.page-about {
  --about-text: rgba(244, 238, 223, .86);
  --about-pad: clamp(18px, 4.5vw, 44px);
  background: var(--ink);
  color: var(--cream);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about .about-inner {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding-inline: var(--about-pad);
}

/* ---------- 面包屑 ---------- */

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: clamp(18px, 3vw, 26px) 0 0;
  list-style: none;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--mute);
}

.page-about .breadcrumbs li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  color: var(--line-2);
}

.page-about .breadcrumbs a {
  color: var(--mute);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

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

.page-about .breadcrumbs [aria-current="page"] {
  color: var(--cream);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  border-bottom: 1px solid var(--line);
  background-color: var(--ink);
  background-image:
    radial-gradient(110% 85% at 88% -12%, var(--tint-cyan), transparent 62%),
    radial-gradient(85% 70% at -6% 112%, var(--tint-orange), transparent 60%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 52px);
  padding: clamp(26px, 5vw, 52px) 0 clamp(46px, 7vw, 88px);
}

@media (min-width: 920px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, .95fr);
    align-items: end;
    gap: clamp(40px, 6vw, 88px);
  }
}

.page-about .about-kicker {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 22px 0 0;
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--mute);
}

.page-about .about-kicker__num {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--orange);
}

.page-about .about-hero__title {
  margin: clamp(14px, 2.4vw, 22px) 0 0;
  max-width: 15em;
  font-family: var(--font-head);
  font-size: clamp(30px, 6.4vw, 58px);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -.008em;
  color: var(--cream);
}

.page-about .about-hero__lede {
  margin: clamp(18px, 3vw, 26px) 0 0;
  max-width: 46em;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.8;
  color: var(--about-text);
}

/* 首屏数字账本 */

.page-about .about-ledger {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
  box-shadow: var(--shadow-1);
}

.page-about .about-ledger__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 18px 18px;
  background: linear-gradient(180deg, rgba(44, 74, 58, .34), rgba(27, 20, 16, .92));
}

.page-about .about-ledger__label {
  font-family: var(--font-num);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--mute);
}

.page-about .about-ledger__value {
  display: flex;
  align-items: baseline;
  gap: 5px;
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(28px, 4.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-ledger__unit {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .06em;
  color: var(--mute);
}

/* ---------- 章节通用 ---------- */

.page-about .about-chapter {
  padding: clamp(52px, 8.5vw, 108px) 0;
  border-bottom: 1px solid var(--line);
  background: var(--ink);
}

.page-about .about-chapter--coal {
  background: var(--coal);
}

.page-about .about-chapter--brown {
  background: linear-gradient(180deg, var(--coal) 0%, var(--brown) 100%);
}

.page-about .about-chapter__head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(28px, 5vw, 52px);
}

.page-about .about-chapter__num {
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(52px, 9vw, 104px);
  font-weight: 700;
  line-height: .86;
  letter-spacing: -.03em;
  color: var(--moss);
  -webkit-text-stroke: 1px var(--line-2);
}

.page-about .about-chapter__title {
  margin: 0;
  max-width: 22em;
  font-family: var(--font-head);
  font-size: clamp(25px, 4.3vw, 44px);
  font-weight: 600;
  line-height: 1.14;
  letter-spacing: -.004em;
  color: var(--cream);
}

/* ---------- 分屏 ---------- */

.page-about .about-split {
  display: grid;
  gap: clamp(24px, 4vw, 46px);
  align-items: center;
}

@media (min-width: 880px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 1fr);
  }

  .page-about .about-split--flip {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.06fr);
  }

  .page-about .about-split--flip .about-prose {
    order: 2;
  }

  .page-about .about-split--flip .about-facts {
    order: 1;
  }
}

.page-about .about-prose p {
  margin: 0 0 18px;
  font-size: clamp(16px, 1.4vw, 17px);
  line-height: 1.85;
  color: var(--about-text);
}

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

/* ---------- 图框 ---------- */

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
  background: var(--brown);
  box-shadow: var(--shadow-1);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-figure--band img {
  aspect-ratio: 21 / 9;
}

.page-about .about-figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: .01em;
  color: var(--mute);
}

.page-about .about-figure--team {
  margin-top: clamp(24px, 4vw, 40px);
}

/* ---------- 团队角色 ---------- */

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

@media (min-width: 680px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-role {
  position: relative;
  padding: 24px 20px 26px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: linear-gradient(180deg, rgba(44, 74, 58, .38) 0%, rgba(27, 20, 16, .92) 100%);
  transition: transform .38s var(--ease), border-color .38s var(--ease), box-shadow .38s var(--ease);
}

.page-about .about-role::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 2px;
  border-radius: var(--r) var(--r) 0 0;
  background: linear-gradient(90deg, var(--cyan), rgba(51, 240, 208, 0) 78%);
  opacity: .28;
  transition: opacity .38s var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  transform: translateY(-4px);
  border-color: var(--line-2);
  box-shadow: var(--shadow-2);
}

.page-about .about-role:hover::before,
.page-about .about-role:focus-within::before {
  opacity: 1;
}

.page-about .about-role__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(34px, 5vw, 46px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-role__title {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--cream);
}

.page-about .about-role__desc {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mute);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  position: relative;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 4px 0 0 26px;
  list-style: none;
  border-left: 1px solid var(--line-2);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(26px, 4vw, 40px);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--coal);
  border: 1.5px solid var(--line-2);
  transition: border-color .32s var(--ease), background-color .32s var(--ease), box-shadow .32s var(--ease);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  border-color: var(--cyan);
  background: var(--cyan);
  box-shadow: 0 0 0 4px var(--tint-cyan);
}

.page-about .about-timeline__year {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--orange);
}

.page-about .about-timeline__body h3 {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(18px, 2vw, 21px);
  font-weight: 600;
  line-height: 1.32;
  color: var(--cream);
}

.page-about .about-timeline__body p {
  margin: 8px 0 0;
  max-width: 56em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-text);
}

/* ---------- 三条做法 ---------- */

.page-about .about-actions {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 820px) {
  .page-about .about-actions {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-action {
  display: flex;
  flex-direction: column;
  padding: 26px 22px 28px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--brown);
  transition: border-color .38s var(--ease), transform .38s var(--ease);
}

.page-about .about-action:hover,
.page-about .about-action:focus-within {
  border-color: var(--line-2);
  transform: translateY(-3px);
}

.page-about .about-action__idx {
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--amber);
}

.page-about .about-action__name {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--cream);
}

.page-about .about-action__metric {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 18px 0 0;
  font-family: var(--font-num);
  font-size: clamp(38px, 5.4vw, 54px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-action__metric span {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--mute);
}

.page-about .about-action__desc {
  margin: 18px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-text);
}

/* ---------- 资质与生态 ---------- */

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
}

.page-about .about-facts__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 18px;
  background: linear-gradient(180deg, rgba(17, 21, 20, .96), rgba(27, 20, 16, .96));
}

.page-about .about-facts__num {
  font-family: var(--font-num);
  font-size: clamp(28px, 4.2vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-facts__unit {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .06em;
  color: var(--mute);
}

.page-about .about-facts__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--about-text);
}

/* ---------- 侧带 ---------- */

.page-about .about-rail {
  padding: clamp(34px, 6vw, 64px) 0;
  border-bottom: 1px solid var(--line);
  background: var(--brown);
}

.page-about .about-rail__panel {
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: rgba(11, 31, 23, .55);
  overflow: hidden;
}

.page-about .about-rail__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: .05em;
  color: var(--cream);
  background: linear-gradient(90deg, var(--tint-cyan), transparent 68%);
  transition: background-color .3s var(--ease);
}

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

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

.page-about .about-rail__hint {
  position: relative;
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  border: 1px solid var(--line-2);
  border-radius: 50%;
}

.page-about .about-rail__hint::before,
.page-about .about-rail__hint::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background: var(--cyan);
  transform: translate(-50%, -50%);
}

.page-about .about-rail__hint::before {
  width: 10px;
  height: 1.5px;
}

.page-about .about-rail__hint::after {
  width: 1.5px;
  height: 10px;
  transition: opacity .3s var(--ease);
}

.page-about .about-rail__panel[open] .about-rail__hint::after {
  opacity: 0;
}

.page-about .about-rail__body {
  padding: 20px;
  border-top: 1px solid var(--line);
}

.page-about .about-rail__list {
  display: grid;
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 780px) {
  .page-about .about-rail__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 28px;
  }
}

.page-about .about-rail__row {
  padding-left: 14px;
  border-left: 1px solid var(--line-2);
}

.page-about .about-rail__row-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--cream);
}

.page-about .about-rail__row-desc {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mute);
}

.page-about .about-rail__link {
  display: inline-block;
  margin-top: 12px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(51, 240, 208, .38);
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

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

/* ---------- 收尾 CTA ---------- */

.page-about .about-cta {
  padding: clamp(44px, 7vw, 84px) 0;
  background:
    radial-gradient(90% 130% at 12% 0%, var(--tint-orange), transparent 62%),
    var(--coal);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 24px;
  align-items: center;
}

@media (min-width: 860px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .8fr);
    gap: 40px;
  }
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(23px, 3.4vw, 34px);
  font-weight: 600;
  line-height: 1.18;
  color: var(--cream);
}

.page-about .about-cta__desc {
  margin: 12px 0 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-text);
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-action,
  .page-about .about-role::before,
  .page-about .about-timeline__item::before,
  .page-about .about-rail__hint::after,
  .page-about .about-rail__link,
  .page-about .breadcrumbs a {
    transition: none;
  }

  .page-about .about-role:hover,
  .page-about .about-role:focus-within,
  .page-about .about-action:hover,
  .page-about .about-action:focus-within {
    transform: none;
  }
}
<<<END>>>