/* =========================================
   1. HERO THƯƠNG HIỆU (Vát chéo)
   ========================================= */
.about-hero { 
  position: relative; 
  margin-top: 80px; 
  min-height: 520px; 
  display: flex;
  align-items: center;
  background-color: var(--color-primary); 
  overflow: hidden; 
}
.ah-bg { position: absolute; inset: 0; z-index: 1; }
.ah-img { width: 100%; height: 100%; object-fit: cover; object-position: right center; }

/* Polygon cắt chéo cho mảng xanh */
.ah-shape { 
  position: absolute; 
  inset: 0; 
  width: 65%; 
  background-color: var(--color-primary); 
  clip-path: polygon(0 0, 100% 0, 85% 100%, 0% 100%); 
  z-index: 2; 
}

.ah-inner { position: relative; z-index: 3; display: flex; width: 100%; padding: 60px 0; }
.ah-left { width: 60%; color: #FFF; padding-right: 40px; }
.ah-label { display: inline-block; font-size: 13px; font-weight: 700; opacity: 0.8; margin-bottom: 12px; }
.ah-title { font-size: clamp(32px, 3.5vw, 48px); font-weight: 800; line-height: 1.25; margin-bottom: 20px; }
.ah-desc { font-size: 16px; line-height: 1.6; opacity: 0.9; margin-bottom: 40px; max-width: 90%; }

.ah-features { display: flex; gap: 32px; border-top: 1px solid rgba(255,255,255,0.2); padding-top: 24px; }
.ah-feat { display: flex; align-items: flex-start; gap: 12px; font-size: 13px; font-weight: 600; opacity: 0.9; line-height: 1.4; }
.ah-feat .icon { width: 28px; height: 28px; }

/* Tranh trí góc phải */
.ah-right { width: 40%; display: flex; flex-direction: column; justify-content: center; align-items: flex-end; gap: 24px; }
.ah-box-top, .ah-box-bottom { background: rgba(255,255,255,0.85); backdrop-filter: blur(5px); padding: 24px; border-radius: 4px; color: var(--color-primary); text-align: left; }
.ah-box-top { width: 220px; margin-right: 40px; }
.ah-box-top img { width: 80px; margin-bottom: 12px; }
.ah-box-top strong { display: block; font-size: 16px; line-height: 1.3; }
.ah-box-bottom { background: rgba(17,27,87,0.85); color: #FFF; width: 220px; border-left: 4px solid #ED1C24; }
.ah-box-bottom span { font-size: 14px; font-weight: 700; line-height: 1.5; opacity: 0.9; }

/* =========================================
   2. HÀNH TRÌNH PHÁT TRIỂN (Timeline)
   ========================================= */
.timeline-wrapper { margin-top: 40px; }
.timeline-list { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; list-style: none; padding: 0; margin: 0; }
.timeline-item { position: relative; border-top: 2px solid #E5E5E5; padding-top: 32px; }
.timeline-item::before {
  content: ''; position: absolute; top: -6px; left: 0;
  width: 10px; height: 10px; background: var(--color-primary); border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(17,27,87,0.1);
}
.tl-year { font-family: var(--font-primary); font-size: 24px; font-weight: 800; color: var(--color-primary); margin-bottom: 12px; }
.tl-title { font-size: 16px; font-weight: 700; color: #333; margin-bottom: 8px; }
.tl-desc { font-size: 14px; color: #666; line-height: 1.5; }

/* =========================================
   3. SỨ MỆNH - TẦM NHÌN - GIÁ TRỊ (Grid)
   ========================================= */
.mvv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.mvv-card { display: flex; flex-direction: column; }
.mvv-header { display: flex; align-items: center; gap: 16px; margin-bottom: 16px; }
.mvv-icon { width: 48px; height: 48px; display: flex; align-items: center; justify-content: center; color: var(--color-primary); }
.mvv-icon .icon { width: 40px; height: 40px; }
.mvv-title { font-size: 20px; font-weight: 800; color: var(--color-primary); margin: 0; }
.mvv-desc { font-size: 15px; color: #555; line-height: 1.6; }
.mvv-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 12px; }
.mvv-list li { display: flex; align-items: center; gap: 12px; font-size: 15px; color: #555; font-weight: 500; }
.mvv-list li .icon { color: var(--color-primary); width: 18px; height: 18px; }

/* =========================================
   4. THỐNG KÊ (Blue Banner)
   ========================================= */
.stats-banner { background: var(--color-primary); color: #FFF; padding: 60px 0; }
.stats-inner { display: flex; justify-content: space-between; align-items: center; gap: 60px; }
.stats-left { width: 35%; border-left: 4px solid #ED1C24; padding-left: 20px; }
.stats-left h2 { font-size: 24px; font-weight: 800; margin-bottom: 12px; line-height: 1.3; }
.stats-left p { font-size: 14px; opacity: 0.8; line-height: 1.5; }
.stats-right { width: 65%; display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat-item { display: flex; flex-direction: column; align-items: center; position: relative; }
.stat-item:not(:last-child)::after { content: ''; position: absolute; right: -12px; top: 10%; height: 80%; width: 1px; background: rgba(255,255,255,0.2); }
.stat-item .icon { width: 40px; height: 40px; margin-bottom: 16px; opacity: 0.9; }
.stat-item strong { font-size: 28px; font-weight: 800; margin-bottom: 4px; }
.stat-item span { font-size: 13px; opacity: 0.8; }

/* =========================================
   5. SPLIT SECTIONS (R&D, Sản xuất)
   ========================================= */
.split-sec { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.split-sec--reverse .split-content { order: 2; }
.split-sec--reverse .split-img { order: 1; }
.subtitle-dark { font-size: 20px; font-weight: 700; color: #333; }
.split-content .desc { font-size: 15px; color: #555; line-height: 1.6; }
.split-content a {color: red;}
.split-img { border-radius: 12px; overflow: hidden; box-shadow: 0 10px 30px rgba(0,0,0,0.05); }
.split-img img { width: 100%; height: auto; display: block; }
.check-list { list-style: none; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.check-list li { display: flex; align-items: center; gap: 12px; font-size: 15px; color: #333; font-weight: 600; }
.check-list li .icon { color: var(--color-primary); background: #E8F0FE; border-radius: 50%; padding: 4px; width: 24px; height: 24px; }
/* =========================================
   7. CHỨNG NHẬN & CHỨNG CHỈ
   ========================================= */
.cert-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; text-align: center; }
.cert-card { background: #FFF; padding: 24px 16px; border: 1px solid var(--color-border); border-radius: 8px; transition: 0.3s; }
.cert-card:hover { border-color: var(--color-primary); box-shadow: 0 10px 20px rgba(0,0,0,0.05); transform: translateY(-4px); }
.cert-img-wrap { aspect-ratio: 3/4; background: #F8F9FA; border-radius: 4px; margin-bottom: 20px; overflow: hidden; display: flex; align-items: center; justify-content: center; padding: 12px; }
.cert-img { max-width: 100%; max-height: 100%; object-fit: contain; }
.cert-title { display: block; font-size: 15px; font-weight: 700; color: var(--color-primary); margin-bottom: 8px; }
.cert-desc { display: block; font-size: 13px; color: #666; line-height: 1.4; }

/* =========================================
   8. VÌ MỘT TƯƠNG LAI BỀN VỮNG
   ========================================= */
.sustain-wrapper { display: grid; grid-template-columns: 1fr 2fr; gap: 60px; align-items: center; }
.sustain-content .desc { font-size: 15px; color: #555; line-height: 1.6; }
.sustain-content a {color: red;}
.sustain-features { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.sus-item { display: flex; flex-direction: column; align-items: center; }
.sus-icon { color: #34A853; margin-bottom: 16px; }
.sus-icon .icon { width: 48px; height: 48px; stroke-width: 1; }
.sus-item strong { font-size: 15px; font-weight: 700; color: var(--color-primary); margin-bottom: 8px; line-height: 1.3; display: block; }
.sus-item p { font-size: 13px; color: #666; line-height: 1.5; margin: 0; }

/* =========================================
   9. HIỆN DIỆN TOÀN QUỐC
   ========================================= */
.dist-section { padding: 60px 0; overflow: hidden; }
.dist-grid { display: grid; grid-template-columns: 1fr 1fr 1.2fr; gap: 40px; align-items: center; }
.dist-content .desc { font-size: 15px; color: #555; }
.dist-stats { display: flex; gap: 32px; flex-wrap: wrap; }
.ds-item { display: flex; flex-direction: column; }
.ds-item strong { font-size: 32px; font-weight: 800; color: var(--color-primary); line-height: 1.1; margin-bottom: 4px; }
.ds-item span { font-size: 13px; color: #666; }

.map-legend { text-align: left; display: inline-block; background: #F8F9FA; padding: 12px 20px; border-radius: 8px; border: 1px solid var(--color-border); }
.map-legend small { display: block; font-weight: 700; color: var(--color-primary); margin-bottom: 8px; font-size: 12px; }
.map-legend ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 6px; }
.map-legend li { display: flex; align-items: center; gap: 8px; font-size: 12px; color: #555; }
.map-legend .dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }
.map-legend .dot.red { background: #ED1C24; }
.map-legend .dot.blue { background: #3B82F6; }
.map-legend .dot.dark { background: var(--color-primary); }

.dist-image { position: relative; border-radius: 12px; overflow: hidden; box-shadow: 0 10px 30px rgba(0,0,0,0.1); aspect-ratio: 4/3; }
.dist-image img { width: 100%; height: 100%; object-fit: cover; }
.dist-quote { position: absolute; top: 0; left: 0; width: 100%; padding: 32px; background: linear-gradient(to bottom, rgba(17,27,87,0.9) 0%, rgba(17,27,87,0) 100%); }
.dist-quote blockquote { font-family: 'Playfair Display', serif; font-size: 24px; font-style: italic; color: #FFF; margin: 0; font-weight: 600; line-height: 1.4; }

/* =========================================
   10. TUYÊN NGÔN (BOTTOM CTA)
   ========================================= */
.about-manifesto { position: relative; padding: 80px 0; background: var(--color-primary); overflow: hidden; }
.am-bg { position: absolute; inset: 0; z-index: 1; opacity: 0.1; }
.am-bg img { width: 100%; height: 100%; object-fit: cover; }
.am-inner { position: relative; z-index: 2; display: flex; justify-content: space-between; align-items: center; gap: 60px; color: #FFF; }
.am-left { width: 60%; }
.am-label { display: inline-block; font-size: 13px; font-weight: 700; opacity: 0.8; margin-bottom: 12px; letter-spacing: 1px; }
.am-title { font-size: clamp(28px, 3vw, 40px); font-weight: 800; line-height: 1.3; margin-bottom: 20px; }
.am-desc { font-size: 16px; opacity: 0.85; line-height: 1.6; max-width: 90%; }
.am-right { width: 40%; text-align: right; }
.am-slogan { font-size: clamp(32px, 4vw, 56px); font-weight: 800; opacity: 0.15; line-height: 1.1; letter-spacing: 2px; }

/* =========================================
   RESPONSIVE BỔ SUNG
   ========================================= */
@media (max-width: 1199px) {
  .cert-grid { grid-template-columns: repeat(3, 1fr); }
  .sustain-wrapper { grid-template-columns: 1fr; gap: 40px; }
  .sustain-content { text-align: center; }
  .sustain-content .desc { max-width: 700px; margin-left: auto; margin-right: auto; }
  .dist-grid { grid-template-columns: 1fr 1fr; gap: 40px; }
  .dist-content { grid-column: span 2; text-align: center; }
  .dist-stats { justify-content: center; }
}

/* =========================================
   RESPONSIVE
   ========================================= */

@media (max-width: 991px) {
  .ah-shape { width: 100%; clip-path: none; background: linear-gradient(to right, rgba(17,27,87,1) 30%, rgba(17,27,87,0.7) 100%); }
  .ah-left { width: 100%; padding-right: 0; }
  
  .timeline-list { grid-template-columns: 1fr; gap: 32px; }
  .timeline-item { border-top: none; border-left: 2px solid #E5E5E5; padding-top: 0; padding-left: 32px; }
  .timeline-item::before { top: 0; left: -6px; }
  
  .mvv-grid { grid-template-columns: 1fr; gap: 32px; }
  .split-sec { grid-template-columns: 1fr; gap: 40px; }
  .split-sec--reverse .split-content { order: 1; }
  .split-sec--reverse .split-img { order: 2; }
  .ah-shape { width: 75%; }
  .ah-left { width: 70%; }
  .ah-right { display: none; }
  .stats-inner { flex-direction: column; text-align: center; }
  .stats-left { width: 100%; border-left: none; border-top: 4px solid #ED1C24; padding: 20px 0 0 0; }
  .stats-right { width: 100%; }
}

@media (max-width: 767px) {
  .ah-features { flex-direction: column; gap: 16px; }
  .stats-right { grid-template-columns: repeat(2, 1fr); gap: 32px 16px; }
  .stat-item:not(:last-child)::after { display: none; }
  .check-list { grid-template-columns: 1fr; }
  
  .cert-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .sustain-features { grid-template-columns: repeat(2, 1fr); gap: 24px 16px; }
  .dist-grid { grid-template-columns: 1fr; gap: 32px; }
  .dist-content { grid-column: span 1; }
  .am-inner { flex-direction: column; text-align: center; gap: 40px; }
  .am-left, .am-right { width: 100%; text-align: center; }
  .am-desc { max-width: 100%; }
  .am-slogan { font-size: 40px; }
}