.page-about {
  --about-rail: 268px;
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-crumb {
  padding-top: clamp(16px, 3vw, 28px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(18px, 3.4vw, 34px) 0 clamp(38px, 6vw, 66px);
  border-bottom: 1px solid var(--line-strong);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(17, 23, 19, 0.055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(17, 23, 19, 0.055) 1px, transparent 1px);
  background-size: 52px 52px;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.8), transparent 88%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.8), transparent 88%);
  pointer-events: none;
}

.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 34px);
}

.page-about .about-hero__rail {
  border-left: 3px solid var(--green);
  padding-left: 14px;
}

.page-about .about-facts {
  margin: 14px 0 0;
  display: grid;
  gap: 9px;
}

.page-about .about-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 6px;
  border-bottom: 1px dashed var(--line);
  font-size: var(--fs-meta);
}

.page-about .about-facts__row dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-60);
}

.page-about .about-facts__row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--green);
  text-align: right;
}

.page-about .about-hero__lead h1 {
  margin: 0;
  font-family: var(--font-title);
  font-size: clamp(38px, 7vw, 74px);
  line-height: 1.05;
  font-weight: 800;
  letter-spacing: -0.025em;
  text-wrap: balance;
}

.page-about .about-hero__dek {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 60ch;
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--ink-80);
}

.page-about .about-hero__actions {
  margin-top: clamp(20px, 3vw, 30px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__figure {
  margin: clamp(26px, 4vw, 42px) 0 0;
}

.page-about .about-hero__media {
  border: 1px solid var(--line-strong);
  background: var(--paper-2);
  overflow: hidden;
  clip-path: polygon(0 0, calc(100% - 30px) 0, 100% 30px, 100% 100%, 30px 100%, 0 calc(100% - 30px));
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.04);
}

.page-about .figure__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink-60);
  letter-spacing: 0.01em;
}

/* ---------- 通用双栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 26px);
}

.page-about .about-split__rail {
  border-top: 2px solid var(--green);
  padding-top: 12px;
}

.page-about .about-split__note {
  margin: 10px 0 0;
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink-60);
  max-width: 34ch;
}

.page-about .about-h2 {
  margin: 0 0 clamp(14px, 2vw, 20px);
  font-family: var(--font-title);
  font-size: var(--fs-h2);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.018em;
  color: var(--ink);
  text-wrap: balance;
}

.page-about .about-h2--tight {
  margin-bottom: clamp(10px, 1.6vw, 14px);
}

.page-about .about-body p,
.page-about .about-body__p {
  margin: 0 0 1.05em;
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--ink-80);
  max-width: 68ch;
}

.page-about .about-lead {
  font-size: clamp(17px, 1.8vw, 19px);
  color: var(--ink);
}

.page-about .about-benefit {
  margin-top: clamp(20px, 3vw, 28px);
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--green);
  color: var(--paper);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
}

.page-about .about-benefit__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .about-benefit__text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: rgba(245, 242, 234, 0.92);
}

/* ---------- 时间线 ---------- */
.page-about .about-history__figure {
  margin: 0 0 clamp(20px, 3vw, 28px);
}

.page-about .about-history__media {
  border: 1px solid var(--line);
  background: var(--steel-soft);
  overflow: hidden;
}

.page-about .about-history__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.75);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(10px, 1.8vw, 16px);
}

.page-about .about-node {
  border: 1px solid var(--line-strong);
  border-left: 4px solid var(--green);
  background: var(--paper-2);
}

.page-about .about-node__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: clamp(12px, 1.8vw, 16px) clamp(13px, 1.8vw, 18px);
  cursor: pointer;
  list-style: none;
}

.page-about .about-node__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-node__summary:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: -3px;
}

.page-about .about-node__year {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 3px 8px;
  color: var(--green-deep);
  background: var(--amber-soft);
  white-space: nowrap;
}

.page-about .about-node__title {
  font-family: var(--font-title);
  font-size: clamp(16px, 1.6vw, 19px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
  transition: color 180ms var(--ease);
}

.page-about .about-node__toggle {
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1;
  color: var(--ink-40);
  transition: transform 200ms var(--ease);
}

.page-about .about-node__toggle::before {
  content: "+";
}

.page-about .about-node[open] .about-node__toggle::before {
  content: "−";
}

.page-about .about-node__summary:hover .about-node__title {
  color: var(--green);
}

.page-about .about-node__body {
  padding: 0 clamp(13px, 1.8vw, 18px) clamp(14px, 1.8vw, 18px);
  border-top: 1px dashed var(--line);
  margin-top: 2px;
}

.page-about .about-node__body p {
  margin: 12px 0 0;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--ink-80);
  max-width: 62ch;
}

/* ---------- 溯源机制 ---------- */
.page-about .about-mech {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-mech__card {
  padding: clamp(16px, 2.4vw, 22px);
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-top: 3px solid var(--green);
}

.page-about .about-mech__card--amber {
  border-top-color: var(--amber);
}

.page-about .about-mech__card--steel {
  border-top-color: var(--steel);
}

.page-about .about-mech__num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ink-40);
}

.page-about .about-mech__title {
  margin: 0 0 8px;
  font-family: var(--font-title);
  font-size: clamp(16px, 1.7vw, 19px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-mech__text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink-80);
}

/* ---------- 团队与网络 ---------- */
.page-about .about-team__stats {
  margin: clamp(20px, 3vw, 28px) 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-stat {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-stat__num {
  font-family: var(--font-title);
  font-size: clamp(30px, 3.6vw, 42px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--green);
  min-width: 2ch;
}

.page-about .about-stat__label {
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--ink-60);
}

.page-about .about-net {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 26px);
  align-items: start;
}

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

.page-about .about-net__media {
  border: 1px solid var(--line-strong);
  background: var(--steel-soft);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .about-net__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.62) contrast(1.05);
}

.page-about .about-net__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-net__item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 12px 12px 10px;
  border-left: 2px solid transparent;
  transition: background-color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .about-net__item:hover,
.page-about .about-net__item:focus-within {
  background: var(--paper-2);
  border-left-color: var(--green);
}

.page-about .about-net__item .status-dot {
  margin-top: 6px;
  flex: none;
}

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

.page-about .about-net__name {
  margin: 0;
  font-family: var(--font-title);
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
  transition: color 180ms var(--ease);
}

.page-about .about-net__item:hover .about-net__name {
  color: var(--green);
}

.page-about .about-net__note {
  margin: 3px 0 0;
  font-family: var(--font-body);
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--ink-60);
}

/* ---------- 治理制度 ---------- */
.page-about .about-guards {
  list-style: none;
  counter-reset: guard;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-guards__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-guards__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--amber);
  padding-top: 3px;
}

.page-about .about-guards__title {
  margin: 0 0 5px;
  font-family: var(--font-title);
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-guards__text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-80);
}

/* ---------- 覆盖规模 ---------- */
.page-about .about-scale {
  margin-top: clamp(18px, 3vw, 26px);
  padding: clamp(22px, 3.6vw, 38px);
  background: var(--green-deep);
  color: var(--paper);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 30px);
  clip-path: polygon(0 0, calc(100% - 34px) 0, 100% 34px, 100% 100%, 0 100%);
}

.page-about .about-scale__stat {
  border-left: 2px solid var(--amber);
  padding-left: 14px;
}

.page-about .about-scale__num {
  display: block;
  font-family: var(--font-title);
  font-size: clamp(30px, 3.8vw, 46px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.page-about .about-scale__label {
  display: block;
  margin-top: 6px;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.6;
  color: rgba(245, 242, 234, 0.72);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  border-top: 1px solid var(--line-strong);
}

.page-about .about-next__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  align-items: start;
}

.page-about .about-next__text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-80);
  max-width: 62ch;
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .about-mech {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-team__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-stat {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    border-bottom: none;
    border-left: 2px solid var(--line-strong);
    padding: 4px 0 4px 12px;
  }

  .page-about .about-net {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 24px;
  }

  .page-about .about-guards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 28px;
  }

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

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .about-next__links {
    flex-direction: column;
    align-items: stretch;
    min-width: 168px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(30px, 5vw, 64px);
    align-items: start;
  }

  .page-about .about-hero__rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .about-split {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(30px, 5vw, 68px);
    align-items: start;
  }

  .page-about .about-split__rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .about-timeline__item:nth-child(odd) .about-node {
    margin-right: 15%;
  }

  .page-about .about-timeline__item:nth-child(even) .about-node {
    margin-left: 15%;
    border-left-color: var(--steel);
  }

  .page-about .about-timeline__item:nth-child(even) .about-node__year {
    background: var(--steel-soft);
    color: var(--steel);
  }

  .page-about .about-net {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node__title,
  .page-about .about-node__toggle,
  .page-about .about-net__item,
  .page-about .about-net__name {
    transition: none;
  }
}
<<<END>>>