.page-about {
  --about-rail-w: 216px;
  --about-year-w: 4.4rem;
  background: var(--score);
  color: var(--ink-text);
  font-family: var(--font-body);
}

@media (max-width: 599px) {
  .page-about {
    --about-year-w: 3.4rem;
  }
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4vw, 44px) 0 clamp(48px, 7vw, 92px);
  color: var(--score);
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(47, 175, 154, 0.24), transparent 58%),
    radial-gradient(70% 95% at 0% 100%, rgba(30, 122, 79, 0.38), transparent 62%),
    linear-gradient(166deg, var(--ink-3) 0%, var(--ink) 48%, var(--ink-2) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(199, 208, 203, 0.09) 0 1px,
    transparent 1px 88px
  );
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 92%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 92%);
  pointer-events: none;
}

.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__crumb {
  margin: 0 0 clamp(26px, 4vw, 48px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--fog);
}

.page-about .about-hero__crumb a {
  color: var(--fog);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms ease, border-color 180ms ease;
}

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

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 56px);
}

.page-about .about-hero__copy {
  min-width: 0;
}

.page-about .about-hero__copy .eyebrow {
  color: var(--teal);
  letter-spacing: 0.2em;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(2.15rem, 5.6vw, 3.9rem);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: 0.005em;
  color: var(--score);
}

.page-about .about-hero__lede {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 36rem;
  font-size: clamp(0.975rem, 1.1vw, 1.0625rem);
  line-height: 1.9;
  color: rgba(247, 249, 246, 0.82);
}

.page-about .about-dossier {
  align-self: end;
  min-width: 0;
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px solid var(--line-invert);
  background: linear-gradient(160deg, rgba(27, 58, 87, 0.62), rgba(8, 26, 43, 0.46));
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.page-about .about-dossier__title {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--teal);
}

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

.page-about .about-dossier__list > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(199, 208, 203, 0.14);
}

.page-about .about-dossier__list > div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-dossier__list dt {
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--fog);
}

.page-about .about-dossier__list dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--score);
  white-space: nowrap;
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.9fr);
    align-items: end;
  }
}

/* ---------- 主体分屏 ---------- */
.page-about .about-body {
  padding: clamp(38px, 5.5vw, 84px) 0 clamp(54px, 7vw, 104px);
}

.page-about .about-body__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 48px);
}

.page-about .about-rail {
  min-width: 0;
}

.page-about .about-rail__inner {
  padding-left: 18px;
  border-left: 1px solid var(--line);
}

.page-about .about-rail__inner .eyebrow {
  display: block;
  margin: 0 0 4px;
  color: var(--grass);
  letter-spacing: 0.18em;
}

.page-about .about-toc {
  display: grid;
  margin: 10px 0 26px;
}

.page-about .about-toc a {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 6px;
  align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 14px;
  color: var(--ink-text);
  text-decoration: none;
  transition: color 190ms ease, transform 190ms ease;
}

.page-about .about-toc a span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--grass);
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--grass-deep);
  transform: translateX(3px);
}

.page-about .about-toc a:focus-visible {
  outline: 2px solid var(--whistle);
  outline-offset: 3px;
}

.page-about .about-rail__figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  aspect-ratio: 4 / 5;
  max-height: 280px;
  border: 1px solid var(--line);
}

.page-about .about-rail__figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-rail__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(8, 26, 43, 0.42), rgba(20, 86, 58, 0.16));
  pointer-events: none;
}

.page-about .about-flow {
  min-width: 0;
  display: grid;
  gap: clamp(46px, 6vw, 92px);
}

@media (min-width: 1000px) {
  .page-about .about-body__grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(38px, 5vw, 76px);
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: calc(var(--band-h) + 30px);
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  scroll-margin-top: calc(var(--band-h) + 24px);
}

.page-about .about-section__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: clamp(18px, 2.4vw, 28px);
  padding-bottom: 13px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-section__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--grass);
}

.page-about .about-section h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.9vw, 2.3rem);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: 0.01em;
  color: var(--ink-text);
}

.page-about .about-section__lede {
  max-width: 42rem;
  margin: 0 0 clamp(22px, 3vw, 34px);
  font-size: clamp(0.975rem, 1.1vw, 1.0625rem);
  line-height: 1.9;
  color: var(--ink-text);
}

.page-about .about-section__body {
  max-width: 42rem;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.9;
  color: rgba(16, 35, 28, 0.82);
}

.page-about .about-subhead {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2vw, 1.4rem);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ink-text);
}

/* ---------- 01 起点 ---------- */
.page-about .about-cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 2.6vw, 32px);
}

.page-about .about-col {
  padding: 2px 0 2px 20px;
  border-left: 2px solid var(--line);
}

.page-about .about-col:nth-child(1) {
  border-left-color: var(--grass);
}

.page-about .about-col:nth-child(2) {
  border-left-color: var(--teal);
}

.page-about .about-col h3 {
  margin: 0 0 9px;
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ink-text);
}

.page-about .about-col p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(16, 35, 28, 0.82);
}

.page-about .about-note {
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: 14px 0 14px 20px;
  border-left: 2px solid var(--gold);
  font-size: clamp(1.02rem, 1.6vw, 1.28rem);
  font-weight: 700;
  line-height: 1.65;
  color: var(--grass-deep);
}

@media (min-width: 720px) {
  .page-about .about-cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 02 时间刻度 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 16px;
  bottom: 20px;
  left: 7px;
  width: 1px;
  background: linear-gradient(180deg, var(--grass), var(--teal) 52%, var(--gold));
  opacity: 0.55;
}

.page-about .about-tl {
  position: relative;
  padding-left: 32px;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 22px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--score);
  border: 2px solid var(--grass);
}

.page-about .about-tl:last-child::before {
  border-color: var(--gold);
}

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

.page-about .about-tl__item summary {
  display: grid;
  grid-template-columns: var(--about-year-w) minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 14px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-tl__item summary:focus-visible {
  outline: 2px solid var(--whistle);
  outline-offset: 4px;
}

.page-about .about-tl__year {
  font-family: var(--font-mono);
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--grass-deep);
}

.page-about .about-tl__label {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink-text);
}

.page-about .about-tl__hint::before {
  content: "＋";
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--teal);
  transition: color 190ms ease;
}

.page-about .about-tl__item[open] .about-tl__hint::before {
  content: "－";
  color: var(--whistle);
}

.page-about .about-tl__body {
  padding: 0 0 20px calc(var(--about-year-w) + 14px);
}

.page-about .about-tl__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.88;
  color: rgba(16, 35, 28, 0.8);
}

/* ---------- 03 团队 ---------- */
.page-about .about-teams {
  list-style: none;
  margin: 0 0 clamp(26px, 3.2vw, 38px);
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border-block: 1px solid var(--line-soft);
}

.page-about .about-teams li {
  display: grid;
  gap: 6px;
  padding: 20px 22px;
  background: var(--score);
}

.page-about .about-teams__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--teal);
}

.page-about .about-teams h3 {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--ink-text);
}

.page-about .about-teams p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(16, 35, 28, 0.8);
}

.page-about .about-figure {
  margin: 0 0 clamp(26px, 3.4vw, 42px);
}

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

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: rgba(16, 35, 28, 0.58);
}

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

.page-about .about-steps li {
  display: grid;
  grid-template-columns: 5.6rem minmax(0, 1fr);
  gap: 2px 14px;
  padding: 15px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-steps li > span {
  grid-row: 1 / span 2;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--grass);
}

.page-about .about-steps li strong {
  font-size: 1rem;
  color: var(--ink-text);
}

.page-about .about-steps li p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(16, 35, 28, 0.8);
}

@media (min-width: 720px) {
  .page-about .about-teams {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 599px) {
  .page-about .about-steps li {
    grid-template-columns: 4.2rem minmax(0, 1fr);
  }
}

/* ---------- 04 协作网络 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: 0 0 clamp(24px, 3vw, 36px);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-stats li {
  display: grid;
  gap: 7px;
  padding: 18px 16px;
  background: var(--score);
}

.page-about .about-stats strong {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 2.6vw, 2.05rem);
  font-weight: 600;
  line-height: 1;
  color: var(--grass-deep);
}

.page-about .about-stats li:nth-child(2) strong {
  color: var(--teal);
}

.page-about .about-stats li:nth-child(3) strong {
  color: var(--whistle);
}

.page-about .about-stats li:nth-child(4) strong {
  color: var(--gold);
}

.page-about .about-stats span {
  font-size: 12.5px;
  line-height: 1.6;
  color: rgba(16, 35, 28, 0.66);
}

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 05 长期合作 ---------- */
.page-about .about-section--dark {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 3.6vw, 46px);
  color: var(--score);
  background:
    radial-gradient(85% 130% at 100% 0%, rgba(201, 162, 39, 0.22), transparent 62%),
    linear-gradient(158deg, var(--ink) 0%, var(--ink-2) 100%);
}

.page-about .about-section--dark .about-section__head {
  border-bottom-color: rgba(199, 208, 203, 0.18);
}

.page-about .about-section--dark .about-section__num {
  color: var(--gold);
}

.page-about .about-section--dark h2 {
  color: var(--score);
}

.page-about .about-section--dark .about-section__lede {
  color: rgba(247, 249, 246, 0.82);
  margin-bottom: clamp(20px, 2.6vw, 30px);
}

.page-about .about-rules {
  list-style: none;
  margin: 0 0 clamp(24px, 3vw, 36px);
  padding: 0;
}

.page-about .about-rules li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 13px;
  padding: 14px 0;
  border-top: 1px solid rgba(199, 208, 203, 0.16);
  font-size: 15px;
  line-height: 1.82;
  color: rgba(247, 249, 246, 0.86);
}

.page-about .about-rules li::before {
  content: "▸";
  font-size: 12px;
  line-height: 2.2;
  color: var(--gold);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 14px;
}

.page-about .about-actions__hint {
  flex: 1 1 100%;
  margin: 4px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(247, 249, 246, 0.66);
}

.page-about .about-actions__hint a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 178, 122, 0.45);
  transition: border-color 180ms ease, color 180ms ease;
}

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

@media (min-width: 640px) {
  .page-about .about-actions__hint {
    flex: 1 1 auto;
    margin: 0 0 0 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc a,
  .page-about .about-hero__crumb a,
  .page-about .about-actions__hint a {
    transition: none;
  }

  .page-about .about-toc a:hover,
  .page-about .about-toc a:focus-visible {
    transform: none;
  }
}
<<<END>>>