.page-about {
  --about-hair: rgba(143, 163, 155, 0.26);
  --about-text-dim: rgba(247, 241, 228, 0.74);
  background: var(--se-ink);
  color: var(--se-warm-white);
  font-family: var(--se-sans);
  font-size: var(--se-fs-16);
  line-height: 1.75;
  padding-bottom: 80px;
  overflow-x: hidden;
}

.page-about .img-frame {
  display: block;
  margin: 0;
  border: 1px solid var(--about-hair);
  border-radius: var(--se-radius);
  overflow: hidden;
  background: var(--se-ink-layer);
}

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

.page-about .img-frame figcaption {
  padding: 10px 14px;
  font-size: var(--se-fs-12);
  color: var(--se-neutral);
  border-top: 1px solid var(--about-hair);
  background: var(--se-ink-layer);
}

.page-about .mono {
  font-family: var(--se-mono);
  font-variant-numeric: tabular-nums;
}

/* 面包屑 */
.about-crumb {
  max-width: var(--se-maxw);
  margin: 0 auto;
  padding: 26px var(--se-gutter) 0;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: var(--se-fs-12);
  color: var(--se-neutral);
}

.about-crumb a {
  color: var(--se-neutral);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms var(--se-ease), border-color 180ms var(--se-ease);
}

.about-crumb a:hover,
.about-crumb a:focus-visible {
  color: var(--se-gold);
  border-bottom-color: var(--se-gold);
}

.about-crumb__chapter {
  margin-left: auto;
  color: var(--se-gold);
  letter-spacing: 0.1em;
  font-size: var(--se-fs-12);
}

/* 通用区段 */
.about-sec {
  max-width: var(--se-maxw);
  margin: 0 auto;
  padding: 52px var(--se-gutter) 0;
}

.about-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-hair);
}

.about-head__num {
  font-family: var(--se-mono);
  font-size: var(--se-fs-28);
  line-height: 1;
  color: var(--se-cinnabar);
  letter-spacing: 0.02em;
  flex: none;
}

.about-head__title {
  margin: 0;
  font-family: var(--se-serif);
  font-size: var(--se-fs-20);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--se-warm-white);
}

.about-sec__lede {
  margin: 16px 0 0;
  max-width: 62ch;
  color: var(--about-text-dim);
  font-size: var(--se-fs-16);
}

/* 章节色带 */
.about-band {
  height: 6px;
  margin-top: 48px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--se-cinnabar) 10%,
    var(--se-gold) 28%,
    var(--se-paper-deep) 42%,
    rgba(110, 140, 160, 0.5) 55%,
    transparent 100%
  );
  opacity: 0.85;
}

/* 首屏 */
.about-hero {
  display: grid;
  gap: 34px;
  padding-top: 34px;
}

.about-seal {
  width: 72px;
  height: 72px;
  display: block;
  margin-bottom: 20px;
}

.about-seal rect {
  fill: none;
  stroke: var(--se-cinnabar);
  stroke-width: 5;
}

.about-seal .about-seal__inner {
  stroke-width: 1.5;
  stroke-dasharray: 6 5;
  opacity: 0.65;
}

.about-seal .about-seal__glyph {
  fill: var(--se-cinnabar);
  font-family: var(--se-serif);
  font-size: 34px;
  font-weight: 700;
}

.about-hero__h1 {
  margin: 0;
  font-family: var(--se-serif);
  font-size: clamp(26px, 6.2vw, 40px);
  font-weight: 800;
  line-height: 1.32;
  letter-spacing: 0.02em;
  color: var(--se-warm-white);
}

.about-hero__statement {
  margin: 18px 0 0;
  font-family: var(--se-serif);
  font-size: var(--se-fs-16);
  letter-spacing: 0.28em;
  color: var(--se-paper-deep);
  opacity: 0.85;
}

.about-hero__lede {
  margin: 18px 0 0;
  max-width: 46ch;
  color: var(--about-text-dim);
  border-left: 2px solid var(--se-gold);
  padding-left: 14px;
}

.about-hero__aside {
  display: grid;
  gap: 18px;
  align-content: start;
}

.about-file {
  margin: 0;
  border-top: 1px solid var(--about-hair);
}

.about-file__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--about-hair);
}

.about-file__row dt {
  font-size: var(--se-fs-14);
  color: var(--se-neutral);
}

.about-file__row dd {
  margin: 0;
  font-size: var(--se-fs-14);
  color: var(--se-gold);
  letter-spacing: 0.04em;
}

/* 团队分工 */
.about-team {
  display: grid;
  gap: 16px;
  margin-top: 26px;
}

.about-team__card {
  min-width: 0;
  padding: 22px 20px 20px;
  background: var(--se-paper);
  color: var(--se-coal);
  border: 1px solid var(--se-paper-deep);
  border-top: 4px solid var(--se-cinnabar);
  border-radius: var(--se-radius);
  box-shadow: 0 16px 30px -22px rgba(0, 0, 0, 0.95), 0 3px 0 rgba(8, 13, 11, 0.35);
}

.about-team__card--b {
  border-top-color: var(--se-gold);
}

.about-team__card--c {
  border-top-color: var(--se-blue);
}

.about-team__count {
  display: inline-block;
  font-size: var(--se-fs-12);
  letter-spacing: 0.14em;
  color: var(--se-cinnabar);
  padding: 2px 8px;
  border: 1px solid rgba(200, 50, 43, 0.4);
  border-radius: var(--se-radius);
}

.about-team__card--b .about-team__count {
  color: #8a6417;
  border-color: rgba(217, 160, 60, 0.55);
}

.about-team__card--c .about-team__count {
  color: #3f5c70;
  border-color: rgba(110, 140, 160, 0.55);
}

.about-team__card h3 {
  margin: 12px 0 8px;
  font-family: var(--se-serif);
  font-size: var(--se-fs-20);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.about-team__card p {
  margin: 0 0 10px;
  font-size: var(--se-fs-14);
  line-height: 1.72;
  color: rgba(8, 13, 11, 0.78);
}

.about-team__out {
  margin: 0;
  padding-top: 10px;
  border-top: 1px solid rgba(8, 13, 11, 0.14);
  font-size: var(--se-fs-12);
  color: var(--se-blue);
  letter-spacing: 0.02em;
}

.about-team__link {
  display: inline-block;
  margin-top: 12px;
  font-size: var(--se-fs-14);
  color: #8a6417;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.about-team__link:hover,
.about-team__link:focus-visible {
  color: var(--se-cinnabar);
}

.about-team__figure {
  margin-top: 26px;
}

/* 时间线 */
.about-timeline {
  position: relative;
  margin: 28px 0 0;
  padding: 0 0 0 32px;
  list-style: none;
}

.about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--se-cinnabar) 0%, rgba(200, 50, 43, 0.5) 55%, rgba(200, 50, 43, 0.06) 100%);
}

.about-timeline__item {
  position: relative;
  padding-bottom: 28px;
}

.about-timeline__item:last-child {
  padding-bottom: 0;
}

.about-timeline__item::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 8px;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  border: 2px solid var(--se-cinnabar);
  border-radius: 50%;
  background: var(--se-ink);
}

.about-timeline__year {
  display: inline-block;
  font-size: var(--se-fs-14);
  letter-spacing: 0.1em;
  color: var(--se-gold);
}

.about-timeline__body h3 {
  margin: 4px 0 6px;
  font-family: var(--se-serif);
  font-size: var(--se-fs-20);
  font-weight: 700;
  color: var(--se-warm-white);
}

.about-timeline__body p {
  margin: 0;
  max-width: 60ch;
  font-size: var(--se-fs-14);
  color: var(--about-text-dim);
}

/* 校准流程 */
.about-cal {
  display: grid;
  gap: 30px;
  margin-top: 26px;
}

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

.about-flow li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--about-hair);
}

.about-flow li:last-child {
  border-bottom: 1px solid var(--about-hair);
}

.about-flow__n {
  font-size: var(--se-fs-14);
  color: var(--se-cinnabar);
  letter-spacing: 0.08em;
  padding-top: 2px;
}

.about-flow h3 {
  margin: 0 0 4px;
  font-family: var(--se-serif);
  font-size: var(--se-fs-16);
  font-weight: 700;
  color: var(--se-warm-white);
  letter-spacing: 0.04em;
}

.about-flow p {
  margin: 0;
  font-size: var(--se-fs-14);
  color: var(--about-text-dim);
}

/* 合作生态 */
.about-coop {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.about-coop__row {
  display: grid;
  grid-template-columns: minmax(0, 96px) minmax(0, 1fr);
  align-items: baseline;
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--about-hair);
}

.about-coop__row:last-child {
  border-bottom: 1px solid var(--about-hair);
}

.about-coop__num {
  font-family: var(--se-serif);
  font-size: var(--se-fs-28);
  font-weight: 700;
  line-height: 1.1;
  color: var(--se-gold);
  letter-spacing: 0.02em;
}

.about-coop__txt {
  font-size: var(--se-fs-14);
  color: var(--about-text-dim);
}

.about-coop__note {
  margin-top: 22px;
  padding: 20px;
  background: var(--se-ink-layer);
  border-left: 3px solid var(--se-blue);
  border-radius: var(--se-radius);
}

.about-coop__note p {
  margin: 0;
  font-size: var(--se-fs-16);
  color: var(--aspect-text, var(--about-text-dim));
  max-width: 64ch;
}

.about-coop__link {
  display: inline-block;
  margin-top: 14px;
  font-size: var(--se-fs-14);
  color: var(--se-blue);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.about-coop__link:hover,
.about-coop__link:focus-visible {
  color: var(--se-gold);
}

/* 三条做法 */
.about-keeps {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 22px;
}

.about-keeps__item {
  position: relative;
  padding: 6px 0 6px 22px;
  border-left: 2px solid rgba(200, 50, 43, 0.55);
}

.about-keeps__n {
  display: block;
  font-size: var(--se-fs-12);
  letter-spacing: 0.14em;
  color: var(--se-cinnabar);
}

.about-keeps__item h3 {
  margin: 6px 0 8px;
  font-family: var(--se-serif);
  font-size: var(--se-fs-20);
  font-weight: 700;
  color: var(--se-warm-white);
}

.about-keeps__item p {
  margin: 0;
  max-width: 62ch;
  font-size: var(--se-fs-14);
  color: var(--about-text-dim);
}

/* 收尾 */
.about-close {
  margin-top: 56px;
  padding-top: 44px;
  border-top: 1px solid var(--se-gold);
}

.about-close__kicker {
  margin: 0;
  font-size: var(--se-fs-12);
  letter-spacing: 0.22em;
  color: var(--se-gold);
}

.about-close__title {
  margin: 12px 0 0;
  font-family: var(--se-serif);
  font-size: clamp(22px, 4.6vw, 32px);
  font-weight: 800;
  line-height: 1.36;
  color: var(--se-warm-white);
  max-width: 22ch;
}

.about-close__txt {
  margin: 14px 0 0;
  max-width: 60ch;
  color: var(--about-text-dim);
  font-size: var(--se-fs-16);
}

.about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.about-top {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 32px;
  padding: 10px 16px;
  border: 1px solid var(--se-cinnabar);
  border-radius: var(--se-radius);
  color: var(--se-cinnabar);
  text-decoration: none;
  font-size: var(--se-fs-14);
  letter-spacing: 0.08em;
  transition: background-color 180ms var(--se-ease), color 180ms var(--se-ease);
}

.about-top:hover,
.about-top:focus-visible {
  background: var(--se-cinnabar);
  color: var(--se-warm-white);
}

.about-top__arrow {
  font-family: var(--se-mono);
  font-size: var(--se-fs-16);
  line-height: 1;
}

.about-top[data-visible="false"] {
  opacity: 0.55;
}

/* 平板及以上 */
@media (min-width: 768px) {
  .page-about {
    padding-bottom: 104px;
  }

  .about-head__num {
    font-size: var(--se-fs-40);
  }

  .about-head__title {
    font-size: var(--se-fs-28);
  }

  .about-sec {
    padding-top: 64px;
  }

  .about-band {
    margin-top: 64px;
    height: 8px;
  }

  .about-seal {
    width: 88px;
    height: 88px;
  }

  .about-file__row dt,
  .about-file__row dd {
    font-size: var(--se-fs-16);
  }

  .about-flow h3 {
    font-size: var(--se-fs-20);
  }

  .about-coop__row {
    grid-template-columns: minmax(0, 140px) minmax(0, 1fr);
    gap: 24px;
  }
}

/* 桌面端双栏与错落排布 */
@media (min-width: 900px) {
  .about-crumb {
    padding-top: 32px;
  }

  .about-hero {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
    align-items: start;
    padding-top: 40px;
  }

  .about-hero__lead {
    position: relative;
    padding-right: 60px;
  }

  .about-hero__statement {
    position: absolute;
    top: 0;
    right: 0;
    margin: 0;
    writing-mode: vertical-rl;
    font-size: var(--se-fs-14);
    letter-spacing: 0.34em;
    line-height: 1.6;
  }

  .about-team {
    display: flex;
    align-items: flex-start;
    gap: 18px;
  }

  .about-team__card--a {
    flex: 4 1 0;
  }

  .about-team__card--b {
    flex: 3 1 0;
    margin-top: 38px;
  }

  .about-team__card--c {
    flex: 5 1 0;
    margin-top: 80px;
  }

  .about-cal {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 48px;
    align-items: start;
  }

  .about-cal__figure {
    margin-top: 6px;
  }

  .about-keeps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px 36px;
  }

  .about-keeps__item:last-child {
    grid-column: 1 / -1;
    max-width: 62ch;
  }
}

@media (min-width: 1120px) {
  .about-hero {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  }

  .about-team__card {
    padding: 26px 24px 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .about-crumb a,
  .about-top {
    transition: none;
  }
}
<<<END>>>

.page-about {
  --aspect-text: currentColor;
}