/* ================= 动态观察 / page-news ================= */
.page-news {
  --news-index-w: 288px;
  --news-row: clamp(18px, 2.2vw, 24px);
}

.page-news .news-crumb {
  padding-top: calc(var(--shell-h) + 18px);
  padding-bottom: 4px;
}

/* ---------- 首屏 ---------- */
.page-news .news-hero {
  padding: clamp(28px, 5vh, 56px) 0 clamp(36px, 5vw, 64px);
}

.page-news .hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.5vw, 52px);
}

.page-news .news-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(46px, 8.4vw, 104px);
  line-height: .9;
  letter-spacing: -.035em;
  color: var(--white);
  margin: 12px 0 0;
}

.page-news .hero-body .lede {
  margin: 0;
  max-width: 52ch;
  font-size: clamp(15.5px, 1.4vw, 17px);
  line-height: 1.8;
  color: var(--muted);
}

.page-news .hero-axis {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
}

.page-news .hero-axis li {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 13px;
  color: var(--white);
}

.page-news .hero-axis .mono {
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--blue);
}

@media (min-width: 960px) {
  .page-news .hero-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: end;
  }
}

/* ---------- 置顶专题 ---------- */
.page-news .news-feature {
  padding: clamp(36px, 5.5vw, 76px) 0;
  border-top: 1px solid var(--line);
}

.page-news .feature-head {
  margin-bottom: clamp(22px, 3vw, 38px);
}

.page-news .feature-head .section-title {
  font-size: clamp(28px, 3.6vw, 46px);
  letter-spacing: -.02em;
  margin: 8px 0 0;
}

.page-news .feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3vw, 44px);
}

.page-news .feature-media {
  margin: 0;
}

.page-news .feature-body .feature-kicker {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--blue);
}

.page-news .feature-title {
  font-family: var(--font-display);
  font-size: clamp(22px, 2.6vw, 32px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -.015em;
  color: var(--white);
  margin: 0 0 14px;
}

.page-news .feature-lede {
  margin: 0 0 22px;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-news .feature-index {
  border-top: 1px solid var(--line);
}

.page-news .feature-index .expand-summary {
  padding: 15px 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--white);
}

.page-news .feature-index .expand-body p {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

@media (min-width: 1024px) {
  .page-news .feature-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 动态流 ---------- */
.page-news .news-stream {
  padding: clamp(36px, 5.5vw, 76px) 0;
  border-top: 1px solid var(--line);
}

.page-news .stream-head {
  margin-bottom: clamp(22px, 3vw, 38px);
}

.page-news .stream-head .section-title {
  font-size: clamp(28px, 3.6vw, 46px);
  letter-spacing: -.02em;
  margin: 8px 0 0;
}

.page-news .stream-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 48px);
}

/* 左侧索引 */
.page-news .stream-index-title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .2em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-news .stream-index-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

.page-news .stream-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: none;
}

.page-news .stream-tabs::-webkit-scrollbar {
  display: none;
}

.page-news .stream-tabs .tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: transparent;
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 13.5px;
  cursor: pointer;
  transition: color .16s var(--ease), border-color .16s var(--ease), background-color .16s var(--ease);
}

.page-news .stream-tabs .tab-btn:hover {
  color: var(--white);
  border-color: rgba(46, 123, 255, .55);
}

.page-news .stream-tabs .tab-btn[aria-selected="true"] {
  color: var(--white);
  border-color: var(--blue);
  background: rgba(46, 123, 255, .14);
}

.page-news .stream-tabs .tabs-count {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: .06em;
}

.page-news .stream-tabs .tab-btn[aria-selected="true"] .tabs-count {
  color: var(--green);
}

.page-news .stream-cadence {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.page-news .stream-cadence h3 {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .2em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-news .cadence-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-news .cadence-list li {
  position: relative;
  padding-left: 14px;
  font-size: 13px;
  line-height: 1.68;
  color: var(--muted);
}

.page-news .cadence-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 5px;
  height: 1px;
  background: var(--blue);
}

.page-news .cadence-list .mono {
  margin-right: 4px;
  font-size: 12px;
  color: var(--white);
}

.page-news .stream-subscribe {
  margin-top: 24px;
  padding: 16px;
  border: 1px solid rgba(46, 123, 255, .3);
  border-radius: var(--radius);
  background: rgba(27, 42, 68, .38);
}

.page-news .stream-subscribe h3 {
  margin: 0 0 8px;
  font-size: 14px;
  font-weight: 700;
  color: var(--white);
}

.page-news .stream-subscribe p {
  margin: 0 0 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-news .stream-subscribe .btn {
  font-size: 12.5px;
}

/* 右侧条目 */
.page-news .stream-feed {
  min-width: 0;
}

.page-news [data-tab-panel][hidden] {
  display: none;
}

.page-news .feed-media {
  margin: 0 0 22px;
  max-width: 620px;
}

.page-news .feed-media--season {
  margin-top: 22px;
}

.page-news .news-item {
  position: relative;
  padding: var(--news-row) 0 var(--news-row) 18px;
  border-top: 1px solid var(--line);
  transition: background-color .18s var(--ease);
}

.page-news .news-item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-news .news-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--orange);
  opacity: 0;
  transform: scaleY(.35);
  transform-origin: top;
  transition: opacity .18s var(--ease), transform .18s var(--ease);
}

.page-news .news-item:hover {
  background: rgba(46, 123, 255, .06);
}

.page-news .news-item:hover::before {
  opacity: 1;
  transform: scaleY(1);
}

.page-news .item-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.page-news .news-tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--muted);
  white-space: nowrap;
}

.page-news .news-tag--release {
  color: var(--green);
  border-color: rgba(61, 220, 132, .45);
}

.page-news .news-tag--season {
  color: var(--blue);
  border-color: rgba(46, 123, 255, .45);
}

.page-news .news-tag--tech {
  color: var(--muted);
  border-color: var(--line);
}

.page-news .news-tag--partner {
  color: var(--orange);
  border-color: rgba(255, 122, 47, .45);
}

.page-news .news-tag--trend {
  color: var(--white);
  border-color: rgba(242, 245, 248, .3);
}

.page-news .item-time {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
  white-space: nowrap;
  text-align: right;
}

.page-news .item-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(17.5px, 2.1vw, 22px);
  font-weight: 700;
  line-height: 1.42;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-news .item-summary {
  margin: 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-news .item-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
  gap: 12px 18px;
  margin: 16px 0 0;
  padding: 13px 15px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--blue);
  border-radius: var(--radius);
  background: rgba(20, 24, 31, .72);
}

.page-news .item-facts dt {
  margin-bottom: 5px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--muted);
}

.page-news .item-facts dd {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--white);
}

.page-news .item-facts .accent-green {
  color: var(--green);
}

/* ---------- 收尾 ---------- */
.page-news .news-cta {
  padding: clamp(36px, 5.5vw, 76px) 0 clamp(52px, 8vw, 100px);
  border-top: 1px solid var(--line);
}

.page-news .cta-panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 40px);
  padding: clamp(22px, 3vw, 40px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(27, 42, 68, .62), rgba(20, 24, 31, .92));
}

.page-news .cta-panel h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(22px, 2.8vw, 34px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-news .cta-panel p {
  margin: 0;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-news .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-content: start;
}

@media (min-width: 860px) {
  .page-news .cta-panel {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: center;
  }
}

/* ---------- 桌面栅格 ---------- */
@media (min-width: 920px) {
  .page-news .stream-layout {
    grid-template-columns: var(--news-index-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-news .stream-index {
    position: sticky;
    top: calc(var(--shell-h) + 28px);
  }

  .page-news .stream-tabs {
    flex-direction: column;
    flex-wrap: nowrap;
    align-items: stretch;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-news .stream-tabs .tab-btn {
    width: 100%;
    justify-content: space-between;
  }
}

@media (min-width: 1180px) {
  .page-news {
    --news-index-w: 320px;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-news .news-item,
  .page-news .news-item::before,
  .page-news .stream-tabs .tab-btn {
    transition: none;
  }

  .page-news .news-item::before {
    transform: scaleY(1);
  }
}