.page-about {
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-body);
}

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

.page-about .breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  margin-bottom: clamp(22px, 4vw, 38px);
}

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

.page-about .breadcrumb__list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-strong);
}

.page-about .breadcrumb__list li[aria-current] span,
.page-about .breadcrumb__list [aria-current="page"] {
  color: var(--green);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: calc(var(--header-h) + clamp(28px, 5vw, 56px)) 0 clamp(44px, 7vw, 84px);
  background: linear-gradient(158deg, var(--ink-deep) 0%, var(--ink-soft) 52%, var(--stand-green) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .2;
  filter: grayscale(.25) contrast(1.06);
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(7, 11, 18, .94) 8%, rgba(7, 11, 18, .62) 58%, rgba(7, 11, 18, .88) 100%),
    linear-gradient(0deg, var(--ink) 2%, rgba(7, 11, 18, 0) 62%);
}

.page-about .about-hero__eyebrow {
  color: var(--orange);
  margin-bottom: 14px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 8vw, 76px);
  line-height: 1;
  letter-spacing: -.01em;
  margin: 0 0 clamp(18px, 3vw, 28px);
  max-width: 18em;
}

.page-about .about-hero__lead {
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.85;
  color: rgba(242, 246, 244, .82);
  max-width: 60ch;
  margin: 0;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  max-width: 780px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-hero__fact {
  background: rgba(7, 11, 18, .74);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-hero__fact .data {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 28px);
  color: var(--green);
  line-height: 1.1;
}

.page-about .about-hero__fact-label {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: .02em;
}

/* 长卷骨架 */
.page-about .about-shell {
  padding-top: clamp(30px, 5vw, 64px);
  padding-bottom: clamp(48px, 8vw, 104px);
}

.page-about .about-index {
  border-bottom: 1px solid var(--line);
  padding-bottom: 14px;
  margin-bottom: clamp(26px, 4vw, 40px);
}

.page-about .about-index__title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 10px;
}

.page-about .about-index__list {
  display: flex;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0 0 2px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  white-space: nowrap;
  padding: 7px 11px;
  border: 1px solid var(--line);
  color: var(--muted);
  text-decoration: none;
  font-size: 13px;
  transition: color .25s ease, border-color .25s ease, background-color .25s ease;
}

.page-about .about-index__link .data {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--line-strong);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--white);
  border-color: var(--line-green);
  background: var(--green-dim);
}

.page-about .about-index__top {
  display: none;
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid var(--orange-dim);
  padding-bottom: 3px;
  align-self: flex-start;
}

/* 章节 */
.page-about .about-chapter {
  padding: clamp(30px, 5vw, 54px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-body > .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: clamp(16px, 2.4vw, 24px);
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(38px, 7vw, 68px);
  line-height: .82;
  color: var(--line-strong);
  flex: none;
  letter-spacing: -.03em;
}

.page-about .about-chapter__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 3.4vw, 36px);
  line-height: 1.2;
  margin: 0;
  color: var(--white);
}

.page-about .about-chapter__lead {
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: rgba(242, 246, 244, .84);
  margin: 0 0 16px;
  max-width: 62ch;
}

.page-about .about-chapter__text {
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
  margin: 0 0 22px;
  max-width: 64ch;
}

/* 三点说明 */
.page-about .about-points {
  display: grid;
  gap: 1px;
  grid-template-columns: minmax(0, 1fr);
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-points__item {
  background: var(--ink-soft);
  padding: 18px 18px 20px;
}

.page-about .about-points__title {
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--green);
  letter-spacing: .01em;
}

.page-about .about-points__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* 时间轴 */
.page-about .about-timeline {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 14px;
  width: 1px;
  background: var(--line-strong);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 30px;
  padding-bottom: 10px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 16px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px var(--green-dim);
}

.page-about .about-timeline__box {
  border-bottom: 1px solid var(--line);
}

.page-about .about-timeline__sum {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 12px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--orange);
  letter-spacing: .04em;
}

.page-about .about-timeline__name {
  font-size: clamp(15px, 1.8vw, 18px);
  font-weight: 700;
  color: var(--white);
}

.page-about .about-timeline__sum .tag {
  margin-left: auto;
}

.page-about .about-timeline__body {
  padding: 0 0 16px;
}

.page-about .about-timeline__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 62ch;
}

/* 色带章节 */
.page-about .about-chapter--band {
  background: linear-gradient(150deg, var(--stand-green) 0%, rgba(14, 42, 38, .55) 58%, var(--ink-soft) 100%);
  border: 1px solid var(--line);
  border-top: 1px solid var(--line-green);
  padding-inline: clamp(16px, 3.4vw, 32px);
  margin: clamp(26px, 4vw, 44px) 0;
}

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  align-items: start;
}

.page-about .about-split__media {
  margin: 0;
}

.page-about .about-roles {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-roles__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 12px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--line);
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-roles__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--green);
  grid-row: span 2;
  padding-top: 3px;
}

.page-about .about-roles__item strong {
  color: var(--white);
  font-size: 15px;
  grid-column: 2;
}

.page-about .about-roles__item span:last-child {
  grid-column: 2;
}

.page-about .about-note {
  margin-top: 22px;
  font-size: 14px;
  line-height: 1.8;
}

/* 数据仪表盘 */
.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  list-style: none;
  margin: 22px 0 30px;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-metrics__item {
  background: var(--surface);
  padding: 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-metrics__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1;
  color: var(--white);
  font-variant-numeric: tabular-nums;
}

.page-about .about-metrics__label {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.5;
}

.page-about .about-rhythm {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--line);
}

.page-about .about-rhythm__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 12px 0 12px 16px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-rhythm__time {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--green);
  letter-spacing: .02em;
}

.page-about .about-rhythm__text {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* 合作列表 */
.page-about .about-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
}

.page-about .about-list li {
  position: relative;
  padding: 11px 0 11px 18px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 19px;
  width: 7px;
  height: 7px;
  background: var(--orange);
}

/* 收束 CTA */
.page-about .about-cta {
  background: linear-gradient(140deg, var(--wine) 0%, var(--indigo) 62%, var(--ink-soft) 100%);
  border: 1px solid var(--line-strong);
  padding: clamp(24px, 4vw, 40px);
  margin-top: clamp(30px, 5vw, 52px);
}

.page-about .about-cta .eyebrow {
  color: var(--orange-soft);
}

.page-about .about-cta .about-chapter__title {
  margin-bottom: 14px;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 22px 0 26px;
}

.page-about .about-cta__contact {
  padding-top: 18px;
  border-top: 1px solid rgba(242, 246, 244, .18);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .about-cta__contact p {
  margin: 0 0 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: baseline;
}

.page-about .about-cta__label {
  color: var(--orange-soft);
  font-size: 12px;
  letter-spacing: .08em;
  font-family: var(--font-mono);
  min-width: 68px;
}

.page-about .about-cta__contact .data {
  font-family: var(--font-mono);
  color: var(--white);
  word-break: break-all;
}

.page-about .about-cta__hint {
  color: rgba(242, 246, 244, .68);
  font-size: 12.5px;
  margin-top: 10px;
}

@media (min-width: 620px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .about-rhythm__row {
    grid-template-columns: 150px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }

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

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

  .page-about .about-split--reverse .about-split__text {
    order: 2;
  }

  .page-about .about-split--reverse .about-split__media {
    order: 1;
  }

  .page-about .about-index__top {
    display: inline-block;
  }
}

@media (min-width: 1000px) {
  .page-about .about-shell {
    display: grid;
    grid-template-columns: 216px minmax(0, 1fr);
    column-gap: clamp(30px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 26px);
    align-self: start;
    display: flex;
    flex-direction: column;
    border-bottom: 0;
    border-left: 1px solid var(--line);
    padding: 0 0 0 16px;
    margin-bottom: 0;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-about .about-index__link {
    border-color: transparent;
    border-left: 1px solid transparent;
    margin-left: -17px;
    padding: 8px 0 8px 16px;
    white-space: normal;
    background: none;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    border-color: transparent;
    border-left-color: var(--orange);
    background: none;
    color: var(--green);
  }

  .page-about .about-chapter__num {
    font-size: clamp(52px, 5vw, 72px);
  }
}

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