/* ===================================================================
   LONGFORM E-MAGAZINE DATA JOURNALISM STYLESHEET
   Thiết kế báo chí dữ liệu hiện đại - Chuyên đề Cây Chè Thái Nguyên
   =================================================================== */

:root {
  /* Hệ thống màu sắc tự nhiên vùng chè */
  --color-tea-deep: #0e291c;
  --color-tea-forest: #163f2c;
  --color-tea-primary: #1c573c;
  --color-tea-accent: #2e8b57;
  --color-tea-light: #eaf3ed;
  --color-tea-pale: #f2f7f4;
  
  --color-harvest-gold: #c69234;
  --color-gold-light: #fef8ec;
  --color-gold-border: #edd5a6;

  --color-bg-paper: #faf8f5;
  --color-card-bg: #ffffff;
  --color-text-main: #18231c;
  --color-text-muted: #4e5f55;
  --color-border: #e2ebe5;
  --color-border-dark: #cbdcd1;

  /* Typography scale - Báo chí dữ liệu chất lượng cao */
  --font-serif: 'Lora', 'Merriweather', Georgia, serif;
  --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-display: 'Cinzel', 'Playfair Display', Georgia, serif;

  /* Cỡ chữ toàn trang tối thiểu 16px - Body 19px tạo trải nghiệm đọc hoàn hảo */
  --fs-body: 19px;
  --fs-quote: 22px;
  --fs-infographic: 18px; /* Tối thiểu 18px cho infographic theo yêu cầu */
  
  --line-height-body: 1.85;
  --max-content-width: 780px;
  --max-wide-width: 1140px;
  --max-full-width: 1360px;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  
  --shadow-subtle: 0 4px 20px rgba(14, 41, 28, 0.06);
  --shadow-elevated: 0 12px 36px rgba(14, 41, 28, 0.1);
  --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.05);

  --transition-smooth: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Reset cơ bản */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--color-bg-paper);
  color: var(--color-text-main);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--line-height-body);
  background-color: var(--color-bg-paper);
  color: var(--color-text-main);
  overflow-x: hidden;
  padding-bottom: 60px;
}

/* -------------------------------------------------------------------
   THANH TIẾN TRÌNH ĐỌC (READING PROGRESS BAR)
   ------------------------------------------------------------------- */
.reading-progress-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: rgba(22, 63, 44, 0.1);
  z-index: 1000;
}

.reading-progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-tea-accent), var(--color-harvest-gold));
  transition: width 0.1s ease-out;
}

/* -------------------------------------------------------------------
   THANH ĐIỀU HƯỚNG TỐI GIẢN (MINIMAL READING HEADER)
   Không dùng menu phức tạp, tập trung trải nghiệm đọc
   ------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 900;
  background: rgba(250, 248, 245, 0.94);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(28, 87, 60, 0.12);
  padding: 12px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand-badge {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-tea-forest);
}

.brand-badge svg {
  width: 20px;
  height: 20px;
  fill: var(--color-tea-accent);
}

.reading-meta-tag {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.5px;
}

/* -------------------------------------------------------------------
   HERO / COVER SECTION BÁO CHÍ
   ------------------------------------------------------------------- */
.article-hero {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: flex-end;
  padding: 80px 24px 70px;
  background-color: var(--color-tea-deep);
  color: #ffffff;
  overflow: hidden;
}

.hero-background-wrapper {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 115%;
  z-index: 1;
  transform: translateY(0);
  will-change: transform;
}

.hero-bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 35%;
  filter: brightness(0.68) saturate(1.15);
}

.hero-gradient-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    180deg,
    rgba(14, 41, 28, 0.3) 0%,
    rgba(14, 41, 28, 0.6) 45%,
    rgba(14, 41, 28, 0.94) 100%
  );
  z-index: 2;
}

.hero-content-inner {
  position: relative;
  z-index: 3;
  max-width: 1080px;
  margin: 0 auto;
  width: 100%;
}

.hero-category-label {
  display: inline-block;
  padding: 6px 14px;
  background: rgba(198, 146, 52, 0.25);
  border: 1px solid rgba(198, 146, 52, 0.6);
  border-radius: 30px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: #ffd88a;
  margin-bottom: 22px;
}

.main-headline {
  font-family: var(--font-serif);
  font-size: clamp(2.3rem, 5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.5px;
  color: #ffffff;
  margin-bottom: 20px;
  text-shadow: 0 4px 18px rgba(0, 0, 0, 0.45);
}

.main-subheadline {
  font-family: var(--font-sans);
  font-size: clamp(1.2rem, 2.2vw, 1.6rem);
  font-weight: 400;
  line-height: 1.5;
  color: #e5ede8;
  max-width: 860px;
  margin-bottom: 35px;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

.hero-meta-byline {
  display: flex;
  align-items: center;
  gap: 20px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.22);
  font-size: 15px;
  color: #d1ded6;
}

.byline-author {
  font-weight: 700;
  color: #ffffff;
}

.byline-dot {
  opacity: 0.5;
}

/* -------------------------------------------------------------------
   CONTAINER BỐ CỤC NỘI DUNG CHÍNH
   ------------------------------------------------------------------- */
.article-wrapper {
  width: 100%;
}

.reading-column {
  max-width: var(--max-content-width);
  margin: 0 auto;
  padding: 0 24px;
}

.wide-column {
  max-width: var(--max-wide-width);
  margin: 0 auto;
  padding: 0 24px;
}

.full-column {
  max-width: var(--max-full-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* -------------------------------------------------------------------
   PHẦN MỞ ĐẦU / SA-PÔ (LEAD IN PARAGRAPHS)
   ------------------------------------------------------------------- */
.article-lead-section {
  padding: 60px 0 30px;
}

.lead-paragraph {
  font-family: var(--font-serif);
  font-size: 21px;
  line-height: 1.85;
  color: #1e3328;
  margin-bottom: 24px;
}

.drop-cap::first-letter {
  float: left;
  font-family: var(--font-display);
  font-size: 4.8rem;
  line-height: 0.8;
  padding-top: 4px;
  padding-right: 14px;
  padding-bottom: 4px;
  color: var(--color-tea-forest);
  font-weight: 700;
}

/* -------------------------------------------------------------------
   CÁC PHẦN BÀI VIẾT (PARTS I, II, III)
   ------------------------------------------------------------------- */
.content-part {
  position: relative;
  padding: 50px 0 20px;
  border-top: 1px solid var(--color-border);
  margin-top: 40px;
}

.part-indicator {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-harvest-gold);
  margin-bottom: 12px;
}

.part-indicator::before {
  content: "";
  display: inline-block;
  width: 24px;
  height: 2px;
  background-color: var(--color-harvest-gold);
}

.part-title {
  font-family: var(--font-serif);
  font-size: clamp(1.9rem, 3.5vw, 2.45rem);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-tea-forest);
  margin-bottom: 32px;
  letter-spacing: -0.3px;
}

/* Paragraphs & Typography */
p.article-body-p {
  margin-bottom: 24px;
  text-align: justify;
  text-justify: inter-word;
  color: var(--color-text-main);
  font-size: var(--fs-body);
}

/* Trích dẫn báo chí (Editorial Quotes / Pull Quotes) */
.editorial-quote-card {
  margin: 40px auto;
  max-width: 820px;
  background: var(--color-tea-pale);
  border-left: 5px solid var(--color-tea-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 30px 34px;
  position: relative;
  box-shadow: var(--shadow-subtle);
}

.editorial-quote-card::before {
  content: "“";
  position: absolute;
  top: 10px;
  left: 14px;
  font-family: var(--font-serif);
  font-size: 4rem;
  color: rgba(28, 87, 60, 0.15);
  line-height: 1;
}

.editorial-quote-text {
  font-family: var(--font-serif);
  font-size: 21px;
  font-style: italic;
  line-height: 1.7;
  color: var(--color-tea-deep);
  margin-bottom: 14px;
}

.editorial-quote-author {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--color-harvest-gold);
}

/* -------------------------------------------------------------------
   ẢNH MINH HỌA BÁO CHÍ (EDITORIAL PHOTO HERO / PARALLAX)
   Ảnh đơn giản, không text, 1-3 nhân vật
   ------------------------------------------------------------------- */
.editorial-photo-section {
  margin: 48px 0;
  position: relative;
}

.photo-frame {
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-elevated);
  background-color: #0e291c;
  position: relative;
}

.photo-frame img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.photo-frame:hover img {
  transform: scale(1.02);
}

.photo-caption {
  font-size: 14px;
  color: var(--color-text-muted);
  font-style: italic;
  margin-top: 10px;
  text-align: center;
}

/* -------------------------------------------------------------------
   INFOGRAPHIC CHUẨN BÁO CHÍ DỮ LIỆU (DATA JOURNALISM VISUALS)
   - Cỡ chữ tối thiểu 18px
   - Thuần dữ liệu, SVG, icon, biểu đồ, con số, ít chữ
   - Chỉ dùng đúng dữ liệu có trong bài báo gốc
   ------------------------------------------------------------------- */
.infographic-container {
  margin: 50px auto;
  padding: 38px 32px;
  background: #ffffff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.infographic-container::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: linear-gradient(90deg, var(--color-tea-primary), var(--color-harvest-gold));
}

.infographic-header {
  margin-bottom: 30px;
  text-align: center;
}

.infographic-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 18px; /* Tối thiểu 18px */
  font-weight: 800;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-harvest-gold);
  margin-bottom: 8px;
}

.infographic-title {
  font-family: var(--font-serif);
  font-size: clamp(22px, 2.5vw, 28px);
  color: var(--color-tea-forest);
  font-weight: 700;
  line-height: 1.35;
}

/* KPI Counter Metric Cards */
.metrics-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 32px;
}

.metrics-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 32px;
}

.metric-card {
  background: var(--color-tea-pale);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 18px;
  text-align: center;
  transition: var(--transition-smooth);
}

.metric-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-subtle);
  border-color: var(--color-tea-accent);
}

.metric-number-wrapper {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
  margin-bottom: 8px;
}

.metric-number {
  font-family: var(--font-serif);
  font-size: 44px;
  font-weight: 800;
  color: var(--color-tea-primary);
  line-height: 1;
}

.metric-unit {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-harvest-gold);
}

.metric-label {
  font-size: 18px; /* Đảm bảo tối thiểu 18px */
  font-weight: 600;
  color: var(--color-text-main);
  line-height: 1.4;
}

/* Biểu đồ SVG Tương tác & Trực quan */
.infographic-interactive-board {
  background: #fbfdfc;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 26px 20px;
}

/* Bảng so sánh 2 mô hình (Infographic 1) */
.comparison-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.comparison-box {
  border-radius: var(--radius-md);
  padding: 24px;
}

.comparison-box.old-way {
  background: #fff5f5;
  border: 1px dashed #e69898;
}

.comparison-box.new-way {
  background: #f0f8f4;
  border: 1px solid #7bc59f;
}

.comparison-box-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px; /* >= 18px */
  font-weight: 800;
  margin-bottom: 18px;
}

.old-way .comparison-box-title {
  color: #a33232;
}

.new-way .comparison-box-title {
  color: #17633d;
}

.comparison-step-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.comparison-step-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 18px; /* >= 18px */
  font-weight: 600;
  color: var(--color-text-main);
}

.step-icon {
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  flex-shrink: 0;
}

.old-way .step-icon {
  background: #fcd7d7;
  color: #b82d2d;
}

.new-way .step-icon {
  background: #c8ebd8;
  color: #10663c;
}

/* Infographic 2: Biểu đồ SVG Diện tích & Danh mục 6 dòng trà */
.info2-layout {
  display: grid;
  grid-template-columns: 1.1fr 1.3fr;
  gap: 30px;
  align-items: center;
}

.area-donut-chart-wrapper {
  text-align: center;
}

.area-legend-list {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.area-legend-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 18px; /* >= 18px */
  font-weight: 600;
}

.legend-color-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  display: inline-block;
  margin-right: 8px;
}

/* 6 Dòng trà chủ lực & Giá trị */
.tea-products-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

.tea-product-pill {
  background: #ffffff;
  border: 1px solid var(--color-border);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px; /* >= 18px */
  font-weight: 700;
  color: var(--color-tea-forest);
  box-shadow: 0 2px 8px rgba(0,0,0,0.03);
}

.tea-product-pill svg {
  width: 22px;
  height: 22px;
  fill: var(--color-tea-accent);
}

.price-bar-wrapper {
  background: #f7faf8;
  padding: 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.price-title-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 18px; /* >= 18px */
  font-weight: 700;
  color: var(--color-tea-forest);
  margin-bottom: 12px;
}

.price-visual-track {
  height: 14px;
  background: #e2ede6;
  border-radius: 10px;
  position: relative;
  overflow: hidden;
}

.price-visual-fill {
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, #3aa372, #c69234);
}

.price-tags-row {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
  font-size: 18px; /* >= 18px */
  font-weight: 800;
  color: var(--color-tea-primary);
}

/* Cột mốc quốc tế huy chương vàng/đồng Golden Leaf */
.award-banner {
  margin-top: 24px;
  background: linear-gradient(135deg, #fdf8ec 0%, #faefd6 100%);
  border: 1px solid #e8cb8d;
  border-radius: var(--radius-md);
  padding: 18px 22px;
  display: flex;
  align-items: center;
  gap: 18px;
}

.award-medal-icon {
  width: 52px;
  height: 52px;
  flex-shrink: 0;
  background: #c69234;
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(198, 146, 52, 0.4);
}

.award-details {
  font-size: 18px; /* >= 18px */
  color: #634306;
  font-weight: 600;
  line-height: 1.45;
}

.award-details strong {
  color: #3b2700;
  font-weight: 800;
}

/* Infographic 3: Canh tác hữu cơ & Giá trị Farmstay */
.info3-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.info3-column {
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 22px;
}

.info3-col-header {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px; /* >= 18px */
  font-weight: 800;
  color: var(--color-tea-forest);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-tea-light);
}

.info3-timeline-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.timeline-data-point {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.timeline-year-badge {
  background: var(--color-tea-forest);
  color: #ffffff;
  font-size: 18px; /* >= 18px */
  font-weight: 800;
  padding: 6px 12px;
  border-radius: 6px;
  flex-shrink: 0;
}

.timeline-text {
  font-size: 18px; /* >= 18px */
  font-weight: 600;
  color: var(--color-text-main);
  line-height: 1.45;
}

/* Tăng giá trị Farmstay trực quan */
.farmstay-growth-card {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 20px 10px;
}

.growth-badge-large {
  font-family: var(--font-serif);
  font-size: 46px;
  font-weight: 800;
  color: var(--color-harvest-gold);
  line-height: 1;
  margin: 14px 0 10px;
}

.growth-caption {
  font-size: 19px; /* >= 18px */
  font-weight: 700;
  color: var(--color-tea-forest);
  max-width: 320px;
  line-height: 1.4;
}

.farmstay-experience-icons {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 24px;
}

.exp-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 18px; /* >= 18px */
  font-weight: 700;
  color: var(--color-text-muted);
}

.exp-item-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-tea-pale);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-tea-accent);
}

/* -------------------------------------------------------------------
   PHẦN KẾT VÀ TÁC GIẢ (CONCLUSION & BYLINE)
   ------------------------------------------------------------------- */
.article-conclusion-section {
  margin-top: 50px;
  padding-top: 40px;
  border-top: 2px solid var(--color-border);
}

.author-signoff-card {
  margin: 40px auto 20px;
  max-width: var(--max-content-width);
  padding: 24px 30px;
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--shadow-subtle);
}

.author-info {
  display: flex;
  align-items: center;
  gap: 16px;
}

.author-avatar-initial {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--color-tea-forest);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 700;
}

.author-name {
  font-size: 20px;
  font-weight: 800;
  color: var(--color-tea-forest);
}

.author-role {
  font-size: 15px;
  color: var(--color-text-muted);
}

.back-to-top-btn {
  background: var(--color-tea-light);
  border: none;
  color: var(--color-tea-forest);
  padding: 10px 18px;
  border-radius: 30px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition-smooth);
}

.back-to-top-btn:hover {
  background: var(--color-tea-forest);
  color: #ffffff;
}

/* Footer tối giản */
.site-footer {
  text-align: center;
  margin-top: 60px;
  padding: 24px;
  font-size: 14px;
  color: var(--color-text-muted);
}

/* -------------------------------------------------------------------
   ANIMATIONS & SCROLL-TRIGGER UTILITIES
   ------------------------------------------------------------------- */
.reveal-fade-in {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.reveal-fade-in.is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* SVG stroke drawing animation */
.draw-svg-path {
  stroke-dasharray: 1000;
  stroke-dashoffset: 1000;
  transition: stroke-dashoffset 1.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.is-revealed .draw-svg-path {
  stroke-dashoffset: 0;
}

/* -------------------------------------------------------------------
   RESPONSIVE DESIGN (DESKTOP, TABLET, MOBILE)
   ------------------------------------------------------------------- */
@media (max-width: 1024px) {
  :root {
    --fs-body: 18px;
    --fs-infographic: 18px; /* Luôn giữ tối thiểu 18px theo yêu cầu */
  }

  .metrics-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .info2-layout {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .info3-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --fs-body: 17px;
    --fs-quote: 19px;
    --fs-infographic: 18px; /* Không hạ dưới 18px */
  }

  .article-hero {
    min-height: 75vh;
    padding: 60px 16px 40px;
  }

  .reading-column, .wide-column, .full-column {
    padding: 0 16px;
  }

  .infographic-container {
    padding: 24px 16px;
    margin: 36px 0;
  }

  .metrics-grid-4 {
    grid-template-columns: 1fr;
  }

  .metrics-grid-3 {
    grid-template-columns: 1fr;
  }

  .comparison-container {
    grid-template-columns: 1fr;
  }

  .tea-products-grid {
    grid-template-columns: 1fr;
  }

  .editorial-quote-card {
    padding: 20px 20px;
  }

  .author-signoff-card {
    flex-direction: column;
    gap: 20px;
    text-align: center;
  }

  .author-info {
    flex-direction: column;
  }
}