/* ==================== 全局变量 ==================== */
:root {
  --primary: #1a5276;
  --primary-light: #2874a6;
  --accent: #27ae60;
  --text: #333;
  --text-light: #666;
  --bg-light: #f5f6f7;
  --border: #e5e7eb;
  --shadow: 0 2px 12px rgba(0,0,0,0.06);
  --shadow-hover: 0 8px 30px rgba(0,0,0,0.15);
  --radius: 8px;
  --dark-bg: #1e252b;
  --dark-text: #cfd8dc;
  --yellow: #f5c518;
  --yellow-hover: #e8b800;
}

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

body {
  font-family: -apple-system, "Microsoft YaHei", "PingFang SC", sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: #fff;
}

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

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ==================== 按钮 ==================== */
.btn {
  display: inline-block;
  padding: 12px 30px;
  border-radius: 6px;
  font-size: 15px;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all 0.3s;
  text-align: center;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-light); transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.btn-outline { border-color: var(--primary); color: var(--primary); background: transparent; }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-success { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-success:hover { background: #229954; transform: translateY(-2px); }

.btn-more {
  display: inline-block;
  padding: 11px 30px;
  border: 1px solid var(--primary);
  color: var(--primary);
  border-radius: 4px;
  font-size: 14px;
  transition: all 0.2s;
}
.btn-more:hover {
  background: var(--primary);
  color: #fff;
}

/* 全宽黄色获取报价按钮 */
.quote-btn-full {
  display: block;
  width: 100%;
  padding: 15px 20px;
  background: var(--yellow);
  color: #222;
  border: none;
  border-radius: 8px;
  font-size: 17px;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  transition: background 0.2s, transform 0.15s;
  box-sizing: border-box;
  margin-top: 10px;
}
.quote-btn-full:hover {
  background: var(--yellow-hover);
  transform: translateY(-2px);
}
.quote-btn-full:active {
  transform: translateY(0);
}

/* ==================== 区块标题 ==================== */
.section-header {
  text-align: center;
  margin-bottom: 40px;
}
.section-header h2 {
  font-size: 32px;
  color: var(--text);
  margin-bottom: 10px;
}
.section-header p {
  font-size: 13px;
  color: var(--text-light);
  letter-spacing: 3px;
  text-transform: uppercase;
}

/* ==================== 深色顶部导航 ==================== */
.header-dark {
  background: var(--dark-bg);
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0,0,0,0.2);
}
.header-dark-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  gap: 30px;
}
.logo-dark {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-size: 17px;
  font-weight: 600;
  white-space: nowrap;
}
.logo-dark span:last-child {
  font-size: 20px;
  font-weight: 700;
}
.nav-dark ul {
  display: flex;
  list-style: none;
  gap: 5px;
}
.nav-dark ul li a {
  display: block;
  padding: 10px 16px;
  color: var(--dark-text);
  font-size: 14px;
  border-radius: 4px;
  transition: all 0.2s;
}
.nav-dark ul li a:hover,
.nav-dark ul li a.active {
  background: rgba(255,255,255,0.08);
  color: #fff;
}
.search-box {
  display: flex;
  background: #fff;
  border-radius: 4px;
  overflow: hidden;
  flex-shrink: 0;
}
.search-box input {
  border: none;
  outline: none;
  padding: 9px 14px;
  font-size: 14px;
  width: 180px;
}
.search-box button {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 0 18px;
  cursor: pointer;
  font-size: 14px;
  transition: background 0.2s;
}
.search-box button:hover { background: var(--primary-light); }

/* ==================== 移动端汉堡按钮 ==================== */
.mobile-toggle {
  display: none;
  background: none;
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: 6px;
  width: 44px;
  height: 40px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  cursor: pointer;
  padding: 0;
  transition: border-color 0.2s;
}
.mobile-toggle:hover { border-color: rgba(255,255,255,0.6); }
.mobile-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all 0.3s;
}
.mobile-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.mobile-toggle.active span:nth-child(2) { opacity: 0; }
.mobile-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.header-collapse {
  display: flex;
  align-items: center;
  gap: 30px;
}

/* ==================== Banner 轮播 ==================== */
.banner-slider {
  position: relative;
  width: 100%;
  height: 480px;
  overflow: hidden;
  background: var(--primary);
}
.banner-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.8s ease, visibility 0.8s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}
.banner-slide.active {
  opacity: 1;
  visibility: visible;
  z-index: 2;
}
.banner-slide .banner-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  z-index: 1;
}
.banner-slide .banner-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.35);
}
.banner-slide .banner-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: #fff;
  max-width: 800px;
  padding: 0 30px;
}
.banner-slide .banner-content h2 {
  font-size: 44px;
  font-weight: 700;
  margin-bottom: 20px;
  line-height: 1.3;
  text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}
.banner-slide .banner-content p {
  font-size: 17px;
  margin-bottom: 30px;
  opacity: 0.95;
  text-shadow: 0 1px 5px rgba(0,0,0,0.3);
}
.banner-slide .banner-content .btn {
  padding: 13px 38px;
  font-size: 15px;
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}
.banner-slide .banner-content .btn:hover {
  background: var(--primary-light);
  border-color: var(--primary-light);
}

.banner-dots {
  position: absolute;
  bottom: 22px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  gap: 12px;
}
.banner-dots .dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: rgba(255,255,255,0.5);
  cursor: pointer;
  transition: all 0.3s;
}
.banner-dots .dot.active {
  background: #fff;
  width: 28px;
  border-radius: 6px;
}
.banner-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(255,255,255,0.15);
  color: #fff;
  border: none;
  cursor: pointer;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s;
}
.banner-arrow:hover { background: rgba(255,255,255,0.35); }
.banner-arrow.prev { left: 22px; }
.banner-arrow.next { right: 22px; }

/* ==================== 产品卡片（深色风格） ==================== */
.product-grid-dark {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.product-card-dark {
  display: block;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  transition: all 0.25s;
}
.product-card-dark:hover {
  border-color: var(--primary);
  box-shadow: 0 6px 20px rgba(26,82,118,0.12);
  transform: translateY(-3px);
}
.product-card-dark .pc-img {
  aspect-ratio: 1;
  background: #fafafa;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 15px;
  border-bottom: 1px solid #f0f0f0;
}
.product-card-dark .pc-img img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  transition: transform 0.3s;
}
.product-card-dark:hover .pc-img img {
  transform: scale(1.06);
}
.product-card-dark .pc-body {
  padding: 14px 16px 16px;
}
.product-card-dark .pc-body h4 {
  font-size: 15px;
  color: #222;
  line-height: 1.4;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 42px;
}
.product-card-dark .pc-features {
  font-size: 12px;
  color: #888;
  line-height: 1.5;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 36px;
}
.product-card-dark .pc-btn {
  display: inline-block;
  padding: 6px 14px;
  font-size: 13px;
  color: var(--primary);
  border: 1px solid var(--primary);
  border-radius: 4px;
  transition: all 0.2s;
}
.product-card-dark:hover .pc-btn {
  background: var(--primary);
  color: #fff;
}

/* ==================== 优势卡片 ==================== */
.advantage-card {
  background: #fff;
  padding: 30px 20px;
  text-align: center;
  border-radius: 6px;
  border: 1px solid var(--border);
  transition: all 0.25s;
}
.advantage-card:hover {
  border-color: var(--primary);
  box-shadow: 0 6px 20px rgba(26,82,118,0.1);
  transform: translateY(-3px);
}
.advantage-card i {
  font-size: 34px;
  color: var(--primary);
  margin-bottom: 15px;
}
.advantage-card h4 {
  font-size: 16px;
  color: #222;
  margin-bottom: 8px;
}
.advantage-card p {
  font-size: 13px;
  color: #888;
  line-height: 1.6;
}

/* ==================== 深色页脚 ==================== */
.footer-dark {
  background: var(--dark-bg);
  color: #b0bec5;
  padding: 50px 0 20px;
  margin-top: 0;
}
.footer-dark-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 30px;
}
.footer-dark-grid h3 {
  color: #fff;
  font-size: 17px;
  margin-bottom: 15px;
}
.footer-dark-grid h4 {
  color: #fff;
  font-size: 15px;
  margin-bottom: 15px;
}
.footer-dark-grid p {
  font-size: 13px;
  line-height: 1.9;
  margin-bottom: 6px;
}
.footer-dark-grid p i {
  margin-right: 8px;
  color: var(--primary-light);
}
.footer-dark-grid ul {
  list-style: none;
}
.footer-dark-grid ul li {
  margin-bottom: 8px;
}
.footer-dark-grid ul li a {
  font-size: 13px;
  color: #b0bec5;
  transition: color 0.2s;
}
.footer-dark-grid ul li a:hover { color: #fff; }
.footer-dark-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 20px;
  text-align: center;
  font-size: 13px;
  color: #7f8c8d;
}

/* ==================== 悬浮按钮（右侧竖排） ==================== */
.float-service-dark {
  position: fixed;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.float-item {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
  cursor: pointer;
  transition: all 0.25s;
  box-shadow: 0 3px 10px rgba(0,0,0,0.15);
  text-decoration: none;
}
.float-item:hover { transform: scale(1.12); }
.float-phone { background: #e74c3c; }
.float-wechat { background: #27ae60; }
.float-kefu { background: #3498db; }
.float-message { background: #f39c12; }
.float-top { background: #7f8c8d; }

/* ==================== 产品中心左侧分类 ==================== */
.category-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 30px;
}
.category-sidebar {
  background: #fff;
  border-radius: 6px;
  border: 1px solid var(--border);
  overflow: hidden;
  height: fit-content;
  position: sticky;
  top: 90px;
}
.category-sidebar h3 {
  padding: 16px 20px;
  background: var(--dark-bg);
  color: #fff;
  font-size: 14px;
  margin: 0;
  font-weight: 600;
  letter-spacing: 1px;
}
.category-sidebar ul {
  padding: 8px 0;
}
.category-sidebar ul li a {
  display: block;
  padding: 12px 22px;
  font-size: 14px;
  color: #666;
  border-left: 3px solid transparent;
  transition: all 0.2s;
  cursor: pointer;
}
.category-sidebar ul li a:hover {
  background: var(--bg-light);
  color: var(--primary);
}
.category-sidebar ul li a.active {
  background: #eaf2f8;
  color: var(--primary);
  border-left-color: var(--primary);
  font-weight: 600;
}

/* ==================== 产品详情页 ==================== */
.product-detail-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.product-gallery {
  position: sticky;
  top: 90px;
}
.product-main-image {
  width: 100%;
  aspect-ratio: 1;
  background: #fafafa;
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 12px;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
}
.product-main-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.product-category-tag {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 12px;
}

/* 详情轮播 */
.detail-carousel {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.detail-carousel .detail-main-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.detail-carousel .carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(0,0,0,0.35);
  color: #fff;
  border: none;
  cursor: pointer;
  font-size: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
  z-index: 2;
}
.detail-carousel .carousel-btn:hover { background: rgba(0,0,0,0.6); }
.detail-carousel .carousel-btn.prev { left: 10px; }
.detail-carousel .carousel-btn.next { right: 10px; }

/* 缩略图 */
.detail-thumbnails {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.detail-thumbnails .thumb {
  width: 64px;
  height: 64px;
  border-radius: 6px;
  overflow: hidden;
  border: 2px solid transparent;
  background: #f5f5f5;
  cursor: pointer;
  transition: all 0.2s;
}
.detail-thumbnails .thumb img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.detail-thumbnails .thumb:hover { border-color: var(--primary-light); }
.detail-thumbnails .thumb.active {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(26,82,118,0.2);
}

/* 规格表格 */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.spec-table thead { background: var(--primary); color: #fff; }
.spec-table th,
.spec-table td {
  padding: 12px 15px;
  text-align: center;
  border: 1px solid var(--border);
}
.spec-table tbody tr:hover { background: #f0f7fb; }

/* 产品用途卡片 */
.applications-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 25px;
}
.application-card {
  background: #fff;
  border-radius: 8px;
  padding: 25px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.05);
  border: 1px solid var(--border);
  transition: all 0.25s;
}
.application-card:hover {
  border-color: var(--primary);
  box-shadow: 0 6px 20px rgba(26,82,118,0.1);
  transform: translateY(-3px);
}
.application-card h4 {
  font-size: 16px;
  color: var(--primary);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.application-card p {
  color: #666;
  line-height: 1.8;
  font-size: 13px;
  margin-bottom: 16px;
}
.application-images {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
}
.application-images img {
  width: 100%;
  height: auto;
  max-height: 220px;
  object-fit: cover;
  border-radius: 6px;
  cursor: pointer;
  transition: transform 0.3s, box-shadow 0.3s;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}
.application-images img:hover {
  transform: scale(1.03);
  box-shadow: 0 4px 15px rgba(0,0,0,0.18);
}

/* ==================== 获取报价弹框 ==================== */
.quote-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 99998;
}
.quote-modal.active { display: block; }
.quote-modal .qm-mask {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.55);
  animation: qmFadeIn 0.2s;
}
.quote-modal .qm-body {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: #fff;
  border-radius: 14px;
  padding: 32px 30px 24px;
  text-align: center;
  box-shadow: 0 25px 70px rgba(0,0,0,0.3);
  animation: qmZoomIn 0.25s;
  width: 90%;
  max-width: 420px;
  box-sizing: border-box;
}
.quote-modal .qm-close {
  position: absolute;
  top: 12px;
  right: 16px;
  font-size: 26px;
  color: #999;
  cursor: pointer;
  line-height: 1;
  transition: color 0.2s;
}
.quote-modal .qm-close:hover { color: #333; }
.quote-modal .qm-icon {
  font-size: 36px;
  margin-bottom: 8px;
}
.quote-modal .qm-title {
  font-size: 22px;
  color: #222;
  font-weight: 700;
  margin: 0 0 6px;
  letter-spacing: 1px;
}
.quote-modal .qm-subtitle {
  font-size: 13px;
  color: #999;
  margin-bottom: 22px;
}
.quote-modal .qm-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}
.quote-modal .qm-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  background: #f5f6f7;
  border-radius: 10px;
  text-decoration: none;
  color: inherit;
  transition: background 0.2s, transform 0.2s;
  text-align: left;
}
.quote-modal .qm-item:hover {
  background: #e8ebee;
  transform: translateY(-2px);
}
.quote-modal .qm-item-icon {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 16px;
  flex-shrink: 0;
}
.quote-modal .qm-icon-phone  { background: #e74c3c; }
.quote-modal .qm-icon-email  { background: #95a5a6; }
.quote-modal .qm-icon-kefu   { background: #3498db; }
.quote-modal .qm-icon-wechat { background: #27ae60; }
.quote-modal .qm-item-content {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.quote-modal .qm-item-label {
  font-size: 12px;
  color: #999;
}
.quote-modal .qm-item-value {
  font-size: 15px;
  color: #222;
  font-weight: 500;
}
.quote-modal .qm-item-value.qm-link {
  color: var(--primary);
  font-weight: 600;
}
.quote-modal .qm-btn-close {
  padding: 9px 28px;
  background: #6c757d;
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.2s;
}
.quote-modal .qm-btn-close:hover { background: #5a6268; }

@keyframes qmFadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes qmZoomIn {
  from { opacity: 0; transform: translate(-50%, -50%) scale(0.85); }
  to   { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}

/* ==================== 微信二维码弹框 ==================== */
.wechat-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 99999;
}
.wechat-modal.active { display: block; }
.wechat-modal .wm-mask {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.6);
  animation: wmFadeIn 0.2s;
}
.wechat-modal .wm-body {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: #fff;
  border-radius: 12px;
  padding: 30px 40px 25px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
  animation: wmZoomIn 0.25s;
  max-width: 90vw;
}
.wechat-modal .wm-close {
  position: absolute;
  top: 10px;
  right: 14px;
  font-size: 26px;
  color: #999;
  cursor: pointer;
  line-height: 1;
  transition: color 0.2s;
}
.wechat-modal .wm-close:hover { color: #333; }
.wechat-modal .wm-title {
  font-size: 16px;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 18px;
}
.wechat-modal .wm-qr {
  width: 220px;
  height: 220px;
  object-fit: contain;
  border-radius: 8px;
  background: #f5f5f5;
  padding: 8px;
  display: block;
  margin: 0 auto 15px;
}
.wechat-modal .wm-tip {
  font-size: 13px;
  color: #888;
  line-height: 1.7;
}
.wechat-modal .wm-tip strong { color: var(--primary); }

@keyframes wmFadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes wmZoomIn {
  from { opacity: 0; transform: translate(-50%, -50%) scale(0.85); }
  to   { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}

/* ==================== 响应式 - 平板 ==================== */
@media (max-width: 992px) {
  .product-grid-dark { grid-template-columns: repeat(3, 1fr); }
  .footer-dark-grid { grid-template-columns: 1fr 1fr; }
  .applications-grid { grid-template-columns: 1fr; }
}

/* ==================== 响应式 - 手机 ==================== */
@media (max-width: 768px) {
  /* 顶部导航 */
  .header-dark-inner {
    flex-wrap: wrap;
    height: auto;
    padding: 14px 0;
    gap: 0;
  }
  .logo-dark {
    font-size: 15px;
    flex: 1;
    gap: 8px;
  }
  .logo-dark span:first-child {
    font-size: 20px !important;
  }
  .logo-dark span:last-child {
    font-size: 18px !important;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 55vw;
  }
  .mobile-toggle { display: flex; }
  .header-collapse {
    display: none;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    gap: 0;
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid rgba(255,255,255,0.1);
  }
  .header-collapse.open {
    display: flex;
    animation: slideDown 0.25s ease;
  }
  @keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to   { opacity: 1; transform: translateY(0); }
  }
  .nav-dark { width: 100%; }
  .nav-dark ul {
    flex-direction: column;
    gap: 0;
    width: 100%;
  }
  .nav-dark ul li {
    width: 100%;
    border-bottom: 1px solid rgba(255,255,255,0.06);
  }
  .nav-dark ul li a {
    padding: 14px 4px;
    font-size: 15px;
    border-radius: 0;
    color: var(--dark-text);
  }
  .nav-dark ul li a:hover,
  .nav-dark ul li a.active {
    background: rgba(255,255,255,0.05);
    color: #fff;
    padding-left: 12px;
  }
  .search-box {
    width: 100%;
    margin-top: 14px;
  }
  .search-box input {
    flex: 1;
    width: auto;
    padding: 12px 14px;
    font-size: 15px;
  }
  .search-box button {
    padding: 0 22px;
    font-size: 14px;
  }

  /* Banner */
  .banner-slider { height: 320px; }
  .banner-slide .banner-content h2 { font-size: 22px; margin-bottom: 14px; }
  .banner-slide .banner-content p { font-size: 13px; margin-bottom: 20px; }
  .banner-slide .banner-content .btn { padding: 10px 24px; font-size: 14px; }
  .banner-arrow { width: 34px; height: 34px; font-size: 13px; }
  .banner-arrow.prev { left: 8px; }
  .banner-arrow.next { right: 8px; }
  .banner-dots { bottom: 14px; gap: 8px; }
  .banner-dots .dot { width: 8px; height: 8px; }
  .banner-dots .dot.active { width: 20px; }

  /* 产品卡片 */
  .product-grid-dark {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  .product-card-dark .pc-body { padding: 10px 12px 12px; }
  .product-card-dark .pc-body h4 { font-size: 13px; min-height: 36px; margin-bottom: 6px; }
  .product-card-dark .pc-features { font-size: 11px; min-height: 32px; margin-bottom: 8px; }
  .product-card-dark .pc-btn { font-size: 12px; padding: 5px 10px; }
  .product-card-dark .pc-img { padding: 10px; }

  /* 分类侧栏 */
  .category-layout {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .category-sidebar {
    position: static;
    padding: 0;
  }
  .category-sidebar h3 {
    padding: 12px 16px;
    font-size: 13px;
  }
  .category-sidebar ul {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 12px;
  }
  .category-sidebar ul li {
    flex: 1 0 calc(50% - 8px);
  }
  .category-sidebar ul li a {
    display: block;
    padding: 10px 12px;
    text-align: center;
    font-size: 13px;
    border-radius: 4px;
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-left: none;
  }
  .category-sidebar ul li a.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
  }

  /* 详情页 */
  .product-detail-wrapper {
    grid-template-columns: 1fr;
    gap: 25px;
  }
  .product-gallery { position: static; }
  .applications-grid { grid-template-columns: 1fr; gap: 18px; }
  .application-card { padding: 20px; }
  .spec-table th,
  .spec-table td { padding: 9px 10px; font-size: 12px; }
  .detail-thumbnails .thumb { width: 54px; height: 54px; }
  #productName { font-size: 20px !important; }
  .quote-btn-full { font-size: 16px; padding: 14px 18px; }

  /* 页脚 */
  .footer-dark { padding: 35px 0 15px; }
  .footer-dark-grid {
    grid-template-columns: 1fr !important;
    gap: 25px;
    margin-bottom: 20px;
  }
  .footer-dark-grid h3 { font-size: 15px; }
  .footer-dark-grid h4 { font-size: 14px; }
  .footer-dark-grid p,
  .footer-dark-grid ul li a { font-size: 13px; }
  .footer-dark-grid > div:last-child { text-align: left !important; }

  /* 悬浮按钮 */
  .float-service-dark {
    top: auto;
    bottom: 18px;
    right: 12px;
    transform: none;
    gap: 6px;
  }
  .float-item {
    width: 40px;
    height: 40px;
    font-size: 15px;
  }

  /* 报价弹框 */
  .quote-modal .qm-body { padding: 26px 22px 20px; }
  .quote-modal .qm-title { font-size: 19px; }
  .quote-modal .qm-icon { font-size: 30px; }
  .quote-modal .qm-item { padding: 12px 14px; }
  .quote-modal .qm-item-icon { width: 34px; height: 34px; font-size: 14px; }
  .quote-modal .qm-item-value { font-size: 14px; }

  /* 微信弹框 */
  .wechat-modal .wm-body { padding: 25px 25px 20px; }
  .wechat-modal .wm-qr { width: 180px; height: 180px; }
}
/* ==================== 关于我们 - 公司简介 ==================== */
.about-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}
.about-text h3 {
  font-size: 24px;
  color: var(--primary);
  margin-bottom: 20px;
}
.about-text p {
  color: #666;
  line-height: 2;
  margin-bottom: 15px;
  font-size: 14px;
}
.about-image {
  background: #f5f6f7;
  border-radius: 8px;
  padding: 20px;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 320px;
  overflow: hidden;
}
.about-image img {
  width: 100%;
  height: auto;
  max-height: 480px;
  object-fit: cover;
  border-radius: 6px;
  display: block;
}
.about-image.no-image {
  padding: 60px;
}
.about-image.no-image i {
  display: block !important;
  font-size: 80px;
  color: var(--primary);
  opacity: 0.3;
}

/* ==================== 手机端：文字在上，图片在下 ==================== */
@media (max-width: 768px) {
  .about-intro {
    grid-template-columns: 1fr;
    gap: 25px;
  }
  .about-text h3 {
    font-size: 20px;
    margin-bottom: 15px;
  }
  .about-text p {
    font-size: 14px;
    line-height: 1.9;
    margin-bottom: 12px;
  }
  .about-image {
    min-height: auto;
    padding: 12px;
  }
  .about-image img {
    max-height: none;
    border-radius: 6px;
  }
}
/* ==================== 解决方案页 ==================== */
.solution-list {
  display: flex;
  flex-direction: column;
  gap: 60px;
}

.solution-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
  background: #fff;
  border-radius: 12px;
  overflow: hidden;
  transition: all 0.3s;
}

.solution-item.reverse {
  direction: rtl;
}
.solution-item.reverse > * {
  direction: ltr;
}

.solution-img {
  width: 100%;
  aspect-ratio: 4 / 3;
  background: #f5f6f7;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-radius: 12px;
}
.solution-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.solution-item:hover .solution-img img {
  transform: scale(1.05);
}

.solution-content {
  padding: 20px 0;
}
.solution-content h3 {
  font-size: 24px;
  color: #1a5276;
  margin-bottom: 14px;
  font-weight: 700;
  line-height: 1.4;
}
.solution-line {
  width: 50px;
  height: 3px;
  background: #1a5276;
  margin-bottom: 20px;
  border-radius: 2px;
}
.solution-content p {
  color: #666;
  line-height: 1.9;
  font-size: 14px;
  margin-bottom: 25px;
  display: -webkit-box;
  -webkit-line-clamp: 5;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.solution-btn {
  display: inline-block;
  padding: 11px 30px;
  border: 1px solid #1a5276;
  color: #1a5276;
  border-radius: 4px;
  font-size: 14px;
  transition: all 0.25s;
}
.solution-btn:hover {
  background: #1a5276;
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(26,82,118,0.2);
}

/* ==================== 手机端：上下堆叠 ==================== */
@media (max-width: 768px) {
  .solution-list { gap: 35px; }

  .solution-item,
  .solution-item.reverse {
    grid-template-columns: 1fr;
    gap: 20px;
    direction: ltr;
  }

  .solution-img {
    aspect-ratio: 16 / 10;
    border-radius: 8px;
  }
  .solution-content h3 {
    font-size: 19px;
    margin-bottom: 10px;
  }
  .solution-line {
    width: 40px;
    height: 2px;
    margin-bottom: 15px;
  }
  .solution-content p {
    font-size: 13px;
    line-height: 1.8;
    margin-bottom: 18px;
    -webkit-line-clamp: 4;
  }
  .solution-btn {
    padding: 9px 22px;
    font-size: 13px;
  }
}