/* 骨架 f4：商务企业风（品牌条 + 服务模块网格 + 直角细边框）
   特征：全部直角、细分隔线、英文小标、首页先服务模块后内容 */
.f4-wrap { max-width: var(--width); margin: 0 auto; padding: 0 20px; }

.f4-hd { background: var(--card); border-bottom: 1px solid var(--line); }
.f4-hd-in { display: flex; align-items: center; gap: 28px; min-height: 72px; flex-wrap: wrap; }
.f4-logo { display: flex; align-items: center; gap: 11px; }
.f4-logo-m { width: 34px; height: 34px; background: var(--brand); color: #fff; font-size: 18px; font-weight: 700; display: flex; align-items: center; justify-content: center; }
.f4-logo-t { display: flex; flex-direction: column; gap: 2px; line-height: 1.2; }
.f4-logo-t b { font-size: 18px; color: var(--txt); letter-spacing: .5px; }
.f4-logo-t i { font-style: normal; font-size: 10px; letter-spacing: 1.6px; color: #9ca3af; }
.f4-nav { display: flex; gap: 2px; margin-left: auto; }
.f4-nav a { padding: 10px 14px; font-size: 14px; color: var(--mut); border-bottom: 2px solid transparent; }
.f4-nav a:hover { color: var(--brand); }
.f4-nav a.on { color: var(--brand); border-bottom-color: var(--brand); }
.f4-cta { background: var(--brand); color: #fff; font-size: 13.5px; padding: 10px 18px; }
.f4-cta:hover { background: var(--brand-d); }
.f4-cta span { margin-left: 6px; }

.f4-banner { background: linear-gradient(120deg, #0b1220 0%, #16233a 52%, var(--brand-d) 100%); color: #fff; position: relative; overflow: hidden; }
.f4-banner::after { content: ''; position: absolute; inset: 0; background-image: linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px); background-size: 56px 56px; pointer-events: none; }
.f4-banner-in { padding: 54px 20px 40px; position: relative; z-index: 1; }
.f4-banner-k { font-size: 11px; letter-spacing: 3px; color: rgba(255,255,255,.55); margin-bottom: 12px; }
.f4-banner h1 { font-size: 36px; line-height: 1.35; letter-spacing: 1px; }
.f4-banner-p { max-width: 680px; margin-top: 14px; font-size: 14.5px; line-height: 1.9; color: rgba(255,255,255,.72); }
.f4-banner-b { display: flex; gap: 12px; margin-top: 24px; flex-wrap: wrap; }
.f4-b1, .f4-b2 { padding: 11px 24px; font-size: 14px; }
.f4-b1 { background: #fff; color: #0b1220; }
.f4-b1:hover { background: var(--brand-l); }
.f4-b2 { border: 1px solid rgba(255,255,255,.4); color: #fff; }
.f4-b2:hover { border-color: #fff; background: rgba(255,255,255,.08); }
.f4-kpis { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; margin-top: 34px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.16); }
.f4-kpi b { display: block; font-size: 26px; font-weight: 600; letter-spacing: .5px; }
.f4-kpi span { display: block; margin-top: 4px; font-size: 12px; color: rgba(255,255,255,.55); }

.f4-main { padding-top: 26px; padding-bottom: 12px; }
.f4-crumb { font-size: 12.5px; color: var(--mut); padding: 16px 0 14px; }
.f4-crumb a { color: var(--mut); }
.f4-crumb a:hover { color: var(--brand); }
.f4-crumb span { margin: 0 7px; color: #cbd5e1; }

.f4-mods { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; border: 1px solid var(--line); background: var(--card); }
.f4-mod { padding: 22px 20px 20px; border-right: 1px solid var(--line); display: block; position: relative; }
.f4-mod:last-child { border-right: 0; }
.f4-mod::before { content: ''; position: absolute; left: 0; top: 0; width: 100%; height: 3px; background: transparent; }
.f4-mod:hover::before { background: var(--brand); }
.f4-mod:hover { background: #fbfcfd; }
.f4-mod-n { font-family: Georgia, serif; font-size: 12px; color: #cbd5e1; letter-spacing: 1px; }
.f4-mod h3 { font-size: 17px; margin: 10px 0 8px; color: var(--txt); }
.f4-mod p { font-size: 12.5px; line-height: 1.8; color: var(--mut); min-height: 44px; }
.f4-mod i { font-style: normal; font-size: 12px; color: var(--brand); }

.f4-two { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 22px; margin-top: 22px; align-items: start; }
.f4-block { background: var(--card); border: 1px solid var(--line); }
.f4-block-wide { margin-top: 22px; }
.f4-block-h { display: flex; align-items: center; justify-content: space-between; padding: 14px 18px; border-bottom: 1px solid var(--line); }
.f4-block-h h2 { font-size: 15.5px; letter-spacing: .5px; }
.f4-block-h h2::before { content: ''; display: inline-block; width: 3px; height: 14px; background: var(--brand); margin-right: 9px; vertical-align: -2px; }
.f4-block-h a { font-size: 12.5px; color: var(--brand); }

.f4-news { list-style: none; padding: 4px 18px 10px; }
.f4-news li { display: flex; gap: 16px; padding: 15px 0; border-bottom: 1px solid var(--line); }
.f4-news li:last-child { border-bottom: 0; }
.f4-date { flex: none; width: 52px; text-align: center; border-right: 1px solid var(--line); padding-right: 10px; font-size: 15px; color: var(--txt); font-weight: 600; line-height: 1.3; }
.f4-date i { display: block; font-style: normal; font-size: 10.5px; color: #9ca3af; font-weight: 400; margin-top: 3px; }
.f4-news-b { min-width: 0; }
.f4-news-b a { font-size: 15px; line-height: 1.55; color: var(--txt); font-weight: 500; }
.f4-news-b a:hover { color: var(--brand); }
.f4-news-b p { font-size: 12.5px; line-height: 1.8; color: var(--mut); margin-top: 5px; }
.f4-news-m { font-size: 11.5px !important; color: #a1a1aa !important; margin-top: 6px !important; }
.f4-news-lg li { padding: 18px 0; }
.f4-news-lg .f4-news-b a { font-size: 16.5px; }
.f4-more { display: flex; gap: 16px; padding: 4px 18px 16px; font-size: 13px; }
.f4-more a { color: var(--brand); }

.f4-rank { list-style: none; padding: 6px 18px 12px; }
.f4-rank li { display: flex; gap: 12px; padding: 11px 0; border-bottom: 1px dashed var(--line); }
.f4-rank li:last-child { border-bottom: 0; }
.f4-rank-n { flex: none; width: 22px; height: 22px; background: #f1f5f9; color: #94a3b8; font-size: 11.5px; font-weight: 700; display: flex; align-items: center; justify-content: center; margin-top: 2px; }
.f4-rank-n.hot { background: var(--brand); color: #fff; }
.f4-rank a { font-size: 14px; line-height: 1.55; color: var(--txt); }
.f4-rank a:hover { color: var(--brand); }
.f4-rank p { font-size: 11.5px; color: #9ca3af; margin-top: 3px; }
.f4-rank em { font-style: normal; display: block; font-size: 11.5px; color: #9ca3af; margin-top: 4px; }
.f4-rank-lg li { padding: 18px 0; gap: 16px; }
.f4-rank-lg .f4-rank-n { width: 30px; height: 30px; font-size: 13px; }
.f4-rank-lg a { font-size: 16.5px; }
.f4-rank-lg p { font-size: 13px; line-height: 1.8; color: var(--mut); margin-top: 5px; }

.f4-tagrow { padding: 14px 18px 18px; }
.f4-tagrow a { display: inline-block; font-size: 12.5px; padding: 5px 12px; margin: 0 8px 8px 0; border: 1px solid var(--line); color: var(--mut); background: var(--card); }
.f4-tagrow a:hover { border-color: var(--brand); color: var(--brand); }
.f4-tagrow-lg a { padding: 7px 14px; }
.f4-sites { list-style: none; padding: 8px 18px 14px; }
.f4-sites li { padding: 6px 0; font-size: 13.5px; border-bottom: 1px dotted var(--line); }
.f4-sites li:last-child { border-bottom: 0; }
.f4-sites a { color: var(--mut); }
.f4-sites a:hover { color: var(--brand); }

.f4-listwrap { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 22px; align-items: start; }
.f4-page { background: var(--card); border: 1px solid var(--line); }
.f4-page-wide { max-width: 100%; }
.f4-page-h { padding: 22px 22px 16px; border-bottom: 1px solid var(--line); }
.f4-page-h .f4-banner-k { color: #9ca3af; margin-bottom: 8px; }
.f4-page-h h1 { font-size: 25px; letter-spacing: .5px; }
.f4-page-h span { display: block; margin-top: 8px; font-size: 12.5px; color: var(--mut); }
.f4-sub { font-size: 14px; letter-spacing: 1px; padding: 20px 22px 0; color: var(--mut); }
.f4-sub::before { content: ''; display: inline-block; width: 3px; height: 12px; background: var(--brand); margin-right: 8px; vertical-align: -1px; }

.f4-pager { display: flex; gap: 6px; justify-content: center; padding: 16px 18px 20px; flex-wrap: wrap; }
.f4-pager a, .f4-pager span.on { min-width: 34px; text-align: center; padding: 7px 11px; font-size: 13px; border: 1px solid var(--line); color: var(--txt); }
.f4-pager a:hover { border-color: var(--brand); color: var(--brand); }
.f4-pager span.on { background: var(--brand); border-color: var(--brand); color: #fff; }

.f4-linkgrid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; padding: 14px 22px 4px; }
.f4-linkgrid a { border: 1px solid var(--line); margin: -1px 0 0 -1px; padding: 12px 14px; display: flex; flex-direction: column; gap: 3px; }
.f4-linkgrid a:hover { background: var(--brand-l); }
.f4-linkgrid b { font-size: 13.5px; font-weight: 500; color: var(--txt); }
.f4-linkgrid span { font-size: 11px; color: #a1a1aa; }

.f4-art { max-width: 880px; margin: 0 auto; background: var(--card); border: 1px solid var(--line); }
.f4-art-hd { padding: 26px 30px 20px; border-bottom: 1px solid var(--line); }
.f4-art-hd .f4-banner-k { color: var(--brand); margin-bottom: 10px; }
.f4-art h1 { font-size: 27px; line-height: 1.45; letter-spacing: .5px; }
.f4-art-meta { display: flex; gap: 18px; flex-wrap: wrap; font-size: 12px; color: #9ca3af; margin-top: 14px; }
.f4-art-cover img { width: 100%; display: block; }
.f4-art-body { padding: 24px 30px 8px; }
.f4-art-body p { font-size: 15.5px; line-height: 1.95; color: #374151; margin: 12px 0; }
.f4-art-body h2 { font-size: 18px; margin: 26px 0 12px; padding-left: 11px; border-left: 3px solid var(--brand); }
.f4-art-body h3 { font-size: 16px; margin: 20px 0 8px; }
.f4-art-tags { border-top: 1px solid var(--line); margin: 14px 30px 0; padding: 16px 0 22px; }
.f4-art-note { padding: 0 30px; font-size: 13px; color: var(--mut); line-height: 1.9; margin: 8px 0; }

.f4-pn { max-width: 880px; margin: 18px auto 0; display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.f4-pn a { background: var(--card); border: 1px solid var(--line); padding: 12px 16px; display: flex; flex-direction: column; gap: 5px; }
.f4-pn a:hover { border-color: var(--brand); }
.f4-pn span { font-size: 10px; letter-spacing: 2px; color: #9ca3af; }
.f4-pn b { font-size: 13.5px; font-weight: 500; color: var(--txt); line-height: 1.5; }
.f4-pn-n { text-align: right; }
.f4-two-art { margin-top: 18px; }
.f4-rel { list-style: none; padding: 6px 18px 14px; }
.f4-rel li { padding: 8px 0; border-bottom: 1px dashed var(--line); font-size: 13.5px; }
.f4-rel li:last-child { border-bottom: 0; }
.f4-rel a { color: var(--txt); }
.f4-rel a:hover { color: var(--brand); }

.f4-ft { margin-top: 44px; background: var(--card); border-top: 1px solid var(--line); }
.f4-ft-top { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 26px; padding: 30px 20px 26px; }
.f4-ft-b b { font-size: 17px; letter-spacing: .5px; }
.f4-ft-b p { font-size: 12.5px; color: var(--mut); line-height: 1.9; margin-top: 10px; }
.f4-ft-col h4 { font-size: 12px; letter-spacing: 2px; color: #9ca3af; margin-bottom: 10px; font-weight: 400; }
.f4-ft-col a { display: block; font-size: 12.5px; color: var(--mut); padding: 4px 0; }
.f4-ft-col a:hover { color: var(--brand); }
.f4-ft-bt { background: #0f172a; color: rgba(255,255,255,.45); font-size: 11.5px; padding: 12px 0; }

@media (max-width: 980px) {
  .f4-mods { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .f4-mod:nth-child(2) { border-right: 0; }
  .f4-mod:nth-child(3), .f4-mod:nth-child(4) { border-top: 1px solid var(--line); }
  .f4-two, .f4-listwrap { grid-template-columns: 1fr; }
  .f4-banner h1 { font-size: 27px; }
  .f4-kpis { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .f4-linkgrid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .f4-ft-top { grid-template-columns: 1fr; }
  .f4-pn { grid-template-columns: 1fr; }
  .f4-art-hd, .f4-art-body { padding-left: 18px; padding-right: 18px; }
  .f4-art h1 { font-size: 22px; }
  .f4-nav { margin-left: 0; }
  .f4-cta { display: none; }
}