/* ========== 全局重置与变量 ========== */
:root {
  --primary-dark: #0A1F44;
  --primary: #0D2B5E;
  --primary-light: #1A4A8A;
  --accent: #C8102E;
  --accent-light: #E63946;
  --bg-white: #FFFFFF;
  --bg-light: #F5F7FA;
  --bg-gray: #EEF1F6;
  --text-dark: #1A1A2E;
  --text-main: #333333;
  --text-sub: #666666;
  --text-light: #999999;
  --border: #E0E4EA;
  --shadow: 0 4px 20px rgba(10, 31, 68, 0.08);
  --shadow-hover: 0 8px 30px rgba(10, 31, 68, 0.15);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  color: var(--text-main);
  background: var(--bg-white);
  line-height: 1.6;
  overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ========== 顶部导航 ========== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  transition: var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo img {
  height: 40px;
  width: auto;
}

.logo-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-dark);
  letter-spacing: 1px;
}

.logo-sub {
  font-size: 12px;
  color: var(--text-sub);
  letter-spacing: 2px;
  margin-top: 2px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-item {
  position: relative;
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-main);
  cursor: pointer;
  transition: var(--transition);
  border-radius: 4px;
}

.nav-item:hover, .nav-item.active {
  color: var(--accent);
}

.nav-item::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: var(--transition);
}

.nav-item:hover::after, .nav-item.active::after {
  width: 60%;
}

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--primary-dark);
  transition: var(--transition);
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}
.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* 移动端隐藏菜单 */
.mobile-menu {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.99);
  backdrop-filter: blur(10px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  padding: 16px 0;
  z-index: 999;
  transform: translateY(-10px);
  opacity: 0;
  transition: var(--transition);
  pointer-events: none;
}

.mobile-menu.active {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.mobile-menu-item {
  display: block;
  padding: 14px 32px;
  font-size: 16px;
  color: var(--text-main);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.mobile-menu-item:hover {
  color: var(--accent);
  background: var(--bg-light);
  padding-left: 40px;
}

/* ========== 轮播Banner ========== */
.banner {
  position: relative;
  width: 100%;
  height: 560px;
  margin-top: 72px;
  overflow: hidden;
}

.banner-slides {
  position: relative;
  width: 100%;
  height: 100%;
}

.banner-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 0.8s ease;
  display: flex;
  align-items: center;
}

.banner-slide.active {
  opacity: 1;
  z-index: 1;
}

/* Banner1 - 发展历程 */
.banner-1 {
 position: relative;
     background: url(../images/banner1.jpg) center / cover no-repeat;
     overflow: hidden;
     display: flex;
     align-items: center;
     justify-content: center;
}


.banner-content {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  color: #fff;
}

.banner-title {
  font-size: 42px;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.banner-subtitle {
  font-size: 18px;
  opacity: 0.85;
  margin-bottom: 40px;
  letter-spacing: 1px;
}

/* 发展历程时间轴 */
.timeline {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  position: relative;
  margin-top: 30px;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 20px;
  left: 5%;
  right: 5%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light), var(--accent));
  border-radius: 2px;
}

.timeline-item {
  flex: 1;
  text-align: center;
  position: relative;
  padding: 0 20px;
}

.timeline-dot {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent);
  border: 4px solid #fff;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  box-shadow: 0 4px 15px rgba(200, 16, 46, 0.4);
  position: relative;
  z-index: 2;
}

.timeline-year {
  font-size: 28px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
}

.timeline-text {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.85);
  text-align: left;
  background: rgba(255, 255, 255, 0.08);
  padding: 16px;
  border-radius: 8px;
  border-left: 3px solid var(--accent);
  backdrop-filter: blur(4px);
}

/* Banner2 - 分支机构 */
.banner-2 {
  background: url(../images/banner2.jpg) center / cover no-repeat;
}



.branches {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-top: 20px;
  position: relative;
  z-index: 2;
}

.branch-card {
  flex: 1;
  max-width: 360px;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border-radius: 12px;
  padding: 30px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: var(--transition);
}

.branch-card:hover {
  transform: translateY(-8px);
  background: rgba(255, 255, 255, 0.15);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}

.branch-year {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 14px;
}

.branch-location {
  font-size: 22px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

.branch-name {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 12px;
  font-weight: 500;
}

.branch-desc {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.75);
  line-height: 1.7;
}

.branch-tags {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.branch-tag {
  background: rgba(255, 255, 255, 0.15);
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.9);
}

/* Banner3 - 企业文化 */
.banner-3 {
  background: url(../images/banner3.jpg) center / cover no-repeat;
 }
}

.banner-3::before {
  content: '';
}

.culture-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 20px;
  position: relative;
  z-index: 2;
}

.culture-item {
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(8px);
  border-radius: 10px;
  padding: 24px;
  border-left: 4px solid var(--accent);
  transition: var(--transition);
}

.culture-item:hover {
  background: rgba(255, 255, 255, 0.12);
  transform: translateX(6px);
}

.culture-label {
  font-size: 13px;
  color: var(--accent-light);
  font-weight: 600;
  letter-spacing: 1px;
  margin-bottom: 6px;
  text-transform: uppercase;
}

.culture-value {
  font-size: 18px;
  color: #fff;
  font-weight: 600;
  line-height: 1.5;
}

.culture-features {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 10px;
}

.culture-feature {
  background: rgba(200, 16, 46, 0.7);
  color: #fff;
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 13px;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

/* Banner 指示器 */
.banner-dots {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
  z-index: 10;
}

.banner-dot {
  width: 40px;
  height: 4px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 2px;
  cursor: pointer;
  transition: var(--transition);
}

.banner-dot.active {
  background: var(--accent);
  width: 50px;
}

.banner-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(4px);
  border: none;
  border-radius: 50%;
  color: #fff;
  font-size: 20px;
  cursor: pointer;
  z-index: 10;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.banner-arrow:hover {
  background: var(--accent);
}

.banner-arrow.prev { left: 30px; }
.banner-arrow.next { right: 30px; }

/* ========== 通用Section样式 ========== */
.section {
  padding: 80px 0;
}

.section-alt {
  background: var(--bg-light);
}

.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.section-title-en {
  font-size: 14px;
  color: var(--text-light);
  letter-spacing: 4px;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section-line {
  width: 50px;
  height: 3px;
  background: var(--accent);
  margin: 0 auto;
  border-radius: 2px;
}

/* ========== 关于我们 ========== */
.about-overview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
  margin-bottom: 60px;
}

.about-text h3 {
  font-size: 24px;
  color: var(--primary-dark);
  margin-bottom: 16px;
  padding-left: 14px;
  border-left: 4px solid var(--accent);
}

.about-text p {
  font-size: 15px;
  color: var(--text-sub);
  line-height: 1.9;
  margin-bottom: 20px;
}

.about-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.about-feature {
  background: var(--bg-white);
  padding: 20px;
  border-radius: 8px;
  box-shadow: var(--shadow);
  border-top: 3px solid var(--primary);
  transition: var(--transition);
}

.about-feature:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-top-color: var(--accent);
}

.about-feature h4 {
  font-size: 16px;
  color: var(--primary-dark);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.about-feature h4::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
}

.about-feature p {
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.7;
  margin: 0;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.stat-card {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  border-radius: 12px;
  padding: 28px 16px;
  text-align: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
}

.stat-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 30px rgba(10, 31, 68, 0.25);
}

.stat-card:nth-child(even) {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
}

.stat-number {
  font-size: 32px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 6px;
  line-height: 1.2;
}

.stat-unit {
  font-size: 16px;
  font-weight: 500;
  opacity: 0.9;
}

.stat-label {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.8);
  letter-spacing: 1px;
}

/* 企业资质 */
.qualification-title {
  text-align: center;
  font-size: 28px;
  color: var(--primary-dark);
  margin-bottom: 30px;
  font-weight: 700;
}

.qualification-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.qualification-item {
  background: var(--bg-white);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid var(--border);
}

.qualification-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--accent);
}

.qualification-img {
  width: 100%;
  height: 200px;
  object-fit: contain;
  background: var(--bg-light);
  padding: 16px;
  transition: var(--transition);
}

.qualification-item:hover .qualification-img {
  transform: scale(1.05);
}

.qualification-name {
  padding: 14px 16px;
  text-align: center;
  font-size: 14px;
  font-weight: 600;
  color: var(--primary-dark);
  background: var(--bg-white);
  border-top: 1px solid var(--border);
}

/* 资质横向滚动提示（仅手机端显示） */
.qualification-scroll-hint {
  display: none;
}

/* ========== 技术平台 ========== */
.tech-platform {
  /*background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);*/
  color: #fff;
  background: url(../images/yewu_bj.jpg) center / cover no-repeat;
}

.tech-platform .section-title { color: #fff; }
.tech-platform .section-title-en { color: rgba(255,255,255,0.5); }

.tech-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.tech-card {
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(10px);
  border-radius: 14px;
  padding: 36px 28px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  transition: var(--transition);
}

.tech-card:hover {
  transform: translateY(-8px);
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--accent);
}

.tech-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin-bottom: 20px;
  box-shadow: 0 4px 20px rgba(200, 16, 46, 0.3);
}

.tech-card h3 {
  font-size: 20px;
  margin-bottom: 16px;
  color: #fff;
}

.tech-features {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.tech-feature {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.85);
}

.tech-feature::before {
  content: '✓';
  width: 20px;
  height: 20px;
  background: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  flex-shrink: 0;
}

/* ========== 核心业务 ========== */
.business-tabs {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 40px;
}

.business-tab {
  padding: 14px 36px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-sub);
  background: var(--bg-white);
  border: 2px solid var(--border);
  border-radius: 30px;
  cursor: pointer;
  transition: var(--transition);
}

.business-tab:hover {
  border-color: var(--primary-light);
  color: var(--primary);
}

.business-tab.active {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  border-color: var(--primary);
  box-shadow: 0 4px 15px rgba(13, 43, 94, 0.3);
}

.business-content {
  display: none;
  animation: fadeIn 0.5s ease;
}

.business-content.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.business-panel {
  background: var(--bg-white);
  border-radius: 14px;
  padding: 40px;
  box-shadow: var(--shadow);
}

.business-panel-title {
  font-size: 24px;
  color: var(--primary-dark);
  margin-bottom: 24px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--bg-gray);
  display: flex;
  align-items: center;
  gap: 12px;
}

.business-panel-title::before {
  content: '';
  width: 4px;
  height: 24px;
  background: var(--accent);
  border-radius: 2px;
}

.business-items {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 20px;
}

.business-item {
  background: var(--bg-light);
  border-radius: 10px;
  padding: 24px;
  text-align: center;
  transition: var(--transition);
  border: 1px solid transparent;
}

.business-item:hover {
  background: var(--bg-white);
  border-color: var(--primary-light);
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}

.business-item-icon {
  width: 50px;
  height: 50px;
  margin: 0 auto 14px;
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 22px;
}

.business-item h4 {
  font-size: 16px;
  color: var(--primary-dark);
  margin-bottom: 8px;
}

.business-item p {
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.6;
}

/* ========== 供应链 ========== */
.supply-partners {
  margin-bottom: 60px;
}

.partner-tabs {
  display: flex;
  justify-content: center;
  gap: 0;
  margin-bottom: 36px;
  background: var(--bg-white);
  border-radius: 10px;
  padding: 6px;
  box-shadow: var(--shadow);
  width: fit-content;
  margin-left: auto;
  margin-right: auto;
}

.partner-tab {
  padding: 12px 40px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-sub);
  cursor: pointer;
  transition: var(--transition);
  border-radius: 8px;
}

.partner-tab.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: #fff;
  box-shadow: 0 4px 12px rgba(200, 16, 46, 0.3);
}

.partner-content {
  display: none;
  animation: fadeIn 0.5s ease;
}

.partner-content.active {
  display: block;
}

.partner-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
}

.partner-logo {
  background: var(--bg-white);
  border-radius: 8px;
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 90px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid var(--border);
}

.partner-logo:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary-light);
}

.partner-logo img {
  max-height: 50px;
  max-width: 100%;
  object-fit: contain;
  filter: grayscale(30%);
  transition: var(--transition);
}

.partner-logo:hover img {
  filter: grayscale(0%);
}

/* 供应链logo滚动 */
.supply-scroll-title {
  text-align: center;
  font-size: 24px;
  color: var(--primary-dark);
  margin-bottom: 30px;
  font-weight: 700;
}

.scroll-wrapper {
  overflow: hidden;
  position: relative;
  padding: 20px 0;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
}

.scroll-track {
  display: flex;
  gap: 24px;
  animation: scrollLeft 40s linear infinite;
  width: max-content;
}

.scroll-track:hover {
  animation-play-state: paused;
}

@keyframes scrollLeft {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.scroll-item {
  flex-shrink: 0;
  width: 160px;
  height: 80px;
  background: var(--bg-white);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
  padding: 12px;
}

.scroll-item img {
  max-height: 50px;
  max-width: 100%;
  object-fit: contain;
}

/* ========== 成功案例 ========== */
.case-section {
  background: var(--bg-light);
}

.case-categories {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.case-cat {
  padding: 10px 28px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-sub);
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: 24px;
  cursor: pointer;
  transition: var(--transition);
}

.case-cat:hover, .case-cat.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.case-card {
  background: var(--bg-white);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  display: flex;
}

.case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.case-card-img {
  width: 180px;
  flex-shrink: 0;
  background: var(--bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.case-card-img img {
  max-width: 100%;
  max-height: 100px;
  object-fit: contain;
}

.case-card-content {
  flex: 1;
  padding: 24px;
}

.case-card-tag {
  display: inline-block;
  background: rgba(200, 16, 46, 0.1);
  color: var(--accent);
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 10px;
}

.case-card h4 {
  font-size: 18px;
  color: var(--primary-dark);
  margin-bottom: 10px;
}

.case-card p {
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.7;
}

/* ========== 底部 ========== */
.footer {
  background: var(--primary-dark);
  color: rgba(255, 255, 255, 0.8);
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand img {
  height: 44px;
  margin-bottom: 16px;
  filter: brightness(0) invert(1);
}

.footer-brand p {
  font-size: 13px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.6);
}

.footer-col h4 {
  font-size: 16px;
  color: #fff;
  margin-bottom: 20px;
  font-weight: 600;
}

.footer-col ul li {
  margin-bottom: 12px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  transition: var(--transition);
}

.footer-col ul li:hover {
  color: var(--accent-light);
  padding-left: 6px;
}

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 14px;
  font-size: 14px;
  line-height: 1.7;
}

.footer-contact-item .icon {
  flex-shrink: 0;
  width: 20px;
  text-align: center;
  color: var(--accent-light);
}

.footer-bottom {
  padding: 20px 0;
  text-align: center;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.4);
}

/* ========== 回到顶部 ========== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 20px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  transition: var(--transition);
  opacity: 0;
  visibility: hidden;
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--accent);
  transform: translateY(-4px);
}

/* ========== 图片放大Lightbox ========== */
.lightbox {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.9);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  cursor: zoom-out;
}

.lightbox.active {
  display: flex;
}

.lightbox img {
  max-width: 90%;
  max-height: 90%;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: 0 0 50px rgba(0, 0, 0, 0.5);
}

.lightbox-close {
  position: absolute;
  top: 30px;
  right: 30px;
  width: 44px;
  height: 44px;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  border-radius: 50%;
  color: #fff;
  font-size: 24px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.lightbox-close:hover {
  background: var(--accent);
  transform: rotate(90deg);
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .nav { display: none; }
  .menu-toggle { display: flex; }
  .mobile-menu { display: block; }
  
  .banner { height: auto; min-height: 480px; padding: 40px 0; }
  .banner-title { font-size: 32px; }
  .timeline { flex-direction: column; gap: 30px; }
  .timeline::before { display: none; }
  .branches { flex-direction: column; align-items: center; }
  .branch-card { max-width: 100%; }
  .culture-grid { grid-template-columns: 1fr; }
  
  .about-overview { grid-template-columns: 1fr; }
  .qualification-grid { grid-template-columns: repeat(2, 1fr); }
  .tech-grid { grid-template-columns: 1fr; }
  .business-items { grid-template-columns: repeat(2, 1fr); }
  .partner-grid { grid-template-columns: repeat(3, 1fr); }
  .case-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
	
  .container { padding: 0 16px; }
  .section { padding: 50px 0; }
  .section-title { font-size: 28px; }
  .section-header { margin-bottom: 28px; }
  .banner-title { font-size: 26px; }
  .banner-subtitle { font-size: 15px; }

  /* 顶部Logo：公司名称放到Logo下方 */
  .logo {
    flex-direction: column;
    align-items: center;
    gap: 1px;
  }
  .logo img { height: 26px; }
  .logo-sub {
    font-size: 10px;
    letter-spacing: 1px;
    margin-top: 0;
    line-height: 1.2;
    white-space: nowrap;
  }

  /* ========== Banner：压缩高度，轮播指示条可见 ========== */
  .banner { height: 600px; min-height: 0; padding: 24px 0; }
  .banner-title { font-size: 24px; margin-bottom: 8px; }
  .banner-subtitle { font-size: 13px; margin-bottom: 16px; letter-spacing: 1px; }
  .banner-title, .banner-subtitle { text-shadow: 0 2px 10px rgba(0, 0, 0, 0.35); }
  .banner-dots { bottom: 20px; gap: 8px; }
  .banner-dot {
    width: 28px;
    height: 6px;
    background: rgba(255, 255, 255, 0.5);
    box-shadow: 0 0 6px rgba(0, 0, 0, 0.35);
  }
  .banner-dot.active { width: 38px; background: var(--accent); }

  /* Banner1 时间轴：改为 圆点+文字 横排，大幅压缩高度 */
  .timeline { gap: 10px; margin-top: 10px; }
  .timeline-item { display: flex; align-items: center; gap: 12px; text-align: left; padding: 0; }
  .timeline-dot { width: 34px; height: 34px; margin: 0; flex-shrink: 0; font-size: 12px; }
  .timeline-year { font-size: 17px; margin-bottom: 2px; }
  .timeline-text { padding: 8px 12px; font-size: 12px; line-height: 1.5; }

  /* Banner2 分支机构：三块区域强制等高，标签贴底居中 */
  .branches {
    display: grid;
    grid-template-rows: repeat(3, 1fr);
    gap: 10px;
    margin-top: 10px;
  }
  .branch-card {
    display: flex;
    flex-direction: column;
    padding: 12px 14px;
    min-height: 128px;
  }
  .branch-year { display: inline-block; margin-bottom: 0; margin-right: 8px; font-size: 11px; padding: 2px 10px; }
  .branch-location { display: inline; font-size: 13px; font-weight: 600; margin-bottom: 0; }
  .branch-name { font-size: 13px; margin-bottom: 6px; }
  .branch-desc {
    font-size: 11px;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }
  .branch-tags {
    margin-top: auto;
    padding-top: 8px;
    gap: 6px;
    justify-content: center;
  }
  .branch-tag { font-size: 10px; padding: 2px 8px; }

  /* Banner3 企业文化：紧凑卡片 */
  .culture-grid { gap: 10px; margin-top: 10px; }
  .culture-item { padding: 12px 14px; }
  .culture-label { font-size: 11px; margin-bottom: 4px; }
  .culture-value { font-size: 14px; line-height: 1.4; }
  .culture-features { gap: 6px; margin-top: 6px; }
  .culture-feature { font-size: 11px; padding: 3px 10px; }

  /* 企业资质：横向滚动卡片，保留点击放大 */
  .qualification-title { font-size: 22px; margin-bottom: 16px; }
  .qualification-grid {
    display: flex;
    flex-wrap: nowrap;
    gap: 12px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scroll-snap-type: x mandatory;
    margin: 0 -16px;
    padding: 2px 16px 10px;
    scrollbar-width: none;
  }
  .qualification-grid::-webkit-scrollbar { display: none; }
  .qualification-item {
    flex: 0 0 43%;
    width: 43%;
    scroll-snap-align: start;
    opacity: 1 !important;
    transform: none !important;
  }
  .qualification-item:hover { transform: none; }
  .qualification-item:hover .qualification-img { transform: none; }
  .qualification-img { height: 120px; padding: 10px; }
  .qualification-name { font-size: 12px; padding: 10px 8px; }
  .qualification-scroll-hint {
    display: block;
    margin-top: 8px;
    text-align: center;
    font-size: 12px;
    color: var(--text-light);
    letter-spacing: 1px;
  }

  .business-items { grid-template-columns: 1fr; }

  /* 合作伙伴 / 供应链：3 个 logo 一排 */
  .supply-partners { margin-bottom: 40px; }
  .partner-tabs { margin-bottom: 24px; padding: 5px; }
  .partner-tab { padding: 9px 14px; font-size: 14px; }
  .partner-grid { grid-template-columns: repeat(3, 1fr); gap: 10px; }
  .partner-logo { height: 72px; padding: 10px; }
  .partner-logo img { max-height: 40px; }
  .supply-scroll-title { font-size: 20px; margin-bottom: 20px; }

  /* 核心业务：3 个切换按钮并排 */
  .business-tabs { flex-direction: row; gap: 8px; }
  .business-tab {
	text-align: center;
    flex: 1;
    width: auto;
    min-width: 0;
    padding: 10px 2px;
    font-size: 13px;
    white-space: nowrap;
    border-width: 1px;
  }
  .business-panel { padding: 16px; }
  .business-panel-title { justify-content: center; font-size: 18px; margin-bottom: 12px; padding-bottom: 10px; }

  /* 成功案例：2 列紧凑卡片，降低整体高度 */
  .case-categories { gap: 8px; margin-bottom: 24px; }
  .case-cat { padding: 8px 14px; font-size: 13px; }
  .case-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .case-card { flex-direction: column; }
  .case-card-img { width: 100%; height: 84px; padding: 8px; }
  .case-card-content { padding: 12px; }
  .case-card-tag { font-size: 10px; padding: 2px 8px; margin-bottom: 6px; }
  .case-card h4 { font-size: 14px; line-height: 1.4; margin-bottom: 6px; }
  .case-card p {
    font-size: 12px;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  /* 底部：品牌居中 + 隐藏快速导航 + 服务网络/联系我们上下平铺 */
  .footer { padding: 30px 0 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 20px 16px; padding-bottom: 24px; }
  .footer-brand { grid-column: 1 / -1; text-align: center; }
  .footer-brand img { height: 34px; margin: 0 auto 10px; }
  .footer-brand p { font-size: 11px; line-height: 1.6; }

  .footer-col-nav { display: none; }

  .footer-col-service { grid-column: 1 / -1; text-align: center; }
  .footer-col-service h4 { margin-bottom: 12px; }
  .footer-col-service ul {
    display: flex;
    justify-content: center;
    gap: 40px;
  }
  .footer-col-service ul li { margin: 0; font-size: 13px; }
  .footer-col-service ul li:hover { padding-left: 0; color: var(--accent-light); }

  .footer-col-contact {
    grid-column: 1 / -1;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 10px 24px;
  }
  .footer-col-contact h4 { flex-basis: 100%; text-align: center; margin-bottom: 4px; }
  .footer-col-contact > .footer-contact-item:first-of-type {
    flex-basis: 100%;
    justify-content: center;
  }
  .footer-contact-item {
    flex-direction: row;
    align-items: center;
    gap: 8px;
    margin: 0;
    font-size: 12px;
    line-height: 1.5;
    text-align: left;
  }
  .footer-contact-item .icon { width: auto; font-size: 14px; }
  .footer-bottom { padding: 12px 0; font-size: 11px; }

  .about-features { grid-template-columns: 1fr; }
  .banner-arrow { display: none; }
}