/* ============ 公司简介页面专属样式 ============ */
.about-page {
  background: #fff;
  overflow: hidden;
}
.about-page .section-title {
  text-align: center;
  margin-bottom: 50px;
}
.about-page .section-title .sub {
  font-size: 14px;
  letter-spacing: 4px;
  color: var(--primary-color);
  text-transform: uppercase;
  font-weight: 600;
  margin-bottom: 10px;
}
.about-page .section-title h2 {
  font-size: 36px;
  font-weight: 700;
  color: #1a1a2e;
  margin: 0 0 16px;
}
.about-page .section-title .bar {
  width: 60px;
  height: 4px;
  background: var(--primary-color);
  margin: 0 auto;
  border-radius: 4px;
}
.about-page .section-title p {
  color: #666;
  font-size: 15px;
  line-height: 1.8;
  margin-top: 18px;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

/* ---- 公司概况 ---- */
.about-overview {
  padding: 80px 0;
  background: #fff;
}
.about-overview .ov-img {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 12px 40px rgba(0,0,0,.12);
}
.about-overview .ov-img img {
  width: 100%;
  height: 460px;
  object-fit: cover;
  transition: transform .8s ease;
}
.about-overview .ov-img:hover img {
  transform: scale(1.06);
}
.about-overview .ov-img .exp-badge {
  position: absolute;
  left: 30px;
  bottom: 30px;
  background: var(--primary-color);
  color: #fff;
  border-radius: 10px;
  padding: 18px 26px;
  box-shadow: 0 8px 24px rgba(0,0,0,.2);
}
.about-overview .ov-img .exp-badge .num {
  font-size: 38px;
  font-weight: 800;
  line-height: 1;
}
.about-overview .ov-img .exp-badge .txt {
  font-size: 13px;
  margin-top: 4px;
  letter-spacing: 1px;
}
.about-overview .ov-text h3 {
  font-size: 30px;
  font-weight: 700;
  color: #1a1a2e;
  margin-bottom: 8px;
}
.about-overview .ov-text .lead {
  color: var(--primary-color);
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 20px;
}
.about-overview .ov-text p {
  color: #555;
  font-size: 15px;
  line-height: 1.9;
  margin-bottom: 16px;
}
.about-overview .ov-list {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
}
.about-overview .ov-list li {
  display: flex;
  align-items: center;
  padding: 10px 0;
  font-size: 15px;
  color: #333;
}
.about-overview .ov-list li i {
  color: var(--primary-color);
  font-size: 18px;
  margin-right: 12px;
}

/* ---- 核心数据 ---- */
.about-stats {
  padding: 70px 0;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  position: relative;
  overflow: hidden;
}
.about-stats::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 20% 30%, rgba(255,255,255,.06) 0, transparent 40%),
                    radial-gradient(circle at 80% 70%, rgba(255,255,255,.05) 0, transparent 40%);
}
.about-stats .stat-item {
  text-align: center;
  color: #fff;
  padding: 20px 0;
}
.about-stats .stat-item .icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 18px;
  border-radius: 50%;
  background: rgba(255,255,255,.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  color: #fff;
  transition: all .4s ease;
}
.about-stats .stat-item:hover .icon {
  background: var(--primary-color);
  transform: translateY(-6px);
}
.about-stats .stat-item .number {
  font-size: 48px;
  font-weight: 800;
  line-height: 1;
  color: #fff;
}
.about-stats .stat-item .unit {
  font-size: 20px;
  font-weight: 700;
  color: #fff;
}
.about-stats .stat-item .label {
  font-size: 15px;
  color: rgba(255,255,255,.75);
  margin-top: 10px;
  letter-spacing: 1px;
}

/* ---- 核心优势 ---- */
.about-adv {
  padding: 80px 0;
  background: #f7f9fc;
}
.about-adv .adv-card {
  background: #fff;
  border-radius: 14px;
  padding: 36px 28px;
  text-align: center;
  box-shadow: 0 6px 20px rgba(0,0,0,.06);
  transition: all .4s ease;
  height: 100%;
  border: 1px solid #eef0f4;
}
.about-adv .adv-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 18px 40px rgba(0,0,0,.12);
  border-color: var(--primary-color);
}
.about-adv .adv-card .adv-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 22px;
  border-radius: 18px;
  background: linear-gradient(135deg, var(--primary-color), #2563eb);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 30px;
  transition: transform .4s ease;
}
.about-adv .adv-card:hover .adv-icon {
  transform: rotateY(360deg);
}
.about-adv .adv-card h4 {
  font-size: 18px;
  font-weight: 700;
  color: #1a1a2e;
  margin-bottom: 12px;
}
.about-adv .adv-card p {
  font-size: 14px;
  color: #666;
  line-height: 1.8;
  margin: 0;
}

/* ---- 产品与服务 ---- */
.about-prod {
  padding: 80px 0;
  background: #fff;
}
.about-prod .prod-item {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 24px;
  box-shadow: 0 6px 18px rgba(0,0,0,.08);
  transition: all .4s ease;
  display: block;
  color: inherit;
  text-decoration: none;
}
.about-prod .prod-item:hover {
  transform: translateY(-6px);
}
.about-prod .prod-item .pic {
  height: 220px;
  overflow: hidden;
}
.about-prod .prod-item .pic img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .6s ease;
}
.about-prod .prod-item:hover .pic img {
  transform: scale(1.1);
}
.about-prod .prod-item .info {
  padding: 20px;
  background: #fff;
}
.about-prod .prod-item .info h4 {
  font-size: 17px;
  font-weight: 700;
  color: #1a1a2e;
  margin: 0 0 8px;
}
.about-prod .prod-item .info p {
  font-size: 13px;
  color: #888;
  line-height: 1.7;
  margin: 0;
}
.about-prod .prod-item .info .prod-more {
  display: inline-block;
  margin-top: 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary-color);
  transition: transform .3s ease;
}
.about-prod .prod-item:hover .info .prod-more {
  transform: translateX(4px);
}
.about-prod .prod-item .info .prod-more i {
  font-size: 14px;
  margin-left: 4px;
}

/* ---- 发展历程（上下滚动时间轴） ---- */
.about-history {
  padding: 80px 0;
  background: #f7f9fc;
}
.tl-viewport {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  height: 620px;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: #c3cad6 transparent;
}
.tl-viewport::-webkit-scrollbar {
  width: 6px;
}
.tl-viewport::-webkit-scrollbar-track {
  background: transparent;
}
.tl-viewport::-webkit-scrollbar-thumb {
  background: #c3cad6;
  border-radius: 6px;
}
.about-history .timeline {
  position: relative;
  padding: 60px 0;
}
/* 轨道 */
.about-history .timeline::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 3px;
  background: #dfe4ec;
  transform: translateX(-50%);
}
/* 滚动进度线 */
.about-history .timeline-progress {
  position: absolute;
  left: 50%;
  top: 0;
  width: 3px;
  height: calc(var(--progress, 0) * 100%);
  max-height: 100%;
  background: linear-gradient(180deg, var(--primary-color), #2563eb);
  transform: translateX(-50%);
  border-radius: 3px;
  z-index: 1;
}
/* 上下边缘渐隐提示 */
.tl-fade {
  position: absolute;
  left: 0;
  right: 8px;
  height: 56px;
  pointer-events: none;
  z-index: 6;
  opacity: 1;
  transition: opacity .3s ease;
}
.tl-fade-top {
  top: 0;
  background: linear-gradient(180deg, #f7f9fc 30%, rgba(247,249,252,0));
}
.tl-fade-bottom {
  bottom: 0;
  background: linear-gradient(0deg, #f7f9fc 30%, rgba(247,249,252,0));
}
.tl-viewport.at-top .tl-fade-top,
.tl-viewport.at-bottom .tl-fade-bottom {
  opacity: 0;
}
.about-history .tl-item {
  position: relative;
  width: 50%;
  padding: 18px 40px;
  box-sizing: border-box;
}
.about-history .tl-item.left {
  left: 0;
  text-align: right;
}
.about-history .tl-item.right {
  left: 50%;
  text-align: left;
}
.about-history .tl-item .dot {
  position: absolute;
  top: 32px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--primary-color);
  box-shadow: 0 0 0 4px rgba(37,99,235,.15);
  z-index: 2;
  transition: all .35s ease;
}
.about-history .tl-item.left .dot {
  right: -8px;
}
.about-history .tl-item.right .dot {
  left: -8px;
}
.about-history .tl-item.active .dot {
  background: var(--primary-color);
  transform: scale(1.35);
  box-shadow: 0 0 0 6px rgba(37,99,235,.2);
}
.about-history .tl-item .tl-card {
  background: #fff;
  border-radius: 10px;
  padding: 20px 24px;
  box-shadow: 0 6px 18px rgba(0,0,0,.08);
  border: 1px solid transparent;
  transition: all .35s ease;
}
.about-history .tl-item.active .tl-card {
  border-color: var(--primary-color);
  box-shadow: 0 14px 32px rgba(37,99,235,.16);
}
.about-history .tl-item .year {
  font-size: 24px;
  font-weight: 800;
  color: var(--primary-color);
  margin-bottom: 6px;
}
.about-history .tl-item h4 {
  font-size: 16px;
  font-weight: 700;
  color: #1a1a2e;
  margin: 0 0 8px;
}
.about-history .tl-item p {
  font-size: 13px;
  color: #666;
  line-height: 1.7;
  margin: 0;
}
/* JS 就绪后的入场动画（由 IntersectionObserver 触发） */
.tl-viewport.is-ready .tl-item .tl-card {
  opacity: 0;
  transform: translateY(36px);
}
.tl-viewport.is-ready .tl-item.in .tl-card {
  opacity: 1;
  transform: translateY(0);
  transition: opacity .6s ease, transform .6s ease, border-color .35s ease, box-shadow .35s ease;
}
/* 上下控制按钮 */
.tl-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 22px;
  margin-top: 34px;
}
.tl-btn {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid #d5dbe5;
  background: #fff;
  color: var(--primary-color);
  font-size: 15px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all .3s ease;
  box-shadow: 0 4px 12px rgba(0,0,0,.06);
}
.tl-btn:hover:not(:disabled) {
  background: var(--primary-color);
  color: #fff;
  border-color: var(--primary-color);
  transform: translateY(-2px);
  box-shadow: 0 8px 18px rgba(37,99,235,.3);
}
.tl-btn:disabled {
  opacity: .35;
  cursor: not-allowed;
}
.tl-counter {
  font-size: 14px;
  color: #888;
  font-weight: 600;
  min-width: 64px;
  text-align: center;
}
.tl-counter .tl-cur {
  color: var(--primary-color);
  font-size: 22px;
  font-weight: 800;
}
.tl-tip {
  text-align: center;
  margin-top: 14px;
  font-size: 12px;
  color: #9aa2af;
  letter-spacing: 1px;
}

/* ---- 资质荣誉（证书画廊） ---- */
.about-honor {
  padding: 80px 0;
  background: #fff;
}
.honor-gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}
.honor-cert {
  position: relative;
  background: #fff;
  border: 1px solid #eef0f4;
  border-radius: 12px;
  padding: 16px 16px 0;
  cursor: pointer;
  overflow: hidden;
  transition: all .35s ease;
}
.honor-cert:hover {
  transform: translateY(-6px);
  border-color: var(--primary-color);
  box-shadow: 0 16px 34px rgba(0,0,0,.13);
}
.honor-cert .cert-pic {
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.honor-cert .cert-pic img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  transition: transform .5s ease;
}
.honor-cert:hover .cert-pic img {
  transform: scale(1.06);
}
.honor-cert .cert-zoom {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: rgba(0,0,0,.55);
  color: #fff;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: scale(.6);
  transition: all .3s ease;
}
.honor-cert:hover .cert-zoom {
  opacity: 1;
  transform: scale(1);
}
.honor-cert .cert-name {
  text-align: center;
  font-size: 14px;
  font-weight: 600;
  color: #333;
  margin: 14px 0 0;
  padding: 12px 0;
  border-top: 1px solid #f2f2f2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.honor-more {
  text-align: center;
  margin-top: 40px;
}
@media (min-width: 768px) {
  .honor-gallery {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
  .honor-cert {
    padding: 20px 20px 0;
  }
  .honor-cert .cert-pic {
    height: 230px;
  }
}
@media (min-width: 1200px) {
  .honor-gallery {
    grid-template-columns: repeat(5, 1fr);
  }
}

/* ---- CTA ---- */
.about-cta {
  padding: 70px 0;
  background: linear-gradient(135deg, var(--primary-color), #1e40af);
  text-align: center;
  color: #fff;
}
.about-cta h2 {
  font-size: 32px;
  font-weight: 700;
  margin: 0 0 14px;
}
.about-cta p {
  font-size: 15px;
  opacity: .9;
  margin: 0 0 28px;
}
.about-cta .cta-btn {
  display: inline-block;
  background: #fff;
  color: var(--primary-color);
  font-size: 15px;
  font-weight: 600;
  padding: 14px 40px;
  border-radius: 50px;
  text-decoration: none;
  transition: all .3s ease;
}
.about-cta .cta-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 24px rgba(0,0,0,.25);
  color: var(--primary-color);
}

/* ---- 响应式 ---- */
@media (max-width: 767px) {
  .about-overview .ov-img img { height: 320px; }
  .about-overview .ov-text h3 { font-size: 24px; }
  .about-stats .stat-item .number { font-size: 36px; }
  .tl-viewport { height: 460px; }
  .about-history .timeline::before { left: 18px; }
  .about-history .timeline-progress { left: 18px; }
  .about-history .tl-item { width: 100%; left: 0 !important; text-align: left !important; padding: 14px 12px 14px 50px; }
  .about-history .tl-item .dot { left: 10px !important; right: auto !important; top: 26px; }
}