/* =========================================================
   中铁全媒 前台样式
   ========================================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary: #1a4fa0;
  --primary-dark: #0e3478;
  --primary-light: #2e69c8;
  --accent: #e8950a;
  --text: #2c3e50;
  --text-light: #666;
  --border: #e5e8ee;
  --bg-gray: #f5f7fa;
  --bg-dark: #1a2540;
  --white: #fff;
  --radius: 8px;
  --shadow: 0 2px 16px rgba(26,79,160,0.10);
  --transition: all 0.25s ease;
}

html { scroll-behavior: smooth; }
body { font-family: 'PingFang SC','Microsoft YaHei',sans-serif; color: var(--text); line-height: 1.7; font-size: 15px; }
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-light); }
img { max-width: 100%; display: block; }
ul { list-style: none; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.text-center { text-align: center; }
.mt-40 { margin-top: 40px; }
.py-60 { padding: 60px 0; }
.bg-gray { background: var(--bg-gray); }
.bg-dark { background: var(--bg-dark); }

/* ── 按钮 ── */
.btn-primary {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--primary); color: #fff;
  padding: 12px 28px; border-radius: 4px;
  font-size: 15px; font-weight: 500; border: none; cursor: pointer;
  transition: var(--transition);
}
.btn-primary:hover { background: var(--primary-light); color: #fff; }
.btn-primary.btn-large { padding: 14px 36px; font-size: 17px; }
.btn-primary.btn-block { width: 100%; justify-content: center; }
.btn-outline {
  display: inline-flex; align-items: center; gap: 6px;
  border: 2px solid var(--primary); color: var(--primary);
  padding: 10px 26px; border-radius: 4px; font-size: 15px; font-weight: 500;
  transition: var(--transition);
}
.btn-outline:hover { background: var(--primary); color: #fff; }

/* ── Header ── */
.site-header { position: sticky; top: 0; z-index: 100; background: #fff; box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
.header-top { background: var(--primary-dark); color: #b8cce8; padding: 6px 0; font-size: 13px; }
.header-top-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; }
.header-top .hotline strong { color: #ffc; font-size: 15px; }
.header-main { padding: 14px 0; }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.logo { display: flex; flex-direction: column; }
.logo-img { height: 52px; width: auto; display: block; object-fit: contain; }
.logo-text { font-size: 26px; font-weight: 800; color: var(--primary); letter-spacing: 2px; }
.logo-sub { font-size: 11px; color: var(--text-light); margin-top: -2px; }
.footer-logo-wrap { margin-bottom: 14px; }
.footer-logo-img { height: 42px; width: auto; display: block; object-fit: contain; }
.nav-toggle { display: none; background: none; border: none; font-size: 22px; color: var(--primary); cursor: pointer; }
.main-nav > ul { display: flex; gap: 6px; list-style: none; margin: 0; padding: 0; }
.main-nav > ul > li { position: relative; }
.main-nav > ul > li > a {
  display: block; padding: 8px 16px; font-size: 15px; font-weight: 500;
  color: var(--text); border-radius: 4px; transition: var(--transition);
  white-space: nowrap;
}
.main-nav > ul > li > a:hover,
.main-nav > ul > li > a.active { color: var(--primary); background: #eef3fb; }
.sub-nav {
  display: none !important; position: absolute; top: 100%; left: 0; background: #fff;
  min-width: 160px; border-radius: 6px; box-shadow: 0 6px 24px rgba(0,0,0,0.12);
  padding: 8px 0; z-index: 200; list-style: none; margin: 0;
  flex-direction: column;
}
.has-sub.open > .sub-nav { display: block !important; }
.sub-nav > li > a { display: block; padding: 8px 20px; font-size: 14px; font-weight: 400; color: var(--text); white-space: nowrap; }
.sub-nav > li > a:hover { color: var(--primary); background: #eef3fb; }

/* ── Banner ── */
.banner-section { position: relative; overflow: hidden; }
.banner-slider { position: relative; width: 100%; }
.banner-item { display: none; position: relative; }
.banner-item.active { display: block; }
.banner-item img { width: 100%; height: 480px; object-fit: cover; }
.banner-caption {
  position: absolute; bottom: 60px; left: 0; right: 0; text-align: center;
  color: #fff; text-shadow: 0 2px 8px rgba(0,0,0,0.5);
}
.banner-caption h2 { font-size: 32px; }
.banner-btn {
  position: absolute; top: 50%; transform: translateY(-50%);
  background: rgba(255,255,255,0.2); color: #fff; border: none;
  width: 44px; height: 44px; border-radius: 50%; font-size: 20px;
  cursor: pointer; transition: var(--transition); z-index: 10;
}
.banner-btn:hover { background: rgba(255,255,255,0.4); }
.banner-btn.prev { left: 16px; }
.banner-btn.next { right: 16px; }
.banner-dots { position: absolute; bottom: 16px; left: 50%; transform: translateX(-50%); display: flex; gap: 8px; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: rgba(255,255,255,0.5); cursor: pointer; transition: var(--transition); }
.dot.active { background: #fff; width: 24px; border-radius: 4px; }
.banner-default {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-light) 100%);
  padding: 100px 0; text-align: center; color: #fff;
}
.banner-default h1 { font-size: 36px; margin-bottom: 16px; }
.banner-default p { font-size: 18px; margin-bottom: 32px; opacity: 0.9; }

/* ── Section Title ── */
.section-title { text-align: center; margin-bottom: 40px; }
.section-title h2 { font-size: 28px; font-weight: 700; color: var(--text); position: relative; display: inline-block; }
.section-title h2::after {
  content: ''; display: block; width: 50px; height: 3px;
  background: var(--primary); margin: 10px auto 0;
}
.section-title p { color: var(--text-light); margin-top: 12px; font-size: 15px; }
.section-title.light h2 { color: #fff; }
.section-title.light h2::after { background: var(--accent); }
.section-title.light p { color: rgba(255,255,255,0.7); }

/* ── 类型筛选（新风格） ── */
.type-filter-section { padding: 0; }
.type-filter-bg {
  background: linear-gradient(135deg, #f0f4ff 0%, #e8f0fe 60%, #f5f7fa 100%);
  border-top: 1px solid #dde5f8;
  border-bottom: 1px solid #dde5f8;
  padding: 36px 0 40px;
}
.type-filter-header {
  display: flex; align-items: flex-end; justify-content: space-between;
  margin-bottom: 28px; gap: 16px; flex-wrap: wrap;
}
.type-filter-title h2 {
  font-size: 22px; font-weight: 700; color: var(--text);
  margin-bottom: 4px; letter-spacing: .5px;
}
.type-filter-title p { font-size: 13px; color: var(--text-light); margin: 0; }
.type-view-all {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 13px; color: var(--primary); font-weight: 500;
  white-space: nowrap; transition: var(--transition);
}
.type-view-all:hover { color: var(--primary-dark); gap: 8px; }

.type-tabs-wrap {
  display: flex; flex-wrap: wrap; gap: 12px;
}
.type-tab {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 10px 20px 10px 14px;
  background: #fff;
  border: 1.5px solid #dde5f8;
  border-radius: 50px;
  color: var(--text);
  font-size: 14px; font-weight: 500;
  transition: var(--transition);
  box-shadow: 0 2px 8px rgba(26,79,160,0.06);
  cursor: pointer;
  text-decoration: none;
}
.type-tab:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: #eef3fb;
  box-shadow: 0 4px 14px rgba(26,79,160,0.13);
  transform: translateY(-1px);
}
.type-tab-all {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(26,79,160,0.22);
}
.type-tab-all:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  color: #fff;
}
.type-tab-icon {
  display: flex; align-items: center; justify-content: center;
  width: 32px; height: 32px;
  border-radius: 50%;
  background: rgba(26,79,160,0.08);
  flex-shrink: 0;
}
.type-tab-all .type-tab-icon { background: rgba(255,255,255,0.25); }
.type-tab-icon i { font-size: 15px; }
.type-tab-name { white-space: nowrap; }

/* ── 媒体资源网格 ── */
.media-section { padding: 60px 0; }
.media-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 24px; }
.media-card {
  background: #fff; border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); transition: var(--transition); display: flex; flex-direction: column;
  border: 1px solid var(--border);
}
.media-card:hover { transform: translateY(-4px); box-shadow: 0 8px 32px rgba(26,79,160,0.15); }
.media-thumb { position: relative; aspect-ratio: 16/9; overflow: hidden; background: var(--bg-gray); }
.media-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; }
.media-card:hover .media-thumb img { transform: scale(1.05); }
.media-thumb-placeholder { width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; }
.media-thumb-placeholder i { font-size: 40px; color: #ccc; }
.media-tag {
  position: absolute; top: 10px; left: 10px;
  background: var(--primary); color: #fff; font-size: 12px; padding: 3px 10px; border-radius: 3px;
}
.media-info { padding: 16px; flex: 1; }
.media-info h3 { font-size: 15px; font-weight: 600; margin-bottom: 6px; color: var(--text); line-height: 1.4; }
.media-info h3:hover { color: var(--primary); }
.media-city { font-size: 13px; color: var(--text-light); display: block; margin-bottom: 6px; }
.media-info p { font-size: 13px; color: var(--text-light); }

/* ── 广告案例 ── */
.case-section { padding: 60px 0; }
.case-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; }
.case-grid-large { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 28px; }
.case-card {
  background: #fff; border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); transition: var(--transition); border: 1px solid var(--border);
}
.case-card:hover { transform: translateY(-4px); box-shadow: 0 8px 28px rgba(26,79,160,0.13); }
.case-card img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
.case-img-placeholder { width: 100%; aspect-ratio: 16/9; background: var(--bg-gray); display: flex; align-items: center; justify-content: center; }
.case-img-placeholder i { font-size: 40px; color: #ccc; }
.case-info { padding: 16px; }
.case-info h3 { font-size: 15px; font-weight: 600; margin-bottom: 6px; color: var(--text); }
.case-info p { font-size: 13px; color: var(--text-light); }

/* ── 百科 ── */
.wiki-section { padding: 60px 0; }
.wiki-list { display: flex; flex-direction: column; gap: 20px; }
.wiki-item { display: flex; gap: 20px; align-items: flex-start; padding: 20px; background: #fff; border-radius: var(--radius); border: 1px solid var(--border); transition: var(--transition); }
.wiki-item:hover { box-shadow: var(--shadow); border-color: var(--primary); }
.wiki-thumb { width: 100px; min-width: 100px; aspect-ratio: 4/3; overflow: hidden; border-radius: 6px; background: var(--bg-gray); }
.wiki-thumb img { width: 100%; height: 100%; object-fit: cover; }
.wiki-icon { width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; }
.wiki-icon i { font-size: 28px; color: var(--primary); }
.wiki-info h3 { font-size: 15px; font-weight: 600; margin-bottom: 8px; color: var(--text); }
.wiki-info p { font-size: 13px; color: var(--text-light); line-height: 1.6; }
.wiki-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; }
.wiki-card { background: #fff; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); transition: var(--transition); }
.wiki-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.wiki-card img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
.wiki-icon-lg { width: 100%; aspect-ratio: 16/9; background: var(--bg-gray); display: flex; align-items: center; justify-content: center; }
.wiki-icon-lg i { font-size: 40px; color: var(--primary); }
.wiki-card .wiki-info { padding: 16px; }

/* ── 优势 ── */
.advantage-section { padding: 60px 0; }
.adv-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 30px; }
.adv-item { text-align: center; color: rgba(255,255,255,0.9); padding: 20px; }
.adv-item i { font-size: 44px; color: var(--accent); margin-bottom: 16px; display: block; }
.adv-item h3 { font-size: 18px; color: #fff; margin-bottom: 10px; }
.adv-item p { font-size: 14px; line-height: 1.7; }

/* ── 页面Hero ── */
.page-hero { background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-light) 100%); padding: 40px 0; color: #fff; }
.page-hero h1 { font-size: 28px; font-weight: 700; margin-bottom: 10px; }
.breadcrumb { font-size: 13px; color: rgba(255,255,255,0.75); }
.breadcrumb a { color: rgba(255,255,255,0.85); }
.breadcrumb a:hover { color: #fff; }
.breadcrumb span { color: rgba(255,255,255,0.6); }

/* ── 媒体列表页布局 ── */
.media-main { padding: 20px 0 40px; }

/* ── 筛选栏（横向） ── */
.filter-bar { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 24px; margin-top: 28px; }
.filter-row { display: flex; align-items: flex-start; padding: 10px 0; border-bottom: 1px dashed var(--border); }
.filter-row:last-child { border-bottom: none; }
.filter-label { flex-shrink: 0; width: 80px; font-size: 14px; font-weight: 700; color: var(--text); line-height: 32px; }
.filter-options { flex: 1; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.filter-tag { display: inline-block; padding: 5px 14px; font-size: 13px; color: var(--text); border: 1px solid var(--border); border-radius: 4px; transition: var(--transition); white-space: nowrap; }
.filter-tag:hover, .filter-tag.active { background: var(--primary); color: #fff; border-color: var(--primary); }


/* 城市选择 Tab */
.filter-row-city { flex-direction: row; flex-wrap: wrap; align-items: center; }
.filter-row-city .filter-label { line-height: 32px; margin-bottom: 0; }
.city-label-actions { display: flex; align-items: center; gap: 10px; margin-right: 16px; flex-shrink: 0; }
.city-current { font-size: 14px; color: #e84e1b; font-weight: 600; }
.filter-options-city { flex-direction: column; align-items: flex-start; width: 100%; flex-basis: 100%; }
.city-tab-bar { display: flex; gap: 0; border-bottom: 2px solid var(--border); margin-bottom: 10px; width: 100%; }
.city-tab { padding: 8px 20px; font-size: 14px; font-weight: 500; color: var(--text-light); background: none; border: none; border-bottom: 2px solid transparent; margin-bottom: -2px; cursor: pointer; transition: var(--transition); white-space: nowrap; }
.city-tab:hover { color: var(--primary); }
.city-tab.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 600; }
.city-search-inline input { padding: 6px 12px; border: 1px solid var(--border); border-radius: 4px; font-size: 13px; width: 200px; margin-bottom: 10px; }
.city-tab-content { width: 100%; }
.city-panel { display: none; }
.city-panel.active { display: block; }
.city-panel .filter-tag { margin-bottom: 6px; }
.city-letter-group { margin-bottom: 8px; }
.city-letter { font-size: 12px; font-weight: 700; color: var(--primary); display: block; margin-bottom: 4px; }
.city-tags { display: flex; flex-wrap: wrap; gap: 4px; }
.city-tag { display: inline-block; padding: 4px 10px; font-size: 13px; border: 1px solid var(--border); border-radius: 3px; color: var(--text); transition: var(--transition); }
.city-tag:hover, .city-tag.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.no-city { font-size: 13px; color: var(--text-light); }

/* ── 详情页 ── */
.detail-layout { display: flex; gap: 28px; padding: 40px 0; }
.detail-main { flex: 1; min-width: 0; }
.detail-sidebar { width: 260px; min-width: 260px; }
.media-detail-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; display: flex; gap: 24px; padding: 24px; margin-bottom: 28px; flex-wrap: wrap; }
.media-detail-thumb { width: 320px; min-width: 200px; flex: 1; }
.media-detail-thumb img { width: 100%; border-radius: 6px; }
.media-detail-meta { flex: 1; min-width: 200px; }
.media-detail-meta h2 { font-size: 22px; font-weight: 700; margin-bottom: 12px; color: var(--text); }
.meta-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.tag-type, .tag-city { padding: 4px 12px; font-size: 13px; border-radius: 3px; }
.tag-type { background: var(--primary); color: #fff; }
.tag-city { background: var(--bg-gray); color: var(--text-light); }
.media-summary { color: var(--text-light); font-size: 14px; margin-bottom: 20px; line-height: 1.7; }
.consult-box { border-top: 1px solid var(--border); padding-top: 16px; }
.consult-box p { font-size: 13px; color: var(--text-light); margin-bottom: 10px; }
.content-block { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; margin-bottom: 24px; }
.content-block h3 { font-size: 18px; font-weight: 700; margin-bottom: 16px; padding-bottom: 10px; border-bottom: 2px solid var(--primary); color: var(--text); }
.article-content { line-height: 1.8; color: var(--text); }
.article-content img { max-width: 100%; border-radius: 6px; margin: 12px 0; }
.article-content p { margin-bottom: 14px; }
.article-content h2,.article-content h3,.article-content h4 { margin: 20px 0 10px; font-weight: 700; }
.detail-cover { margin-bottom: 24px; border-radius: 8px; overflow: hidden; }
.detail-cover img { width: 100%; max-height: 400px; object-fit: cover; }

/* 广告位表格 */
/* ── 广告点位卡片 ── */
.position-card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.position-card {
  border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; background: #fff; box-shadow: var(--shadow);
  display: flex; flex-direction: column; transition: var(--transition);
}
.position-card:hover { box-shadow: 0 8px 28px rgba(26,79,160,0.13); transform: translateY(-3px); }
.position-card-img { aspect-ratio: 16/9; overflow: hidden; background: var(--bg-gray); }
.position-card-img img { width: 100%; height: 100%; object-fit: cover; }
.position-card-body { padding: 16px; display: flex; flex-direction: column; flex: 1; gap: 10px; }
.position-card-title {
  font-size: 16px; font-weight: 700; color: var(--text);
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
}
.position-code {
  font-size: 11px; font-weight: 500; color: var(--primary);
  background: #eef3fb; border-radius: 3px; padding: 2px 7px;
}
.position-card-info { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; flex: 1; }
.position-card-info li { font-size: 13px; color: var(--text-light); display: flex; align-items: flex-start; gap: 6px; }
.position-card-info li i { color: var(--primary); margin-top: 2px; width: 14px; flex-shrink: 0; }
.position-card-info li span { color: var(--text); font-weight: 500; flex-shrink: 0; }
.position-card-footer {
  display: flex; align-items: center; justify-content: space-between;
  border-top: 1px solid var(--border); padding-top: 12px; gap: 10px; flex-wrap: wrap;
}
.position-price { font-size: 13px; color: var(--text-light); }
.position-price strong { font-size: 18px; color: #e84e1b; font-weight: 700; }
.position-discount {
  display: inline-block; background: #fff3e0; color: #e84e1b;
  font-size: 12px; font-style: normal; font-weight: 600;
  border-radius: 3px; padding: 1px 6px; margin-left: 4px;
}
.btn-consult {
  display: inline-flex; align-items: center; gap: 5px;
  background: var(--primary); color: #fff; border-radius: 4px;
  padding: 6px 14px; font-size: 13px; white-space: nowrap;
  transition: var(--transition);
}
.btn-consult:hover { background: var(--primary-dark); color: #fff; }

/* ── 侧边栏 ── */
.sidebar-block { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 20px; }
.sidebar-block h3 { font-size: 15px; font-weight: 700; margin-bottom: 16px; padding-bottom: 10px; border-bottom: 2px solid var(--primary); }
.contact-card { text-align: center; }
.contact-tip { font-size: 13px; color: var(--text-light); margin-bottom: 8px; }
.contact-phone { display: block; font-size: 22px; font-weight: 800; color: var(--primary); margin-bottom: 6px; }
.contact-name { font-size: 14px; color: var(--text-light); }
.related-list li { margin-bottom: 12px; }
.related-list li a { display: flex; gap: 10px; align-items: center; color: var(--text); font-size: 13px; }
.related-list li a:hover { color: var(--primary); }
.related-list li img { width: 60px; height: 45px; object-fit: cover; border-radius: 4px; flex-shrink: 0; }
.related-list li span { line-height: 1.4; }

/* ── 分页 ── */
.pagination { display: flex; justify-content: center; gap: 6px; margin-top: 36px; flex-wrap: wrap; }
.page-btn {
  display: inline-block; padding: 7px 14px; border: 1px solid var(--border);
  border-radius: 4px; font-size: 14px; color: var(--text); transition: var(--transition);
}
.page-btn:hover, .page-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.page-ellipsis { padding: 7px 10px; font-size: 14px; color: var(--text-light); }

/* ── 空状态 ── */
.empty-state { text-align: center; padding: 80px 20px; color: var(--text-light); }
.empty-state i { font-size: 48px; color: #ccc; margin-bottom: 16px; display: block; }
.empty-state p { font-size: 15px; margin-bottom: 20px; }

/* ── 关于我们 ── */
.about-layout { display: flex; gap: 40px; }
.about-main { flex: 1; }
.about-intro { margin-bottom: 40px; }
.about-intro h2 { font-size: 24px; font-weight: 700; margin-bottom: 16px; color: var(--primary); }
.about-intro p { margin-bottom: 14px; color: var(--text); line-height: 1.8; }
.about-strengths h2 { font-size: 22px; font-weight: 700; margin-bottom: 20px; }
.strength-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.strength-item { padding: 24px; background: var(--bg-gray); border-radius: var(--radius); }
.strength-item i { font-size: 32px; color: var(--primary); margin-bottom: 12px; display: block; }
.strength-item h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.strength-item p { font-size: 14px; color: var(--text-light); }
.about-sidebar { width: 260px; min-width: 260px; }
.contact-info-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.contact-info-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 16px; padding-bottom: 10px; border-bottom: 2px solid var(--primary); }
.contact-line { display: flex; gap: 12px; margin-bottom: 16px; align-items: flex-start; }
.contact-line i { font-size: 18px; color: var(--primary); margin-top: 4px; }
.contact-line span { display: block; font-size: 12px; color: var(--text-light); margin-bottom: 4px; }
.contact-line a { font-size: 20px; font-weight: 800; color: var(--primary); display: block; }
.mt-20 { margin-top: 20px; }

/* ── 悬浮按钮组 ── */
.float-group {
  position: fixed; right: 20px; bottom: 80px; z-index: 999;
  display: flex; flex-direction: column; gap: 8px;
}
.float-btn {
  display: flex; flex-direction: column; align-items: center;
  padding: 14px 12px; border-radius: 8px;
  font-size: 12px; gap: 4px; cursor: pointer; border: none;
  box-shadow: 0 4px 16px rgba(26,79,160,0.3); transition: var(--transition);
}
.float-btn i { font-size: 20px; }
.float-btn-contact { background: var(--primary); color: #fff; }
.float-btn-contact:hover { background: var(--primary-light); color: #fff; transform: scale(1.05); }
.float-btn-top { background: #fff; color: var(--primary); border: 1px solid var(--border); }
.float-btn-top:hover { background: var(--primary); color: #fff; transform: scale(1.05); }

/* ── Footer ── */
.site-footer { background: #1a2540; color: rgba(255,255,255,0.75); margin-top: 0; }
.footer-main { padding: 50px 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 40px; }
.footer-col h3 { font-size: 16px; color: #fff; font-weight: 700; margin-bottom: 16px; }
.footer-col p { font-size: 14px; line-height: 1.7; margin-bottom: 8px; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { font-size: 14px; color: rgba(255,255,255,0.65); transition: var(--transition); }
.footer-col ul li a:hover { color: #fff; }
.footer-col i { margin-right: 8px; color: var(--accent); }
.footer-wechat { margin-top: 10px; text-align: center; }
.footer-wechat img { width: 110px; height: 110px; border-radius: 6px; border: 2px solid rgba(255,255,255,0.15); display: block; margin: 0 auto 6px; }
.footer-wechat span { font-size: 12px; color: rgba(255,255,255,0.6); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding: 16px 0; text-align: center; font-size: 13px; }
.footer-bottom a { color: rgba(255,255,255,0.6); }
.footer-bottom a:hover { color: #fff; }

/* ══════════════════════════════════════════
   响应式
   ══════════════════════════════════════════ */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
  .filter-label { width: 70px; }
}

@media (max-width: 768px) {
  .header-top .slogan { display: none; }
  .nav-toggle { display: block; }
  .main-nav {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    background: #fff; box-shadow: 0 6px 20px rgba(0,0,0,0.1); padding: 10px 0; z-index: 300;
  }
  .main-nav.open { display: block; }
  .main-nav > ul { flex-direction: column; }
  .main-nav > ul > li > a { padding: 12px 20px; }
  .sub-nav { display: none !important; position: static !important; box-shadow: none; padding: 0 0 0 20px; }
  .has-sub.open > .sub-nav { display: block !important; }
  .banner-section { overflow-x: hidden; }
  .banner-item img { height: 220px; max-width: 100%; }
  .banner-caption h2 { font-size: 18px; }
  .banner-default { padding: 60px 0; }
  .banner-default h1 { font-size: 22px; }
  .page-hero + .container { padding-top: 28px; }
  .media-page-layout { flex-direction: column; padding: 20px 0; }
  .filter-row { flex-direction: column; }
  .filter-label { width: auto; margin-bottom: 6px; line-height: unset; }
  .filter-row-city { flex-direction: column; align-items: flex-start; }
  .city-label-actions { margin-bottom: 6px; margin-right: 0; }
  .city-tab { padding: 6px 12px; font-size: 13px; }
  .detail-layout { flex-direction: column; padding: 20px 0; }
  .detail-sidebar { width: 100%; min-width: unset; }
  .about-layout { flex-direction: column; }
  .about-sidebar { width: 100%; }
  .strength-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .media-detail-card { flex-direction: column; }
  .media-detail-thumb { width: 100%; }
  .type-grid { grid-template-columns: repeat(3, 1fr); }
  .section-title h2 { font-size: 22px; }
  .adv-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .container { padding: 0 15px; }
  .type-grid { grid-template-columns: repeat(2, 1fr); }
  .media-grid { grid-template-columns: 1fr; }
  .case-grid, .case-grid-large { grid-template-columns: 1fr; }
  .adv-grid { grid-template-columns: 1fr; }
  .banner-default h1 { font-size: 18px; }
  .page-hero h1 { font-size: 20px; }
  .position-card-grid { grid-template-columns: 1fr; }
}

/* 上一篇 / 下一篇 */
.article-nav {
  display: flex;
  border-top: 1px solid var(--border);
  margin-top: 32px;
}
.article-nav-item {
  flex: 1;
  padding: 14px 18px;
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.5;
  transition: background .2s;
}
.article-nav-item:first-child { border-right: 1px solid var(--border); }
.article-nav-item .nav-label {
  display: block;
  font-size: 12px;
  color: var(--primary);
  margin-bottom: 4px;
  font-weight: 600;
}
.article-nav-item a {
  color: var(--text);
  text-decoration: none;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.article-nav-item a:hover { color: var(--primary); }
.article-nav-item.nav-none { color: #bbb; font-style: italic; }

/* ── 相关问题 / 问答气泡（仿微信聊天） ── */
.qa-chat {
  background: #f0f2f5;
  border-radius: 12px;
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.qa-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.qa-row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}
/* 问题行：头像在左，气泡在左 */
.qa-question { flex-direction: row; }
/* 答案行：整体靠右，头像在右 */
.qa-answer { flex-direction: row; justify-content: flex-end; }

.qa-avatar {
  width: 38px; height: 38px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}
.qa-avatar-q {
  background: var(--primary);
  color: #fff;
}
.qa-avatar-a {
  background: #07c160;
  color: #fff;
}

.qa-bubble {
  max-width: 75%;
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 14px;
  line-height: 1.7;
  position: relative;
  word-break: break-word;
  white-space: pre-wrap;
}
/* 问题气泡：白色，左侧小三角 */
.qa-bubble-q {
  background: #fff;
  color: var(--text);
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
  border-radius: 0 10px 10px 10px;
}
.qa-bubble-q::before {
  content: '';
  position: absolute;
  top: 10px; left: -7px;
  border: 7px solid transparent;
  border-right-color: #fff;
  border-left: none;
}
/* 答案气泡：绿色，右侧小三角 */
.qa-bubble-a {
  background: #95ec69;
  color: #222;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
  border-radius: 10px 0 10px 10px;
}
.qa-bubble-a::after {
  content: '';
  position: absolute;
  top: 10px; right: -7px;
  border: 7px solid transparent;
  border-left-color: #95ec69;
  border-right: none;
}

@media (max-width: 600px) {
  .qa-bubble { max-width: 85%; }
}

/* ── 列表页搜索 ── */
.list-search-bar {
  display: flex; gap: 10px; align-items: center;
  margin-bottom: 20px; flex-wrap: wrap;
}
.list-search-input {
  flex: 1; min-width: 200px; padding: 10px 16px;
  border: 1px solid var(--border); border-radius: 4px;
  font-size: 14px; transition: var(--transition);
}
.list-search-input:focus {
  outline: none; border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26,79,160,0.12);
}
.list-search-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 22px; background: var(--primary); color: #fff;
  border: none; border-radius: 4px; font-size: 14px; font-weight: 500;
  cursor: pointer; transition: var(--transition); white-space: nowrap;
}
.list-search-btn:hover { background: var(--primary-dark); }
.list-search-clear {
  font-size: 13px; color: var(--text-light); white-space: nowrap;
  transition: var(--transition);
}
.list-search-clear:hover { color: var(--primary); }
.list-search-tip {
  font-size: 13px; color: var(--text-light); margin-bottom: 16px;
}
.list-search-tip strong { color: var(--primary); }

/* ── 站点地图 ── */
.sitemap-wrap { display: flex; flex-direction: column; gap: 36px; }
.sitemap-section { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 24px 28px; }
.sitemap-section h2 { font-size: 18px; font-weight: 700; color: var(--primary); margin-bottom: 16px; padding-bottom: 10px; border-bottom: 2px solid var(--primary); display: flex; align-items: center; gap: 8px; }
.sitemap-section h2 i { font-size: 20px; }
.sitemap-list { list-style: none; margin: 0; padding: 0; }
.sitemap-list li { padding: 6px 0; border-bottom: 1px dashed var(--border); }
.sitemap-list li:last-child { border-bottom: none; }
.sitemap-list li a { color: var(--text); font-size: 14px; transition: var(--transition); }
.sitemap-list li a:hover { color: var(--primary); padding-left: 6px; }
.sitemap-list.sitemap-cols { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0 32px; }
@media (max-width: 1024px) { .sitemap-list.sitemap-cols { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 768px) { .sitemap-list.sitemap-cols { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .sitemap-list.sitemap-cols { grid-template-columns: 1fr; } }

/* ── 404 页面 ── */
.error-page { padding: 80px 0; text-align: center; }
.error-content { max-width: 520px; margin: 0 auto; }
.error-code { font-size: 120px; font-weight: 800; color: var(--primary); line-height: 1; opacity: 0.15; }
.error-title { font-size: 28px; font-weight: 700; color: var(--text); margin: -20px 0 12px; }
.error-desc { font-size: 16px; color: var(--text-light); margin-bottom: 36px; }
.error-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.error-btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 28px; border-radius: var(--radius); font-size: 15px; font-weight: 500; transition: var(--transition); }
.error-btn-primary { background: var(--primary); color: #fff; }
.error-btn-primary:hover { background: var(--primary-dark); color: #fff; }
.error-btn-default { background: var(--bg-gray); color: var(--text); border: 1px solid var(--border); }
.error-btn-default:hover { border-color: var(--primary); color: var(--primary); }
@media (max-width: 480px) {
  .error-code { font-size: 80px; }
  .error-title { font-size: 22px; }
}