/* ==========================================================
 * 鼎宇网络 · 内容板块（列表页 / 文章详情页）专用样式
 * 依赖：先引入 style.css（配色变量来自那里的 :root）
 * 设计原则：与首页同一套深色科技风，不新增第三方依赖
 * ========================================================== */

/* ---------- 导航当前项高亮 ---------- */
.nav__links a.is-on { color: #fff; }
.nav__links a.is-on::after { right: 0; background: var(--grad); }

/* ---------- 页头占位（nav 是 sticky，正文起点下移） ---------- */
.art-hero { padding: 108px 0 8px; position: relative; }
.art-hero__grid {
  position: absolute; inset: 0; z-index: -1; opacity: .5;
  background-image: linear-gradient(rgba(124,92,255,.07) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(124,92,255,.07) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(circle at 50% 0%, #000 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(circle at 50% 0%, #000 0%, transparent 70%);
}

/* ---------- 面包屑 ---------- */
.crumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
  font-size: 13px; color: var(--tx-3); margin-bottom: 18px; }
.crumbs a { color: var(--tx-2); transition: color .2s; }
.crumbs a:hover { color: var(--c); }
.crumbs span { opacity: .5; }

/* ---------- 标题区 ---------- */
.art-title { font-size: clamp(26px, 3.4vw, 40px); font-weight: 700; letter-spacing: -.02em; line-height: 1.3; }
.art-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 16px; font-size: 13px; color: var(--tx-3); }
.art-cat {
  display: inline-flex; align-items: center; height: 24px; padding: 0 10px; border-radius: 20px;
  font-size: 12px; font-weight: 600; color: #fff; background: var(--grad);
}
.art-dot { width: 3px; height: 3px; border-radius: 50%; background: var(--tx-3); }

/* ---------- 一句话结论卡 ---------- */
.takeaway {
  margin: 26px 0 30px; padding: 20px 22px; border-radius: var(--r);
  background: linear-gradient(135deg, rgba(124,92,255,.12), rgba(34,211,238,.08));
  border: 1px solid var(--line-2); position: relative; overflow: hidden;
}
.takeaway::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--grad);
}
.takeaway__tag {
  display: inline-block; font-size: 11px; letter-spacing: .16em; text-transform: uppercase;
  color: var(--c); font-weight: 700; margin-bottom: 8px;
}
.takeaway p { color: var(--tx); line-height: 1.85; font-size: 15.5px; }

/* ---------- 目录 ---------- */
.toc {
  margin: 0 0 30px; padding: 18px 20px; border-radius: var(--r);
  background: var(--panel); border: 1px solid var(--line);
}
.toc__hd { font-size: 13px; font-weight: 700; color: var(--tx-2); letter-spacing: .06em; margin-bottom: 10px; }
.toc ol { counter-reset: toc; }
.toc li { counter-increment: toc; margin: 6px 0; font-size: 14.5px; }
.toc li::before { content: counter(toc) ". "; color: var(--c); font-weight: 600; }
.toc a { color: var(--tx-2); border-bottom: 1px solid transparent; }
.toc a:hover { color: var(--tx); border-bottom-color: var(--line-2); }

/* ---------- 正文 ---------- */
.post { font-size: 16.5px; line-height: 1.95; color: #D6DAE8; }
.post h2 {
  margin: 40px 0 14px; font-size: 21px; font-weight: 700; color: #fff;
  padding-left: 14px; position: relative; line-height: 1.5;
}
.post h2::before {
  content: ""; position: absolute; left: 0; top: 6px; bottom: 6px; width: 3px;
  border-radius: 3px; background: var(--grad);
}
.post h3 { margin: 28px 0 10px; font-size: 17.5px; font-weight: 700; color: #fff; }
.post p { margin: 14px 0; }
.post ul, .post ol { margin: 14px 0; padding-left: 4px; }
.post ul li, .post ol li { position: relative; padding-left: 22px; margin: 8px 0; }
.post ul li::before {
  content: ""; position: absolute; left: 6px; top: 13px; width: 6px; height: 6px;
  border-radius: 50%; background: var(--c); opacity: .8;
}
.post ol { counter-reset: pn; }
.post ol li { counter-increment: pn; }
.post ol li::before {
  content: counter(pn); position: absolute; left: 0; top: 5px;
  width: 18px; height: 18px; border-radius: 50%; font-size: 11px; line-height: 18px; text-align: center;
  color: #fff; background: rgba(124,92,255,.55);
}
.post blockquote {
  margin: 20px 0; padding: 14px 18px; border-left: 3px solid var(--p);
  background: var(--panel); border-radius: 0 var(--r) var(--r) 0; color: var(--tx-2);
}
.post code {
  font-family: Consolas, Monaco, monospace; font-size: .88em; padding: 2px 6px;
  border-radius: 5px; background: rgba(124,92,255,.16); color: #B9C4FF;
}
.post strong { color: #fff; font-weight: 700; }
.post a { color: var(--c); border-bottom: 1px solid rgba(34,211,238,.4); }

/* ---------- 文末署名 / 更新时间 ---------- */
.byline {
  margin-top: 40px; padding-top: 22px; border-top: 1px solid var(--line);
  display: flex; flex-wrap: wrap; gap: 10px 20px; font-size: 13.5px; color: var(--tx-3);
}
.byline b { color: var(--tx-2); font-weight: 600; }

/* ---------- 上下篇 ---------- */
.pager { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; margin: 26px 0 0; }
.pager__item {
  display: block; padding: 16px 18px; border-radius: var(--r);
  background: var(--panel); border: 1px solid var(--line); transition: border-color .25s, transform .25s;
}
.pager__item:hover { border-color: var(--line-2); transform: translateY(-2px); }
.pager__dir { font-size: 12px; color: var(--c); letter-spacing: .1em; font-weight: 600; }
.pager__t { font-size: 15px; color: var(--tx); margin-top: 6px; line-height: 1.6; }

/* ---------- 列表页卡片 ---------- */
.news-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(310px, 1fr)); gap: 18px; margin-top: 30px; }
.news-card {
  display: flex; flex-direction: column; padding: 22px; border-radius: var(--r-lg);
  background: var(--panel); border: 1px solid var(--line); transition: transform .28s var(--ease), border-color .28s, box-shadow .28s;
}
.news-card:hover {
  transform: translateY(-4px); border-color: var(--line-2);
  box-shadow: 0 18px 40px -22px rgba(124,92,255,.7);
}
.news-card__top { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.news-card__date { font-size: 12.5px; color: var(--tx-3); }
.news-card__t { font-size: 18px; font-weight: 700; line-height: 1.55; color: #fff; }
.news-card__t a { border: 0; }
.news-card:hover .news-card__t { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.news-card__s { margin-top: 10px; font-size: 14.5px; line-height: 1.8; color: var(--tx-2); flex: 1; }
.news-card__more { margin-top: 14px; font-size: 13.5px; color: var(--c); font-weight: 600; }

/* ---------- 首页「AI 观察」板块 ---------- */
.insights-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; margin-top: 26px; }
.insights-more { display: inline-flex; align-items: center; gap: 6px; margin-top: 24px; }

/* ---------- 移动端 ---------- */
@media (max-width: 640px) {
  .art-hero { padding-top: 92px; }
  .post { font-size: 16px; }
  .news-grid { grid-template-columns: 1fr; }
}