.page-news {
  --news-sticky-top: 60px;
  --news-gap-lg: clamp(52px, 8vw, 112px);
  --news-gap-md: clamp(24px, 4vw, 44px);
  --news-rail: 76px;
  padding-bottom: clamp(56px, 8vw, 110px);
}

.page-news .news-hero {
  display: grid;
  gap: var(--news-gap-md);
  padding: clamp(24px, 4vw, 56px) 0 var(--news-gap-lg);
}

.page-news .news-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(36px, 7.4vw, 76px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--ivory);
  margin: 14px 0 0;
}

.page-news .news-title::after {
  content: "";
  display: block;
  width: clamp(84px, 18vw, 168px);
  height: 3px;
  margin-top: 24px;
  background: linear-gradient(90deg, var(--gold), var(--neon));
}

.page-news .news-lede {
  margin-top: 22px;
  max-width: var(--measure);
  color: var(--ivory);
  opacity: 0.9;
}

.page-news .news-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 24px 0 26px;
}

.page-news .news-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-news .news-hero-figure {
  margin: 0;
}

.page-news .news-hero-figure .figure-media {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-layer);
}

.page-news .news-hero-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-news .figure-media {
  overflow: hidden;
  border-radius: var(--radius);
}

.page-news .figure-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.page-news .news-h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(25px, 4vw, 42px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--ivory);
  margin: 12px 0 16px;
  max-width: 22em;
}

/* 版本阶段筛选 */
.page-news .stage-radio {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.page-news .stage-filter {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: 4px 0 22px;
  scrollbar-width: none;
}

.page-news .stage-filter::-webkit-scrollbar {
  display: none;
}

.page-news .stage-chip {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  font-size: 14px;
  color: var(--graphite);
  cursor: pointer;
  user-select: none;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-news .stage-chip:hover {
  color: var(--ivory);
  border-color: var(--line-strong);
}

.page-news .chip-no {
  font-size: 12px;
  color: var(--cyan);
}

.page-news #stage-all:checked ~ .stage-filter .stage-chip[for="stage-all"],
.page-news #stage-v3:checked ~ .stage-filter .stage-chip[for="stage-v3"],
.page-news #stage-v2:checked ~ .stage-filter .stage-chip[for="stage-v2"],
.page-news #stage-v1:checked ~ .stage-filter .stage-chip[for="stage-v1"] {
  color: var(--ink-deepest);
  background: linear-gradient(120deg, var(--gold), var(--gold-bright));
  border-color: var(--gold-bright);
}

.page-news #stage-all:checked ~ .stage-filter .stage-chip[for="stage-all"] .chip-no,
.page-news #stage-v3:checked ~ .stage-filter .stage-chip[for="stage-v3"] .chip-no,
.page-news #stage-v2:checked ~ .stage-filter .stage-chip[for="stage-v2"] .chip-no,
.page-news #stage-v1:checked ~ .stage-filter .stage-chip[for="stage-v1"] .chip-no {
  color: rgba(5, 17, 15, 0.62);
}

.page-news #stage-all:focus-visible ~ .stage-filter .stage-chip[for="stage-all"],
.page-news #stage-v3:focus-visible ~ .stage-filter .stage-chip[for="stage-v3"],
.page-news #stage-v2:focus-visible ~ .stage-filter .stage-chip[for="stage-v2"],
.page-news #stage-v1:focus-visible ~ .stage-filter .stage-chip[for="stage-v1"] {
  outline: 2px solid var(--gold-bright);
  outline-offset: 3px;
}

/* 筛选生效：仅前端显示控制，未执行脚本时全部条目照常可读 */
.page-news .news-feed:has(#stage-v3:checked) .feed-group:not([data-stage="v3"]) {
  display: none;
}
.page-news .news-feed:has(#stage-v2:checked) .feed-group:not([data-stage="v2"]) {
  display: none;
}
.page-news .news-feed:has(#stage-v1:checked) .feed-group:not([data-stage="v1"]) {
  display: none;
}

/* 时间轴 + 条目流 */
.page-news .feed-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.page-news .feed-rail {
  display: none;
}

.page-news .feed-group {
  padding-bottom: clamp(40px, 7vw, 88px);
}

.page-news .feed-group:last-child {
  padding-bottom: 0;
}

.page-news .feed-group-head {
  position: sticky;
  top: var(--news-sticky-top);
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 0 12px;
  background: var(--ink-base);
  border-bottom: 1px solid var(--line-hair);
}

.page-news .group-code {
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--gold);
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  padding: 3px 8px;
}

.page-news .group-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.6vw, 26px);
  color: var(--ivory);
  margin: 0;
}

.page-news .group-note {
  max-width: var(--measure);
  margin: 16px 0 24px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--graphite);
}

.page-news .feed-item {
  position: relative;
  padding: 24px 0 24px clamp(16px, 3vw, 30px);
  border-top: 1px solid var(--line-hair);
}

.page-news .feed-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 30px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ink-base);
  border: 1px solid var(--line-soft);
  transition: background 200ms var(--ease), border-color 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-news .feed-item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--gold), rgba(201, 162, 39, 0));
  opacity: 0;
  transition: opacity 200ms var(--ease);
}

.page-news .feed-item:hover::before {
  background: var(--gold);
  border-color: var(--gold-bright);
  box-shadow: 0 0 0 4px rgba(201, 162, 39, 0.16);
}

.page-news .feed-item:hover::after {
  opacity: 1;
}

.page-news .feed-item-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
}

.page-news .item-no {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gold);
  padding-right: 4px;
  border-right: 1px solid var(--line-soft);
}

.page-news .tag-accent {
  border-color: var(--line-cool);
  color: var(--cyan);
}

.page-news .feed-item-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.3vw, 25px);
  line-height: 1.4;
  color: var(--ivory);
  margin: 12px 0 10px;
  max-width: 26em;
}

.page-news .feed-item-body {
  margin: 0;
  max-width: var(--measure);
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--graphite);
}

/* 活动周期 */
.page-news .cycle-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 64px);
}

.page-news .cycle-ring {
  position: relative;
  width: 100%;
  max-width: 340px;
  margin: 0 auto;
}

.page-news .cycle-ring svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-news .ring-seg {
  stroke: rgba(242, 239, 230, 0.16);
}

.page-news .ring-seg.is-now {
  stroke: var(--gold);
}

.page-news .cycle-center {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  text-align: center;
  margin: 0;
}

.page-news .cycle-now-label {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--graphite);
  text-transform: uppercase;
}

.page-news .cycle-now {
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 30px);
  color: var(--gold-bright);
}

.page-news .cycle-now-sub {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-news .cycle-side {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
}

.page-news .cycle-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 4px;
}

.page-news .cycle-step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--line-hair);
}

.page-news .cycle-step.is-now {
  border-top-color: var(--line-strong);
  background: linear-gradient(90deg, rgba(201, 162, 39, 0.1), rgba(201, 162, 39, 0));
}

.page-news .step-no {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gold);
  padding-top: 4px;
}

.page-news .step-title {
  font-family: var(--font-display);
  font-size: clamp(17px, 2vw, 20px);
  color: var(--ivory);
  margin: 0 0 8px;
}

.page-news .step-text {
  margin: 0;
  max-width: var(--measure);
  font-size: 15px;
  line-height: 1.8;
  color: var(--graphite);
}

.page-news .cycle-figure {
  margin: 0;
}

.page-news .cycle-figure .figure-media {
  border: 1px solid var(--line-hair);
  background: var(--ink-layer);
}

.page-news .cycle-figure img {
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

/* 专题系列 */
.page-news .topic-track {
  list-style: none;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(258px, 80vw);
  gap: clamp(14px, 3vw, 24px);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 4px 0 18px;
  scrollbar-width: thin;
}

.page-news .topic-track::-webkit-scrollbar {
  height: 6px;
}

.page-news .topic-track::-webkit-scrollbar-thumb {
  background: var(--line-soft);
}

.page-news .topic-card {
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid var(--line-hair);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.01));
  transition: border-color 200ms var(--ease), box-shadow 200ms var(--ease), transform 200ms var(--ease);
}

.page-news .topic-card:hover {
  border-color: var(--line-strong);
  box-shadow: 0 18px 40px rgba(5, 17, 15, 0.5);
  transform: translateY(-3px);
}

.page-news .topic-media {
  margin: -4px 0 4px;
  overflow: hidden;
  border-radius: var(--radius);
}

.page-news .topic-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-news .topic-code {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  margin: 0;
}

.page-news .topic-title {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.4vw, 24px);
  color: var(--ivory);
  margin: 0;
}

.page-news .topic-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--graphite);
}

.page-news .topic-meta {
  margin: auto 0 0;
  padding-top: 10px;
  border-top: 1px solid var(--line-hair);
  font-size: 12.5px;
  color: var(--graphite);
}

.page-news .topic-hint {
  margin: 6px 0 0;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--graphite);
}

/* 订阅与回溯 */
.page-news .sub-banner {
  display: grid;
  gap: 26px;
  padding: clamp(24px, 4vw, 46px);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--gradient-mist);
}

.page-news .sub-banner-copy .news-h2 {
  margin-bottom: 14px;
}

.page-news .sub-switch {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-news .sub-input {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  border: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.page-news .sub-label {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  cursor: pointer;
  width: fit-content;
}

.page-news .sub-track {
  position: relative;
  width: 58px;
  height: 30px;
  border-radius: 999px;
  border: 1px solid var(--line-soft);
  background: rgba(255, 255, 255, 0.06);
  transition: background 180ms var(--ease), border-color 180ms var(--ease);
}

.page-news .sub-knob {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--graphite);
  transition: transform 180ms var(--ease), background 180ms var(--ease);
}

.page-news .sub-text {
  font-size: 15px;
  color: var(--ivory);
}

.page-news .sub-input:checked + .sub-label .sub-track {
  background: rgba(226, 58, 120, 0.24);
  border-color: rgba(226, 58, 120, 0.72);
}

.page-news .sub-input:checked + .sub-label .sub-knob {
  transform: translateX(28px);
  background: var(--neon);
}

.page-news .sub-input:focus-visible + .sub-label .sub-track {
  outline: 2px solid var(--gold-bright);
  outline-offset: 3px;
}

.page-news .sub-state {
  margin: 0;
  font-size: 12.5px;
  color: var(--graphite);
}

.page-news .sub-state .state-on,
.page-news .sub-state .state-off {
  display: none;
}

.page-news .sub-input:checked ~ .sub-state .state-on {
  display: inline;
}

.page-news .sub-input:not(:checked) ~ .sub-state .state-off {
  display: inline;
}

.page-news .backtrack {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  margin-top: clamp(40px, 6vw, 72px);
}

.page-news .backtrack-title {
  font-family: var(--font-display);
  font-size: clamp(21px, 3vw, 30px);
  color: var(--ivory);
  margin: 0 0 14px;
}

.page-news .backtrack-text {
  margin: 0 0 22px;
  max-width: var(--measure);
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--graphite);
}

.page-news .backtrack-list {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-news .backtrack-list li {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  max-width: var(--measure);
  font-size: 15px;
  line-height: 1.8;
  color: var(--graphite);
}

.page-news .bk-code {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gold);
  padding-top: 3px;
}

.page-news .backtrack-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-news .backtrack-figure {
  margin: 0;
  max-width: 300px;
}

.page-news .backtrack-figure .figure-media {
  border: 1px solid var(--line-soft);
  background: var(--ink-layer);
}

.page-news .backtrack-figure img {
  aspect-ratio: 9 / 16;
  object-fit: cover;
}

.page-news .action-strip {
  margin-top: clamp(36px, 5vw, 64px);
}

@media (min-width: 720px) {
  .page-news {
    --news-sticky-top: 70px;
  }

  .page-news .topic-track {
    grid-auto-columns: minmax(300px, 360px);
  }

  .page-news .backtrack {
    grid-template-columns: minmax(0, 1fr) 280px;
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-news {
    --news-sticky-top: 78px;
  }

  .page-news .feed-grid {
    grid-template-columns: var(--news-rail) minmax(0, 1fr);
    column-gap: clamp(20px, 4vw, 56px);
  }

  .page-news .feed-rail {
    display: flex;
    flex-direction: column;
    align-items: center;
    align-self: start;
    position: sticky;
    top: calc(var(--news-sticky-top) + 24px);
    height: 320px;
    padding-top: 6px;
  }

  .page-news .rail-node {
    width: 11px;
    height: 11px;
    border-radius: 50%;
    border: 1px solid var(--line-strong);
    background: var(--ink-base);
    flex: 0 0 auto;
  }

  .page-news .rail-node.is-active {
    background: var(--gold);
    border-color: var(--gold-bright);
    box-shadow: 0 0 0 5px rgba(201, 162, 39, 0.14);
  }

  .page-news .rail-line {
    flex: 1 1 auto;
    width: 1px;
    background: linear-gradient(180deg, var(--line-soft), rgba(79, 209, 197, 0.24));
  }

  .page-news .cycle-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }

  .page-news .cycle-ring {
    position: sticky;
    top: calc(var(--news-sticky-top) + 32px);
    max-width: 380px;
  }
}

@media (min-width: 1024px) {
  .page-news .news-hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: end;
    gap: clamp(32px, 5vw, 80px);
  }

  .page-news .sub-banner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}