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

.page-about .prose {
  max-width: var(--measure);
  font-size: var(--text-base);
}

.page-about .prose p + p {
  margin-top: var(--space-3);
}

.page-about .prose a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .media {
  margin: 0;
}

.page-about .media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  object-fit: cover;
  filter: brightness(0.78) contrast(1.08) saturate(0.92);
}

.page-about .media__caption {
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

/* ---------- 首屏 ---------- */

.page-about .about-intro__grid {
  margin-top: var(--space-6);
}

.page-about .about-intro__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);
  margin-top: var(--space-3);
  max-width: 24ch;
}

.page-about .about-intro__lede {
  margin-top: var(--space-3);
  font-size: var(--text-lg);
  line-height: 1.5;
  color: var(--color-ink-soft);
  max-width: 46ch;
}

.page-about .about-intro__facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  margin-top: var(--space-6);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-about .about-intro__facts > div {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
}

.page-about .about-intro__facts dt {
  flex: 0 0 4em;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.page-about .about-intro__facts dd {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  color: var(--color-ink);
}

/* ---------- 起步叙事 ---------- */

.page-about .about-origin__grid {
  display: grid;
  gap: var(--space-6);
}

.page-about .about-origin__text .section-title {
  margin: var(--space-2) 0 var(--space-4);
}

.page-about .about-origin__media {
  order: -1;
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: var(--space-8) 0 0;
  padding: 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 8px;
  bottom: 8px;
  width: 7px;
  background: var(--color-primary);
}

.page-about .about-timeline__node {
  position: relative;
  padding: var(--space-3) var(--space-3) var(--space-3) var(--space-6);
  border-bottom: var(--border-thin) solid var(--color-line);
  transition: background-color 150ms ease, color 150ms ease;
}

.page-about .about-timeline__node::before {
  content: "";
  position: absolute;
  left: 0;
  top: var(--space-4);
  width: 11px;
  height: 11px;
  background: var(--color-primary);
  transition: background-color 150ms ease;
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-1);
}

.page-about .about-timeline__body h3 {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 700;
  margin-bottom: var(--space-1);
}

.page-about .about-timeline__body p {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

@media (hover: hover) {
  .page-about .about-timeline__node:hover {
    background: var(--color-primary);
    color: var(--color-primary-ink);
  }

  .page-about .about-timeline__node:hover::before {
    background: var(--color-primary-ink);
  }

  .page-about .about-timeline__node:hover .about-timeline__body p {
    color: color-mix(in srgb, var(--color-primary-ink) 82%, transparent);
  }
}

/* ---------- 口径说明（主色带） ---------- */

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

.page-about .band--primary .section-title,
.page-about .band--primary .eyebrow__text,
.page-about .band--primary .eyebrow__num {
  color: var(--color-primary-ink);
}

.page-about .about-quote {
  margin: 0;
  padding-left: var(--space-3);
  border-left: 8px solid var(--color-primary-ink);
}

.page-about .about-quote p {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 600;
  line-height: 1.45;
  color: var(--color-primary-ink);
  max-width: 42ch;
}

.page-about .about-why__prose {
  color: var(--color-primary-ink);
}

.page-about .about-why__prose a {
  color: var(--color-primary-ink);
  text-decoration-color: color-mix(in srgb, var(--color-primary-ink) 55%, transparent);
}

/* ---------- 质检（深色带） ---------- */

.page-about .about-proof__grid {
  display: grid;
  gap: var(--space-6);
}

.page-about .about-proof__media {
  order: -1;
}

.page-about .about-proof__list,
.page-about .about-proof__steps {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-proof__steps {
  margin-top: var(--space-6);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-about .about-proof__steps li {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  font-size: var(--text-base);
  color: var(--color-contrast-ink);
}

.page-about .about-proof__idx {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-contrast-accent);
  letter-spacing: 0.04em;
}

.page-about .about-proof .media__caption {
  color: color-mix(in srgb, var(--color-contrast-ink) 65%, transparent);
}

/* ---------- 规模数字 ---------- */

.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  margin-top: var(--space-8);
}

.page-about .about-scale__item {
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-about .about-scale__value {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--color-primary);
}

.page-about .about-scale__item h3 {
  margin: var(--space-2) 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 700;
  line-height: 1.2;
}

.page-about .about-scale__item p {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  max-width: 34ch;
}

/* ---------- 职能组 ---------- */

.page-about .about-team__media {
  margin-bottom: var(--space-6);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
  margin-top: var(--space-6);
}

.page-about .about-team__grid .fold {
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
}

.page-about .about-team__grid .fold__head {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  text-align: left;
}

.page-about .about-team__index {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.page-about .about-team__name {
  flex: 1 1 auto;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 700;
}

.page-about .about-team__grid .fold__body p {
  max-width: 52ch;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.page-about .about-team__grid .fold__body p + p {
  margin-top: var(--space-2);
}

.page-about .about-team__grid .fold__body a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 行动出口 ---------- */

.page-about .about-action__grid {
  display: grid;
  gap: var(--space-6);
}

.page-about .about-action__text {
  margin-top: var(--space-3);
  max-width: 40ch;
  font-size: var(--text-lg);
  line-height: 1.5;
  color: var(--color-contrast-ink);
}

.page-about .about-action__contact {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  align-items: flex-start;
  padding: var(--space-4);
  border: var(--border-thin) solid var(--color-contrast-line);
}

.page-about .about-action__channel {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  color: var(--color-contrast-ink);
  word-break: break-word;
}

.page-about .about-action__channel strong {
  margin-right: var(--space-2);
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--color-contrast-accent);
}

.page-about .about-action__note {
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent);
}

.page-about .about-action__buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-1);
}

.page-about .about-action .btn--primary {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  border-color: var(--color-primary);
}

.page-about .about-action .btn--primary:hover {
  background: var(--color-primary-ink);
  color: var(--color-primary);
  border-color: var(--color-primary-ink);
}

.page-about .about-action .btn--outline {
  background: transparent;
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
}

.page-about .about-action .btn--outline:hover {
  background: var(--color-contrast-ink);
  color: var(--color-contrast-surface);
  border-color: var(--color-contrast-ink);
}

/* ---------- 断点 ---------- */

@media (min-width: 720px) {
  .page-about .about-intro__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-4);
  }

  .page-about .about-intro__facts > div {
    display: block;
  }

  .page-about .about-intro__facts dt {
    display: block;
    margin-bottom: var(--space-1);
  }

  .page-about .about-scale__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-3);
  }

  .page-about .about-action__grid {
    grid-template-columns: 3fr 2fr;
    align-items: start;
    gap: var(--space-8);
  }
}

@media (min-width: 900px) {
  .page-about .about-intro__grid {
    display: grid;
    grid-template-columns: repeat(8, minmax(0, 1fr));
    column-gap: var(--gutter);
  }

  .page-about .about-intro__grid > .eyebrow {
    grid-column: 1 / -1;
  }

  .page-about .about-intro__title {
    grid-column: 1 / span 5;
    font-size: var(--text-2xl);
  }

  .page-about .about-intro__lede {
    grid-column: 6 / span 3;
    margin-top: var(--space-6);
  }

  .page-about .about-intro__facts {
    grid-column: 1 / -1;
  }

  .page-about .about-origin__grid {
    grid-template-columns: 5fr 3fr;
    gap: var(--space-8);
    align-items: start;
  }

  .page-about .about-origin__media {
    order: 0;
  }

  .page-about .about-why__grid {
    grid-template-columns: 5fr 3fr;
    grid-template-areas:
      "head head"
      "quote quote"
      "prose prose";
    gap: var(--space-4);
  }

  .page-about .about-why__head {
    grid-area: head;
  }

  .page-about .about-quote {
    grid-area: quote;
  }

  .page-about .about-why__prose {
    grid-area: prose;
  }

  .page-about .about-proof__grid {
    grid-template-columns: 4fr 5fr;
    gap: var(--space-8);
    align-items: start;
  }

  .page-about .about-proof__media {
    order: 0;
  }

  .page-about .about-scale__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-6) var(--space-4);
  }

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

  .page-about .about-timeline__node {
    display: grid;
    grid-template-columns: 8ch 1fr;
    column-gap: var(--space-4);
    align-items: baseline;
  }

  .page-about .about-timeline__year {
    margin-bottom: 0;
  }
}

@media (min-width: 1100px) {
  .page-about .about-scale__item:nth-child(3n) {
    padding-right: var(--space-3);
  }
}
</main>