.page-about {
  background-color: var(--paper-050);
  color: var(--ink-900);
  font-family: var(--font-text);
  overflow-x: hidden;
}

.page-about .about-hero .eyebrow,
.page-about .about-timeline .eyebrow,
.page-about .about-archive .eyebrow,
.page-about .about-sample .eyebrow {
  color: var(--celadon-200);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  background-color: var(--ink-900);
  color: var(--on-dark);
  padding: 0 0 56px;
}

.page-about .about-hero__crumbs {
  padding: 20px 0 0;
}

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

.page-about .about-hero__crumbs .breadcrumbs__item {
  color: var(--on-dark-soft);
}

.page-about .about-hero__crumbs .breadcrumbs__item:not(:last-child)::after {
  content: "/";
  margin: 0 8px;
  color: var(--blue-500);
}

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

.page-about .about-hero__crumbs .breadcrumbs__item a:hover {
  border-bottom-color: var(--amber-500);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  padding-top: 40px;
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-size: clamp(38px, 8.6vw, 78px);
  line-height: 0.98;
  letter-spacing: -0.02em;
}

.page-about .about-hero__title-a {
  display: block;
  font-weight: 200;
  color: var(--on-dark);
}

.page-about .about-hero__title-b {
  display: block;
  font-weight: 700;
  color: var(--amber-500);
}

.page-about .about-hero__dek {
  margin: 26px 0 0;
  max-width: 44ch;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--on-dark-dim);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

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

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--ink-line);
  background-color: var(--ink-950);
}

.page-about .about-hero__figure figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--on-dark-soft);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  margin: 48px 0 0;
  padding: 0;
  list-style: none;
  background-color: var(--ink-line);
  border: 1px solid var(--ink-line);
}

.page-about .about-facts__item {
  background-color: var(--ink-900);
  padding: 20px 16px 22px;
}

.page-about .about-facts__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 1;
  color: var(--amber-500);
}

.page-about .about-facts__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--on-dark-dim);
}

.page-about .about-hero__rule {
  height: 10px;
  margin-top: 40px;
  border-top: 1px solid var(--ink-line);
  background-image: repeating-linear-gradient(
    to right,
    var(--ink-line) 0,
    var(--ink-line) 1px,
    transparent 1px,
    transparent 8.3333%
  );
}

/* ============ 时间轴 ============ */
.page-about .about-timeline {
  background-color: var(--ink-950);
  color: var(--on-dark);
  padding: 64px 0 76px;
}

.page-about .about-timeline__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about .about-timeline__heading {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(25px, 5vw, 34px);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--on-dark);
}

.page-about .about-rail {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  border-left: 1px solid var(--ink-line);
}

.page-about .about-rail__item {
  position: relative;
}

.page-about .about-rail__link {
  display: block;
  position: relative;
  padding: 12px 0 12px 22px;
  text-decoration: none;
  color: var(--on-dark-dim);
}

.page-about .about-rail__dot {
  position: absolute;
  left: -5px;
  top: 17px;
  width: 9px;
  height: 9px;
  background-color: var(--ink-950);
  border: 1px solid var(--celadon-600);
}

.page-about .about-rail__dot--now {
  background-color: var(--amber-500);
  border-color: var(--amber-500);
}

.page-about .about-rail__link:hover .about-rail__dot,
.page-about .about-rail__link:focus-visible .about-rail__dot {
  background-color: var(--amber-500);
  border-color: var(--amber-500);
}

.page-about .about-rail__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--celadon-200);
}

.page-about .about-rail__text {
  display: block;
  margin-top: 4px;
  font-size: 15px;
  line-height: 1.55;
}

.page-about .about-rail__link:hover .about-rail__text,
.page-about .about-rail__link:focus-visible .about-rail__text {
  color: var(--on-dark);
}

.page-about .about-timeline__cards {
  display: grid;
  gap: 18px;
}

.page-about .about-card {
  position: relative;
  background-color: var(--ink-900);
  border: 1px solid var(--ink-line);
  padding: 22px 20px 26px;
}

.page-about .about-card::before {
  content: "";
  position: absolute;
  left: -1px;
  top: -1px;
  width: 2px;
  height: 26px;
  background-color: var(--amber-500);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--dur-base) var(--ease);
}

.page-about .about-card:hover::before,
.page-about .about-card:focus-within::before {
  transform: scaleY(1);
}

.page-about .about-card__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ink-line);
}

.page-about .about-card__tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--celadon-200);
}

.page-about .about-card__ver {
  font-family: var(--font-mono);
  font-size: 19px;
  line-height: 1;
  color: var(--amber-500);
}

.page-about .about-card__title {
  margin: 16px 0 10px;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 600;
  line-height: 1.3;
  color: var(--on-dark);
}

.page-about .about-card__body {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--on-dark-dim);
}

/* ============ 五类入口 ============ */
.page-about .about-taxonomy {
  background-color: var(--paper-050);
  padding: 64px 0 68px;
}

.page-about .about-sec-head {
  max-width: 62ch;
}

.page-about .about-sec-head h2 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 5.2vw, 40px);
  font-weight: 600;
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .about-lede {
  margin: 16px 0 0;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--slate-600);
}

.page-about .about-matrix {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 40px;
  background-color: var(--line-300);
  border: 1px solid var(--line-300);
}

.page-about .about-cell {
  background-color: var(--white-000);
  padding: 24px 20px 26px;
}

.page-about .about-cell--lead {
  background-color: var(--amber-200);
}

.page-about .about-cell--blank {
  background-color: var(--paper-050);
  min-height: 48px;
}

.page-about .about-cell__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--celadon-600);
}

.page-about .about-cell--lead .about-cell__num {
  color: var(--ink-700);
}

.page-about .about-cell h3 {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 600;
  line-height: 1.25;
  color: var(--ink-900);
}

.page-about .about-cell p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--slate-600);
}

.page-about .about-cell--lead p {
  color: var(--ink-700);
}

.page-about .about-taxonomy__figure {
  margin: 32px 0 0;
}

.page-about .about-taxonomy__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line-300);
}

.page-about .about-taxonomy__figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate-600);
}

/* ============ 团队与节奏 ============ */
.page-about .about-team {
  background-color: var(--paper-050);
  padding: 0 0 72px;
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  padding-top: 44px;
  border-top: 1px solid var(--line-300);
}

.page-about .about-team__intro h2 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(25px, 5vw, 34px);
  font-weight: 600;
  line-height: 1.2;
  color: var(--ink-900);
}

.page-about .about-team__text {
  margin: 16px 0 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--slate-600);
}

.page-about .about-team__groups {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background-color: var(--line-300);
  border: 1px solid var(--line-300);
}

.page-about .about-team__group {
  background-color: var(--white-000);
  padding: 20px 18px 22px;
}

.page-about .about-team__tag {
  display: inline-block;
  margin: 0;
  padding-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--ink-900);
  border-bottom: 1px solid var(--amber-500);
}

.page-about .about-team__group p {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--slate-600);
}

.page-about .about-team__sub {
  margin: 36px 0 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink-900);
}

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

.page-about .about-rhythm__item {
  display: grid;
  grid-template-columns: 74px 1fr;
  gap: 16px;
  align-items: start;
  padding: 14px 0;
  border-top: 1px solid var(--line-300);
}

.page-about .about-rhythm__key {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--celadon-600);
}

.page-about .about-rhythm__val {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink-900);
}

/* ============ 更新记录 ============ */
.page-about .about-archive {
  background-color: var(--ink-900);
  color: var(--on-dark);
  padding: 64px 0 0;
}

.page-about .about-sec-head--dark h2 {
  color: var(--on-dark);
}

.page-about .about-archive__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 36px;
}

.page-about .about-archive__text p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--on-dark-dim);
}

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

.page-about .about-archive__steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background-color: var(--ink-line);
  border: 1px solid var(--ink-line);
}

.page-about .about-archive__step {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 14px;
  align-items: baseline;
  background-color: var(--ink-950);
  padding: 18px 16px;
}

.page-about .about-archive__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--amber-500);
}

.page-about .about-archive__step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--on-dark-dim);
}

.page-about .about-archive__figure {
  margin: 48px 0 0;
}

.page-about .about-archive__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--ink-line);
}

.page-about .about-archive__figure figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--on-dark-soft);
}

/* ============ 对照样本 ============ */
.page-about .about-sample {
  background-color: var(--ink-700);
  color: var(--on-dark);
  padding: 52px 0 60px;
}

.page-about .about-sample__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .about-sample__head h2 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 4.8vw, 33px);
  font-weight: 600;
  line-height: 1.2;
  color: var(--on-dark);
}

.page-about .about-sample__text {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--on-dark-dim);
}

.page-about .about-dims {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background-color: var(--blue-500);
}

.page-about .about-dims__item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  background-color: var(--ink-700);
  padding: 15px 16px;
  font-size: 15px;
  line-height: 1.5;
  color: var(--on-dark);
}

.page-about .about-dims__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--amber-500);
}

.page-about .about-dims__item--note {
  display: block;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--on-dark-dim);
}

/* ============ 继续前进 ============ */
.page-about .about-next {
  background-color: var(--paper-050);
  padding: 80px 0 96px;
}

.page-about .about-next__head h2 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 5.2vw, 40px);
  font-weight: 600;
  line-height: 1.16;
  color: var(--ink-900);
}

.page-about .about-next__paths {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 44px;
}

.page-about .about-next__path {
  display: block;
  padding-top: 22px;
  text-decoration: none;
  color: var(--ink-900);
  border-top: 2px solid var(--ink-900);
  transition: border-color var(--dur-base) var(--ease);
}

.page-about .about-next__path:hover,
.page-about .about-next__path:focus-visible {
  border-top-color: var(--amber-500);
}

.page-about .about-next__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--celadon-600);
}

.page-about .about-next__path h3 {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-size: 25px;
  font-weight: 600;
  line-height: 1.25;
}

.page-about .about-next__path p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--slate-600);
}

.page-about .about-next__go {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ink-900);
  border-bottom: 1px solid var(--amber-500);
  padding-bottom: 3px;
}

.page-about .about-next__aside {
  margin: 52px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--slate-600);
}

.page-about .about-next__aside a {
  color: var(--ink-900);
  text-decoration: none;
  border-bottom: 1px solid var(--amber-500);
  padding-bottom: 2px;
}

.page-about .about-next__aside a:hover {
  border-bottom-color: var(--celadon-600);
}

/* ============ 响应式 ============ */
@media (min-width: 560px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, 1fr);
  }

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

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

  .page-about .about-dims__item--note {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-bottom: 72px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    gap: 56px;
    padding-top: 56px;
    align-items: start;
  }

  .page-about .about-hero__figure img {
    max-height: 640px;
    object-fit: cover;
    object-position: top center;
  }

  .page-about .about-hero__rule {
    margin-top: 64px;
  }

  .page-about .about-timeline {
    padding: 96px 0 112px;
  }

  .page-about .about-taxonomy {
    padding: 96px 0 104px;
  }

  .page-about .about-team {
    padding-bottom: 96px;
  }

  .page-about .about-archive {
    padding-top: 96px;
  }

  .page-about .about-sample {
    padding: 60px 0 68px;
  }

  .page-about .about-next {
    padding: 112px 0 132px;
  }
}

@media (min-width: 980px) {
  .page-about .about-timeline__grid {
    grid-template-columns: 5fr 7fr;
    gap: 64px;
  }

  .page-about .about-timeline__rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-timeline__cards {
    gap: 24px;
  }

  .page-about .about-card:nth-child(2) {
    margin-left: 28px;
  }

  .page-about .about-card:nth-child(3) {
    margin-left: 56px;
  }

  .page-about .about-card:nth-child(4) {
    margin-left: 84px;
  }

  .page-about .about-archive__grid {
    grid-template-columns: 6fr 6fr;
    gap: 56px;
    align-items: start;
  }

  .page-about .about-sample__grid {
    grid-template-columns: 5fr 7fr;
    gap: 56px;
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .about-team__grid {
    grid-template-columns: 4fr 8fr;
    gap: 56px;
  }

  .page-about .about-team__intro {
    align-self: start;
    position: sticky;
    top: 96px;
  }

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

  .page-about .about-next__paths {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-next__path:last-child {
    margin-top: 56px;
  }
}

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