.page-about {
  --about-rail: 40px;
  --about-line: 20px;
  position: relative;
  background: var(--c-paper);
  color: var(--c-ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* 面包屑 */
.page-about .about-crumbs {
  padding-top: clamp(16px, 3vw, 26px);
  padding-bottom: 10px;
}
.page-about .crumbs {
  font-size: var(--fs-13);
  letter-spacing: .04em;
}
.page-about .crumbs a {
  color: var(--c-turf);
  text-decoration: none;
}
.page-about .crumbs a:hover {
  text-decoration: underline;
}
.page-about .crumbs__sep {
  margin: 0 8px;
  color: var(--c-silver);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  border-bottom: var(--edge) solid var(--c-ink);
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(79, 227, 193, .2) 0%, rgba(79, 227, 193, 0) 58%),
    linear-gradient(180deg, var(--c-paper) 0%, var(--c-paper-2) 100%);
  overflow: hidden;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -32%;
  right: -20%;
  width: 46%;
  height: 176%;
  background: rgba(23, 104, 63, .1);
  transform: rotate(-8deg);
  pointer-events: none;
}
.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 30px;
  padding: clamp(32px, 6vw, 70px) 0 clamp(28px, 5vw, 54px);
}
.page-about .about-hero__title {
  margin: 14px 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(31px, 5.4vw, 58px);
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--c-ink);
}
.page-about .about-hero__mark {
  color: var(--c-turf);
  box-shadow: inset 0 -0.16em 0 rgba(79, 227, 193, .55);
}
.page-about .about-hero__lead {
  max-width: 44em;
  color: var(--c-ink);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-hero__board {
  position: relative;
  background: var(--c-ink-blue);
  color: var(--c-white);
  border: var(--edge) solid var(--c-ink);
  box-shadow: 10px 10px 0 var(--c-turf);
  padding: 22px 20px 20px;
}
.page-about .about-hero__board-tag {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .34em;
  text-transform: uppercase;
  color: var(--c-neon);
}
.page-about .about-hero__board-num {
  margin: 0;
  font-size: clamp(28px, 4.4vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .01em;
  color: var(--c-white);
}
.page-about .about-hero__dash {
  color: var(--c-orange);
  margin: 0 4px;
}
.page-about .about-hero__board-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid rgba(252, 250, 246, .22);
  display: grid;
  gap: 9px;
  font-size: var(--fs-13);
  letter-spacing: .02em;
}
.page-about .about-hero__board-list li {
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.page-about .about-hero__board-list b {
  min-width: 3.2em;
  font-size: 17px;
  color: var(--c-neon);
}
.page-about .about-hero__board-list span {
  color: rgba(252, 250, 246, .84);
}

.page-about .about-hero__rule {
  height: 16px;
  border-top: var(--edge) solid var(--c-ink);
  background-image: repeating-linear-gradient(90deg, var(--c-ink) 0 1px, transparent 1px 18px);
  background-position: left bottom;
  background-size: 18px 10px;
  background-repeat: repeat-x;
  opacity: .85;
}

/* 章节轨道 */
.page-about .about-chapters {
  position: relative;
  padding: clamp(38px, 6vw, 82px) 0 clamp(44px, 7vw, 90px);
}
.page-about .about-chapters::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: var(--about-line);
  width: 2px;
  background: linear-gradient(180deg,
      rgba(169, 179, 188, 0) 0%,
      var(--c-silver) 5%,
      var(--c-silver) 95%,
      rgba(169, 179, 188, 0) 100%);
  opacity: .65;
}

.page-about .about-chapter {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  gap: 14px;
  padding-bottom: clamp(38px, 6vw, 74px);
}
.page-about .about-chapter:last-child {
  padding-bottom: 0;
}
.page-about .about-chapter__rail {
  position: relative;
  min-height: 44px;
}
.page-about .about-chapter__dot {
  position: absolute;
  left: var(--about-line);
  top: 6px;
  width: 12px;
  height: 12px;
  transform: translateX(-50%);
  border-radius: 50%;
  background: var(--c-turf);
  box-shadow: 0 0 0 4px var(--c-paper), 0 0 0 5px rgba(23, 104, 63, .28);
}
.page-about .about-chapter__idx {
  display: none;
  position: absolute;
  left: 34px;
  top: 2px;
  writing-mode: vertical-rl;
  font-size: 11px;
  letter-spacing: .3em;
  color: var(--c-silver);
  white-space: nowrap;
}

.page-about .about-chapter__body > .eyebrow {
  margin-bottom: 8px;
}
.page-about .about-chapter__body p {
  margin: 0 0 14px;
  line-height: 1.78;
  color: var(--c-ink);
}
.page-about .about-chapter__body .section-title {
  margin: 0 0 16px;
}

/* 分栏 */
.page-about .about-split {
  display: grid;
  gap: 24px;
}
.page-about .about-split__main p:last-child {
  margin-bottom: 0;
}
.page-about .about-figure {
  margin: 0;
  position: relative;
}
.page-about .about-figure--wide {
  margin-bottom: 30px;
}

/* 团队条形 */
.page-about .about-bars {
  list-style: none;
  margin: 22px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--hairline);
  display: grid;
  gap: 14px;
}
.page-about .about-bars__row {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr) 34px;
  align-items: center;
  gap: 12px;
}
.page-about .about-bars__label {
  font-size: var(--fs-13);
  letter-spacing: .02em;
  color: var(--c-turf-deep);
}
.page-about .about-bars__track {
  display: block;
  height: 11px;
  background: var(--c-paper-2);
  border: 1px solid var(--hairline);
  overflow: hidden;
}
.page-about .about-bars__fill {
  display: block;
  height: 100%;
}
.page-about .about-bars__fill--a {
  width: 100%;
  background: var(--c-turf);
}
.page-about .about-bars__fill--b {
  width: 42.8%;
  background: var(--c-turf-deep);
}
.page-about .about-bars__fill--c {
  width: 19%;
  background: var(--c-orange);
}
.page-about .about-bars__val {
  text-align: right;
  font-size: 15px;
  font-weight: 700;
  color: var(--c-ink);
}

/* 深色数据面板 */
.page-about .about-panel {
  padding: clamp(22px, 4vw, 42px);
  border: var(--edge) solid var(--c-turf-deep);
}
.page-about .about-panel__eyebrow {
  color: var(--c-neon);
  margin-bottom: 10px;
}
.page-about .about-panel__lead {
  color: rgba(252, 250, 246, .88);
  line-height: 1.78;
  margin: 0;
  max-width: 52em;
}
.page-about .about-panel__foot {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid rgba(252, 250, 246, .18);
  font-size: var(--fs-13);
  letter-spacing: .03em;
  color: var(--c-neon);
}
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(136px, 1fr));
  gap: 20px;
  margin-top: 26px;
  padding-top: 24px;
  border-top: 1px solid rgba(252, 250, 246, .2);
}
.page-about .about-panel .stat__num {
  color: var(--c-neon);
  font-size: clamp(30px, 4.6vw, 44px);
  font-weight: 700;
  line-height: 1;
  display: block;
}
.page-about .about-panel .stat__label {
  display: block;
  margin-top: 8px;
  font-size: var(--fs-13);
  letter-spacing: .02em;
  color: rgba(252, 250, 246, .74);
}

/* 细节清单 */
.page-about .about-spec {
  margin: 0;
  display: grid;
  border-top: 1px solid var(--hairline);
}
.page-about .about-spec > div {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--hairline);
}
.page-about .about-spec dt {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-16);
  letter-spacing: .01em;
  color: var(--c-turf-deep);
}
.page-about .about-spec dd {
  margin: 0;
  line-height: 1.78;
  color: var(--c-ink);
}

/* 阶段 */
.page-about .about-stages {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 22px;
}
.page-about .about-stages__item {
  position: relative;
  padding-left: 26px;
  border-left: 2px solid var(--hairline);
}
.page-about .about-stages__item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-paper);
  border: 2px solid var(--c-turf);
}
.page-about .about-stages__ver {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: .26em;
  color: var(--c-orange);
}
.page-about .about-stages__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-20);
  letter-spacing: -.01em;
  color: var(--c-ink);
}
.page-about .about-stages__item p:last-child {
  margin: 0;
  line-height: 1.74;
  font-size: var(--fs-16);
  color: var(--c-ink);
}

/* 合作生态 */
.page-about .about-partners {
  position: relative;
  background: var(--c-turf);
  color: var(--c-white);
  border: var(--edge) solid var(--c-turf-deep);
  padding: clamp(22px, 4vw, 40px);
}
.page-about .about-partners__eyebrow {
  color: var(--c-neon);
  margin-bottom: 10px;
}
.page-about .about-partners__title {
  color: var(--c-white);
  margin: 0 0 14px;
}
.page-about .about-partners__lead {
  margin: 0;
  max-width: 50em;
  line-height: 1.78;
  color: rgba(252, 250, 246, .9);
}
.page-about .about-partners__list {
  list-style: none;
  margin: 24px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid rgba(252, 250, 246, .26);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 18px;
}
.page-about .about-partners__list li {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.page-about .about-partners__list b {
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--c-white);
}
.page-about .about-partners__list span {
  font-size: var(--fs-13);
  letter-spacing: .02em;
  color: rgba(252, 250, 246, .82);
}

/* 服务保障 */
.page-about .about-service {
  display: grid;
  gap: 16px;
}
.page-about .about-service__item {
  background: var(--c-paper-2);
  border-left: var(--edge) solid var(--c-orange);
  padding: 18px 20px;
  box-shadow: var(--shadow-paper);
  transition: box-shadow .25s ease, transform .25s ease;
}
.page-about .about-service__item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lift);
}
.page-about .about-service__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-16);
  letter-spacing: .02em;
  color: var(--c-turf-deep);
}
.page-about .about-service__item p {
  margin: 0;
  line-height: 1.74;
  font-size: var(--fs-16);
}

/* 继续了解 */
.page-about .about-next {
  margin-top: clamp(30px, 5vw, 50px);
  padding-top: 22px;
  border-top: var(--edge) solid var(--c-ink);
}
.page-about .about-next__label {
  margin: 0 0 14px;
}
.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .about-next__list a {
  display: inline-block;
  padding: 9px 18px;
  border: 1px solid var(--c-turf);
  color: var(--c-turf-deep);
  background: transparent;
  font-size: var(--fs-13);
  letter-spacing: .06em;
  text-decoration: none;
  transition: background-color .2s ease, color .2s ease;
}
.page-about .about-next__list a:hover {
  background: var(--c-turf);
  color: var(--c-white);
}

/* 平板及以上 */
@media (min-width: 700px) {
  .page-about .about-spec > div {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
  .page-about .about-service {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about {
    --about-rail: 110px;
    --about-line: 20px;
  }
  .page-about .about-chapter {
    gap: 30px;
  }
  .page-about .about-chapter__idx {
    display: block;
  }
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.38fr) minmax(270px, .62fr);
    align-items: end;
    gap: 54px;
  }
  .page-about .about-stages {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }
  .page-about .about-stages__item {
    padding: 34px 22px 0 0;
    border-left: 0;
  }
  .page-about .about-stages__item::before {
    left: 0;
    top: 0;
    width: 12px;
    height: 12px;
  }
  .page-about .about-stages__item::after {
    content: "";
    position: absolute;
    top: 5px;
    left: 14px;
    right: 0;
    height: 2px;
    background: var(--c-silver);
    opacity: .8;
  }
  .page-about .about-stages__item:last-child::after {
    right: 55%;
  }
}

@media (min-width: 980px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr);
    gap: 36px;
    align-items: start;
  }
  .page-about .about-split--flip {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
  }
}

/* 无障碍：减少动效 */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-service__item {
    transition: none;
  }
  .page-about .about-service__item:hover {
    transform: none;
  }
  .page-about .about-next__list a {
    transition: none;
  }
}