.page-about {
  background: var(--ink-900);
  color: var(--ice);
  font-family: var(--font-body);
  line-height: 1.75;
}

.page-about .about-wrap {
  position: relative;
  width: min(100% - 32px, var(--content));
  margin-inline: auto;
}

.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--sand);
}

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 3px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h, 84px) + 28px) 0 56px;
  isolation: isolate;
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
  filter: saturate(0.7) contrast(1.05);
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(7, 11, 20, 0.6) 0%, rgba(7, 11, 20, 0.9) 68%, var(--ink-900) 100%),
    linear-gradient(90deg, rgba(7, 11, 20, 0.92) 0%, rgba(7, 11, 20, 0.15) 62%);
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: 26px;
}

.page-about .about-hero__title {
  margin: 14px 0 22px;
  max-width: 14em;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 7.4vw, 72px);
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(16px, 1.9vw, 18.5px);
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-hero__chips {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .about-hero__chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--line);
  background: rgba(13, 21, 36, 0.7);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .about-hero__chip::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--sand);
  flex: none;
}

.page-about .about-hero__chip--tilt {
  transform: rotate(-2deg);
  border-color: var(--sand-soft);
  color: var(--sand);
}

/* ---------- 品牌起点 ---------- */
.page-about .about-origin {
  padding-block: 60px 24px;
}

.page-about .about-origin__inner {
  display: grid;
  gap: 26px;
}

.page-about .about-origin__figure {
  margin: 0;
  border: 1px solid var(--line);
  position: relative;
  overflow: hidden;
  aspect-ratio: 3 / 2;
  background: var(--ink-800);
}

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

.page-about .about-origin__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 45%, rgba(7, 11, 20, 0.72) 100%);
  pointer-events: none;
}

.page-about .about-origin__text h2 {
  margin: 12px 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4.2vw, 40px);
  line-height: 1.12;
  color: var(--ice);
}

.page-about .about-origin__text p {
  margin: 0 0 14px;
  color: var(--mist);
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .about-origin__text p:last-child {
  margin-bottom: 0;
  color: var(--ice);
}

/* ---------- 共用章节头 ---------- */
.page-about .about-section-head {
  display: grid;
  gap: 12px;
  max-width: 54ch;
  margin-bottom: 34px;
}

.page-about .about-section-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(27px, 4.6vw, 44px);
  line-height: 1.1;
  letter-spacing: -0.008em;
  color: var(--ice);
}

.page-about .about-section-head p {
  margin: 0;
  color: var(--mist);
  font-size: 15.5px;
  line-height: 1.78;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  padding-block: 40px 64px;
}

.page-about .about-timeline__list {
  --tl-rail: 46px;
  --tl-gap: 12px;
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: calc(var(--tl-rail) - 1px);
  top: 26px;
  bottom: 24px;
  width: 1px;
  background: linear-gradient(180deg, var(--sand) 0%, var(--line) 34%, var(--line) 100%);
  opacity: 0.7;
}

.page-about .about-entry {
  position: relative;
  display: grid;
  grid-template-columns: var(--tl-rail) minmax(0, 1fr);
  column-gap: var(--tl-gap);
  padding-bottom: 16px;
}

.page-about .about-entry__marker {
  grid-column: 1;
  padding-top: 17px;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--sand);
}

.page-about .about-entry__marker::after {
  content: "";
  position: absolute;
  left: calc(var(--tl-rail) - 4px);
  top: 25px;
  width: 8px;
  height: 8px;
  background: var(--ink-900);
  border: 1px solid var(--sand);
  transform: rotate(45deg);
}

.page-about .about-entry__panel {
  grid-column: 2;
  min-width: 0;
  border: 1px solid var(--line);
  background: var(--ink-800);
  transition: border-color 0.16s var(--ease), background-color 0.16s var(--ease);
}

.page-about .about-entry__panel:hover {
  border-color: var(--sand);
}

.page-about .about-entry__panel[open] {
  background: var(--card);
  border-color: var(--sand);
}

.page-about .about-entry__summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.36;
  color: var(--ice);
}

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

.page-about .about-entry__cue {
  flex: none;
  width: 26px;
  height: 26px;
  margin-top: 1px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  color: var(--sand);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 400;
  transition: border-color 0.16s var(--ease), color 0.16s var(--ease);
}

.page-about .about-entry__cue::before {
  content: "+";
  line-height: 1;
}

.page-about .about-entry__panel[open] .about-entry__cue {
  border-color: var(--sand);
}

.page-about .about-entry__panel[open] .about-entry__cue::before {
  content: "–";
}

.page-about .about-entry__body {
  padding: 14px 16px 18px;
  border-top: 1px solid var(--line);
}

.page-about .about-entry__facts {
  display: grid;
  gap: 12px;
  margin: 0;
}

.page-about .about-entry__row {
  display: grid;
  gap: 3px;
}

.page-about .about-entry__row dt {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--sand);
}

.page-about .about-entry__row dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-entry__row dd a {
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid var(--orange);
  padding-bottom: 1px;
  transition: color 0.16s var(--ease);
}

.page-about .about-entry__row dd a:hover {
  color: var(--orange);
}

/* 术语悬浮 */
.page-about .about-term {
  position: relative;
  border-bottom: 1px dashed var(--sand);
  cursor: help;
}

.page-about .about-term::after {
  content: attr(data-def);
  position: absolute;
  left: 0;
  bottom: calc(100% + 8px);
  width: max-content;
  max-width: min(260px, calc(100vw - 48px));
  padding: 8px 10px;
  background: var(--ink-900);
  border: 1px solid var(--sand);
  color: var(--ice);
  font-family: var(--font-body);
  font-size: 12px;
  line-height: 1.55;
  letter-spacing: 0;
  text-transform: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: opacity 0.16s var(--ease), transform 0.16s var(--ease), visibility 0.16s;
  z-index: 6;
  white-space: normal;
  pointer-events: none;
}

.page-about .about-term:hover::after,
.page-about .about-term:focus-visible::after {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding-block: 60px;
  background: var(--ink-800);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-team__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-team__figure {
  margin: 0;
  border: 1px solid var(--line);
  overflow: hidden;
  aspect-ratio: 12 / 7;
  background: var(--ink-900);
}

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

.page-about .about-team__text h2 {
  margin: 12px 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 4.2vw, 40px);
  line-height: 1.12;
  color: var(--ice);
}

.page-about .about-team__text > p {
  margin: 0;
  color: var(--mist);
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .about-team__list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-team__list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-team__list b {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  line-height: 1.1;
  color: var(--sand);
  min-width: 2.4em;
  text-align: right;
}

.page-about .about-team__list span {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 内容生产 ---------- */
.page-about .about-flow {
  padding-block: 60px;
}

.page-about .about-flow__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  counter-reset: flow;
}

.page-about .about-flow__step {
  counter-increment: flow;
  position: relative;
  display: grid;
  gap: 7px;
  padding: 18px 18px 18px 20px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--orange);
  background: var(--ink-800);
  transition: border-color 0.16s var(--ease), transform 0.16s var(--ease);
}

.page-about .about-flow__step:hover {
  transform: translateY(-3px);
  border-color: var(--orange);
}

.page-about .about-flow__step::before {
  content: counter(flow, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .about-flow__step h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--ice);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 服务覆盖 ---------- */
.page-about .about-scale {
  padding-block: 60px;
  background: var(--ink-800);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-scale__grid {
  display: grid;
  gap: 26px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.page-about .about-scale__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(46px, 9vw, 78px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--sand);
}

.page-about .about-scale__num small {
  font-size: 0.4em;
  letter-spacing: 0;
  margin-left: 4px;
  color: var(--mist);
}

.page-about .about-scale__label {
  display: block;
  margin-top: 10px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-scale__note {
  margin: 26px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mint);
}

/* ---------- 荣誉 ---------- */
.page-about .about-honor {
  padding-block: 60px;
}

.page-about .about-honor__board {
  display: grid;
  gap: 12px;
  justify-items: start;
  padding: 24px 22px 24px 24px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--sand);
  background: linear-gradient(120deg, var(--card) 0%, var(--ink-800) 100%);
}

.page-about .about-honor__year {
  display: inline-block;
  padding: 3px 10px;
  background: var(--sand-soft);
  color: var(--sand);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  transform: rotate(-2deg);
}

.page-about .about-honor__board h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.8vw, 34px);
  line-height: 1.16;
  color: var(--ice);
}

.page-about .about-honor__board p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 接下来 ---------- */
.page-about .about-next {
  padding-block: 56px 60px;
}

.page-about .about-next__grid {
  display: grid;
  gap: 14px;
}

.page-about .about-next__card {
  padding: 22px 20px;
  border: 1px solid var(--line);
  background: var(--ink-800);
  transition: border-color 0.16s var(--ease), transform 0.16s var(--ease);
}

.page-about .about-next__card:hover {
  border-color: var(--sand);
  transform: translateY(-4px);
}

.page-about .about-next__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.25;
  color: var(--ice);
}

.page-about .about-next__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 下一步入口 ---------- */
.page-about .about-action {
  padding-block: 44px 76px;
  border-top: 1px solid var(--line);
}

.page-about .about-action__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 3.4vw, 30px);
  line-height: 1.2;
  color: var(--ice);
}

.page-about .about-action__links {
  display: grid;
  gap: 10px;
}

.page-about .about-action__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 16px;
  border: 1px solid var(--line);
  color: var(--ice);
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 15.5px;
  transition: border-color 0.16s var(--ease), background-color 0.16s var(--ease), color 0.16s var(--ease);
}

.page-about .about-action__link::after {
  content: "→";
  font-family: var(--font-mono);
  color: var(--orange);
  flex: none;
}

.page-about .about-action__link:hover {
  border-color: var(--orange);
  background: rgba(255, 106, 42, 0.08);
  color: var(--orange);
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-about .about-origin__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: center;
    gap: 36px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
    gap: 36px;
  }

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

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

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

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

/* ---------- 桌面 ---------- */
@media (min-width: 1000px) {
  .page-about .about-hero {
    padding-top: calc(var(--header-h, 84px) + 76px);
    padding-bottom: 84px;
    min-height: 66vh;
    display: flex;
    align-items: flex-end;
  }

  .page-about .about-hero__media img {
    opacity: 0.36;
  }

  .page-about .about-origin {
    padding-block: 84px 40px;
  }

  .page-about .about-timeline {
    padding-block: 48px 84px;
  }

  .page-about .about-timeline__list {
    --tl-rail: 80px;
    --tl-gap: 24px;
  }

  .page-about .about-entry__marker {
    font-size: 15px;
    padding-top: 19px;
  }

  .page-about .about-entry__summary {
    padding: 18px 22px;
  }

  .page-about .about-entry__body {
    padding: 18px 22px 22px;
  }

  .page-about .about-entry__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

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

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

  .page-about .about-flow__steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 10px;
  }

  .page-about .about-scale {
    padding-block: 76px;
  }

  .page-about .about-honor {
    padding-block: 76px;
  }

  .page-about .about-honor__board {
    padding: 34px 34px 34px 36px;
  }

  .page-about .about-next {
    padding-block: 76px 84px;
  }

  .page-about .about-action {
    padding-block: 56px 96px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-flow__step:hover,
  .page-about .about-next__card:hover,
  .page-about .about-term::after {
    transform: none;
  }
}
<<<END>>>