/* ============================================================
   中网互联 zwhl.com 新版官网 - 共享样式
   清爽科技风 · 白底 + 浅蓝分区 + 蓝色主色调
   ============================================================ */
:root {
  /* 底色体系：白 → 极浅蓝 → 浅蓝，形成清爽的分层 */
  --bg-white: #ffffff;
  --bg-soft: #f3f8ff;        /* 极浅蓝，用于交替板块 */
  --bg-tint: #e8f1fe;        /* 浅蓝，用于强调板块 */
  --bg-card: #ffffff;

  /* 蓝色主色 */
  --primary: #1b6ef3;
  --primary-deep: #1257c9;
  --primary-light: #4a90ff;
  --accent: #06a7d4;         /* 青蓝点缀 */

  /* 文字：深蓝灰，保证白底可读 */
  --text: #16233a;
  --text-mid: #3d4f6b;
  --text-dim: #64748b;
  --border: #dbe7f6;
  --border-strong: #c3d8f0;

  --radius: 14px;
  --shadow-sm: 0 2px 10px rgba(27, 110, 243, .06);
  --shadow-md: 0 8px 28px rgba(27, 110, 243, .10);
  --shadow-lg: 0 16px 44px rgba(27, 110, 243, .14);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg-white);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; transition: color .2s; }
a:hover { color: var(--primary-deep); }

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

.container { width: min(1200px, 92%); margin: 0 auto; }

/* ---------- 顶部通栏 ---------- */
.topbar {
  background: var(--bg-soft);
  border-bottom: 1px solid var(--border);
  font-size: 13px; color: var(--text-dim);
}
.topbar .container { display: flex; justify-content: space-between; align-items: center; min-height: 36px; flex-wrap: wrap; gap: 6px; }
.topbar strong { color: var(--primary); font-weight: 700; }
.topbar a { color: var(--text-dim); }
.topbar a:hover { color: var(--primary); }

/* ---------- 导航 ---------- */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.94);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 0 rgba(27,110,243,.03);
}
.nav { display: flex; align-items: center; min-height: 68px; gap: 8px; }
.brand { display: flex; align-items: center; gap: 10px; margin-right: auto; }
.brand-logo {
  width: 40px; height: 40px; border-radius: 11px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 18px; color: #fff;
  box-shadow: 0 4px 14px rgba(27,110,243,.28);
}
.brand-name { font-size: 20px; font-weight: 700; letter-spacing: .5px; color: var(--text); }
.brand-name span { color: var(--primary); }
.nav-links { display: flex; gap: 2px; flex-wrap: wrap; }
.nav-links a {
  padding: 8px 12px; border-radius: 8px; color: var(--text-mid);
  font-size: 15px; white-space: nowrap; font-weight: 500;
}
.nav-links a:hover { color: var(--primary); background: var(--bg-soft); }
.nav-links a.active { color: var(--primary); background: var(--bg-tint); font-weight: 700; }

/* ---------- 面包屑 ---------- */
.crumbs { padding: 18px 0 0; font-size: 13px; color: var(--text-dim); }
.crumbs a { color: var(--text-dim); }
.crumbs a:hover { color: var(--primary); }

/* ---------- 页头横幅（浅蓝渐层，取代深色大图遮罩） ---------- */
.page-hero {
  position: relative; margin-top: 18px; border-radius: var(--radius);
  overflow: hidden; min-height: 230px;
  display: flex; align-items: center;
  border: 1px solid var(--border-strong);
  background: linear-gradient(115deg, #eaf3ff 0%, #dbeaff 45%, #cfe4ff 100%);
}
.page-hero img.bg {
  position: absolute; right: 0; top: 0; width: 46%; height: 100%;
  object-fit: cover; opacity: .9;
  -webkit-mask-image: linear-gradient(90deg, transparent 0%, #000 45%);
  mask-image: linear-gradient(90deg, transparent 0%, #000 45%);
}
.page-hero .overlay {
  position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(234,243,255,.96) 30%, rgba(234,243,255,.55) 60%, rgba(219,234,255,.15) 100%);
}
.page-hero .inner { position: relative; z-index: 2; padding: 48px 52px; max-width: 62%; }
.page-hero h1 { font-size: 34px; letter-spacing: 1px; margin-bottom: 10px; color: var(--text); }
.page-hero p { color: var(--text-mid); max-width: 620px; font-size: 15.5px; }

/* 首页大横幅：保留深蓝科技感主视觉，仅此一处深色 */
.hero-dark {
  position: relative; margin-top: 0; overflow: hidden;
  background: linear-gradient(120deg, #0f2a5c 0%, #12407f 55%, #0d5a92 100%);
  min-height: 520px; display: flex; align-items: center;
}
.hero-dark img.bg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: .34; }
.hero-dark .overlay { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(10,30,66,.92) 15%, rgba(12,45,90,.55) 55%, rgba(13,60,110,.3)); }
.hero-dark .inner { position: relative; z-index: 2; padding: 64px 0; }
.hero-dark h1 { font-size: 46px; letter-spacing: 3px; margin-bottom: 14px; color: #fff; }
.hero-dark p { color: rgba(226,238,255,.9); font-size: 17px; max-width: 640px; }
.hero-dark .tag { color: #bfe0ff; border-color: rgba(191,224,255,.45); background: rgba(255,255,255,.08); }
.hero-dark .btn { box-shadow: 0 6px 22px rgba(0,0,0,.3); }
.hero-dark .btn-ghost {
  background: rgba(255,255,255,.10) !important;
  border: 1px solid rgba(255,255,255,.75) !important;
  color: #fff !important; box-shadow: none;
}
.hero-dark .btn-ghost:hover { background: rgba(255,255,255,.22) !important; }

/* 首页浅色横幅下的过渡带 */
.hero-sub {
  background: var(--bg-soft); border-bottom: 1px solid var(--border);
  padding: 34px 0;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block; padding: 11px 30px; border-radius: 10px;
  font-size: 15px; font-weight: 600; cursor: pointer; border: none;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff; transition: transform .15s, box-shadow .15s, background .15s;
  box-shadow: 0 6px 18px rgba(27,110,243,.24);
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(27,110,243,.32); color:#fff; }
.btn-ghost {
  background: #fff; border: 1px solid var(--border-strong); color: var(--primary);
  box-shadow: none; margin-left: 12px;
}
.btn-ghost:hover { background: var(--bg-soft); border-color: var(--primary); color: var(--primary-deep); }

/* ---------- 区块与分区底色 ---------- */
.section { padding: 64px 0; }
.section-soft { background: var(--bg-soft); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-tint { background: linear-gradient(180deg, #eef5ff 0%, #e4f0ff 100%); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-head { text-align: center; margin-bottom: 44px; }
.section-head h2 { font-size: 30px; letter-spacing: .5px; color: var(--text); }
.section-head h2::after {
  content: ""; display: block; width: 56px; height: 3px; margin: 14px auto 0;
  background: linear-gradient(90deg, var(--primary), var(--accent)); border-radius: 2px;
}
.section-head p { color: var(--text-dim); margin-top: 12px; }
.section-head.left { text-align: left; }
.section-head.left h2::after { margin-left: 0; }

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: transform .2s, border-color .2s, box-shadow .2s;
}
.card:hover {
  transform: translateY(-4px); border-color: var(--primary-light);
  box-shadow: var(--shadow-lg);
}
.card h3 { font-size: 19px; margin-bottom: 10px; color: var(--text); }
.card h3 a { color: var(--text); }
.card h3 a:hover { color: var(--primary); }
.card p { color: var(--text-dim); font-size: 14.5px; }
.card .more { display: inline-block; margin-top: 14px; font-size: 14px; font-weight: 600; color: var(--primary); }
.card .icon {
  width: 52px; height: 52px; border-radius: 13px; margin-bottom: 18px;
  background: linear-gradient(135deg, #e2eeff, #d3e5ff);
  display: flex; align-items: center; justify-content: center; font-size: 25px;
}
.card-img { border-radius: 10px; overflow: hidden; margin-bottom: 18px; position: relative; }
.card-img img { width: 100%; height: 190px; object-fit: cover; transition: transform .3s; }
.card:hover .card-img img { transform: scale(1.05); }

/* 浅色板块中的卡片略加强化边框 */
.section-tint .card, .section-soft .card { border-color: var(--border-strong); }

/* ---------- 图文两栏 ---------- */
.split { display: grid; grid-template-columns: 1.05fr 1fr; gap: 44px; align-items: center; }
.split img { border-radius: var(--radius); border: 1px solid var(--border-strong); box-shadow: var(--shadow-md); }
.split h2 { font-size: 26px; margin-bottom: 16px; color: var(--text); }
.split p { color: var(--text-mid); margin-bottom: 12px; }

/* ---------- 价格表 ---------- */
.price-card { text-align: center; position: relative; background: #fff; }
.price-card .price { font-size: 30px; color: var(--primary); font-weight: 800; margin: 8px 0; }
.price-card .price small { font-size: 14px; color: var(--text-dim); font-weight: 400; }
.price-card ul { list-style: none; margin: 16px 0 22px; color: var(--text-dim); font-size: 14px; }
.price-card ul li { padding: 6px 0; border-bottom: 1px dashed var(--border); }
.price-card.hot { border: 2px solid var(--primary); box-shadow: var(--shadow-lg); }
.price-card.hot::before {
  content: "热销"; position: absolute; top: -13px; left: 50%; transform: translateX(-50%);
  background: linear-gradient(90deg, var(--primary), var(--accent));
  padding: 2px 18px; border-radius: 20px; font-size: 12px; color: #fff;
}
.tag {
  display: inline-block; font-size: 12px; color: var(--primary-deep);
  background: #e6f0ff; border: 1px solid #cfe2ff;
  padding: 2px 12px; border-radius: 20px; margin: 0 4px 6px 0;
}

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--border-strong); border-radius: var(--radius); background: #fff; box-shadow: var(--shadow-sm); }
table.tb { width: 100%; border-collapse: collapse; font-size: 14.5px; min-width: 640px; }
table.tb th { background: var(--bg-tint); padding: 14px 16px; text-align: left; white-space: nowrap; color: var(--text); font-weight: 700; }
table.tb td { padding: 12px 16px; border-top: 1px solid var(--border); color: var(--text-mid); }
table.tb td:first-child { color: var(--text); font-weight: 600; }
table.tb tbody tr:nth-child(even) td { background: #fafcff; }
table.tb tr:hover td { background: #eff6ff; }
.price-now { color: var(--primary); font-weight: 800; }

/* ---------- 新闻/文章列表 ---------- */
.list-item {
  display: flex; gap: 22px; padding: 22px; border-radius: var(--radius);
  background: #fff; border: 1px solid var(--border); margin-bottom: 16px;
  box-shadow: var(--shadow-sm); transition: border-color .2s, box-shadow .2s;
}
.list-item:hover { border-color: var(--primary-light); box-shadow: var(--shadow-md); }
.list-item .date {
  flex: 0 0 auto; text-align: center; padding: 8px 14px; border-radius: 10px;
  background: var(--bg-tint); color: var(--primary); font-size: 13px; line-height: 1.5;
  align-self: flex-start; font-weight: 600;
}
.list-item .date b { display: block; font-size: 22px; }
.list-item h3 { font-size: 17px; margin-bottom: 6px; }
.list-item h3 a { color: var(--text); }
.list-item h3 a:hover { color: var(--primary); }
.list-item p { color: var(--text-dim); font-size: 14px; }

/* ---------- 文章详情 ---------- */
.article { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 44px; box-shadow: var(--shadow-sm); }
.article h1 { font-size: 27px; margin-bottom: 12px; line-height: 1.45; color: var(--text); }
.article .meta { color: var(--text-dim); font-size: 13px; margin-bottom: 28px; padding-bottom: 20px; border-bottom: 1px solid var(--border); }
.article h2 { font-size: 21px; margin: 30px 0 12px; padding-left: 12px; border-left: 3px solid var(--primary); color: var(--text); }
.article h3 { font-size: 17px; margin: 22px 0 10px; color: var(--primary); }
.article p { color: var(--text-mid); margin-bottom: 12px; }
.article ul, .article ol { color: var(--text-mid); margin: 0 0 14px 22px; }
.article li { margin-bottom: 6px; }
.article img { border-radius: 10px; margin: 18px 0; }
.article strong, .article b { color: var(--text); }
.article .img-note { font-size: 12px; color: var(--text-dim); background: var(--bg-soft); border-left: 3px solid var(--primary); padding: 6px 12px; border-radius: 0 8px 8px 0; display: inline-block; margin-top: 6px; }
.related, .rel-list { list-style: none; margin: 0; }
.rel-list li { padding: 9px 0; border-bottom: 1px dashed var(--border); }
.rel-list li:last-child { border-bottom: none; }
.art-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 30px; }
.art-nav-item {
  display: block; padding: 14px 18px; border-radius: 10px; background: var(--bg-soft);
  border: 1px solid var(--border); font-size: 14px;
}
.art-nav-item span { display: block; color: var(--text-dim); font-size: 12px; margin-bottom: 2px; }
.art-nav-item b { color: var(--text); font-weight: 600; }
.art-nav-item:hover { border-color: var(--primary-light); background: #eef6ff; }

/* ---------- FAQ 折叠 ---------- */
.faq-item { background: #fff; border: 1px solid var(--border); border-radius: 12px; margin-bottom: 14px; overflow: hidden; box-shadow: var(--shadow-sm); }
.faq-item summary { cursor: pointer; padding: 18px 22px; font-weight: 600; list-style: none; position: relative; padding-right: 46px; color: var(--text); }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; position: absolute; right: 20px; top: 50%; transform: translateY(-50%); font-size: 22px; color: var(--primary); transition: transform .2s; }
.faq-item[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq-item[open] { border-color: var(--primary-light); }
.faq-item .faq-body { padding: 0 22px 20px; color: var(--text-mid); font-size: 14.5px; }

/* ---------- 联系卡 ---------- */
.contact-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.contact-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px; text-align: center; box-shadow: var(--shadow-sm);
  transition: transform .2s, box-shadow .2s, border-color .2s;
}
.contact-card:hover { transform: translateY(-3px); border-color: var(--primary-light); box-shadow: var(--shadow-md); }
.contact-card .icon { font-size: 28px; margin-bottom: 8px; }
.contact-card b { display: block; font-size: 18px; color: var(--primary); margin: 4px 0; word-break: break-all; }
.contact-card b a { color: inherit; }
.contact-card span { color: var(--text-dim); font-size: 13px; }

/* ---------- CTA 条 ---------- */
.cta-band {
  border-radius: var(--radius); padding: 42px 48px; margin: 40px 0;
  background: linear-gradient(120deg, #e8f2ff 0%, #d9e9ff 55%, #cfe3ff 100%);
  border: 1px solid var(--border-strong);
  display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap;
}
.cta-band h2 { font-size: 24px; margin-bottom: 6px; color: var(--text); }
.cta-band p { color: var(--text-mid); }

/* ---------- 统计 ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center; }
.stats > div {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px 12px; box-shadow: var(--shadow-sm);
}
.stats b { font-size: 34px; color: var(--primary); font-weight: 800; }
.stats span { display: block; color: var(--text-dim); font-size: 14px; margin-top: 4px; }

/* ---------- 徽标条 ---------- */
.logo-strip { display: flex; gap: 14px; flex-wrap: wrap; justify-content: center; }
.logo-strip .lg {
  background: #fff; border: 1px solid var(--border-strong); border-radius: 10px;
  padding: 11px 24px; color: var(--text-mid); font-size: 14px; font-weight: 600;
}

/* ---------- 页脚（深蓝压底，与白底形成收束） ---------- */
.footer {
  margin-top: 70px;
  background: linear-gradient(180deg, #0f2a5c 0%, #0b2149 100%);
  color: #c9d9f0;
}
.footer-main { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 36px; padding: 52px 0 36px; }
.footer h4 { font-size: 16px; margin-bottom: 16px; color: #fff; }
.footer-col a { display: block; color: #a9c0dd; font-size: 14px; padding: 4px 0; }
.footer-col a:hover { color: #7fc4ff; }
.footer p { color: #a9c0dd; font-size: 14px; }
.footer a { color: #a9c0dd; }
.footer a:hover { color: #7fc4ff; }
.footer .btn { color: #fff; }
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.footer-brand b { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(160,195,235,.18); padding: 20px 0;
  font-size: 13px; color: #8fa8c8; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px;
}
.footer .qr-tip { font-size: 12.5px; color: #8fa8c8; margin-top: 8px; }

/* ---------- 移动端菜单按钮 ---------- */
.nav-toggle {
  display: none; background: var(--bg-soft); color: var(--primary);
  border: 1px solid var(--border-strong); border-radius: 8px;
  font-size: 20px; line-height: 1; padding: 8px 12px; cursor: pointer;
}

/* ---------- 移动端底部快捷条 ---------- */
.mobile-bar { display: none; }

/* ---------- 表单 ---------- */
input, textarea, select { font-family: inherit; }
input:focus, textarea:focus { outline: 2px solid rgba(27,110,243,.28); outline-offset: 1px; border-color: var(--primary) !important; }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .grid-3, .grid-4, .contact-grid { grid-template-columns: repeat(2, 1fr); }
  .split { grid-template-columns: 1fr; }
  .footer-main { grid-template-columns: repeat(2, 1fr); }
  .nav { height: auto; padding: 12px 0; flex-wrap: wrap; position: relative; }
  .nav-toggle { display: block; margin-left: auto; }
  .nav-links {
    display: none; flex-basis: 100%; flex-direction: column; gap: 0;
    padding-top: 10px; border-top: 1px solid var(--border); margin-top: 10px;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 11px 12px; border-bottom: 1px solid var(--border); border-radius: 0; }
  .page-hero .inner { padding: 32px 24px; max-width: 100%; }
  .page-hero h1 { font-size: 26px; }
  .page-hero img.bg { width: 100%; opacity: .25; }
  .page-hero .overlay { background: rgba(234,243,255,.82); }
  .hero-dark { min-height: 420px; }
  .hero-dark h1 { font-size: 32px; }
  .article { padding: 26px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .cta-band { padding: 30px 26px; }
}
@media (max-width: 700px) {
  .mobile-bar {
    display: grid; grid-template-columns: repeat(4, 1fr);
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 200;
    background: rgba(255,255,255,.97); border-top: 1px solid var(--border);
    box-shadow: 0 -4px 18px rgba(27,110,243,.10);
    backdrop-filter: blur(10px);
  }
  .mobile-bar a {
    display: flex; flex-direction: column; align-items: center; gap: 2px;
    padding: 8px 0 10px; font-size: 12px; color: var(--text-dim);
  }
  .mobile-bar a span { font-size: 17px; }
  .mobile-bar a:first-child { color: var(--primary); font-weight: 700; }
  body { padding-bottom: 62px; }
}
@media (max-width: 600px) {
  .grid-2, .grid-3, .grid-4, .contact-grid { grid-template-columns: 1fr; }
  .footer-main { grid-template-columns: 1fr; }
  .list-item { flex-direction: column; }
  .art-nav { grid-template-columns: 1fr; }
}