.page-about {
  --about-gap: 28px;
  --about-rail: 152px;
  padding-bottom: 72px;
  color: var(--warm);
}

/* ---------- 面包屑与首屏 ---------- */
.page-about .breadcrumb {
  padding: 20px 0 4px;
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  padding: 24px 0 52px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: 0;
  top: -18%;
  right: -14%;
  width: 78%;
  height: 136%;
  background: linear-gradient(158deg, rgba(15, 42, 34, 0.96) 0%, rgba(20, 56, 45, 0.32) 52%, rgba(10, 15, 13, 0) 78%);
  clip-path: polygon(34% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: 0;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, rgba(198, 255, 61, 0.55), rgba(47, 212, 198, 0.18) 42%, rgba(126, 140, 133, 0) 100%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-hero__figure {
  margin: 0;
  border: 1px solid var(--line-strong);
  background: var(--card);
  padding: 10px;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 9 / 7;
  background: var(--deep);
}

.page-about .about-hero__figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--sage);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__body h1 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-28);
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--warm);
}

.page-about .about-hero__body .lede {
  margin: 0;
  max-width: 62ch;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--warm);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-hero__stat {
  background: rgba(20, 56, 45, 0.62);
  padding: 14px 16px;
}

.page-about .about-hero__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-28);
  font-weight: 700;
  line-height: 1.1;
  color: var(--lime);
}

.page-about .about-hero__cap {
  display: block;
  margin-top: 6px;
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--sage);
}

/* ---------- 通用区块 ---------- */
.page-about .about-block {
  padding: 48px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-block:first-of-type {
  border-top: 0;
}

.page-about .about-block .section__head {
  margin-bottom: 28px;
}

.page-about .section__head--flush {
  margin-bottom: 24px;
}

.page-about .about-cols {
  display: grid;
  gap: 24px;
}

.page-about .about-cols__main p {
  margin: 0 0 14px;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--warm);
}

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

.page-about .about-note {
  border: 1px solid var(--line);
  border-left: 3px solid var(--lime);
  background: rgba(20, 56, 45, 0.5);
  padding: 20px 20px 18px;
}

.page-about .about-note__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--lime);
}

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

.page-about .about-note__list li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 10px;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--warm);
}

.page-about .about-note__list li:last-child {
  margin-bottom: 0;
}

.page-about .about-note__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  background: var(--cyan);
}

/* ---------- 年份索引与时间线 ---------- */
.page-about .about-section__inner {
  display: grid;
  gap: 28px;
}

.page-about .about-rail {
  border: 1px solid var(--line);
  background: rgba(15, 42, 34, 0.55);
  padding: 16px;
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--sage);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0 0 12px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  color: var(--warm);
  text-decoration: none;
  transition: border-color 200ms var(--ease), color 200ms var(--ease), background-color 200ms var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  border-color: var(--line-lime);
  background: rgba(198, 255, 61, 0.08);
  color: var(--lime);
  outline: none;
}

.page-about .about-rail__hint {
  margin: 0;
  font-size: var(--fs-12);
  color: var(--sage);
}

.page-about .about-timeline__figure {
  margin: 0 0 28px;
  border: 1px solid var(--line);
  background: var(--deep);
  padding: 10px;
}

.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 12 / 7;
}

.page-about .about-timeline__figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--sage);
}

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

.page-about .about-node {
  position: relative;
  padding: 0 0 28px 26px;
  border-left: 1px solid var(--line);
}

.page-about .about-node:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(198, 255, 61, 0.14);
}

.page-about .about-node__year {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-20);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--lime);
}

.page-about .about-node__card {
  border: 1px solid var(--line);
  background: rgba(20, 56, 45, 0.42);
  padding: 18px 18px 16px;
}

.page-about .about-node__tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-node__title {
  margin: 0 0 10px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: var(--fs-18);
  line-height: 1.5;
  color: var(--warm);
}

.page-about .about-node__card p:last-child {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.78;
  color: var(--sage);
}

/* ---------- 团队与数据合作 ---------- */
.page-about .about-team {
  display: grid;
  gap: 28px;
}

.page-about .about-team__lead > p {
  margin: 0 0 22px;
  font-size: var(--fs-16);
  line-height: 1.78;
  color: var(--warm);
}

.page-about .about-team__figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--card);
  padding: 10px;
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 10 / 7;
}

.page-about .about-team__figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--sage);
}

.page-about .about-roles {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-role {
  background: var(--carbon);
  padding: 18px 18px 20px;
  transition: background-color 220ms var(--ease);
}

.page-about .about-role:hover {
  background: rgba(20, 56, 45, 0.68);
}

.page-about .about-role--accent {
  background: rgba(122, 74, 0, 0.22);
  border-left: 3px solid var(--amber);
}

.page-about .about-role__num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-28);
  font-weight: 700;
  line-height: 1;
  color: var(--mint);
}

.page-about .about-role--accent .about-role__num {
  color: var(--amber);
}

.page-about .about-role__name {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: var(--fs-16);
  color: var(--warm);
}

.page-about .about-role__desc {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.72;
  color: var(--sage);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-block--rhythm {
  background: linear-gradient(180deg, rgba(15, 42, 34, 0.72) 0%, rgba(10, 15, 13, 0) 100%);
}

.page-about .about-rhythm {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-rhythm__clock {
  background: rgba(10, 15, 13, 0.72);
  padding: 22px 20px;
}

.page-about .about-rhythm__big {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-44);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-rhythm__big span {
  margin-left: 8px;
  font-size: var(--fs-14);
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--sage);
}

.page-about .about-rhythm__cap {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--warm);
}

.page-about .about-rhythm__note {
  background: rgba(20, 56, 45, 0.55);
  padding: 22px 20px;
}

.page-about .about-rhythm__note .tag {
  display: inline-block;
  margin: 0 0 12px;
}

.page-about .about-rhythm__note p {
  margin: 0 0 12px;
  font-size: var(--fs-14);
  line-height: 1.78;
  color: var(--warm);
}

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

.page-about .about-inline-link {
  font-size: var(--fs-14);
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 212, 198, 0.4);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--line-lime);
}

/* ---------- 版本记录 ---------- */
.page-about .about-versions__lead {
  margin: 0 0 24px;
  max-width: 74ch;
  font-size: var(--fs-16);
  line-height: 1.78;
  color: var(--warm);
}

.page-about .about-versions {
  border: 1px solid var(--line);
  background: rgba(15, 42, 34, 0.42);
}

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

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

.page-about .about-version__summary {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 56px;
  padding: 12px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-version__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--fs-18);
  color: var(--sage);
}

.page-about .about-version[open] .about-version__summary::after {
  content: "−";
  color: var(--lime);
}

.page-about .about-version__summary:hover {
  background: rgba(198, 255, 61, 0.06);
}

.page-about .about-version__summary:focus-visible {
  outline: 2px solid var(--line-lime);
  outline-offset: -2px;
}

.page-about .about-version__no {
  font-family: var(--font-mono);
  font-size: var(--fs-18);
  font-weight: 700;
  color: var(--lime);
  min-width: 68px;
}

.page-about .about-version__label {
  font-size: var(--fs-16);
  color: var(--warm);
}

.page-about .about-version__panel {
  padding: 0 18px 18px;
}

.page-about .about-version__panel p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.78;
  color: var(--sage);
}

/* ---------- 结尾引导 ---------- */
.page-about .about-cta {
  border-top: 1px solid var(--line);
  background: linear-gradient(118deg, rgba(15, 42, 34, 0.9) 0%, rgba(10, 15, 13, 0.4) 68%);
  padding: 44px 0 8px;
}

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

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-28);
  line-height: 1.35;
  color: var(--warm);
}

.page-about .about-cta__text p {
  margin: 0;
  max-width: 56ch;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--sage);
}

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

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .about-hero {
    padding: 32px 0 60px;
  }

  .page-about .about-hero__body h1 {
    font-size: var(--fs-44);
  }

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

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

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

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

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

@media (min-width: 900px) {
  .page-about {
    --about-gap: 44px;
  }

  .page-about .about-block {
    padding: 64px 0;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-hero__figure {
    margin-top: 36px;
    transform: translateY(-8px);
  }

  .page-about .about-cols {
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 40px;
  }

  .page-about .about-section__inner {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 48px;
  }

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

  .page-about .about-rail__list {
    flex-direction: column;
  }

  .page-about .about-rail__list a {
    width: 100%;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-roles {
    grid-template-columns: 1fr;
  }

  .page-about .about-nodes {
    padding-left: 4px;
  }

  .page-about .about-node {
    padding-left: 34px;
  }

  .page-about .about-node__year {
    font-size: var(--fs-28);
  }
}

@media (min-width: 1080px) {
  .page-about .about-node {
    display: grid;
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 24px;
    padding-left: 34px;
    padding-bottom: 32px;
  }

  .page-about .about-node__year {
    margin: 0;
    text-align: right;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  .page-about .about-hero__figure {
    transform: none;
  }
}
<<<END>>>