.page-news {
  --news-region: #4FE3C1;
  --news-version: #35A98F;
  --news-method: #6FB8A5;
  --news-feedback: #4A7A6C;
  --news-band: rgba(79, 227, 193, .05);
  --news-band-alt: rgba(20, 48, 40, .42);
  --news-axis: var(--c-accent);
}

/* ---------- 首屏框景 ---------- */
.page-news .news-hero {
  padding-block: clamp(20px, 3vw, 36px) clamp(28px, 4vw, 52px);
}

.page-news .hero-frame {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 52px) clamp(20px, 3.4vw, 48px) clamp(28px, 4vw, 46px);
  border: 1px solid var(--c-line);
  background:
    linear-gradient(180deg, rgba(20, 48, 40, .78), rgba(14, 31, 26, .34));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 38px), calc(100% - 38px) 100%, 0 100%);
}

.page-news .hero-frame::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 9px;
  background: repeating-linear-gradient(90deg, var(--c-tick) 0 1px, transparent 1px 13px);
  opacity: .55;
  pointer-events: none;
}

.page-news .hero-frame::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 132px;
  height: 132px;
  background: repeating-linear-gradient(180deg, var(--c-tick) 0 1px, transparent 1px 13px);
  opacity: .22;
  pointer-events: none;
}

.page-news .hero-frame .display {
  margin: 10px 0 0;
  max-width: 18ch;
}

.page-news .hero-frame .section-lead {
  margin-top: clamp(14px, 2vw, 22px);
  max-width: 46ch;
}

.page-news .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}

.page-news .hero-stat {
  background: var(--c-canvas);
  padding: 14px 16px 16px;
  min-width: 0;
}

.page-news .hero-stat dt {
  font-size: var(--fs-index);
  letter-spacing: .06em;
  color: var(--c-muted);
}

.page-news .hero-stat dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 300;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--c-accent);
}

/* ---------- 系列索引带 ---------- */
.page-news .series-band-section {
  padding-block: clamp(6px, 1vw, 12px) clamp(24px, 3vw, 40px);
}

.page-news .series-band-section .index {
  margin-bottom: 12px;
}

.page-news .series-band {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 8px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-news .series-chip {
  flex: 0 0 auto;
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 158px;
  padding: 13px 20px 14px;
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--chip-color, var(--c-accent));
  border-radius: var(--radius-capsule);
  background: var(--news-band-alt);
  color: var(--c-text);
  text-decoration: none;
  transition: border-color .16s var(--ease), background-color .12s var(--ease);
}

.page-news .series-chip:hover,
.page-news .series-chip:focus-visible {
  border-color: var(--c-accent);
  border-left-color: var(--chip-color, var(--c-accent));
  background: var(--c-accent-soft);
}

.page-news .series-chip--region { --chip-color: var(--news-region); }
.page-news .series-chip--version { --chip-color: var(--news-version); }
.page-news .series-chip--method { --chip-color: var(--news-method); }
.page-news .series-chip--feedback { --chip-color: var(--news-feedback); }

.page-news .series-chip-num {
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--c-muted);
}

.page-news .series-chip-name {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -.01em;
}

.page-news .series-chip-meta {
  font-size: 12px;
  color: var(--c-muted);
}

/* ---------- 头条 ---------- */
.page-news .news-stream {
  padding-block: clamp(20px, 3vw, 36px) clamp(36px, 5vw, 64px);
}

.page-news .hero-item {
  margin-top: clamp(26px, 4vw, 44px);
  padding-bottom: clamp(24px, 3.4vw, 40px);
  border-bottom: 1px solid var(--c-line);
}

.page-news .hero-item-media {
  margin: 0 0 clamp(18px, 2.6vw, 30px);
}

.page-news .hero-item-body {
  max-width: 62ch;
}

.page-news .hero-item-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-index);
  letter-spacing: .04em;
  color: var(--c-muted);
}

.page-news .hero-item-series {
  color: var(--news-region);
}

.page-news .hero-item-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -.02em;
  color: var(--c-text);
}

.page-news .hero-item-body p {
  margin: 0 0 10px;
  max-width: 40ch;
}

/* ---------- 条目列表 ---------- */
.page-news .news-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-news .news-item {
  position: relative;
  padding: clamp(18px, 2.4vw, 26px) clamp(14px, 2vw, 26px) clamp(18px, 2.4vw, 26px) clamp(20px, 2.6vw, 34px);
  border-bottom: 1px solid var(--c-line);
  transition: background-color .14s var(--ease);
}

.page-news .news-item:nth-child(odd) {
  background: var(--news-band);
}

.page-news .news-item:hover,
.page-news .news-item[open] {
  background: rgba(79, 227, 193, .085);
}

.page-news .news-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: clamp(18px, 2.4vw, 26px);
  bottom: clamp(18px, 2.4vw, 26px);
  width: 2px;
  background: var(--news-axis);
  transition: width .14s var(--ease);
}

.page-news .news-item[open]::before {
  width: 5px;
}

.page-news .news-item--region { --news-axis: var(--news-region); }
.page-news .news-item--version { --news-axis: var(--news-version); }
.page-news .news-item--method { --news-axis: var(--news-method); }
.page-news .news-item--feedback { --news-axis: var(--news-feedback); }

.page-news .news-item > summary {
  display: flex;
  flex-direction: column;
  gap: 7px;
  position: relative;
  padding-right: 30px;
  cursor: pointer;
  list-style: none;
}

.page-news .news-item > summary::-webkit-details-marker {
  display: none;
}

.page-news .news-item > summary::marker {
  content: "";
}

.page-news .news-item > summary::after {
  content: "";
  position: absolute;
  right: 2px;
  top: .5em;
  width: 9px;
  height: 9px;
  border-right: 1.5px solid var(--c-muted);
  border-bottom: 1.5px solid var(--c-muted);
  transform: rotate(45deg);
  transition: transform .16s var(--ease), border-color .16s var(--ease);
}

.page-news .news-item[open] > summary::after {
  transform: rotate(-135deg);
  border-color: var(--news-axis);
}

.page-news .news-item > summary:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 5px;
  border-radius: 3px;
}

.page-news .news-item-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--c-muted);
}

.page-news .news-item-series {
  color: var(--news-axis);
}

.page-news .news-item-title {
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 24px);
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: -.015em;
  color: var(--c-text);
  background-image: linear-gradient(var(--c-accent), var(--c-accent));
  background-repeat: no-repeat;
  background-size: 0% 1px;
  background-position: 0 100%;
  transition: background-size .14s var(--ease);
}

.page-news .news-item:hover .news-item-title,
.page-news .news-item:focus-within .news-item-title {
  background-size: 100% 1px;
}

.page-news .news-item-summary {
  margin: 12px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--c-muted);
}

/* ---------- 深度系列块 ---------- */
.page-news .series-deep {
  padding-block: clamp(30px, 4.4vw, 58px);
  border-top: 1px solid var(--c-line);
}

.page-news .deep-grid {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
}

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

.page-news .deep-body .section-title {
  margin: 8px 0 14px;
}

.page-news .deep-body p {
  max-width: 42ch;
}

.page-news .deep-tail {
  margin-top: 18px;
}

.page-news .deep-link {
  display: inline-block;
  padding-bottom: 2px;
  font-size: 15px;
  color: var(--c-accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(79, 227, 193, .45);
  transition: border-color .14s var(--ease), color .14s var(--ease);
}

.page-news .deep-link:hover,
.page-news .deep-link:focus-visible {
  border-bottom-color: var(--c-accent);
}

.page-news .series-points {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
}

.page-news .series-points li {
  position: relative;
  padding: 10px 0 10px 22px;
  border-top: 1px dashed rgba(31, 74, 61, .85);
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-muted);
}

.page-news .series-points li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 19px;
  width: 8px;
  height: 1px;
  background: var(--c-accent);
}

/* ---------- 阶段轨道 ---------- */
.page-news .series-deep--version .section-head {
  margin-bottom: clamp(22px, 3vw, 36px);
}

.page-news .series-deep--version .section-lead {
  max-width: 52ch;
}

.page-news .phase-track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--c-line);
  border-block: 1px solid var(--c-line);
}

.page-news .phase-step {
  position: relative;
  background: var(--c-canvas);
  padding: clamp(16px, 2.2vw, 24px) clamp(16px, 2vw, 26px) clamp(16px, 2.2vw, 24px) clamp(22px, 2.6vw, 32px);
}

.page-news .phase-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: clamp(16px, 2.2vw, 24px);
  width: 4px;
  height: 26px;
  background: var(--news-version);
}

.page-news .phase-num {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--c-muted);
}

.page-news .phase-name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 700;
  letter-spacing: -.015em;
  color: var(--c-text);
}

.page-news .phase-step p:last-child {
  margin: 0;
  max-width: 44ch;
  font-size: 15px;
  line-height: 1.72;
  color: var(--c-muted);
}

.page-news .version-media {
  margin: clamp(24px, 3.4vw, 40px) 0 0;
}

/* ---------- 方法与反馈双栏 ---------- */
.page-news .series-pair {
  padding-block: clamp(30px, 4.4vw, 58px);
  border-top: 1px solid var(--c-line);
}

.page-news .pair-grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

.page-news .pair-col .section-title {
  margin: 8px 0 14px;
}

.page-news .pair-col p {
  max-width: 42ch;
}

.page-news .pair-media {
  margin: 0 0 clamp(18px, 2.4vw, 26px);
}

/* ---------- 尾部链接轨道 ---------- */
.page-news .news-links {
  padding-block: clamp(28px, 4vw, 52px) clamp(40px, 6vw, 80px);
  border-top: 1px solid var(--c-line);
}

.page-news .news-links .section-title {
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

.page-news .link-rail {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
}

.page-news .link-rail a {
  display: inline-block;
  padding: 9px 18px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-capsule);
  font-size: 14px;
  color: var(--c-text);
  text-decoration: none;
  transition: border-color .16s var(--ease), background-color .12s var(--ease), color .14s var(--ease);
}

.page-news .link-rail a:hover,
.page-news .link-rail a:focus-visible {
  border-color: var(--c-accent);
  background: var(--c-accent-soft);
  color: var(--c-accent);
}

/* ---------- 图片兜底 ---------- */
.page-news img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-news .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-news .phase-track {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-news .deep-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: start;
  }

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

  .page-news .pair-col + .pair-col {
    padding-left: clamp(24px, 3vw, 44px);
    border-left: 1px solid var(--c-line);
  }
}

@media (min-width: 1080px) {
  .page-news .phase-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-news .series-band {
    flex-wrap: wrap;
    overflow-x: visible;
  }

  .page-news .series-chip {
    flex: 1 1 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-news *,
  .page-news *::before,
  .page-news *::after {
    transition-duration: .001ms !important;
    animation-duration: .001ms !important;
  }
}