/* ============================================================
   阿里企业邮箱展示网站 全局样式
   响应式: 桌面 / 平板 / 手机 自适应
   ============================================================ */
:root {
  --primary: #FF6A00;
  --primary-dark: #FF4E00;
  --blue: #1366EC;
  --ink: #1a1a1a;
  --gray: #666;
  --gray-light: #999;
  --bg: #fff;
  --bg-alt: #f7f8fa;
  --border: #e8eaed;
  --radius: 12px;
  --shadow: 0 6px 24px rgba(17, 30, 60, .07);
  --shadow-lg: 0 12px 40px rgba(17, 30, 60, .12);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  font-size: 15px;
  line-height: 1.7;
  background: var(--bg);
}
img { max-width: 100%; height: auto; border: 0; vertical-align: middle; }
a { color: inherit; text-decoration: none; transition: color .2s; }
ul, ol { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block;
  padding: 10px 22px;
  border-radius: 6px;
  border: 1px solid transparent;
  font-size: 15px;
  line-height: 1.5;
  text-align: center;
  cursor: pointer;
  transition: all .2s;
  font-family: inherit;
}
.btn-primary { background: linear-gradient(135deg, #FF6A00, #FF4E00); color: #fff; box-shadow: 0 4px 14px rgba(255, 106, 0, .35); }
.btn-primary:hover { background: linear-gradient(135deg, #FF5A00, #F04000); box-shadow: 0 6px 18px rgba(255, 106, 0, .45); }
.btn-outline { border-color: var(--primary); color: var(--primary); background: #fff; }
.btn-outline:hover { background: rgba(255, 106, 0, .06); }
.btn-light { background: #fff; color: var(--primary-dark); box-shadow: 0 4px 14px rgba(0, 0, 0, .12); }
.btn-light:hover { background: #fff5ee; }
.btn-outline-light { border-color: rgba(255, 255, 255, .8); color: #fff; }
.btn-outline-light:hover { background: rgba(255, 255, 255, .14); }
.btn-lg { padding: 13px 34px; font-size: 16px; border-radius: 8px; }
.btn-sm { padding: 7px 16px; font-size: 13px; }
.btn-block { display: block; width: 100%; margin-top: 10px; }

/* ---------- 头部 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.logo img { display: block; }
.main-nav ul { display: flex; gap: 6px; }
.main-nav a {
  display: block; padding: 8px 16px;
  font-size: 15px; color: #333; border-radius: 6px;
}
.main-nav a:hover { color: var(--primary); background: #fff5ee; }
.main-nav a.active { color: var(--primary); font-weight: 600; }
.header-cta { margin-left: 10px; }
.nav-toggle { display: none; border: 0; background: none; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: #333; margin: 5px 0; border-radius: 2px; transition: .3s; }

/* ---------- Hero ---------- */
.hero { background: linear-gradient(120deg, #E1FCFF, #BFD4FF 38%, #DEC5FF 76%, #D2D6FF); overflow: hidden; }
.hero-inner { display: flex; align-items: center; gap: 48px; padding-top: 72px; padding-bottom: 72px; }
.hero-text { flex: 1; }
.hero h1 { font-size: 40px; line-height: 1.35; font-weight: 700; color: #111; }
.hero h1 em { font-style: normal; color: var(--primary); }
.hero-sub { margin-top: 16px; font-size: 17px; color: #445; }
.hero-actions { margin-top: 30px; display: flex; gap: 14px; flex-wrap: wrap; }
.hero-img { flex: 1; }
.hero-img img { border-radius: 14px; box-shadow: var(--shadow-lg); width: 100%; }

/* ---------- 区块 ---------- */
.section { padding: 64px 0; }
.section-alt { background: var(--bg-alt); }
.section-head { text-align: center; margin-bottom: 40px; }
.section-head h2 { font-size: 30px; font-weight: 700; }
.section-head p { margin-top: 10px; color: var(--gray); font-size: 15px; }
.section-note { margin-top: 20px; text-align: center; color: var(--gray-light); font-size: 13px; }

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }

/* 核心能力卡片 */
.feature-card { padding: 28px 24px; text-align: center; transition: transform .2s, box-shadow .2s; }
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.feature-icon {
  width: 58px; height: 58px; margin: 0 auto 16px;
  border-radius: 14px; color: #fff; font-size: 24px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.fi-ai { background: linear-gradient(135deg, #FF6A00, #FFB25C); }
.fi-ding { background: linear-gradient(135deg, #1366EC, #5AA2FF); }
.fi-globe { background: linear-gradient(135deg, #00B79D, #4CE0C0); }
.fi-safe { background: linear-gradient(135deg, #5B4BFF, #9B8FFF); }
.feature-card h3 { font-size: 18px; margin-bottom: 10px; }
.feature-card p { color: var(--gray); font-size: 14px; }

/* 产品卡 */
.product-card { padding: 28px 26px; position: relative; display: flex; flex-direction: column; transition: transform .2s, box-shadow .2s; }
.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.product-tag {
  display: inline-block; align-self: flex-start;
  background: #fff3e8; color: var(--primary-dark);
  font-size: 12px; padding: 3px 10px; border-radius: 20px; margin-bottom: 12px;
  border: 1px solid #ffd9b8;
}
.product-card h3 { font-size: 22px; }
.product-en { color: var(--gray-light); font-size: 12px; letter-spacing: 1px; margin: 4px 0 14px; }
.product-price { display: flex; align-items: baseline; gap: 4px; color: var(--primary-dark); }
.p-rmb { font-size: 18px; font-weight: 700; }
.p-num { font-size: 38px; font-weight: 700; line-height: 1.1; }
.p-unit { font-size: 13px; color: var(--gray); }
.product-single { color: #e04e00; font-size: 13px; margin-top: 2px; }
.product-intro { color: var(--gray); font-size: 14px; margin-top: 10px; }
.product-specs { margin-top: 16px; border-top: 1px dashed var(--border); padding-top: 12px; }
.product-specs li { padding: 4px 0 4px 18px; position: relative; font-size: 14px; color: #444; }
.product-specs li::before { content: "✓"; position: absolute; left: 0; color: var(--primary); font-weight: 700; }
.product-actions { margin-top: auto; }

/* 产品优势 */
.adv-list { display: flex; flex-direction: column; gap: 36px; }
.adv-item { display: flex; gap: 36px; align-items: center; }
.adv-item:nth-child(even) { flex-direction: row-reverse; }
.adv-img { flex: 1; }
.adv-img img { border-radius: 12px; box-shadow: var(--shadow); width: 100%; }
.adv-text { flex: 1; }
.adv-text h3 { font-size: 24px; margin-bottom: 12px; }
.adv-text p { color: #444; }
.link-more { display: inline-block; margin-top: 14px; color: var(--primary); font-weight: 600; }
.link-more:hover { color: var(--primary-dark); }

/* 安全卡 */
.security-card { padding: 0 0 22px; overflow: hidden; }
.security-card img { width: 100%; }
.security-card h3 { padding: 16px 20px 6px; font-size: 19px; }
.security-card p { padding: 0 20px; margin-top: 6px; color: #555; font-size: 14px; }

/* 案例 */
.case-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; }
.case-card { overflow: hidden; transition: transform .2s, box-shadow .2s; }
.case-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.case-img { aspect-ratio: 4/3; overflow: hidden; }
.case-img img { width: 100%; height: 100%; object-fit: cover; }
.case-body { padding: 14px 16px 18px; }
.case-logo { height: 26px; margin-bottom: 10px; }
.case-body p { font-size: 13px; color: #555; }

.research-band {
  margin-top: 36px; background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  display: flex; gap: 28px; align-items: center; padding: 24px; box-shadow: var(--shadow);
}
.research-band img { border-radius: 10px; }
.research-text h3 { font-size: 20px; margin-bottom: 8px; }
.research-text p { color: #555; }

/* 新闻 */
.news-card { overflow: hidden; transition: transform .2s, box-shadow .2s; }
.news-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.news-img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
.news-body { padding: 16px 18px 18px; }
.news-body h3 { font-size: 16px; line-height: 1.5; }
.news-body h3 a:hover { color: var(--primary); }
.news-summary { color: var(--gray); font-size: 13px; margin-top: 8px; }
.news-meta { color: var(--gray-light); font-size: 12px; margin-top: 10px; }

/* 置顶角标 */
.badge-top {
  display: inline-block; background: #FF6A00; color: #fff; font-size: 11px; line-height: 1;
  padding: 3px 7px; border-radius: 4px; margin-right: 6px; vertical-align: 2px; font-weight: normal;
}
.list-body h2 .badge-top { background: #FF6A00; }

/* CTA */
.cta-band { background: linear-gradient(120deg, #FF6A00, #FF9A3D); padding: 56px 0; }
.cta-inner { text-align: center; color: #fff; }
.cta-inner h2 { font-size: 28px; }
.cta-inner p { margin-top: 10px; opacity: .92; }
.cta-inner .hero-actions { justify-content: center; }

/* ---------- 页脚 ---------- */
.site-footer { background: #17191d; color: #aeb2bb; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.6fr; gap: 36px; padding: 48px 0 32px; }
.footer-col h4 { color: #fff; font-size: 16px; margin-bottom: 14px; }
.footer-col li { margin-bottom: 8px; font-size: 14px; }
.footer-col a:hover { color: #fff; }
.footer-about p { margin-top: 14px; font-size: 13px; line-height: 1.8; }
.footer-contact .f-contact-line { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; font-size: 14px; }
.footer-contact .f-label { color: #aeb2bb; font-size: 14px; white-space: nowrap; font-weight: 400; }
.num-img { border-radius: 4px; }
.footer-contact .num-img { height: auto; width: auto; max-width: 100%; border: none; background: transparent; box-shadow: none; }
.footer-bottom { border-top: 1px solid #2a2e36; padding: 18px 0 26px; text-align: center; font-size: 13px; color: #8b919c; }
.footer-bottom p { margin-bottom: 4px; }
.footer-addr { text-align: center; margin: 6px 0 4px; }
.footer-addr img { height: auto; width: auto; max-width: 100%; }
.footer-bottom a:hover { color: #fff; }
.footer-tip { font-size: 12px; opacity: .8; }

/* ---------- 页面横幅 ---------- */
.page-banner {
  background: linear-gradient(120deg, #E1FCFF, #BFD4FF 38%, #DEC5FF 76%, #D2D6FF);
  padding: 44px 0 40px;
}
.page-banner h1 { font-size: 30px; }
.page-banner p { margin-top: 8px; color: #445; font-size: 15px; }
.page-banner a:hover { color: var(--primary); }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; border-radius: var(--radius); }
.cmp-table, .spec-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: var(--radius); overflow: hidden; min-width: 640px; }
.cmp-table th {
  background: #1f2937; color: #fff; padding: 13px 16px; font-size: 14px; text-align: center;
}
.cmp-table th:first-child { text-align: left; }
.cmp-table td, .spec-table td { padding: 11px 16px; font-size: 14px; text-align: center; border-bottom: 1px solid var(--border); }
.cmp-table td:first-child { text-align: left; font-weight: 600; }
.cmp-table tr.even td, .spec-table tr.even td { background: #fafbfc; }
.cmp-key { color: #333; }
.spec-table td:first-child { width: 220px; }
.spec-table td:last-child { text-align: left; }

/* ---------- 产品详情 ---------- */
.pd-top { display: grid; grid-template-columns: 380px 1fr; gap: 28px; align-items: start; }
.pd-summary { padding: 30px; }
.mini-card { padding: 20px; }
.mini-icon { width: 40px; height: 40px; border-radius: 10px; background: #fff3e8; color: var(--primary-dark); font-weight: 700; display: flex; align-items: center; justify-content: center; margin-bottom: 10px; }
.mini-card h3 { font-size: 16px; margin-bottom: 6px; }
.mini-card p { font-size: 13px; color: var(--gray); }

/* ---------- 文章列表 ---------- */
.list-layout { display: grid; grid-template-columns: 1fr 300px; gap: 28px; align-items: start; }
.list-item { display: flex; gap: 20px; padding: 18px; margin-bottom: 18px; }
.list-thumb { width: 220px; flex-shrink: 0; }
.list-thumb img { width: 100%; aspect-ratio: 16/10; object-fit: cover; border-radius: 8px; }
.list-body h2 { font-size: 19px; line-height: 1.5; }
.list-body h2 a:hover { color: var(--primary); }
.list-summary { color: var(--gray); font-size: 14px; margin-top: 8px; }
.list-meta { color: var(--gray-light); font-size: 13px; margin-top: 12px; display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
.cat-name { background: #f0f2f5; padding: 1px 8px; border-radius: 4px; }
.read-more { color: var(--primary); margin-left: auto; font-weight: 600; }
.side-card { padding: 20px; margin-bottom: 18px; }
.side-card h3 { font-size: 16px; margin-bottom: 12px; padding-bottom: 10px; border-bottom: 1px solid var(--border); }
.side-cats li { padding: 6px 0; border-bottom: 1px dashed #f0f0f0; }
.side-cats li:last-child { border-bottom: 0; }
.side-cats a { font-size: 14px; color: #444; display: block; }
.side-cats a:hover, .side-cats a.active { color: var(--primary); }
.side-cta p { color: var(--gray); font-size: 13px; margin-bottom: 12px; }

/* ---------- 文章详情 ---------- */
.article-box { padding: 32px 36px; }
.article-title { font-size: 26px; line-height: 1.45; }
.article-meta { color: var(--gray-light); font-size: 13px; margin: 14px 0 20px; display: flex; gap: 18px; flex-wrap: wrap; }
.article-cover img { border-radius: 10px; width: 100%; margin-bottom: 20px; }
.article-content { font-size: 15.5px; color: #333; line-height: 1.95; }
.article-content h2 { font-size: 21px; margin: 28px 0 12px; padding-left: 12px; border-left: 4px solid var(--primary); }
.article-content h3 { font-size: 18px; margin: 22px 0 10px; }
.article-content p { margin-bottom: 14px; }
.article-content ul, .article-content ol { margin: 0 0 14px 1.4em; }
.article-content ul li, .article-content ol li { list-style: disc; margin-bottom: 6px; }
.article-content ol li { list-style: decimal; }
.article-content img { border-radius: 10px; margin: 8px 0; }
.article-content a { color: var(--blue); }
.article-content table { width: 100%; border-collapse: collapse; margin: 14px 0; }
.article-content table td, .article-content table th { border: 1px solid var(--border); padding: 8px 10px; font-size: 14px; }
.article-content blockquote { border-left: 4px solid #ffd9b8; background: #fff8f2; padding: 10px 16px; margin: 14px 0; color: #6b5d52; border-radius: 0 8px 8px 0; }
.article-source { margin-top: 24px; color: var(--gray-light); font-size: 13px; border-top: 1px dashed var(--border); padding-top: 14px; }
.related-box { padding: 22px 26px; margin-top: 18px; }
.related-box h3 { font-size: 17px; margin-bottom: 12px; }
.related-list li { padding: 7px 0 7px 16px; position: relative; border-bottom: 1px dashed #f0f0f0; }
.related-list li::before { content: "›"; position: absolute; left: 2px; color: var(--primary); }
.related-list a:hover { color: var(--primary); }

/* 关于我们 */
.about-box { padding: 36px 42px; }
.about-box h2 { font-size: 22px; margin: 26px 0 12px; color: var(--ink); }
.about-box h2:first-child { margin-top: 0; }
.about-box p { margin-bottom: 12px; color: #444; }
.about-box ul { margin: 0 0 14px 1.4em; }
.about-box ul li { list-style: disc; margin-bottom: 8px; color: #444; }

/* 联系页 - 客服板块 (v2 视觉) */
.contact-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; max-width: 1060px; margin: 0 auto; }
.contact-card-c {
  background: #fff; border-radius: 14px; overflow: hidden;
  box-shadow: 0 4px 18px rgba(15, 23, 42, .06); border: 1px solid #eef0f4;
  transition: transform .25s, box-shadow .25s;
}
.contact-card-c:hover { transform: translateY(-4px); box-shadow: 0 12px 30px rgba(255, 106, 0, .10); }
.cc-head { display: flex; align-items: center; gap: 14px; padding: 20px 24px; color: #fff; }
.cc-head-qq { background: linear-gradient(120deg, #12b7f5, #0d9be8); }
.cc-head-phone { background: linear-gradient(120deg, #FF6A00, #ff8f3d); }
.cc-icon {
  width: 46px; height: 46px; border-radius: 50%; background: rgba(255,255,255,.18);
  display: flex; align-items: center; justify-content: center; flex: 0 0 46px;
}
.cc-icon svg { display: block; }
.cc-head-text h3 { font-size: 18px; margin-bottom: 2px; }
.cc-head-text p { font-size: 12px; opacity: .92; }
.cc-body { padding: 22px 24px 24px; }
.cc-row {
  display: flex; align-items: center; flex-wrap: wrap; gap: 10px;
  padding: 11px 0; border-bottom: 1px dashed #eef0f4; font-size: 14px;
}
.cc-row:last-of-type { border-bottom: none; }
.cc-label { color: #5a6472; min-width: 70px; font-weight: 600; }
.cc-row .num-img-lg { height: auto; }
.cc-chat-btn {
  display: inline-block; background: linear-gradient(120deg, #12b7f5, #0d9be8);
  color: #fff; font-size: 12px; padding: 5px 14px; border-radius: 999px; text-decoration: none;
  transition: opacity .2s; white-space: nowrap;
}
.cc-chat-btn:hover { opacity: .85; color: #fff; }
.cc-chat-btn-wx { background: linear-gradient(120deg, #07c160, #06ad56); }
.cc-qr-box { text-align: center; padding: 18px 0 6px; }
.cc-qr-img { width: 150px; height: 150px; object-fit: contain; border-radius: 10px; border: 1px solid #e8eaee; background: #fff; box-shadow: 0 2px 10px rgba(15,23,42,.06); }
.cc-qr-tip { color: #8a94a3; font-size: 12px; margin-top: 8px; }
.cc-addr { color: #333; line-height: 1.6; }
.cc-tip { color: #98a1ad; font-size: 12px; line-height: 1.7; margin-top: 14px; }
.cc-cta { display: flex; gap: 12px; margin-top: 18px; }
.cc-btn-cta {
  flex: 1; text-align: center; background: linear-gradient(120deg, #FF6A00, #ff8f3d);
  color: #fff; font-size: 14px; padding: 11px 0; border-radius: 8px; text-decoration: none;
  transition: opacity .2s;
}
.cc-btn-cta:hover { opacity: .88; color: #fff; }
.cc-btn-cta-plain { background: #f0f2f5; color: #333; }
.cc-btn-cta-plain:hover { background: #e6e9ee; color: #333; }
.empty-tip { padding: 40px; text-align: center; color: var(--gray-light); }

@media (max-width: 900px) {
  .contact-wrap { grid-template-columns: 1fr; }
  .cc-head { padding: 16px 18px; }
  .cc-body { padding: 16px 18px 20px; }
}

/* 联系页 - 旧版兼容 (不再使用) */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; max-width: 1080px; margin: 0 auto; }

/* ---------- 分页 ---------- */
.pager { margin-top: 26px; text-align: center; }
.pager ul { display: inline-flex; gap: 6px; flex-wrap: wrap; }
.pager a {
  display: inline-block; min-width: 36px; padding: 7px 12px; text-align: center;
  border: 1px solid var(--border); border-radius: 6px; background: #fff; font-size: 14px; color: #444;
}
.pager a:hover { border-color: var(--primary); color: var(--primary); }
.pager a.active { background: var(--primary); border-color: var(--primary); color: #fff; }
.pager a.disabled { color: #ccc; pointer-events: none; }

/* ---------- 悬浮客服 ---------- */
.kefu-float {
  position: fixed; right: 18px; top: 300px; z-index: 999;
  display: flex; flex-direction: column; gap: 10px;
  cursor: grab; user-select: none;
}
.kefu-float:active { cursor: grabbing; }
.kefu-item {
  width: 64px; background: #fff; border: 1px solid var(--border); border-radius: 12px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, .12);
  display: flex; flex-direction: column; align-items: center; gap: 3px;
  padding: 9px 4px; transition: transform .2s, box-shadow .2s;
}
.kefu-item:hover { transform: translateY(-3px); box-shadow: 0 10px 26px rgba(0, 0, 0, .18); }
.kefu-item img { width: 30px; height: 30px; }
.kefu-item span { font-size: 12px; color: #444; }
.kefu-item.kefu-top { display: none; }
.kefu-item.kefu-top.show { display: flex; }

/* 弹窗 */
.modal-mask {
  position: fixed; inset: 0; z-index: 1000; background: rgba(0, 0, 0, .45);
  display: flex; align-items: center; justify-content: center; padding: 20px;
}
.modal-box {
  background: #fff; border-radius: 14px; padding: 30px 34px; width: 340px;
  max-width: 94vw; text-align: center; position: relative;
  animation: modalIn .22s ease;
}
@keyframes modalIn { from { transform: scale(.92); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.modal-close {
  position: absolute; top: 10px; right: 14px; border: 0; background: none;
  font-size: 24px; color: var(--gray-light); cursor: pointer; line-height: 1;
}
.modal-box h3 { font-size: 19px; margin-bottom: 6px; }
.modal-tip { color: var(--gray); font-size: 13px; margin-bottom: 14px; }
.modal-wx-img { margin: 12px 0; }
.modal-wx-img img { border-radius: 6px; }
.modal-copy { display: flex; align-items: center; justify-content: center; gap: 10px; }
.modal-wx-id { font-size: 17px; font-weight: 700; letter-spacing: 1px; }
.modal-tip2 { color: var(--gray-light); font-size: 12px; margin-top: 12px; }

/* ---------- 移动端适配 ---------- */
@media (max-width: 1024px) {
  .case-grid { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 900px) {
  .grid-3 { grid-template-columns: 1fr; max-width: 460px; margin: 0 auto; }
  .hero-inner { flex-direction: column; text-align: center; padding-top: 44px; padding-bottom: 48px; }
  .hero-actions { justify-content: center; }
  .hero h1 { font-size: 32px; }
  .adv-item, .adv-item:nth-child(even) { flex-direction: column; gap: 20px; }
  .pd-top { grid-template-columns: 1fr; }
  .list-layout { grid-template-columns: 1fr; }
  .list-thumb { width: 160px; }
  .research-band { flex-direction: column; text-align: center; }
  .list-meta .read-more { margin-left: 0; }
  .article-box { padding: 22px 18px; }
  .about-box { padding: 24px 20px; }
}
@media (max-width: 640px) {
  .header-inner { height: 60px; }
  .logo img { width: 170px; height: auto; }
  .nav-toggle { display: block; }
  .main-nav {
    display: none; position: absolute; top: 60px; left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--border);
    box-shadow: 0 10px 30px rgba(0, 0, 0, .1);
  }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; padding: 10px 16px 16px; }
  .main-nav a { padding: 12px 8px; font-size: 16px; border-bottom: 1px solid #f5f5f5; border-radius: 0; }
  .header-cta { display: none; }
  .hero h1 { font-size: 26px; }
  .hero-sub { font-size: 15px; }
  .section { padding: 44px 0; }
  .section-head h2 { font-size: 24px; }
  .grid-2, .grid-4 { grid-template-columns: 1fr; }
  .grid-3 { max-width: none; }
  .case-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .case-body { padding: 10px 12px 14px; }
  .case-body p { font-size: 12px; }
  .case-logo { height: 20px; }
  .footer-grid { grid-template-columns: 1fr; gap: 26px; padding: 36px 0 24px; }
  .cta-inner h2 { font-size: 22px; }
  .list-item { flex-direction: column; }
  .list-thumb { width: 100%; }
  .article-title { font-size: 21px; }
  .page-banner { padding: 32px 0; }
  .page-banner h1 { font-size: 24px; }
  .kefu-float { right: 10px; }
  .kefu-item { width: 56px; }
}