/* ==========================================================================
   玩车网 · 前台样式 v2
   编辑部式新闻排版 / 品牌橙 #ff6a00（取自官方 Logo）/ 1200px 栅格
   --------------------------------------------------------------------------
   改造要点：
   1. 频道纵深网格改用 minmax(0,1fr)，并给所有 flex/grid 子项补 min-width:0，
      彻底消除横向溢出（原 4 列被内容撑到 492px/列，整页超出 968px）
   2. 主导航去掉 overflow-x:auto（它把 overflow-y 一并变成 auto，裁掉了下拉面板）
   3. 内页统一 4/8/12/16/20/24/32/40/56 间距节奏，频道页去掉重复的 .wrap
   ========================================================================== */

:root{
  /* 品牌色：与 upload/logo 中的 #ff6600 对齐 */
  --brand:#ff6a00;
  --brand-dark:#e05600;
  --brand-ink:#c04a00;          /* 正文内链接用，白底对比度 4.7:1 */
  --brand-soft:#fff3ea;
  /* 中性色 */
  --ink:#0f1724;
  --ink-2:#2a3444;
  --muted:#6e7a8d;
  --faint:#9aa4b4;
  --line:#e6e9ef;
  --line-2:#eef1f6;
  --bg:#f4f6f9;
  --card:#fff;
  --soft:#f7f9fc;
  --radius-lg:20px;
  --navy:#0d1626;
  /* 形态 */
  --radius:14px;
  --radius-s:10px;
  /* 间距节奏（8pt 基准） */
  --s1:4px; --s2:8px; --s3:12px; --s4:16px; --s5:20px;
  --s6:24px; --s7:32px; --s8:40px; --s9:56px;
  /* 阴影层级 */
  --shadow:0 1px 2px rgba(15,23,36,.04),0 4px 16px rgba(15,23,36,.05);
  --shadow-hover:0 14px 34px rgba(15,23,36,.13);
  --font:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",Arial,sans-serif;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font:15px/1.7 var(--font);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none;transition:color .18s}
a:hover{color:var(--brand-ink)}
img{max-width:100%;display:block;border:0}
h1,h2,h3,h4,p,ul,ol,figure{margin:0}
ul,ol{list-style:none;padding:0}
button,input,select,textarea{font-family:inherit;font-size:inherit;outline:none}
time{font-variant-numeric:tabular-nums}
.wrap{width:min(1200px,calc(100% - 40px));margin:0 auto}
.site-main{min-height:60vh;padding-bottom:var(--s9)}

/* ---------- 顶部通栏 ---------- */
.topbar{background:var(--navy);color:#a9b5c8;font-size:12px;line-height:34px}
.topbar-inner{display:flex;align-items:center;gap:20px}
.topbar-date{color:#8e9cb3;font-variant-numeric:tabular-nums}
.topbar-slogan{color:#6f7f99;padding-left:20px;border-left:1px solid #24314a}
.topbar-right{margin-left:auto;display:flex;gap:18px}
.topbar-right a{color:#cbd4e2}
.topbar-right a:hover{color:#fff}

/* ---------- 站头 ---------- */
.site-header{background:var(--card);border-bottom:1px solid var(--line);position:relative;z-index:20}
.masthead{display:flex;align-items:center;gap:var(--s6);height:88px}
.brand{display:flex;align-items:center;gap:14px;flex-shrink:0;min-width:0}
.brand:hover{color:inherit}
.brand-mark{display:flex;align-items:center;justify-content:center;flex-shrink:0}
.brand-logo{height:46px;width:auto;max-width:none;object-fit:contain}
.brand-divider{width:1px;height:28px;background:var(--line);flex-shrink:0}
.brand-tag{font-size:12px;line-height:1.45;letter-spacing:1px;color:var(--muted);white-space:nowrap}
.brand-text{display:flex;flex-direction:column;line-height:1.15;min-width:0}
.brand-text strong{font-size:25px;letter-spacing:2px;font-weight:800;color:var(--ink)}
.brand-text small{font-size:11px;letter-spacing:3px;color:var(--muted);margin-top:4px}

.search{margin-left:auto;display:flex;align-items:center;width:340px;max-width:38vw;height:42px;border:1px solid var(--line);border-radius:24px;background:var(--soft);position:relative;overflow:visible;transition:border-color .2s,box-shadow .2s,background .2s}
.search:focus-within{border-color:var(--brand);box-shadow:0 0 0 3px rgba(255,106,0,.12);background:var(--card)}
.search input{flex:1;min-width:0;border:0;background:transparent;padding:0 8px 0 18px;color:var(--ink);font-size:13px}
.search input::placeholder{color:var(--faint)}
.search button{width:48px;height:100%;border:0;background:transparent;color:var(--muted);cursor:pointer;display:grid;place-items:center}
.search button:hover{color:var(--brand-ink)}
.masthead-extra{flex-shrink:0}
.btn-ghost{display:inline-block;padding:9px 18px;border:1px solid var(--brand);color:var(--brand-ink);border-radius:22px;font-size:13px;font-weight:600;transition:.18s}
.btn-ghost:hover{background:var(--brand);color:#fff}

/* ---------- 主导航（下拉不再被裁切） ---------- */
.mainnav{
  position:sticky;top:0;z-index:40;
  background:var(--card);border-top:1px solid var(--line-2);
  transition:box-shadow .25s;
}
.mainnav.is-stuck{box-shadow:0 6px 20px rgba(15,23,36,.08)}
.mainnav-inner{display:flex;align-items:stretch;gap:2px;height:52px;overflow:visible}
.mainnav-inner>a,
.nav-item>a{
  position:relative;display:flex;align-items:center;gap:6px;
  padding:0 18px;height:52px;
  font-size:15px;font-weight:600;color:var(--ink-2);
  white-space:nowrap;flex-shrink:0;
}
.mainnav-inner>a:first-child{padding-left:2px}
.mainnav-inner>a:hover,.nav-item>a:hover,
.mainnav-inner>a.is-active,.nav-item>a.is-active{color:var(--brand-ink)}
.mainnav-inner>a.is-active::after,
.nav-item>a.is-active::after{
  content:"";position:absolute;left:18px;right:18px;bottom:0;height:3px;
  background:var(--brand);border-radius:3px 3px 0 0;
}
.mainnav-inner>a:first-child.is-active::after{left:2px;right:18px}
.nav-item{position:relative;display:flex;align-items:stretch;flex-shrink:0}
.nav-caret{font-style:normal;font-size:9px;opacity:.5;line-height:1;transition:transform .2s}
.nav-item:hover .nav-caret{transform:rotate(180deg);opacity:1}

.nav-dropdown{
  position:absolute;left:0;top:100%;min-width:172px;
  background:var(--card);border:1px solid var(--line);border-top:2px solid var(--brand);
  border-radius:0 0 12px 12px;
  box-shadow:0 18px 38px rgba(15,23,36,.16);
  padding:6px 0;
  opacity:0;visibility:hidden;transform:translateY(-6px);
  transition:opacity .18s,transform .18s,visibility .18s;
  z-index:60;
}
.nav-item:hover .nav-dropdown,
.nav-item:focus-within .nav-dropdown{opacity:1;visibility:visible;transform:translateY(0)}
.nav-dropdown a{
  display:block;height:auto;line-height:1.5;padding:9px 18px;
  font-size:13.5px;font-weight:500;color:var(--ink-2);white-space:nowrap;
}
.nav-dropdown a:hover{background:var(--brand-soft);color:var(--brand-ink)}
.nav-dropdown a.is-active{color:var(--brand-ink);background:var(--brand-soft);font-weight:700}
.nav-dropdown .dd-all{border-bottom:1px solid var(--line-2);margin-bottom:5px;font-weight:700;color:var(--ink)}
.nav-toggle{display:none;width:40px;height:40px;border:0;background:transparent;padding:9px;cursor:pointer;flex-direction:column;justify-content:center;gap:5px}
.nav-toggle span{display:block;height:2px;background:var(--ink);border-radius:2px;transition:.25s}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- 今日热点条 ---------- */
.breaking{display:flex;align-items:center;gap:18px;margin-top:var(--s5);padding:0 18px;height:52px;background:var(--card);border:1px solid var(--line);border-left:3px solid var(--brand);border-radius:var(--radius-s);box-shadow:var(--shadow)}
.breaking-label{display:flex;align-items:center;gap:8px;font-size:13px;font-weight:800;color:var(--brand-ink);white-space:nowrap;flex-shrink:0}
.breaking-label i{width:7px;height:7px;border-radius:50%;background:var(--brand);box-shadow:0 0 0 4px rgba(255,106,0,.16);animation:pulse 2.4s infinite}
@keyframes pulse{50%{box-shadow:0 0 0 8px rgba(255,106,0,0)}}
.breaking-list{display:flex;gap:26px;overflow:hidden;flex:1;min-width:0;white-space:nowrap;-webkit-mask-image:linear-gradient(90deg,#000 92%,transparent);mask-image:linear-gradient(90deg,#000 92%,transparent)}
.breaking-list a{font-size:13px;color:var(--ink-2);overflow:hidden;text-overflow:ellipsis;max-width:230px;min-width:0}
.breaking-list a.is-first{font-weight:700;color:var(--ink)}
.breaking-more{font-size:12px;color:var(--muted);flex-shrink:0}

/* ---------- 首屏 ---------- */
.hero{display:grid;grid-template-columns:minmax(0,1fr) 380px;gap:var(--s5);margin-top:var(--s5)}
.hero-main{position:relative;min-height:432px;align-self:stretch;min-width:0;border-radius:var(--radius);overflow:hidden;background:#1a2233}
.hero-cover{position:absolute;inset:0;display:block;height:100%;border-radius:var(--radius);overflow:hidden;background:#1a2233;opacity:0;pointer-events:none;transition:opacity .6s ease;z-index:1}
.hero-cover.is-active{opacity:1;pointer-events:auto;z-index:2}
.hero-media{position:absolute;inset:0}
.hero-cover:hover .hero-media img{transform:scale(1.04)}
.hero-overlay{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:flex-end;padding:34px;background:linear-gradient(180deg,rgba(6,12,24,0) 18%,rgba(6,12,24,.42) 48%,rgba(6,12,24,.86) 74%,rgba(6,12,24,.97) 100%);color:#fff}
.hero-badge{align-self:flex-start;background:var(--brand);padding:5px 13px;border-radius:4px;font-size:12px;font-weight:700;letter-spacing:.6px;margin-bottom:14px}
.hero-overlay h1{font-size:32px;line-height:1.36;font-weight:800;letter-spacing:.2px;max-width:94%;text-wrap:pretty}
.hero-overlay p{font-size:13.5px;line-height:1.75;color:rgba(255,255,255,.8);margin-top:10px;max-width:86%;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.hero-time{font-size:12px;color:rgba(255,255,255,.62);margin-top:16px}
.hero-cover:hover h1{color:#fff}
.hero-dots{position:absolute;bottom:16px;right:26px;display:flex;gap:6px;z-index:5}
.hero-dots i{width:6px;height:6px;border-radius:50%;background:rgba(255,255,255,.42);cursor:pointer;transition:.25s}
.hero-dots i.on{background:var(--brand);width:18px;border-radius:3px}

.hero-side{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:var(--s5) var(--s6);box-shadow:var(--shadow);display:flex;flex-direction:column;min-width:0}
.side-head{display:flex;align-items:baseline;justify-content:space-between;padding-bottom:14px;border-bottom:2px solid var(--ink)}
.side-head h2{font-size:18px;font-weight:800;letter-spacing:.5px}
.side-head a{font-size:12px;color:var(--muted)}
.headline-list{flex:1;display:flex;flex-direction:column;justify-content:space-around;padding-top:6px}
.headline-list li{display:flex;gap:14px;padding:11px 0;border-bottom:1px dashed var(--line);min-width:0}
.headline-list li:last-child{border-bottom:0}
.hl-no{font-size:20px;font-weight:800;color:var(--line);font-variant-numeric:tabular-nums;line-height:1.3;min-width:30px;flex-shrink:0}
.headline-list li:first-child .hl-no{color:var(--brand)}
.headline-list li>div{min-width:0}
.headline-list li a{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;font-size:14.5px;font-weight:600;line-height:1.55}
.hl-meta{display:block;font-size:11.5px;color:var(--faint);margin-top:5px}

/* ---------- 区块通用 ---------- */
.section{margin-top:var(--s9)}
.section-picks{padding:var(--s8) 0 46px;background:var(--card);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{display:flex;align-items:baseline;gap:14px;margin-bottom:var(--s6)}
.section-head h2{font-size:22px;font-weight:800;letter-spacing:.5px;display:flex;align-items:center;gap:11px}
.head-bar{width:4px;height:20px;border-radius:2px;background:var(--brand);display:inline-block}
.section-head p{font-size:13px;color:var(--muted)}
.head-more{margin-left:auto;font-size:13px;color:var(--muted);white-space:nowrap;flex-shrink:0}
.head-more:hover{color:var(--brand-ink)}
.section-head.compact{margin-bottom:var(--s4)}

.card-grid{display:grid;gap:var(--s5)}
.card-grid.four{grid-template-columns:repeat(4,minmax(0,1fr))}
.card-grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:transform .25s,box-shadow .25s,border-color .25s;display:flex;flex-direction:column;min-width:0}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);border-color:transparent}
.card-media-link{display:block}
.card-media{height:164px}
.card:hover .card-media img{transform:scale(1.05)}
.card-body{padding:var(--s4) var(--s4) 17px;display:flex;flex-direction:column;flex:1;min-width:0}
.card-title{font-size:15.5px;font-weight:700;line-height:1.55;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:48px;text-wrap:pretty}
.card-excerpt{font-size:12.5px;color:var(--muted);line-height:1.7;margin-top:9px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-meta{display:flex;align-items:center;gap:10px;margin-top:auto;padding-top:14px;font-size:11.5px;color:var(--faint);min-width:0}
.card-meta .views{margin-left:auto;white-space:nowrap}
.chan-tag{color:var(--brand-ink);font-size:11.5px;font-weight:700;background:var(--brand-soft);padding:2px 8px;border-radius:4px;white-space:nowrap}
.chan-tag.lg{font-size:12px;padding:4px 11px}

/* ---------- 频道纵深（溢出修复核心） ---------- */
.channel-blocks{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:var(--s5);align-items:start}
.ch-block{
  min-width:0;
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:var(--s5);box-shadow:var(--shadow);
  display:flex;flex-direction:column;
  transition:box-shadow .25s,border-color .25s;
}
.ch-block:hover{box-shadow:var(--shadow-hover);border-color:transparent}
.ch-head{display:flex;align-items:flex-start;justify-content:space-between;gap:10px;padding-bottom:11px;border-bottom:2px solid var(--ink);margin-bottom:14px;min-width:0}
.ch-title{min-width:0}
.ch-title h3{font-size:17px;font-weight:800;line-height:1.25;min-width:0}
.ch-title h3 a{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:block}
.ch-title small{display:block;font-size:9.5px;color:var(--faint);letter-spacing:1.4px;font-weight:700;margin-top:3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;text-transform:uppercase}
.ch-more{font-size:12px;color:var(--muted);white-space:nowrap;flex-shrink:0;margin-top:4px}
.ch-more:hover{color:var(--brand-ink)}
.ch-lead{display:block;margin-bottom:12px;min-width:0}
.ch-lead-media{height:148px;border-radius:var(--radius-s)}
.ch-lead:hover .ch-lead-media img{transform:scale(1.05)}
.ch-lead-txt{padding-top:10px;min-width:0}
.ch-lead-txt h4{font-size:14.5px;font-weight:700;line-height:1.55;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;text-wrap:pretty}
.ch-lead-txt span{font-size:11.5px;color:var(--faint);display:block;margin-top:6px}
.ch-list{min-width:0}
.ch-list li{display:flex;align-items:center;gap:10px;padding:9px 0;border-top:1px dashed var(--line);font-size:13px;min-width:0}
.ch-list li a{
  flex:1;min-width:0;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}
.ch-list li a::before{content:"·";color:var(--brand);font-weight:900;margin-right:7px}
.ch-list li time{font-size:11px;color:var(--faint);flex-shrink:0;white-space:nowrap}

/* ---------- 最新 / 列表布局 ---------- */
.latest-layout,.list-layout,.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:var(--s6);align-items:start}
.latest-layout,.list-layout{margin-top:var(--s5)}
.latest-main,.list-main{min-width:0}
.news-list{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.news-row{display:flex;gap:18px;padding:var(--s5);border-bottom:1px solid var(--line-2);min-width:0}
.news-row:last-child{border-bottom:0}
.news-row:hover{background:#fcfdfe}
.row-thumb{flex-shrink:0;width:192px;height:130px;border-radius:var(--radius-s);overflow:hidden}
.row-media{height:100%}
.news-row:hover .row-media img{transform:scale(1.05)}
.row-body{min-width:0;display:flex;flex-direction:column;flex:1}
.row-kicker{display:flex;align-items:center;gap:12px;font-size:11.5px;color:var(--faint);min-width:0}
.row-kicker time{margin-left:2px;white-space:nowrap}
.row-body h3{font-size:17px;font-weight:700;line-height:1.5;margin-top:9px}
.row-body h3 a{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;text-wrap:pretty}
.row-body p{font-size:13px;color:var(--muted);line-height:1.7;margin-top:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.row-foot{display:flex;gap:16px;margin-top:auto;padding-top:10px;font-size:11.5px;color:var(--faint)}
.more-btn{display:flex;align-items:center;justify-content:center;gap:8px;margin-top:var(--s5);height:48px;border:1px solid var(--line);border-radius:var(--radius-s);background:var(--card);font-size:14px;font-weight:600;color:var(--ink-2);transition:.18s}
.more-btn:hover{border-color:var(--brand);color:var(--brand-ink)}
.more-btn span{font-size:17px}

/* ---------- 侧栏 ---------- */
.sidebar{display:flex;flex-direction:column;gap:18px;min-width:0}
.side-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:var(--s5);box-shadow:var(--shadow);min-width:0}
.side-card.sticky{position:sticky;top:68px}
.side-card-head{display:flex;align-items:center;justify-content:space-between;padding-bottom:12px;border-bottom:2px solid var(--ink);margin-bottom:6px}
.side-card-head h3{font-size:16px;font-weight:800}
.side-card-head span{font-size:10px;font-weight:800;letter-spacing:1px;color:var(--brand)}
.rank-list li{display:flex;align-items:flex-start;gap:11px;padding:11px 0;border-bottom:1px dashed var(--line-2);font-size:13px;line-height:1.55;min-width:0}
.rank-list li:last-child{border-bottom:0}
.rank-no{flex-shrink:0;width:20px;height:20px;border-radius:5px;background:#f0f2f6;color:var(--muted);font-size:11px;font-weight:800;text-align:center;line-height:20px;margin-top:1px;font-variant-numeric:tabular-nums}
.rank-no.top{background:var(--brand);color:#fff}
.rank-list li a{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;flex:1;min-width:0}
.rank-list li small{color:var(--faint);font-size:11px;flex-shrink:0;font-variant-numeric:tabular-nums}
.chan-chips{display:flex;flex-wrap:wrap;gap:8px;padding-top:12px}
.chan-chips a{padding:6px 13px;border:1px solid var(--line);border-radius:16px;font-size:12.5px;color:var(--ink-2);background:#fafbfc;transition:.18s}
.chan-chips a:hover{border-color:var(--brand);color:var(--brand-ink);background:var(--brand-soft)}
.side-promo{background:linear-gradient(145deg,#131f34,#243a5c);color:#fff;border:0}
.side-promo>span{font-size:11px;letter-spacing:2px;color:#8fa6cc}
.side-promo h3{font-size:19px;font-weight:800;margin-top:10px;line-height:1.4}
.side-promo p{font-size:12.5px;color:#b7c5dc;margin-top:8px}
.side-promo a{display:inline-block;margin-top:16px;font-size:13px;color:#fff;border-bottom:1px solid rgba(255,255,255,.5);padding-bottom:2px}
.side-promo a:hover{color:#ffb48a;border-color:#ffb48a}

/* ---------- 分页 ---------- */
.pager{display:flex;align-items:center;justify-content:center;gap:7px;margin-top:var(--s6);flex-wrap:wrap}
.pg-btn,.pg-num{display:inline-flex;align-items:center;justify-content:center;min-width:38px;height:38px;padding:0 13px;border:1px solid var(--line);border-radius:8px;background:var(--card);font-size:13px;color:var(--ink-2);transition:.18s}
a.pg-btn:hover,a.pg-num:hover{border-color:var(--brand);color:var(--brand-ink)}
.pg-num.is-current{background:var(--brand);border-color:var(--brand);color:#fff;font-weight:700}
.pg-dot{color:var(--faint);padding:0 2px}

/* ---------- 内页公共节奏 ---------- */
.breadcrumb{display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--muted);padding:var(--s5) 0 var(--s4);min-width:0;flex-wrap:nowrap;overflow:hidden}
.breadcrumb a{display:inline-flex;align-items:center;gap:5px;flex-shrink:0;color:var(--muted)}
.breadcrumb a:hover{color:var(--brand-ink)}
.breadcrumb .bc-home{flex-shrink:0;color:var(--faint)}
.breadcrumb > i{width:5px;height:5px;border-top:1.5px solid var(--faint);border-right:1.5px solid var(--faint);transform:rotate(45deg);opacity:.8;flex-shrink:0;margin:0 1px;position:relative;top:-1px}
.breadcrumb > b{font-weight:600;color:var(--ink-2);min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.breadcrumb > span{color:var(--muted);flex-shrink:0}

/* ---------- 频道页 ---------- */
.page-banner{position:relative;overflow:hidden;margin-top:var(--s4);padding:34px 36px;background:linear-gradient(118deg,#111d33,#26395b 62%,#2f4770);border-radius:var(--radius);color:#fff}
.page-banner h1{font-size:31px;font-weight:800;letter-spacing:1px;margin-top:8px;display:flex;align-items:baseline;gap:14px;flex-wrap:wrap}
.page-banner h1 small{font-size:13px;font-weight:500;color:#a9bddb;letter-spacing:0}
.page-banner p{font-size:13.5px;line-height:1.8;color:#b9c8df;margin-top:10px;max-width:70%}
.banner-en{font-size:11px;letter-spacing:3px;color:#8ba4cc}
.banner-deco{position:absolute;right:14px;top:-16px;opacity:.07;pointer-events:none;user-select:none;line-height:.82}
.banner-deco span{font-size:112px;font-weight:900;letter-spacing:-5px;white-space:nowrap}

.filter-chips{display:flex;gap:9px;flex-wrap:wrap;margin-top:var(--s5)}
.filter-chips a{padding:8px 18px;border-radius:22px;background:var(--card);border:1px solid var(--line);font-size:13px;color:var(--ink-2);transition:.18s}
.filter-chips a.is-active,.filter-chips a:hover{background:var(--brand);border-color:var(--brand);color:#fff}
.sub-chips{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:var(--s3);padding:12px 16px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius-s)}
.sub-label{font-size:12px;font-weight:700;color:var(--muted);margin-right:6px}
.sub-chips a{padding:6px 14px;border-radius:15px;font-size:12.5px;color:var(--ink-2);background:#f5f7fa;transition:.18s}
.sub-chips a:hover{background:var(--brand-soft);color:var(--brand-ink)}
.sub-chips a.is-active{background:var(--brand);color:#fff}
.list-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:var(--s4);min-width:0}
.list-head h2{font-size:20px;font-weight:800}
.list-head span{font-size:12px;color:var(--faint);white-space:nowrap;flex-shrink:0}
.empty-state{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:68px 20px;text-align:center}
.empty-state h3{font-size:18px}
.empty-state p{color:var(--muted);margin-top:8px;font-size:13px}
.empty-state a{color:var(--brand-ink)}

/* ---------- 文章详情 ---------- */
.article-main{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:40px 48px 44px;min-width:0}
.article-kicker{display:flex;align-items:center;gap:9px;margin-bottom:16px}
.flag{font-size:11px;padding:3px 9px;border-radius:4px;font-weight:700}
.flag.hot{background:var(--card)0e6;color:#c2560c}
.flag.top{background:var(--brand-soft);color:var(--brand-ink)}
.article-head h1{font-size:32px;line-height:1.42;font-weight:800;letter-spacing:.2px;text-wrap:pretty}
.article-subtitle{font-size:15px;color:var(--muted);margin-top:10px;text-wrap:pretty}
.article-meta{display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin-top:var(--s5);padding-bottom:var(--s5);border-bottom:1px solid var(--line);font-size:12.5px;color:var(--faint)}
.meta-source{color:var(--brand-ink);font-weight:700}
.meta-origin{display:inline-block;padding:2px 8px;border:1px solid var(--line);border-radius:20px;font-size:11.5px;color:var(--ink-2);text-decoration:none;transition:border-color .18s,color .18s}
.meta-origin:hover{border-color:var(--accent);color:var(--accent)}
.article-lead{margin-top:var(--s6);padding:17px 21px;background:var(--soft);border-left:3px solid var(--brand);border-radius:0 var(--radius-s) var(--radius-s) 0;font-size:14.5px;line-height:1.9;color:var(--ink-2);text-wrap:pretty}
.article-cover{margin:var(--s6) 0;border-radius:var(--radius-s);overflow:hidden;background:var(--line-2)}
.article-cover img{width:100%;max-height:520px;object-fit:cover;margin:0 auto}
.article-body{font-size:16.5px;line-height:2.05;color:var(--ink-2);margin-top:var(--s6);overflow-wrap:break-word;word-break:break-word}
.article-body p{margin:0 0 1.15em}
.article-body img{height:auto;max-width:100%;margin:18px auto;border-radius:8px}
.article-body h2,.article-body h3,.article-body h4{font-size:20px;font-weight:800;margin:1.6em 0 .7em;color:var(--ink);line-height:1.5}
.article-body blockquote{margin:1.4em 0;padding:13px 20px;background:var(--soft);border-left:3px solid var(--brand);color:var(--ink-2)}
.article-body table{max-width:100%;border-collapse:collapse;margin:1.2em 0}
.article-body td,.article-body th{border:1px solid var(--line);padding:8px 12px}
.article-body a{color:var(--brand-ink);text-decoration:underline;text-underline-offset:2px}
.article-tags{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-top:var(--s7);padding-top:var(--s5);border-top:1px solid var(--line)}
.article-tags>span{font-size:12.5px;color:var(--muted);margin-right:4px}
.article-tags a{padding:6px 13px;background:#f5f7fa;border-radius:15px;font-size:12.5px;color:var(--ink-2)}
.article-tags a:hover{background:var(--brand-soft);color:var(--brand-ink)}
.article-actions{display:flex;gap:10px;margin-top:var(--s5)}
.act-btn{padding:9px 18px;border:1px solid var(--line);border-radius:22px;font-size:13px;color:var(--ink-2);transition:.18s}
.act-btn:hover{border-color:var(--brand);color:var(--brand-ink)}
.article-nav{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:var(--s7);padding-top:var(--s6);border-top:1px solid var(--line)}
.an-item{display:flex;flex-direction:column;gap:6px;padding:15px 17px;background:var(--soft);border-radius:var(--radius-s);min-width:0;transition:.18s}
.an-item:hover{background:var(--brand-soft)}
.an-item.align-right{text-align:right}
.an-item small{font-size:11.5px;color:var(--faint)}
.an-item span{font-size:14px;font-weight:600;line-height:1.55;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.related{margin-top:var(--s9)}

/* ---------- 搜索 / 404 ---------- */
.search-hero{padding:var(--s8) 0 6px}
.search-hero h1{font-size:26px;font-weight:800}
.big-search{display:flex;gap:10px;margin-top:18px;max-width:640px}
.big-search input{flex:1;min-width:0;height:50px;padding:0 18px;border:1px solid var(--line);border-radius:var(--radius-s);background:var(--card);font-size:15px}
.big-search input:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(255,106,0,.12)}
.big-search button{width:104px;flex-shrink:0;border:0;border-radius:var(--radius-s);background:var(--brand);color:#fff;font-weight:700;cursor:pointer}
.big-search button:hover{background:var(--brand-dark)}
.search-stat{font-size:13.5px;color:var(--muted);margin-top:14px}
.search-stat strong{color:var(--brand-ink)}
.page-404{text-align:center;padding:90px 20px}
.code-404{font-size:110px;font-weight:900;color:var(--line);line-height:1;letter-spacing:-6px}
.page-404 h1{font-size:26px;margin-top:-10px}
.page-404 p{color:var(--muted);margin-top:10px}
.notfound-actions{display:flex;justify-content:center;gap:12px;margin-top:var(--s6);flex-wrap:wrap}
.btn-primary,.btn-outline{display:inline-block;padding:11px 26px;border-radius:24px;font-size:14px;font-weight:600;transition:.18s}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-dark);color:#fff}
.btn-outline{border:1px solid var(--line);color:var(--ink-2);background:var(--card)}
.btn-outline:hover{border-color:var(--brand);color:var(--brand-ink)}
.chan-chips.wide{justify-content:center;margin-top:var(--s7)}
.chan-chips.wide a{font-size:13px;padding:8px 16px}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--navy);color:#c2ccdb;margin-top:var(--s9)}
.footer-grid{display:grid;grid-template-columns:2.2fr 1fr 1fr 1.4fr;gap:36px;padding:48px 0 40px}
.footer-brand{display:flex;align-items:center;gap:12px;color:#fff;font-size:19px;letter-spacing:1px}
.footer-logo{height:38px;width:auto;max-width:none}
.footer-about p{font-size:13px;line-height:1.9;margin-top:14px;color:#a7b4c8}
.footer-muted{color:#7d8da4!important;font-size:12px!important}
.footer-links h4,.footer-qr h4{color:#fff;font-size:14px;margin-bottom:16px}
.footer-links{display:flex;flex-direction:column;gap:9px}
.footer-links a{font-size:13px;color:#a7b4c8}
.footer-links a:hover{color:#fff}
.footer-qr p{font-size:12.5px;line-height:1.9}
.footer-qr .btn-outline{background:transparent;border-color:#43536e;color:#d5deeb;margin-top:16px;padding:8px 18px;font-size:12.5px}
.footer-qr .btn-outline:hover{border-color:var(--brand);color:#fff}
.footer-bottom{border-top:1px solid #243149;padding:16px 0;font-size:12px;color:#8b9ab0}
.footer-bottom .footer-muted{display:inline;margin-left:12px}

/* ---------- 图片与占位 ---------- */
.media{position:relative;display:block;width:100%;overflow:hidden;background:linear-gradient(135deg,#e9edf3,#dfe5ee)}
.media img{width:100%;height:100%;object-fit:cover;transition:transform .55s cubic-bezier(.2,.7,.3,1)}
.media-ph{position:absolute;inset:0;z-index:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;background:linear-gradient(135deg,#202b40,#374865);color:#fff;padding:12px}
.media-ph i{font-style:normal;font-weight:900;font-size:34px;opacity:.3;letter-spacing:-2px;line-height:1}
.media-ph em{font-style:normal;font-size:12px;letter-spacing:2px;opacity:.72}
.media-ph b{font-weight:600;font-size:12.5px;opacity:.9;max-width:88%;text-align:center;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.ph-tone-0{background:linear-gradient(135deg,#1e2c46,#3a5175)}
.ph-tone-1{background:linear-gradient(135deg,#2b2340,#54406e)}
.ph-tone-2{background:linear-gradient(135deg,#163a3c,#2c6460)}
.ph-tone-3{background:linear-gradient(135deg,#3a2a25,#6b4637)}
.ph-tone-4{background:linear-gradient(135deg,#243247,#465f86)}
.media.is-placeholder img{opacity:.9}
.ph-tag{position:absolute;right:10px;bottom:10px;background:rgba(13,22,38,.72);color:#fff;font-size:10px;padding:2px 7px;border-radius:4px;letter-spacing:.5px;backdrop-filter:blur(4px)}
.media-badge{position:absolute;left:10px;top:10px;background:rgba(13,22,38,.8);color:#fff;font-size:11px;padding:3px 9px;border-radius:4px;letter-spacing:.5px}

/* ---------- 响应式 ---------- */
@media (max-width:1180px){
  .channel-blocks{grid-template-columns:repeat(3,minmax(0,1fr))}
  .hero{grid-template-columns:minmax(0,1fr) 340px}
}
@media (max-width:1024px){
  .mainnav-inner>a,.nav-item>a{padding:0 13px;font-size:14.5px}
  .mainnav-inner>a.is-active::after,.nav-item>a.is-active::after{left:13px;right:13px}
  .latest-layout,.list-layout,.article-layout{grid-template-columns:minmax(0,1fr) 270px;gap:var(--s5)}
  .hero{grid-template-columns:minmax(0,1fr) 310px}
  .hero-main{min-height:396px}
  .hero-overlay h1{font-size:27px}
  .article-main{padding:32px 34px 36px}
  .article-head h1{font-size:28px}
  .card-grid.four{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:2fr 1fr 1fr;gap:28px}
  .footer-qr{grid-column:1 / -1}
}
@media (max-width:900px){
  .masthead{height:74px;gap:14px}
  .brand-logo{height:40px}
  .brand-tag{display:none}
  .brand-text strong{font-size:21px}
  .brand-text small{font-size:10px;letter-spacing:2px}
  .search{flex:1;min-width:0;width:auto;max-width:none}
  .nav-toggle{display:flex;order:-1}
  /* 平板起导航改侧拉抽屉，横排导航隐藏 */
  .mainnav{display:none}
  .channel-blocks{grid-template-columns:repeat(2,minmax(0,1fr))}
  .hero{grid-template-columns:minmax(0,1fr);gap:var(--s4)}
  .hero-main{min-height:360px}
  .hero-side{padding:var(--s4) var(--s5)}
  .headline-list{gap:0}
  .latest-layout,.list-layout,.article-layout{grid-template-columns:minmax(0,1fr)}
  .sidebar{flex-direction:row;flex-wrap:wrap}
  .side-card{flex:1;min-width:260px}
  .side-card.sticky{position:static}
  .news-row{padding:var(--s4)}
  .row-thumb{width:162px;height:112px}
  .article-main{padding:26px 24px 30px}
  .article-head h1{font-size:25px}
  .page-banner{padding:28px 26px}
  .page-banner p{max-width:100%}
}
@media (max-width:640px){
  .wrap{width:calc(100% - 28px)}
  .topbar-slogan{display:none}
  .topbar-inner{gap:10px;font-size:11px}
  .topbar-right{gap:12px}
  .topbar-right a:last-child{display:none}
  /* 手机端头部固定单行，搜索改为按需下拉，避免吸顶收缩时搜索框溢出 */
  .masthead{height:56px;padding:0;flex-wrap:nowrap;gap:8px}
  .site-header.is-scrolled .masthead{height:56px}
  .brand-logo{height:32px}
  .brand-tag,.brand-divider{display:none}
  .masthead-extra{gap:4px}
  .icon-btn,.theme-toggle{width:34px;height:34px}
  .search{position:absolute;left:0;right:0;top:100%;width:auto;max-width:none;height:52px;margin:0;order:0;
    border-radius:0;border-left:0;border-right:0;border-top:1px solid var(--line);
    background:var(--card);padding:0 12px;display:none;box-shadow:0 14px 26px rgba(15,23,36,.14)}
  .site-header.search-open .search{display:flex}
  .search-sug{left:0;right:0;width:auto;top:100%;border-radius:0 0 12px 12px;border-left:0;border-right:0}
  .btn-ghost{display:none}
  .search-toggle{display:grid}
  .breaking{gap:10px;padding:0 12px;height:46px;margin-top:14px}
  .breaking-list{gap:14px;-webkit-mask-image:none;mask-image:none}
  .breaking-list a{max-width:none}
  .breaking-list a:not(.is-first){display:none}
  .breaking-more{display:none}
  .hero{margin-top:var(--s4)}
  .hero-main{min-height:280px}
  .hero-overlay{padding:20px;background:linear-gradient(180deg,rgba(6,12,24,0) 6%,rgba(6,12,24,.46) 32%,rgba(6,12,24,.9) 62%,rgba(6,12,24,.98) 100%)}
  .hero-overlay h1{font-size:20px;line-height:1.35;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;max-width:100%}
  .hero-overlay p{display:none}
  .hero-time{margin-top:10px}
  .section{margin-top:var(--s7)}
  .section-picks{padding:26px 0}
  .section-head{flex-wrap:wrap;gap:8px;margin-bottom:var(--s4)}
  .section-head h2{font-size:19px}
  .section-head p{display:none}
  .head-more{font-size:12px}
  .card-grid.four,.card-grid.three,.channel-blocks{grid-template-columns:minmax(0,1fr);gap:14px}
  .card{flex-direction:row}
  .card-media-link{width:126px;flex-shrink:0}
  .card-media{height:100%;min-height:104px}
  .card-body{padding:12px}
  .card-title{font-size:14px;min-height:0;-webkit-line-clamp:2}
  .card-excerpt{display:none}
  .card-meta{padding-top:8px}
  .ch-lead-media{height:170px}
  .news-row{gap:12px;padding:14px}
  .row-thumb{width:108px;height:84px}
  .row-body h3{font-size:14.5px;margin-top:5px}
  .row-body p{display:none}
  .row-foot{padding-top:6px}
  .sidebar{flex-direction:column}
  .side-card{min-width:0}
  .breadcrumb{padding-top:var(--s3)}
  .page-banner{padding:22px 20px;margin-top:var(--s3)}
  .page-banner h1{font-size:23px}
  .page-banner p{font-size:12.5px}
  .filter-chips{margin-top:var(--s4);gap:7px}
  .filter-chips a{padding:7px 14px;font-size:12px}
  .sub-chips{padding:10px 12px}
  .article-main{padding:20px 16px 24px}
  .article-head h1{font-size:22px;line-height:1.45}
  .article-meta{gap:10px;font-size:11.5px}
  .article-lead{font-size:13.5px;padding:13px 15px}
  .article-body{font-size:15.5px;line-height:1.95}
  .article-nav{grid-template-columns:1fr}
  .an-item.align-right{text-align:left}
  .list-head h2{font-size:17px}
  .big-search button{width:84px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:24px;padding:32px 0}
  .footer-about{grid-column:1 / -1}
  .footer-qr{grid-column:1 / -1}
  .code-404{font-size:80px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}

/* 移动端菜单行分隔（≤900 生效） */
@media (max-width:900px){
  .nav-item{border-bottom:1px solid var(--line-2)}
  .nav-item.is-open{border-bottom-color:transparent}
  .nav-item>a .nav-caret{font-size:11px;opacity:.65;margin-left:auto;padding-right:2px}
  .mainnav-inner>a{border-bottom:1px solid var(--line-2)}
}

/* ---------- 广告位 ---------- */
.ad-slot{position:relative;margin-top:var(--s5);background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:box-shadow .25s,border-color .25s}
.ad-slot:hover{box-shadow:var(--shadow-hover);border-color:transparent}
.ad-slot .ad-media{display:block;line-height:0}
.ad-slot img{width:100%;height:auto;display:block}
.section-ad{margin-top:var(--s6)}
.section-ad .ad-slot{margin-top:0}
.ad-card{position:relative;padding:0!important;overflow:hidden;display:flex;flex-direction:column}
.ad-card .ad-media{display:block;line-height:0}
.ad-card img{width:100%;height:auto;display:block}
.ad-html{overflow:hidden}
.ad-html img{max-width:100%;height:auto}
.ad-label{position:absolute;right:8px;top:8px;z-index:2;font-size:10px;line-height:1.7;letter-spacing:1px;color:#fff;background:rgba(13,22,38,.45);padding:1px 7px;border-radius:4px;pointer-events:none;backdrop-filter:blur(4px)}
.ad-by{display:block;font-size:11px;color:var(--faint);padding:8px 12px;border-top:1px solid var(--line-2);background:#fbfcfd}
@media (max-width:640px){
  .ad-slot{margin-top:var(--s4);border-radius:var(--radius-s)}
  .ad-label{right:6px;top:6px}
}
/* ===== 标签云 / 搜索高亮 / AI 提示（阶段五新增） ===== */
.tag-cloud{display:flex;flex-wrap:wrap;gap:8px}
.tag-cloud a{display:inline-flex;align-items:center;gap:6px;padding:6px 12px;border-radius:999px;background:#f4f5f7;color:var(--ink-2);font-size:13px;line-height:1;text-decoration:none;transition:.18s}
.tag-cloud a:hover{background:var(--brand-soft);color:var(--brand-ink)}
.tag-cloud a i{font-style:normal;font-size:11px;color:#9aa2ae}
.tag-cloud a.on{background:var(--brand);color:#fff}
.tag-cloud a.on i{color:rgba(255,255,255,.8)}
.tag-cloud.lg{gap:10px}
.tag-cloud.lg a{padding:8px 16px;font-size:14px}

.section-tags{padding:var(--s7) 0 var(--s9)}

.tag-banner .banner-deco span{font-size:96px}

.search-filter{display:flex;flex-wrap:wrap;gap:8px;margin:var(--s5) 0 var(--s6)}
.search-filter a{padding:7px 14px;border-radius:999px;background:var(--card);border:1px solid var(--line);color:var(--ink-2);font-size:13px;text-decoration:none}
.search-filter a:hover{border-color:var(--brand);color:var(--brand-ink)}
.search-filter a.on{background:var(--brand);border-color:var(--brand);color:#fff}
.search-mode{color:#9aa2ae;font-size:12px}

.hl{font-style:normal;background:var(--card)3ea;color:var(--brand-ink);padding:0 2px;border-radius:3px}

.ai-notice{margin:0 0 var(--s5);padding:12px 16px;border-left:3px solid var(--brand);background:var(--brand-soft);color:#8a4a12;font-size:13px;line-height:1.7;border-radius:0 8px 8px 0}
.flag.ai{background:#eef2ff;color:#4338ca}

@media(max-width:640px){
  .tag-banner .banner-deco{display:none}
  .tag-cloud.lg a{padding:7px 13px;font-size:13px}
}

.arch-badge{display:inline-block;padding:1px 6px;border-radius:4px;background:#f1f3f5;color:#8b93a1;font-size:11px;line-height:16px}

/* ==========================================================================
   页脚 v3 + 返回顶部（阶段六）
   ========================================================================== */
.site-footer{position:relative;margin-top:0;background:linear-gradient(180deg,#0d1626 0%,#0a111c 100%);color:#b7c3d6;border-top:1px solid rgba(255,255,255,.06)}

.footer-main{display:grid;grid-template-columns:1.9fr .95fr .95fr 1.25fr;gap:44px;padding:52px 0 38px}
.footer-brand{display:inline-flex;align-items:center;gap:12px;color:#fff;font-size:19px;letter-spacing:1px}
.footer-brand strong{font-weight:800}
.footer-logo{height:36px;width:auto;max-width:none;display:block}
.footer-desc{margin-top:16px;font-size:13px;line-height:1.95;color:#93a2b8;max-width:32em}
.footer-sub{margin-top:10px;font-size:12px;line-height:1.8;color:#6d7f96;max-width:34em}
.footer-cta{display:inline-flex;align-items:center;gap:6px;margin-top:18px;padding:8px 16px;border:1px solid rgba(255,255,255,.16);border-radius:999px;font-size:12.5px;color:#e6edf7;transition:.2s}
.footer-cta span{transition:transform .2s}
.footer-cta:hover{border-color:var(--brand);background:rgba(255,106,0,.14);color:#fff}
.footer-cta:hover span{transform:translateX(3px)}

.footer-col h4{color:#fff;font-size:13px;font-weight:700;letter-spacing:.08em;margin-bottom:16px}
.footer-col ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px}
.footer-col ul a{font-size:13px;color:#93a2b8;transition:color .18s}
.footer-col ul a:hover{color:var(--brand)}
.footer-about-col p{font-size:12.5px;line-height:1.9;color:#8d9cb3}
.footer-badges{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.footer-badges span{font-size:11.5px;color:#9fb0c6;border:1px solid rgba(255,255,255,.12);border-radius:6px;padding:3px 9px}

.footer-tagrow{display:flex;align-items:baseline;gap:16px;padding:22px 0 26px;border-top:1px solid rgba(255,255,255,.07)}
.footer-tagrow-label{font-size:12px;color:#7f8fa6;letter-spacing:.1em;flex-shrink:0}
.footer-tagrow-list{display:flex;flex-wrap:wrap;gap:8px}
.footer-tagrow-list a{font-size:12px;color:#a9b8cb;background:rgba(255,255,255,.05);border-radius:6px;padding:4px 10px;transition:.18s}
.footer-tagrow-list a:hover{background:rgba(255,106,0,.16);color:#ffb37a}

.footer-bottom{border-top:1px solid rgba(255,255,255,.07);padding:16px 0}
.footer-bottom-inner{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;font-size:12px;color:#7d8da4}
.footer-copy a{color:#93a2b8}
.footer-copy a:hover{color:#fff}
.footer-note{color:#66768d;line-height:1.7}

/* 返回顶部 */
.to-top{position:fixed;right:24px;bottom:28px;z-index:60;width:44px;height:44px;padding:0;border:0;border-radius:50%;background:var(--card);color:var(--ink);box-shadow:0 8px 24px rgba(15,23,36,.2);display:grid;place-items:center;cursor:pointer;opacity:0;visibility:hidden;transform:translateY(12px);transition:opacity .22s,transform .22s,background .2s,color .2s}
.to-top.is-on{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:var(--brand);color:#fff}
.to-top:active{transform:scale(.94)}
.to-top:focus-visible{outline:2px solid var(--brand);outline-offset:3px}

@media (max-width:1000px){
  .footer-main{grid-template-columns:1.6fr 1fr 1fr;gap:34px;padding:44px 0 32px}
  .footer-about-col{grid-column:1/-1}
}
@media (max-width:700px){
  .site-footer{margin-top:0}
  .footer-main{grid-template-columns:1fr 1fr;gap:26px 20px;padding:34px 0 26px}
  .footer-brand-col,.footer-about-col{grid-column:1/-1}
  .footer-desc{font-size:12.5px}
  .footer-tagrow{flex-direction:column;gap:10px;padding:18px 0 22px}
  .footer-bottom-inner{flex-direction:column;align-items:flex-start;gap:8px}
  .to-top{right:14px;bottom:18px;width:40px;height:40px}
}
@media (prefers-reduced-motion:reduce){
  .to-top{transition:none}
}
/* 页脚文字品牌 / 404 搜索 */
.footer-brand .brand-mark.small{display:inline-flex;align-items:center;justify-content:center;line-height:0}
.footer-brand strong{color:#fff;font-size:19px;font-weight:800;letter-spacing:1px}
.notfound-search{display:flex;gap:10px;max-width:440px;margin:22px auto 0}
.notfound-search input{flex:1;min-width:0;height:44px;border:1px solid var(--line);border-radius:10px;padding:0 14px;font-size:14px;background:var(--card);color:var(--ink)}
.notfound-search input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(255,106,0,.13)}
.notfound-search .btn-primary{height:44px;padding:0 22px;flex-shrink:0}
@media (max-width:560px){.notfound-search{flex-direction:column}.notfound-search .btn-primary{width:100%}}

/* ===== 响应式图片（srcset / WebP）与正文插图 ===== */
.media picture.media-pic{position:relative;z-index:1;display:block;width:100%;height:100%}
.media picture.media-pic img{display:block;width:100%;height:100%;object-fit:cover}
.article-cover picture.media-pic{display:block}
.article-cover picture.media-pic img{display:block;width:100%;height:auto;max-height:520px;object-fit:cover;margin:0 auto}

.article-body figure.body-fig{margin:22px 0}
.article-body figure.body-fig img{margin:0;width:100%;height:auto;border-radius:8px;display:block}
.article-body figcaption{margin-top:9px;font-size:13px;line-height:1.6;color:#7b8698;text-align:center;padding:0 6px}
.article-body figure.body-fig+figure.body-fig{margin-top:16px}

/* 图片加载失败：摘掉 img 后露出底层占位块，不再显示破图或「加载失败」字样 */
.media.img-failed{background:linear-gradient(135deg,#eef1f6,#e3e8f0)}
.media.img-failed::after{content:none}

/* ===== 搜索页：热门搜索词与空状态 ===== */
.hot-searches{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:14px}
.hs-label{font-size:12.5px;color:#8b96a8}
.hot-searches a{display:inline-block;padding:5px 12px;border-radius:20px;background:var(--card);border:1px solid var(--line);font-size:13px;color:var(--ink-2);transition:all .18s}
.hot-searches a:hover{border-color:var(--brand);color:var(--brand);transform:translateY(-1px)}
.empty-block{margin-top:18px}
.empty-label{display:block;font-size:12.5px;color:#8b96a8;margin-bottom:8px}
.empty-state{text-align:center;padding:22px 10px 6px}
.empty-state .tag-cloud,.empty-state .chan-chips{justify-content:center}
@media(max-width:640px){
  .hot-searches{gap:6px}
  .hot-searches a{font-size:12.5px;padding:4px 10px}
}

/* ==========================================================================
   2026 UI 升级：吸顶收缩头部 / 暗色模式 / 微交互
   ========================================================================== */

/* 1. 头部整块吸顶，滚动后收缩 */
.site-header{position:sticky;top:0;z-index:60;background:var(--card);transition:box-shadow .25s ease}
.mainnav{position:relative;top:auto}
.masthead{transition:height .25s ease}
.site-header.is-scrolled{box-shadow:0 10px 30px rgba(15,23,36,.10)}
.site-header.is-scrolled .masthead{height:62px}
.site-header.is-scrolled .brand-logo{height:34px}
.site-header.is-scrolled .brand-divider,
.site-header.is-scrolled .brand-tag{display:none}
.site-header.is-scrolled .search{height:36px;width:280px;max-width:32vw}
.site-header.is-scrolled .btn-ghost{padding:7px 14px;font-size:12px}
.site-header.is-scrolled .mainnav-inner{height:46px}
.site-header.is-scrolled .mainnav-inner>a,
.site-header.is-scrolled .nav-item>a{height:46px;font-size:14px}

/* 2. 深浅色开关 */
.masthead-extra{display:flex;align-items:center;gap:10px}
.theme-toggle{width:38px;height:38px;flex-shrink:0;padding:0;border:1px solid var(--line);border-radius:50%;background:transparent;color:var(--muted);cursor:pointer;display:grid;place-items:center;transition:border-color .18s,color .18s,transform .18s}
.theme-toggle:hover{border-color:var(--brand);color:var(--brand-ink);transform:translateY(-1px)}
.theme-toggle svg{width:17px;height:17px}
.theme-toggle .i-moon{display:none}
[data-theme=dark] .theme-toggle .i-moon{display:block}
[data-theme=dark] .theme-toggle .i-sun{display:none}

/* 3. 图片微交互与圆角 */
.news-row:hover .row-media img,
.ch-lead:hover .ch-lead-media img,
.ch-block:hover .ch-lead-media img{transform:scale(1.05)}
.card:hover .card-title{color:var(--brand-ink)}
.hero-main,.hero-cover,.hero-side{border-radius:var(--radius-lg)}

/* 4. 暗色模式 */
[data-theme="dark"]{
  color-scheme:dark;
  --ink:#e9eef7;--ink-2:#c9d2df;--muted:#93a0b3;--faint:#6d798b;
  --line:#243040;--line-2:#1a2331;--bg:#0a1017;--card:#111926;--soft:#161f2d;--navy:#070c12;
  --brand-soft:#2c1a0e;
  --shadow:0 1px 2px rgba(0,0,0,.5),0 6px 18px rgba(0,0,0,.42);
  --shadow-hover:0 16px 40px rgba(0,0,0,.6);
}
[data-theme="dark"] .topbar{background:#050a10}
[data-theme="dark"] .search{background:#0d151f}
[data-theme="dark"] .search:focus-within{background:#0d151f;box-shadow:0 0 0 3px rgba(255,106,0,.18)}
[data-theme="dark"] .nav-dropdown{background:var(--card);box-shadow:0 20px 44px rgba(0,0,0,.6)}
[data-theme="dark"] .media-ph{filter:saturate(.85) brightness(.92)}
[data-theme="dark"] .article-body img{filter:brightness(.94)}
[data-theme="dark"] .tag-cloud a,
[data-theme="dark"] .chan-chips a,
[data-theme="dark"] .act-btn,
[data-theme="dark"] .article-tags a,
[data-theme="dark"] .more-btn,
[data-theme="dark"] .article-lead,
[data-theme="dark"] .ch-list li:hover,
[data-theme="dark"] .news-row:hover{background:#16202e}
[data-theme="dark"] .hero-overlay{background:linear-gradient(180deg,rgba(0,0,0,0) 24%,rgba(0,0,0,.55) 56%,rgba(0,0,0,.96) 100%)}
[data-theme="dark"] ::selection{background:rgba(255,106,0,.35)}
[data-theme="dark"] .brand-logo{background:#fff;border-radius:10px;padding:3px 9px}

/* ==========================================================================
   阅读体验与便捷功能：进度条 / 联想 / 稍后读 / 目录 / 灯箱 / 移动 tab
   ========================================================================== */

/* 阅读进度条 */
.read-progress{position:fixed;left:0;top:0;height:3px;width:0;background:linear-gradient(90deg,var(--brand),#ff9a3c);z-index:90;pointer-events:none;transition:width .12s linear}

/* 搜索联想 */
.search{position:relative}
.search-sug{position:absolute;left:auto;right:0;top:calc(100% + 8px);width:min(420px,86vw);background:var(--card);border:1px solid var(--line);border-radius:12px;box-shadow:0 20px 44px rgba(15,23,36,.18);padding:6px;z-index:80;max-height:60vh;overflow:auto}
.sug-group{padding:7px 9px 3px;font-size:11px;letter-spacing:1px;color:var(--faint)}
.search-sug a{display:flex;align-items:center;gap:8px;padding:8px 10px;border-radius:8px;font-size:13.5px;color:var(--ink-2);line-height:1.45}
.search-sug a:hover,.search-sug a.is-on{background:var(--brand-soft);color:var(--brand-ink)}
.search-sug a i{font-style:normal;font-size:10.5px;color:var(--faint);margin-left:auto;white-space:nowrap;flex-shrink:0}
.sug-empty{padding:12px 10px;font-size:12.5px;color:var(--muted)}

/* 图标按钮（稍后读） */
.icon-btn{position:relative;width:38px;height:38px;flex-shrink:0;padding:0;border:1px solid var(--line);border-radius:50%;background:transparent;color:var(--muted);cursor:pointer;display:grid;place-items:center;transition:border-color .18s,color .18s,transform .18s}
.icon-btn:hover{border-color:var(--brand);color:var(--brand-ink);transform:translateY(-1px)}
.icon-count{position:absolute;top:-3px;right:-3px;min-width:16px;height:16px;padding:0 4px;border-radius:9px;background:var(--brand);color:#fff;font-size:10px;line-height:16px;text-align:center;font-style:normal}

/* 稍后读面板 */
.later-panel{position:fixed;top:74px;right:max(18px,calc((100vw - 1200px)/2));width:min(360px,calc(100vw - 32px));max-height:70vh;overflow:auto;background:var(--card);border:1px solid var(--line);border-radius:14px;box-shadow:0 26px 64px rgba(15,23,36,.26);z-index:95;padding:8px}
.lp-head{display:flex;align-items:center;justify-content:space-between;padding:8px 10px 10px;border-bottom:1px solid var(--line-2)}
.lp-head b{font-size:14px}
.lp-close{width:26px;height:26px;border:0;border-radius:50%;background:transparent;color:var(--muted);font-size:18px;line-height:1;cursor:pointer}
.lp-close:hover{background:var(--soft);color:var(--ink)}
.lp-item{display:flex;gap:10px;padding:10px;border-radius:10px;align-items:flex-start}
.lp-item:hover{background:var(--soft)}
.lp-item img{width:64px;height:44px;object-fit:cover;border-radius:6px;background:var(--line-2);flex-shrink:0}
.lp-item a{font-size:13px;line-height:1.5;color:var(--ink-2);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.lp-item a:hover{color:var(--brand-ink)}
.lp-item small{display:block;font-size:11px;color:var(--faint);margin-top:4px}
.lp-del{margin-left:auto;border:0;background:transparent;color:var(--faint);cursor:pointer;font-size:15px;line-height:1;padding:2px 4px;flex-shrink:0}
.lp-del:hover{color:var(--brand-ink)}
.lp-empty{padding:18px 12px 20px;font-size:12.5px;line-height:1.7;color:var(--muted);text-align:center}

/* 阅读工具条 */
.read-tools{display:flex;align-items:center;gap:6px;margin-top:18px;flex-wrap:wrap}
.rt-label{font-size:12px;color:var(--faint);margin-right:2px}
.rt-btn{height:30px;padding:0 11px;border:1px solid var(--line);background:var(--card);border-radius:8px;font-size:12.5px;color:var(--ink-2);cursor:pointer;transition:.16s}
.rt-btn:hover{border-color:var(--brand);color:var(--brand-ink)}
.rt-btn.on{border-color:var(--brand);color:var(--brand-ink);background:var(--brand-soft)}
.rt-sep{width:1px;height:16px;background:var(--line);margin:0 4px}
.rt-later{display:inline-flex;align-items:center;gap:6px}
.rt-later[aria-pressed=true]{border-color:var(--brand);color:var(--brand-ink);background:var(--brand-soft)}

/* 正文字号档位（挂在 body 上） */
.read-s .article-body{font-size:15px;line-height:1.95}
.read-m .article-body{font-size:16.5px}
.read-l .article-body{font-size:19px;line-height:2}

/* 文章目录 */
.toc-list{display:flex;flex-direction:column;gap:1px;max-height:44vh;overflow:auto}
.toc-list a{display:block;padding:6px 10px;font-size:13px;line-height:1.5;color:var(--ink-2);border-left:2px solid transparent;border-radius:0 6px 6px 0}
.toc-list a:hover{background:var(--soft);color:var(--brand-ink)}
.toc-list a.on{color:var(--brand-ink);border-left-color:var(--brand);background:var(--brand-soft);font-weight:600}
.toc-list .lv3 a{padding-left:22px;font-size:12.5px;color:var(--muted)}

/* 图片灯箱 */
.lightbox{position:fixed;inset:0;z-index:200;display:grid;place-items:center;padding:3vh 3vw;background:rgba(6,10,18,.93);opacity:0;pointer-events:none;transition:opacity .2s}
.lightbox.on{opacity:1;pointer-events:auto}
.lightbox img{max-width:94vw;max-height:92vh;border-radius:8px;box-shadow:0 30px 80px rgba(0,0,0,.65);cursor:zoom-out}
.lb-close{position:absolute;top:16px;right:20px;width:40px;height:40px;border:0;border-radius:50%;background:rgba(255,255,255,.14);color:#fff;font-size:20px;line-height:1;cursor:pointer}
.lb-close:hover{background:rgba(255,255,255,.26)}
.article-body img{cursor:zoom-in}

/* 移动端底部 tab */
.mobile-tabbar{display:none}
@media (max-width:640px){
  .mobile-tabbar{
    position:fixed;left:0;right:0;bottom:0;z-index:70;display:grid;grid-template-columns:repeat(4,1fr);
    background:var(--card);border-top:1px solid var(--line);
    padding:6px 0 calc(6px + env(safe-area-inset-bottom));
    box-shadow:0 -6px 22px rgba(15,23,36,.08);
  }
  .mobile-tabbar a,.mobile-tabbar button{display:flex;flex-direction:column;align-items:center;gap:3px;font-size:11px;color:var(--muted);background:none;border:0;padding:2px 0;cursor:pointer;text-decoration:none;position:relative}
  .mobile-tabbar svg{width:21px;height:21px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
  .mobile-tabbar a:active,.mobile-tabbar button:active{color:var(--brand-ink)}
  .mobile-tabbar b{position:absolute;top:-2px;right:calc(50% - 20px);min-width:15px;height:15px;border-radius:8px;background:var(--brand);color:#fff;font-size:10px;line-height:15px;font-weight:600;padding:0 3px}
  body{padding-bottom:58px}
  .to-top{bottom:74px}
  .site-header.is-scrolled .search{max-width:100%}
}

/* ---------- hero 图片铺满并将遮罩置顶（修复 .media 覆盖 .hero-media 定位） ---------- */
.hero-cover .hero-media{position:absolute;inset:0;height:100%}
.hero-cover .hero-media picture.media-pic{height:100%}
.hero-cover .hero-overlay{z-index:2}
.hero-cover .hero-media .media-ph b{font-size:15px}
.hero-overlay h1,.hero-overlay p{text-shadow:0 1px 4px rgba(4,8,16,.55)}

/* ---------- 移动端：搜索开关 + 侧拉频道导航 ---------- */
.search-toggle{display:none;width:34px;height:34px;padding:0;border:1px solid var(--line);border-radius:50%;
  background:transparent;color:var(--muted);cursor:pointer;place-items:center;flex-shrink:0}
.search-toggle:hover{border-color:var(--brand);color:var(--brand-ink)}
.site-header.search-open .search-toggle{border-color:var(--brand);color:var(--brand-ink);background:var(--brand-soft)}

html.nd-lock{overflow:hidden}
.nd-mask{position:fixed;inset:0;z-index:98;background:rgba(8,12,20,.52);opacity:0;transition:opacity .26s ease}
.nd-mask.is-in{opacity:1}
.nav-drawer{position:fixed;top:0;left:0;bottom:0;z-index:99;width:min(312px,84vw);
  display:flex;flex-direction:column;background:var(--card);color:var(--ink);
  transform:translateX(-102%);transition:transform .28s cubic-bezier(.2,.7,.3,1);
  box-shadow:10px 0 40px rgba(8,12,20,.3);overflow:hidden}
.nav-drawer[hidden]{display:none}
.nav-drawer.is-in{transform:none}
.nd-head{display:flex;align-items:center;justify-content:space-between;padding:16px 16px 12px;border-bottom:1px solid var(--line-2)}
.nd-head b{font-size:15px;font-weight:800;letter-spacing:.5px}
.nd-close{width:30px;height:30px;border:0;border-radius:50%;background:var(--soft);color:var(--muted);font-size:19px;line-height:1;cursor:pointer}
.nd-close:hover{color:var(--ink)}
.nd-body{flex:1;overflow-y:auto;padding:8px 10px 14px;-webkit-overflow-scrolling:touch}
.nd-link{display:flex;align-items:center;justify-content:space-between;gap:8px;height:44px;padding:0 12px;
  border-radius:10px;font-size:15px;font-weight:600;color:var(--ink-2)}
.nd-link:hover{background:var(--soft);color:var(--ink)}
.nd-link.is-active{color:var(--brand-ink);background:var(--brand-soft)}
.nd-link i{font-style:normal;font-size:11px;font-weight:600;color:var(--faint);background:var(--soft);
  border-radius:9px;padding:1px 7px;min-width:20px;text-align:center}
.nd-link.is-active i{color:var(--brand-ink);background:rgba(255,106,0,.14)}
.nd-sub{display:flex;flex-wrap:wrap;gap:6px;padding:2px 12px 10px}
.nd-sub a{font-size:12.5px;color:var(--muted);border:1px solid var(--line);border-radius:13px;padding:4px 10px;line-height:1.5}
.nd-sub a:hover{border-color:var(--brand);color:var(--brand-ink)}
.nd-sub a.is-active{background:var(--brand);border-color:var(--brand);color:#fff}
.nd-group.is-on>.nd-link{color:var(--brand-ink)}
.nd-foot{padding:12px 14px calc(14px + env(safe-area-inset-bottom));border-top:1px solid var(--line-2);background:var(--soft)}
.nd-cta{display:block;text-align:center;padding:11px;border-radius:10px;background:var(--brand);color:#fff;font-size:14px;font-weight:700}
.nd-cta:hover{color:#fff;filter:brightness(1.05)}
.nd-tip{margin:9px 0 0;font-size:11.5px;line-height:1.6;color:var(--faint);text-align:center}
@media (max-width:640px){
  .search-toggle{display:grid}
}
/* 兜底：手机端搜索条必须absolute铺满（后面的 .search{position:relative} 会盖掉） */
@media (max-width:640px){
  .site-header .search{position:absolute;left:0;right:0;top:100%;width:auto;max-width:none;height:52px;margin:0;
    border-radius:0;border-left:0;border-right:0;border-top:1px solid var(--line);
    background:var(--card);padding:0 12px;display:none;box-shadow:0 14px 26px rgba(15,23,36,.14)}
  .site-header.search-open .search{display:flex}
  .site-header .search-sug{left:0;right:0;width:auto;top:100%;border-radius:0 0 12px 12px;border-left:0;border-right:0}
}

/* 粘性页脚：内容不足一屏时页脚贴底，避免页脚下方露出背景空隙 */
body{min-height:100vh;min-height:100dvh;display:flex;flex-direction:column}
.site-main{flex:1 0 auto}

/* 文末题图（仅正文无图时出现，封面不再顶在正文上方） */
.article-cover-end{margin:var(--s7) 0 var(--s3)}
.article-cover-end figcaption{margin-top:9px;font-size:12px;color:var(--faint);text-align:center}