.page-about {
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

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

.page-about h1,
.page-about h2,
.page-about h3 {
  letter-spacing: -0.01em;
}

.page-about a {
  color: inherit;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  max-width: var(--max);
  margin-inline: auto;
  padding: 20px 18px 26px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 26px;
  align-items: center;
  margin-top: 14px;
}

.page-about .about-eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--grass);
}

.page-about h1 {
  margin: 12px 0 0;
  font-size: clamp(30px, 6.4vw, 44px);
  line-height: 1.12;
  font-weight: 800;
}

.page-about .about-lead {
  margin: 16px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.76);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-hero__figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
}

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

.page-about .about-facts {
  list-style: none;
  margin: 30px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 16px;
}

.page-about .about-facts__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
  color: var(--grass);
  font-variant-numeric: tabular-nums;
}

.page-about .about-facts__unit {
  font-size: 15px;
  margin-left: 2px;
}

.page-about .about-facts__label {
  display: block;
  margin-top: 7px;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.58);
}

/* ---------- 主体栅格 ---------- */

.page-about .about-body {
  max-width: var(--max);
  margin-inline: auto;
  padding: 12px 18px 60px;
  display: grid;
  gap: 30px;
}

.page-about .about-toc {
  align-self: start;
}

.page-about .about-toc__title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--graphite);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px;
}

.page-about .about-toc__list a {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 7px;
  align-items: baseline;
  padding: 9px 10px;
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  font-size: 13px;
  line-height: 1.45;
  text-decoration: none;
  color: rgba(255, 255, 255, 0.68);
  transition: color 180ms var(--ease), background 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--white);
  background: rgba(47, 191, 106, 0.1);
  border-left-color: var(--grass);
  outline: none;
}

.page-about .about-toc__list a span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--track);
}

/* ---------- 章节 ---------- */

.page-about .about-sec {
  border-top: 1px solid var(--line-soft);
  padding-top: 26px;
  margin-top: 42px;
}

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
  margin-top: 0;
}

.page-about .about-sec__kicker {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0;
}

.page-about .about-sec__num {
  font-family: var(--font-mono);
  font-size: clamp(38px, 8vw, 54px);
  font-weight: 700;
  line-height: 0.9;
  color: var(--track);
  font-variant-numeric: tabular-nums;
}

.page-about .about-sec__tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--graphite);
}

.page-about .about-sec h2 {
  margin: 14px 0 0;
  font-size: clamp(23px, 4.2vw, 29px);
  line-height: 1.22;
  font-weight: 800;
}

.page-about .about-prose p {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(255, 255, 255, 0.76);
}

.page-about .about-prose p:first-child {
  margin-top: 16px;
}

.page-about .about-prose a,
.page-about .about-hint a {
  color: var(--grass);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 时间轴 ---------- */

.page-about .timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 28px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--track) 0%, var(--grass) 55%, rgba(201, 209, 217, 0.16) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: 26px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 5px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--track);
  box-shadow: 0 0 0 4px rgba(255, 107, 26, 0.12);
}

.page-about .timeline__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--track);
  font-variant-numeric: tabular-nums;
}

.page-about .timeline__title {
  margin: 5px 0 0;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.35;
}

.page-about .timeline__text {
  margin: 7px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(255, 255, 255, 0.72);
}

.page-about .timeline__more {
  margin-top: 10px;
}

.page-about .timeline__more summary {
  display: inline-block;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--grass);
  padding: 4px 12px;
  border: 1px solid rgba(47, 191, 106, 0.4);
  border-radius: var(--radius-pill);
  list-style: none;
  transition: background 180ms var(--ease), border-color 180ms var(--ease);
}

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

.page-about .timeline__more summary:hover,
.page-about .timeline__more summary:focus-visible {
  background: rgba(47, 191, 106, 0.14);
  border-color: var(--grass);
  outline: none;
}

.page-about .timeline__more[open] summary {
  background: rgba(47, 191, 106, 0.16);
  border-color: var(--grass);
}

.page-about .timeline__more p {
  margin: 10px 0 0;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: var(--ink-2);
  border-left: 2px solid var(--grass);
  font-size: 14px;
  line-height: 1.72;
  color: rgba(255, 255, 255, 0.72);
}

/* ---------- 校对流程 ---------- */

.page-about .about-review {
  margin-top: 24px;
  display: grid;
  gap: 20px;
}

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

.page-about .flow__step {
  position: relative;
  padding: 20px 18px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line);
}

.page-about .flow__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--track);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
}

.page-about .flow__step h3 {
  margin: 12px 0 0;
  font-size: 17px;
  font-weight: 700;
}

.page-about .flow__step p {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(255, 255, 255, 0.72);
}

.page-about .about-review__figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
}

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

/* ---------- 团队 ---------- */

.page-about .team {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .team__card {
  padding: 20px 18px;
  border-radius: var(--radius-md);
  background: var(--ink-2);
  border: 1px solid var(--line);
}

.page-about .team__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 38px;
  font-weight: 700;
  line-height: 1;
  color: var(--grass);
  font-variant-numeric: tabular-nums;
}

.page-about .team__card h3 {
  margin: 12px 0 0;
  font-size: 15.5px;
  letter-spacing: 0.05em;
  font-weight: 700;
}

.page-about .team__card p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(255, 255, 255, 0.68);
}

/* ---------- 服务半径（米白纸面） ---------- */

.page-about .about-paper {
  margin-top: 22px;
  padding: 22px;
  border-radius: var(--radius-lg);
  background: var(--paper);
  color: var(--ink);
  display: grid;
  gap: 20px;
}

.page-about .about-paper__text p {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.8;
  color: #2c3648;
}

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

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

.page-about .about-paper__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  object-fit: cover;
}

/* ---------- 关注流 ---------- */

.page-about .follow-steps {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .follow-steps li {
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  background: rgba(47, 191, 106, 0.07);
  border: 1px solid rgba(47, 191, 106, 0.22);
  font-size: 14px;
  line-height: 1.62;
  color: rgba(255, 255, 255, 0.82);
}

.page-about .follow-steps li span {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--grass);
}

.page-about .about-hint {
  margin: 18px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(255, 255, 255, 0.66);
}

/* ---------- 收尾入口 ---------- */

.page-about .about-next {
  margin-top: 44px;
  padding: 26px 20px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background:
    radial-gradient(120% 140% at 0% 0%, rgba(255, 107, 26, 0.16), transparent 62%),
    radial-gradient(120% 140% at 100% 100%, rgba(47, 191, 106, 0.16), transparent 60%),
    var(--ink-2);
}

.page-about .about-next h2 {
  margin: 0;
  font-size: clamp(20px, 3.6vw, 25px);
  line-height: 1.3;
  font-weight: 800;
}

.page-about .about-next p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(255, 255, 255, 0.72);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 760px) {
  .page-about .about-hero {
    padding: 26px 24px 34px;
  }

  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-body {
    padding: 16px 24px 72px;
  }

  .page-about .about-facts__num {
    font-size: 36px;
  }

  .page-about .flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .flow__step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 34px;
    right: -22px;
    width: 22px;
    height: 2px;
    background: linear-gradient(90deg, var(--track), rgba(255, 107, 26, 0.15));
  }

  .page-about .team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

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

  .page-about .about-paper {
    padding: 30px;
  }

  .page-about .about-next {
    padding: 32px 28px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.08fr 0.92fr;
    gap: 44px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 208px minmax(0, 1fr);
    column-gap: 52px;
    padding-top: 26px;
  }

  .page-about .about-toc {
    position: sticky;
    top: 26px;
  }

  .page-about .about-toc__list {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
  }

  .page-about .about-review {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: start;
    gap: 24px;
  }

  .page-about .about-paper {
    grid-template-columns: 1.12fr 0.88fr;
    align-items: center;
    gap: 28px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-review {
    grid-template-columns: minmax(0, 1fr) 360px;
  }
}

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