.page-about {
  color: var(--color-ink);
  font-family: var(--font-body);
  line-height: var(--leading-body);
}

/* ---------- 开篇 ---------- */
.page-about .about-open {
  padding-top: 0;
}

.page-about .about-open__media {
  position: relative;
  isolation: isolate;
  display: flex;
  align-items: flex-end;
  min-height: 72vh;
  overflow: hidden;
  background: var(--color-contrast-surface);
}

.page-about .about-open__media .media-block__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 58%;
}

.page-about .about-open__media .media-block__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
}

.page-about .about-open__body {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--space-8) var(--space-3) var(--space-6);
  color: var(--color-contrast-ink);
}

.page-about .about-open__crumb {
  color: var(--color-contrast-ink);
  margin-bottom: var(--space-4);
}

.page-about .about-open__crumb .link-plain,
.page-about .about-open__crumb span {
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  text-decoration: none;
}

.page-about .about-open__crumb .link-plain {
  opacity: 0.78;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.page-about .about-open__sep {
  opacity: 0.5;
}

.page-about .about-open__eyebrow {
  color: var(--color-contrast-accent);
}

.page-about .about-open__title {
  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);
  margin: var(--space-2) 0 var(--space-3);
  max-width: 18ch;
}

.page-about .about-open__lede {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
}

/* ---------- 规模数字带 ---------- */
.page-about .about-figures__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3) var(--space-2);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-about .about-figures__item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.page-about .about-figures .stat__value {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--color-accent);
}

.page-about .about-figures .stat__label {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  line-height: 1.4;
}

/* ---------- 核心陈述 ---------- */
.page-about .about-claim__text {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  line-height: 1.5;
  letter-spacing: var(--tracking-heading);
  color: var(--color-primary);
  max-width: 34ch;
}

.page-about .about-claim__quote .quote__source {
  color: var(--color-ink-muted);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  margin-top: var(--space-2);
}

/* ---------- 页内目录条 ---------- */
.page-about .about-anchors {
  margin-top: var(--space-4);
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-about .about-anchors__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1) var(--space-3);
  padding: var(--space-2) 0;
}

.page-about .about-anchors__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.page-about .about-anchors__link {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: var(--border-thin) solid transparent;
  transition: color 160ms var(--ease-out), border-color 160ms var(--ease-out);
}

.page-about .about-anchors__link:hover,
.page-about .about-anchors__link:focus-visible {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* ---------- 定位与边界 ---------- */
.page-about .about-position__title,
.page-about .about-journey__title,
.page-about .about-mech__title,
.page-about .about-team__title,
.page-about .about-principles__title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-2xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  margin: var(--space-2) 0 var(--space-3);
  max-width: 26ch;
}

.page-about .about-position__num,
.page-about .about-journey__num,
.page-about .about-mech__num,
.page-about .about-team__num,
.page-about .about-principles__num {
  color: var(--color-ink-muted);
}

.page-about .about-position__cols {
  display: grid;
  gap: var(--space-4);
}

.page-about .about-position__body p {
  margin: 0 0 var(--space-3);
}

.page-about .about-position__body p:last-child {
  margin-bottom: 0;
}

.page-about .about-position__negative {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
}

.page-about .about-position__negative li {
  position: relative;
  padding-left: var(--space-3);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink);
}

.page-about .about-position__negative li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: var(--space-2);
  height: var(--border-thin);
  background: var(--color-accent);
}

/* ---------- 发展历程：横向赛季轴 ---------- */
.page-about .about-journey__lede,
.page-about .about-mech__lede,
.page-about .about-team__lede,
.page-about .about-next__lede {
  margin: 0 0 var(--space-6);
  max-width: var(--measure);
  font-size: var(--text-base);
  color: var(--color-ink-soft);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-timeline__stage {
  position: relative;
  padding: var(--space-3) 0 var(--space-4) var(--space-4);
  border-left: var(--border-thin) solid var(--color-line);
}

.page-about .about-timeline__stage:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__dot {
  position: absolute;
  top: 0;
  left: calc(-1 * var(--space-1) / 2);
  width: var(--space-1);
  height: var(--space-1);
  border-radius: var(--radius-pill);
  background: var(--color-line);
  transition: background 160ms var(--ease-out), transform 160ms var(--ease-out);
}

.page-about .about-timeline__stage:hover .about-timeline__dot,
.page-about .about-timeline__stage:focus-within .about-timeline__dot {
  background: var(--color-accent);
  transform: scale(1.35);
}

.page-about .about-timeline__years {
  color: var(--color-ink-muted);
  margin: 0 0 var(--space-1);
}

.page-about .about-timeline__name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  margin: 0 0 var(--space-2);
}

.page-about .about-timeline__desc {
  margin: 0 0 var(--space-2);
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.page-about .about-timeline__tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  opacity: 0.55;
  transition: opacity 160ms var(--ease-out);
}

.page-about .about-timeline__stage:hover .about-timeline__tags,
.page-about .about-timeline__stage:focus-within .about-timeline__tags {
  opacity: 1;
}

@media (hover: none) {
  .page-about .about-timeline__tags {
    opacity: 1;
  }
}

/* ---------- 机制 ---------- */
.page-about .about-mech__grid {
  display: grid;
  gap: var(--space-4);
}

.page-about .about-mech__figure {
  margin: 0;
  border-radius: var(--radius-lg);
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-contrast-surface);
  overflow: hidden;
}

.page-about .about-mech__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-mech__panel-title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  margin: 0 0 var(--space-2);
}

.page-about .about-mech__panel p {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.page-about .about-mech__check {
  display: grid;
  gap: var(--space-2);
  margin-top: var(--space-6);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-about .about-mech__check-num {
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--color-accent);
}

.page-about .about-mech__check-text {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: var(--space-4);
}

.page-about .about-team__figure {
  margin: 0;
  border-radius: var(--radius-lg);
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-primary-soft);
  overflow: hidden;
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-team__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-about .about-team__item:last-child {
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-about .about-team__num-value {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--color-primary);
}

.page-about .about-team__item-name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  margin: 0 0 var(--space-1);
}

.page-about .about-team__item-body p {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

/* ---------- 运营原则 ---------- */
.page-about .about-principles__list {
  list-style: none;
  counter-reset: principle;
  margin: 0;
  padding: 0;
}

.page-about .about-principles__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-about .about-principles__item:last-child {
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-about .about-principles__item::before {
  counter-increment: principle;
  content: counter(principle, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  line-height: 1.9;
}

.page-about .about-principles__item-name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  margin: 0 0 var(--space-1);
}

.page-about .about-principles__item p {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

/* ---------- 深色入口条 ---------- */
.page-about .about-next {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-about .about-next__title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-2xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
  margin: 0 0 var(--space-3);
}

.page-about .about-next__lede {
  color: var(--color-contrast-ink);
  opacity: 0.72;
}

.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-next__item {
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-about .about-next__item:last-child {
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.page-about .about-next__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-1) var(--space-3);
  align-items: baseline;
  padding: var(--space-3) 0;
  text-decoration: none;
  color: var(--color-contrast-ink);
}

.page-about .about-next__num {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-contrast-accent);
}

.page-about .about-next__name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  letter-spacing: var(--tracking-heading);
  transition: color 160ms var(--ease-out);
}

.page-about .about-next__desc {
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-contrast-ink);
  opacity: 0.72;
  max-width: var(--measure);
}

.page-about .about-next__link:hover .about-next__name,
.page-about .about-next__link:focus-visible .about-next__name {
  color: var(--color-contrast-accent);
}

.page-about :focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .about-figures__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-4) var(--space-3);
  }

  .page-about .about-mech__check {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: baseline;
    gap: var(--space-4);
  }
}

@media (min-width: 768px) {
  .page-about .about-open__body {
    padding: var(--space-8) var(--space-4) var(--space-6);
  }

  .page-about .about-open__title {
    font-size: var(--text-4xl);
    max-width: 16ch;
  }

  .page-about .about-open__lede {
    font-size: var(--text-lg);
  }

  .page-about .about-position__title,
  .page-about .about-journey__title,
  .page-about .about-mech__title,
  .page-about .about-team__title,
  .page-about .about-principles__title {
    font-size: var(--text-3xl);
  }
}

@media (min-width: 900px) {
  .page-about .about-position__cols {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: var(--gutter);
    align-items: start;
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--gutter);
  }

  .page-about .about-timeline__stage {
    border-left: 0;
    border-top: var(--border-thin) solid var(--color-line);
    padding: var(--space-4) 0 0;
  }

  .page-about .about-timeline__stage:last-child {
    padding-bottom: 0;
  }

  .page-about .about-timeline__dot {
    top: calc(-1 * var(--space-1) / 2);
    left: 0;
  }

  .page-about .about-mech__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.3fr);
    gap: var(--gutter);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: var(--gutter);
    align-items: start;
  }

  .page-about .about-next__link {
    grid-template-columns: auto minmax(0, 0.8fr) minmax(0, 1.2fr);
    align-items: baseline;
  }

  .page-about .about-next__num {
    grid-row: auto;
  }
}

@media (min-width: 1024px) {
  .page-about .about-open__media {
    min-height: 76vh;
  }

  .page-about .about-anchors {
    position: sticky;
    top: var(--topbar-h);
    z-index: 3;
    background: color-mix(in srgb, var(--color-surface) 88%, transparent);
    backdrop-filter: blur(8px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__dot,
  .page-about .about-timeline__tags,
  .page-about .about-anchors__link,
  .page-about .about-next__name {
    transition: none;
  }
}
<<<END>>>