.page-about {
  background: var(--c-paper);
  color: var(--c-turf);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .about-crumb {
  padding-top: clamp(20px, 3vw, 32px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(24px, 4vw, 52px) clamp(56px, 8vw, 116px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 56px 56px;
  opacity: 0.6;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0.15) 88%, transparent 100%);
  mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0.15) 88%, transparent 100%);
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: clamp(28px, 5vw, 48px);
}

.page-about .about-hero__row {
  display: flex;
  align-items: baseline;
  gap: 16px;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 8.4vw, 88px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--c-turf);
}

.page-about .about-hero__text {
  margin: 22px 0 0;
  max-width: 46ch;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.8;
  color: rgba(11, 61, 46, 0.82);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  margin: 30px 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .about-hero__num {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 700;
  color: var(--c-turf);
  line-height: 1;
}

.page-about .about-hero__unit {
  font-size: 14px;
  color: var(--c-sage);
}

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

.page-about .about-hero__mark {
  display: none;
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  border-bottom: 1px solid var(--line);
  background: rgba(216, 214, 206, 0.32);
}

.page-about .about-index__inner {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-block: 14px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index__inner::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__label {
  flex: none;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--c-sage);
}

.page-about .about-index ul {
  display: flex;
  flex: none;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index a {
  display: inline-block;
  padding: 6px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: 14px;
  color: var(--c-turf);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-index a:hover {
  background: var(--c-turf);
  border-color: var(--c-turf);
  color: var(--c-paper);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  position: relative;
  padding-block: clamp(56px, 9vw, 124px);
}

.page-about .about-section__head {
  max-width: 760px;
  margin-bottom: clamp(28px, 4vw, 52px);
}

.page-about .about-section__head .section-title {
  margin: 12px 0 14px;
}

.page-about .about-section__head .section-lead {
  margin: 0;
}

/* ---------- 起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
}

.page-about .about-origin__text p {
  margin: 0 0 18px;
}

.page-about .about-origin__note {
  align-self: start;
  padding: 28px 26px 26px;
  background: var(--c-night);
  color: var(--c-paper);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-about .about-origin__quote {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 2.4vw, 26px);
  line-height: 1.5;
  color: var(--c-paper);
  border-left: 3px solid var(--c-cyan);
  padding-left: 16px;
}

.page-about .about-origin__caption {
  margin: 18px 0 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-leaf);
}

/* ---------- 编辑台（深色） ---------- */
.page-about .about-team {
  background-color: var(--c-night);
  background-image:
    linear-gradient(to right, rgba(247, 244, 236, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(247, 244, 236, 0.06) 1px, transparent 1px);
  background-size: 56px 56px;
  color: var(--c-paper);
}

.page-about .about-team .section-eyebrow {
  color: var(--c-cyan);
}

.page-about .about-team .section-title {
  color: var(--c-paper);
}

.page-about .about-team .section-lead {
  color: rgba(247, 244, 236, 0.78);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-team__cards {
  display: grid;
  gap: 12px;
}

.page-about .about-role {
  border: 1px solid var(--line-dark);
  background: rgba(247, 244, 236, 0.04);
  transition: border-color 0.24s ease, background-color 0.24s ease;
}

.page-about .about-role:hover {
  border-color: var(--c-cyan);
  background: rgba(0, 229, 195, 0.06);
}

.page-about .about-role summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-role__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2vw, 20px);
  color: var(--c-paper);
}

.page-about .about-role[open] .about-role__name {
  color: var(--c-cyan);
}

.page-about .about-role__count {
  flex: none;
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  color: var(--c-amber);
}

.page-about .about-role__body {
  margin: 0;
  padding: 0 20px 20px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(247, 244, 236, 0.76);
}

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

/* ---------- 覆盖范围 ---------- */
.page-about .about-stats {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  margin: 0 0 clamp(28px, 4vw, 44px);
  padding: 0;
  list-style: none;
}

.page-about .about-stat {
  padding: 22px 20px 20px;
  background: var(--c-paper);
  border: 1px solid var(--line);
  border-top: 3px solid var(--c-turf);
  transition: transform 0.24s ease, border-color 0.24s ease, background-color 0.24s ease;
}

.page-about .about-stat:hover {
  transform: translateY(-2px);
  border-color: var(--c-turf);
  border-top-color: var(--c-amber);
  background: #fffdf6;
}

.page-about .about-stat__num {
  margin: 0;
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(34px, 4.6vw, 50px);
  font-weight: 700;
  line-height: 1;
  color: var(--c-turf);
}

.page-about .about-stat__label {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--c-turf);
}

.page-about .about-stat__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-sage);
}

.page-about .about-reach__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px 32px;
  padding-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid var(--line-strong);
}

.page-about .about-reach__foot p {
  flex: 1 1 340px;
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(11, 61, 46, 0.82);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

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

.page-about .about-partners__text p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(11, 61, 46, 0.84);
}

.page-about .about-partners__list {
  display: grid;
  gap: 12px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
}

.page-about .about-partners__list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px 16px;
  border-left: 3px solid var(--c-leaf);
  background: rgba(184, 217, 196, 0.26);
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-turf);
}

.page-about .about-partners__num {
  flex: none;
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: 22px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--c-turf);
}

.page-about .about-partners__cta {
  margin: 0;
  font-size: 15px;
  color: var(--c-sage);
}

.page-about .about-partners__cta a {
  color: var(--c-turf);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__axis {
  display: none;
}

.page-about .about-timeline__axis line {
  stroke: var(--c-stand);
  stroke-width: 2;
  stroke-dasharray: 5 9;
}

.page-about .about-timeline__axis .axis-dot {
  fill: var(--c-turf);
}

.page-about .about-timeline__axis .axis-dot--now {
  fill: var(--c-amber);
}

.page-about .about-timeline__axis .axis-label {
  font-family: var(--font-data);
  font-size: 18px;
  fill: var(--c-sage);
}

.page-about .about-timeline__axis .axis-label--now {
  fill: var(--c-turf);
  font-weight: 700;
}

.page-about .about-timeline__list {
  position: relative;
  margin: 0;
  padding: 0 0 0 22px;
  list-style: none;
  border-left: 2px solid var(--c-leaf);
}

.page-about .about-node {
  border-bottom: 1px solid var(--line);
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -6px;
  width: 10px;
  height: 10px;
  margin-top: 24px;
  border-radius: 50%;
  background: var(--c-turf);
}

.page-about .about-node summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  padding: 16px 4px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-node__index {
  flex: none;
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-sage);
}

.page-about .about-node__title {
  flex: 1 1 auto;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(16px, 2vw, 19px);
  color: var(--c-turf);
}

.page-about .about-node[open] .about-node__title {
  color: var(--c-turf);
}

.page-about .about-node[open] .about-node__index {
  color: var(--c-amber);
}

.page-about .about-node[open]::before {
  background: var(--c-cyan);
}

.page-about .about-node__plus {
  position: relative;
  flex: none;
  width: 16px;
  height: 16px;
}

.page-about .about-node__plus::before,
.page-about .about-node__plus::after {
  content: "";
  position: absolute;
  background: var(--c-turf);
  transition: transform 0.22s ease, background-color 0.22s ease;
}

.page-about .about-node__plus::before {
  left: 0;
  right: 0;
  top: 7px;
  height: 2px;
}

.page-about .about-node__plus::after {
  top: 0;
  bottom: 0;
  left: 7px;
  width: 2px;
}

.page-about .about-node[open] .about-node__plus::after {
  transform: scaleY(0);
}

.page-about .about-node[open] .about-node__plus::before {
  background: var(--c-amber);
}

.page-about .about-node__body {
  margin: 0 0 18px;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(11, 61, 46, 0.78);
}

/* ---------- 常回来 ---------- */
.page-about .about-return__panel {
  padding: clamp(26px, 4vw, 52px);
  background: var(--c-leaf);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-about .about-return__head {
  max-width: 700px;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-return__head .section-title {
  margin: 12px 0 14px;
}

.page-about .about-return__head .section-lead {
  margin: 0;
  color: rgba(11, 61, 46, 0.82);
}

.page-about .about-return__list {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-return__item {
  padding: 22px 20px;
  background: var(--c-paper);
  border-top: 3px solid var(--c-turf);
  transition: transform 0.24s ease, border-top-color 0.24s ease;
}

.page-about .about-return__item:hover {
  transform: translateY(-2px);
  border-top-color: var(--c-amber);
}

.page-about .about-return__item h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2vw, 20px);
  color: var(--c-turf);
}

.page-about .about-return__item p {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(11, 61, 46, 0.8);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: center;
  }

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

  .page-about .about-timeline__axis {
    display: block;
    width: 100%;
    height: auto;
    margin-bottom: clamp(24px, 3vw, 40px);
  }

  .page-about .about-timeline__list {
    padding-left: 0;
    border-left: 0;
  }

  .page-about .about-node {
    padding-left: 0;
  }

  .page-about .about-node::before {
    display: none;
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .about-hero__text {
    max-width: 42ch;
  }

  .page-about .about-hero__mark {
    display: block;
    position: absolute;
    top: clamp(96px, 11vw, 180px);
    right: clamp(6px, 1.4vw, 20px);
    writing-mode: vertical-rl;
    font-family: var(--font-data);
    font-size: 12px;
    letter-spacing: 0.34em;
    color: var(--c-sage);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index a,
  .page-about .about-stat,
  .page-about .about-role,
  .page-about .about-return__item,
  .page-about .about-node__plus::before,
  .page-about .about-node__plus::after {
    transition: none;
  }

  .page-about .about-stat:hover,
  .page-about .about-return__item:hover {
    transform: none;
  }
}