.page-about {
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 36px) 0 44px;
  background-color: var(--paper);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: .3;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -120px;
  right: -140px;
  width: 380px;
  height: 380px;
  background: radial-gradient(circle, rgba(232, 84, 47, .24), rgba(232, 84, 47, 0) 68%);
  pointer-events: none;
}

.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}

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

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  align-items: start;
}

.page-about .about-hero__kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--stone);
}

.page-about .about-hero__pulse {
  width: 10px;
  height: 10px;
  background: var(--orange);
  flex: none;
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(27px, 7vw, 56px);
  line-height: 1.1;
  letter-spacing: -0.01em;
}

.page-about .about-hero__leadline {
  margin: 0;
  max-width: 40em;
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.85;
  color: var(--stone);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 30px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.page-about .about-hero__num {
  display: block;
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(18px, 5vw, 28px);
  letter-spacing: -0.02em;
  color: var(--orange);
  line-height: 1.1;
}

.page-about .about-hero__cap {
  display: block;
  margin-top: 6px;
  font-family: var(--sans);
  font-size: 12px;
  line-height: 1.5;
  color: var(--stone);
}

.page-about .about-hero__aside {
  background: var(--ink);
  color: var(--paper);
  padding: 24px 20px 20px;
  border-top: 4px solid var(--orange);
}

.page-about .about-hero__asidetitle {
  margin: 0 0 16px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--orange-soft);
}

.page-about .about-hero__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-hero__list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid rgba(247, 243, 236, .16);
  font-family: var(--sans);
  font-size: 14px;
}

.page-about .about-hero__key {
  color: rgba(247, 243, 236, .75);
}

.page-about .about-hero__val {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--white);
  white-space: nowrap;
}

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

.page-about .about-hero__asidefoot-link {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
  transition: color var(--dur) var(--ease);
}

.page-about .about-hero__asidefoot-link:hover,
.page-about .about-hero__asidefoot-link:focus-visible {
  color: var(--orange-soft);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding: 56px 0;
}

.page-about .about-section__head {
  max-width: 46em;
  margin-bottom: 34px;
}

.page-about .about-section__num {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--orange);
}

.page-about .about-section__title {
  margin: 0 0 16px;
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(22px, 4.6vw, 38px);
  line-height: 1.22;
  letter-spacing: -0.01em;
}

.page-about .about-section__lead {
  margin: 0;
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.85;
  color: var(--stone);
}

/* ---------- 图片位 ---------- */
.page-about .about-shot {
  margin: 0;
}

.page-about .about-shot img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
  background-color: var(--white);
}

.page-about .about-shot figcaption {
  margin-top: 10px;
  padding-left: 10px;
  border-left: 2px solid var(--orange-soft);
  font-family: var(--sans);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 团队分工 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

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

.page-about .about-role {
  position: relative;
  padding: 20px 18px;
  background: var(--white);
  border: 1px solid var(--line);
  border-top: 3px solid var(--slate);
  outline: none;
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus,
.page-about .about-role:focus-within {
  border-color: var(--orange);
  border-top-color: var(--orange);
}

.page-about .about-role__num {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--orange);
}

.page-about .about-role__title {
  margin: 0 0 8px;
  font-family: var(--sans);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -0.01em;
}

.page-about .about-role__desc {
  margin: 0;
  font-family: var(--serif);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--stone);
}

.page-about .about-role__more {
  max-height: 0;
  margin-top: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 220ms var(--ease), opacity var(--dur) var(--ease), margin-top var(--dur) var(--ease);
}

.page-about .about-role:hover .about-role__more,
.page-about .about-role:focus .about-role__more,
.page-about .about-role:focus-within .about-role__more {
  max-height: 320px;
  margin-top: 14px;
  opacity: 1;
}

.page-about .about-role__more p {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-family: var(--serif);
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 34px 0 0;
  padding: 0 0 0 24px;
  border-left: 1px solid var(--line);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.page-about .about-flow__step {
  position: relative;
}

.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 5px;
  width: 9px;
  height: 9px;
  background: var(--orange);
}

.page-about .about-flow__num {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--orange);
}

.page-about .about-flow__title {
  margin: 0 0 8px;
  font-family: var(--sans);
  font-weight: 800;
  font-size: 16px;
}

.page-about .about-flow__text {
  margin: 0;
  font-family: var(--serif);
  font-size: 14px;
  line-height: 1.75;
  color: var(--stone);
}

.page-about .about-panels {
  margin-top: 42px;
  border-top: 1px solid var(--line);
}

.page-about .about-shot--flow {
  margin-top: 42px;
}

/* ---------- 历程 ---------- */
.page-about .about-timeline {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-about .about-timeline__rail {
  align-self: start;
  padding: 18px 16px;
  background: var(--white);
  border: 1px solid var(--line);
}

.page-about .about-timeline__railtitle {
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--stone);
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline__item + .about-timeline__item {
  margin-top: 4px;
}

.page-about .about-timeline__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 4px;
  font-family: var(--sans);
  font-size: 13.5px;
  color: var(--slate);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .about-timeline__dot {
  width: 8px;
  height: 8px;
  flex: none;
  background: var(--line);
  transition: background-color var(--dur) var(--ease);
}

.page-about .about-timeline__link:hover,
.page-about .about-timeline__link:focus-visible {
  color: var(--orange);
}

.page-about .about-timeline__link:hover .about-timeline__dot,
.page-about .about-timeline__link:focus-visible .about-timeline__dot {
  background: var(--orange);
}

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

.page-about .about-stage {
  position: relative;
  padding-left: 26px;
  border-left: 1px solid var(--line);
  margin-bottom: 42px;
  scroll-margin-top: calc(var(--header-h) + 24px);
}

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

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  background: var(--orange);
}

.page-about .about-stage:nth-child(2)::before {
  background: var(--teal);
}

.page-about .about-stage:nth-child(3)::before {
  background: var(--moss);
}

.page-about .about-stage:nth-child(4)::before {
  background: var(--clay);
}

.page-about .about-stage__tag {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--stone);
}

.page-about .about-stage__title {
  margin: 0 0 12px;
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(18px, 3.6vw, 24px);
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.page-about .about-stage__text {
  margin: 0 0 16px;
  max-width: 42em;
  font-family: var(--serif);
  font-size: 15px;
  line-height: 1.85;
  color: var(--stone);
}

.page-about .about-stage__points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-stage__points li {
  position: relative;
  padding-left: 18px;
  font-family: var(--sans);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .about-stage__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 9px;
  height: 1px;
  background: var(--orange);
}

.page-about .about-shot--stages {
  margin-top: 44px;
}

/* ---------- 读者覆盖 ---------- */
.page-about .about-reach {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-reach__cell {
  background: var(--white);
  padding: 22px 18px;
}

.page-about .about-reach__value {
  display: block;
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(22px, 5vw, 34px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-reach__label {
  display: block;
  margin-top: 10px;
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.6;
  color: var(--stone);
}

.page-about .about-reach__note {
  margin: 24px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--moss);
  max-width: 42em;
  font-family: var(--serif);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--stone);
}

/* ---------- 内容来源 ---------- */
.page-about .about-source__chart svg {
  display: block;
  width: 100%;
  height: 16px;
}

.page-about .about-source__seg--a { fill: var(--slate); }
.page-about .about-source__seg--b { fill: var(--moss); }
.page-about .about-source__seg--c { fill: var(--orange); }

.page-about .about-source__legend {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .about-source__legend li {
  border-top: 2px solid var(--line);
  padding-top: 14px;
}

.page-about .about-source__legend li:nth-child(1) { border-top-color: var(--slate); }
.page-about .about-source__legend li:nth-child(2) { border-top-color: var(--moss); }
.page-about .about-source__legend li:nth-child(3) { border-top-color: var(--orange); }

.page-about .about-source__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin: 0 0 8px;
}

.page-about .about-source__name {
  font-family: var(--sans);
  font-weight: 800;
  font-size: 15px;
  color: var(--ink);
}

.page-about .about-source__pct {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--stone);
}

.page-about .about-source__desc {
  margin: 0;
  font-family: var(--serif);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  padding: 56px 0;
  background: var(--ink);
  color: var(--paper);
}

.page-about .about-cta::after {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -90px;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(232, 84, 47, .32), rgba(232, 84, 47, 0) 70%);
  pointer-events: none;
}

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

.page-about .about-cta__title {
  margin: 0 0 16px;
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(22px, 4.4vw, 34px);
  line-height: 1.25;
  color: var(--white);
}

.page-about .about-cta__text {
  margin: 0 0 26px;
  max-width: 42em;
  font-family: var(--serif);
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(247, 243, 236, .78);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0 0 22px;
}

.page-about .about-cta__ghost {
  display: inline-flex;
  align-items: center;
  padding: 12px 20px;
  border: 1px solid rgba(247, 243, 236, .42);
  color: var(--paper);
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-cta__ghost:hover,
.page-about .about-cta__ghost:focus-visible {
  border-color: var(--orange);
  color: var(--orange-soft);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  margin: 0;
}

.page-about .about-cta__links .link-underline {
  font-family: var(--sans);
  font-size: 13.5px;
  color: var(--orange-soft);
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .about-role-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-source__chart svg {
    height: 20px;
  }
}

@media (min-width: 760px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 56px) 0 64px;
  }

  .page-about .about-source__legend {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 48px;
  }

  .page-about .about-section {
    padding: 92px 0;
  }

  .page-about .about-section__head {
    margin-bottom: 44px;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0;
    padding: 26px 0 0;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .page-about .about-flow__step {
    padding-right: 22px;
  }

  .page-about .about-flow__step::before {
    left: 0;
    top: -31px;
  }

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

  .page-about .about-cta {
    padding: 80px 0;
  }
}

@media (min-width: 1000px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 44px;
  }

  .page-about .about-timeline {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 64px;
  }

  .page-about .about-timeline__rail {
    position: sticky;
    top: calc(var(--header-h) + 26px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-role__more,
  .page-about .about-timeline__link,
  .page-about .about-timeline__dot,
  .page-about .about-cta__ghost,
  .page-about .about-hero__asidefoot-link {
    transition: none;
  }
}
<<<END>>>