.page-articles {
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-articles .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  padding-block: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.page-articles .breadcrumb a {
  color: var(--color-ink-soft);
  text-decoration: none;
}

.page-articles .breadcrumb a:hover,
.page-articles .breadcrumb a:focus-visible {
  color: var(--color-primary);
}

.page-articles .breadcrumb a[aria-current="page"] {
  color: var(--color-ink);
  font-weight: 700;
}

.page-articles .breadcrumb__sep {
  color: var(--color-line);
}

/* ---------- 首屏 ---------- */
.page-articles .art-hero {
  margin-bottom: var(--section-y);
}

.page-articles .art-hero__visual {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: clamp(300px, 54vw, 540px);
  overflow: hidden;
  background: var(--color-contrast-surface);
}

.page-articles .art-hero__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

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

.page-articles .art-hero__copy {
  position: relative;
  z-index: 1;
  color: var(--color-contrast-ink);
  padding-block: var(--space-8) var(--space-6);
}

.page-articles .art-hero__title {
  margin: var(--space-3) 0 0;
  max-width: 15ch;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-display);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}

.page-articles .art-hero__lede {
  margin: var(--space-4) 0 0;
  max-width: 48ch;
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 84%, transparent);
}

/* 数字条 */
.page-articles .art-hero__figures {
  background: var(--color-contrast-surface);
  border-top: var(--border-thick) solid var(--color-contrast-line);
}

.page-articles .art-hero__figures-inner {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4) var(--space-3);
  padding-block: var(--space-6);
}

.page-articles .art-figure {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  min-width: 0;
}

.page-articles .art-figure__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--text-figure);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-contrast-accent);
}

.page-articles .art-figure__label {
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 76%, transparent);
}

/* ---------- 条目流 ---------- */
.page-articles .art-stream {
  padding-bottom: var(--section-y-lg);
}

.page-articles .art-block-head {
  max-width: var(--measure);
  margin-bottom: var(--space-8);
}

.page-articles .art-block-head__note {
  margin: var(--space-3) 0 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-articles .art-feed {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-articles .art-entry {
  max-width: 82ch;
  padding-block: var(--space-4);
}

.page-articles .art-entry__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin: 0;
}

.page-articles .art-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-pill);
  background: var(--color-surface-alt);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-ink);
  text-decoration: none;
}

.page-articles .art-tag::before {
  content: "";
  flex: 0 0 auto;
  width: var(--space-1);
  height: var(--space-1);
}

.page-articles .art-tag:hover,
.page-articles .art-tag:focus-visible {
  background: var(--color-surface-deep);
}

.page-articles .art-tag--advance::before {
  border-radius: 50%;
  background: var(--color-primary);
}

.page-articles .art-tag--report::before {
  background: var(--color-contrast-surface);
}

.page-articles .art-tag--rules::before {
  border-radius: 50% 50% 0 0;
  background: var(--color-accent);
}

.page-articles .art-tag--history::before {
  width: calc(var(--space-1) / 2);
  height: calc(var(--space-1) + var(--space-1) / 2);
  transform: rotate(22deg);
  background: var(--color-primary);
}

.page-articles .art-tag--method::before {
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
  background: var(--color-accent);
}

.page-articles .art-entry__num {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-ink-muted);
}

.page-articles .art-entry__when {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
}

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

.page-articles .art-entry__title a {
  color: var(--color-ink);
  text-decoration: none;
}

.page-articles .art-entry__title a:hover {
  color: var(--color-primary);
}

.page-articles .art-entry__title a:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 4px;
}

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

.page-articles .art-entry__desc strong {
  font-weight: 700;
  color: var(--color-ink);
}

.page-articles .art-entry--breath .art-entry__title {
  font-size: var(--text-xl);
  max-width: 26ch;
}

.page-articles .art-entry--breath .art-entry__desc {
  font-size: var(--text-base);
  color: var(--color-ink-soft);
}

/* ---------- 分类区块 ---------- */
.page-articles .art-cat {
  position: relative;
  isolation: isolate;
  scroll-margin-top: var(--space-8);
}

.page-articles .art-cat--advance {
  background: var(--color-surface-alt);
}

.page-articles .art-cat--rules {
  background: var(--color-highlight);
}

.page-articles .art-cat--history {
  background: var(--color-surface);
}

.page-articles .art-cat--method {
  background: var(--color-surface-alt);
}

.page-articles .art-cat--report {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-articles .art-cat__bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-articles .art-cat--report::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--overlay-scrim);
}

.page-articles .art-cat__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.page-articles .art-cat__body .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.page-articles .art-cat__mark {
  display: inline-block;
  flex: 0 0 auto;
  width: var(--space-3);
  height: var(--space-3);
}

.page-articles .art-cat__mark--circle {
  border-radius: 50%;
  background: var(--color-primary);
}

.page-articles .art-cat__mark--square {
  background: var(--color-contrast-accent);
}

.page-articles .art-cat__mark--half {
  border-radius: 50% 50% 0 0;
  background: var(--color-accent);
}

.page-articles .art-cat__mark--wedge {
  clip-path: polygon(0 0, 100% 0, 0 100%);
  background: var(--color-primary);
}

.page-articles .art-cat__mark--bar {
  width: var(--space-1);
  height: var(--space-6);
  transform: skewX(-18deg);
  background: var(--color-accent);
}

.page-articles .art-cat .section-title {
  margin: var(--space-3) 0 0;
  color: inherit;
}

.page-articles .art-cat .prose {
  margin: var(--space-4) 0 0;
  max-width: var(--measure);
  color: inherit;
  opacity: 0.88;
}

.page-articles .art-cat__list {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
  max-width: var(--measure);
}

.page-articles .art-cat__list li {
  display: grid;
  gap: var(--space-1);
}

.page-articles .art-cat__list a {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-base);
  line-height: var(--leading-heading);
  text-decoration: none;
  color: inherit;
}

.page-articles .art-cat__list a::after {
  content: " →";
  font-family: var(--font-mono);
  font-weight: 400;
  opacity: 0.5;
}

.page-articles .art-cat__list a:hover {
  color: var(--color-primary);
}

.page-articles .art-cat__list a:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 3px;
}

.page-articles .art-cat__list span {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.02em;
  opacity: 0.72;
}

.page-articles .art-cat__figure {
  margin: 0;
}

.page-articles .art-cat__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 桌面 ---------- */
@media (min-width: 720px) {
  .page-articles .art-hero__figures-inner {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--space-6) var(--space-4);
  }
}

@media (min-width: 960px) {
  .page-articles .art-entry {
    padding-block: var(--space-6);
  }

  .page-articles .art-cat__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    gap: var(--space-8);
    align-items: start;
  }

  .page-articles .art-cat__grid--flip {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  }

  .page-articles .art-cat__grid:not(:has(.art-cat__figure)) {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-articles .art-cat__figure {
    padding-top: var(--space-4);
  }
}
<<<END>>>