.page-about {
  --about-rule: rgba(27, 23, 21, 0.16);
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-body);
  padding-bottom: 40px;
}

.page-about .about-crumbs {
  background: var(--cream);
  padding-top: 18px;
}

.page-about .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .breadcrumbs__item {
  color: var(--ink-soft);
}

.page-about .breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--gold-bronze);
}

.page-about .breadcrumbs__item a {
  color: var(--red);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .breadcrumbs__item a:hover,
.page-about .breadcrumbs__item a:focus-visible {
  border-bottom-color: var(--red);
}

/* 首屏 */
.page-about .about-mast {
  position: relative;
  padding: clamp(28px, 5vw, 64px) 0 clamp(30px, 4vw, 54px);
  background:
    repeating-linear-gradient(135deg, rgba(198, 161, 91, 0.12) 0 2px, transparent 2px 16px),
    var(--cream);
  border-bottom: 3px solid var(--ink);
}

.page-about .about-mast__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 46px);
  align-items: end;
}

.page-about .about-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--red);
}

.page-about .about-eyebrow::before {
  content: "";
  width: 34px;
  height: 3px;
  background: var(--gold);
}

.page-about .about-mast__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(31px, 6vw, 62px);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.page-about .about-mast__mark {
  display: inline-block;
  background: linear-gradient(transparent 62%, rgba(198, 161, 91, 0.55) 62%);
  padding-bottom: 2px;
}

.page-about .about-mast__lede {
  max-width: 44em;
  margin: 20px 0 0;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-mast__lede--tight {
  margin-top: 12px;
  font-size: 14px;
  color: var(--gray, var(--ink-soft));
  color: var(--ink-soft);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
  margin: 0;
  padding: 20px 22px;
  background: var(--paper);
  border: 3px solid var(--ink);
  box-shadow: var(--shadow-hard);
}

.page-about .about-facts__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--gold-bronze);
}

.page-about .about-facts__v {
  margin: 4px 0 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 700;
  line-height: 1.15;
  color: var(--ink);
}

/* 章节带 */
.page-about .about-band {
  padding: clamp(40px, 6vw, 84px) 0;
}

.page-about .about-band--cream {
  background: var(--cream);
}

.page-about .about-band--paper {
  background: var(--paper);
  border-top: 3px solid var(--ink);
  border-bottom: 3px solid var(--ink);
}

.page-about .about-band--red {
  background: var(--red-deep);
  color: var(--cream);
  border-top: 3px solid var(--ink);
  border-bottom: 3px solid var(--ink);
}

.page-about .about-band--last {
  padding-bottom: clamp(64px, 9vw, 110px);
}

.page-about .about-head {
  display: grid;
  gap: 10px;
  padding-bottom: 16px;
  margin-bottom: clamp(24px, 3.6vw, 40px);
  border-bottom: 3px solid var(--gold);
}

.page-about .about-head__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--red);
}

.page-about .about-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-about .about-head__lede {
  max-width: 62em;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-head--onred .about-head__num {
  color: var(--gold-champagne);
}

.page-about .about-head--onred {
  border-bottom-color: var(--gold-champagne);
}

.page-about .about-head--onred .about-head__lede {
  color: rgba(244, 235, 221, 0.82);
}

/* 图片 */
.page-about .about-figure {
  margin: clamp(22px, 3.4vw, 36px) 0 0;
}

.page-about .about-figure--wide {
  margin-top: 0;
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-figure--square {
  max-width: 760px;
}

.page-about .about-figure__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 3px solid var(--ink);
  box-shadow: var(--shadow-gold);
  object-fit: cover;
  background: var(--cream);
}

.page-about .about-figure__cap {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .about-band--red .about-figure__cap {
  color: rgba(244, 235, 221, 0.78);
}

/* 分段切换 */
.page-about .about-tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}

.page-about .about-tabs__tab {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  padding: 9px 14px;
  color: var(--ink);
  background: var(--paper);
  border: 2px solid var(--ink);
  box-shadow: 3px 3px 0 var(--ink);
  cursor: pointer;
  transition: background 180ms ease, color 180ms ease;
}

.page-about .about-tabs__tab:hover {
  background: var(--cream);
}

.page-about .about-tabs__tab[aria-selected="true"] {
  background: var(--red);
  color: var(--cream);
  box-shadow: 3px 3px 0 var(--gold-bronze);
}

.page-about .about-tabs__tab:focus-visible {
  outline: 3px solid var(--terracotta);
  outline-offset: 2px;
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 8px;
  bottom: 10px;
  width: 3px;
  background: linear-gradient(var(--gold), var(--gold-bronze));
}

.page-about .about-stop {
  position: relative;
  padding-left: 40px;
  padding-bottom: 28px;
}

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

.page-about .about-stop::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 22px;
  height: 22px;
  background: var(--paper);
  border: 3px solid var(--red);
  transform: rotate(45deg);
}

.page-about .about-stop--next::before {
  background: var(--terracotta);
  border-color: var(--ink);
}

.page-about .about-stop__year {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(21px, 3vw, 28px);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--red);
}

.page-about .about-stop__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: clamp(17px, 1.9vw, 21px);
  font-weight: 700;
  line-height: 1.35;
}

.page-about .about-stop__text {
  margin: 0;
  max-width: 56em;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* 团队三层色带 */
.page-about .about-crew {
  border: 3px solid var(--ink);
  box-shadow: var(--shadow-hard);
}

.page-about .about-crew__band {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: clamp(20px, 3vw, 32px);
  border-bottom: 3px solid var(--ink);
}

.page-about .about-crew__band:last-child {
  border-bottom: 0;
}

.page-about .about-crew__band--one {
  background: var(--red);
  color: var(--cream);
}

.page-about .about-crew__band--two {
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-crew__band--three {
  background: var(--cream);
  color: var(--ink);
  border-left: 10px solid var(--gold);
}

.page-about .about-crew__num {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .about-crew__band--two .about-crew__num,
.page-about .about-crew__band--three .about-crew__num {
  color: var(--gold-bronze);
}

.page-about .about-crew__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.2vw, 24px);
  font-weight: 800;
  line-height: 1.25;
}

.page-about .about-crew__text {
  margin: 0;
  max-width: 52em;
  font-size: 14.5px;
  line-height: 1.85;
}

.page-about .about-crew__band--one .about-crew__text {
  color: rgba(244, 235, 221, 0.88);
}

.page-about .about-crew__band--two .about-crew__text,
.page-about .about-crew__band--three .about-crew__text {
  color: var(--ink-soft);
}

.page-about .about-crew__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

/* 批次折叠 */
.page-about .about-batches {
  display: grid;
  gap: 14px;
}

.page-about .about-batch {
  background: var(--paper);
  color: var(--ink);
  border: 3px solid var(--ink);
  box-shadow: 5px 5px 0 var(--gold-bronze);
}

.page-about .about-batch__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 14px;
}

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

.page-about .about-batch__summary:focus-visible {
  outline: 3px solid var(--terracotta);
  outline-offset: -3px;
}

.page-about .about-batch__code {
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.08em;
  color: var(--red);
}

.page-about .about-batch__state {
  font-size: 11px;
  letter-spacing: 0.14em;
  padding: 3px 9px;
  border: 2px solid var(--ink);
  background: var(--cream);
  color: var(--ink);
}

.page-about .about-batch__summary::after {
  content: "＋";
  margin-left: auto;
  font-size: 17px;
  color: var(--red);
}

.page-about .about-batch[open] .about-batch__summary::after {
  content: "－";
}

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

.page-about .about-batch__body p {
  margin: 14px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-batch__note {
  padding-left: 12px;
  border-left: 3px solid var(--gold);
  font-size: 13.5px !important;
  color: var(--gold-dark) !important;
}

.page-about .about-subtitle {
  margin: clamp(30px, 4vw, 48px) 0 14px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.1vw, 23px);
  font-weight: 700;
  color: var(--gold-champagne);
}

/* 维护节奏 */
.page-about .about-cadence {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-light);
}

.page-about .about-cadence__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-cadence__cycle {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gold-champagne);
}

.page-about .about-cadence__act {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .about-cadence__why {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(244, 235, 221, 0.8);
}

/* 合作生态 */
.page-about .about-eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 36px);
  align-items: center;
}

.page-about .about-eco__svg {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  background: var(--paper);
  border: 3px solid var(--ink);
  box-shadow: 6px 6px 0 var(--gold-bronze);
}

.page-about .about-eco__wire {
  stroke: var(--gold-bronze);
  stroke-width: 2;
}

.page-about .about-eco__dot {
  fill: var(--terracotta);
  stroke: var(--ink);
  stroke-width: 2;
}

.page-about .about-eco__node {
  fill: var(--cream);
  stroke: var(--ink);
  stroke-width: 2.5;
}

.page-about .about-eco__node--core {
  fill: var(--red);
}

.page-about .about-eco__label {
  font-family: var(--font-body);
  font-size: 15px;
  fill: var(--ink);
}

.page-about .about-eco__label--core {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  fill: var(--cream);
}

.page-about .about-eco__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.1vw, 22px);
  font-weight: 700;
}

.page-about .about-eco__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-eco__list li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-eco__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 9px;
  height: 9px;
  background: var(--gold);
  border: 2px solid var(--ink);
}

.page-about .about-eco__foot {
  margin: 16px 0 0;
  padding: 12px 14px;
  font-size: 14px;
  line-height: 1.8;
  background: var(--cream);
  border-left: 6px solid var(--red);
  color: var(--ink-soft);
}

/* 服务数据 */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border: 3px solid var(--ink);
  background: var(--paper);
  box-shadow: var(--shadow-hard);
}

.page-about .about-stats__item {
  display: grid;
  gap: 6px;
  padding: 18px;
  border-bottom: 1px solid var(--about-rule);
  border-right: 1px solid var(--about-rule);
}

.page-about .about-stats__item:nth-child(2n) {
  border-right: 0;
}

.page-about .about-stats__item:nth-last-child(-n + 2) {
  border-bottom: 0;
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.6vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--red);
}

.page-about .about-stats__unit {
  font-size: 0.45em;
  font-weight: 500;
  margin-left: 2px;
  color: var(--gold-bronze);
}

.page-about .about-stats__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-soft);
}

.page-about .about-notes {
  margin-top: clamp(20px, 3vw, 32px);
  padding-left: 18px;
  border-left: 6px solid var(--gold);
}

.page-about .about-notes p {
  margin: 0 0 12px;
  max-width: 62em;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

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

/* 继续查找 */
.page-about .about-next {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-next__card {
  display: grid;
  gap: 6px;
  padding: 20px;
  text-decoration: none;
  color: var(--ink);
  background: var(--paper);
  border: 3px solid var(--ink);
  box-shadow: 5px 5px 0 var(--gold-bronze);
  transition: box-shadow 200ms ease, border-color 200ms ease;
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  border-color: var(--ink);
  box-shadow: 5px 5px 0 var(--red);
}

.page-about .about-next__card:focus-visible {
  outline: 3px solid var(--terracotta);
  outline-offset: 3px;
}

.page-about .about-next__kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--gold-bronze);
}

.page-about .about-next__title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  line-height: 1.3;
}

.page-about .about-next__text {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .about-service {
  display: grid;
  gap: 14px;
  margin-top: clamp(26px, 4vw, 40px);
  padding: 20px 22px;
  background: var(--red-deep);
  color: var(--cream);
  border: 3px solid var(--ink);
  box-shadow: var(--shadow-hard);
}

.page-about .about-service__text {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(16px, 1.9vw, 20px);
  font-weight: 700;
  line-height: 1.5;
}

.page-about .about-service__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* 固定返回 */
.page-about .about-return {
  position: fixed;
  right: 14px;
  bottom: 14px;
  z-index: 30;
  display: inline-flex;
  align-items: center;
  padding: 10px 15px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-decoration: none;
  color: var(--cream);
  background: var(--red);
  border: 3px solid var(--ink);
  box-shadow: 4px 4px 0 var(--ink);
}

.page-about .about-return:hover,
.page-about .about-return:focus-visible {
  background: var(--red-deep);
}

.page-about .about-return:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 3px;
}

@media (min-width: 760px) {
  .page-about .about-stop {
    display: grid;
    grid-template-columns: 108px minmax(0, 1fr);
    column-gap: 20px;
    padding-left: 44px;
  }

  .page-about .about-stop__year {
    margin-bottom: 0;
    padding-top: 2px;
  }

  .page-about .about-crew__band {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
  }

  .page-about .about-crew__num {
    font-size: 46px;
  }

  .page-about .about-cadence__row {
    grid-template-columns: 132px minmax(0, 0.9fr) minmax(0, 1.3fr);
    gap: 20px;
    align-items: baseline;
  }

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

  .page-about .about-service {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .about-return {
    right: 24px;
    bottom: 24px;
  }
}

@media (min-width: 900px) {
  .page-about .about-mast__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }

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

  .page-about .about-stats__item,
  .page-about .about-stats__item:nth-child(2n) {
    border-right: 1px solid var(--about-rule);
    border-bottom: 0;
  }

  .page-about .about-stats__item:last-child {
    border-right: 0;
  }

  .page-about .about-eco {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }

  .page-about .about-notes {
    columns: 2;
    column-gap: 34px;
  }

  .page-about .about-notes p {
    break-inside: avoid;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tabs__tab,
  .page-about .about-next__card {
    transition: none;
  }
}
<<<END>>>

.page-about {
  --gray: currentColor;
}