.page-about {
  --about-pad-block: 56px;
  position: relative;
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-block: 18px 22px;
}

/* ---------- 开篇全宽横幅 ---------- */
.page-about .about-banner {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--carbon);
  border-bottom: 1px solid var(--line);
}

.page-about .about-banner__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-banner__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 42%;
  filter: saturate(.5) contrast(1.08) brightness(.46);
}

.page-about .about-banner__shade {
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(104deg, rgba(5, 8, 10, .95) 0%, rgba(11, 26, 22, .88) 44%, rgba(11, 26, 22, .30) 100%),
    linear-gradient(0deg, rgba(11, 26, 22, .92) 0%, rgba(11, 26, 22, 0) 58%);
}

.page-about .about-banner__inner {
  position: relative;
  z-index: 2;
  padding-block: 64px 78px;
}

.page-about .about-banner__copy {
  max-width: 62ch;
}

.page-about .about-banner__copy::before {
  content: "";
  display: block;
  width: 72px;
  height: 3px;
  margin-bottom: 22px;
  background: linear-gradient(90deg, var(--flare) 0%, var(--flare-soft) 100%);
}

.page-about .about-banner h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(29px, 6.4vw, 54px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -.025em;
  color: var(--paper);
  transform: skewX(-4deg);
  transform-origin: left bottom;
  padding-right: .1em;
  text-wrap: balance;
}

.page-about .about-banner .lede {
  margin-top: 20px;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--silver);
  max-width: 58ch;
}

.page-about .about-banner::after {
  content: "";
  position: absolute;
  left: -3%;
  right: -3%;
  bottom: -1px;
  height: 38px;
  z-index: 3;
  background: var(--bg);
  clip-path: polygon(0 100%, 100% 14%, 100% 100%);
}

/* ---------- 通用小标题区 ---------- */
.page-about .about-head {
  max-width: 700px;
}

.page-about .about-head h2 {
  margin-top: 10px;
  font-family: var(--font-display);
  font-size: clamp(23px, 4vw, 34px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-head__note {
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 主张释义 ---------- */
.page-about .about-claim {
  padding-block: var(--about-pad-block);
}

.page-about .about-claim__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.page-about .about-claim__title h2 {
  margin-top: 10px;
  font-family: var(--font-display);
  font-size: clamp(23px, 4vw, 33px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-claim__body p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--silver);
  max-width: 68ch;
}

.page-about .about-claim__body p + p {
  margin-top: 16px;
}

.page-about .about-claim__body p:first-child {
  padding-left: 18px;
  border-left: 2px solid var(--flare);
  color: var(--paper);
}

/* ---------- 四大板块 ---------- */
.page-about .about-board {
  padding-block: var(--about-pad-block);
  background: linear-gradient(180deg, rgba(18, 37, 32, 0) 0%, rgba(18, 37, 32, .55) 40%, rgba(18, 37, 32, 0) 100%);
}

.page-about .about-board__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 32px;
}

.page-about .board-cell {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 44px;
  padding: 26px 24px 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 2px;
  color: inherit;
  text-decoration: none;
  transition: transform .2s var(--ease), border-color .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .board-cell::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 44px;
  height: 3px;
  background: var(--muted);
}

.page-about a.board-cell:hover,
.page-about a.board-cell:focus-visible {
  transform: translateY(-2px);
  border-color: var(--line-strong);
  box-shadow: 0 14px 34px rgba(5, 8, 10, .55);
}

.page-about .board-cell--primary::before {
  width: 96px;
  background: linear-gradient(90deg, var(--flare), var(--flare-soft));
}

.page-about .board-cell--b::before { background: var(--silver); }
.page-about .board-cell--c::before { background: var(--amber); }
.page-about .board-cell--d::before { background: var(--flare-soft); }

.page-about .board-cell--d {
  border-style: dashed;
  background: transparent;
}

.page-about .board-cell__index {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .board-cell__title {
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .board-cell--primary .board-cell__title {
  font-size: 30px;
}

.page-about .board-cell__desc {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .board-cell--primary .board-cell__desc {
  font-size: 16px;
  color: var(--silver);
  max-width: 46ch;
}

.page-about .board-cell__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .board-cell__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--silver);
  font-family: var(--font-data);
}

.page-about .board-cell__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 7px;
  height: 1px;
  background: var(--flare);
}

.page-about .board-cell__go {
  margin-top: auto;
  padding-top: 8px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--flare);
}

.page-about .about-board__foot {
  margin-top: 22px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 62ch;
}

/* ---------- 整理与校对 ---------- */
.page-about .about-flow {
  padding-block: var(--about-pad-block);
}

.page-about .about-flow__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
  align-items: start;
}

.page-about .about-flow h2 {
  margin-top: 10px;
  font-family: var(--font-display);
  font-size: clamp(23px, 4vw, 34px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-flow__intro {
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 56ch;
}

.page-about .flow-steps {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow-step {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 16px;
  padding-bottom: 24px;
}

.page-about .flow-step__marker {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.page-about .flow-step__no {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  background: var(--panel);
  font-family: var(--font-data);
  font-size: 14px;
  font-weight: 700;
  color: var(--flare);
}

.page-about .flow-step__arrow {
  color: var(--flare-soft);
  opacity: .75;
}

.page-about .flow-step:last-child .flow-step__arrow {
  visibility: hidden;
}

.page-about .flow-step__text h3 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
  padding-top: 12px;
}

.page-about .flow-step__text p {
  margin-top: 7px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--silver);
  max-width: 58ch;
}

/* ---------- 通用图片容器 ---------- */
.page-about .about-media {
  margin: 0;
  background: var(--carbon);
  border: 1px solid var(--line);
  border-radius: 2px;
  overflow: hidden;
}

.page-about .about-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-media figcaption {
  padding: 12px 16px 14px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  line-height: 1.7;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .about-flow__figure img {
  aspect-ratio: 3 / 2;
}

/* ---------- 运营时间线 ---------- */
.page-about .about-timeline {
  padding-block: var(--about-pad-block);
  background: linear-gradient(180deg, rgba(5, 8, 10, .55) 0%, rgba(5, 8, 10, 0) 30%);
}

.page-about .about-timeline__figure {
  margin-top: 30px;
}

.page-about .about-timeline__figure img {
  aspect-ratio: 16 / 7;
}

.page-about .about-track {
  position: relative;
  margin: 44px 0 0;
  padding: 0 0 0 24px;
  list-style: none;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--flare) 0%, var(--line-strong) 20%, var(--line-strong) 100%);
}

.page-about .track-node {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding-bottom: 32px;
}

.page-about .track-node__dot {
  position: absolute;
  left: -24px;
  top: 7px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--flare);
  box-shadow: 0 0 0 4px rgba(255, 74, 28, .12);
  transition: background-color .2s var(--ease);
}

.page-about .track-node:hover .track-node__dot,
.page-about .track-node:focus-within .track-node__dot {
  background: var(--flare);
}

.page-about .track-node__stage h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .track-node__meta {
  margin-top: 5px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
}

.page-about .track-node__body p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 62ch;
  transition: color .2s var(--ease);
}

.page-about .track-node:hover .track-node__body p,
.page-about .track-node:focus-within .track-node__body p {
  color: var(--silver);
}

/* ---------- 团队构成 ---------- */
.page-about .about-team {
  padding-block: var(--about-pad-block);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 30px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 2px;
  overflow: hidden;
}

.page-about .team-cell {
  padding: 26px 22px 28px;
  background: var(--bg);
}

.page-about .team-cell__no {
  display: block;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--flare);
}

.page-about .team-cell__title {
  margin-top: 12px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .team-cell__desc {
  margin-top: 9px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-team__note {
  margin-top: 24px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--silver);
  max-width: 66ch;
  padding-left: 18px;
  border-left: 2px solid var(--line-strong);
}

/* ---------- 内容边界 ---------- */
.page-about .about-boundary {
  padding-block: 48px 64px;
  border-top: 1px solid var(--line);
}

.page-about .about-boundary__inner {
  max-width: 800px;
}

.page-about .about-boundary h2 {
  font-family: var(--font-display);
  font-size: clamp(22px, 3.6vw, 30px);
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-boundary .prose {
  margin-top: 20px;
}

.page-about .about-boundary .prose p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--silver);
  max-width: 68ch;
}

.page-about .about-boundary .prose p + p {
  margin-top: 14px;
}

.page-about .about-boundary__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-boundary__top {
  margin-top: 34px;
  font-size: 13px;
  letter-spacing: .06em;
}

.page-about .about-boundary__top a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 3px;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-boundary__top a:hover,
.page-about .about-boundary__top a:focus-visible {
  color: var(--flare);
  border-color: var(--flare);
}

.page-about .about-boundary__top a:focus-visible,
.page-about .board-cell:focus-visible,
.page-about .btn:focus-visible {
  outline: 2px solid var(--flare);
  outline-offset: 3px;
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about {
    --about-pad-block: 68px;
  }

  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-claim__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 40px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about {
    --about-pad-block: 84px;
  }

  .page-about .about-banner__inner {
    padding-block: 84px 104px;
  }

  .page-about .about-banner::after {
    height: 52px;
  }

  .page-about .about-board__grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .board-cell--primary {
    grid-column: 1 / 4;
    grid-row: 1 / 3;
  }

  .page-about .board-cell--b {
    grid-column: 4 / 7;
    grid-row: 1 / 2;
  }

  .page-about .board-cell--c {
    grid-column: 4 / 7;
    grid-row: 2 / 3;
  }

  .page-about .board-cell--d {
    grid-column: 1 / 7;
    grid-row: 3 / 4;
  }

  .page-about .about-flow__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 52px;
  }

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

  .page-about .track-node {
    grid-template-columns: minmax(0, 280px) minmax(0, 1fr);
    gap: 34px;
    align-items: start;
    padding-bottom: 36px;
  }

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

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .board-cell,
  .page-about .track-node__dot,
  .page-about .track-node__body p {
    transition: none;
  }

  .page-about a.board-cell:hover,
  .page-about a.board-cell:focus-visible {
    transform: none;
  }
}