.page-about {
  --about-edge: rgba(185, 174, 196, 0.72);
  --about-line: rgba(91, 44, 111, 0.16);
  display: block;
  background: var(--rice);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-head);
  margin: 0;
  color: var(--ink);
}

.page-about p {
  margin: 0;
}

.page-about ul,
.page-about ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--grape);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding: 18px 0 0;
  background: var(--mist);
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--graphite);
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--vine);
}

.page-about .breadcrumb-link {
  color: var(--grape);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  border-bottom-color: var(--grape);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  background: linear-gradient(180deg, var(--mist) 0%, var(--rice) 100%);
  border-bottom: 1px solid var(--about-edge);
  padding: 28px 0 44px;
}

.page-about .about-hero__aside {
  border-left: 3px solid var(--grape);
  padding: 4px 0 4px 16px;
  margin-bottom: 26px;
}

.page-about .about-hero__stamp {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--grape-deep);
}

.page-about .about-hero__place {
  margin-top: 10px;
  font-size: 14px;
  color: var(--graphite);
}

.page-about .about-hero h1 {
  font-size: 29px;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: 0.01em;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--cinnabar);
  display: inline-block;
}

.page-about .about-hero__lede {
  margin-top: 20px;
  font-size: 17px;
  line-height: 1.85;
  color: var(--graphite);
  max-width: 62ch;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 28px;
  background: var(--about-edge);
  border: 1px solid var(--about-edge);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-stats .stat {
  background: var(--paper);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-stats .stat-num {
  font-family: var(--font-mono);
  font-size: 25px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--grape);
}

.page-about .about-stats .stat-label {
  font-size: 13px;
  color: var(--graphite);
  line-height: 1.5;
}

/* ---------- 三种形态 ---------- */
.page-about .about-channel {
  background: var(--rice);
}

.page-about .channel-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 26px;
}

.page-about .channel-card {
  position: relative;
  background: var(--paper);
  border: 1px solid var(--about-edge);
  border-left: 4px solid var(--grape);
  border-radius: var(--radius);
  padding: 20px 20px 22px;
  box-shadow: var(--shadow-card);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .channel-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lift);
}

.page-about .channel-card__k {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--paper);
  background: var(--grape);
  border-radius: 3px;
  padding: 2px 8px;
}

.page-about .channel-card__t {
  margin-top: 12px;
  font-size: 20px;
  font-weight: 600;
  color: var(--grape-deep);
}

.page-about .channel-card p {
  margin-top: 8px;
  font-size: 15px;
  color: var(--graphite);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  background: var(--paper);
  border-top: 1px solid var(--about-edge);
  border-bottom: 1px solid var(--about-edge);
}

.page-about .timeline {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 30px;
}

.page-about .timeline__index {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  -webkit-overflow-scrolling: touch;
}

.page-about .timeline__index-link {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  color: var(--grape);
  border: 1px solid var(--about-edge);
  background: var(--mist);
  border-radius: 999px;
  padding: 4px 14px;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .timeline__index-link:hover,
.page-about .timeline__index-link:focus-visible {
  background: var(--grape);
  color: var(--paper);
}

.page-about .timeline__vine {
  margin: 22px 0 0;
}

.page-about .timeline__vine .figure-media {
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--about-edge);
  background: var(--mist);
  max-height: 240px;
}

.page-about .timeline__vine img {
  display: block;
  width: 100%;
  height: 240px;
  object-fit: cover;
  object-position: center top;
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 30px 26px;
  border-left: 1px solid var(--about-edge);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -6.5px;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--grape);
}

.page-about .timeline__item:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--grape);
}

.page-about .timeline__title {
  margin-top: 10px;
  font-size: 20px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .timeline__desc {
  margin-top: 8px;
  font-size: 16px;
  color: var(--graphite);
  max-width: 60ch;
}

.page-about .timeline__details {
  margin-top: 12px;
  border: 1px solid var(--about-edge);
  border-radius: var(--radius);
  background: var(--mist);
  overflow: hidden;
  max-width: 60ch;
}

.page-about .timeline__details summary {
  cursor: pointer;
  list-style: none;
  padding: 9px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--grape-deep);
}

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

.page-about .timeline__details summary::after {
  content: "＋";
  float: right;
  font-weight: 700;
  color: var(--cinnabar);
}

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

.page-about .timeline__details p {
  padding: 0 14px 14px;
  font-size: 15px;
  color: var(--graphite);
  border-top: 1px dashed var(--about-edge);
  padding-top: 12px;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--rice);
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 26px;
}

.page-about .team-card {
  background: var(--paper);
  border: 1px solid var(--about-edge);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-card);
}

.page-about .team-card:nth-child(even) {
  background: var(--mist);
}

.page-about .team-card .index-number {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  color: var(--vine);
}

.page-about .team-card .card-title {
  margin-top: 10px;
  font-size: 19px;
  font-weight: 600;
  color: var(--grape-deep);
}

.page-about .team-card .card-note {
  margin-top: 8px;
  font-size: 15px;
  color: var(--graphite);
}

/* ---------- 复核流程 ---------- */
.page-about .about-review {
  background: var(--paper);
  border-top: 1px solid var(--about-edge);
  border-bottom: 1px solid var(--about-edge);
}

.page-about .review-figure {
  margin: 26px 0 30px;
}

.page-about .figure-media {
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--about-edge);
  background: var(--mist);
}

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

.page-about .figure-caption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--grape-grey);
  font-family: var(--font-mono);
}

.page-about .review-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .review-step {
  position: relative;
  background: var(--rice);
  border: 1px solid var(--about-edge);
  border-top: 3px solid var(--grape);
  border-radius: var(--radius);
  padding: 20px 20px 22px;
  transition: border-top-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .review-step:hover,
.page-about .review-step:focus-within {
  border-top-color: var(--cinnabar);
  box-shadow: var(--shadow-card);
}

.page-about .review-step__no {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  font-weight: 700;
  color: var(--cinnabar);
}

.page-about .review-step h3 {
  margin-top: 8px;
  font-size: 20px;
  font-weight: 600;
}

.page-about .review-step p {
  margin-top: 10px;
  font-size: 15px;
  color: var(--graphite);
}

.page-about .review-step__out {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--grape);
  border-top: 1px dashed var(--about-edge);
  padding-top: 10px;
}

/* ---------- 合作与覆盖 ---------- */
.page-about .about-reach {
  background: var(--rice);
}

.page-about .reach-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-top: 26px;
}

.page-about .reach-figure {
  margin: 0;
}

.page-about .reach-lede {
  font-size: 17px;
  color: var(--ink);
  max-width: 58ch;
}

.page-about .reach-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-about .reach-tag {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  color: var(--grape-deep);
  background: var(--mist);
  border: 1px solid var(--about-edge);
  border-radius: 4px;
  padding: 6px 12px;
}

.page-about .reach-tag span {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  color: var(--graphite);
}

.page-about .reach-tag--lead {
  background: var(--grape);
  color: var(--paper);
  border-color: var(--grape-deep);
}

.page-about .reach-tag--lead span {
  color: var(--mist);
}

.page-about .reach-note {
  margin-top: 20px;
  font-size: 15px;
  color: var(--graphite);
  border-left: 3px solid var(--moss);
  padding-left: 14px;
}

.page-about .reach-body .link-more {
  display: inline-block;
  margin-top: 18px;
  font-size: 15px;
  font-weight: 600;
  color: var(--cinnabar);
  text-decoration: none;
  border-bottom: 1px solid var(--cinnabar);
}

.page-about .reach-body .link-more:hover,
.page-about .reach-body .link-more:focus-visible {
  color: var(--grape);
  border-bottom-color: var(--grape);
}

/* ---------- 更新节奏 ---------- */
.page-about .update-rhythm {
  background: linear-gradient(135deg, var(--grape-deep) 0%, var(--grape) 100%);
  color: var(--rice);
  border-top: 4px solid var(--cinnabar);
}

.page-about .update-rhythm .eyebrow {
  color: var(--vine);
}

.page-about .update-rhythm .section-title {
  color: var(--rice);
}

.page-about .update-rhythm .section-note {
  color: rgba(245, 240, 232, 0.78);
}

.page-about .rhythm-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 26px;
}

.page-about .rhythm-card {
  background: rgba(245, 240, 232, 0.06);
  border: 1px solid var(--vine);
  border-radius: var(--radius);
  padding: 20px;
}

.page-about .rhythm-card__cycle {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--grape-deep);
  background: var(--rice);
  border-radius: 3px;
  padding: 3px 10px;
}

.page-about .rhythm-card h3 {
  margin-top: 14px;
  font-size: 20px;
  font-weight: 600;
  color: var(--rice);
}

.page-about .rhythm-card p {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245, 240, 232, 0.82);
}

/* ---------- 下一步入口 ---------- */
.page-about .about-next {
  background: var(--mist);
}

.page-about .next-links {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 24px;
}

.page-about .next-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-decoration: none;
  background: var(--paper);
  border: 1px solid var(--about-edge);
  border-left: 4px solid var(--cinnabar);
  border-radius: var(--radius);
  padding: 16px 18px;
  transition: transform var(--dur) var(--ease), border-left-color var(--dur) var(--ease);
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  transform: translateX(4px);
  border-left-color: var(--grape);
}

.page-about .next-link__k {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 600;
  color: var(--grape-deep);
}

.page-about .next-link__v {
  font-size: 14px;
  color: var(--graphite);
  line-height: 1.7;
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .about-hero {
    padding: 36px 0 54px;
  }

  .page-about .about-hero h1 {
    font-size: 34px;
  }

  .page-about .channel-grid,
  .page-about .review-steps,
  .page-about .rhythm-grid,
  .page-about .next-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 980px) {
  .page-about {
    font-size: 17px;
  }

  .page-about .about-hero h1 {
    font-size: 40px;
  }

  .page-about .about-hero__aside {
    margin-bottom: 0;
  }

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

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

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

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

  .page-about .next-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .reach-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 32px;
    align-items: start;
  }

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

  .page-about .timeline {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

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

  .page-about .timeline__index {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .timeline__index-link {
    border-radius: 4px;
    text-align: center;
  }

  .page-about .timeline__vine {
    margin-top: 16px;
  }

  .page-about .timeline__vine .figure-media {
    max-height: 380px;
  }

  .page-about .timeline__vine img {
    height: 380px;
  }

  .page-about .timeline__item {
    padding-left: 32px;
    padding-bottom: 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .channel-card,
  .page-about .review-step,
  .page-about .next-link,
  .page-about .timeline__index-link {
    transition: none;
  }

  .page-about .channel-card:hover,
  .page-about .next-link:hover,
  .page-about .next-link:focus-visible {
    transform: none;
  }
}
<<<END>>>