.page-about {
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  padding-top: calc(var(--bar-h) + 16px);
  padding-left: 20px;
  padding-right: 20px;
  font-size: .8rem;
  color: var(--stone);
}

.page-about .breadcrumb a {
  color: var(--lake);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  color: var(--sunset);
}

.page-about .breadcrumb-sep {
  margin: 0 6px;
  color: var(--stone);
}

/* ---------- hero ---------- */

.page-about .about-hero {
  position: relative;
  padding: 28px 0 48px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -6%;
  right: 0;
  width: 78%;
  height: 112%;
  background: linear-gradient(165deg, rgba(220, 239, 242, .95), rgba(247, 217, 198, .55) 62%, rgba(248, 245, 236, 0) 100%);
  clip-path: polygon(26% 0, 100% 0, 100% 100%, 0 100%);
  z-index: 0;
  pointer-events: none;
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--sunset);
  margin: 0 0 12px;
}

.page-about .eyebrow--light {
  color: var(--sunset-pale);
}

.page-about .about-hero__title {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(1.9rem, 7vw, 3.4rem);
  line-height: 1.22;
  letter-spacing: .03em;
  margin: 0 0 18px;
  color: var(--ink);
  max-width: 14em;
}

.page-about .about-hero__lede {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink);
  max-width: 34em;
  margin: 0 0 26px;
}

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

.page-about .about-figures {
  background: var(--lake-deep);
  color: var(--paper);
  padding: 26px 22px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px 16px;
}

.page-about .about-figure {
  display: flex;
  flex-direction: column;
  gap: 6px;
  border-top: 1px solid var(--hairline-light);
  padding-top: 12px;
}

.page-about .about-figure__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.9rem;
  line-height: 1;
  color: var(--sunset-pale);
}

.page-about .about-figure__label {
  font-size: .78rem;
  line-height: 1.5;
  color: rgba(248, 245, 236, .8);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-section {
  padding: 52px 0;
  position: relative;
}

.page-about .about-section--mist {
  background: var(--lake-mist);
}

.page-about .about-section--warm {
  background: var(--sunset-pale);
}

.page-about .about-section--deep {
  background: var(--lake-deep);
  color: var(--paper);
  background-image:
    repeating-linear-gradient(0deg, rgba(248, 245, 236, .04) 0 1px, transparent 1px 6px);
}

.page-about .section-title {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(1.4rem, 4.6vw, 2rem);
  line-height: 1.35;
  letter-spacing: .02em;
  margin: 0 0 16px;
}

.page-about .section-title--light {
  color: var(--paper);
}

.page-about .about-intro {
  max-width: 34em;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--ink);
  margin: 0 0 28px;
}

.page-about .about-subtitle {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: .04em;
  margin: 30px 0 14px;
  padding-left: 12px;
  border-left: 3px solid var(--sunset);
}

/* ---------- 起点章节 ---------- */

.page-about .about-origin {
  display: grid;
  gap: 32px;
}

.page-about .about-rail {
  background: rgba(248, 245, 236, .72);
  border: 1px solid var(--hairline);
  padding: 22px 20px;
}

.page-about .about-rail__kicker {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--stone);
  margin: 0 0 8px;
}

.page-about .about-rail__name {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 1.3rem;
  letter-spacing: .04em;
  margin: 0 0 10px;
  color: var(--lake-deep);
}

.page-about .about-rail__text {
  font-size: .88rem;
  line-height: 1.8;
  color: var(--stone);
  margin: 0 0 18px;
}

.page-about .about-rail__nav {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--hairline);
}

.page-about .about-rail__nav a {
  display: block;
  padding: 9px 0 9px 12px;
  font-size: .84rem;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--hairline);
  position: relative;
  transition: color .16s var(--ease), padding-left .16s var(--ease);
}

.page-about .about-rail__nav a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 0;
  height: 1px;
  background: var(--sunset);
  transform: translateY(-50%);
  transition: width .16s var(--ease);
}

.page-about .about-rail__nav a:hover,
.page-about .about-rail__nav a:focus-visible {
  color: var(--lake);
  padding-left: 18px;
}

.page-about .about-rail__nav a:hover::before,
.page-about .about-rail__nav a:focus-visible::before {
  width: 10px;
}

.page-about .about-narrative p {
  font-size: .95rem;
  line-height: 1.9;
  margin: 0 0 16px;
  max-width: 36em;
}

.page-about .about-figure-block {
  margin: 26px 0 0;
}

.page-about .media-frame {
  overflow: hidden;
  background:
    repeating-linear-gradient(135deg, rgba(16, 43, 54, .07) 0 1px, transparent 1px 9px),
    var(--lake-mist);
  border: 1px solid var(--hairline);
}

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

.page-about .media-frame--wide img {
  aspect-ratio: 16 / 10;
}

.page-about .media-frame--tall img {
  aspect-ratio: 4 / 5;
}

.page-about .media-caption {
  font-size: .78rem;
  line-height: 1.7;
  color: var(--stone);
  margin-top: 8px;
}

.page-about .about-points {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-points li {
  font-size: .9rem;
  line-height: 1.8;
  padding: 14px 16px;
  background: rgba(248, 245, 236, .8);
  border-left: 3px solid var(--barley);
  color: var(--ink);
}

.page-about .tag {
  display: inline-block;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: .72rem;
  letter-spacing: .06em;
  padding: 3px 8px;
  margin-right: 8px;
  vertical-align: 1px;
}

.page-about .tag--green {
  background: var(--barley);
  color: var(--paper);
}

/* ---------- 团队 ---------- */

.page-about .about-team-media {
  margin: 0 0 28px;
}

.page-about .role-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .role-card {
  background: var(--paper);
  border: 1px solid var(--hairline);
  padding: 20px 18px;
  transition: transform .18s var(--ease), border-color .18s var(--ease), box-shadow .18s var(--ease);
}

.page-about .role-card:hover {
  transform: translateY(-3px);
  border-color: var(--lake);
  box-shadow: 0 8px 22px rgba(10, 74, 94, .09);
}

.page-about .role-card:focus-within {
  outline: 2px solid var(--sunset);
  outline-offset: 2px;
}

.page-about .role-card__count {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--sunset);
  margin: 0 0 10px;
}

.page-about .role-card__name {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1rem;
  margin: 0 0 8px;
  color: var(--lake-deep);
}

.page-about .role-card__desc {
  font-size: .86rem;
  line-height: 1.8;
  color: var(--stone);
  margin: 0 0 12px;
}

.page-about .link-arrow {
  display: inline-block;
  font-size: .82rem;
  color: var(--lake);
  text-decoration: none;
  border-bottom: 1px solid rgba(19, 122, 147, .35);
  padding-bottom: 1px;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

.page-about .link-arrow::after {
  content: " →";
}

.page-about .link-arrow:hover,
.page-about .link-arrow:focus-visible {
  color: var(--sunset);
  border-color: var(--sunset);
}

/* ---------- 时间线 ---------- */

.page-about .about-contour {
  display: block;
  width: 100%;
  height: 34px;
  color: rgba(227, 107, 44, .5);
  margin-bottom: 8px;
}

.page-about .about-timeline-grid {
  display: grid;
  gap: 34px;
}

.page-about .timeline-rail__text {
  font-size: .92rem;
  line-height: 1.85;
  color: rgba(248, 245, 236, .78);
  max-width: 26em;
  margin: 0 0 22px;
}

.page-about .timeline-media {
  border-color: var(--hairline-light);
  background:
    repeating-linear-gradient(135deg, rgba(248, 245, 236, .08) 0 1px, transparent 1px 9px),
    rgba(248, 245, 236, .05);
}

.page-about .about-timeline {
  list-style: none;
  margin: 4px 0 0;
  padding: 0 0 0 24px;
  border-left: 1px solid var(--hairline-light);
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 30px;
}

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

.page-about .tl-dot {
  position: absolute;
  left: -28px;
  top: 6px;
  width: 8px;
  height: 8px;
  background: var(--sunset);
  transition: transform .18s var(--ease);
}

.page-about .tl-item:hover .tl-dot,
.page-about .tl-item:focus-within .tl-dot {
  transform: scale(1.7);
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: .92rem;
  letter-spacing: .12em;
  color: var(--sunset-pale);
  margin: 0 0 6px;
}

.page-about .tl-title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1rem;
  margin: 0 0 6px;
  color: var(--paper);
}

.page-about .tl-text {
  font-size: .86rem;
  line-height: 1.8;
  color: rgba(248, 245, 236, .76);
  margin: 0;
  max-width: 30em;
}

.page-about .tl-item:hover .tl-text {
  color: var(--paper);
}

/* ---------- 流程 ---------- */

.page-about .flow-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .flow-step {
  background: var(--paper);
  border-top: 3px solid var(--sunset);
  padding: 18px 16px 20px;
  transition: transform .18s var(--ease), box-shadow .18s var(--ease);
}

.page-about .flow-step:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(10, 74, 94, .1);
}

.page-about .flow-step__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: .95rem;
  letter-spacing: .1em;
  color: var(--sunset);
  margin: 0 0 10px;
}

.page-about .flow-step__title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: .96rem;
  margin: 0 0 8px;
  color: var(--lake-deep);
}

.page-about .flow-step__text {
  font-size: .84rem;
  line-height: 1.8;
  color: var(--stone);
  margin: 0;
}

/* ---------- 覆盖与合作 ---------- */

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

.page-about .reach-list {
  margin: 0;
  border-top: 1px solid var(--hairline);
}

.page-about .reach-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 6px 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--hairline);
}

.page-about .reach-row dt {
  font-size: .82rem;
  letter-spacing: .06em;
  color: var(--stone);
}

.page-about .reach-row dd {
  margin: 0;
  font-size: .9rem;
  color: var(--ink);
}

.page-about .reach-row .num {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--lake);
}

.page-about .about-coop {
  border: 1px solid var(--hairline);
  background: var(--lake-mist);
  margin-bottom: 16px;
}

.page-about .about-coop summary {
  cursor: pointer;
  padding: 16px 18px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: .92rem;
  color: var(--lake-deep);
  list-style: none;
  position: relative;
  padding-right: 44px;
}

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

.page-about .about-coop summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--sunset);
  transition: transform .18s var(--ease);
}

.page-about .about-coop[open] summary::after {
  content: "−";
}

.page-about .about-coop summary:focus-visible {
  outline: 2px solid var(--sunset);
  outline-offset: -2px;
}

.page-about .about-coop__body {
  padding: 0 18px 18px;
  border-top: 1px solid var(--hairline);
}

.page-about .about-coop__body h3 {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: .88rem;
  color: var(--saffron);
  margin: 16px 0 6px;
}

.page-about .about-coop__body p {
  font-size: .84rem;
  line-height: 1.8;
  color: var(--ink);
  margin: 0;
}

.page-about .field-note {
  margin-top: 14px;
  font-size: .78rem;
  color: var(--stone);
}

/* ---------- 反馈 ---------- */

.page-about .about-quote {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(1.05rem, 3.6vw, 1.35rem);
  line-height: 1.7;
  letter-spacing: .02em;
  color: var(--lake-deep);
  border-left: 3px solid var(--sunset);
  padding: 4px 0 4px 18px;
  margin: 0 0 30px;
  max-width: 30em;
}

.page-about .about-quote cite {
  display: block;
  margin-top: 10px;
  font-family: var(--font-sans);
  font-style: normal;
  font-weight: 400;
  font-size: .8rem;
  color: var(--stone);
}

.page-about .voice-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 26px;
}

.page-about .voice-card {
  background: var(--paper);
  border: 1px solid var(--hairline);
  padding: 18px 16px;
}

.page-about .voice-card__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.7rem;
  line-height: 1.1;
  color: var(--lake);
  margin: 0 0 8px;
}

.page-about .voice-card__text {
  font-size: .84rem;
  line-height: 1.8;
  color: var(--stone);
  margin: 0;
}

.page-about .about-closing {
  font-size: .92rem;
  line-height: 1.9;
  color: var(--ink);
  max-width: 36em;
  margin: 0 0 12px;
}

/* ---------- 出口 ---------- */

.page-about .about-links {
  background: var(--paper);
  border-top: 1px solid var(--hairline);
}

.page-about .about-link-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-link-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  border: 1px solid var(--hairline);
  text-decoration: none;
  background: var(--paper);
  transition: background-color .18s var(--ease), border-color .18s var(--ease), transform .18s var(--ease);
}

.page-about .about-link-card:hover,
.page-about .about-link-card:focus-visible {
  background: var(--lake-mist);
  border-color: var(--lake);
  transform: translateY(-2px);
}

.page-about .about-link-card__label {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: .95rem;
  color: var(--lake-deep);
}

.page-about .about-link-card__text {
  font-size: .82rem;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 桌面 ---------- */

@media (min-width: 768px) {
  .page-about .breadcrumb {
    padding-left: 32px;
    padding-right: 32px;
  }

  .page-about .about-hero {
    padding: 48px 0 64px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 1.35fr .8fr;
    align-items: end;
    gap: 44px;
  }

  .page-about .about-figures {
    padding: 30px 26px;
  }

  .page-about .about-section {
    padding: 78px 0;
  }

  .page-about .about-origin {
    grid-template-columns: 32fr 68fr;
    gap: 46px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--bar-h) + 24px);
  }

  .page-about .role-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .page-about .role-card:nth-child(even) {
    margin-top: 34px;
  }

  .page-about .about-timeline-grid {
    grid-template-columns: 34fr 66fr;
    gap: 52px;
    align-items: start;
  }

  .page-about .flow-steps {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
  }

  .page-about .reach-grid {
    grid-template-columns: 62fr 38fr;
    gap: 46px;
    align-items: start;
  }

  .page-about .voice-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }

  .page-about .about-link-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.45fr .75fr;
    gap: 60px;
  }

  .page-about .role-grid {
    gap: 24px;
  }

  .page-about .about-coop summary {
    padding: 18px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role-card,
  .page-about .flow-step,
  .page-about .about-link-card,
  .page-about .tl-dot,
  .page-about .about-rail__nav a {
    transition: none;
  }

  .page-about .role-card:hover,
  .page-about .flow-step:hover,
  .page-about .about-link-card:hover,
  .page-about .about-link-card:focus-visible {
    transform: none;
  }
}
<<<END>>>