/* ==========================================================================
   base.css —— 全站公共样式（所有页面都会加载这一个文件）
   修改颜色 / 按钮 / 顶部导航 / 底部 都在这里，改一次全站生效。
   各栏目的专属样式放在 assets/css/栏目名.css 里，互不影响。
   ========================================================================== */

/* ---------- 1. 主题变量：想换整站配色，只改这里 ---------- */
:root {
  --primary: #1a5cb5;
  --primary-dark: #15499e;
  --primary-light: #e8f0fe;
  --accent: #00a870;
  --accent-light: #e6f7f0;

  --text: #1a1a2e;
  --text-light: #6b7280;
  --text-lighter: #9ca3af;
  --border: #e5e7eb;
  --bg-gray: #f5f7fa;
  --white: #ffffff;

  --container: 1200px;
  --radius: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 2px 10px rgba(16, 35, 70, 0.06);
  --shadow: 0 10px 30px rgba(16, 35, 70, 0.08);
  --shadow-lg: 0 20px 50px rgba(16, 35, 70, 0.14);
  --transition: all 0.3s ease;
}

/* ---------- 2. 基础重置 ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--white);
  overflow-x: hidden;
}

img { max-width: 100%; display: block; border: 0; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button, input, textarea, select { font-family: inherit; font-size: inherit; outline: none; }
button { cursor: pointer; border: none; background: none; }

/* ---------- 3. 通用布局 ---------- */
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 20px; }

.section { padding: 80px 0; }
.section--gray { background: var(--bg-gray); }
.section--tight { padding: 56px 0; }

.section-head { text-align: center; margin-bottom: 48px; }
.section-head h2 { font-size: 34px; font-weight: 700; letter-spacing: -0.5px; }
.section-head p { margin-top: 10px; color: var(--text-light); font-size: 16px; }
.section-head::after {
  content: ""; display: block; width: 56px; height: 3px; border-radius: 2px;
  background: var(--primary); margin: 18px auto 0;
}
.section-head--left { text-align: left; }
.section-head--left::after { margin-left: 0; }

.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); }

/* ---------- 4. 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 30px; border-radius: 6px; font-size: 15px; font-weight: 500;
  transition: var(--transition); white-space: nowrap;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 10px 22px rgba(26, 92, 181, 0.28); }
.btn-outline { border: 2px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }
.btn-white { background: #fff; color: var(--primary); }
.btn-white:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.btn-ghost-light { border: 1px solid rgba(255, 255, 255, 0.55); color: #fff; }
.btn-ghost-light:hover { background: rgba(255, 255, 255, 0.16); }
.btn-sm { padding: 9px 20px; font-size: 14px; }

/* ---------- 5. 卡片 ---------- */
.card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg);
  overflow: hidden; transition: var(--transition); height: 100%;
  display: flex; flex-direction: column;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.card__media { position: relative; overflow: hidden; background: var(--primary-light); }
.card__media img { width: 100%; height: 200px; object-fit: cover; transition: transform 0.5s ease; }
.card:hover .card__media img { transform: scale(1.06); }
.card__body { padding: 22px; flex: 1; display: flex; flex-direction: column; }
.card__body h3 { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
.card__body p { color: var(--text-light); font-size: 14px; flex: 1; }
.card__more { margin-top: 14px; color: var(--primary); font-size: 14px; font-weight: 500; display: inline-flex; align-items: center; gap: 6px; }
.card__more::after { content: "→"; transition: var(--transition); }
.card:hover .card__more::after { transform: translateX(4px); }

/* ---------- 6. 顶部导航（由 assets/js/layout.js 生成） ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 900;
  background: rgba(255, 255, 255, 0.96); backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent; transition: var(--transition);
}
.site-header .header-inner {
  display: flex; align-items: center; justify-content: space-between; height: 78px;
  transition: var(--transition);
}
.site-header.is-scrolled { box-shadow: 0 6px 24px rgba(16, 35, 70, 0.08); border-bottom-color: var(--border); }
.site-header.is-scrolled .header-inner { height: 66px; }

/* 首页顶部是深色大图，导航初始为透明白字 */
body[data-hero="true"] .site-header:not(.is-scrolled) { background: transparent; border-bottom-color: transparent; }
body[data-hero="true"] .site-header:not(.is-scrolled) .brand-name,
body[data-hero="true"] .site-header:not(.is-scrolled) .brand-sub,
body[data-hero="true"] .site-header:not(.is-scrolled) .nav-link { color: #fff; }
body[data-hero="true"] .site-header:not(.is-scrolled) .nav-link:hover { color: #fff; background: rgba(255, 255, 255, 0.14); }
body[data-hero="true"] .site-header:not(.is-scrolled) .header-wa,
body[data-hero="true"] .site-header:not(.is-scrolled) .menu-toggle { color: #fff; border-color: rgba(255, 255, 255, 0.4); }

.brand { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.brand-img { height: 40px; width: auto; display: block; transition: var(--transition); }
.brand-img--light { display: none; }
body[data-hero="true"] .site-header:not(.is-scrolled) .brand-img--dark { display: none; }
body[data-hero="true"] .site-header:not(.is-scrolled) .brand-img--light { display: block; }
.site-header.is-scrolled .brand-img { height: 34px; }
.brand-logo { width: 42px; height: 42px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.brand-logo img { width: 100%; height: 100%; object-fit: contain; display: block; }
.brand-name { font-size: 19px; font-weight: 700; line-height: 1.2; color: var(--text); transition: var(--transition); }
.brand-sub { font-size: 12px; color: var(--text-lighter); letter-spacing: 0.5px; transition: var(--transition); }

.main-nav { display: flex; align-items: center; gap: 2px; }
.nav-item { position: relative; }
.nav-link {
  display: flex; align-items: center; gap: 4px; padding: 10px 15px; border-radius: 6px;
  font-size: 15px; color: var(--text); transition: var(--transition); white-space: nowrap;
}
.nav-link:hover { color: var(--primary); background: var(--primary-light); }
.nav-link.is-active { color: var(--primary); font-weight: 600; }
.nav-link .caret { font-size: 10px; opacity: 0.6; }

.dropdown {
  position: absolute; top: 100%; left: 0; min-width: 240px; padding: 8px;
  background: #fff; border: 1px solid var(--border); border-radius: 12px;
  box-shadow: var(--shadow-lg); opacity: 0; visibility: hidden; transform: translateY(8px);
  transition: var(--transition);
}
.nav-item:hover .dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown--wide { min-width: 520px; display: grid; grid-template-columns: 1fr 1fr; }
.dropdown a {
  display: block; padding: 9px 14px; border-radius: 8px; font-size: 14px; color: var(--text-light);
  transition: var(--transition);
}
.dropdown a:hover { background: var(--primary-light); color: var(--primary); }

/* 产品中心：三栏超级菜单 */
.dropdown--mega {
  left: 50%; transform: translate(-50%, 8px); width: min(980px, 94vw);
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; padding: 20px;
}
.nav-item--mega:hover .dropdown--mega { transform: translate(-50%, 0); }
.mega-col { padding: 0 10px; }
.mega-col + .mega-col { border-left: 1px solid var(--border); }
.mega-col__title {
  display: block; font-size: 15px; font-weight: 700; color: var(--text);
  padding: 6px 12px 12px; border-radius: 8px;
}
.mega-col__title:hover { color: var(--primary); background: transparent; }
.mega-col__list { max-height: 52vh; overflow-y: auto; }
.mega-col__list a { padding: 7px 12px; font-size: 13.5px; }

.header-right { display: flex; align-items: center; gap: 12px; }
.header-wa {
  display: inline-flex; align-items: center; gap: 7px; padding: 7px 14px; border-radius: 999px;
  border: 1px solid var(--border); font-size: 13px; color: var(--text-light); transition: var(--transition);
}
.header-wa:hover { border-color: #25D366; color: #128C7E; }
.header-wa svg { flex-shrink: 0; }
.header-cta { padding: 9px 18px; font-size: 14px; }
.lang-btn {
  display: inline-flex; align-items: center; gap: 6px; padding: 7px 14px; border-radius: 999px;
  border: 1px solid var(--border); font-size: 13px; color: var(--text-light); transition: var(--transition);
}
.lang-btn:hover { border-color: var(--primary); color: var(--primary); }
.menu-toggle {
  display: none; width: 42px; height: 42px; border-radius: 8px; border: 1px solid var(--border);
  align-items: center; justify-content: center; color: var(--text);
}

/* 移动端展开菜单 */
.mobile-nav { display: none; background: #fff; border-top: 1px solid var(--border); max-height: 78vh; overflow-y: auto; }
.mobile-nav.is-open { display: block; }
.mobile-nav .container { padding-top: 12px; padding-bottom: 20px; }
.mobile-group-title {
  font-size: 14px; font-weight: 700; color: var(--primary); padding: 12px 12px 6px;
}
.mobile-nav a { display: block; padding: 10px 12px; border-radius: 8px; font-size: 15px; color: var(--text-light); }
.mobile-nav a:hover { background: var(--primary-light); color: var(--primary); }
.mobile-nav .mobile-toplevel { font-size: 16px; color: var(--text); font-weight: 600; margin-top: 6px; }
.mobile-nav .mobile-sub { font-size: 14px; font-weight: 700; color: var(--primary); padding-left: 20px; margin-top: 6px; }
.mobile-nav .mobile-deep { font-size: 14px; padding-left: 32px; }

/* ---------- 7. 内页顶部 Banner ---------- */
.page-banner {
  padding: 150px 0 64px; color: #fff; position: relative; overflow: hidden;
  background: linear-gradient(135deg, #1a5cb5 0%, #0b236e 100%);
}
.page-banner::before,
.page-banner::after { content: ""; position: absolute; border-radius: 50%; background: rgba(255, 255, 255, 0.07); }
.page-banner::before { width: 420px; height: 420px; top: -160px; left: -80px; }
.page-banner::after { width: 300px; height: 300px; bottom: -140px; right: 6%; }
.page-banner .container { position: relative; z-index: 2; }
.page-banner h1 { font-size: 40px; font-weight: 700; letter-spacing: -0.5px; }
.page-banner p { margin-top: 12px; max-width: 760px; color: rgba(255, 255, 255, 0.82); font-size: 17px; }
.page-banner .divider { width: 60px; height: 3px; border-radius: 2px; background: rgba(255, 255, 255, 0.5); margin-top: 22px; }

/* 面包屑 */
.breadcrumb { display: flex; flex-wrap: wrap; gap: 8px; font-size: 14px; color: rgba(255, 255, 255, 0.72); margin-bottom: 14px; }
.breadcrumb a:hover { color: #fff; }
.breadcrumb span.sep { opacity: 0.5; }

/* ---------- 8. 底部（由 assets/js/layout.js 生成） ---------- */
.site-footer { background: #101a2e; color: #fff; padding: 64px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 40px; }
.footer-col h4 { font-size: 15px; letter-spacing: 1px; margin-bottom: 18px; color: #fff; }
.footer-col p, .footer-col li { color: #9aa6bd; font-size: 14px; }
.footer-col li + li { margin-top: 10px; }
.footer-col a:hover { color: #fff; }
.footer-col--brand { max-width: 340px; }
.footer-logo { height: 108px; width: auto; margin-bottom: 18px; }
.footer-about { margin-bottom: 12px; }
.footer-legal { font-size: 13px !important; line-height: 1.8; color: #6f7c95 !important; }
.footer-group { margin-top: 16px; font-size: 13px; font-weight: 700; color: #cbd4e6; }
.footer-group:first-child { margin-top: 0; }
.footer-contact li { display: flex; gap: 6px; }
.footer-contact li > span:first-child { white-space: nowrap; }
.footer-qr { display: flex; gap: 12px; margin-top: 16px; }
.footer-qr figure { margin: 0; background: #fff; border-radius: 8px; padding: 7px; text-align: center; }
.footer-qr img { width: 84px; height: 84px; object-fit: contain; display: block; }
.footer-qr figcaption { font-size: 11px; color: var(--text-light); margin-top: 4px; }
.footer-bottom {
  margin-top: 48px; padding: 22px 0; border-top: 1px solid #1e2a44;
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  font-size: 13px; color: #7c89a3;
}
.footer-bottom .footer-links { display: flex; gap: 20px; }
.to-top { color: #9aa6bd; font-size: 13px; }
.to-top:hover { color: #fff; }

/* ---------- 9. 通用小组件 ---------- */
.tag {
  display: inline-block; padding: 4px 12px; border-radius: 999px; font-size: 12px;
  background: var(--primary-light); color: var(--primary);
}
.chip-row { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  padding: 9px 20px; border-radius: 999px; background: var(--bg-gray); color: var(--text-light);
  font-size: 14px; transition: var(--transition);
}
.chip:hover { background: #e9edf4; }
.chip.is-active { background: var(--primary); color: #fff; }

.quote-box {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 40px; box-shadow: var(--shadow-sm);
}
.check-list li { display: flex; gap: 10px; align-items: flex-start; color: var(--text); font-size: 15px; }
.check-list li + li { margin-top: 12px; }
.check-list li::before { content: "✓"; color: var(--accent); font-weight: 700; flex-shrink: 0; }

.cta-band {
  background: linear-gradient(135deg, #1a5cb5 0%, #0b236e 100%);
  color: #fff; padding: 64px 0; text-align: center;
}
.cta-band h2 { font-size: 30px; font-weight: 700; }
.cta-band p { color: rgba(255, 255, 255, 0.75); margin: 12px auto 26px; max-width: 640px; }

.not-found-tip {
  background: #fffbea; border: 1px solid #f5e2a8; color: #8a6d1f;
  padding: 12px 16px; border-radius: 8px; font-size: 14px;
}

/* 通用说明性卡片与提示行 */
.why-card { padding: 28px 26px; }
.why-card h3 { font-size: 17px; margin-bottom: 10px; }
.why-card p { color: var(--text-light); font-size: 14.5px; line-height: 1.85; }
.notice-line {
  margin-top: 26px; padding: 14px 18px; border-radius: 8px; font-size: 14px;
  background: var(--primary-light); color: var(--primary-dark);
}

/* 图片占位说明（正式图片放好后可删掉这个提示条） */
.img-note { font-size: 12px; color: var(--text-lighter); margin-top: 8px; }

/* ---------- 9.1 左侧栏目导航（产品 / 技术平台等栏目通用） ---------- */
.with-side { display: grid; grid-template-columns: 260px 1fr; gap: 40px; align-items: start; }
.side-nav {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg);
  overflow: hidden; position: sticky; top: 100px;
}
.side-nav h3 { padding: 18px 22px; font-size: 17px; background: var(--primary); color: #fff; }
.side-nav a {
  display: block; padding: 14px 22px; border-bottom: 1px solid var(--border);
  font-size: 15px; color: var(--text-light); transition: var(--transition);
}
.side-nav a:last-child { border-bottom: 0; }
.side-nav a:hover { background: var(--primary-light); color: var(--primary); }
.side-nav a.is-active { background: var(--primary-light); color: var(--primary); font-weight: 600; box-shadow: inset 3px 0 0 var(--primary); }
.side-contact { padding: 20px 22px; background: var(--bg-gray); font-size: 13px; color: var(--text-light); }
.side-contact strong { display: block; color: var(--primary); font-size: 18px; margin: 4px 0 8px; }

/* ---------- 9.2 正文排版 ---------- */
.prose { font-size: 16px; color: #374151; line-height: 1.95; }
.prose p + p { margin-top: 16px; }
.prose h3 { font-size: 20px; margin: 30px 0 10px; color: var(--text); }
.prose ul { margin: 12px 0 0 4px; }
.prose li { position: relative; padding-left: 18px; color: var(--text-light); }
.prose li + li { margin-top: 8px; }
.prose li::before { content: ""; position: absolute; left: 0; top: 12px; width: 6px; height: 6px; border-radius: 50%; background: var(--primary); }

/* ---------- 9.3 参数表 ---------- */
.spec-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.spec-table th, .spec-table td { border: 1px solid var(--border); padding: 12px 16px; text-align: left; }
.spec-table th { background: var(--bg-gray); width: 32%; font-weight: 600; }

/* ---------- 9.4 小尺寸内页 Banner ---------- */
.page-banner--sm { padding: 132px 0 46px; }
.page-banner--sm h1 { font-size: 32px; }

@media (max-width: 1080px) {
  .with-side { grid-template-columns: 1fr; }
  .side-nav { position: static; }
}

/* ---------- 10. 滚动入场动画 ----------
   只有浏览器成功执行了脚本（html 上有 .js 类）才会隐藏元素；
   万一脚本加载失败，页面内容照常显示，不会出现空白。 */
.js .reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s ease, transform 0.7s ease; }
.js .reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 11. 响应式 ---------- */
@media (max-width: 1080px) {
  .main-nav { display: none; }
  .menu-toggle { display: inline-flex; }
  .section-head h2 { font-size: 28px; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
  .section { padding: 56px 0; }
  .page-banner { padding: 130px 0 48px; }
  .page-banner h1 { font-size: 28px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .quote-box { padding: 26px; }
}