/* ============================================
   瑞泉水处理 - 主样式表
   设计风格：简约大气，导航和banner一体
   字体：Noto Sans SC (大陆可访问的开源中文字体)
   ============================================ */

/* CSS Variables - 主题色 */
:root {
  --color-primary: #0a6cb8;
  --color-primary-dark: #084d83;
  --color-primary-light: #0e8fd6;
  --color-accent: #06b6d4;
  --color-text: #1f2937;
  --color-text-light: #4b5563;
  --color-text-muted: #6b7280;
  --color-bg: #ffffff;
  --color-bg-soft: #f6f9fc;
  --color-bg-section: #f0f6fb;
  --color-border: #e5e7eb;
  --color-border-soft: #eef2f7;
  --shadow-sm: 0 1px 2px rgba(10, 108, 184, 0.05);
  --shadow-md: 0 4px 16px rgba(10, 108, 184, 0.08);
  --shadow-lg: 0 12px 40px rgba(10, 108, 184, 0.12);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --container-width: 1240px;
  --header-height: 80px;
  --font-sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
}

/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  word-break: break-word;
  overflow-wrap: break-word;
}
img, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--color-primary-dark); }
h1, h2, h3, h4, h5, h6 { margin: 0 0 .5em; font-weight: 700; line-height: 1.3; color: var(--color-text); }
h1 { font-size: clamp(28px, 4vw, 44px); }
h2 { font-size: clamp(24px, 3.2vw, 34px); }
h3 { font-size: clamp(18px, 2.2vw, 22px); }
p { margin: 0 0 1em; }
ul, ol { margin: 0 0 1em; padding-left: 1.5em; }
button { font-family: inherit; cursor: pointer; }

/* Container */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================
   Header + Banner 一体化设计
   顶部公告条（浅灰） + 白色主导航 + 蓝色 Hero
   ============================================ */
.site-header {
  position: relative;
  background: #ffffff;
  color: #1f2937;
  overflow: hidden;
}
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
}

/* --- 顶部公告条（浅灰细条） --- */
.top-bar {
  position: relative;
  z-index: 6;
  background: linear-gradient(90deg, #f4f8fc 0%, #eaf2f9 50%, #f4f8fc 100%);
  color: #4b6076;
  font-size: 12.5px;
  height: 36px;
  display: flex;
  align-items: center;
  border-bottom: 1px solid #e6eef5;
}
.top-bar-inner {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.top-bar-left {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.top-bar-left .slogan {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  letter-spacing: .5px;
  color: #4b6076;
}
.top-bar-left .slogan svg { width: 13px; height: 13px; color: var(--color-primary); opacity: .85; }
.top-bar-left .dot { opacity: .35; color: #94a3b8; }
.top-bar-left .badge {
  background: linear-gradient(135deg, #0a6cb8, #0e8fd6);
  color: #fff;
  padding: 2px 9px;
  border-radius: 4px;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 1px;
  box-shadow: 0 2px 6px rgba(10, 108, 184, 0.25);
}
.top-bar-right {
  display: flex;
  align-items: center;
  gap: 16px;
}
.top-bar-right a {
  color: #4b6076;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: color .2s;
}
.top-bar-right a:hover { color: var(--color-primary); }
.top-bar-right svg { width: 13px; height: 13px; opacity: .8; }
.top-bar-phone {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  font-size: 13.5px;
  color: var(--color-primary);
  letter-spacing: 1px;
}
.top-bar-phone svg { width: 14px; height: 14px; color: var(--color-primary); }

/* --- 主导航条（白色） --- */
.top-nav-wrap {
  position: relative;
  z-index: 5;
  background: #ffffff;
}
.top-nav {
  position: relative;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 78px;
  gap: 18px;
  background: #ffffff;
  padding: 0 24px;
  margin: 0 auto;
  max-width: var(--container-width);
}

/* 底部蓝色装饰线 */
.top-nav-wrap::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg,
    var(--color-primary) 0%,
    var(--color-primary-light) 50%,
    var(--color-accent) 100%);
  z-index: 1;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--color-text);
  text-decoration: none;
  flex-shrink: 0;
}
.brand-logo {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, #0a6cb8 0%, #0e8fd6 100%);
  display: grid;
  place-items: center;
  box-shadow: 0 4px 14px rgba(10, 108, 184, 0.28);
  flex-shrink: 0;
  position: relative;
}
.brand-logo::after {
  content: "";
  position: absolute;
  inset: -3px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(10, 108, 184, .25), transparent 60%);
  z-index: -1;
  filter: blur(6px);
}
.brand-logo svg { width: 28px; height: 28px; }
.brand-text {
  display: flex;
  align-items: center;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 1px;
  white-space: nowrap;
  line-height: 1.1;
}
.brand-text .brand-name { display: inline-flex; align-items: baseline; gap: 2px; color: var(--color-text); }
.brand-text .brand-name sup {
  font-size: 11px;
  vertical-align: super;
  font-weight: 500;
  color: var(--color-primary);
  margin-left: 1px;
}
.brand-divider {
  display: inline-block;
  margin: 0 9px;
  color: #c8d4e3;
  font-weight: 300;
  font-size: 19px;
}
.brand-sub {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--color-primary);
  white-space: nowrap;
}

.main-menu {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
  padding: 0;
  margin: 0;
  flex: 1;
  justify-content: center;
}
.main-menu li { list-style: none; }
.main-menu a {
  position: relative;
  display: inline-block;
  color: var(--color-text);
  padding: 10px 13px;
  font-size: 15px;
  font-weight: 500;
  border-radius: 8px;
  transition: color .2s, background .2s;
  white-space: nowrap;
}
.main-menu a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -32px;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: 3px 3px 0 0;
  transition: width .3s ease, left .3s ease;
  box-shadow: 0 -2px 8px rgba(10, 108, 184, 0.4);
}
.main-menu a:hover {
  color: var(--color-primary);
  background: rgba(10, 108, 184, 0.05);
}
.main-menu a:hover::after {
  width: calc(100% - 20px);
  left: 10px;
}
.main-menu a.active {
  color: var(--color-primary);
  font-weight: 600;
  background: rgba(10, 108, 184, 0.05);
}
.main-menu a.active::after {
  width: calc(100% - 20px);
  left: 10px;
}

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.header-phone {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  white-space: nowrap;
  padding: 6px 4px;
  transition: color .2s;
}
.header-phone:hover { color: var(--color-primary-dark); }
.header-phone svg { width: 17px; height: 17px; opacity: .9; }
.header-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  background: linear-gradient(135deg, #0a6cb8 0%, #0e8fd6 100%);
  color: #fff;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  box-shadow: 0 4px 14px rgba(10, 108, 184, 0.32);
  transition: transform .2s, box-shadow .2s;
  white-space: nowrap;
}
.header-btn:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(10, 108, 184, 0.42); color: #fff; }
.header-btn svg { width: 14px; height: 14px; }
.menu-toggle {
  display: none;
  background: var(--color-primary);
  border: none;
  border-radius: 8px;
  padding: 8px 10px;
  color: #fff;
  font-size: 14px;
  cursor: pointer;
}

/* Hero / Banner 蓝色背景区 */
.hero-section {
  position: relative;
  background: linear-gradient(135deg, #0a6cb8 0%, #0e8fd6 50%, #06b6d4 100%);
  color: #fff;
  overflow: hidden;
  isolation: isolate;
}
.hero-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.18) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(6, 182, 212, 0.25) 0%, transparent 50%),
    repeating-linear-gradient(45deg, rgba(255, 255, 255, 0.04) 0 1px, transparent 1px 18px);
  pointer-events: none;
  z-index: 0;
}
.hero-section::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at top right, rgba(255, 255, 255, 0.08), transparent 60%),
    radial-gradient(ellipse at bottom left, rgba(0, 30, 60, 0.2), transparent 60%);
  pointer-events: none;
  z-index: 0;
}
.hero-section .container { position: relative; z-index: 1; }
.hero-section .float-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: .35;
  z-index: 0;
  pointer-events: none;
}
.hero-section .float-blob.b1 { width: 360px; height: 360px; top: -120px; left: -120px; background: rgba(255, 255, 255, 0.4); }
.hero-section .float-blob.b2 { width: 280px; height: 280px; bottom: -80px; right: -80px; background: rgba(6, 182, 212, 0.6); }
.hero-section .float-blob.b3 { width: 220px; height: 220px; top: 40%; right: 25%; background: rgba(255, 255, 255, 0.25); }

/* Hero / Banner 内容区 */
.hero {
  position: relative;
  z-index: 2;
  padding: 110px 0 100px;
  text-align: center;
}
.hero-eyebrow {
  display: inline-block;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.9);
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.25);
  padding: 6px 16px;
  border-radius: 999px;
  margin-bottom: 24px;
  letter-spacing: 1px;
}
.hero h1 {
  color: #fff;
  font-size: clamp(28px, 4.6vw, 52px);
  margin: 0 0 16px;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
  word-break: keep-all;
  text-wrap: balance;
  overflow-wrap: break-word;
  font-weight: 800;
  letter-spacing: 1px;
}
.hero h1 strong {
  background: linear-gradient(135deg, #ffffff 0%, #c8ecff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.15));
  font-weight: 800;
}
.hero-sub {
  font-size: clamp(15px, 1.8vw, 18px);
  color: rgba(255, 255, 255, 0.92);
  max-width: 760px;
  margin: 0 auto 32px;
  line-height: 1.8;
}
.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 56px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: transform .2s, box-shadow .2s, background .2s;
  border: 1px solid transparent;
  text-decoration: none;
}
.btn-primary {
  background: #fff;
  color: var(--color-primary);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}
.btn-primary:hover { background: #f0f9ff; color: var(--color-primary-dark); transform: translateY(-2px); }
.btn-ghost {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.35);
  backdrop-filter: blur(6px);
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.2); color: #fff; transform: translateY(-2px); }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  max-width: 980px;
  margin: 0 auto;
}
.hero-stat {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-md);
  padding: 22px 14px;
  text-align: center;
}
.hero-stat-num {
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 800;
  color: #fff;
  line-height: 1;
  margin-bottom: 6px;
  font-feature-settings: "tnum" 1;
}
.hero-stat-label {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.85);
  letter-spacing: 1px;
}

/* ============================================
   Section 通用
   ============================================ */
section { padding: 80px 0; }
.section-alt { background: var(--color-bg-section); }
.section-soft { background: var(--color-bg-soft); }
.section-head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px;
}
.section-eyebrow {
  display: inline-block;
  font-size: 13px;
  color: var(--color-primary);
  font-weight: 600;
  letter-spacing: 4px;
  margin-bottom: 12px;
  text-transform: uppercase;
}
.section-head h2 {
  font-size: clamp(24px, 3.4vw, 36px);
  margin: 0 0 14px;
  color: var(--color-text);
  font-weight: 800;
}
.section-head h2 strong {
  color: var(--color-primary);
  font-weight: 800;
}
.section-head p {
  font-size: 16px;
  color: var(--color-text-light);
  margin: 0;
  line-height: 1.8;
}

/* ============================================
   核心业务区
   ============================================ */
.biz-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.biz-card {
  position: relative;
  background: #fff;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  transition: transform .3s, box-shadow .3s, border-color .3s;
  overflow: hidden;
}
.biz-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10, 108, 184, 0.04), transparent 60%);
  opacity: 0;
  transition: opacity .3s;
}
.biz-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(10, 108, 184, 0.2);
}
.biz-card:hover::before { opacity: 1; }
.biz-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  display: grid;
  place-items: center;
  color: #fff;
  margin-bottom: 20px;
}
.biz-icon svg { width: 28px; height: 28px; }
.biz-card h3 { font-size: 19px; margin: 0 0 12px; color: var(--color-text); }
.biz-card p { font-size: 14.5px; color: var(--color-text-light); margin: 0 0 16px; line-height: 1.7; }
.biz-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  padding: 0;
  margin: 0;
}
.biz-tags li {
  font-size: 12px;
  color: var(--color-primary);
  background: rgba(10, 108, 184, 0.08);
  padding: 4px 10px;
  border-radius: 999px;
}

/* 扩展业务 9 栏 */
.biz-grid-extra {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 32px;
}
.biz-mini {
  background: #fff;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  transition: border-color .2s, transform .2s;
}
.biz-mini:hover { border-color: rgba(10, 108, 184, 0.3); transform: translateX(4px); }
.biz-mini-icon {
  width: 40px; height: 40px;
  border-radius: 10px;
  background: rgba(10, 108, 184, 0.1);
  color: var(--color-primary);
  display: grid; place-items: center;
  flex-shrink: 0;
}
.biz-mini-icon svg { width: 20px; height: 20px; }
.biz-mini-text { font-size: 14px; color: var(--color-text); font-weight: 500; }

/* ============================================
   优势区
   ============================================ */
.advantage-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 1080px;
  margin: 0 auto;
}
.advantage-card {
  text-align: center;
  padding: 32px 20px;
  background: #fff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-soft);
  transition: transform .3s, box-shadow .3s;
}
.advantage-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.advantage-num {
  font-size: 42px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
  margin-bottom: 8px;
  font-feature-settings: "tnum" 1;
}
.advantage-label { font-size: 16px; font-weight: 600; margin-bottom: 6px; }
.advantage-desc { font-size: 13.5px; color: var(--color-text-muted); margin: 0; }

/* ============================================
   产品展示
   ============================================ */
.product-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-bottom: 36px;
}
.product-tab {
  background: #fff;
  border: 1px solid var(--color-border);
  color: var(--color-text-light);
  padding: 8px 18px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  transition: all .2s;
}
.product-tab:hover { color: var(--color-primary); border-color: var(--color-primary); }
.product-tab.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.product-card {
  background: #fff;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform .3s, box-shadow .3s, border-color .3s;
  cursor: pointer;
}
.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(10, 108, 184, 0.2);
}
.product-img {
  position: relative;
  aspect-ratio: 4/3;
  background: var(--color-bg-soft);
  overflow: hidden;
}
.product-img img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .5s;
}
.product-card:hover .product-img img { transform: scale(1.05); }
.product-img::after {
  content: "点击放大";
  position: absolute;
  inset: 0;
  background: rgba(10, 76, 130, 0.7);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 14px;
  opacity: 0;
  transition: opacity .2s;
}
.product-card:hover .product-img::after { opacity: 1; }
.product-info { padding: 16px 18px 18px; }
.product-cat {
  font-size: 12px;
  color: var(--color-primary);
  background: rgba(10, 108, 184, 0.08);
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  margin-bottom: 8px;
}
.product-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 6px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 45px;
}
.product-desc {
  font-size: 13px;
  color: var(--color-text-muted);
  margin: 0;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 产品分类标签 */
.product-section { display: none; }
.product-section.active { display: grid; }

/* ============================================
   服务流程
   ============================================ */
.flow-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
  position: relative;
}
.flow-step {
  text-align: center;
  position: relative;
  padding: 24px 12px;
}
.flow-step::after {
  content: "→";
  position: absolute;
  top: 32px;
  right: -14px;
  color: var(--color-primary);
  font-size: 22px;
  font-weight: 300;
}
.flow-step:last-child::after { display: none; }
.flow-num {
  width: 56px; height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #fff;
  display: grid; place-items: center;
  font-size: 22px; font-weight: 700;
  margin: 0 auto 14px;
  box-shadow: 0 6px 16px rgba(10, 108, 184, 0.25);
}
.flow-title { font-size: 15px; font-weight: 600; margin-bottom: 6px; }
.flow-desc { font-size: 12.5px; color: var(--color-text-muted); line-height: 1.5; margin: 0; }

/* ============================================
   应用领域
   ============================================ */
.app-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.app-item {
  background: #fff;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-md);
  padding: 22px 18px;
  text-align: center;
  transition: transform .2s, border-color .2s;
}
.app-item:hover { transform: translateY(-3px); border-color: rgba(10, 108, 184, 0.3); }
.app-icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  background: rgba(10, 108, 184, 0.1);
  color: var(--color-primary);
  display: grid; place-items: center;
  margin: 0 auto 12px;
}
.app-icon svg { width: 22px; height: 22px; }
.app-title { font-size: 14.5px; font-weight: 600; margin: 0; }

/* ============================================
   公司介绍
   ============================================ */
.about-wrap {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 56px;
  align-items: center;
}
.about-content h2 { font-size: clamp(24px, 3.2vw, 34px); margin-bottom: 20px; }
.about-content p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.85;
  margin-bottom: 16px;
}
.about-list {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px 24px;
}
.about-list li {
  font-size: 14.5px;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 8px;
}
.about-list li::before {
  content: "";
  width: 6px; height: 6px;
  background: var(--color-primary);
  border-radius: 50%;
  flex-shrink: 0;
}
.about-visual {
  position: relative;
  aspect-ratio: 1/1;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(135deg, #0a4a7e 0%, #0a6cb8 60%, #06b6d4 100%);
  box-shadow: var(--shadow-lg);
}
.about-visual::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    radial-gradient(circle at 30% 20%, rgba(255, 255, 255, 0.2) 0%, transparent 50%),
    radial-gradient(circle at 70% 80%, rgba(6, 182, 212, 0.3) 0%, transparent 50%);
}
.about-visual-text {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  text-align: center;
  color: #fff;
  padding: 24px;
}
.about-visual-text .big {
  font-size: clamp(40px, 6vw, 64px);
  font-weight: 800;
  line-height: 1;
  margin-bottom: 12px;
  text-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}
.about-visual-text .label {
  font-size: 16px;
  letter-spacing: 4px;
  opacity: 0.9;
}

/* ============================================
   FAQ
   ============================================ */
.faq-list {
  max-width: 920px;
  margin: 0 auto;
  display: grid;
  gap: 12px;
}
.faq-item {
  background: #fff;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color .2s, box-shadow .2s;
}
.faq-item[open] {
  border-color: rgba(10, 108, 184, 0.3);
  box-shadow: var(--shadow-sm);
}
.faq-q {
  list-style: none;
  cursor: pointer;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  user-select: none;
}
.faq-q::-webkit-details-marker { display: none; }
.faq-q::after {
  content: "+";
  width: 28px; height: 28px;
  border-radius: 50%;
  background: rgba(10, 108, 184, 0.08);
  color: var(--color-primary);
  display: grid; place-items: center;
  font-size: 18px;
  font-weight: 400;
  transition: transform .2s, background .2s, color .2s;
  flex-shrink: 0;
}
.faq-item[open] .faq-q::after {
  content: "−";
  background: var(--color-primary);
  color: #fff;
}
.faq-a {
  padding: 0 24px 22px;
  font-size: 14.5px;
  color: var(--color-text-light);
  line-height: 1.85;
  border-top: 1px dashed var(--color-border-soft);
  margin-top: 0;
  padding-top: 16px;
}

/* ============================================
   其他设备产品站
   ============================================ */
.sister-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.sister-card {
  display: flex;
  align-items: center;
  gap: 16px;
  background: #fff;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-md);
  padding: 22px 24px;
  color: var(--color-text);
  transition: transform .2s, border-color .2s, box-shadow .2s;
}
.sister-card:hover {
  transform: translateY(-3px);
  border-color: rgba(10, 108, 184, 0.3);
  box-shadow: var(--shadow-md);
  color: var(--color-primary-dark);
}
.sister-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #fff;
  display: grid; place-items: center;
  flex-shrink: 0;
}
.sister-icon svg { width: 24px; height: 24px; }
.sister-text { flex: 1; min-width: 0; }
.sister-name { font-size: 16px; font-weight: 600; margin: 0 0 4px; }
.sister-link { font-size: 12.5px; color: var(--color-text-muted); margin: 0; font-family: ui-monospace, "SF Mono", Consolas, monospace; }
.sister-arrow {
  color: var(--color-text-muted);
  flex-shrink: 0;
  transition: transform .2s, color .2s;
}
.sister-card:hover .sister-arrow { color: var(--color-primary); transform: translateX(4px); }
.sister-arrow svg { width: 18px; height: 18px; }

/* ============================================
   联系方式
   ============================================ */
.contact-wrap {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 32px;
  background: #fff;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-md);
}
.contact-info { display: grid; gap: 18px; }
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}
.contact-item-icon {
  width: 40px; height: 40px;
  border-radius: 10px;
  background: rgba(10, 108, 184, 0.1);
  color: var(--color-primary);
  display: grid; place-items: center;
  flex-shrink: 0;
}
.contact-item-icon svg { width: 20px; height: 20px; }
.contact-item-body { flex: 1; min-width: 0; }
.contact-item-label {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 4px;
  letter-spacing: 1px;
}
.contact-item-value {
  font-size: 15px;
  color: var(--color-text);
  font-weight: 500;
  word-break: break-all;
}
.contact-item-value.phone { font-size: 22px; font-weight: 700; color: var(--color-primary); letter-spacing: 1px; }
.contact-qr {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-soft);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
}
.contact-qr img {
  width: 160px; height: 160px;
  border: 4px solid #fff;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  margin-bottom: 12px;
}
.contact-qr-label { font-size: 14px; color: var(--color-text); font-weight: 600; }
.contact-qr-sub { font-size: 12.5px; color: var(--color-text-muted); margin-top: 4px; }

/* ============================================
   其他城市链接
   ============================================ */
.city-list {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 10px;
}
.city-list a {
  display: block;
  text-align: center;
  padding: 12px 8px;
  background: #fff;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 14px;
  font-weight: 500;
  transition: all .2s;
}
.city-list a:hover, .city-list a.current {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
  background: #0a2540;
  color: rgba(255, 255, 255, 0.8);
  padding: 40px 0 24px;
  font-size: 13.5px;
}
.footer-top { display: flex; flex-wrap: wrap; gap: 16px 32px; justify-content: center; margin-bottom: 16px; }
.footer-top a { color: rgba(255, 255, 255, 0.85); }
.footer-top a:hover { color: #fff; }
.footer-divider { color: rgba(255, 255, 255, 0.3); }
.footer-copy {
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 20px;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.8;
}
.footer-copy a { color: rgba(255, 255, 255, 0.85); border-bottom: 1px dashed rgba(255, 255, 255, 0.3); padding-bottom: 1px; }
.footer-copy a:hover { color: #fff; border-bottom-color: #fff; }

/* ============================================
   弹层 - 图片放大
   ============================================ */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 24px;
}
.lightbox.open { display: flex; }
.lightbox img {
  max-width: 90vw;
  max-height: 90vh;
  border-radius: var(--radius-md);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}
.lightbox-close {
  position: absolute;
  top: 24px; right: 24px;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  border: none;
  font-size: 24px;
  display: grid; place-items: center;
  cursor: pointer;
  transition: background .2s;
}
.lightbox-close:hover { background: rgba(255, 255, 255, 0.3); }