px; border-radius: 50%; object-fit: cover; flex-shrink: 0; }
.ad-author-info strong { display: block; font-size: 18px; color: var(--color-primary); margin-bottom: 4px; }
.ad-author-info span { display: block; font-size: 13px; color: #666; margin-bottom: 12px; }
.ad-author-info p { margin: 0 !important; font-size: 14px; color: #555; line-height: 1.5; }

.ad-share { width: 200px; display: flex; flex-direction: column; justify-content: center; gap: 12px; border-left: 1px solid #E5E5E5; padding-left: 40px; }
.ad-share span { font-size: 14px; font-weight: 700; color: var(--color-primary); }
.share-links { display: flex; gap: 12px; }
.share-links a, .share-links button { width: 36px; height: 36px; border-radius: 50%; display: flex; align-items: center; justify-content: center; border: none; cursor: pointer; transition: 0.2s; text-decoration: none; }
.share-links .icon { width: 16px; height: 16px; }
.sh-fb { background: #E8F0FE; color: #1877F2; } .sh-fb:hover { background: #1877F2; color: #FFF; }
.sh-in { background: #E1F0FE; color: #0077B5; } .sh-in:hover { background: #0077B5; color: #FFF; }
.sh-link { background: #F1F3F5; color: #333; } .sh-link:hover { background: #333; color: #FFF; }

/* TOAST COPY */
.toast-message { position: fixed; bottom: -60px; left: 50%; transform: translateX(-50%); background: rgba(0,0,0,0.8); color: #FFF; padding: 12px 24px; border-radius: 30px; font-size: 14px; font-weight: 600; z-index: 9999; transition: bottom 0.3s ease; }
.toast-message.show { bottom: 40px; }

/* =========================================
   RESPONSIVE
   ========================================= */
@media (max-width: 1199px) {
  .ad-layout { grid-template-columns: 240px 1fr; gap: 40px; }
  .ad-author-share { flex-direction: column; gap: 24px; }
  .ad-share { width: 100%; border-left: none; border-top: 1px solid #E5E5E5; padding-left: 0; padding-top: 24px; flex-direction: row; align-items: center; justify-content: space-between; }
}
@media (max-width: 991px) {
  .ad-layout { grid-template-columns: 1fr; }
  .ad-sidebar { display: none; } /* Giấu mục lục và banner trên Mobile để ko làm phiền đọc */
  .ad-hero { padding: 80px 0 60px; }
  .ad-hero__inner { max-width: 100%; }
}
@media (max-width: 767px) {
  .ad-hero__meta { flex-wrap: wrap; gap: 16px; }
  .ad-tips-grid { grid-template-columns: 1fr; }
  .ad-author { flex-direction: column; text-align: center; align-items: center; }
}

/* =========================================
   CÁC SECTION MỞ RỘNG (Ngoài Nội Dung Bài)
   ========================================= */
.ad-extra-sec {
  margin-top: 60px;
  padding-top: 40px;
}
.ad-extra-title {
  font-size: 20px;
  font-weight: 800;
  color: var(--color-primary);
  text-transform: uppercase;
  margin-bottom: 24px;
}

/* Khối 5 Gam Màu Nổi Bật (Dạng Card bo góc nền xám nhạt) */
.ad-colors-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; }
.ad-color-card { 
  background: #F8F9FA;
  overflow: hidden; /* Cắt góc viền màu bên trong */
  box-shadow: 0 4px 12px rgba(0,0,0,0.02);
}
.ad-color-card .color-box { width: 100%; aspect-ratio: 8/3; border-radius: 8px; }
.ad-color-card .color-info { padding: 16px 12px; }
.ad-color-card strong { display: block; font-size: 14px; font-weight: 700; color: var(--color-primary); margin-bottom: 4px; }
.ad-color-card span { display: block; font-size: 12px; color: #777; line-height: 1.4; }

/* Khối Mẹo Ứng Dụng */
.ad-tips-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; }
.ad-tip { display: flex; align-items: flex-start; gap: 16px; padding: 10px 20px; border-right: 1px solid #E5E5E5; }
.ad-tip:first-child { padding: 10px; }
.ad-tip:last-child { border-right: none; padding-right: 0; }
.ad-tip-icon { color: var(--color-primary); flex-shrink: 0; }
.ad-tip-icon .icon { width: 32px; height: 32px; stroke-width: 1.5; }
.ad-tip-content strong { display: block; font-size: 14px; font-weight: 700; color: var(--color-primary); margin-bottom: 8px; line-height: 1.4; }
.ad-tip-content p { margin: 0; font-size: 13px; color: #666; line-height: 1.5; }

/* Responsive */
@media (max-width: 991px) {
  .ad-colors-grid { grid-template-columns: repeat(3, 1fr); gap: 20px 16px; }
  .ad-tips-grid { grid-template-columns: repeat(2, 1fr); gap: 32px 0; }
  .ad-tip { padding: 0 12px; gap: 12px; }
  .ad-tip:nth-child(2) { border-right: none; padding-right: 0; }
  .ad-tip:nth-child(3) { padding-left: 0; }
}
@media (max-width: 767px) {
  .ad-colors-grid { grid-template-columns: repeat(2, 1fr); }
  .ad-tips-grid { grid-template-columns: 1fr; gap: 24px 0; }
  .ad-tip { border-right: none; padding: 0 !important; }
}