/* 骨架 f6：左侧导航（固定左侧菜单 + 右侧内容区）
   特征：全站左侧竖排导航，内容区独立滚动；与其它骨架的顶栏结构完全不同 */
.f6-top { background: var(--txt); color: rgba(255,255,255,.6); font-size: 11.5px; }
.f6-top-in { max-width: var(--width); margin: 0 auto; padding: 0 20px; display: flex; align-items: center; justify-content: space-between; height: 32px; gap: 16px; }
.f6-top-b { color: rgba(255,255,255,.85); letter-spacing: .5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.f6-top-r { display: flex; gap: 12px; align-items: center; white-space: nowrap; }
.f6-top-r a { color: rgba(255,255,255,.55); }
.f6-top-r a:hover { color: #fff; }
.f6-top-r i { font-style: normal; color: rgba(255,255,255,.35); }

.f6-shell { max-width: var(--width); margin: 0 auto; display: flex; align-items: flex-start; min-height: calc(100vh - 32px); }
.f6-side { width: 226px; flex: none; background: var(--card); border-right: 1px solid var(--line); padding: 24px 16px 20px; position: sticky; top: 0; max-height: 100vh; overflow-y: auto; }
.f6-logo { display: flex; flex-direction: column; gap: 3px; padding: 0 6px 18px; border-bottom: 1px solid var(--line); margin-bottom: 14px; }
.f6-logo-s { width: 40px; height: 40px; border-radius: var(--radius); background: var(--brand); color: #fff; font-size: 20px; font-weight: 700; display: flex; align-items: center; justify-content: center; margin-bottom: 8px; }
.f6-logo b { font-size: 17px; color: var(--txt); letter-spacing: .5px; line-height: 1.35; }
.f6-logo i { font-style: normal; font-size: 11.5px; color: var(--mut); letter-spacing: 1px; }
.f6-menu { display: flex; flex-direction: column; gap: 3px; }
.f6-menu a { display: flex; align-items: center; gap: 10px; padding: 9px 10px; font-size: 14px; color: var(--txt); border-radius: var(--radius-s); }
.f6-menu a span { font-family: Georgia, serif; font-size: 11px; color: #b6bfca; width: 18px; }
.f6-menu a:hover { background: var(--brand-l); color: var(--brand); }
.f6-menu a.on { background: var(--brand); color: #fff; }
.f6-menu a.on span { color: rgba(255,255,255,.6); }
.f6-side-box { margin-top: 22px; padding-top: 16px; border-top: 1px solid var(--line); }
.f6-side-t { font-size: 11.5px; letter-spacing: 1.5px; color: #9ca3af; margin-bottom: 10px; }
.f6-side-box a { display: inline-block; font-size: 12px; padding: 3px 9px; margin: 0 6px 6px 0; border-radius: 999px; background: var(--bg); color: var(--mut); border: 1px solid var(--line); }
.f6-side-box a:hover { border-color: var(--brand); color: var(--brand); }
.f6-side-cp { font-size: 10.5px; color: #b6bfca; margin-top: 20px; line-height: 1.7; }

.f6-body { flex: 1; min-width: 0; padding: 20px 24px 0; }
.f6-main { max-width: 980px; }
.f6-crumb { font-size: 12.5px; color: var(--mut); margin-bottom: 14px; }
.f6-crumb a { color: var(--brand); }
.f6-crumb span { margin: 0 7px; color: #cbd5e1; }
.f6-eyebrow { font-size: 11px; letter-spacing: 3px; color: var(--brand); margin-bottom: 8px; }
.f6-head { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 24px; border-left: 5px solid var(--brand); }
.f6-head h1 { font-size: 27px; line-height: 1.35; letter-spacing: .5px; }
.f6-head p { font-size: 14px; color: var(--mut); line-height: 1.85; margin-top: 8px; }
.f6-kw { margin-top: 12px; }
.f6-kw a { display: inline-block; font-size: 12px; color: var(--brand); border: 1px solid var(--brand); border-radius: 999px; padding: 3px 11px; margin: 0 7px 7px 0; }
.f6-kw a:hover { background: var(--brand); color: #fff; }
.f6-head-sm { padding: 4px 2px 14px; }
.f6-head-sm h1 { font-size: 26px; letter-spacing: .5px; }
.f6-head-sm p { font-size: 12.5px; color: var(--mut); margin-top: 6px; }

.f6-board { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 16px; align-items: start; margin-top: 16px; }
.f6-panel { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); margin-top: 16px; overflow: hidden; }
.f6-board .f6-panel { margin-top: 0; }
.f6-panel-h { display: flex; align-items: center; justify-content: space-between; padding: 12px 16px; border-bottom: 1px solid var(--line); }
.f6-panel-h h2 { font-size: 15.5px; }
.f6-panel-h h2::before { content: ''; display: inline-block; width: 3px; height: 13px; background: var(--brand); margin-right: 9px; vertical-align: -2px; border-radius: 2px; }
.f6-panel-h a { font-size: 12.5px; color: var(--brand); }

.f6-news { list-style: none; padding: 4px 16px 8px; }
.f6-news li { display: flex; gap: 14px; padding: 13px 0; border-bottom: 1px dashed var(--line); }
.f6-news li:last-child { border-bottom: 0; }
.f6-news-i { flex: none; width: 26px; font-family: Georgia, serif; font-size: 13px; color: #c3cad3; padding-top: 2px; }
.f6-news-i.hot { color: var(--brand); font-weight: 700; }
.f6-news a { font-size: 15px; line-height: 1.6; color: var(--txt); font-weight: 500; }
.f6-news a:hover { color: var(--brand); }
.f6-news p { font-size: 12.5px; color: var(--mut); line-height: 1.75; margin-top: 4px; }
.f6-news em { font-style: normal; display: block; font-size: 11.5px; color: #a1a1aa; margin-top: 5px; }
.f6-news-lg a { font-size: 16px; }
.f6-more { display: flex; gap: 14px; padding: 2px 16px 14px; font-size: 12.5px; }
.f6-more a { color: var(--brand); }

.f6-hot { list-style: none; padding: 8px 16px 14px; }
.f6-hot li { display: flex; align-items: baseline; gap: 9px; padding: 8px 0; border-bottom: 1px dashed var(--line); }
.f6-hot li:last-child { border-bottom: 0; }
.f6-hot li > span { flex: none; width: 18px; height: 18px; border-radius: 3px; background: var(--bg); color: #9ca3af; font-size: 11px; font-weight: 700; display: inline-flex; align-items: center; justify-content: center; }
.f6-hot li > span.on { background: var(--brand); color: #fff; }
.f6-hot a { font-size: 13.5px; color: var(--txt); line-height: 1.5; }
.f6-hot a:hover { color: var(--brand); }

.f6-tags { padding: 12px 16px 16px; }
.f6-tags a { display: inline-block; font-size: 12.5px; padding: 4px 11px; margin: 0 7px 7px 0; border-radius: var(--radius-s); background: var(--bg); color: var(--mut); border: 1px solid var(--line); }
.f6-tags a:hover { border-color: var(--brand); color: var(--brand); background: var(--brand-l); }
.f6-sites { display: flex; flex-wrap: wrap; gap: 4px 18px; padding: 12px 16px 16px; }
.f6-sites a { font-size: 13.5px; color: var(--txt); padding: 3px 0; }
.f6-sites a:hover { color: var(--brand); }
.f6-sites-lg a { font-size: 14px; width: calc(33.33% - 18px); }

.f6-pager { display: flex; gap: 7px; justify-content: center; padding: 6px 0 16px; flex-wrap: wrap; }
.f6-pager a, .f6-pager span.on { min-width: 33px; text-align: center; padding: 6px 10px; font-size: 13px; border: 1px solid var(--line); border-radius: var(--radius-s); color: var(--txt); }
.f6-pager a:hover { border-color: var(--brand); color: var(--brand); }
.f6-pager span.on { background: var(--brand); border-color: var(--brand); color: #fff; }

.f6-article { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 30px 24px; }
.f6-article h1 { font-size: 27px; line-height: 1.45; letter-spacing: .5px; }
.f6-art-meta { font-size: 12px; color: #9ca3af; margin: 12px 0 20px; padding-bottom: 14px; border-bottom: 1px solid var(--line); }
.f6-art-body p { font-size: 15.5px; line-height: 1.95; color: #374151; margin: 12px 0; }
.f6-art-body h2 { font-size: 19px; margin: 24px 0 10px; padding-left: 10px; border-left: 4px solid var(--brand); }
.f6-art-body h3 { font-size: 16.5px; margin: 18px 0 8px; }
.f6-art-tags { border-top: 1px dashed var(--line); margin-top: 16px; padding: 14px 0 0; }
.f6-art-cover { margin-bottom: 18px; }
.f6-art-cover img { width: 100%; display: block; border-radius: var(--radius-s); }
.f6-art-note { font-size: 13px; color: var(--mut); line-height: 1.9; margin: 8px 0; }

.f6-pn { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 14px; }
.f6-pn a { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-s); padding: 11px 14px; display: flex; flex-direction: column; gap: 4px; }
.f6-pn a:hover { border-color: var(--brand); }
.f6-pn span { font-size: 11px; color: var(--mut); }
.f6-pn b { font-size: 13px; font-weight: 500; color: var(--txt); line-height: 1.5; }
.f6-pn-n { text-align: right; }
.f6-rel { list-style: none; padding: 6px 16px 14px; }
.f6-rel li { padding: 7px 0; border-bottom: 1px dashed var(--line); font-size: 13.5px; }
.f6-rel li:last-child { border-bottom: 0; }
.f6-rel a { color: var(--txt); }
.f6-rel a:hover { color: var(--brand); }

.f6-ft { margin-top: 26px; padding: 18px 2px 26px; border-top: 1px solid var(--line); }
.f6-ft-links { font-size: 11.5px; color: #a1a1aa; line-height: 2.1; }
.f6-ft-links span { margin-right: 10px; color: #9ca3af; }
.f6-ft-links a { color: #a1a1aa; margin-right: 12px; }
.f6-ft-links a:hover { color: var(--brand); }
.f6-ft-cp { font-size: 11.5px; color: #b6bfca; margin-top: 8px; }

@media (max-width: 900px) {
  .f6-shell { flex-direction: column; }
  .f6-side { width: 100%; position: static; max-height: none; border-right: 0; border-bottom: 1px solid var(--line); padding: 14px 16px; }
  .f6-logo { flex-direction: row; align-items: center; gap: 10px; padding-bottom: 12px; margin-bottom: 10px; }
  .f6-logo-s { width: 30px; height: 30px; font-size: 15px; margin-bottom: 0; }
  .f6-logo i { display: none; }
  .f6-menu { flex-direction: row; overflow-x: auto; gap: 6px; padding-bottom: 4px; }
  .f6-menu a { white-space: nowrap; padding: 7px 12px; }
  .f6-side-box, .f6-side-cp { display: none; }
  .f6-body { padding: 16px 16px 0; }
  .f6-board { grid-template-columns: 1fr; }
  .f6-head h1 { font-size: 22px; }
  .f6-article { padding: 18px 16px 16px; }
  .f6-article h1 { font-size: 22px; }
  .f6-pn { grid-template-columns: 1fr; }
  .f6-sites-lg a { width: calc(50% - 18px); }
}