.page-about {
  --about-node: 13px;
  --about-rail-pad: clamp(20px, 3vw, 36px);
  --about-pad: clamp(18px, 2.6vw, 30px);
  --about-rule: 1px solid var(--ink-700);
  --about-rule-soft: 1px solid rgba(242, 245, 243, .07);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin: 0 0 clamp(24px, 3.6vw, 48px);
}

/* ---------- 网格与列位（移动端优先：全部整行） ---------- */
.page-about .about-hero__grid,
.page-about .about-identity__grid,
.page-about .about-phases__grid,
.page-about .about-team__grid,
.page-about .about-system__grid,
.page-about .about-scale__grid,
.page-about .about-partners__grid,
.page-about .about-promise__grid {
  gap: clamp(22px, 3vw, 44px);
}

.page-about .about-hero__grid > *,
.page-about .about-identity__grid > *,
.page-about .about-phases__grid > *,
.page-about .about-team__grid > *,
.page-about .about-system__grid > *,
.page-about .about-scale__grid > *,
.page-about .about-partners__grid > *,
.page-about .about-promise__grid > * {
  grid-column: 1 / -1;
  min-width: 0;
}

/* ---------- 通用文字 ---------- */
.page-about .about-hero__text,
.page-about .about-team__text,
.page-about .about-partners__text,
.page-about .about-cta__text {
  font-size: clamp(16px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--chalk);
  margin: 0 0 16px;
  max-width: 64ch;
}

.page-about .about-rail-note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  margin: 14px 0 0;
  max-width: 30ch;
}

.page-about .about-link {
  color: var(--volt);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 102, 255, .38);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--neon);
  border-bottom-color: var(--neon);
  outline: none;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-bottom: clamp(42px, 6vw, 86px);
}

.page-about .about-hero__rail {
  border-top: var(--about-rule);
  padding-top: 12px;
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 clamp(14px, 3vw, 28px);
}

.page-about .about-toc__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
  text-decoration: none;
  border-bottom: var(--about-rule-soft);
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--chalk);
  transform: translateY(-2px);
  outline: none;
}

.page-about .about-toc__link:focus-visible {
  box-shadow: 0 0 0 2px var(--volt);
}

.page-about .about-toc__no {
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--neon);
}

.page-about .about-hero__kicker {
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--neon);
  margin: 0 0 clamp(14px, 2vw, 22px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(34px, 7vw, 62px);
  line-height: 1.04;
  letter-spacing: -.02em;
  color: var(--chalk);
  margin: 0 0 clamp(18px, 2.4vw, 28px);
}

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

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

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ---------- 章节节奏 ---------- */
.page-about .about-identity,
.page-about .about-team,
.page-about .about-system,
.page-about .about-partners,
.page-about .about-promise {
  padding: clamp(46px, 6.4vw, 92px) 0;
}

.page-about .about-phases,
.page-about .about-scale {
  padding: clamp(40px, 5.6vw, 78px) 0;
  border-top: var(--about-rule);
  border-bottom: var(--about-rule);
  background:
    linear-gradient(115deg, rgba(0, 168, 107, .08), rgba(11, 13, 14, 0) 58%),
    var(--ink-850);
}

.page-about .about-identity {
  padding-top: clamp(28px, 4vw, 56px);
}

/* ---------- 01 我们做什么 ---------- */
.page-about .claim-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .claim {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: clamp(12px, 2vw, 24px);
  padding: clamp(18px, 2.4vw, 28px) 0;
  border-top: var(--about-rule);
  transition: transform var(--dur) var(--ease);
}

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

.page-about .claim:hover {
  transform: translateY(-2px);
}

.page-about .claim__no {
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--neon);
  margin: 4px 0 0;
}

.page-about .claim__title {
  font-family: var(--font-display);
  font-size: clamp(19px, 2.2vw, 23px);
  line-height: 1.25;
  letter-spacing: -.01em;
  color: var(--chalk);
  margin: 0 0 8px;
}

.page-about .claim__text {
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
  max-width: 62ch;
}

/* ---------- 02 能力演进带 ---------- */
.page-about .phase-rail {
  --rail-pad: var(--about-rail-pad);
  list-style: none;
  margin: 0;
  padding: 0 0 0 var(--rail-pad);
  border-left: 1px solid var(--ink-700);
}

.page-about .phase {
  position: relative;
  padding-bottom: clamp(24px, 3.6vw, 40px);
}

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

.page-about .phase__node {
  position: absolute;
  top: 7px;
  left: calc(-1 * var(--rail-pad) - 7px);
  width: var(--about-node);
  height: var(--about-node);
  background: var(--neon);
  transition: transform var(--dur) var(--ease);
}

.page-about .phase:hover .phase__node {
  transform: scale(1.28);
}

.page-about .phase__no {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--turf);
  margin: 0 0 6px;
}

.page-about .phase__title {
  font-family: var(--font-display);
  font-size: clamp(18px, 2.1vw, 22px);
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--chalk);
  margin: 0 0 8px;
}

.page-about .phase__text {
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
  max-width: 62ch;
}

/* ---------- 03 团队 ---------- */
.page-about .about-team__figure {
  margin: 0;
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-team__main .section__title {
  margin-top: 10px;
}

.page-about .about-team__text--tail {
  margin-top: 22px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 15px;
}

.page-about .team-bars {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.2vw, 22px);
}

.page-about .team-bar {
  padding-bottom: clamp(14px, 2vw, 18px);
  border-bottom: var(--about-rule-soft);
}

.page-about .team-bar__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.page-about .team-bar__name {
  font-size: 15px;
  color: var(--chalk);
}

.page-about .team-bar__value {
  font-size: 15px;
  color: var(--muted);
  transition: color var(--dur) var(--ease);
}

.page-about .team-bar:hover .team-bar__value {
  color: var(--neon);
}

.page-about .team-bar__track {
  height: 8px;
  background: var(--ink-700);
  overflow: hidden;
}

.page-about .team-bar__fill {
  display: block;
  height: 100%;
  background: var(--turf);
  transition: width var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .team-bar:hover .team-bar__fill {
  background: var(--neon);
}

.page-about .team-bar__fill--edit { width: 31%; }
.page-about .team-bar__fill--build { width: 35%; }
.page-about .team-bar__fill--watch { width: 34%; }

.page-about .team-bar__role {
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  margin: 10px 0 0;
  max-width: 56ch;
}

/* ---------- 04 内容体系 ---------- */
.page-about .system-index {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .system-index__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 6px clamp(12px, 2vw, 24px);
  padding: clamp(18px, 2.4vw, 26px) 0;
  border-top: var(--about-rule);
  transition: transform var(--dur) var(--ease);
}

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

.page-about .system-index__item:hover {
  transform: translateY(-2px);
}

.page-about .system-index__no {
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--neon);
  margin: 3px 0 0;
}

.page-about .system-index__title {
  font-family: var(--font-display);
  font-size: clamp(18px, 2.1vw, 22px);
  line-height: 1.3;
  color: var(--chalk);
  margin: 0 0 8px;
}

.page-about .system-index__text {
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
  max-width: 62ch;
}

.page-about .system-index__meta {
  grid-column: 2 / 3;
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--turf);
  margin: 10px 0 0;
}

.page-about .about-system__tail {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  margin: clamp(22px, 3vw, 32px) 0 0;
}

/* ---------- 05 覆盖规模 ---------- */
.page-about .scale-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ink-700);
  border: var(--about-rule);
}

.page-about .scale-figure {
  background: var(--ink-800);
  padding: var(--about-pad);
  transition: background var(--dur) var(--ease);
}

.page-about .scale-figure:hover {
  background: var(--ink-850);
}

.page-about .scale-figure__num {
  font-size: clamp(30px, 4.4vw, 46px);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--neon);
  margin: 0 0 10px;
}

.page-about .scale-figure__tail {
  font-size: .54em;
  margin-left: 2px;
}

.page-about .scale-figure__unit {
  font-size: 13px;
  color: var(--chalk);
  margin: 0 0 8px;
}

.page-about .scale-figure__note {
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
  margin: 0;
}

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

.page-about .about-scale__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 4;
  object-fit: cover;
}

/* ---------- 06 协作与迭代 ---------- */
.page-about .about-partners__text:last-child {
  margin-bottom: 0;
}

.page-about .about-quote {
  align-self: start;
  background: var(--neon-soft);
  border: 1px solid var(--neon);
  padding: var(--about-pad);
}

.page-about .about-quote__text {
  font-size: clamp(16px, 1.9vw, 20px);
  line-height: 1.55;
  font-weight: 600;
  color: var(--ink-900);
  margin: 0 0 14px;
}

.page-about .about-quote__meta {
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: rgba(11, 13, 14, .62);
  margin: 0;
}

/* ---------- 07 服务承诺 ---------- */
.page-about .promise-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .promise {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: clamp(18px, 2.4vw, 26px) 0;
  border-top: var(--about-rule);
  transition: transform var(--dur) var(--ease);
}

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

.page-about .promise:hover {
  transform: translateY(-2px);
}

.page-about .promise__no {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--neon);
  margin: 0;
}

.page-about .promise__title {
  font-family: var(--font-display);
  font-size: clamp(18px, 2.1vw, 21px);
  line-height: 1.3;
  color: var(--chalk);
  margin: 0;
}

.page-about .promise__text {
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
  max-width: 64ch;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(26px, 3.6vw, 40px);
  padding-top: clamp(22px, 3vw, 32px);
  border-top: var(--about-rule);
}

.page-about .about-cta__text {
  margin-bottom: clamp(16px, 2.2vw, 22px);
  color: var(--muted);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-toc__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .scale-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .system-index__item {
    grid-template-columns: 40px minmax(0, 1fr) 130px;
    align-items: start;
  }

  .page-about .system-index__meta {
    grid-column: 3 / 4;
    text-align: right;
    margin-top: 6px;
  }

  .page-about .promise {
    grid-template-columns: 52px minmax(130px, 190px) minmax(0, 1fr);
    gap: clamp(14px, 2vw, 26px);
    align-items: baseline;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__rail {
    grid-column: 1 / 3;
  }

  .page-about .about-hero__lede {
    grid-column: 3 / 8;
  }

  .page-about .about-hero__figure {
    grid-column: 8 / 13;
    align-self: start;
  }

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

  .page-about .about-identity__head,
  .page-about .about-phases__head,
  .page-about .about-system__head,
  .page-about .about-scale__head,
  .page-about .about-promise__head {
    grid-column: 1 / 4;
  }

  .page-about .claim-list {
    grid-column: 4 / 13;
  }

  .page-about .phase-rail {
    grid-column: 4 / 12;
  }

  .page-about .about-team__figure {
    grid-column: 1 / 6;
  }

  .page-about .about-team__main {
    grid-column: 6 / 13;
  }

  .page-about .system-index {
    grid-column: 4 / 13;
  }

  .page-about .about-system__tail {
    grid-column: 4 / 12;
  }

  .page-about .scale-figures {
    grid-column: 4 / 13;
  }

  .page-about .about-scale__figure {
    grid-column: 1 / 13;
  }

  .page-about .about-partners__main {
    grid-column: 1 / 9;
  }

  .page-about .about-quote {
    grid-column: 9 / 13;
  }

  .page-about .promise-list {
    grid-column: 4 / 13;
  }

  .page-about .about-cta {
    grid-column: 4 / 13;
  }
}

@media (min-width: 1280px) {
  .page-about .about-hero__lede {
    grid-column: 3 / 8;
  }

  .page-about .about-hero__figure {
    grid-column: 8 / 13;
  }

  .page-about .phase-rail {
    grid-column: 4 / 11;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .claim,
  .page-about .claim__body,
  .page-about .about-toc__link,
  .page-about .system-index__item,
  .page-about .promise,
  .page-about .phase__node,
  .page-about .team-bar__fill,
  .page-about .team-bar__value,
  .page-about .scale-figure {
    transition: none;
  }

  .page-about .claim:hover,
  .page-about .system-index__item:hover,
  .page-about .promise:hover,
  .page-about .phase:hover .phase__node,
  .page-about .about-toc__link:hover,
  .page-about .about-toc__link:focus-visible {
    transform: none;
  }
}