/* ==========================================================================
   苏州川发电子科技有限公司 — 全站设计系统
   style.css  (必须在 Tailwind 之后加载)
   --------------------------------------------------------------------------
   目录
   01. 设计令牌 (CSS 变量)
   02. 基础重置 / 排版
   03. 容器与栅格
   04. 调色板工具类
   05. 按钮
   06. 顶部信息条 topbar
   07. 页头 / 导航 / 移动端菜单
   08. Hero
   09. 区块与区块标题
   10. 卡片体系 (feature / biz / product / industry / why / process)
   11. 数据统计区
   12. 参数表
   13. 服务承诺条
   14. 底部 CTA
   15. 页脚
   16. 返回顶部
   17. 工具类 / 动效
   18. 响应式
   ========================================================================== */

/* ==========================================================================
   01. 设计令牌
   ========================================================================== */
:root {
  /* 品牌色板 */
  --cf-primary: #0B4F9E;
  --cf-primary-dark: #083A73;
  --cf-deep: #072B52;
  --cf-gold: #F5A623;
  --cf-gold-dark: #D98A0B;
  --cf-text: #0F172A;
  --cf-muted: #475569;
  --cf-border: #E2E8F0;
  --cf-light: #F1F5F9;
  --cf-white: #FFFFFF;

  /* 形状与阴影 */
  --cf-radius-card: 16px;
  --cf-radius-btn: 8px;
  --cf-radius-sm: 6px;
  --cf-shadow: 0 4px 20px rgba(15, 23, 42, .08);
  --cf-shadow-hover: 0 18px 44px rgba(15, 23, 42, .16);
  --cf-shadow-deep: 0 24px 60px rgba(7, 43, 82, .28);

  /* 字体 */
  --cf-font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;

  /* 布局 */
  --cf-container: 1280px;
  --cf-gutter: 24px;
  --cf-header-h: 74px;
  --cf-ease: cubic-bezier(.22, .7, .25, 1);
}

/* ==========================================================================
   02. 基础重置 / 排版
   ========================================================================== */
html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--cf-header-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--cf-font);
  color: var(--cf-text);
  background: var(--cf-white);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5 {
  font-family: var(--cf-font);
  color: var(--cf-text);
  font-weight: 700;
  line-height: 1.25;
  margin: 0;
}

p { margin: 0; }

a {
  color: var(--cf-primary);
  text-decoration: none;
  transition: color .25s var(--cf-ease);
}
a:hover { color: var(--cf-primary-dark); }

img { display: block; max-width: 100%; }

::selection { background: var(--cf-gold); color: var(--cf-deep); }

/* 可见焦点，满足无障碍 */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 3px solid rgba(245, 166, 35, .65);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ==========================================================================
   03. 容器与栅格
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--cf-container);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--cf-gutter);
  padding-right: var(--cf-gutter);
}

.grid-2,
.grid-3,
.grid-4,
.grid-6 {
  display: grid;
  gap: 24px;
}
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }

/* ==========================================================================
   04. 调色板工具类
   ========================================================================== */
.bg-primary { background-color: var(--cf-primary) !important; }
.bg-primary-dark { background-color: var(--cf-primary-dark) !important; }
.bg-deep { background-color: var(--cf-deep) !important; }
.bg-gold { background-color: var(--cf-gold) !important; }
.bg-light { background-color: var(--cf-light) !important; }
.bg-white { background-color: var(--cf-white) !important; }

.text-primary { color: var(--cf-primary) !important; }
.text-primary-dark { color: var(--cf-primary-dark) !important; }
.text-deep { color: var(--cf-deep) !important; }
.text-gold { color: var(--cf-gold) !important; }
.text-muted { color: var(--cf-muted) !important; }
.text-ink { color: var(--cf-text) !important; }
.text-on-dark { color: rgba(255, 255, 255, .82) !important; }

.border-line { border: 1px solid var(--cf-border) !important; }
.border-top-line { border-top: 1px solid var(--cf-border); }
.border-bottom-line { border-bottom: 1px solid var(--cf-border); }

/* 占位符标记：需要客户补充的真实数据 */
.todo {
  display: inline-block;
  color: var(--cf-gold-dark);
  background: rgba(245, 166, 35, .14);
  border: 1px dashed rgba(245, 166, 35, .55);
  border-radius: 4px;
  padding: 0 6px;
  font-size: .92em;
  font-weight: 700;
  letter-spacing: .5px;
}

/* 小号装饰性英文副标题 */
.eyebrow {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cf-gold);
}
.eyebrow.on-light { color: var(--cf-primary); }

/* ==========================================================================
   05. 按钮
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  border-radius: var(--cf-radius-btn);
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: transform .25s var(--cf-ease), box-shadow .25s var(--cf-ease),
              background-color .25s var(--cf-ease), color .25s var(--cf-ease),
              border-color .25s var(--cf-ease);
}
.btn i { font-size: .95em; }
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--cf-primary);
  color: #fff;
  box-shadow: 0 8px 20px rgba(11, 79, 158, .24);
}
.btn-primary:hover {
  background: var(--cf-primary-dark);
  color: #fff;
  box-shadow: 0 14px 30px rgba(11, 79, 158, .34);
}

.btn-gold {
  background: var(--cf-gold);
  color: var(--cf-deep);
  box-shadow: 0 8px 20px rgba(245, 166, 35, .3);
}
.btn-gold:hover {
  background: var(--cf-gold-dark);
  color: var(--cf-deep);
  box-shadow: 0 14px 30px rgba(245, 166, 35, .42);
}

.btn-outline-light {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, .7);
}
.btn-outline-light:hover {
  background: #fff;
  color: var(--cf-deep);
  border-color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--cf-primary);
  border-color: var(--cf-primary);
}
.btn-outline:hover {
  background: var(--cf-primary);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  color: var(--cf-text);
  border-color: var(--cf-border);
}
.btn-ghost:hover {
  border-color: var(--cf-primary);
  color: var(--cf-primary);
}

.btn-lg { padding: 16px 34px; font-size: 16px; }
.btn-sm { padding: 10px 18px; font-size: 14px; }
.btn-block { width: 100%; }

/* 文字链接箭头 */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-weight: 600;
  font-size: 14px;
  color: var(--cf-primary);
}
.link-arrow i { transition: transform .25s var(--cf-ease); font-size: .85em; }
.link-arrow:hover i { transform: translateX(4px); }

/* ==========================================================================
   06. 顶部信息条
   ========================================================================== */
.topbar {
  background: var(--cf-deep);
  color: rgba(255, 255, 255, .82);
  font-size: 13px;
  line-height: 1;
}
.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 40px;
  padding-top: 10px;
  padding-bottom: 10px;
}
.topbar-left { display: flex; align-items: center; gap: 22px; }
.topbar-item { display: inline-flex; align-items: center; gap: 7px; white-space: nowrap; }
.topbar-item i { color: var(--cf-gold); font-size: 12px; }
.topbar-item a { color: inherit; }
.topbar-item a:hover { color: #fff; }
.topbar-right {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: rgba(255, 255, 255, .92);
}
.topbar-right i { color: var(--cf-gold); }
.topbar-right strong { color: #fff; font-weight: 600; }

/* ==========================================================================
   07. 页头 / 导航 / 移动端菜单
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 900;
  background: var(--cf-white);
  border-bottom: 1px solid var(--cf-border);
  transition: box-shadow .3s var(--cf-ease);
}
.site-header.is-stuck { box-shadow: 0 8px 30px rgba(15, 23, 42, .1); }

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: var(--cf-header-h);
}

/* 品牌 Logo */
.brand { display: inline-flex; align-items: center; gap: 12px; flex-shrink: 0; }
.brand:hover { color: inherit; }
.brand-logo { height: 46px; width: auto; display: block; flex-shrink: 0; }
.brand-text { display: flex; flex-direction: column; line-height: 1; }
.brand-cn {
  font-size: 21px;
  font-weight: 800;
  color: var(--cf-deep);
  letter-spacing: .06em;
}
.brand-en {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .34em;
  color: var(--cf-muted);
  margin-top: 5px;
}

/* 主导航 */
.main-nav { display: flex; align-items: center; gap: 4px; }
.nav-link {
  position: relative;
  display: inline-block;
  padding: 10px 15px;
  font-size: 15px;
  font-weight: 600;
  color: var(--cf-text);
  border-radius: 6px;
  transition: color .22s var(--cf-ease), background-color .22s var(--cf-ease);
}
.nav-link:hover { color: var(--cf-primary); background: var(--cf-light); }
.nav-link::after {
  content: "";
  position: absolute;
  left: 15px;
  right: 15px;
  bottom: 2px;
  height: 3px;
  border-radius: 2px;
  background: var(--cf-gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .28s var(--cf-ease);
}
.nav-link:hover::after,
.nav-link.is-active::after { transform: scaleX(1); }
.nav-link.is-active { color: var(--cf-primary); }

.nav-actions { display: flex; align-items: center; gap: 14px; flex-shrink: 0; }

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--cf-border);
  border-radius: 10px;
  background: var(--cf-white);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  transition: border-color .22s var(--cf-ease), background-color .22s var(--cf-ease);
}
.nav-toggle:hover { border-color: var(--cf-primary); }
.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--cf-deep);
  border-radius: 2px;
  transition: transform .3s var(--cf-ease), opacity .2s var(--cf-ease);
}
.nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 移动端下拉菜单 */
.mobile-menu {
  display: none;
  overflow: hidden;
  max-height: 0;
  visibility: hidden;
  background: var(--cf-white);
  border-top: 1px solid var(--cf-border);
  transition: max-height .38s var(--cf-ease), visibility 0s linear .38s;
}
.mobile-menu.is-open { max-height: 620px; visibility: visible; transition: max-height .38s var(--cf-ease), visibility 0s; }
.mobile-menu-inner { padding: 12px var(--cf-gutter) 22px; }
.mobile-nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 4px;
  font-size: 16px;
  font-weight: 600;
  color: var(--cf-text);
  border-bottom: 1px solid var(--cf-border);
}
.mobile-nav-link i { color: var(--cf-muted); font-size: 13px; }
.mobile-nav-link:hover,
.mobile-nav-link.is-active { color: var(--cf-primary); }
.mobile-menu .btn { margin-top: 18px; }

/* ==========================================================================
   08. Hero
   ========================================================================== */
.hero {
  position: relative;
  color: #fff;
  background: var(--cf-deep);
  overflow: hidden;
  isolation: isolate;
}
.hero-media {
  position: absolute;
  inset: 0;
  z-index: -2;
}
.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(100deg, rgba(7, 43, 82, .96) 0%, rgba(8, 58, 115, .88) 46%, rgba(11, 79, 158, .6) 100%);
}
/* 技术网格纹理 */
.hero-overlay::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .05) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(to right, #000 0%, transparent 78%);
  -webkit-mask-image: linear-gradient(to right, #000 0%, transparent 78%);
}

.hero-inner {
  padding-top: 104px;
  padding-bottom: 96px;
  max-width: 720px;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--cf-gold);
  margin-bottom: 22px;
}
.hero-eyebrow::before {
  content: "";
  width: 40px;
  height: 3px;
  background: var(--cf-gold);
  border-radius: 2px;
}
.hero h1 {
  font-size: 54px;
  line-height: 1.14;
  color: #fff;
  letter-spacing: .01em;
  margin-bottom: 22px;
}
.hero h1 .accent { color: var(--cf-gold); }
.hero-sub {
  font-size: 18px;
  line-height: 1.85;
  color: rgba(255, 255, 255, .86);
  max-width: 620px;
  margin-bottom: 36px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; }

/* Hero 底部能力条 */
.hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin-top: 64px;
  padding-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, .16);
}
.hero-fact {
  padding-right: 40px;
  margin-right: 40px;
  border-right: 1px solid rgba(255, 255, 255, .16);
}
.hero-fact:last-child { border-right: 0; margin-right: 0; padding-right: 0; }
.hero-fact-num {
  font-size: 30px;
  font-weight: 800;
  color: var(--cf-gold);
  line-height: 1.1;
  letter-spacing: .01em;
}
.hero-fact-label {
  font-size: 13px;
  color: rgba(255, 255, 255, .72);
  margin-top: 6px;
  letter-spacing: .04em;
}

/* ==========================================================================
   09. 区块与区块标题
   ========================================================================== */
.section { padding: 92px 0; }
.section-sm { padding: 64px 0; }
.section-light { background: var(--cf-light); }
.section-deep { background: var(--cf-deep); color: #fff; }
.section-deep h2,
.section-deep h3 { color: #fff; }
/* 深色区块内嵌的白底卡片：标题恢复深色，避免白字白底不可见 */
.section-deep .card h2,
.section-deep .card h3 { color: var(--cf-text); }

.section-head { max-width: 760px; margin-bottom: 52px; }
.section-head.is-center { margin-left: auto; margin-right: auto; text-align: center; }
.section-title {
  font-size: 36px;
  letter-spacing: .01em;
  margin-top: 12px;
}
.section-line {
  width: 48px;
  height: 4px;
  background: var(--cf-gold);
  border-radius: 2px;
  margin: 20px 0 22px;
}
.section-head.is-center .section-line { margin-left: auto; margin-right: auto; }
.section-sub {
  font-size: 16px;
  color: var(--cf-muted);
  line-height: 1.9;
}
.section-deep .section-sub { color: rgba(255, 255, 255, .74); }

/* ==========================================================================
   10. 卡片体系
   ========================================================================== */
.card {
  background: var(--cf-white);
  border: 1px solid var(--cf-border);
  border-radius: var(--cf-radius-card);
  box-shadow: var(--cf-shadow);
  transition: transform .32s var(--cf-ease), box-shadow .32s var(--cf-ease),
              border-color .32s var(--cf-ease);
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--cf-shadow-hover);
  border-color: rgba(11, 79, 158, .28);
}

/* 通用图标徽章 */
.icon-badge {
  width: 58px;
  height: 58px;
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: var(--cf-primary);
  background: rgba(11, 79, 158, .09);
  border: 1px solid rgba(11, 79, 158, .16);
  transition: background-color .3s var(--cf-ease), color .3s var(--cf-ease);
}
.card:hover .icon-badge { background: var(--cf-primary); color: #fff; }
.icon-badge.is-gold {
  color: var(--cf-gold-dark);
  background: rgba(245, 166, 35, .14);
  border-color: rgba(245, 166, 35, .3);
}
.card:hover .icon-badge.is-gold { background: var(--cf-gold); color: var(--cf-deep); }

/* 核心优势卡 */
.feature-card { padding: 34px 28px; }
.feature-card h3 { font-size: 19px; margin: 22px 0 10px; }
.feature-card p { font-size: 14.5px; color: var(--cf-muted); line-height: 1.85; }
.feature-card .tag-row { margin-top: 16px; display: flex; flex-wrap: wrap; gap: 8px; }

/* 小标签 */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--cf-primary-dark);
  background: rgba(11, 79, 158, .08);
  border: 1px solid rgba(11, 79, 158, .16);
  border-radius: 999px;
  line-height: 1.5;
}
.tag.is-gold {
  color: var(--cf-gold-dark);
  background: rgba(245, 166, 35, .13);
  border-color: rgba(245, 166, 35, .32);
}

/* 主营业务两大板块卡 */
.biz-card {
  position: relative;
  display: block;
  border-radius: var(--cf-radius-card);
  overflow: hidden;
  min-height: 380px;
  color: #fff;
  box-shadow: var(--cf-shadow);
  transition: transform .35s var(--cf-ease), box-shadow .35s var(--cf-ease);
}
.biz-card:hover { transform: translateY(-6px); box-shadow: var(--cf-shadow-deep); color: #fff; }
.biz-card img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .7s var(--cf-ease);
}
.biz-card:hover img { transform: scale(1.06); }
.biz-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(7, 43, 82, .95) 4%, rgba(7, 43, 82, .55) 48%, rgba(7, 43, 82, .18) 100%);
}
.biz-body {
  position: relative;
  z-index: 2;
  height: 100%;
  min-height: 380px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 34px 32px;
}
.biz-kicker {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cf-gold);
  margin-bottom: 12px;
}
.biz-card h3 { font-size: 25px; color: #fff; margin-bottom: 12px; }
.biz-card p { font-size: 14.5px; color: rgba(255, 255, 255, .84); line-height: 1.85; margin-bottom: 18px; }
.biz-list { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 22px; }
.biz-list .tag {
  color: #fff;
  background: rgba(255, 255, 255, .12);
  border-color: rgba(255, 255, 255, .3);
}
.biz-more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--cf-gold);
}
.biz-more i { transition: transform .25s var(--cf-ease); font-size: .85em; }
.biz-card:hover .biz-more i { transform: translateX(5px); }

/* 设备 / 产品卡 */
.product-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--cf-white);
  border: 1px solid var(--cf-border);
  border-radius: var(--cf-radius-card);
  box-shadow: var(--cf-shadow);
  transition: transform .32s var(--cf-ease), box-shadow .32s var(--cf-ease),
              border-color .32s var(--cf-ease);
}
.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--cf-shadow-hover);
  border-color: rgba(11, 79, 158, .28);
}
.product-thumb {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--cf-light);
}
.product-thumb.is-square { aspect-ratio: 1 / 1; }
.product-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .6s var(--cf-ease);
}
.product-card:hover .product-thumb img { transform: scale(1.07); }
.product-thumb::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(7, 43, 82, .18), transparent 46%);
  opacity: 0;
  transition: opacity .35s var(--cf-ease);
}
.product-card:hover .product-thumb::after { opacity: 1; }
.product-badge {
  position: absolute;
  top: 14px;
  left: 14px;
  z-index: 2;
  padding: 5px 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--cf-deep);
  background: var(--cf-gold);
  border-radius: 999px;
}
.product-body { padding: 24px 24px 26px; display: flex; flex-direction: column; flex: 1; }
.product-body h3 { font-size: 19px; margin-bottom: 10px; }
.product-body p {
  font-size: 14px;
  color: var(--cf-muted);
  line-height: 1.8;
  margin-bottom: 16px;
  flex: 1;
}
.product-specs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }

/* 行业卡 */
.industry-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 32px 20px;
  background: var(--cf-white);
  border: 1px solid var(--cf-border);
  border-radius: var(--cf-radius-card);
  box-shadow: var(--cf-shadow);
  transition: transform .3s var(--cf-ease), box-shadow .3s var(--cf-ease),
              border-color .3s var(--cf-ease);
}
.industry-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--cf-shadow-hover);
  border-color: rgba(11, 79, 158, .28);
}
.industry-card .icon-badge { margin-bottom: 18px; }
.industry-card h3 { font-size: 17px; margin-bottom: 8px; }
.industry-card p { font-size: 13.5px; color: var(--cf-muted); line-height: 1.7; }

/* 为什么选择我们：图文分栏 */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.split-media {
  position: relative;
  border-radius: var(--cf-radius-card);
  overflow: hidden;
  box-shadow: var(--cf-shadow-deep);
}
.split-media img { width: 100%; height: 100%; min-height: 420px; object-fit: cover; }
.split-media .media-badge {
  position: absolute;
  left: 24px;
  bottom: 24px;
  padding: 18px 22px;
  background: rgba(7, 43, 82, .9);
  border-left: 4px solid var(--cf-gold);
  border-radius: 10px;
  color: #fff;
  backdrop-filter: blur(4px);
}
.split-media .media-badge strong {
  display: block;
  font-size: 22px;
  color: var(--cf-gold);
  line-height: 1.2;
}
.split-media .media-badge span { font-size: 13px; color: rgba(255, 255, 255, .8); }

.why-item {
  display: flex;
  gap: 18px;
  padding: 20px 0;
  border-bottom: 1px solid var(--cf-border);
}
.why-item:last-child { border-bottom: 0; }
.why-item .icon-badge { flex-shrink: 0; width: 52px; height: 52px; font-size: 21px; }
.why-item h3 { font-size: 17.5px; margin-bottom: 6px; }
.why-item p { font-size: 14px; color: var(--cf-muted); line-height: 1.8; }

/* 服务流程步骤（供 about.html 复用） */
.process-step {
  position: relative;
  padding: 30px 26px;
  background: var(--cf-white);
  border: 1px solid var(--cf-border);
  border-radius: var(--cf-radius-card);
  box-shadow: var(--cf-shadow);
}
.process-step .step-no {
  font-size: 40px;
  font-weight: 800;
  line-height: 1;
  color: rgba(11, 79, 158, .16);
  letter-spacing: .02em;
}
.process-step h3 { font-size: 18px; margin: 14px 0 8px; }
.process-step p { font-size: 14px; color: var(--cf-muted); line-height: 1.8; }

/* ==========================================================================
   11. 数据统计区
   ========================================================================== */
.stats-band {
  background: var(--cf-deep);
  color: #fff;
  position: relative;
  overflow: hidden;
}
.stats-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .04) 1px, transparent 1px);
  background-size: 56px 56px;
  pointer-events: none;
}
.stats-grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}
.stat {
  text-align: center;
  padding: 12px 16px;
  border-right: 1px solid rgba(255, 255, 255, .14);
}
.stat:last-child { border-right: 0; }
.stat-num {
  font-size: 46px;
  font-weight: 800;
  color: var(--cf-gold);
  line-height: 1.05;
  letter-spacing: .01em;
}
.stat-num .stat-unit {
  font-size: .46em;
  font-weight: 700;
  margin-left: 4px;
  letter-spacing: .02em;
}
.stat-label {
  font-size: 14.5px;
  color: rgba(255, 255, 255, .82);
  margin-top: 10px;
  letter-spacing: .03em;
}

/* ==========================================================================
   12. 参数表
   ========================================================================== */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--cf-border);
  border-radius: var(--cf-radius-card);
  background: var(--cf-white);
  box-shadow: var(--cf-shadow);
  -webkit-overflow-scrolling: touch;
}
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
  min-width: 560px;
}
.spec-table thead th {
  background: var(--cf-deep);
  color: #fff;
  font-weight: 600;
  text-align: left;
  padding: 15px 20px;
  white-space: nowrap;
  letter-spacing: .02em;
}
.spec-table tbody td {
  padding: 13px 20px;
  border-bottom: 1px solid var(--cf-border);
  color: var(--cf-text);
  vertical-align: top;
}
.spec-table tbody tr:last-child td { border-bottom: 0; }
.spec-table tbody tr:nth-child(even) { background: var(--cf-light); }
.spec-table tbody tr:hover { background: rgba(11, 79, 158, .05); }
.spec-table td:first-child,
.spec-table th:first-child { font-weight: 600; }
.spec-table .spec-key { color: var(--cf-muted); font-weight: 500; }

/* ==========================================================================
   13. 服务承诺条
   ========================================================================== */
.service-bar {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  background: var(--cf-white);
  border: 1px solid var(--cf-border);
  border-radius: var(--cf-radius-card);
  box-shadow: var(--cf-shadow);
  overflow: hidden;
}
.service-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 28px 26px;
  border-right: 1px solid var(--cf-border);
  transition: background-color .3s var(--cf-ease);
}
.service-item:last-child { border-right: 0; }
.service-item:hover { background: var(--cf-light); }
.service-item .icon-badge { width: 50px; height: 50px; font-size: 20px; flex-shrink: 0; }
.service-item h3 { font-size: 16.5px; margin-bottom: 4px; }
.service-item p { font-size: 13px; color: var(--cf-muted); line-height: 1.6; }

/* ==========================================================================
   14. 底部 CTA
   ========================================================================== */
.cta-band {
  position: relative;
  overflow: hidden;
  background: linear-gradient(115deg, var(--cf-primary) 0%, var(--cf-primary-dark) 52%, var(--cf-deep) 100%);
  color: #fff;
  border-radius: var(--cf-radius-card);
  padding: 56px 60px;
  box-shadow: var(--cf-shadow-deep);
}
.cta-band::after {
  content: "";
  position: absolute;
  right: -80px;
  top: -80px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(245, 166, 35, .28), transparent 68%);
  pointer-events: none;
}
.cta-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
}
.cta-inner h2 { font-size: 32px; color: #fff; margin-bottom: 12px; }
.cta-inner p { font-size: 16px; color: rgba(255, 255, 255, .86); max-width: 560px; }
.cta-actions { display: flex; gap: 14px; flex-wrap: wrap; flex-shrink: 0; }

/* ==========================================================================
   15. 页脚
   ========================================================================== */
.site-footer {
  background: var(--cf-deep);
  color: rgba(255, 255, 255, .72);
  font-size: 14px;
  margin-top: 92px;
}
.footer-main {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 48px;
  padding: 72px 0 52px;
}
.footer-brand { display: inline-flex; align-items: center; gap: 12px; margin-bottom: 20px; }
.footer-brand .brand-cn { color: #fff; }
.footer-brand .brand-en { color: rgba(255, 255, 255, .55); }
.footer-about p { line-height: 1.9; color: rgba(255, 255, 255, .7); margin-bottom: 20px; }
.footer-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.footer-tags .tag {
  color: rgba(255, 255, 255, .85);
  background: rgba(255, 255, 255, .08);
  border-color: rgba(255, 255, 255, .16);
}
.footer-col h3 {
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 22px;
  padding-bottom: 14px;
  position: relative;
}
.footer-col h3::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 32px;
  height: 3px;
  background: var(--cf-gold);
  border-radius: 2px;
}
.footer-links { list-style: none; margin: 0; padding: 0; }
.footer-links li { margin-bottom: 12px; }
.footer-links a {
  color: rgba(255, 255, 255, .72);
  display: inline-flex;
  align-items: center;
  gap: 9px;
  transition: color .22s var(--cf-ease), transform .22s var(--cf-ease);
}
.footer-links a i { font-size: 10px; color: var(--cf-gold); transition: transform .22s var(--cf-ease); }
.footer-links a:hover { color: #fff; }
.footer-links a:hover i { transform: translateX(3px); }

.footer-contact { list-style: none; margin: 0; padding: 0; }
.footer-contact li {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
  line-height: 1.7;
  color: rgba(255, 255, 255, .72);
}
.footer-contact li i {
  color: var(--cf-gold);
  width: 18px;
  text-align: center;
  margin-top: 4px;
  flex-shrink: 0;
}
.footer-contact .todo {
  color: var(--cf-gold);
  background: rgba(245, 166, 35, .14);
  border-color: rgba(245, 166, 35, .45);
}
.footer-contact a { color: inherit; }
.footer-contact a:hover { color: var(--cf-gold); }

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, .12);
  padding: 24px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 13px;
  color: rgba(255, 255, 255, .58);
}
.footer-bottom a { color: rgba(255, 255, 255, .72); }
.footer-bottom a:hover { color: #fff; }
.footer-bottom .divider { margin: 0 10px; opacity: .4; }

/* ==========================================================================
   16. 返回顶部
   ========================================================================== */
.back-to-top {
  position: fixed;
  right: 26px;
  bottom: 26px;
  z-index: 950;
  width: 48px;
  height: 48px;
  border: 0;
  border-radius: 12px;
  background: var(--cf-primary);
  color: #fff;
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 26px rgba(11, 79, 158, .38);
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: opacity .3s var(--cf-ease), transform .3s var(--cf-ease),
              visibility .3s var(--cf-ease), background-color .3s var(--cf-ease);
}
.back-to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--cf-gold); color: var(--cf-deep); }

/* ==========================================================================
   17. 工具类 / 动效
   ========================================================================== */
.text-center { text-align: center; }
.mt-0 { margin-top: 0 !important; }
.mt-24 { margin-top: 24px; }
.mt-40 { margin-top: 40px; }
.mt-56 { margin-top: 56px; }
.mb-0 { margin-bottom: 0 !important; }

/* 仅在 JS 可用时隐藏，保证无 JS 时内容依然可见（渐进增强） */
.has-js .reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity .7s var(--cf-ease), transform .7s var(--cf-ease);
}
.has-js .reveal.is-visible { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: .08s; }
.reveal[data-delay="2"] { transition-delay: .16s; }
.reveal[data-delay="3"] { transition-delay: .24s; }
.reveal[data-delay="4"] { transition-delay: .32s; }

/* 表单（contact.html 复用） */
.form-field { margin-bottom: 20px; }
.form-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--cf-text);
  margin-bottom: 8px;
}
.form-label .req { color: #DC2626; margin-left: 2px; }
.form-control {
  width: 100%;
  padding: 12px 15px;
  font-size: 15px;
  font-family: var(--cf-font);
  color: var(--cf-text);
  background: var(--cf-white);
  border: 1px solid var(--cf-border);
  border-radius: var(--cf-radius-btn);
  transition: border-color .22s var(--cf-ease), box-shadow .22s var(--cf-ease);
}
.form-control::placeholder { color: #94A3B8; }
.form-control:focus {
  outline: none;
  border-color: var(--cf-primary);
  box-shadow: 0 0 0 3px rgba(11, 79, 158, .14);
}
.form-control.is-invalid {
  border-color: #DC2626;
  box-shadow: 0 0 0 3px rgba(220, 38, 38, .12);
}
.form-error { display: none; color: #DC2626; font-size: 13px; margin-top: 6px; }
.form-error.is-shown { display: block; }
.form-note { font-size: 13px; color: var(--cf-muted); }
.form-success {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  background: rgba(16, 185, 129, .1);
  border: 1px solid rgba(16, 185, 129, .35);
  border-radius: var(--cf-radius-btn);
  color: #047857;
  font-size: 14.5px;
  font-weight: 600;
}
.form-success.is-shown { display: flex; }
.form-success i { color: #10B981; }

/* 面包屑 / 页内锚点导航（子页复用） */
.page-hero {
  background: linear-gradient(115deg, var(--cf-primary) 0%, var(--cf-deep) 100%);
  color: #fff;
  padding: 64px 0;
}
.page-hero h1 { color: #fff; font-size: 38px; margin-bottom: 12px; }
.page-hero p { color: rgba(255, 255, 255, .82); max-width: 720px; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* 跳转到主内容（键盘可达，聚焦时显示） */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 2000;
  padding: 10px 18px;
  background: var(--cf-deep);
  color: #fff;
  border-radius: var(--cf-radius-btn);
  font-size: 14px;
  font-weight: 600;
  transform: translateY(-160%);
  transition: transform .25s var(--cf-ease);
}
.skip-link:focus { transform: translateY(0); color: #fff; }

/* ==========================================================================
   18. 响应式
   ========================================================================== */
/* 大屏收紧 */
@media (max-width: 1280px) {
  .hero h1 { font-size: 48px; }
  .split { gap: 40px; }
}

/* 平板：768 – 1024 */
@media (max-width: 1024px) {
  .section { padding: 72px 0; }
  .section-title { font-size: 30px; }
  .hero h1 { font-size: 42px; }
  .hero-inner { padding-top: 84px; padding-bottom: 76px; }

  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-6 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .stats-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 36px 24px; }
  .stat:nth-child(2) { border-right: 0; }
  .stat { border-right: 0; }

  .service-bar { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .service-item:nth-child(2) { border-right: 0; }
  .service-item:nth-child(-n+2) { border-bottom: 1px solid var(--cf-border); }

  .split { grid-template-columns: 1fr; gap: 36px; }
  .split-media { order: -1; }
  .split-media img { min-height: 340px; }

  .footer-main { grid-template-columns: 1fr 1fr; gap: 40px; padding: 56px 0 40px; }

  .cta-band { padding: 46px 40px; }
  .cta-inner h2 { font-size: 27px; }

  /* 平板起隐藏桌面导航，启用汉堡 */
  .main-nav { display: none; }
  .nav-toggle { display: flex; }
  .mobile-menu { display: block; }
  .nav-actions .btn { display: none; }
}

/* 手机：< 768 */
@media (max-width: 767px) {
  :root { --cf-gutter: 16px; --cf-header-h: 64px; }

  body { font-size: 15px; }
  .section { padding: 56px 0; }
  .section-sm { padding: 44px 0; }
  .section-head { margin-bottom: 36px; }
  .section-title { font-size: 25px; }
  .section-sub { font-size: 15px; }
  .section-line { margin: 16px 0 18px; }

  /* 顶部信息条：仅保留服务承诺 */
  .topbar-inner { justify-content: center; min-height: 36px; padding: 8px 0; }
  .topbar-left { display: none; }
  .topbar-right { font-size: 12px; }

  .brand-logo { height: 40px; }
  .brand-cn { font-size: 18px; }
  .brand-en { font-size: 9px; letter-spacing: .28em; margin-top: 4px; }

  .hero-inner { padding-top: 60px; padding-bottom: 56px; }
  .hero h1 { font-size: 31px; margin-bottom: 18px; }
  .hero-sub { font-size: 15.5px; line-height: 1.8; margin-bottom: 28px; }
  .hero-actions { gap: 12px; }
  .hero-actions .btn { flex: 1 1 auto; }
  .hero-facts { margin-top: 42px; padding-top: 22px; gap: 0; }
  .hero-fact {
    flex: 1 1 50%;
    padding: 12px 0;
    margin: 0;
    border-right: 0;
    border-bottom: 1px solid rgba(255, 255, 255, .14);
  }
  .hero-fact:nth-child(odd) { padding-right: 14px; }
  .hero-fact:nth-last-child(-n+2) { border-bottom: 0; }
  .hero-fact-num { font-size: 24px; }

  .grid-2, .grid-3, .grid-4, .grid-6 { grid-template-columns: 1fr; gap: 18px; }
  .grid-6 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .feature-card { padding: 26px 22px; }
  .biz-body { min-height: 320px; padding: 26px 24px; }
  .biz-card h3 { font-size: 21px; }

  .stats-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px 16px; }
  .stat { padding: 8px; }
  .stat-num { font-size: 34px; }
  .stat-label { font-size: 13px; }

  .service-bar { grid-template-columns: 1fr; }
  .service-item { border-right: 0; border-bottom: 1px solid var(--cf-border); padding: 22px 20px; }
  .service-item:nth-child(-n+2) { border-bottom: 1px solid var(--cf-border); }
  .service-item:last-child { border-bottom: 0; }

  .why-item { padding: 16px 0; }
  .why-item .icon-badge { width: 46px; height: 46px; font-size: 18px; }

  .cta-band { padding: 34px 24px; border-radius: 14px; }
  .cta-inner { gap: 24px; }
  .cta-inner h2 { font-size: 23px; }
  .cta-actions { width: 100%; }
  .cta-actions .btn { flex: 1 1 auto; }

  .footer-main { grid-template-columns: 1fr; gap: 34px; padding: 46px 0 32px; }
  .footer-bottom { flex-direction: column; text-align: center; gap: 10px; }

  .back-to-top { right: 16px; bottom: 16px; width: 44px; height: 44px; }
}

/* 动画降级 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    transition-duration: .001ms !important;
  }
  .has-js .reveal { opacity: 1; transform: none; }
}