/* ==========================================================================
   ZC Network (zcnetwork.com) 企业官网 - 全局样式
   --------------------------------------------------------------------------
   风格：蓝色商务风 / Blue corporate style
   结构：1.变量与基础 2.布局容器 3.按钮 4.顶部导航 5.页脚 6.通用区块与组件
        7.首页 8.公司介绍 9.解决方案 10.联系我们 11.响应式
   说明：纯 CSS，无预处理器、无框架；所有图片均为 assets/images 下的可替换占位素材
   ========================================================================== */

/* ------------------------------ 1. 变量与基础 ------------------------------ */
:root {
  /* 品牌蓝 */
  --blue-900: #062f63;
  --blue-800: #083a7c;
  --blue-700: #0b4fa8;
  --blue-600: #1266d6;
  --blue-500: #1f8bff;
  --blue-200: #bcd8f8;
  --blue-100: #e6f0fb;
  --blue-050: #f3f8fe;

  /* 文字与背景 */
  --ink: #16263a;
  --ink-2: #3d4f63;
  --muted: #6b7c90;
  --line: #dce6f1;
  --white: #ffffff;
  --bg-soft: #f5f9fd;

  /* 尺寸与效果 */
  --radius: 14px;
  --radius-sm: 8px;
  --shadow-sm: 0 4px 14px rgba(11, 79, 168, 0.08);
  --shadow: 0 10px 30px rgba(11, 79, 168, 0.10);
  --shadow-lg: 0 18px 46px rgba(11, 79, 168, 0.16);
  --maxw: 1200px;
  --nav-h: 72px;
  --transition: 0.25s ease;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Helvetica Neue", Helvetica, "PingFang SC", "Microsoft YaHei",
    "Hiragino Sans GB", Arial, sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--blue-700); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--blue-500); }

h1, h2, h3, h4 {
  margin: 0 0 16px;
  line-height: 1.3;
  font-weight: 700;
  color: var(--blue-900);
}

h1 { font-size: 40px; }
h2 { font-size: 32px; }
h3 { font-size: 22px; }
h4 { font-size: 18px; }

p { margin: 0 0 14px; color: var(--ink-2); }

ul { margin: 0; padding-left: 20px; }
li { color: var(--ink-2); margin-bottom: 8px; }

/* 英文模式下使用无衬线英文字体优先 */
html[lang="en"] body {
  font-family: "Helvetica Neue", Helvetica, Arial, "Segoe UI", sans-serif;
}

/* ------------------------------ 2. 布局容器 ------------------------------ */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 84px 0; }
.section--soft { background: var(--bg-soft); }
.section--blue { background: linear-gradient(135deg, var(--blue-800), var(--blue-600)); }
.section--blue h2,
.section--blue h3,
.section--blue p,
.section--blue li { color: #eaf2fc; }

/* 区块标题（居中） */
.section-head {
  max-width: 720px;
  margin: 0 auto 48px;
  text-align: center;
}

.section-tag {
  display: inline-block;
  padding: 4px 14px;
  margin-bottom: 14px;
  border-radius: 999px;
  background: var(--blue-100);
  color: var(--blue-700);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.section--blue .section-tag {
  background: rgba(255, 255, 255, 0.16);
  color: #ffffff;
}

.section-desc { font-size: 16px; color: var(--muted); }

/* 通用网格 */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ------------------------------ 3. 按钮 ------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--blue-700);
  color: #ffffff;
  box-shadow: 0 8px 20px rgba(11, 79, 168, 0.24);
}
.btn-primary:hover {
  background: var(--blue-600);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 12px 26px rgba(11, 79, 168, 0.32);
}

.btn-outline {
  background: transparent;
  border-color: var(--blue-700);
  color: var(--blue-700);
}
.btn-outline:hover { background: var(--blue-700); color: #ffffff; }

.btn-light {
  background: #ffffff;
  color: var(--blue-700);
}
.btn-light:hover { background: var(--blue-050); color: var(--blue-700); }

.btn-ghost {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.5);
  color: #ffffff;
}
.btn-ghost:hover { background: #ffffff; color: var(--blue-700); }

.btn[disabled] { opacity: 0.7; cursor: not-allowed; transform: none; }

.btn-row { display: flex; flex-wrap: wrap; gap: 14px; }

/* 文本链接箭头 */
.link-arrow { font-weight: 600; }
.link-arrow::after { content: " →"; }

/* ------------------------------ 4. 顶部导航 ------------------------------ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow var(--transition);
}
.site-header.is-scrolled { box-shadow: var(--shadow-sm); }

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

.brand { display: flex; align-items: center; gap: 10px; }
.brand-logo { width: 38px; height: 38px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text strong { font-size: 17px; color: var(--blue-900); }
.brand-text small { font-size: 12px; color: var(--muted); }

.main-nav .nav-list {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  display: block;
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}
.nav-link:hover { color: var(--blue-700); background: var(--blue-050); }
.nav-link.is-active { color: var(--blue-700); background: var(--blue-100); }

.header-actions { display: flex; align-items: center; gap: 12px; }

/* 语言切换（全站统一入口） */
.lang-switch {
  display: inline-flex;
  padding: 3px;
  border-radius: 999px;
  background: var(--blue-100);
  border: 1px solid var(--blue-200);
}
.lang-btn {
  padding: 5px 14px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--blue-700);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
}
.lang-btn.is-active {
  background: var(--blue-700);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

/* 移动端汉堡按钮 */
.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--white);
  cursor: pointer;
  padding: 0;
}
.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: var(--blue-900);
  transition: var(--transition);
}
.nav-toggle.is-open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ------------------------------ 5. 页脚 ------------------------------ */
.site-footer {
  background: var(--blue-900);
  color: #cfe0f5;
  padding: 64px 0 0;
  font-size: 14px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
}

.footer-col h4 {
  color: #ffffff;
  font-size: 16px;
  margin-bottom: 16px;
}

.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.footer-brand img { width: 34px; height: 34px; }
.footer-brand strong { color: #ffffff; font-size: 17px; }

.footer-col p,
.footer-col li { color: #cfe0f5; }

.footer-links { list-style: none; padding: 0; }
.footer-links li { margin-bottom: 10px; }
.footer-links a { color: #cfe0f5; }
.footer-links a:hover { color: #ffffff; }

.footer-domain {
  display: inline-block;
  margin-top: 10px;
  padding: 4px 12px;
  border: 1px dashed rgba(255, 255, 255, 0.35);
  border-radius: 999px;
  color: #ffffff;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.footer-qr {
  width: 96px;
  height: 96px;
  border-radius: var(--radius-sm);
  background: #ffffff;
  padding: 6px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  padding: 18px 0;
}
.footer-bottom .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.footer-bottom p { margin: 0; font-size: 13px; color: #a9c2e2; }
.footer-icp a { color: #a9c2e2; }
.footer-icp a:hover { color: #ffffff; }

/* ------------------------------ 6. 通用区块与组件 ------------------------------ */

/* 页面内页头（内页共用） */
.page-hero {
  position: relative;
  padding: 96px 0 72px;
  background: linear-gradient(120deg, var(--blue-900) 0%, var(--blue-700) 60%, var(--blue-600) 100%);
  overflow: hidden;
}
.page-hero::after {
  content: "";
  position: absolute;
  right: -120px;
  top: -80px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.07);
}
.page-hero .container { position: relative; z-index: 1; }
.page-hero h1 { color: #ffffff; max-width: 760px; }
.page-hero p { color: #d7e7fa; font-size: 17px; max-width: 680px; }
.page-hero .section-tag { background: rgba(255, 255, 255, 0.16); color: #ffffff; }

/* 内页头配图版：图片路径写在本文件内（相对 style.css 解析），HTML 只加类名 */
.page-hero--media {
  background-image: linear-gradient(115deg,
      rgba(4, 20, 45, 0.93) 0%,
      rgba(8, 58, 124, 0.76) 45%,
      rgba(18, 102, 214, 0.34) 100%),
    var(--ph-img, none);
  background-size: cover, cover;
  background-position: center, center;
  background-repeat: no-repeat, no-repeat;
}
.page-hero--media::after { background: rgba(255, 255, 255, 0.05); }

/* 各内页页头对应的配图 */
.page-hero--about { --ph-img: url("../images/page-hero-about.jpg"); }
.page-hero--solutions { --ph-img: url("../images/page-hero-solutions.jpg"); }
.page-hero--contact { --ph-img: url("../images/page-hero-contact.jpg"); }

/* 面包屑 */
.crumbs { font-size: 13px; color: #b9d2f0; margin-bottom: 12px; }
.crumbs a { color: #dceafb; }
.crumbs span { margin: 0 6px; opacity: 0.6; }

/* 卡片 */
.card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  transition: all var(--transition);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: var(--blue-200);
}
.card h3, .card h4 { margin-bottom: 10px; }
.card p:last-child { margin-bottom: 0; }

.card-icon {
  width: 52px;
  height: 52px;
  margin-bottom: 16px;
  border-radius: 12px;
  background: var(--blue-100);
  display: flex;
  align-items: center;
  justify-content: center;
}
.card-icon img { width: 26px; height: 26px; }

/* 统计数字 */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.stat-item { text-align: center; padding: 12px 8px; }
.stat-num {
  font-size: 40px;
  font-weight: 800;
  color: var(--blue-700);
  line-height: 1.1;
}
.stat-label { font-size: 14px; color: var(--muted); margin-top: 6px; }
.section--blue .stat-num { color: #ffffff; }
.section--blue .stat-label { color: #cfe0f5; }

/* 为什么选择我们（首页第 6 屏） */
.why-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.why-item {
  position: relative;
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 4px solid var(--blue-600);
  border-radius: var(--radius);
  padding: 26px 30px;
  overflow: hidden;
  transition: all var(--transition);
}
.why-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: var(--blue-200);
  border-left-color: var(--blue-700);
}
/* 右上角大号序号，纯装饰 */
.why-num {
  position: absolute;
  right: 16px;
  top: 6px;
  font-size: 56px;
  font-weight: 800;
  line-height: 1;
  color: var(--blue-050);
  pointer-events: none;
  user-select: none;
}
.why-item h3 { position: relative; margin-bottom: 10px; }
.why-item p { position: relative; margin-bottom: 0; color: var(--muted); }

/* 行动引导条 */
.cta-bar {
  border-radius: 18px;
  padding: 48px;
  background: linear-gradient(120deg, var(--blue-800), var(--blue-600));
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}
.cta-bar h2 { color: #ffffff; margin-bottom: 8px; }
.cta-bar p { color: #d7e7fa; margin-bottom: 0; }

/* 滚动出现动画 */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.is-visible { opacity: 1; transform: none; }

/* ------------------------------ 7. 首页 ------------------------------ */
.hero {
  position: relative;
  min-height: 620px;
  display: flex;
  align-items: center;
  background: linear-gradient(120deg, #041f42 0%, var(--blue-800) 45%, var(--blue-600) 100%);
  overflow: hidden;
}
.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-media img { width: 100%; height: 100%; object-fit: cover; }
/* 图片之上的蓝色遮罩，保证左侧标题与按钮的可读性 */
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background: linear-gradient(100deg,
    rgba(4, 20, 45, 0.94) 0%,
    rgba(6, 47, 99, 0.80) 40%,
    rgba(18, 102, 214, 0.34) 100%);
}
.hero .container { position: relative; z-index: 1; }
.hero-content { max-width: 640px; padding: 96px 0; }
.hero h1 { color: #ffffff; font-size: 46px; }
.hero-sub { color: #d7e7fa; font-size: 18px; margin-bottom: 28px; }
.hero .section-tag { background: rgba(255, 255, 255, 0.16); color: #ffffff; }
.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
  list-style: none;
  padding: 0;
}
.hero-badges li {
  padding: 5px 14px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 999px;
  color: #eaf2fc;
  font-size: 13px;
  margin: 0;
}

/* 首页简介 */
.about-summary { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.about-summary-media img {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.check-list { list-style: none; padding: 0; margin: 20px 0 26px; }
.check-list li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 10px;
}
.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 14px;
  height: 8px;
  border-left: 2px solid var(--blue-600);
  border-bottom: 2px solid var(--blue-600);
  transform: rotate(-45deg);
}

/* ------------------------------ 8. 公司介绍 ------------------------------ */
.timeline {
  position: relative;
  margin-top: 20px;
  padding-left: 28px;
  border-left: 2px solid var(--blue-200);
}
.timeline-item { position: relative; padding-bottom: 32px; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: "";
  position: absolute;
  left: -37px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--blue-700);
  border: 3px solid var(--white);
  box-shadow: 0 0 0 3px var(--blue-100);
}
.timeline-year {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  color: var(--blue-700);
  background: var(--blue-100);
  padding: 2px 12px;
  border-radius: 999px;
  margin-bottom: 8px;
}
.timeline-item h3 { font-size: 19px; margin-bottom: 6px; }

/* 资质标签 */
.cert-list { display: flex; flex-wrap: wrap; gap: 12px; list-style: none; padding: 0; }
.cert-list li {
  margin: 0;
  padding: 8px 18px;
  border: 1px solid var(--blue-200);
  border-radius: 999px;
  background: var(--blue-050);
  color: var(--blue-800);
  font-weight: 600;
  font-size: 14px;
}

/* 团队 */
.team-card { text-align: center; padding: 28px 20px; }
.team-avatar {
  width: 96px;
  height: 96px;
  margin: 0 auto 14px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid var(--blue-100);
}
.team-avatar img { width: 100%; height: 100%; object-fit: cover; }
.team-role { color: var(--blue-600); font-size: 14px; font-weight: 600; margin-bottom: 8px; }

/* 文化 */
.culture-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.culture-item {
  padding: 26px;
  border-left: 4px solid var(--blue-600);
  background: var(--blue-050);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.culture-item h4 { margin-bottom: 8px; }
.culture-item p:last-child { margin-bottom: 0; }

/* ------------------------------ 9. 解决方案 ------------------------------ */
.solution-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}
.solution-card:hover { box-shadow: var(--shadow); transform: translateY(-4px); }
.solution-media { height: 160px; overflow: hidden; background: var(--blue-100); }
.solution-media img { width: 100%; height: 100%; object-fit: cover; }
.solution-body { padding: 24px; }
.solution-body h3 { font-size: 20px; }
.solution-block { margin-top: 16px; }
.solution-block > strong {
  display: block;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--blue-700);
  text-transform: uppercase;
  margin-bottom: 6px;
}
.solution-block p { margin: 0; font-size: 15px; }
.solution-block ul { margin: 0; padding-left: 18px; font-size: 15px; }
.solution-block li { margin-bottom: 4px; }
.solution-value {
  margin-top: 16px;
  padding: 12px 16px;
  background: var(--blue-050);
  border-radius: var(--radius-sm);
  font-size: 15px;
  color: var(--blue-800);
}

/* 流程步骤 */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: step; }
.step { position: relative; padding: 28px 22px; background: var(--white); border-radius: var(--radius); border: 1px solid var(--line); }
.step::before {
  counter-increment: step;
  content: counter(step);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-bottom: 14px;
  border-radius: 50%;
  background: var(--blue-700);
  color: #ffffff;
  font-weight: 800;
}
.step h4 { margin-bottom: 6px; }
.step p { margin: 0; font-size: 15px; }

/* ------------------------------ 10. 联系我们 ------------------------------ */
.contact-wrap { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 44px; align-items: start; }

.contact-info .card { margin-bottom: 16px; display: flex; gap: 14px; align-items: flex-start; }
.contact-info .card:hover { transform: none; }
.contact-ico { width: 26px; height: 26px; flex: 0 0 26px; }
.contact-info h4 { margin-bottom: 4px; font-size: 16px; }
.contact-info p { margin: 0; }

.contact-form {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 36px;
  box-shadow: var(--shadow-sm);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { margin-bottom: 18px; }
.field label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 6px;
}
.field label .req { color: #d93b3b; margin-left: 2px; }
.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-family: inherit;
  color: var(--ink);
  background: var(--white);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.field textarea { min-height: 120px; resize: vertical; }
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--blue-600);
  box-shadow: 0 0 0 3px rgba(18, 102, 214, 0.14);
}
.field.has-error input,
.field.has-error textarea,
.field.has-error select { border-color: #d93b3b; }
.field-error {
  display: none;
  margin-top: 6px;
  font-size: 13px;
  color: #d93b3b;
}
.field.has-error .field-error { display: block; }

.consent { display: flex; align-items: flex-start; gap: 10px; font-size: 14px; }
.consent input { width: 16px; height: 16px; margin-top: 4px; flex: 0 0 16px; }
.consent label { font-weight: 400; color: var(--ink-2); margin: 0; }

.form-actions { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin-top: 8px; }

/* 提交按钮 loading 状态 */
.btn .spinner {
  display: none;
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255, 255, 255, 0.45);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
.btn.is-loading .spinner { display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }

/* 表单反馈 */
.form-alert {
  display: none;
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  border: 1px solid transparent;
}
.form-alert.is-show { display: block; }
.form-alert.is-success {
  background: #eaf7ee;
  border-color: #b6e0c2;
  color: #1c6b38;
}
.form-alert.is-error {
  background: #fdecec;
  border-color: #f5c2c2;
  color: #a52a2a;
}

/* 地图占位 */
.map-placeholder {
  margin-top: 20px;
  border: 1px dashed var(--blue-200);
  border-radius: var(--radius);
  background: var(--blue-050);
  overflow: hidden;
}

/* ------------------------------ 11. 响应式 ------------------------------ */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .why-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .culture-grid { grid-template-columns: 1fr 1fr; }
  .contact-wrap { grid-template-columns: 1fr; }
  .hero h1 { font-size: 38px; }
}

@media (max-width: 860px) {
  .nav-toggle { display: block; }
  .main-nav {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition);
  }
  .main-nav.is-open { max-height: 320px; }
  .main-nav .nav-list { flex-direction: column; align-items: stretch; gap: 0; padding: 8px 0; }
  .main-nav .nav-list li { border-bottom: 1px solid var(--blue-050); }
  .main-nav .nav-link { border-radius: 0; padding: 14px 24px; }
  .header-inner { height: var(--nav-h); }
}

@media (max-width: 768px) {
  .section { padding: 60px 0; }
  h1 { font-size: 30px; }
  h2 { font-size: 25px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .about-summary { grid-template-columns: 1fr; gap: 32px; }
  .hero { min-height: 520px; }
  .hero-content { padding: 72px 0; }
  .hero h1 { font-size: 32px; }
  .hero-sub { font-size: 16px; }
  .page-hero { padding: 64px 0 48px; }
  .cta-bar { padding: 32px 24px; }
  .contact-form { padding: 24px; }
  .form-row { grid-template-columns: 1fr; }
  .culture-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .timeline { padding-left: 22px; }
  .timeline-item::before { left: -31px; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .stat-num { font-size: 30px; }
  /* 长文案按钮（如招聘邮箱）允许换行，避免窄屏横向溢出 */
  .btn { white-space: normal; text-align: center; }
  .brand-text small { display: none; }
  .lang-btn { padding: 5px 10px; font-size: 12px; }
}

/* 打印/降级：禁用 JS 时保证内容可见 */
.no-js .reveal { opacity: 1; transform: none; }

/* ------------------------------ 12. 补充细节 ------------------------------ */
/* 锚点跳转时避开吸顶导航 */
[id] { scroll-margin-top: 92px; }

/* 方案卡片中的"客户价值"标签 */
.solution-value strong {
  display: block;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--blue-700);
  text-transform: uppercase;
  margin-bottom: 4px;
}

/* 联系信息图标与文字基线对齐 */
.contact-info .card { align-items: flex-start; }