.page-about {
  --about-sticky-top: calc(var(--topbar-h) + 32px);
  background: var(--offside-white);
  color: var(--ink);
  overflow-x: hidden;
  scroll-behavior: smooth;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding-top: 30px;
  padding-bottom: 10px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-mute);
}
.page-about .breadcrumb a {
  color: var(--ink-mute);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--turf-deep);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-bottom: clamp(48px, 7vw, 96px);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 380px;
  background: repeating-linear-gradient(
    90deg,
    rgba(20, 104, 60, 0.05) 0 44px,
    rgba(20, 104, 60, 0) 44px 88px
  );
  pointer-events: none;
}
.page-about .about-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 60px);
  align-items: end;
}

.page-about .about-hero__title {
  margin: 18px 0 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(32px, 7.2vw, 68px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  max-width: 16em;
}
.page-about .about-hero__lead .lead {
  margin-top: 22px;
}
.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}
.page-about .about-hero__stat {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line-grey);
  background: rgba(255, 255, 255, 0.72);
  font-size: 13px;
  color: var(--ink-soft);
}
.page-about .about-hero__stat .mono {
  font-size: 15px;
  font-weight: 700;
  color: var(--turf-deep);
}

.page-about .scale-visual {
  position: relative;
  overflow: hidden;
  background: var(--board-navy);
  border-radius: var(--radius-card);
  padding: clamp(24px, 4vw, 36px);
  color: var(--offside-white);
}
.page-about .scale-visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.07) 1px, transparent 1px);
  background-size: 34px 34px;
  pointer-events: none;
}
.page-about .scale-visual__caption {
  position: relative;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--turf-bright);
}
.page-about .scale-visual__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .scale-visual__item {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 16px;
  align-items: center;
  padding: 12px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
  transition: background var(--t-base) var(--ease);
}
.page-about .scale-visual__item:first-child {
  border-top: 0;
}
.page-about .scale-visual__item:hover {
  background: rgba(255, 210, 74, 0.08);
}
.page-about .scale-visual__year {
  font-size: 16px;
  font-weight: 700;
  color: var(--whistle);
}
.page-about .scale-visual__label {
  font-size: 14px;
  line-height: 1.5;
  color: rgba(251, 250, 245, 0.86);
}

/* ---------- 章节头微调 ---------- */
.page-about .section-head__num {
  transition: color 500ms var(--ease);
}
.page-about .section-head__num[data-reveal="pending"] {
  color: var(--line-grey);
}
.page-about .section-head__num[data-reveal="in"] {
  color: var(--ink);
}
.page-about [data-reveal="pending"] {
  opacity: 0.2;
}
.page-about [data-reveal] {
  transition: opacity 500ms var(--ease), color 500ms var(--ease);
}

/* ---------- 01 起点 ---------- */
.page-about .about-origin {
  padding: clamp(48px, 7vw, 88px) 0;
  border-top: 1px solid var(--line-grey);
}
.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 56px);
  align-items: start;
}
.page-about .about-origin__text p {
  max-width: 40ch;
  margin: 18px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}
.page-about .about-origin__text a {
  color: var(--turf-deep);
  text-decoration: none;
  border-bottom: 2px solid var(--whistle);
  transition: background var(--t-fast) var(--ease);
}
.page-about .about-origin__text a:hover {
  background: var(--whistle);
}
.page-about .about-origin__figure {
  border-radius: var(--radius-card);
  overflow: hidden;
}

/* ---------- 02 升级节点 ---------- */
.page-about .about-node {
  padding: clamp(48px, 7vw, 88px) 0;
  background: linear-gradient(180deg, rgba(46, 158, 96, 0.06), rgba(46, 158, 96, 0));
}
.page-about .about-node__grid {
  display: block;
  margin-top: 40px;
}
.page-about .about-index {
  display: none;
}
.page-about .about-node__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .node-card {
  border-radius: var(--radius-card);
  border: 1px solid var(--line-grey);
  background: #ffffff;
  padding: clamp(18px, 2.6vw, 28px);
  margin-bottom: 16px;
  scroll-margin-top: calc(var(--topbar-h) + 28px);
  transition: border-color var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease);
}
.page-about .node-card:nth-child(even) {
  background: var(--whistle-soft);
  border-color: transparent;
}
.page-about .node-card:hover {
  border-color: var(--turf-bright);
  box-shadow: var(--shadow-card);
}
.page-about .node-card summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 6px 18px;
  align-items: baseline;
  cursor: pointer;
  list-style: none;
}
.page-about .node-card summary::-webkit-details-marker {
  display: none;
}
.page-about .node-card summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--turf-deep);
  transition: transform var(--t-fast) var(--ease);
}
.page-about .node-card details[open] > summary::after {
  content: "−";
}
.page-about .node-card summary:focus-visible {
  outline: 2px solid var(--whistle);
  outline-offset: 4px;
  border-radius: var(--radius-md);
}
.page-about .node-card__year {
  grid-row: span 2;
  font-size: 20px;
  font-weight: 700;
  color: var(--board-navy);
  letter-spacing: 0.02em;
}
.page-about .node-card__head {
  display: contents;
}
.page-about .node-card__title {
  display: block;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}
.page-about .node-card__line {
  display: block;
  grid-column: 2;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-mute);
}
.page-about .node-card__fields {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 18px 0 0;
  padding: 16px 0 0 0;
  border-top: 1px dashed var(--line-grey);
}
.page-about .node-card__fields li {
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background: var(--board-navy);
  color: var(--offside-white);
  font-size: 13px;
  line-height: 1.5;
}

/* ---------- 03 工序 ---------- */
.page-about .about-flow {
  padding: clamp(48px, 7vw, 88px) 0;
}
.page-about .about-flow__lead {
  margin-top: 20px;
  max-width: 46ch;
  color: var(--ink-soft);
}
.page-about .about-flow__chart {
  margin: 36px 0 0;
}
.page-about .about-flow__svg {
  display: block;
  width: 100%;
  height: auto;
}
.page-about .about-flow__axis {
  stroke: #C9D2CC;
  stroke-width: 2;
  stroke-dasharray: 6 8;
}
.page-about .about-flow__poly {
  fill: none;
  stroke: #2E9E60;
  stroke-width: 3;
  stroke-linejoin: round;
  stroke-linecap: round;
}
.page-about .about-flow__dot {
  fill: #FFD24A;
  stroke: #0E2A47;
  stroke-width: 3;
  transition: fill var(--t-fast) var(--ease);
}
.page-about .about-flow__dot:hover {
  fill: #D93A34;
}

.page-about .about-flow__list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}
.page-about .flow-step {
  border-radius: var(--radius-md);
  border: 1px solid var(--line-grey);
  background: #ffffff;
  padding: 18px 18px 20px;
  transition: border-color var(--t-base) var(--ease), transform var(--t-base) var(--ease);
}
.page-about .flow-step:hover {
  border-color: var(--turf-bright);
  transform: translateY(-2px);
}
.page-about .flow-step__num {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--turf-bright);
}
.page-about .flow-step__title {
  margin: 8px 0 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}
.page-about .flow-step__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}
.page-about .flow-step__meta {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--whistle-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--board-navy);
}

/* ---------- 04 团队 ---------- */
.page-about .about-team {
  padding: clamp(48px, 7vw, 88px) 0;
  background: rgba(20, 104, 60, 0.05);
}
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  margin-top: 38px;
  align-items: start;
}
.page-about .about-team__figure {
  border-radius: var(--radius-card);
  overflow: hidden;
}
.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}
.page-about .team-item {
  padding: 20px 0;
  border-top: 1px solid var(--line-grey);
}
.page-about .team-item:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .team-item__num {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--whistle);
  background: var(--board-navy);
  border-radius: var(--radius-pill);
  padding: 3px 10px;
}
.page-about .team-item__title {
  margin: 10px 0 0;
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}
.page-about .team-item__text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 42ch;
}

/* ---------- 05 使命 ---------- */
.page-about .about-mission {
  position: relative;
  overflow: hidden;
  background: var(--board-navy);
  color: var(--offside-white);
  padding: clamp(56px, 8vw, 104px) 0;
}
.page-about .about-mission__bg {
  position: absolute;
  inset: 0;
}
.page-about .about-mission__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.2;
  display: block;
}
.page-about .about-mission__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, rgba(14, 42, 71, 0.95) 20%, rgba(20, 104, 60, 0.78) 100%);
}
.page-about .about-mission__inner {
  position: relative;
}
.page-about .section-head--onDark .section-head__title {
  color: var(--offside-white);
}
.page-about .section-head--onDark .section-head__note {
  color: rgba(251, 250, 245, 0.6);
}
.page-about .section-head--onDark .section-head__num,
.page-about .section-head--onDark .section-head__num[data-reveal="pending"] {
  color: rgba(251, 250, 245, 0.4);
}
.page-about .section-head--onDark .section-head__num[data-reveal="in"] {
  color: var(--whistle);
}
.page-about .about-mission__list {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}
.page-about .mission-item {
  border-radius: var(--radius-card);
  border: 1px solid rgba(251, 250, 245, 0.22);
  padding: clamp(20px, 2.6vw, 28px);
  transition: border-color var(--t-base) var(--ease), background var(--t-base) var(--ease);
}
.page-about .mission-item:hover {
  border-color: var(--whistle);
  background: rgba(255, 210, 74, 0.07);
}
.page-about .mission-item__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--whistle);
  color: var(--board-navy);
  font-size: 13px;
  font-weight: 700;
}
.page-about .mission-item__title {
  margin: 14px 0 0;
  font-size: 19px;
  font-weight: 700;
  color: var(--offside-white);
}
.page-about .mission-item__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(251, 250, 245, 0.8);
}

/* ---------- 06 服务 ---------- */
.page-about .about-services {
  padding: clamp(48px, 7vw, 96px) 0 clamp(56px, 7vw, 104px);
}
.page-about .about-services__list {
  list-style: none;
  margin: 38px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}
.page-about .service-card {
  position: relative;
  border-radius: var(--radius-card);
  border: 1px solid var(--line-grey);
  background: #ffffff;
  padding: clamp(20px, 2.8vw, 30px);
  transition: border-color var(--t-base) var(--ease), transform var(--t-base) var(--ease);
}
.page-about .service-card:hover {
  border-color: var(--turf-bright);
  transform: translateY(-2px);
}
.page-about .service-card__num {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ink-mute);
}
.page-about .service-card__title {
  margin: 12px 0 0;
  font-size: 19px;
  font-weight: 700;
  color: var(--ink);
}
.page-about .service-card__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}
.page-about .service-card__meta {
  margin: 16px 0 0;
  padding: 10px 14px;
  border-radius: var(--radius-pill);
  background: var(--whistle-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--board-navy);
  display: inline-block;
}

.page-about .about-cta {
  margin-top: clamp(32px, 5vw, 52px);
  border-radius: var(--radius-card);
  background: var(--turf-deep);
  color: var(--offside-white);
  padding: clamp(24px, 3.4vw, 40px);
}
.page-about .about-cta__text {
  margin: 0;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(251, 250, 245, 0.9);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}
.page-about .about-cta .btn--ghost {
  border-color: rgba(251, 250, 245, 0.5);
  color: var(--offside-white);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-flow__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-services__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-team__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 28px;
  }
  .page-about .team-item:nth-child(2) {
    border-top: 0;
    padding-top: 0;
  }
  .page-about .about-mission__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
  .page-about .about-node__grid {
    display: grid;
    grid-template-columns: 140px minmax(0, 1fr);
    column-gap: 48px;
  }
  .page-about .about-index {
    display: block;
    position: sticky;
    top: var(--about-sticky-top);
    align-self: start;
    padding-left: 16px;
    border-left: 2px solid var(--turf-bright);
  }
  .page-about .about-index__label {
    margin: 0 0 16px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.18em;
    color: var(--ink-mute);
  }
  .page-about .about-index__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 16px;
  }
  .page-about .about-index__link {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    font-family: var(--font-mono);
    font-size: 15px;
    letter-spacing: 0.04em;
    color: var(--ink-mute);
    text-decoration: none;
    transition: color var(--t-fast) var(--ease);
  }
  .page-about .about-index__link::before {
    content: "";
    width: 8px;
    height: 8px;
    flex: none;
    border-radius: 50%;
    background: var(--line-grey);
    transition: background var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
  }
  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    color: var(--turf-deep);
  }
  .page-about .about-index__link:hover::before,
  .page-about .about-index__link:focus-visible::before {
    background: var(--whistle);
    transform: scale(1.35);
  }
}

@media (min-width: 1080px) {
  .page-about .about-flow__list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
  .page-about .about-services__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
  .page-about .node-card {
    padding: 30px 34px;
    margin-bottom: 20px;
  }
}
<<<END>>>