.page-about {
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-block: var(--space-3) 0;
}
.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.page-about .breadcrumb-list li {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}
.page-about .breadcrumb-list li + li::before {
  content: "";
  width: 20px;
  height: 0;
  border-top: var(--border-thin) dotted var(--color-line);
}
.page-about .breadcrumb-list a {
  color: var(--color-ink-soft);
  text-decoration: none;
}
.page-about .breadcrumb-list a:hover,
.page-about .breadcrumb-list a:focus-visible {
  color: var(--color-primary);
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */
.page-about .about-intro {
  position: relative;
  overflow: hidden;
  padding-block: var(--section-y) var(--section-y-lg);
  background: var(--color-surface);
}
.page-about .about-intro-grid {
  align-items: start;
  gap: var(--space-6) var(--space-4);
}
.page-about .about-h1 {
  margin: var(--space-2) 0 var(--space-3);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-4xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-surface);
}
.page-about .about-intro-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin: var(--space-4) 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-intro-figure {
  margin: 0;
  position: relative;
  z-index: 1;
}
.page-about .about-intro-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: var(--border-thick) solid var(--color-contrast-surface);
  box-shadow: var(--shadow-2);
  filter: saturate(0.7) contrast(1.06) brightness(0.96);
}
.page-about .about-figure-caption {
  margin: var(--space-2) 0 0;
  max-width: 44ch;
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}
.page-about .about-shard {
  position: absolute;
  pointer-events: none;
  z-index: 0;
}
.page-about .about-shard--wedge {
  inset-block-start: calc(var(--space-2) * -1);
  inset-inline-end: calc(var(--space-6) * -1);
  width: 240px;
  height: 170px;
  background: var(--color-primary-soft);
  clip-path: polygon(0 0, 100% 24%, 78% 100%, 0 66%);
}
.page-about .about-shard--dots {
  inset-block-end: var(--space-6);
  inset-inline-start: calc(var(--space-8) * -1);
  width: 180px;
  height: 96px;
  background-image: radial-gradient(var(--color-line) 2px, transparent 2px);
  background-size: 14px 14px;
  opacity: 0.9;
}

/* ---------- 出发点 ---------- */
.page-about .about-why {
  background: var(--color-surface-alt);
  padding-block: var(--section-y);
}
.page-about .about-why-head {
  max-width: var(--measure);
}
.page-about .about-why-list {
  counter-reset: why;
  list-style: none;
  margin: var(--space-8) 0 0;
  padding: 0;
}
.page-about .about-why-item {
  counter-increment: why;
  position: relative;
  padding: var(--space-4) 0 var(--space-4) var(--space-6);
  border-top: var(--border-thin) dotted var(--color-line);
}
.page-about .about-why-item:last-child {
  border-bottom: var(--border-thin) dotted var(--color-line);
}
.page-about .about-why-item::before {
  content: counter(why, decimal-leading-zero);
  position: absolute;
  inset-inline-start: 0;
  inset-block-start: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.04em;
  color: var(--color-primary);
}
.page-about .about-why-title {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-contrast-surface);
}
.page-about .about-why-text {
  margin: 0;
  max-width: var(--measure);
  color: var(--color-ink-soft);
}

/* ---------- 团队与更新机制 ---------- */
.page-about .about-crew {
  background: var(--color-highlight);
  padding-block: var(--section-y-lg) var(--section-y);
}
.page-about .about-crew-grid {
  align-items: start;
  gap: var(--space-6) var(--space-4);
}
.page-about .about-crew-figure {
  margin: 0;
}
.page-about .about-crew-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: var(--border-thin) solid var(--color-contrast-surface);
  filter: saturate(0.68) contrast(1.05);
}
.page-about .about-crew-facts {
  margin: var(--space-4) 0 0;
  padding: 0;
  border-top: var(--border-thin) dashed var(--color-ink-soft);
}
.page-about .about-crew-fact {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-1) var(--space-2);
  padding-block: var(--space-2);
  border-bottom: var(--border-thin) dashed var(--color-line);
}
.page-about .about-crew-fact dt {
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
}
.page-about .about-crew-fact dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  color: var(--color-accent);
}
.page-about .about-note {
  display: inline-block;
  margin: var(--space-4) 0 0;
  padding: var(--space-1) var(--space-3);
  border: var(--border-thin) dashed var(--color-ink-soft);
  border-radius: var(--radius-pill);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-soft);
  background: color-mix(in srgb, var(--color-surface) 72%, transparent);
}
.page-about .about-cadence {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: var(--border-thin) dotted var(--color-ink-soft);
}
.page-about .about-cadence-title {
  margin: 0 0 var(--space-4);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  color: var(--color-contrast-surface);
}
.page-about .about-cadence-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-cadence-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-1);
  padding-block: var(--space-3);
  border-bottom: var(--border-thin) dotted var(--color-line);
}
.page-about .about-cadence-key {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
  color: var(--color-contrast-surface);
}
.page-about .about-cadence-val {
  color: var(--color-ink-soft);
}

/* ---------- 深色数字带 ---------- */
.page-about .about-stats {
  position: relative;
  overflow: hidden;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding-block: var(--section-y-lg);
}
.page-about .about-stats::after {
  content: "";
  position: absolute;
  inset-block-start: -42%;
  inset-inline-end: -12%;
  width: 340px;
  height: 340px;
  background: var(--color-contrast-accent);
  opacity: 0.07;
  transform: rotate(24deg);
  pointer-events: none;
}
.page-about .about-stats-head {
  position: relative;
  z-index: 1;
}
.page-about .about-stats .kicker {
  color: var(--color-contrast-accent);
}
.page-about .about-stats-title {
  margin: var(--space-2) 0 0;
  max-width: 22ch;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-3xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}
.page-about .about-stats-grid {
  position: relative;
  z-index: 1;
  margin-top: var(--space-8);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: var(--border-thin) dashed var(--color-contrast-line);
}
.page-about .about-stat {
  padding-block: var(--space-4);
  border-bottom: var(--border-thin) dashed var(--color-contrast-line);
}
.page-about .about-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: var(--weight-heading);
  font-size: var(--text-figure);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-contrast-accent);
}
.page-about .about-stat-unit {
  margin-inline-start: 0.18em;
  font-size: var(--text-xl);
  color: var(--color-contrast-ink);
}
.page-about .about-stat-label {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline-section {
  background: var(--color-surface);
  padding-block: var(--section-y-lg);
}
.page-about .about-timeline-head {
  max-width: var(--measure);
}
.page-about .about-timeline-grid {
  margin-top: var(--space-8);
  align-items: start;
  gap: var(--space-6) var(--space-4);
}
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 var(--space-6);
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  inset-block: 0;
  inset-inline-start: var(--space-2);
  width: 0;
  border-inline-start: var(--border-thin) dashed var(--color-line);
}
.page-about .about-timeline-item {
  position: relative;
  padding-block: var(--space-4);
}
.page-about .about-timeline-item + .about-timeline-item {
  border-top: var(--border-thin) dotted var(--color-line);
}
.page-about .about-timeline-marker {
  position: absolute;
  inset-inline-start: calc(var(--space-2) - var(--space-6));
  inset-block-start: calc(var(--space-4) + var(--space-1));
  width: var(--space-2);
  height: var(--space-2);
  border-radius: var(--radius-pill);
  background: var(--color-primary);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--color-primary) 22%, transparent);
  z-index: 1;
}
.page-about .about-timeline-era {
  margin: 0 0 var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-primary);
}
.page-about .about-timeline-title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-contrast-surface);
}
.page-about .about-timeline-text {
  margin: 0;
  max-width: 62ch;
  color: var(--color-ink-soft);
}
.page-about .about-timeline-aside {
  margin: 0;
}
.page-about .about-timeline-aside img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: var(--border-thin) solid var(--color-contrast-surface);
  filter: saturate(0.6) contrast(1.05) brightness(0.95);
}

/* ---------- 原则与边界 ---------- */
.page-about .about-principles {
  background: var(--color-primary-soft);
  padding-block: var(--section-y-lg);
}
.page-about .about-principles-head {
  max-width: var(--measure);
}
.page-about .about-principles-list {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
}
.page-about .about-principle {
  padding-block: var(--space-4);
  border-top: var(--border-thin) dashed color-mix(in srgb, var(--color-primary) 45%, transparent);
}
.page-about .about-principle:last-child {
  border-bottom: var(--border-thin) dashed color-mix(in srgb, var(--color-primary) 45%, transparent);
}
.page-about .about-principle-title {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-contrast-surface);
}
.page-about .about-principle-title::before {
  content: "";
  display: inline-block;
  width: var(--space-2);
  height: var(--space-2);
  margin-inline-end: var(--space-2);
  border-radius: var(--radius-pill);
  background: var(--color-primary);
  vertical-align: middle;
}
.page-about .about-principle-text {
  margin: 0;
  max-width: var(--measure);
  color: var(--color-ink);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  background: var(--color-surface-deep);
  padding-block: var(--section-y-lg);
}
.page-about .about-next-inner {
  max-width: var(--measure);
}
.page-about .about-next-title {
  margin: var(--space-2) 0 var(--space-3);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-3xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-surface);
}
.page-about .about-next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-6);
}
.page-about .about-next-fine {
  margin: var(--space-4) 0 0;
  font-size: var(--text-xs);
  line-height: 1.9;
  letter-spacing: 0.04em;
  color: var(--color-ink-soft);
}
.page-about .about-next-fine a {
  color: var(--color-ink-soft);
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 3px;
}
.page-about .about-next-fine a:hover,
.page-about .about-next-fine a:focus-visible {
  color: var(--color-primary);
}

/* ---------- 响应式 ---------- */
@media (max-width: 767px) {
  .page-about .grid-9 {
    grid-template-columns: minmax(0, 1fr);
  }
  .page-about .grid-9 > [class*="span-"] {
    grid-column: 1 / -1;
  }
  .page-about .about-shard--wedge {
    width: 160px;
    height: 120px;
  }
  .page-about .about-shard--dots {
    display: none;
  }
}

@media (min-width: 768px) {
  .page-about .about-cadence-item {
    grid-template-columns: minmax(150px, 220px) minmax(0, 1fr);
    gap: var(--space-2) var(--space-4);
    align-items: baseline;
  }
  .page-about .about-stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: var(--space-4);
  }
  .page-about .about-principle {
    display: grid;
    grid-template-columns: minmax(170px, 250px) minmax(0, 1fr);
    gap: var(--space-1) var(--space-4);
    align-items: baseline;
  }
  .page-about .about-principle-title {
    margin: 0;
  }
}

@media (min-width: 1024px) {
  .page-about .about-intro-grid {
    align-items: center;
  }
  .page-about .about-intro-figure {
    transform: rotate(-1deg);
  }
  .page-about .about-stats-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-timeline-grid {
    align-items: start;
  }
  .page-about .about-timeline-aside {
    margin-top: var(--space-8);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-intro-figure {
    transform: none;
  }
}