/* ===================== 全局变量 统一配色 ===================== */
:root {
  --gold-main: #D4AF37;
  --gold-dark: #b89628;
  --pure-black: #000000;
  --pure-white: #ffffff;
  --gray-bg-light: #f9f9f9;
  --gray-border: #e0e0e0;
  --gray-text-dark: #666666;
  --gray-text-deep: #333333;
  --footer-bg: #191919;
  --base-transition: all 0.3s ease;
}

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

body {
  font-family: 'Inter', Arial, Helvetica, sans-serif;
  color: var(--pure-black);
  line-height: 1.6;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

ul, ol {
  list-style: none;
}
a {
  text-decoration: none;
}
button {
  cursor: pointer;
  border: none;
  background: transparent;
}
img {
  display: block;
  max-width: 100%;
}




/* ===================== 顶部导航 Header ===================== 
.header {
  background-color: var(--pure-white);
  padding: 20px 0;
  border-bottom: 1px solid var(--gray-border);
  position: relative;
  z-index: 99;
}
.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

* Logo *
.logo {
  display: flex;
  align-items: center;
}
.logo-img {
  width: 120px;
}
.logo-text {
  font-size: 12px;
  text-transform: uppercase;
  color: var(--gray-text-dark);
  margin-left: 10px;
}

* 桌面导航 *
.nav-desktop .nav-list {
  display: flex;
  align-items: center;
  gap: 25px;
}
.nav-link {
  font-size: 14px;
  font-weight: 500;
  text-transform: uppercase;
  color: var(--pure-black);
  transition: var(--base-transition);
}
.nav-link:hover {
  color: var(--gold-main);
}
.search-btn {
  font-size: 16px;
}
.quote-btn {
  background-color: var(--gold-main);
  color: var(--pure-black) !important;
  padding: 8px 18px;
  font-weight: 600;
}
.quote-btn:hover {
  background-color: var(--gold-dark);
}

* 移动端汉堡按钮 *
.hamburger {
  display: none;
  font-size: 24px;
}

* 移动端导航菜单 *
.nav-mobile {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  background: var(--pure-white);
  padding: 25px 20px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
.nav-mobile.active {
  display: block;
}
.nav-mobile-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.nav-mobile-link {
  font-size: 14px;
  text-transform: uppercase;
  color: var(--pure-black);
  font-weight: 500;
}
*/






/* ===================== 面包屑导航 ===================== */
.breadcrumb-section {
  background-color: var(--gray-bg-light);
  padding: 16px 0;
  border-bottom: 1px solid var(--gray-border);
}
.breadcrumb-links {
  font-size: 14px;
  color: var(--gray-text-dark);
}
.breadcrumb-links a {
  color: var(--gray-text-dark);
  transition: var(--base-transition);
}
.breadcrumb-links a:hover {
  color: var(--gold-main);
}
.breadcrumb-links span {
  color: var(--pure-black);
  font-weight: 500;
}

/* ===================== 产品头部Banner ===================== */
.product-hero {

   background-image: url("../images/banner.jpg");
    background-repeat: no-repeat;    /* 不重复 */
    background-size: cover;          /* 铺满整个容器 */
    background-position: center;     /* 图片居中 */

    
  position: relative;
  height: 300px;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 1;
}
.hero-bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero-content {
  position: absolute;
  inset: 0;
  z-index: 2;
  background-color: rgba(0,0,0,0.4);
  display: flex;
  align-items: center;
}
.product-title {
  font-size: 48px;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--pure-white);
  letter-spacing: 1px;
}

/* ===================== 产品主信息区域（图库+参数） ===================== */
.product-main-info {
  padding: 60px 0;
}
.product-info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

/* 左侧产品图库 */
.product-gallery {
  width: 100%;
}
.main-product-img {
  position: relative;
  width: 100%;
  height: 450px;
  border: 1px solid var(--gray-border);
  margin-bottom: 20px;
  overflow: hidden;
}
.main-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.main-product-img:hover .main-img {
  transform: scale(1.05);
}
.zoom-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255,255,255,0.8);
  font-size: 16px;
  color: var(--pure-black);
  transition: var(--base-transition);
}
.zoom-btn:hover {
  background-color: var(--gold-main);
}

/* 缩略图导航栏 */
.thumbnail-nav {
  display: flex;
  align-items: center;
  gap: 15px;
}
.thumb-nav-btn {
  width: 35px;
  height: 35px;
  border: 1px solid var(--gray-border);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--base-transition);
}
.thumb-nav-btn:hover {
  background: var(--gold-main);
  border-color: var(--gold-main);
}
.thumbnails {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  flex: 1;
  padding: 5px 0;
}
.thumbnails::-webkit-scrollbar {
  height: 4px;
}
.thumbnails::-webkit-scrollbar-thumb {
  background: var(--gold-main);
}
.thumbnail-item {
  width: 100px;
  height: 80px;
  border: 2px solid transparent;
  flex-shrink: 0;
  transition: var(--base-transition);
}
.thumbnail-item.active {
  border-color: var(--gold-main);
}
.thumbnail-item:hover {
  opacity: 0.8;
}
.thumb-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 右侧产品参数详情 */
.product-details {
  padding-left: 20px;
}
.product-subtitle {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 10px;
}
.product-material {
  font-size: 16px;
  color: var(--gray-text-dark);
  font-style: italic;
  margin-bottom: 20px;
}
.product-description {
  font-size: 16px;
  line-height: 1.8;
  color: var(--gray-text-deep);
  margin-bottom: 30px;
}

/* 五大特性图标行 */
.product-features {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 15px;
  margin-bottom: 40px;
}
.feature-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  flex: 1;
  min-width: 70px;
}
.feature-icon {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: var(--gold-main);
  color: var(--pure-black);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  margin-bottom: 10px;
}
.feature-text {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  line-height: 1.4;
}

/* 产品基础参数表格 */
.product-specs-table {
  border-top: 1px solid var(--gray-border);
  border-bottom: 1px solid var(--gray-border);
  padding: 20px 0;
  margin-bottom: 30px;
}
.spec-row {
  display: flex;
  padding: 10px 0;
  border-bottom: 1px solid var(--gray-border);
}
.spec-row:last-child {
  border-bottom: none;
}
.spec-label {
  width: 30%;
  font-size: 14px;
  font-weight: 600;
}
.spec-value {
  width: 70%;
  font-size: 14px;
  color: var(--gray-text-deep);
}

/* 操作按钮：报价 / 下载规格 */
.product-actions {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}
.btn {
  padding: 12px 25px;
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: var(--base-transition);
}
.primary-btn {
  background-color: var(--gold-main);
  color: var(--pure-black) !important;
}
.primary-btn:hover {
  background-color: var(--gold-dark);
}
.secondary-btn {
  border: 1px solid var(--pure-black);
  color: var(--pure-black) !important;
  background: transparent;
}
.secondary-btn:hover {
  background-color: var(--pure-black);
  color: var(--pure-white) !important;
}

/* ===================== 产品Tab标签区域 ===================== */
.product-tabs-section {
  background-color: var(--gray-bg-light);
  padding: 40px 0 60px;
}
.product-tabs-nav {
  display: flex;
  border-bottom: 2px solid var(--pure-black);
  margin-bottom: 30px;
}
.tab-btn {
  padding: 15px 25px;
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  position: relative;
  transition: var(--base-transition);
}
.tab-btn.active {
  color: var(--gold-main);
}
.tab-btn.active::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--gold-main);
}
.tab-btn:hover {
  color: var(--gold-main);
}

/* Tab内容容器 */
.product-tabs-content {
  background-color: var(--pure-white);
  border: 1px solid var(--gray-border);
  padding: 30px;
}
.tab-content {
  display: none;
}
.tab-content.active {
  display: block;
  animation: fadeTab 0.5s ease forwards;
}
@keyframes fadeTab {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Tab1 Description 描述内容 */
.description-text {
  font-size: 16px;
  line-height: 1.8;
  margin-bottom: 20px;
}
.advantages-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  font-size: 16px;
}
.advantages-list i {
  color: var(--gold-main);
}

/* Tab2 Specifications 规格总表 */
.specs-table-container {
  overflow-x: auto;
}
.specs-table {
  width: 100%;
  border-collapse: collapse;
}
.specs-table th,
.specs-table td {
  padding: 12px 15px;
  text-align: left;
  border-bottom: 1px solid var(--gray-border);
  font-size: 14px;
}
.specs-table th {
  background-color: var(--gray-bg-light);
  text-transform: uppercase;
  font-weight: 700;
}
.specs-table td {
  color: var(--gray-text-deep);
}

/* Tab3 Advantages 优势卡片网格 */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.advantage-card {
  background-color: var(--gray-bg-light);
  padding: 20px;
  text-align: center;
  transition: var(--base-transition);
}
.advantage-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.05);
}
.advantage-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background-color: var(--gold-main);
  color: var(--pure-black);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin: 0 auto 15px;
}
.advantage-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}
.advantage-desc {
  font-size: 14px;
  color: var(--gray-text-deep);
  line-height: 1.6;
}

/* Tab4 Applications 应用场景 */
.applications-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.application-card {
  border: 1px solid var(--gray-border);
  overflow: hidden;
  transition: var(--base-transition);
}
.application-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.05);
}
.application-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.application-card:hover .application-img {
  transform: scale(1.05);
}
.application-title {
  font-size: 18px;
  font-weight: 700;
  padding: 15px 20px 5px;
}
.application-desc {
  font-size: 14px;
  color: var(--gray-text-deep);
  padding: 0 20px 20px;
  line-height: 1.6;
}

/* Tab5 Installation 安装步骤 */
.installation-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 20px;
}
.installation-steps {
  counter-reset: stepNum;
}
.installation-steps li {
  position: relative;
  padding-left: 60px;
  margin-bottom: 20px;
  counter-increment: stepNum;
}
.installation-steps li::before {
  content: counter(stepNum);
  position: absolute;
  left: 0;
  top: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--gold-main);
  color: var(--pure-black);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}
.installation-steps h4 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}
.installation-steps p {
  font-size: 16px;
  color: var(--gray-text-deep);
}
.installation-note {
  background-color: var(--gray-bg-light);
  border-left: 3px solid var(--gold-main);
  padding: 15px 20px;
  margin-top: 20px;
  font-size: 14px;
}

/* Tab6 Downloads 下载文件列表 */
.downloads-list {
  display: flex;
  flex-direction: column;
  gap: 15px;
}
.download-item {
  display: flex;
  align-items: center;
  border: 1px solid var(--gray-border);
  padding: 15px;
  transition: var(--base-transition);
}
.download-item:hover {
  background-color: var(--gray-bg-light);
}
.download-icon {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: var(--gold-main);
  color: var(--pure-black);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  margin-right: 20px;
  flex-shrink: 0;
}
.download-info {
  flex: 1;
}
.download-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 5px;
}
.download-desc {
  font-size: 14px;
  color: var(--gray-text-deep);
}
.download-btn {
  background-color: var(--pure-black);
  color: var(--pure-white) !important;
  padding: 8px 15px;
  font-size: 14px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: var(--base-transition);
}
.download-btn:hover {
  background-color: var(--gold-main);
  color: var(--pure-black) !important;
}

/* ===================== 相关产品推荐区域 ===================== */
.related-products {
  padding: 60px 0;
}
.section-heading {
  font-size: 24px;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 40px;
  position: relative;
  padding-bottom: 10px;
}
.section-heading::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 50px;
  height: 3px;
  background-color: var(--gold-main);
}

/* 横向产品滑块容器 */
.related-products-slider {
  display: flex;
  align-items: center;
  position: relative;
}
.slider-btn {
  width: 40px;
  height: 40px;
  border: 1px solid var(--gray-border);
  background: var(--pure-white);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
  transition: var(--base-transition);
}
.slider-btn:hover {
  background-color: var(--gold-main);
  border-color: var(--gold-main);
}
.products-slider {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  scroll-behavior: smooth;
  padding: 10px 20px;
  flex: 1;
}
.products-slider::-webkit-scrollbar {
  height: 4px;
}
.products-slider::-webkit-scrollbar-thumb {
  background: var(--gold-main);
}

/* 单个相关产品卡片 */
.related-product-card {
  min-width: 200px;
  background-color: var(--pure-white);
  border: 1px solid var(--gray-border);
  transition: var(--base-transition);
}
.related-product-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 8px 18px rgba(0,0,0,0.08);
}
.product-card-img {
  width: 100%;
  height: 150px;
  overflow: hidden;
}
.card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.related-product-card:hover .card-img {
  transform: scale(1.06);
}
.product-card-title {
  font-size: 16px;
  font-weight: 700;
  padding: 15px 15px 5px;
}
.product-card-spec {
  font-size: 13px;
  color: var(--gray-text-dark);
  padding: 0 15px 12px;
  line-height: 1.5;
}
.product-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--gold-main);
  padding: 0 15px 18px;
  transition: var(--base-transition);
}
.product-card-link:hover {
  color: var(--pure-black);
}

/* ===================== 底部定制咨询CTA横幅 ===================== */
.custom-solutions-cta {
  position: relative;
  height: 300px;
  overflow: hidden;
}
.cta-bg {
  position: absolute;
  inset: 0;
  z-index: 1;
}
.cta-bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.cta-content {
  position: absolute;
  inset: 0;
  z-index: 2;
  background-color: rgba(0,0,0,0.55);
  display: flex;
  align-items: center;
}
.cta-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--pure-white);
  margin-bottom: 12px;
}
.cta-desc {
  font-size: 16px;
  color: #dddddd;
  max-width: 700px;
  margin-bottom: 25px;
  line-height: 1.7;
}
.cta-btn {
  background-color: var(--gold-main);
  color: var(--pure-black) !important;
  padding: 14px 30px;
  font-weight: 600;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: var(--base-transition);
}
.cta-btn:hover {
  background-color: var(--pure-white);
}

/* ===================== 全局页脚 Footer（全站统一） ===================== */
.footer {
  background-color: var(--footer-bg);
  color: var(--pure-white);
  padding: 60px 0 30px;
}
.footer-container {
  display: grid;
  grid-template-columns: 24% 14% 18% 14% 14% 16%;
  gap: 22px;
  margin-bottom: 40px;
}
.brand-col {
  padding-right: 15px;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
}
.footer-logo-img {
  width: 85px;
}
.footer-logo-text {
  font-size: 12px;
  color: #cccccc;
  text-transform: uppercase;
}
.brand-desc {
  font-size: 14px;
  color: #999999;
  line-height: 1.6;
  margin-bottom: 20px;
}
.footer-social-links {
  display: flex;
  gap: 10px;
}
.footer-social-link {
  width: 32px;
  height: 32px;
  background: #333333;
  color: var(--pure-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--base-transition);
}
.footer-social-link:hover {
  background-color: var(--gold-main);
  color: var(--pure-black);
}
.footer-title {
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 20px;
  letter-spacing: 0.4px;
}
.footer-links li {
  margin-bottom: 9px;
}
.footer-links a {
  color: #999999;
  font-size: 14px;
  transition: var(--base-transition);
}
.footer-links a:hover {
  color: var(--gold-main);
}
.contact-info-links li {
  display: flex;
  gap: 10px;
  font-size: 14px;
  color: #999999;
  margin-bottom: 10px;
  line-height: 1.5;
}
.contact-info-links i {
  color: var(--gold-main);
  margin-top: 3px;
}
.footer-bottom {
  border-top: 1px solid #333333;
  padding-top: 25px;
}
.footer-bottom-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.copyright {
  font-size: 13px;
  color: #999999;
}
.footer-bottom-links a {
  color: #999999;
  font-size: 13px;
  margin: 0 6px;
  transition: var(--base-transition);
}
.footer-bottom-links a:hover {
  color: var(--gold-main);
}

/* ===================== 响应式媒体查询 分层适配 ===================== */
/* 1200px以下平板大屏 */
@media (max-width: 1200px) {
  .product-info-grid {
    grid-template-columns: 1fr;
    gap: 50px;
  }
  .product-details {
    padding-left: 0;
  }
  .footer-container {
    grid-template-columns: 30% 20% 20% 30%;
  }
  .footer-col:nth-child(5),
  .footer-col:nth-child(6) {
    grid-column: span 2;
    margin-top: 20px;
  }
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 992px以下平板 */
@media (max-width: 992px) {
  .nav-desktop {
    display: none;
  }
  .hamburger {
    display: block;
  }
  .product-title {
    font-size: 38px;
  }
  .product-subtitle {
    font-size: 24px;
  }
  .applications-grid {
    grid-template-columns: 1fr;
  }
  .custom-solutions-cta {
    height: 260px;
  }
  .cta-title {
    font-size: 28px;
  }
}

/* 768px以下手机横屏 */
@media (max-width: 768px) {
  .product-hero {
    height: 220px;
  }
  .product-title {
    font-size: 30px;
  }
  .product-features {
    gap: 25px;
  }
  .feature-item {
    min-width: 110px;
  }
  .product-actions {
    flex-direction: column;
  }
  .btn {
    width: 100%;
    justify-content: center;
  }
  .product-tabs-nav {
    flex-wrap: wrap;
  }
  .tab-btn {
    padding: 12px 16px;
    font-size: 13px;
  }
  .advantages-grid {
    grid-template-columns: 1fr;
  }
  .footer-container {
    grid-template-columns: 1fr 1fr;
  }
  .brand-col {
    grid-column: span 2;
    margin-bottom: 20px;
  }
  .footer-bottom-container {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

/* 480px以下手机竖屏 */
@media (max-width: 480px) {
  .main-product-img {
    height: 300px;
  }
  .thumbnail-item {
    width: 75px;
    height: 60px;
  }
  .product-tabs-content {
    padding: 20px 15px;
  }
  .download-item {
    flex-direction: column;
    gap: 15px;
    text-align: center;
  }
  .download-icon {
    margin: 0 auto;
  }
  .custom-solutions-cta {
    height: 220px;
  }
  .cta-title {
    font-size: 24px;
  }
  .section-heading {
    font-size: 20px;
  }
}