.page-about {
  --rail-w: 152px;
  --about-pad: 24px;
  display: block;
  background: var(--green-900);
  color: var(--white);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about * {
  box-sizing: border-box;
}

.page-about a {
  color: var(--yellow);
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 208, 36, .45);
  transition: border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}

.page-about a:hover,
.page-about a:focus-visible {
  border-bottom-color: var(--yellow);
  color: var(--white);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 76px) var(--about-pad) 64px;
  background: var(--green-900);
  border-bottom: var(--rule) solid var(--yellow);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(56%, 760px);
  height: 100%;
  background: var(--night);
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 100%);
  opacity: .95;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: -10px 0;
  background-image: repeating-linear-gradient(0deg, rgba(245, 250, 255, .045) 0 1px, transparent 1px 5px);
  pointer-events: none;
  animation: about-scan 40s linear infinite;
}

@keyframes about-scan {
  from { transform: translateY(0); }
  to { transform: translateY(40px); }
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  max-width: 1120px;
}

.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 28px;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
}

.page-about .about-crumb .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: rgba(147, 169, 160, .6);
}

.page-about .about-crumb .breadcrumb__link {
  color: var(--mist);
  border-bottom-color: transparent;
}

.page-about .about-crumb .breadcrumb__link:hover {
  color: var(--yellow);
}

.page-about .about-crumb [aria-current="page"] {
  color: var(--yellow);
}

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

.page-about .about-hero__title {
  margin: 0;
  max-width: 14em;
  font-size: clamp(34px, 7.2vw, 68px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -.015em;
  color: var(--white);
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--yellow);
  -webkit-text-stroke: 1px rgba(10, 42, 30, .4);
}

.page-about .about-hero__lead {
  max-width: 44em;
  margin: 30px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(245, 250, 255, .86);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 20px;
  margin: 40px 0 0;
  padding: 26px 0 0;
  border-top: 1px dashed rgba(147, 169, 160, .35);
  list-style: none;
}

.page-about .about-hero__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 5vw, 38px);
  font-weight: 700;
  line-height: 1.05;
  color: var(--yellow);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__unit {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--mist);
  letter-spacing: .04em;
}

/* ---------- 长卷骨架 ---------- */

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

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

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

.page-about .about-section {
  position: relative;
  padding: 68px var(--about-pad) 76px;
  border-bottom: 1px dashed rgba(147, 169, 160, .28);
}

.page-about .about-section--deep {
  background: var(--green-900);
  color: var(--white);
}

.page-about .about-section--night {
  background: var(--night);
  color: var(--white);
}

.page-about .about-section--paper {
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-section__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 30px;
}

.page-about .chapter-no {
  flex: none;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--yellow);
  padding-top: 4px;
}

.page-about .about-section--paper .chapter-no {
  color: var(--green-700);
}

.page-about .about-section__head h2 {
  position: relative;
  margin: 0;
  padding-bottom: 16px;
  max-width: 20em;
  font-size: clamp(25px, 4.6vw, 44px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -.01em;
  color: inherit;
}

.page-about .about-section__head h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 64px;
  height: 4px;
  background: var(--yellow);
}

.page-about .about-section--paper .about-section__head h2::after {
  background: var(--green-700);
}

.page-about .about-section__lead {
  margin: 0 0 34px;
  max-width: 42em;
  font-size: 16px;
  color: rgba(245, 250, 255, .8);
}

.page-about .about-section--paper .about-section__lead {
  color: #3a4a44;
}

.page-about .prose p {
  margin: 0 0 1.05em;
  max-width: 42em;
}

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

.page-about .prose strong {
  font-weight: 700;
  color: var(--yellow);
}

.page-about .about-section--paper .prose strong {
  color: var(--green-700);
  background: linear-gradient(transparent 62%, rgba(242, 208, 36, .55) 62%);
}

/* ---------- 起点与定位 ---------- */

.page-about .about-origin {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
}

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

/* ---------- 里程碑 ---------- */

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

.page-about .milestone {
  border: 1px solid rgba(147, 169, 160, .3);
  border-left: var(--rule) solid var(--yellow);
  background: rgba(22, 71, 52, .34);
  transition: background var(--dur-mid) var(--ease), border-left-color var(--dur-mid) var(--ease);
}

.page-about .milestone[open] {
  background: rgba(23, 64, 110, .45);
  border-left-color: var(--orange);
}

.page-about .milestone__summary {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr) 18px;
  align-items: center;
  gap: 14px;
  padding: 17px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .milestone__summary:focus-visible {
  outline: 2px solid var(--yellow);
  outline-offset: -2px;
}

.page-about .milestone__year {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--yellow);
  font-variant-numeric: tabular-nums;
}

.page-about .milestone__title {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--white);
}

.page-about .milestone__mark {
  position: relative;
  justify-self: end;
  width: 16px;
  height: 16px;
}

.page-about .milestone__mark::before,
.page-about .milestone__mark::after {
  content: "";
  position: absolute;
  background: var(--yellow);
  transition: transform var(--dur-mid) var(--ease);
}

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

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

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

.page-about .milestone__body {
  padding: 0 18px 18px;
  border-top: 1px dashed rgba(147, 169, 160, .3);
  margin-top: 4px;
}

.page-about .milestone__body p {
  margin: 16px 0 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245, 250, 255, .82);
}

/* ---------- 团队 ---------- */

.page-about .team-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0 0 36px;
  padding: 0;
  list-style: none;
  background: rgba(17, 26, 24, .18);
  border: 1px dashed rgba(17, 26, 24, .3);
}

.page-about .team-stats__item {
  display: grid;
  gap: 4px;
  padding: 20px 18px;
  background: var(--paper);
}

.page-about .team-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(34px, 8vw, 52px);
  font-weight: 900;
  line-height: 1;
  color: var(--green-700);
  font-variant-numeric: tabular-nums;
}

.page-about .team-stats__label {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .team-stats__note {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: #5c6f68;
}

.page-about .about-team p {
  color: #26332f;
}

/* ---------- 流程 ---------- */

.page-about .process-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  margin-bottom: 32px;
}

.page-about .flow {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
  border-left: 1px dashed rgba(17, 26, 24, .3);
}

.page-about .flow__item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 12px;
  padding: 0 0 26px 0;
}

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

.page-about .flow__no {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--orange);
  padding-left: 14px;
  position: relative;
  font-variant-numeric: tabular-nums;
}

.page-about .flow__no::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 8px;
  width: 7px;
  height: 7px;
  background: var(--green-700);
}

.page-about .flow__title {
  margin: 0 0 6px;
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .flow__text p {
  margin: 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.8;
  color: #33423d;
}

.page-about .process-layout__fig {
  margin: 0;
}

.page-about .about-section--paper .media-frame {
  border-color: rgba(17, 26, 24, .55);
}

.page-about .about-section--paper .media-frame__caption {
  color: #4a5b55;
  border-top-color: rgba(17, 26, 24, .22);
}

.page-about .about-flow__tail {
  margin: 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.8;
  color: #33423d;
}

.page-about .about-section--paper .about-flow__tail a {
  color: var(--green-700);
  border-bottom-color: rgba(22, 71, 52, .5);
}

.page-about .about-section--paper .about-flow__tail a:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* ---------- 合作与资质 ---------- */

.page-about .partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  margin-bottom: 36px;
}

.page-about .partner-grid__fig {
  margin: 0;
}

.page-about .partner-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 1px dashed rgba(147, 169, 160, .35);
  background: rgba(147, 169, 160, .22);
}

.page-about .partner-list__item {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  align-items: baseline;
  gap: 6px 14px;
  padding: 18px 16px;
  background: var(--green-900);
}

.page-about .partner-list__num {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 900;
  line-height: 1;
  color: var(--yellow);
  font-variant-numeric: tabular-nums;
}

.page-about .partner-list__label {
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
}

.page-about .partner-list__desc {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 荣誉 ---------- */

.page-about .honors-table__wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-bottom: 30px;
}

.page-about .honors-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  border: 1px dashed rgba(147, 169, 160, .4);
}

.page-about .honors-table caption {
  caption-side: top;
  padding: 0 0 12px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .honors-table thead th {
  padding: 13px 14px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--yellow);
  background: var(--night-600);
  border-bottom: 1px solid rgba(147, 169, 160, .35);
}

.page-about .honors-table tbody td {
  padding: 14px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(245, 250, 255, .88);
  border-bottom: 1px dashed rgba(147, 169, 160, .25);
  vertical-align: top;
}

.page-about .honors-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .honors-table tbody tr:hover td {
  background: rgba(23, 64, 110, .55);
}

.page-about .honors-table .num {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--yellow);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.page-about .honors-notes p {
  max-width: 48em;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245, 250, 255, .82);
}

/* ---------- CTA ---------- */

.page-about .about-cta {
  position: relative;
  padding: 68px var(--about-pad) 78px;
  background: var(--green-700);
  border-top: var(--rule) solid var(--yellow);
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(245, 250, 255, .05) 0 1px, transparent 1px 46px);
  pointer-events: none;
}

.page-about .about-cta__inner {
  position: relative;
  z-index: 1;
  padding: 0;
}

.page-about .about-cta__title {
  margin: 14px 0 16px;
  max-width: 18em;
  font-size: clamp(26px, 5vw, 42px);
  font-weight: 900;
  line-height: 1.22;
  color: var(--white);
}

.page-about .about-cta__lead {
  margin: 0 0 30px;
  max-width: 44em;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(245, 250, 255, .85);
}

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

.page-about .about-cta__actions .btn {
  flex: 0 1 auto;
  text-align: center;
  border-bottom: 0;
}

.page-about .about-cta__actions .btn--ghost {
  color: var(--white);
}

.page-about .about-cta__actions .btn--ghost:hover {
  color: var(--yellow);
}

/* ---------- 图片容器 ---------- */

.page-about .media-frame {
  position: relative;
  margin: 0;
  border: var(--rule) solid var(--green-700);
  background: var(--night);
}

.page-about .media-frame__inner {
  position: relative;
  display: block;
  overflow: hidden;
}

.page-about .media-frame__inner img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.92) contrast(1.06);
}

.page-about .media-frame__inner::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(0deg, rgba(245, 250, 255, .06) 0 1px, transparent 1px 5px);
  pointer-events: none;
}

.page-about .media-frame__caption {
  padding: 10px 12px;
  border-top: 1px dashed rgba(147, 169, 160, .32);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 入场动效 ---------- */

.has-js .page-about [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease);
}

.has-js .page-about [data-reveal="in"] {
  opacity: 1;
  transform: none;
}

/* ---------- 时间轴侧栏 ---------- */

@media (min-width: 900px) {
  .page-about .about-chronicle {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    padding: 104px 20px 104px 32px;
    border-right: 1px solid rgba(147, 169, 160, .22);
    align-self: stretch;
  }

  .page-about .about-rail__sticky {
    position: sticky;
    top: calc(var(--header-h) + 44px);
  }

  .page-about .about-rail__cap {
    margin: 0 0 22px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: .18em;
    color: rgba(147, 169, 160, .8);
  }

  .page-about .timeline {
    position: relative;
    margin: 0;
    padding: 0 0 0 18px;
    list-style: none;
    border-left: 1px solid rgba(147, 169, 160, .3);
    display: grid;
    gap: 26px;
  }

  .page-about .timeline__node {
    position: relative;
    display: grid;
    gap: 2px;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: .05em;
    line-height: 1.5;
    color: rgba(147, 169, 160, .72);
    transition: color var(--dur-mid) var(--ease);
  }

  .page-about .timeline__node::before {
    content: "";
    position: absolute;
    left: -24px;
    top: 4px;
    width: 11px;
    height: 11px;
    border: 2px solid rgba(147, 169, 160, .7);
    background: var(--green-900);
    transition: background var(--dur-mid) var(--ease),
                border-color var(--dur-mid) var(--ease),
                transform var(--dur-mid) var(--ease);
  }

  .page-about .timeline__node[data-active="true"] {
    color: var(--yellow);
  }

  .page-about .timeline__node[data-active="true"]::before {
    background: var(--yellow);
    border-color: var(--yellow);
    transform: scale(1.35);
  }

  .page-about .about-rail__no {
    font-weight: 700;
    font-variant-numeric: tabular-nums;
  }

  .page-about .about-section {
    padding: 96px 72px 104px;
  }

  .page-about .about-section__head {
    gap: 22px;
    margin-bottom: 40px;
  }

  .page-about .about-hero {
    padding: calc(var(--header-h) + 96px) 48px 76px;
  }

  .page-about .about-cta {
    padding: 88px 72px 96px;
  }

  .page-about .about-chronicle > .about-flow > .about-cta {
    padding-left: 72px;
    padding-right: 72px;
  }
}

/* ---------- 中屏栅格 ---------- */

@media (min-width: 760px) {
  .page-about .about-hero {
    padding-left: 40px;
    padding-right: 40px;
  }

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

  .page-about .about-origin {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .process-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, .95fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .partner-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 340px);
    gap: 48px;
    align-items: center;
  }

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

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

@media (min-width: 1040px) {
  .page-about .milestones > li:nth-child(even) {
    margin-left: clamp(28px, 7vw, 96px);
  }

  .page-about .milestones > li:nth-child(odd) {
    margin-right: clamp(20px, 4vw, 56px);
  }
}

/* ---------- 减弱动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero::after {
    animation: none;
  }

  .has-js .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .milestone__mark::before,
  .page-about .milestone__mark::after,
  .page-about .timeline__node::before {
    transition: none;
  }
}
</final>