/* 1. HERO BANNER */
.about-page .hero-banner {
  position: relative;
  height: 50vh;
  min-height: 500px;
  background-position:center center;
  background-size: cover;
  background-attachment:fixed;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  text-align: center;
}

.about-page .hero-overlay {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(4, 37, 136, 0.45);
}

.about-page .hero-content {
  position: relative;
  z-index: 5;
}

.about-page .hero-content h1 {
  font-size: 2.8rem;
  font-weight: 700;
  letter-spacing: 1px;
}

/* 2. TAB MENU (ACTIVE = #042588, MẶC ĐỊNH = ĐEN) */
.about-tab-nav {
  position: sticky;
  top: 85px; /* Điều chỉnh phù hợp với chiều cao Header cố định của bạn */
  z-index: 900;
  background: #fff;
  box-shadow: 0 4px 10px rgba(0,0,0,0.08);
}

.tab-container {
  display: flex;
  justify-content: center;
  overflow-x: auto;
}

.tab-item {
  padding: 16px 24px;
  color: #000; /* Mặc định chữ màu đen */
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  white-space: nowrap;
  border-bottom: 3px solid transparent;
  transition: all 0.3s ease;
}

.tab-item:hover,
.tab-item.active {
  color: #042588; /* Màu xanh khi hover hoặc active */
  border-bottom-color: #042588;
}

/* 3. VỀ GLOBAL LINK */
.intro-text { font-size: 1.15rem; color: #444; margin-bottom: 15px; }
.sub-text { color: #666; }

/* 4. THƯ NGỎ (FULL WIDTH & SCROLLBAR) */
.sec-thu-ngo { width: 100%; background: #0A2540; color: #fff; }
.thu-ngo-wrapper { display: flex; width: 100%; max-height: 550px; }
.thu-ngo-col { flex: 1; }

.thu-ngo-col.img-col img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.thu-ngo-col.content-col {
  padding: 50px;
  display: flex;
  align-items: center;
}

.scroll-content {
  
}

.scroll-content::-webkit-scrollbar { width: 5px; }
.scroll-content::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.3); border-radius: 3px; }

.sub-heading { color: #ffc107; font-weight: bold; letter-spacing: 1px; font-size: 0.85rem; }
.content-col h2 { font-size: 1.8rem; margin: 10px 0 20px; }
.content-col p { margin-bottom: 15px; color: #e0e0e0; font-size: 0.95rem; }
.signature { margin-top: 25px; border-top: 1px solid rgba(255,255,255,0.2); padding-top: 15px; }

/* 5. HỆ GIÁ TRỊ TƯ TƯỞNG */
.values-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.value-card {
  background: #fff;
  padding: 35px 25px;
  border-radius: 8px;
  box-shadow: 0 5px 20px rgba(0,0,0,0.05);
  border: 1px solid #eee;
  text-align: center;
  transition: all 0.4s ease;
}

.icon-box {
  width: 75px;
  height: 75px;
  background: rgba(4, 37, 136, 0.08);
  color: #042588;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin: 0 auto 20px;
  transition: all 0.4s ease;
}

.value-card h3 { font-size: 1.3rem; color: #042588; margin-bottom: 12px; }

.value-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 25px rgba(4, 37, 136, 0.15);
  border-color: #042588;
}

.value-card:hover .icon-box {
  background: #042588;
  color: #fff;
  transform: rotateY(360deg);
}

/* 6. LỊCH SỬ HÌNH THÀNH (TIMELINE) */
/* TIMELINE NGANG SO LE (ALTERNATING TOP/BOTTOM) */
.timeline-h-container {
  overflow-x: auto;
  padding: 10px;
  cursor: grab;
  user-select: none;
  scroll-behavior: smooth;
}

.timeline-h-container:active {
  cursor: grabbing;
}

/* Thanh cuộn ngang mượt */
.timeline-h-container::-webkit-scrollbar {
  height: 6px;
}
.timeline-h-container::-webkit-scrollbar-thumb {
  background: #042588;
  border-radius: 4px;
}

/* Khung chứa cố định chiều cao để chứa đủ card Trên & Dưới */
/* 1. Đổi display sang inline-flex để track tự giãn rộng theo tổng số item bên trong */
.timeline-h-track {
  display: inline-flex;
  position: relative;
  min-width: 110%;
  height: 620px;
  align-items: center;
}

/* 2. Giới hạn chiều rộng đường kẻ bắt đầu từ giữa item đầu tiên đến giữa item cuối cùng */
.timeline-h-line {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 4px;
  background: #042588;
  transform: translateY(-50%);
  z-index: 1;
}

/* 3. Đảm bảo mỗi item luôn cố định đúng 1/3 chiều rộng màn hình */
.timeline-h-item {
  flex: 0 0 calc(100vw / 3); /* Mỗi item rộng đúng 1/3 viewport */
  width: calc(100vw / 3);
  max-width: calc(100vw / 3);
  position: relative;
  height: 100%;
  padding: 0 25px;
  box-sizing: border-box;
}

/* Tùy chọn: Nếu timeline nằm trong container có max-width (vd: 1200px), dùng kích thước này chuẩn hơn */
@media (min-width: 1200px) {
  .timeline-h-item {
    flex: 0 0 380px; /* Độ rộng cố định đẹp mắt cho màn hình lớn */
    width: 380px;
    max-width: 380px;
  }
}
/* Chấm tròn giữa đường kẻ */
.timeline-h-dot {
  width: 20px;
  height: 20px;
  background: #fff;
  border: 4px solid #042588;
  border-radius: 50%;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 2;
  transition: transform 0.3s ease, background-color 0.3s ease;
}

/* Styling Card chung */
.timeline-h-card {
  background: #fff;
  border-radius: 8px;
  padding: 15px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.08);
  transition: transform 0.3s ease;
}

.timeline-h-card img {
  width: 100%;
  height: 170px;
  object-fit: cover;
  border-radius: 6px;
  margin-bottom: 10px;
  pointer-events: none;
}

.timeline-h-card h3 {
  font-size: 1.05rem;
  color: #042588;
  margin-bottom: 5px;
}

.timeline-h-card p {
  font-size: 0.85rem;
  color: #666;
  line-height: 1.4;
}

/* --- CẤU HÌNH SO LE --- */

/* ITEM LẺ (1, 3, 5...): Card nằm Ở TRÊN, Ngày nằm DƯỚI đường kẻ */
.timeline-h-item:nth-child(odd) .timeline-h-card {
  position: absolute;
  bottom: calc(50% + 25px);
  left: 15px;
  right: 15px;
}

.timeline-h-item:nth-child(odd) .timeline-h-date {
  position: absolute;
  top: calc(50% + 15px);
  left: 50%;
  transform: translateX(-50%);
  font-weight: bold;
  color: #042588;
  font-size: 1.05rem;
}

/* ITEM CHẴN (2, 4, 6...): Card nằm Ở DƯỚI, Ngày nằm TRÊN đường kẻ */
.timeline-h-item:nth-child(even) .timeline-h-card {
  position: absolute;
  top: calc(50% + 25px);
  left: 15px;
  right: 15px;
}

.timeline-h-item:nth-child(even) .timeline-h-date {
  position: absolute;
  bottom: calc(50% + 15px);
  left: 50%;
  transform: translateX(-50%);
  font-weight: bold;
  color: #042588;
  font-size: 1.05rem;
}

/* --- HOVER EFFECTS --- */
.timeline-h-item:hover .timeline-h-dot {
  transform: translate(-50%, -50%) scale(1.3);
  background-color: #ff5722;
}

.timeline-h-item:nth-child(odd):hover .timeline-h-card {
  transform: translateY(-8px);
}

.timeline-h-item:nth-child(even):hover .timeline-h-card {
  transform: translateY(8px);
}

.timeline-hint {
  text-align: center;
  color: #888;
  font-size: 0.85rem;
  margin-top: 15px;
}
/* Ẩn thanh cuộn trên tất cả các trình duyệt */
.timeline-h-container {
  -ms-overflow-style: none;  /* IE and Edge */
  scrollbar-width: none;  /* Firefox */
}

.timeline-h-container::-webkit-scrollbar {
  display: none; /* Chrome, Safari, Opera */
}

/* 7. GIẢI THƯỞNG (GRID ALBUM) */
.awards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: 190px;
  gap: 15px;
}

.award-item { position: relative; overflow: hidden; border-radius: 8px; }
.award-item img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }

.award-item.item-large { grid-column: span 2; grid-row: span 2; }
.award-item.item-wide { grid-column: span 2; }

.award-overlay {
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(4, 37, 136, 0.85); color: #fff;
  display: flex; flex-direction: column; justify-content: center; align-items: center;
  padding: 20px; text-align: center; opacity: 0; transition: opacity 0.3s ease;
}

.award-item:hover img { transform: scale(1.08); }
.award-item:hover .award-overlay { opacity: 1; }
/* LIGHTBOX POPUP */
.award-item { cursor: pointer; }

.lightbox-modal {
  display: none;
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0, 0, 0, 0.9);
  z-index: 10000;
  justify-content: center;
  align-items: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.lightbox-modal.active {
  display: flex;
  opacity: 1;
}

.lightbox-content {
  max-width: 85%;
  max-height: 80vh;
  text-align: center;
}

.lightbox-content img {
  max-width: 100%;
  max-height: 75vh;
  border-radius: 6px;
  box-shadow: 0 5px 25px rgba(0,0,0,0.5);
}

.lightbox-caption {
  color: #fff;
  margin-top: 15px;
  font-size: 1.1rem;
  font-weight: 500;
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 35px;
  color: #fff;
  font-size: 40px;
  cursor: pointer;
  z-index: 10001;
}

.lightbox-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255,255,255,0.15);
  color: #fff;
  border: none;
  font-size: 24px;
  padding: 15px 20px;
  cursor: pointer;
  border-radius: 4px;
  transition: background 0.2s;
}

.lightbox-btn:hover { background: rgba(255,255,255,0.3); }
.lb-prev { left: 20px; }
.lb-next { right: 20px; }
/* 8. FORM NHẬN GIẢI PHÁP NGAY */
.sec-solution { background: linear-gradient(135deg, #042588 0%, #021244 100%); color: #fff; }
.solution-card { display: flex; gap: 40px; align-items: center; }
.solution-info { flex: 1; }
.solution-info h2 { font-size: 1.6rem; margin-bottom: 15px; line-height: 1.4; }
.solution-info p { color: #ccc; margin-bottom: 20px; }
.solution-features { list-style: none; }
.solution-features li { margin-bottom: 10px; }
.solution-features i { color: #28a745; margin-right: 8px; }

.solution-form-wrap {
  flex: 1; background: #fff; padding: 35px; border-radius: 10px; color: #333;
}
.solution-form-wrap h3 { text-align: center; color: #042588; margin-bottom: 20px; }
.solution-form-wrap .form-group { margin-bottom: 12px; }
.solution-form-wrap input, .solution-form-wrap textarea {
  width: 100%; padding: 10px 12px; border: 1px solid #ddd; border-radius: 4px;
}
.btn-submit-solution {
  width: 100%; background: #ff5722; color: #fff; border: none; padding: 12px;
  font-weight: bold; border-radius: 4px; cursor: pointer; transition: background 0.3s;
}
.btn-submit-solution:hover { background: #e64a19; }

/* RESPONSIVE */
@media (max-width: 992px) {
  .thu-ngo-wrapper { flex-direction: column; max-height: none; }
  .solution-card { flex-direction: column; }
  .awards-grid { grid-template-columns: repeat(2, 1fr); }
  .award-item.item-large, .award-item.item-wide { grid-column: span 1; grid-row: span 1; }
}

@media (max-width: 768px) {
  .timeline::after { left: 25px; }
  .timeline-item { width: 100%; padding-left: 60px; padding-right: 15px; }
  .timeline-item.right { left: 0%; }
  .timeline-item.left { text-align: left; }
  .timeline-item.left .timeline-dot, .timeline-item.right .timeline-dot { left: 16px; }
  .about-page .hero-content h1 {font-size: 2.4rem;letter-spacing: 0;line-height: 1.4;}
  .about-tab-nav {top: 78px;}
  .timeline-h-item {flex: 0 0 calc(100vw / 1);width: calc(100vw / 1);max-width: calc(100vw / 1);}
  .solution-form-wrap {width: 100%;}
}