.page-about {
  --about-rail-line: 1.5px solid var(--c-glacier-deep);
  --about-rule: 1.5px solid var(--c-terra);
  --about-sticky-top: 128px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(1.25rem, 3vw, 2rem) clamp(3rem, 7vw, 5.5rem);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  margin-top: clamp(2rem, 5vw, 3.5rem);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: end;
    gap: clamp(2.5rem, 6vw, 5rem);
  }
}

.page-about .about-hero__title {
  font-family: var(--f-display);
  font-size: clamp(2.25rem, 5.4vw, 4rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--c-channel-deep);
  margin: var(--space-3) 0 var(--space-4);
}

.page-about .about-hero__lede {
  max-width: 34em;
  color: var(--c-rock);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

.page-about .about-hero__aside {
  display: grid;
  gap: var(--space-4);
  padding: clamp(1.25rem, 3vw, 2rem);
  border: var(--stroke);
  border-radius: var(--r-glass);
  background:
    linear-gradient(158deg, rgba(207, 224, 230, 0.62) 0%, rgba(250, 246, 239, 0.92) 62%);
  box-shadow: var(--shadow-soft);
}

.page-about .about-hero__art {
  width: 100%;
  height: auto;
  display: block;
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
  margin: 0;
  padding-top: var(--space-3);
  border-top: 1.5px solid rgba(156, 188, 201, 0.6);
}

.page-about .about-figures__item {
  min-width: 0;
}

.page-about .about-figures__label {
  font-family: var(--f-body);
  font-size: var(--fs-small);
  color: var(--c-rock-soft);
  line-height: 1.4;
  margin-bottom: var(--space-1);
}

.page-about .about-figures__value {
  margin: 0;
  font-family: var(--f-mono);
  font-size: clamp(1.5rem, 3.2vw, 2.125rem);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--c-channel-deep);
}

.page-about .about-figures__unit {
  font-size: 0.52em;
  margin-left: 0.15em;
  color: var(--c-rock-soft);
}

/* ---------- 三件事 ---------- */
.page-about .about-h2 {
  font-family: var(--f-display);
  font-size: var(--fs-h2);
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--c-channel-deep);
}

.page-about .about-pillars-section .section__head {
  max-width: 46rem;
}

.page-about .about-pillars {
  list-style: none;
  margin: clamp(2.5rem, 5vw, 4rem) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-pillar {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-4);
  padding: clamp(1.5rem, 3vw, 2.25rem) 0;
  border-top: var(--about-rule);
}

.page-about .about-pillar:last-child {
  border-bottom: var(--about-rule);
}

@media (min-width: 760px) {
  .page-about .about-pillar {
    grid-template-columns: 8rem minmax(0, 1fr);
    gap: var(--space-5);
  }
}

.page-about .about-pillar__index {
  font-family: var(--f-mono);
  font-size: clamp(2rem, 4.6vw, 3.5rem);
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--c-glacier-deep);
}

.page-about .about-pillar__title {
  font-family: var(--f-display);
  font-size: var(--fs-h3);
  color: var(--c-channel-deep);
  margin-bottom: var(--space-2);
}

.page-about .about-pillar__body p {
  max-width: 44rem;
  color: var(--c-rock);
  line-height: 1.75;
}

/* ---------- 发展脉络 ---------- */
.page-about .about-timeline {
  position: relative;
  overflow: hidden;
}

.page-about .about-timeline__texture {
  position: absolute;
  inset: 0 0 auto 0;
  height: 100%;
  pointer-events: none;
  opacity: 0.32;
  z-index: 0;
}

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

.page-about .about-timeline .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-timeline .section__head {
  max-width: 46rem;
}

.page-about .about-timeline__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
  margin-top: clamp(2.5rem, 5vw, 4rem);
}

@media (min-width: 960px) {
  .page-about .about-timeline__grid {
    grid-template-columns: 32% minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4.5rem);
    align-items: start;
  }
}

.page-about .about-timeline__rail {
  border-left: var(--about-rail-line);
  padding-left: var(--space-4);
}

@media (min-width: 960px) {
  .page-about .about-timeline__rail {
    position: sticky;
    top: var(--about-sticky-top);
  }
}

.page-about .about-rail__caption {
  font-family: var(--f-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-rock-soft);
  margin-bottom: var(--space-3);
}

.page-about .about-rail {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-1);
}

@media (max-width: 959px) {
  .page-about .about-rail {
    grid-auto-flow: column;
    grid-auto-columns: minmax(9rem, 1fr);
    overflow-x: auto;
    padding-bottom: var(--space-2);
    scrollbar-width: thin;
  }
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  padding: var(--space-2) 0;
  color: var(--c-rock-soft);
  text-decoration: none;
  border-bottom: 1.5px solid transparent;
  transition: color 220ms var(--ease), border-color 220ms var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--c-channel);
  border-bottom-color: var(--c-channel);
}

.page-about .about-rail__year {
  font-family: var(--f-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.06em;
  color: var(--c-terra);
}

.page-about .about-rail__name {
  font-size: var(--fs-small);
  font-weight: 600;
}

.page-about .about-timeline__body {
  display: grid;
  gap: 0;
}

.page-about .about-stage {
  padding-block: clamp(1.5rem, 3.5vw, 2.75rem);
  border-top: var(--about-rule);
  scroll-margin-top: 140px;
}

.page-about .about-stage:first-child {
  border-top-color: transparent;
  padding-top: 0;
}

@media (min-width: 960px) {
  .page-about .about-stage:first-child {
    padding-top: var(--space-2);
  }
}

.page-about .about-stage__year {
  font-family: var(--f-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.08em;
  color: var(--c-terra);
  margin-bottom: var(--space-2);
}

.page-about .about-stage__title {
  font-family: var(--f-display);
  font-size: var(--fs-h3);
  line-height: 1.25;
  color: var(--c-channel-deep);
  margin-bottom: var(--space-3);
}

.page-about .about-stage > p {
  max-width: 44rem;
  color: var(--c-rock);
  line-height: 1.75;
}

.page-about .about-stage__list {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
}

.page-about .about-stage__list li {
  position: relative;
  padding-left: 1.35rem;
  font-size: var(--fs-small);
  color: var(--c-rock-soft);
  line-height: 1.65;
}

.page-about .about-stage__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 0.5rem;
  height: 1.5px;
  background: var(--c-terra);
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

@media (min-width: 940px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }
}

.page-about .about-team__body .lede {
  max-width: 40rem;
  margin-top: var(--space-3);
}

.page-about .about-roles {
  list-style: none;
  margin: clamp(2rem, 4vw, 3rem) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-5);
}

@media (min-width: 620px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-5) var(--space-5);
  }
}

.page-about .about-role {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1.5px solid rgba(156, 188, 201, 0.7);
}

.page-about .about-role__num {
  font-family: var(--f-mono);
  font-size: clamp(2rem, 4vw, 3.25rem);
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--c-channel);
}

.page-about .about-role__title {
  font-family: var(--f-display);
  font-size: 1.0625rem;
  color: var(--c-channel-deep);
  margin-bottom: var(--space-1);
}

.page-about .about-role p {
  font-size: var(--fs-small);
  color: var(--c-rock-soft);
  line-height: 1.7;
  max-width: 24rem;
}

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

.page-about .about-team__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--r-card);
  border: var(--stroke);
  object-fit: cover;
}

.page-about .about-team__cap {
  margin-top: var(--space-2);
  font-family: var(--f-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.06em;
  color: var(--c-rock-soft);
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-reach__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

@media (min-width: 940px) {
  .page-about .about-reach__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
  }
}

.page-about .about-reach__body .lede {
  max-width: 38rem;
  margin-top: var(--space-3);
}

.page-about .about-reach__list {
  list-style: none;
  margin: clamp(1.75rem, 3.5vw, 2.5rem) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.page-about .about-reach__list li {
  padding-left: var(--space-4);
  border-left: 1.5px solid var(--c-glacier-deep);
  font-size: var(--fs-small);
  line-height: 1.7;
  color: var(--c-rock);
}

.page-about .about-reach__list strong {
  color: var(--c-channel-deep);
  font-weight: 600;
}

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

.page-about .about-reach__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--r-card);
  object-fit: cover;
}

.page-about .about-reach__cap {
  margin-top: var(--space-2);
  font-family: var(--f-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.06em;
  color: var(--c-rock-soft);
}

/* ---------- 内容与合作 ---------- */
.page-about .about-quality .section__head {
  max-width: 46rem;
}

.page-about .about-quality__grid {
  margin-top: clamp(2.5rem, 5vw, 3.5rem);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
}

@media (min-width: 700px) {
  .page-about .about-quality__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-quality__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-quality__card {
  border-top: 1.5px solid var(--c-terra);
  border-radius: 0 0 var(--r-card) var(--r-card);
  padding-top: var(--space-4);
}

.page-about .about-quality__card .panel__title {
  font-family: var(--f-display);
  font-size: 1.0625rem;
  line-height: 1.35;
  color: var(--c-channel-deep);
}

.page-about .about-quality__card .panel__meta {
  font-family: var(--f-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.05em;
  color: var(--c-rock-soft);
  line-height: 1.6;
}

.page-about .about-quality__card .panel__body p {
  font-size: var(--fs-small);
  color: var(--c-rock);
  line-height: 1.72;
}

/* ---------- 后续路径 ---------- */
.page-about .about-next {
  padding-block: clamp(2.5rem, 5vw, 4rem) var(--sect);
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
  margin-top: clamp(2rem, 4vw, 3rem);
}

@media (min-width: 860px) {
  .page-about .about-next__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: clamp(2.5rem, 6vw, 5rem);
    align-items: start;
  }
}

.page-about .about-next__lead p {
  max-width: 30rem;
  margin: var(--space-3) 0 var(--space-5);
  color: var(--c-rock-soft);
  line-height: 1.75;
}

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

.page-about .about-next__links li {
  border-top: 1.5px solid rgba(156, 188, 201, 0.7);
}

.page-about .about-next__links li:last-child {
  border-bottom: 1.5px solid rgba(156, 188, 201, 0.7);
}

.page-about .about-next__links .link-arrow {
  display: block;
  padding: var(--space-4) 0;
  font-size: var(--fs-small);
  line-height: 1.6;
  color: var(--c-channel-deep);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link {
    transition: none;
  }
}
</main>