.page-about {
  --about-rail: 208px;
  --about-trait-gap: clamp(10px, 1.4vw, 16px);
  background: var(--snow);
  color: var(--ink);
  font-family: var(--font-display);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--blue);
  color: var(--snow);
  padding-bottom: clamp(58px, 9vw, 104px);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.page-about .about-hero__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.42;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(104deg, rgba(7, 26, 32, 0.94) 0%, rgba(11, 59, 77, 0.86) 46%, rgba(11, 59, 77, 0.48) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  left: -2%;
  right: -2%;
  bottom: 0;
  height: clamp(26px, 4.4vw, 48px);
  background: var(--snow);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  z-index: 2;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  padding-top: clamp(94px, 12vw, 144px);
}

.page-about .about-crumb,
.page-about .about-crumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-crumb,
.page-about .about-crumb a {
  color: var(--snow-a72);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-decoration: none;
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--snow);
  text-decoration: underline;
}

.page-about .about-crumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--snow-a55);
}

.page-about .about-hero__eyebrow {
  margin: clamp(22px, 3vw, 34px) 0 0;
  color: var(--lime);
}

.page-about .about-hero__title {
  margin: clamp(10px, 1.6vw, 18px) 0 0;
  color: var(--snow);
  font-size: clamp(2.2rem, 6.6vw, 4.4rem);
  line-height: 1.02;
  letter-spacing: -0.04em;
  font-weight: 300;
  max-width: 20ch;
}

.page-about .about-hero__lede {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  max-width: 56ch;
  color: var(--snow-a82);
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(14px, 2vw, 22px);
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: clamp(16px, 2.4vw, 24px) 0 0;
  border-top: 2px solid var(--snow-a16);
}

.page-about .hero-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.55rem, 3.4vw, 2.3rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime);
}

.page-about .hero-stat__num--alt {
  color: var(--cyan);
}

.page-about .hero-stat__plus,
.page-about .hero-stat__unit {
  font-size: 0.6em;
  margin-left: 2px;
  vertical-align: super;
}

.page-about .hero-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--snow-a55);
}

/* ---------- 非对称双栏 ---------- */
.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 56px);
  padding-block: clamp(36px, 5.5vw, 76px) clamp(8px, 2vw, 24px);
}

.page-about .about-rail {
  position: relative;
}

.page-about .rail-heading {
  margin: 0 0 12px;
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 2px solid var(--frost);
}

.page-about .rail-link {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 10px 0 10px 14px;
  margin-left: -2px;
  border-left: 2px solid transparent;
  color: var(--rock);
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--ink);
  border-left-color: var(--orange);
}

.page-about .rail-num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--blue);
}

.page-about .rail-cta {
  margin-top: clamp(16px, 2.4vw, 24px);
}

/* ---------- 章节 ---------- */
.page-about .chapter {
  scroll-margin-top: 104px;
  padding-block: clamp(26px, 4vw, 46px);
}

.page-about .chapter:first-child {
  padding-top: 0;
}

.page-about .chapter + .chapter {
  border-top: 2px solid var(--frost);
}

.page-about .chapter-head {
  position: relative;
  padding-top: clamp(14px, 2vw, 20px);
  border-top: 2px solid var(--ink);
}

.page-about .chapter-head::after {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: clamp(56px, 12vw, 112px);
  height: 8px;
  background: linear-gradient(90deg, var(--orange), var(--lime));
  transform: skewX(-18deg);
  transform-origin: left bottom;
}

.page-about .chapter-head .display-2 {
  margin: clamp(10px, 1.6vw, 16px) 0 0;
  font-size: clamp(1.6rem, 4.4vw, 2.7rem);
  line-height: 1.12;
  letter-spacing: -0.03em;
  font-weight: 400;
  max-width: 22ch;
}

.page-about .chapter-copy {
  margin-top: clamp(14px, 2.2vw, 22px);
}

.page-about .chapter-copy .lede {
  margin: 0 0 14px;
}

.page-about .chapter .lede {
  max-width: 62ch;
  margin: clamp(14px, 2.2vw, 22px) 0 0;
  color: var(--rock);
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  line-height: 1.75;
}

.page-about .chapter p {
  max-width: 66ch;
  line-height: 1.75;
  font-size: clamp(0.98rem, 1.35vw, 1.05rem);
}

.page-about .chapter-note {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding-left: 14px;
  border-left: 3px solid var(--blue);
  font-size: 14px;
  line-height: 1.7;
  color: var(--rock);
}

/* ---------- 特质小卡 ---------- */
.page-about .trait-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-trait-gap);
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .trait {
  position: relative;
  background: var(--sand);
  border: 2px solid var(--ink);
  box-shadow: var(--hard-sm);
  padding: clamp(16px, 2.2vw, 24px);
}

.page-about .trait::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 5px;
  background: linear-gradient(90deg, var(--blue), var(--cyan) 55%, var(--orange));
}

.page-about .trait-key {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--blue);
}

.page-about .trait .heading-3 {
  margin: 8px 0 0;
  font-size: clamp(1.05rem, 2vw, 1.25rem);
}

.page-about .trait p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--rock);
}

/* ---------- 数据与编辑时序 ---------- */
.page-about .flow-list {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  border-top: 2px solid var(--frost);
}

.page-about .flow-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding-block: clamp(16px, 2.4vw, 22px);
  border-bottom: 2px solid var(--frost);
}

.page-about .flow-mark {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--orange);
  padding: 3px 9px;
  background: var(--sand);
  border: 1px solid var(--frost);
  align-self: start;
  justify-self: start;
  white-space: nowrap;
}

.page-about .flow-body .heading-3 {
  margin: 0;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
}

.page-about .flow-body p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--rock);
}

/* ---------- 团队 ---------- */
.page-about .about-figure {
  margin: clamp(20px, 3vw, 32px) 0 0;
  border: 2px solid var(--ink);
  box-shadow: var(--hard);
  background: var(--frost);
}

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

.page-about .about-figure .media__caption {
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--rock);
  background: var(--snow);
  padding: 10px 14px;
  border-top: 2px solid var(--ink);
}

.page-about .team-panels {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-trait-gap);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .team-card {
  position: relative;
  background: var(--sand);
  border: 2px solid var(--ink);
  box-shadow: var(--hard-sm);
  padding: clamp(16px, 2.2vw, 24px);
  transition: transform var(--t) var(--ease), box-shadow var(--t) var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus,
.page-about .team-card:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 var(--blue);
  outline: none;
}

.page-about .team-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3.2vw, 2.2rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--blue);
}

.page-about .team-card .heading-3 {
  margin: 10px 0 0;
  font-size: clamp(1rem, 1.8vw, 1.15rem);
}

.page-about .team-card__role {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.68;
  color: var(--rock);
}

/* ---------- 历程时间线 ---------- */
.page-about .timeline {
  position: relative;
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--blue), var(--cyan) 55%, var(--orange));
}

.page-about .tl-item {
  position: relative;
  padding-left: 34px;
  padding-block: clamp(10px, 1.6vw, 14px);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--snow);
  border: 2px solid var(--blue);
}

.page-about .tl-item:last-child::before {
  background: var(--orange);
  border-color: var(--ink);
}

.page-about .tl-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--blue);
  background: var(--frost);
  padding: 3px 9px;
}

.page-about .tl-body .heading-3 {
  margin: 10px 0 0;
  font-size: clamp(1rem, 1.9vw, 1.2rem);
}

.page-about .tl-body p {
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--rock);
}

/* ---------- 合作生态 ---------- */
.page-about .eco-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-trait-gap);
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .eco-cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(16px, 2.2vw, 24px);
  background: var(--sand);
  border: 2px solid var(--ink);
}

.page-about .eco-cell--blue {
  background: var(--blue);
  border-color: var(--ink);
}

.page-about .eco-cell--orange {
  background: var(--frost);
}

.page-about .eco-cell--line {
  background: var(--snow);
  box-shadow: var(--hard-sm);
}

.page-about .eco-num {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3.4vw, 2.3rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .eco-cell--blue .eco-num {
  color: var(--lime);
}

.page-about .eco-cell--orange .eco-num {
  color: var(--orange);
}

.page-about .eco-num--text {
  font-size: clamp(1.1rem, 2.2vw, 1.4rem);
  letter-spacing: 0.04em;
}

.page-about .eco-label {
  font-size: 14px;
  line-height: 1.65;
  color: var(--rock);
}

.page-about .eco-cell--blue .eco-label {
  color: var(--snow-a82);
}

/* ---------- 收尾 ---------- */
.page-about .about-outro {
  position: relative;
  margin-top: clamp(30px, 5vw, 62px);
  background: var(--ink);
  color: var(--snow);
  padding-block: clamp(38px, 6vw, 76px);
}

.page-about .about-outro::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--cyan), var(--lime) 52%, var(--orange));
}

.page-about .about-outro__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 40px);
  align-items: end;
}

.page-about .about-outro .index-label {
  color: var(--lime);
}

.page-about .about-outro .display-2 {
  margin: clamp(10px, 1.6vw, 16px) 0 0;
  font-size: clamp(1.55rem, 4vw, 2.5rem);
  line-height: 1.14;
  letter-spacing: -0.03em;
  font-weight: 400;
  color: var(--snow);
  max-width: 20ch;
}

.page-about .about-outro__copy p {
  margin: 14px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--snow-a72);
}

.page-about .about-outro__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-outro .btn--ghost {
  color: var(--snow);
  border-color: var(--snow-a55);
  background: transparent;
  box-shadow: none;
}

.page-about .about-outro .btn--ghost:hover,
.page-about .about-outro .btn--ghost:focus-visible {
  color: var(--ink);
  background: var(--snow);
  border-color: var(--snow);
}

/* ---------- 断点 ---------- */
@media (min-width: 560px) {
  .page-about .flow-item {
    grid-template-columns: minmax(96px, 120px) minmax(0, 1fr);
    gap: 18px;
    align-items: start;
  }

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

@media (min-width: 720px) {
  .page-about .trait-grid,
  .page-about .team-panels {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-outro__inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  }

  .page-about .about-outro__links {
    justify-content: flex-end;
  }
}

@media (min-width: 900px) {
  .page-about .about-grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(34px, 4.6vw, 68px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
    align-self: start;
  }
}

@media (hover: hover) and (min-width: 720px) {
  .page-about .team-card::after {
    content: "+";
    position: absolute;
    top: 12px;
    right: 14px;
    font-family: var(--font-mono);
    font-size: 15px;
    line-height: 1;
    color: var(--rock);
    transition: transform var(--t) var(--ease), color var(--t) var(--ease);
  }

  .page-about .team-card:hover::after,
  .page-about .team-card:focus::after {
    content: "+";
    transform: rotate(45deg);
    color: var(--orange);
  }

  .page-about .team-card__role {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    transition: max-height var(--t) var(--ease), opacity var(--t) var(--ease), margin-top var(--t) var(--ease);
  }

  .page-about .team-card:hover .team-card__role,
  .page-about .team-card:focus .team-card__role,
  .page-about .team-card:focus-within .team-card__role {
    max-height: 220px;
    opacity: 1;
    margin-top: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .rail-link,
  .page-about .team-card,
  .page-about .team-card::after,
  .page-about .team-card__role {
    transition: none;
  }

  .page-about .team-card:hover,
  .page-about .team-card:focus,
  .page-about .team-card:focus-visible {
    transform: none;
  }
}