/* 简约科技蓝 全站核心样式 - 极致扁平直角版 */
:root {
  --tech-blue: #0056b3;
  --tech-blue-deep: #004494;
  --tech-blue-light: #e6f0f9;
  --bg-light: #ffffff;
  --bg-soft: #f4f7fa;
  --border-color: #e1e8f0;
  --matte-black: #161c2d;
  --deep-charcoal: #0b0f19;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --text-dim: #94a3b8;
  --site-max-width: 1280px;
  --header-h: 80px;
  --topbar-h: 40px;
}

/* --- 基础设置 (强制直角) --- */
* {
  border-radius: 0 !important;
  margin: 0;
  padding: 0;
}

body {
  margin: 0;
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text-main);
  background-color: var(--bg-light);
  -webkit-tap-highlight-color: transparent;
  line-height: 1.5;
}

a {
  text-decoration: none;
  transition: all 0.2s ease;
  color: inherit;
  outline: none;
}

ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.container {
  width: 92%;
  max-width: var(--site-max-width);
  margin: 0 auto;
}

/* --- 顶部咨询条 --- */
.top-bar {
  background: var(--bg-soft);
  border-bottom: 1px solid var(--border-color);
  height: var(--topbar-h);
  font-size: 13px;
  color: var(--text-muted);
  z-index: 1001;
  position: fixed;
  top: 0;
  width: 100%;
  display: flex;
  align-items: center;
}

.top-container {
  max-width: var(--site-max-width);
  width: 92%;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.top-left {
  position: relative;
  display: flex;
  align-items: center;
  height: 100%;
}

.top-left i {
  color: var(--tech-blue);
  margin-right: 6px;
}

.top-left b {
  color: var(--text-main);
  font-weight: 600;
}

.top-left .change-city {
  margin-left: 10px;
  color: var(--tech-blue);
  font-size: 11px;
  background: var(--tech-blue-light);
  padding: 2px 8px;
  border: 1px solid var(--tech-blue);
}

.top-left .change-city:hover {
  background: var(--tech-blue);
  color: #fff;
}

.city-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  width: 450px;
  background: #fff;
  border: 1px solid var(--border-color);
  border-top: 3px solid var(--tech-blue);
  padding: 25px;
  z-index: 1002;
  display: none;
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
}

.top-left:hover .city-dropdown {
  display: block;
}

.city-dropdown h5 {
  font-size: 14px;
  margin-bottom: 15px;
  color: var(--text-main);
  border-bottom: 1px solid var(--bg-soft);
  padding-bottom: 10px;
  font-weight: 700;
}

.city-list-wrapper {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
}

.city-list-wrapper a {
  font-size: 12px;
  color: var(--text-muted);
  padding: 6px;
  text-align: center;
  border: 1px solid transparent;
}

.city-list-wrapper a:hover {
  color: var(--tech-blue);
  background: var(--tech-blue-light);
  border-color: var(--tech-blue);
}

.top-right {
  display: flex;
  gap: 25px;
}

.contact-item {
  display: flex;
  align-items: center;
}

.contact-item i {
  color: var(--tech-blue);
  margin-right: 6px;
}

.contact-item a:hover {
  color: var(--tech-blue);
}

/* --- 主导航栏 --- */
.header-nav {
  position: fixed;
  top: var(--topbar-h);
  left: 0;
  width: 100%;
  height: var(--header-h);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.nav-container {
  max-width: var(--site-max-width);
  width: 92%;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

.logo img {
  height: 50px;
  vertical-align: middle;
}

.logo a {
  display: flex;
  justify-content: center;
  align-items: center;
  column-gap: 15px;
}

.pc-menu {
  display: flex;
  height: 100%;
}

.nav-item {
  position: relative;
  height: 100%;
}

.nav-link {
  display: flex;
  align-items: center;
  padding: 0 25px;
  height: 100%;
  color: var(--text-main);
  font-size: 16px;
  font-weight: 500;
  position: relative;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: var(--tech-blue);
  transition: 0.3s;
}

.nav-item:hover .nav-link,
.nav-item.active .nav-link {
  color: var(--tech-blue);
  background: var(--tech-blue-light);
}

.nav-item:hover .nav-link::after,
.nav-item.active .nav-link::after {
  width: 100%;
}

.dropdown {
  position: absolute;
  top: var(--header-h);
  left: 0;
  background: #fff;
  min-width: 190px;
  border: 1px solid var(--border-color);
  border-top: 3px solid var(--tech-blue);
  display: none;
  flex-direction: column;
  padding: 5px 0;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.dropdown a {
  padding: 12px 25px;
  color: var(--text-muted);
  font-size: 14px;
  border-bottom: 1px solid var(--bg-soft);
}

.dropdown a:last-child {
  border-bottom: none;
}

.dropdown a:hover {
  background: var(--tech-blue);
  color: #fff;
  padding-left: 30px;
}

.nav-item:hover .dropdown {
  display: flex;
}

/* --- 移动端导航 --- */
.mobile-toggle {
  display: none;
  font-size: 24px;
  color: var(--tech-blue);
  cursor: pointer;
  padding: 10px;
}

.nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: none;
  z-index: 1999;
}

.mobile-nav {
  position: fixed;
  top: 0;
  left: -100%;
  width: 80%;
  height: 100%;
  background: #fff;
  z-index: 2000;
  transition: 0.4s;
  overflow-y: auto;
}

.mobile-nav.open {
  left: 0;
}

.m-nav-item {
  border-bottom: 1px solid var(--bg-soft);
}

.m-nav-link {
  display: flex;
  justify-content: space-between;
  padding: 18px 20px;
  color: var(--text-main);
  font-weight: 600;
}

.m-sub-menu {
  background: var(--bg-soft);
  display: none;
}

.m-sub-menu a {
  display: block;
  padding: 14px 40px;
  color: var(--text-muted);
  font-size: 14px;
}

.header-placeholder {
  height: 120px;
}

/* --- 高级 Section Header 系统 --- */
.section-header {
  position: relative;
  margin-bottom: 40px;
  z-index: 1;
}

/* 风格1：水印叠层居中 (用于产品、案例) */
.header-watermark {
  text-align: center;
}

.header-watermark .sub-title {
  position: absolute;
  top: -30px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 72px;
  font-weight: 900;
  color: var(--tech-blue);
  opacity: 0.05;
  text-transform: uppercase;
  letter-spacing: 12px;
  white-space: nowrap;
  z-index: -1;
  pointer-events: none;
}

.header-watermark h2 {
  font-size: 34px;
  color: var(--text-main);
  font-weight: 800;
  margin: 0;
  position: relative;
}

.header-watermark h2::after {
  content: "";
  display: block;
  width: 40px;
  height: 3px;
  background: var(--tech-blue);
  margin: 20px auto 0;
}

/* 风格2：左对齐科技感 (用于关于我们) */
.header-left {
  text-align: left;
  display: flex;
  flex-direction: column;
}

.header-left h2 {
  font-size: 32px;
  font-weight: 800;
  margin: 0;
  border-left: 6px solid var(--tech-blue);
  padding-left: 20px;
  line-height: 1.2;
}

.header-left .sub-title {
  font-size: 14px;
  color: var(--tech-blue);
  text-transform: uppercase;
  letter-spacing: 3px;
  font-weight: 700;
  margin-top: 10px;
  padding-left: 26px;
  opacity: 0.4;
}

/* 风格3：极简错位感 (用于资讯) */
.header-minimal {
  display: flex;
  align-items: flex-end;
  gap: 15px;
  margin-bottom: 50px;
}

.header-minimal h2 {
  font-size: 28px;
  font-weight: 800;
  margin: 0;
  color: var(--text-main);
}

.header-minimal .sub-title {
  font-size: 18px;
  font-family: Georgia, serif;
  font-style: italic;
  color: var(--text-dim);
  opacity: 0.3;
  padding-bottom: 4px;
}

/* 风格4：深色背景适配 (用于优势等) */
.header-dark-mode .sub-title {
  color: #fff;
  opacity: 0.03;
}

.header-dark-mode h2 {
  color: #fff;
}

@media (max-width: 768px) {
  .header-watermark .sub-title {
    font-size: 40px;
    top: -10px;
    letter-spacing: 5px;
  }

  .header-left h2 {
    font-size: 26px;
  }
}


.banner-swiper {
  width: 100%;
  height: 600px;
  position: relative;
  overflow: hidden;
}

.banner-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.banner-content {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  /* background: rgba(0, 0, 0, 0.3); */
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.banner-text h1 {
  font-size: 48px;
  font-weight: 800;
  margin-bottom: 20px;
}

.about-section {
  padding: 90px 0;
  background: var(--bg-soft);
}

.about-grid {
  display: flex;
  gap: 50px;
  align-items: center;
}

.about-image {
  flex: 1;
}

.about-image img {
  width: 100%;
  border: 1px solid var(--border-color);
  box-shadow: 15px 15px 0 var(--tech-blue);
}

.about-info {
  flex: 1.2;
}

.btn-more {
  display: inline-block;
  padding: 12px 35px;
  background: var(--tech-blue);
  color: #fff;
  font-weight: 600;
  margin-top: 20px;
  border: none;
}

.btn-more:hover {
  background: var(--tech-blue-deep);
}

.product-section {
  padding: 90px 0;
}

.product-grid-layout {
  display: flex;
  gap: 40px;
}

.product-sidebar {
  width: 260px;
  flex-shrink: 0;
  position: sticky;
  top: 140px;
  height: fit-content;
}

.product-sidebar .header-left {
  padding: 15px 0;
  background: var(--tech-blue);
}

.product-sidebar .header-left h2 {
  color: #fff;
}

.product-sidebar .header-left .sub-title {
  color: #fff;
}

/* 侧边栏热线组件 */
.sidebar-hotline {
  margin-top: 0;
  padding: 25px 20px;
  background: var(--tech-blue);
  color: #fff;
  display: flex;
  align-items: center;
  gap: 15px;
  transition: 0.3s;
}

.sidebar-hotline:hover {
  background: var(--tech-blue-deep);
}

.sidebar-hotline i {
  font-size: 32px;
  opacity: 0.8;
}

.sidebar-hotline .hotline-info {
  flex: 1;
}

.sidebar-hotline .hotline-label {
  display: block;
  font-size: 12px;
  opacity: 0.7;
  margin-bottom: 2px;
  letter-spacing: 1px;
}

.sidebar-hotline .hotline-num {
  display: block;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

@media (max-width: 991px) {
  .sidebar-hotline {
    margin-top: 20px;
  }
}

.product-cat-list {
  background: #fff;
  border-left: 6px solid var(--tech-blue);
  border-right: 6px solid var(--tech-blue);
}

.product-cat-list li a {
  display: block;
  padding: 15px 25px;
  border-bottom: 1px solid var(--border-color);
}

.product-cat-list li.active a,
.product-cat-list li a:hover {
  background: var(--tech-blue);
  color: #fff;
}

.product-main {
  flex: 1;
}

.product-card-grid {
  display: none;
  grid-template-columns: repeat(3, 1fr);
  gap: 25px;
}

.product-card-grid.active {
  display: grid !important;
}

.product-card {
  background: #fff;
  border: 1px solid var(--border-color);
  transition: 0.3s;
}

.product-card:hover {
  transform: translateY(-5px);
  border-color: var(--tech-blue);
}

.product-thumb {
  position: relative;
  padding-bottom: 100%;
  overflow: hidden;
}

.product-thumb img {
  position: absolute;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: 0.5s;
}

.product-card:hover .product-thumb img {
  transform: scale(1.05);
}

.product-body {
  padding: 10px 20px;
  border-top: 1px solid var(--bg-soft);
}

.product-body h4 {
  font-size: 16px;
  color: var(--text-main);
  font-weight: 600;
}

.product-body p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  height: 42px;
  overflow: hidden;
}

/* --- 4. 4大优势 (亮色版) --- */
.advantage-section {
  padding: 90px 0;
  background: var(--bg-soft);
  color: var(--text-main);
}

.adv-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

.adv-item {
  padding: 40px 25px;
  background: #fff;
  border: 1px solid var(--border-color);
  text-align: left;
  position: relative;
  overflow: hidden;
  transition: 0.3s;
}

.adv-item:hover {
  border-color: var(--tech-blue);
  transform: translateY(-5px);
}

.adv-item .adv-deco {
  position: absolute;
  right: -10px;
  bottom: -10px;
  font-size: 40px;
  font-weight: 900;
  color: rgba(0, 86, 179, 0.05);
  text-transform: uppercase;
  z-index: 1;
}

.adv-icon {
  font-size: 32px;
  color: var(--tech-blue);
  margin-bottom: 20px;
  position: relative;
  z-index: 2;
}

.adv-item h3 {
  font-size: 18px;
  margin-bottom: 15px;
  font-weight: 700;
  color: var(--text-main);
  position: relative;
  z-index: 2;
}

.adv-item p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
  position: relative;
  z-index: 2;
  margin: 0;
}
.case-section{
  padding: 80px 0;
}
.case-card img{
  max-width: 100%;
}
/* --- 6. 新闻资讯 (左右拆分布局) --- */
.news-section {
  padding: 90px 0;
}

.news-split-grid {
  display: flex;
  gap: 60px;
}

.news-left {
  flex: 1;
}

/* 企业资质 */
.news-right {
  flex: 1.5;
}

/* 行业资讯 */

.news-split-grid h3 {
  font-size: 20px;
  margin-bottom: 30px;
  font-weight: 700;
  display: flex;
  align-items: center;
}

.news-split-grid h3::before {
  content: "";
  width: 4px;
  height: 18px;
  background: var(--tech-blue);
  margin-right: 12px;
}

/* 企业资质样式 */
.qualification-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 15px;
}

.qualification-item {
  border: 1px solid var(--border-color);
  padding: 10px;
  background: var(--bg-soft);
  text-align: center;
}

.qualification-item img {
  max-width: 100%;
  height: auto;
  display: block;
  filter: contrast(0.9);
}

.qualification-item span {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 8px;
  display: block;
}

/* 行业资讯文字列表 */
.industry-news-list {
  border-top: 1px solid var(--border-color);
}

.industry-news-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 0;
  border-bottom: 1px solid var(--border-color);
  transition: 0.2s;
}

.industry-news-item:hover {
  padding-left: 10px;
  background: var(--bg-soft);
}

.industry-news-item .news-title {
  font-size: 15px;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  padding-right: 20px;
}

.industry-news-item .news-date {
  font-size: 13px;
  color: var(--text-dim);
}

.industry-news-item:hover .news-title {
  color: var(--tech-blue);
}

@media (max-width: 991px) {
  .news-split-grid {
    flex-direction: column;
    gap: 50px;
  }

  .adv-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .adv-grid {
    grid-template-columns: 1fr;
  }

  .qualification-list {
    grid-template-columns: 1fr 1fr;
  }
}


/* --- 底部 Footer --- */
.site-footer {
  background: var(--matte-black);
  color: var(--text-muted);
  border-top: 2px solid var(--tech-blue);
}

.footer-city {
  background: rgba(0, 0, 0, 0.2);
  padding: 15px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.city-inner {
  max-width: var(--site-max-width);
  width: 92%;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  align-items: center;
}

.city-inner span {
  color: #fff;
  opacity: 0.8;
}

.city-inner a {
  color: var(--text-dim);
}

.city-inner a:hover {
  color: var(--tech-blue);
}

.footer-main {
  max-width: var(--site-max-width);
  width: 92%;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.5fr 1fr;
  gap: 60px;
  padding: 70px 0;
  font-size: 14px;
}

.footer-column h4 {
  color: #fff;
  font-size: 16px;
  margin-bottom: 30px;
  display: flex;
  align-items: center;
  text-transform: uppercase;
}

.footer-column h4::before {
  content: "";
  width: 4px;
  height: 16px;
  background: var(--tech-blue);
  margin-right: 12px;
}

.footer-column p {
  line-height: 1.8;
  color: #94a3b8;
}

.footer-column ul li {
  margin-bottom: 12px;
  margin-top: 12px;
}

.footer-column ul li a:hover {
  color: #fff;
  text-decoration: underline;
}

.footer-contact li {
  display: flex;
  align-items: flex-start;
  margin-bottom: 20px;
}

.footer-contact i {
  width: 32px;
  height: 32px;
  background: rgba(255, 255, 255, 0.05);
  color: #64748b;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 12px;
  font-size: 14px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-contact .info-label {
  display: block;
  font-size: 12px;
  color: #94a3b8;
  margin-bottom: 2px;
}

.footer-contact .info-val {
  display: block;
  color: #cbd5e1;
}

.footer-qrcode {
  text-align: center;
}

.footer-qrcode .img-box {
  display: inline-block;
  padding: 10px;
  background: #fff;
  border: 1px solid var(--border-color);
}

.footer-qrcode img {
  width: 110px;
  display: block;
}

.footer-qrcode span {
  display: block;
  margin-top: 12px;
  font-size: 12px;
  color: #475569;
}

.footer-bottom {
  background: var(--deep-charcoal);
  padding: 30px 0;
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.02);
}

.footer-bottom p {
  font-size: 12px;
  color: #334155;
}

/* 悬浮工具栏 */
.online-service {
  position: fixed;
  right: 25px;
  bottom: 100px;
  z-index: 99;
}

.service-item {
  width: 46px;
  height: 46px;
  background: #fff;
  border: 1px solid var(--border-color);
  margin-bottom: 1px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-muted);
}

.service-item:hover {
  background: var(--tech-blue);
  color: #fff;
  border-color: var(--tech-blue);
}

/* 移动端悬浮条 */
.mobile-fixed-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 60px;
  background: #fff;
  display: none;
  z-index: 1000;
}

.m-fixed-inner {
  display: flex;
  width: 100%;
  height: 100%;
}

.m-fixed-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #94a3b8;
  font-size: 11px;
  border-right: 1px solid rgba(255, 255, 255, 0.05);
}

.m-fixed-item:last-child {
  border-right: none;
}

.m-fixed-item i {
  font-size: 18px;
  margin-bottom: 2px;
  color: var(--tech-blue);
}

/* --- 内页通用 Banner --- */
.page-banner {
  height: 280px;
  background: var(--matte-black);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #fff;
  position: relative;
  overflow: hidden;
}

.page-banner::after {
  content: "CHEMICAL";
  position: absolute;
  font-size: 150px;
  font-weight: 900;
  color: rgba(255, 255, 255, 0.03);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  white-space: nowrap;
  z-index: 0;
}

.page-banner-content {
  position: relative;
  z-index: 1;
}

.page-banner h1 {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 10px;
  letter-spacing: 2px;
}

.page-banner p {
  font-size: 14px;
  opacity: 0.6;
  text-transform: uppercase;
  letter-spacing: 4px;
}

/* --- 面包屑导航 --- */
.breadcrumb-nav {
  background: var(--bg-soft);
  padding: 15px 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 50px;
}

.breadcrumb-nav .container {
  display: flex;
  align-items: center;
  font-size: 13px;
  color: var(--text-muted);
}

.breadcrumb-nav a {
  color: var(--text-dim);
  margin: 0 10px;
}

.breadcrumb-nav a:first-child {
  margin-left: 0;
}

.breadcrumb-nav a:hover {
  color: var(--tech-blue);
}

.breadcrumb-nav span {
  color: var(--text-main);
  font-weight: 600;
}

/* --- 详情页双栏布局 --- */
.page-container {
  display: flex;
  gap: 50px;
  padding-bottom: 100px;
}

.page-sidebar {
  width: 260px;
  flex-shrink: 0;
  position: sticky;
  top: 140px;
  height: fit-content;
}

.page-main {
  flex: 1;
  min-width: 0;
}

.side-menu-title {
  padding: 25px;
  background: var(--tech-blue);
  color: #fff;
}

.side-menu-title h3 {
  font-size: 18px;
  font-weight: 700;
  margin: 0;
}

.side-menu-title span {
  font-size: 11px;
  opacity: 0.6;
  text-transform: uppercase;
  display: block;
  margin-top: 5px;
}

.side-menu-list {
  background: #fff;
  border: 1px solid var(--border-color);
  border-top: none;
}

.side-menu-list li a {
  display: block;
  padding: 15px 25px;
  border-bottom: 1px solid var(--bg-soft);
  font-size: 16px;
  font-weight: bold;
  color: var(--text-muted);
  transition: 0.3s;
}

.side-menu-list li.active a,
.side-menu-list li a:hover {
  background: var(--bg-soft);
  color: var(--tech-blue);
  font-weight: 700;
  padding-left: 35px;
}

/* --- 富文本排版规范 --- */
.article-header {
  margin-bottom: 40px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 20px;
}

.article-header h2 {
  font-size: 28px;
  color: var(--text-main);
  font-weight: 800;
  margin-bottom: 15px;
}

.article-content {
  font-size: 16px;
  line-height: 2;
  color: #444;
  text-align: justify;
}

.article-content p {
  margin-bottom: 25px;
}

.article-content img {
  max-width: 100%;
  height: auto !important;
  margin: 20px 0;
  border: 1px solid var(--border-color);
  padding: 5px;
  background: #fff;
}

@media (max-width: 991px) {
  .page-container {
    flex-direction: column;
  }

  .page-sidebar {
    width: 100%;
    position: static;
  }

  .page-banner {
    height: 200px;
  }

  .page-banner h1 {
    font-size: 28px;
  }
}

@media (max-width: 1200px) {
  .product-card-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 991px) {
  .pc-menu {
    display: none;
  }

  .mobile-toggle {
    display: block;
  }

  .top-right {
    gap: 15px;
  }

  .about-grid {
    flex-direction: column;
  }

  .product-grid-layout {
    flex-direction: column;
  }

  .product-sidebar {
    width: 100%;
    position: static;
    margin-bottom: 30px;
  }

  .footer-main {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }

  .adv-grid {
    grid-template-columns: 1fr 1fr;
  }

  .news-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  :root {
    --topbar-h: 55px;
  }

  .top-container {
    flex-direction: column;
    gap: 5px;
    padding: 8px 0;
  }

  .top-right {
    gap: 10px;
    font-size: 11px;
  }

  .header-nav {
    height: 70px;
  }

  .logo img {
    height: 35px;
  }

  .banner-swiper {
    height: 350px;
  }

  .banner-text h1 {
    font-size: 26px;
  }

  .adv-grid {
    grid-template-columns: 1fr 1fr;
  }

  .product-card-grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer-main {
    grid-template-columns: 1fr;
  }

  .news-grid {
    grid-template-columns: 1fr;
  }

  .mobile-fixed-nav {
    display: flex;
  }

  .online-service {
    display: none;
  }
}