/* ============ 基础重置 ============ */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  font-size: 14px;
  line-height: 1.7;
  color: #333;
  background: #f7f9fc;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; transition: color .2s ease; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { font-weight: 600; line-height: 1.3; }
button { font: inherit; cursor: pointer; border: 0; background: transparent; }

/* ============ 通用容器 ============ */
.container { max-width: 1240px; margin: 0 auto; padding: 0 20px; }
.container-narrow { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

/* ============ 导航栏 ============ */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: all .3s ease;
  background: transparent;
}
.site-nav.scrolled {
  background: rgba(255,255,255,.97);
  box-shadow: 0 2px 16px rgba(0,0,0,.06);
  backdrop-filter: blur(8px);
}
.nav-inner {
  max-width: 1240px; margin: 0 auto; padding: 0 20px;
  display: flex; align-items: center; justify-content: space-between;
  height: 78px;
}
.site-nav.scrolled .nav-inner { height: 64px; }

.logo {
  display: flex; align-items: center; gap: 0;
  font-size: 22px; font-weight: 700; color: #fff;
  letter-spacing: 1px;
  text-shadow: 0 2px 8px rgba(0,0,0,.2);
  transition: all .3s ease;
}
.site-nav.scrolled .logo { color: #1a1a1a; text-shadow: none; }
.logo .logo-main { font-size: 22px; }
.logo .logo-divider { font-size: 22px; margin: 0 8px; opacity: .85; }
.logo .logo-sub { font-size: 22px; }

.nav-menu { display: flex; align-items: center; gap: 4px; }
.nav-menu a {
  display: block; padding: 10px 18px; font-size: 15px;
  color: #fff; border-radius: 6px;
  text-shadow: 0 1px 3px rgba(0,0,0,.15);
  transition: all .2s ease;
}
.site-nav.scrolled .nav-menu a { color: #333; text-shadow: none; }
.nav-menu a:hover { background: rgba(255,255,255,.18); }
.site-nav.scrolled .nav-menu a:hover { background: rgba(0,0,0,.05); }
.nav-menu a.active { background: rgba(255,255,255,.2); font-weight: 600; }
.site-nav.scrolled .nav-menu a.active { background: rgba(0,0,0,.06); }

.menu-toggle {
  display: none; width: 32px; height: 32px;
  flex-direction: column; justify-content: center; gap: 5px;
}
.menu-toggle span {
  display: block; height: 2px; background: #fff;
  border-radius: 1px; transition: all .3s ease;
}
.site-nav.scrolled .menu-toggle span { background: #1a1a1a; }

.mobile-menu {
  position: fixed; top: 64px; left: 0; right: 0;
  background: #fff; box-shadow: 0 4px 16px rgba(0,0,0,.08);
  padding: 16px 20px; display: none; z-index: 99;
}
.mobile-menu.active { display: block; }
.mobile-menu a {
  display: block; padding: 14px 12px; border-bottom: 1px solid #f0f0f0;
  color: #333; font-size: 15px;
}

@media (max-width: 900px) {
  .nav-menu { display: none; }
  .menu-toggle { display: flex; }
}

/* ============ Banner ============ */
.banner {
  position: relative;
  min-height: 720px;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden; color: #fff;
  text-align: center;
  padding-top: 78px;
}
.banner-bg {
  position: absolute; inset: 0; z-index: -2;
  background-size: cover; background-position: center;
  animation: kenburns 24s ease-in-out infinite alternate;
}
@keyframes kenburns {
  0% { transform: scale(1); }
  100% { transform: scale(1.08); }
}
.banner-overlay {
  position: absolute; inset: 0; z-index: -1;
  background: linear-gradient(180deg, rgba(0,0,0,.45) 0%, rgba(0,0,0,.25) 50%, rgba(0,0,0,.55) 100%);
}
.banner-content { position: relative; z-index: 1; max-width: 960px; padding: 0 20px; }
.banner h1 {
  font-size: 44px; font-weight: 700; margin-bottom: 18px;
  letter-spacing: 2px;
  text-shadow: 0 4px 16px rgba(0,0,0,.3);
  animation: fadeInUp 1s ease;
}
.banner .banner-sub {
  font-size: 18px; line-height: 1.8; margin-bottom: 32px;
  text-shadow: 0 2px 8px rgba(0,0,0,.3);
  animation: fadeInUp 1s ease .15s both;
}
.banner .banner-tags {
  display: flex; flex-wrap: wrap; gap: 10px; justify-content: center;
  margin-bottom: 32px;
  animation: fadeInUp 1s ease .3s both;
}
.banner .banner-tags span {
  padding: 6px 16px; border: 1px solid rgba(255,255,255,.4);
  border-radius: 20px; font-size: 13px;
  background: rgba(255,255,255,.08);
  backdrop-filter: blur(4px);
}
.banner-cta {
  display: inline-flex; gap: 12px; flex-wrap: wrap; justify-content: center;
  animation: fadeInUp 1s ease .45s both;
}
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 12px 28px; border-radius: 30px; font-size: 15px;
  font-weight: 500; transition: all .25s ease; cursor: pointer;
}
.btn-primary {
  background: #fff; color: #1a1a1a;
  box-shadow: 0 6px 20px rgba(0,0,0,.15);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(0,0,0,.2); }
.btn-ghost {
  background: rgba(255,255,255,.15); color: #fff;
  border: 1px solid rgba(255,255,255,.5);
  backdrop-filter: blur(4px);
}
.btn-ghost:hover { background: rgba(255,255,255,.25); }

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
  .banner { min-height: 580px; padding-top: 64px; }
  .banner h1 { font-size: 30px; }
  .banner .banner-sub { font-size: 15px; }
  .nav-inner { height: 64px; }
  .logo .logo-main, .logo .logo-divider, .logo .logo-sub { font-size: 18px; }
}

/* ============ 章节通用 ============ */
.section { padding: 80px 0; }
.section-tight { padding: 56px 0; }
.section-title {
  text-align: center; margin-bottom: 48px;
}
.section-title h2 {
  font-size: 32px; color: #1a1a1a; margin-bottom: 12px;
  letter-spacing: 1px;
}
.section-title .section-en {
  font-size: 13px; letter-spacing: 4px; color: #999;
  text-transform: uppercase; margin-bottom: 12px;
}
.section-title p {
  font-size: 15px; color: #666; max-width: 720px; margin: 0 auto;
  line-height: 1.8;
}
.section-title::after {
  content: ''; display: block; width: 60px; height: 3px;
  background: var(--accent, #1e88e5); margin: 18px auto 0;
  border-radius: 2px;
}

@media (max-width: 768px) {
  .section { padding: 56px 0; }
  .section-title h2 { font-size: 24px; }
}

/* ============ 动画 ============ */
.animate-on-scroll {
  transition: opacity .8s ease, transform .8s ease;
}
.animate-on-scroll:not(.in-view) {
  opacity: 0; transform: translateY(30px);
}
.animate-on-scroll.in-view { opacity: 1; transform: translateY(0); }

/* ============ 产品展示 ============ */
.product-tabs {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 8px;
  margin-bottom: 40px;
}
.product-tab {
  padding: 10px 24px; border-radius: 24px; font-size: 14px;
  background: #fff; color: #555; cursor: pointer; user-select: none;
  border: 1px solid #e0e6ed; transition: all .25s ease;
}
.product-tab:hover { color: var(--accent, #1e88e5); border-color: var(--accent, #1e88e5); }
.product-tab.active {
  background: var(--accent, #1e88e5); color: #fff; border-color: var(--accent, #1e88e5);
}

.product-grid {
  display: grid; gap: 24px;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
}
.product-card {
  background: #fff; border-radius: 10px; overflow: hidden;
  box-shadow: 0 2px 12px rgba(0,0,0,.04);
  transition: all .3s ease; cursor: pointer;
  display: flex; flex-direction: column;
}
.product-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 14px 36px rgba(0,0,0,.10);
}
.product-card .product-img {
  width: 100%; height: 200px; overflow: hidden; background: #f0f4f8;
  position: relative;
}
.product-card .product-img img {
  position: absolute; left: 0; top: 0;
  width: 100%; height: 100%; object-fit: cover;
  transition: transform .5s ease;
}
.product-card:hover .product-img img { transform: scale(1.08); }
.product-card .product-body { padding: 18px 18px 20px; flex: 1; display: flex; flex-direction: column; }
.product-card .product-cat {
  display: inline-block; font-size: 12px; color: var(--accent, #1e88e5);
  background: rgba(30,136,229,.08); padding: 3px 10px; border-radius: 4px;
  margin-bottom: 8px; align-self: flex-start;
}
.product-card h3 {
  font-size: 16px; color: #1a1a1a; margin-bottom: 8px; line-height: 1.4;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
}
.product-card p {
  font-size: 13px; color: #777; line-height: 1.6;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ============ Lightbox ============ */
.lightbox {
  position: fixed; inset: 0; z-index: 1000;
  background: rgba(0,0,0,.85);
  display: none; align-items: center; justify-content: center;
  padding: 20px;
}
.lightbox.active { display: flex; }
.lightbox img {
  max-width: 92%; max-height: 92%; object-fit: contain;
  border-radius: 6px;
}
.lightbox-close {
  position: absolute; top: 24px; right: 24px;
  width: 40px; height: 40px; border-radius: 50%;
  background: rgba(255,255,255,.15); color: #fff;
  font-size: 22px; display: flex; align-items: center; justify-content: center;
  cursor: pointer;
}
.lightbox-close:hover { background: rgba(255,255,255,.3); }

/* ============ 公司介绍 ============ */
.about-wrap {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
}
.about-img {
  border-radius: 10px; overflow: hidden; box-shadow: 0 12px 40px rgba(0,0,0,.08);
}
.about-img img { width: 100%; height: 100%; object-fit: cover; }
.about-text h2 { font-size: 30px; color: #1a1a1a; margin-bottom: 18px; }
.about-text p { font-size: 15px; color: #555; line-height: 1.9; margin-bottom: 14px; }
.about-features {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 24px;
}
.about-feature {
  padding: 18px; background: #fff; border-radius: 8px;
  border-left: 3px solid var(--accent, #1e88e5);
}
.about-feature h4 { font-size: 15px; color: #1a1a1a; margin-bottom: 4px; }
.about-feature p { font-size: 12px; color: #888; margin: 0; }

@media (max-width: 900px) {
  .about-wrap { grid-template-columns: 1fr; gap: 36px; }
}

/* ============ 数据统计 ============ */
.stats-bar {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
  text-align: center;
}
.stat-item {
  padding: 30px 20px; background: #fff; border-radius: 10px;
  box-shadow: 0 4px 16px rgba(0,0,0,.04);
}
.stat-num {
  font-size: 40px; font-weight: 700; color: var(--accent, #1e88e5);
  margin-bottom: 6px; line-height: 1;
}
.stat-label { font-size: 14px; color: #666; }

@media (max-width: 768px) {
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .stat-num { font-size: 32px; }
}

/* ============ FAQ ============ */
.faq-list { max-width: 980px; margin: 0 auto; }
.faq-item {
  background: #fff; border-radius: 8px; margin-bottom: 12px;
  box-shadow: 0 2px 10px rgba(0,0,0,.04);
  overflow: hidden;
}
.faq-q {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 24px; cursor: pointer; user-select: none;
  font-size: 15px; color: #1a1a1a; font-weight: 500;
  transition: background .2s ease;
}
.faq-q:hover { background: #fafbfc; }
.faq-q::before {
  content: 'Q'; flex-shrink: 0;
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--accent, #1e88e5); color: #fff;
  font-size: 14px; font-weight: 700; margin-right: 14px;
}
.faq-icon {
  width: 20px; height: 20px; flex-shrink: 0; margin-left: 12px;
  position: relative; transition: transform .3s ease;
}
.faq-icon::before, .faq-icon::after {
  content: ''; position: absolute; left: 50%; top: 50%;
  background: #999; border-radius: 1px;
  transition: all .3s ease;
}
.faq-icon::before { width: 12px; height: 2px; transform: translate(-50%, -50%); }
.faq-icon::after { width: 2px; height: 12px; transform: translate(-50%, -50%); }
.faq-item.active .faq-icon::after { transform: translate(-50%, -50%) rotate(90deg); opacity: 0; }
.faq-a {
  padding: 0 24px; max-height: 0; overflow: hidden;
  transition: max-height .4s ease, padding .4s ease;
  color: #555; line-height: 1.8; font-size: 14px;
}
.faq-a-inner { padding: 0 0 20px 42px; }
.faq-item.active .faq-a { max-height: 600px; padding-top: 4px; }

/* ============ 产品子站链接 ============ */
.site-links {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
}
.site-link-card {
  display: flex; align-items: center; justify-content: space-between;
  padding: 22px 24px; background: #fff; border-radius: 10px;
  box-shadow: 0 4px 16px rgba(0,0,0,.05);
  transition: all .25s ease; border: 1px solid transparent;
}
.site-link-card:hover {
  border-color: var(--accent, #1e88e5);
  transform: translateY(-3px);
  box-shadow: 0 12px 28px rgba(0,0,0,.10);
}
.site-link-card .slc-name {
  font-size: 16px; color: #1a1a1a; font-weight: 600;
}
.site-link-card .slc-url {
  font-size: 12px; color: #888; margin-top: 4px;
}
.site-link-card .slc-arrow {
  color: var(--accent, #1e88e5); font-size: 20px;
  transition: transform .25s ease;
}
.site-link-card:hover .slc-arrow { transform: translateX(4px); }

@media (max-width: 768px) {
  .site-links { grid-template-columns: 1fr; }
}

/* ============ 城市链接 ============ */
.city-links {
  display: flex; flex-wrap: wrap; gap: 8px; justify-content: center;
}
.city-links a {
  padding: 8px 16px; background: #fff; border-radius: 20px;
  font-size: 13px; color: #555; box-shadow: 0 2px 6px rgba(0,0,0,.04);
  transition: all .2s ease;
}
.city-links a:hover {
  background: var(--accent, #1e88e5); color: #fff;
  transform: translateY(-2px);
}
.city-links a.current {
  background: var(--accent, #1e88e5); color: #fff;
  pointer-events: none;
}

/* ============ 联系方式 ============ */
.contact-wrap {
  display: grid; grid-template-columns: 1.4fr 1fr; gap: 48px; align-items: stretch;
}
.contact-info {
  background: #fff; border-radius: 12px; padding: 40px;
  box-shadow: 0 4px 24px rgba(0,0,0,.05);
}
.contact-info h3 { font-size: 22px; color: #1a1a1a; margin-bottom: 24px; }
.contact-item {
  display: flex; align-items: flex-start; gap: 14px;
  padding: 14px 0; border-bottom: 1px solid #f0f2f5;
}
.contact-item:last-child { border-bottom: 0; }
.contact-icon {
  flex-shrink: 0; width: 38px; height: 38px; border-radius: 8px;
  background: var(--accent-light, #e3f2fd); color: var(--accent, #1e88e5);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; font-weight: 700;
}
.contact-item .ci-body { flex: 1; min-width: 0; }
.contact-item .ci-label {
  font-size: 12px; color: #999; margin-bottom: 4px;
}
.contact-item .ci-value {
  font-size: 15px; color: #1a1a1a; word-break: break-all;
}
.contact-item .ci-value a:hover { color: var(--accent, #1e88e5); }

.contact-qr {
  background: #fff; border-radius: 12px; padding: 40px;
  box-shadow: 0 4px 24px rgba(0,0,0,.05);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center;
}
.contact-qr img {
  width: 200px; height: 200px; border: 1px solid #eef0f3;
  padding: 8px; background: #fff; border-radius: 8px;
}
.contact-qr p { margin-top: 16px; font-size: 14px; color: #666; }
.contact-qr .qr-tip { font-size: 13px; color: #999; margin-top: 4px; }

@media (max-width: 900px) {
  .contact-wrap { grid-template-columns: 1fr; }
  .contact-info, .contact-qr { padding: 28px; }
  .contact-qr img { width: 180px; height: 180px; }
}

/* ============ Footer ============ */
.footer {
  background: #1a1f2c; color: #aab1c0;
  padding: 50px 0 24px; font-size: 13px;
}
.footer-grid {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 36px;
  margin-bottom: 36px;
}
.footer h4 {
  color: #fff; font-size: 15px; margin-bottom: 16px; font-weight: 600;
}
.footer ul li { margin-bottom: 8px; }
.footer ul a:hover { color: #fff; }
.footer .ft-about { color: #7a8294; line-height: 1.8; }
.footer-bottom {
  padding-top: 24px; border-top: 1px solid #2a3041;
  text-align: center; color: #7a8294; font-size: 12px; line-height: 1.8;
}
.footer-bottom a { color: #aab1c0; }
.footer-bottom a:hover { color: #fff; }

@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* ============ 返回顶部 ============ */
.back-top {
  position: fixed; right: 24px; bottom: 24px; z-index: 99;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--accent, #1e88e5); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; cursor: pointer;
  box-shadow: 0 6px 18px rgba(0,0,0,.15);
  opacity: 0; visibility: hidden; transform: translateY(10px);
  transition: all .3s ease;
}
.back-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { transform: translateY(-2px); }

/* ============ 优势卡片 ============ */
.advantage-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
}
.advantage-card {
  background: #fff; padding: 32px 24px; border-radius: 10px;
  text-align: center; box-shadow: 0 4px 16px rgba(0,0,0,.04);
  transition: all .3s ease; position: relative; overflow: hidden;
}
.advantage-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0;
  height: 3px; background: var(--accent, #1e88e5);
  transform: scaleX(0); transform-origin: left;
  transition: transform .3s ease;
}
.advantage-card:hover { transform: translateY(-6px); box-shadow: 0 16px 36px rgba(0,0,0,.08); }
.advantage-card:hover::before { transform: scaleX(1); }
.advantage-icon {
  width: 64px; height: 64px; border-radius: 50%;
  background: var(--accent-light, #e3f2fd); color: var(--accent, #1e88e5);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 28px; font-weight: 700; margin-bottom: 16px;
}
.advantage-card h3 { font-size: 17px; color: #1a1a1a; margin-bottom: 8px; }
.advantage-card p { font-size: 13px; color: #777; line-height: 1.7; }

@media (max-width: 900px) {
  .advantage-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .advantage-grid { grid-template-columns: 1fr; }
}

/* ============ 区域特点板块 ============ */
.feature-bar {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
}
.feature-card {
  padding: 30px 24px; border-radius: 10px;
  background: #fff; box-shadow: 0 4px 16px rgba(0,0,0,.04);
  transition: all .3s ease;
}
.feature-card:hover { transform: translateY(-4px); }
.feature-card .fc-num {
  font-size: 36px; font-weight: 700; color: var(--accent, #1e88e5);
  margin-bottom: 6px; line-height: 1;
}
.feature-card .fc-title { font-size: 16px; color: #1a1a1a; margin-bottom: 8px; font-weight: 600; }
.feature-card .fc-desc { font-size: 13px; color: #666; line-height: 1.7; }

@media (max-width: 768px) {
  .feature-bar { grid-template-columns: 1fr; }
}

/* ============ 应用场景 ============ */
.scene-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
}
.scene-card {
  position: relative; aspect-ratio: 4/3; border-radius: 10px; overflow: hidden;
  background: #ddd; cursor: pointer;
}
.scene-card img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.scene-card:hover img { transform: scale(1.08); }
.scene-card .scene-name {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 12px 16px; color: #fff; font-size: 14px; font-weight: 500;
  background: linear-gradient(180deg, transparent, rgba(0,0,0,.7));
}

@media (max-width: 768px) {
  .scene-grid { grid-template-columns: repeat(2, 1fr); }
}