/* 科技新媒体：深色资讯流 + 渐变强调 */
:root { --bg: #0b1020; --surf: #131a30; --surf2: #1a2340; --line: #232d4d; --ink: #e8ecf8; --muted: #8b97b8; --acc: #35d0ff; --acc2: #7c6cff; }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.75 -apple-system, "Segoe UI", "Microsoft YaHei", Arial, sans-serif; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul, ol { margin: 0; padding: 0; }
.wrap { max-width: 1240px; margin: 0 auto; padding: 0 18px; }

.tk-hd { position: sticky; top: 0; z-index: 20; background: rgba(11, 16, 32, .92); backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); }
.tk-hd-in { display: flex; align-items: center; gap: 20px; height: 62px; }
.tk-logo { font-size: 19px; font-weight: 800; display: flex; align-items: center; gap: 9px; white-space: nowrap; }
.tk-dot { width: 11px; height: 11px; border-radius: 3px; background: linear-gradient(135deg, var(--acc), var(--acc2)); }
.tk-nav { display: flex; gap: 4px; flex: 1; overflow-x: auto; }
.tk-nav a { padding: 7px 12px; border-radius: 8px; font-size: 14.5px; color: #c3ccE6; white-space: nowrap; }
.tk-nav a:hover { background: var(--surf2); color: #fff; }
.tk-tools { display: flex; align-items: center; gap: 12px; }
.search { display: flex; }
.search input { width: 150px; padding: 8px 12px; border: 1px solid var(--line); border-radius: 9px 0 0 9px; background: var(--surf); color: var(--ink); outline: none; font-size: 13.5px; }
.search button { padding: 8px 14px; border: 0; border-radius: 0 9px 9px 0; background: linear-gradient(135deg, var(--acc2), var(--acc)); color: #08101f; font-weight: 600; cursor: pointer; font-size: 13.5px; }
.langs { display: flex; gap: 6px; }
.langs a { font-size: 12.5px; padding: 5px 9px; border-radius: 999px; background: var(--surf2); color: var(--muted); }
.langs a.on { background: linear-gradient(135deg, var(--acc2), var(--acc)); color: #08101f; }

.tk-sec { margin: 26px 0; }
.tk-sec-hd { display: flex; align-items: center; gap: 14px; margin: 0 0 16px; }
.tk-sec-hd h2 { margin: 0; font-size: 19px; white-space: nowrap; }
.tk-line { flex: 1; height: 1px; background: linear-gradient(90deg, var(--line), transparent); }
.tk-chip { display: inline-block; font-size: 12px; padding: 2px 9px; border-radius: 999px; background: rgba(53, 208, 255, .14); color: var(--acc); margin-bottom: 10px; }
.tk-meta { color: var(--muted); font-size: 12.5px; }

/* Hero */
.tk-hero { display: grid; grid-template-columns: 1.9fr 1fr; gap: 16px; margin: 18px 0 4px; }
.tk-hero-card { position: relative; display: block; border-radius: 16px; overflow: hidden; border: 1px solid var(--line); min-height: 340px; }
.tk-hero-bg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.tk-hero-mask { position: relative; display: flex; flex-direction: column; justify-content: flex-end; padding: 26px; min-height: 340px; background: linear-gradient(180deg, rgba(11, 16, 32, .1) 30%, rgba(11, 16, 32, .92)); }
.tk-hero-mask h1 { margin: 0 0 10px; font-size: 28px; line-height: 1.4; }
.tk-hero-mask p { margin: 0 0 10px; color: #b9c3de; font-size: 14.5px; }
.tk-hero-side { display: flex; flex-direction: column; gap: 12px; }
.tk-mini { display: flex; gap: 12px; padding: 10px; background: var(--surf); border: 1px solid var(--line); border-radius: 12px; }
.tk-mini img { width: 108px; height: 72px; object-fit: cover; border-radius: 8px; flex: none; }
.tk-mini-tx b { display: block; font-size: 14.5px; line-height: 1.5; }
.tk-mini-tx b:hover { color: var(--acc); }
.tk-mini-tx em { font-style: normal; color: var(--muted); font-size: 12px; }

/* 卡片网格 */
.tk-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.tk-grid.two { grid-template-columns: repeat(2, 1fr); }
.tk-cell { display: block; background: var(--surf); border: 1px solid var(--line); border-radius: 14px; padding: 12px; transition: transform .2s, border-color .2s, box-shadow .2s; }
.tk-cell:hover { transform: translateY(-3px); border-color: #33406b; box-shadow: 0 14px 30px rgba(0, 0, 0, .35); }
.tk-cell-pic { display: block; height: 150px; border-radius: 10px; overflow: hidden; background: var(--surf2); }
.tk-cell-pic img { width: 100%; height: 100%; object-fit: cover; }
.tk-cell-tx { display: block; padding: 10px 4px 4px; }
.tk-cell-tx b { display: block; font-size: 16px; line-height: 1.5; }
.tk-cell-tx b:hover { color: var(--acc); }
.tk-cell-tx i { font-style: normal; display: block; color: var(--muted); font-size: 13.5px; margin: 6px 0; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.tk-cell-tx em { font-style: normal; color: #6f7ca0; font-size: 12px; }

/* 排行 / 分类 / 标签 */
.tk-two { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
.tk-rank li { list-style: none; counter-increment: t; border-bottom: 1px dashed var(--line); }
.tk-rank { counter-reset: t; }
.tk-rank li a { display: flex; gap: 10px; align-items: center; padding: 10px 0; font-size: 14.5px; }
.tk-rank li a:before { content: counter(t); flex: none; width: 21px; height: 21px; border-radius: 6px; background: var(--surf2); color: var(--acc); font-size: 11.5px; display: grid; place-items: center; }
.tk-rank li b { font-weight: 500; }
.tk-rank li b:hover { color: var(--acc); }
.tk-rank li span { margin-left: auto; color: var(--muted); font-size: 12px; }
.tk-cats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px 16px; }
.tk-cats a { display: flex; justify-content: space-between; padding: 8px 0; border-bottom: 1px dashed var(--line); font-size: 14px; }
.tk-cats em { font-style: normal; color: var(--muted); font-size: 12.5px; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tags a { padding: 5px 12px; border-radius: 999px; background: var(--surf2); color: #c3cce6; font-size: 12.5px; }
.tags a:hover { background: linear-gradient(135deg, var(--acc2), var(--acc)); color: #08101f; }

/* 栏目页 / 正文 */
.crumb { color: var(--muted); font-size: 13px; padding: 16px 0 0; }
.crumb a { color: var(--acc); }
.tk-cat { margin: 14px 0 6px; }
.tk-cat h1 { margin: 0 0 8px; font-size: 27px; }
.tk-cat p { margin: 0 0 14px; color: var(--muted); font-size: 14px; }
.search.big { max-width: 520px; margin-bottom: 8px; }
.search.big input { width: 100%; }
.tk-post { background: var(--surf); border: 1px solid var(--line); border-radius: 16px; padding: 28px 32px; margin: 18px 0; }
.tk-pt { margin: 4px 0 12px; font-size: 30px; line-height: 1.4; }
.tk-sub { display: flex; flex-wrap: wrap; gap: 16px; color: var(--muted); font-size: 13px; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
.tk-fig { margin: 18px 0 0; }
.tk-fig img { width: 100%; border-radius: 12px; }
.tk-content { margin-top: 18px; font-size: 16.5px; line-height: 1.95; color: #d5dcee; }
.tk-content h2 { font-size: 22px; margin: 28px 0 12px; color: #fff; }
.tk-content h3 { font-size: 18px; margin: 22px 0 10px; color: #fff; }
.tk-content p { margin: 0 0 16px; }
.tk-content img { border-radius: 12px; margin: 14px auto; }
.tk-content a { color: var(--acc); }
.tk-content blockquote { margin: 18px 0; padding: 12px 18px; background: var(--surf2); border-left: 3px solid var(--acc); color: #b9c3de; border-radius: 0 10px 10px 0; }
.tk-content ul, .tk-content ol { padding-left: 24px; }
.tk-post-tags { margin-top: 20px; padding-top: 14px; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.tk-pn { display: flex; justify-content: space-between; gap: 14px; margin-top: 16px; font-size: 14px; flex-wrap: wrap; }
.tk-pn a:hover { color: var(--acc); }
.tk-nf { text-align: center; padding: 60px 0; }
.tk-nf h1 { font-size: 76px; margin: 0; background: linear-gradient(135deg, var(--acc), var(--acc2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.tk-btn { display: inline-block; margin-top: 14px; padding: 10px 22px; border-radius: 10px; background: linear-gradient(135deg, var(--acc2), var(--acc)); color: #08101f; font-weight: 600; }

.ad { margin: 18px 0; text-align: center; }
.pagination { display: flex; gap: 6px; justify-content: center; align-items: center; margin: 26px 0; flex-wrap: wrap; }
.pagination a { padding: 7px 13px; border-radius: 9px; background: var(--surf); border: 1px solid var(--line); font-size: 13.5px; }
.pagination a.on { background: linear-gradient(135deg, var(--acc2), var(--acc)); color: #08101f; border-color: transparent; }
.pagination .info { color: var(--muted); font-size: 12.5px; margin-left: 6px; }

.tk-ft { background: #080d1a; border-top: 1px solid var(--line); margin-top: 40px; }
.tk-ft-in { display: grid; grid-template-columns: 2fr 1fr 1.5fr 1fr; gap: 22px; padding: 32px 0; }
.tk-col h4 { color: #fff; margin: 0 0 12px; font-size: 15px; }
.tk-col ul { padding: 0; }
.tk-col li { list-style: none; padding: 4px 0; font-size: 13.5px; }
.tk-col li a:hover { color: var(--acc); }
.tk-col p { color: var(--muted); font-size: 13.5px; }
.tk-ft .cp { font-size: 12.5px; opacity: .75; }
.tk-ft-btm { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; padding: 14px 0 28px; border-top: 1px solid var(--line); font-size: 12.5px; color: var(--muted); }
.tk-ft-btm span a { margin-left: 10px; }

@media (max-width: 980px) {
  .tk-hero { grid-template-columns: 1fr; }
  .tk-grid, .tk-grid.two { grid-template-columns: repeat(2, 1fr); }
  .tk-two { grid-template-columns: 1fr; }
  .tk-ft-in { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .tk-hd-in { height: auto; flex-wrap: wrap; padding: 10px 0; gap: 10px; }
  .tk-nav { order: 3; width: 100%; }
  .search input { width: 110px; }
  .tk-grid, .tk-grid.two { grid-template-columns: 1fr; }
  .tk-post { padding: 18px; }
  .tk-cats { grid-template-columns: 1fr; }
  .tk-ft-in { grid-template-columns: 1fr; }
}