.page-articles {
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-articles .obs-crumb {
  padding: var(--space-4) 0 var(--space-2);
}

/* ---------- 首屏：深色标题墙 ---------- */
.page-articles .obs-hero {
  position: relative;
  overflow: hidden;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-articles .obs-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-articles .obs-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: none;
  object-fit: cover;
}

.page-articles .obs-hero__scrim {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: var(--overlay-scrim);
}

.page-articles .obs-hero__inner {
  position: relative;
  z-index: 2;
  display: grid;
  gap: var(--space-6);
  padding-top: var(--space-8);
  padding-bottom: var(--space-6);
}

.page-articles .obs-hero__title {
  margin: var(--space-3) 0 0;
  font-family: var(--font-heading);
  font-size: var(--text-display);
  line-height: var(--leading-heading);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
  max-width: 18ch;
}

.page-articles .obs-hero__lede {
  margin: var(--space-3) 0 0;
  max-width: 44ch;
  font-size: var(--text-lg);
  line-height: 1.5;
  color: var(--color-contrast-ink);
}

.page-articles .obs-hero__figures {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4) var(--space-8);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-articles .obs-figure {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 800;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--color-contrast-accent);
}

.page-articles .obs-figure__cap {
  display: block;
  margin-top: var(--space-1);
  max-width: 22ch;
  font-size: var(--text-sm);
  line-height: 1.4;
  color: var(--color-contrast-ink);
}

/* 轮次索引 */
.page-articles .obs-roundindex__label {
  margin: 0 0 var(--space-2);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-contrast-accent);
}

.page-articles .obs-roundindex__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-articles .obs-roundindex__link {
  display: block;
  padding: var(--space-1) var(--space-2);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  font-variant-numeric: tabular-nums;
  text-decoration: none;
  white-space: nowrap;
}

.page-articles .obs-roundindex__link:hover {
  border-color: var(--color-contrast-accent);
  color: var(--color-contrast-accent);
}

/* ---------- 比分跑马灯 ---------- */
.page-articles .obs-ticker {
  position: relative;
  z-index: 2;
  overflow: hidden;
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-articles .obs-ticker__track {
  display: flex;
  width: max-content;
  margin: 0;
  padding: 0;
  list-style: none;
  animation: obs-marquee 48s linear infinite;
}

.page-articles .obs-ticker__item {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-right: var(--border-thin) solid var(--color-contrast-line);
  white-space: nowrap;
}

.page-articles .obs-ticker__round {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--color-contrast-accent);
}

.page-articles .obs-ticker__text {
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
}

.page-articles .obs-ticker:hover .obs-ticker__track,
.page-articles .obs-ticker:focus-within .obs-ticker__track {
  animation-play-state: paused;
}

@keyframes obs-marquee {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* ---------- 分类展签行 ---------- */
.page-articles .obs-filters {
  padding-top: var(--space-6);
  padding-bottom: var(--space-2);
}

.page-articles .obs-cats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-articles .obs-cat {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-size: var(--text-base);
  font-weight: 600;
  text-decoration: none;
}

.page-articles .obs-cat:hover {
  border-color: var(--color-primary);
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
}

.page-articles .obs-cat.is-active {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}

/* ---------- 主体：时间轴 + 观察流 ---------- */
.page-articles .obs-body {
  padding-top: var(--space-6);
  padding-bottom: var(--section-y);
}

.page-articles .obs-body__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

.page-articles .obs-timeline__list {
  display: flex;
  gap: var(--space-1);
  margin: 0;
  padding: 0 0 var(--space-2);
  list-style: none;
  overflow-x: auto;
}

.page-articles .obs-timeline__link {
  position: relative;
  display: block;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  color: var(--color-ink-soft);
  text-decoration: none;
  white-space: nowrap;
}

.page-articles .obs-timeline__round {
  display: block;
  font-size: var(--text-sm);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--color-ink);
}

.page-articles .obs-timeline__stage {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-articles .obs-timeline__link.is-current .obs-timeline__round {
  color: var(--color-primary);
}

/* ---------- 轮次区块 ---------- */
.page-articles .obs-round + .obs-round {
  margin-top: var(--space-8);
}

.page-articles .obs-round__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-3);
  margin-bottom: var(--space-4);
}

.page-articles .obs-round__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  font-variant-numeric: tabular-nums;
  color: var(--color-ink);
}

.page-articles .obs-round__meta {
  margin: 0;
  font-size: var(--text-sm);
  font-variant-numeric: tabular-nums;
  color: var(--color-ink-muted);
}

/* ---------- 观察条目 ---------- */
.page-articles .obs-item {
  display: block;
}

.page-articles .obs-item + .obs-item {
  margin-top: var(--space-2);
}

.page-articles .obs-item__head {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  cursor: pointer;
  list-style: none;
  transition: background-color 120ms cubic-bezier(0.2, 0, 0.2, 1),
              border-color 120ms cubic-bezier(0.2, 0, 0.2, 1);
}

.page-articles .obs-item__head::-webkit-details-marker {
  display: none;
}

.page-articles .obs-item__head::marker {
  content: "";
}

.page-articles .obs-item__head:hover {
  border-color: var(--color-primary);
  background-color: var(--color-primary-soft);
}

.page-articles .obs-item__tag {
  flex: 0 0 auto;
  display: inline-block;
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
  font-size: var(--text-sm);
  font-weight: 700;
  white-space: nowrap;
}

.page-articles .obs-item__title {
  flex: 1 1 auto;
  min-width: 0;
  font-size: var(--text-lg);
  font-weight: 600;
  line-height: 1.35;
  color: var(--color-ink);
}

.page-articles .obs-item__cue {
  position: relative;
  flex: 0 0 auto;
  width: 26px;
  height: 26px;
  border: var(--border-thin) solid var(--color-primary);
  border-radius: var(--radius-sm);
}

.page-articles .obs-item__cue::before,
.page-articles .obs-item__cue::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background-color: var(--color-primary);
  transform: translate(-50%, -50%);
}

.page-articles .obs-item__cue::before {
  width: 12px;
  height: 2px;
}

.page-articles .obs-item__cue::after {
  width: 2px;
  height: 12px;
}

.page-articles .obs-item[open] > .obs-item__head {
  background-color: var(--color-contrast-surface);
  border-color: var(--color-contrast-surface);
}

.page-articles .obs-item[open] > .obs-item__head .obs-item__title {
  color: var(--color-contrast-ink);
}

.page-articles .obs-item[open] > .obs-item__head .obs-item__tag {
  background-color: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
}

.page-articles .obs-item[open] > .obs-item__head .obs-item__cue {
  border-color: var(--color-contrast-accent);
}

.page-articles .obs-item[open] > .obs-item__head .obs-item__cue::before,
.page-articles .obs-item[open] > .obs-item__head .obs-item__cue::after {
  background-color: var(--color-contrast-accent);
}

.page-articles .obs-item[open] .obs-item__cue::after {
  opacity: 0;
}

.page-articles .obs-item__body {
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-top: 0;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  background-color: var(--color-surface-alt);
}

.page-articles .obs-item__body p {
  margin: 0 0 var(--space-2);
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-articles .obs-item__body p:last-child {
  margin-bottom: 0;
}

.page-articles .obs-item__body a,
.page-articles .obs-next__foot a {
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 图片条 ---------- */
.page-articles .obs-plate {
  position: relative;
  margin: var(--space-8) 0;
  overflow: hidden;
  border-radius: var(--radius-sm);
  background-color: var(--color-contrast-surface);
}

.page-articles .obs-plate__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-articles .obs-plate::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
}

.page-articles .obs-plate__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
  margin: 0;
  padding: var(--space-4);
  max-width: 48ch;
  font-size: var(--text-base);
  font-weight: 600;
  line-height: 1.5;
  color: var(--color-contrast-ink);
}

/* ---------- 行动出口 ---------- */
.page-articles .obs-next {
  padding-top: var(--section-y);
  padding-bottom: var(--section-y);
  background-color: var(--color-surface-alt);
}

.page-articles .obs-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-6);
}

.page-articles .obs-next__title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
}

.page-articles .obs-next__text {
  margin: 0 0 var(--space-3);
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

.page-articles .obs-next__actions {
  margin: 0 0 var(--space-2);
}

.page-articles .obs-next__item--primary {
  padding: var(--space-6);
  border-radius: var(--radius-sm);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-articles .obs-next__item--primary .obs-next__title {
  color: var(--color-contrast-ink);
}

.page-articles .obs-next__item--primary .obs-next__text,
.page-articles .obs-next__item--primary .obs-next__sub {
  color: var(--color-contrast-ink);
}

.page-articles .obs-next__item--second {
  padding: var(--space-6) 0 var(--space-2);
  border-top: var(--border-thick) solid var(--color-primary);
}

.page-articles .obs-next__sub {
  margin: 0;
  font-size: var(--text-base);
}

.page-articles .obs-next__item--primary .obs-next__sub a,
.page-articles .obs-next__item--primary .obs-next__text a {
  color: var(--color-contrast-accent);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-articles .obs-next__foot {
  margin: var(--space-6) 0 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 焦点环 ---------- */
.page-articles :focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-articles .obs-hero__inner {
    grid-template-columns: minmax(0, 1fr) 152px;
    column-gap: var(--space-6);
    row-gap: var(--space-6);
    padding-top: var(--section-y-lg);
  }

  .page-articles .obs-hero__lead {
    grid-column: 1;
    grid-row: 1;
  }

  .page-articles .obs-roundindex {
    grid-column: 2;
    grid-row: 1 / span 2;
  }

  .page-articles .obs-roundindex__list {
    flex-direction: column;
    gap: var(--space-1);
  }

  .page-articles .obs-roundindex__link {
    text-align: center;
  }

  .page-articles .obs-hero__figures {
    grid-column: 1;
    grid-row: 2;
  }

  .page-articles .obs-body__grid {
    grid-template-columns: 168px minmax(0, 1fr);
    column-gap: var(--space-8);
  }

  .page-articles .obs-timeline {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-articles .obs-timeline__list {
    position: relative;
    flex-direction: column;
    gap: 0;
    padding: 0 0 0 var(--space-4);
    overflow: visible;
  }

  .page-articles .obs-timeline__list::before {
    content: "";
    position: absolute;
    left: 4px;
    top: var(--space-2);
    bottom: var(--space-2);
    width: var(--border-thin);
    background-color: var(--color-line);
  }

  .page-articles .obs-timeline__link::before {
    content: "";
    position: absolute;
    top: 50%;
    left: calc(-1 * var(--space-4) + 1px);
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--color-ink-muted);
    transform: translateY(-50%);
    transition: background-color 120ms cubic-bezier(0.2, 0, 0.2, 1),
                width 120ms cubic-bezier(0.2, 0, 0.2, 1),
                height 120ms cubic-bezier(0.2, 0, 0.2, 1);
  }

  .page-articles .obs-timeline__link.is-current::before {
    width: 14px;
    height: 14px;
    left: calc(-1 * var(--space-4) - 2px);
    background-color: var(--color-primary);
  }

  .page-articles .obs-next__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--space-8);
  }

  .page-articles .obs-next__item--second {
    padding-top: var(--space-6);
  }
}

@media (min-width: 1100px) {
  .page-articles .obs-hero__inner {
    grid-template-columns: minmax(0, 1fr) 168px;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-articles .obs-ticker__track {
    animation: none;
  }

  .page-articles .obs-timeline__link::before {
    transition: none;
  }

  .page-articles .obs-item__head {
    transition: none;
  }
}
<<<END>>>