.page-about {
  --about-line: rgba(143, 161, 181, 0.18);
  --about-line-soft: rgba(143, 161, 181, 0.28);
  --about-text: rgba(242, 246, 250, 0.86);
  --about-text-dim: rgba(242, 246, 250, 0.68);
  display: block;
  position: relative;
  padding-bottom: 96px;
  background:
    radial-gradient(1100px 620px at 82% -12%, rgba(47, 224, 212, 0.10), transparent 62%),
    radial-gradient(760px 520px at 4% 38%, rgba(196, 56, 74, 0.07), transparent 65%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 42%, var(--ink-900) 100%);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: 26px;
}

.page-about .about-hero .crumbs {
  margin-bottom: 20px;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: 28px;
  padding: 30px 20px 30px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-xl);
  background: linear-gradient(158deg, rgba(18, 48, 85, 0.60), rgba(5, 11, 22, 0.45) 72%);
  box-shadow: 0 40px 84px -56px rgba(5, 11, 22, 0.98);
  overflow: hidden;
}

.page-about .about-hero__grid::before {
  content: "";
  position: absolute;
  left: 30px;
  right: 30px;
  top: 13px;
  height: 6px;
  background-image: repeating-linear-gradient(90deg, rgba(143, 161, 181, 0.42) 0 1px, transparent 1px 15px);
  opacity: 0.85;
}

.page-about .about-hero__grid::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 96px;
  background: linear-gradient(180deg, var(--accent), transparent);
  border-radius: 0 4px 4px 0;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--accent);
  text-transform: uppercase;
}

.page-about .about-hero__eyebrow .mono {
  font-family: var(--font-mono);
  color: var(--lime);
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-serif);
  font-size: clamp(29px, 7.2vw, 52px);
  line-height: 1.22;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 0 0 14px;
  max-width: 34em;
  font-size: 16.5px;
  line-height: 1.95;
  color: var(--about-text);
}

.page-about .about-hero__sub {
  margin: 0 0 26px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

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

.page-about .about-figure {
  margin: 0;
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink-700);
  border: 1px solid var(--about-line);
}

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

.page-about .about-figure--hero {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--wide {
  aspect-ratio: 8 / 3;
  border-radius: var(--radius-md);
  margin: 26px 0 28px;
}

.page-about .about-figure--team {
  aspect-ratio: 10 / 7;
}

.page-about .about-strip {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-strip li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 18px 20px;
  background: rgba(5, 11, 22, 0.76);
}

.page-about .about-strip strong {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--lime);
}

.page-about .about-strip span {
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 34px;
  padding-top: 60px;
}

.page-about .about-rail {
  padding: 16px 14px 18px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-lg);
  background: rgba(5, 11, 22, 0.6);
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  padding-left: 12px;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-rail__list a {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  font-size: 14px;
  line-height: 1.5;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.22s var(--ease), background 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-rail__list a:hover {
  color: var(--paper);
  background: rgba(18, 48, 85, 0.55);
}

.page-about .about-rail__list a[aria-current="true"] {
  color: var(--accent);
  border-left-color: var(--accent);
  background: rgba(47, 224, 212, 0.09);
}

.page-about .about-rail__idx {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .about-rail__list a[aria-current="true"] .about-rail__idx {
  color: var(--lime);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding-bottom: 76px;
}

.page-about .about-chapter + .about-chapter {
  padding-top: 62px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-chapter__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-bottom: 26px;
}

.page-about .about-chapter__idx {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--accent);
}

.page-about .about-chapter__idx::after {
  content: "";
  width: 44px;
  height: 1px;
  background: var(--sichuan);
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(23px, 4.6vw, 34px);
  line-height: 1.32;
  color: var(--paper);
}

.page-about .about-chapter p {
  margin: 0 0 20px;
  max-width: 66ch;
  font-size: 16.5px;
  line-height: 1.95;
  color: var(--about-text);
}

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

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 20px;
  bottom: 20px;
  width: 1px;
  background: linear-gradient(180deg, var(--accent), rgba(47, 224, 212, 0.16) 68%, transparent);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 36px;
}

.page-about .about-timeline__item + .about-timeline__item {
  border-top: 1px solid var(--about-line);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--about-line-soft);
  z-index: 1;
  transition: border-color 0.24s var(--ease), box-shadow 0.24s var(--ease);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(47, 224, 212, 0.13);
}

.page-about .about-year__sum {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr) 18px;
  gap: 12px;
  align-items: center;
  padding: 20px 6px 20px 2px;
  border-radius: var(--radius-sm);
  transition: background 0.22s var(--ease);
}

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

.page-about .about-year__sum:hover {
  background: rgba(18, 48, 85, 0.45);
}

.page-about .about-year__year {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--accent);
}

.page-about .about-year__label {
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-year__hint {
  position: relative;
  justify-self: end;
  width: 14px;
  height: 14px;
}

.page-about .about-year__hint::before,
.page-about .about-year__hint::after {
  content: "";
  position: absolute;
  background: var(--muted);
  transition: transform 0.24s var(--ease), background 0.24s var(--ease);
}

.page-about .about-year__hint::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 1.5px;
}

.page-about .about-year__hint::after {
  left: 6px;
  top: 0;
  width: 1.5px;
  height: 14px;
}

.page-about .about-year[open] .about-year__hint::after {
  transform: scaleY(0);
}

.page-about .about-year[open] .about-year__hint::before {
  background: var(--accent);
}

.page-about .about-year[open] .about-year__label {
  color: var(--accent);
}

.page-about .about-year__body {
  padding: 0 6px 24px 2px;
}

.page-about .about-year__body p {
  max-width: 62ch;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.95;
  color: var(--about-text-dim);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 24px;
  margin-bottom: 30px;
}

.page-about .about-team__copy p {
  font-size: 16px;
}

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

.page-about .about-crew {
  position: relative;
  padding: 24px 22px 26px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(18, 48, 85, 0.62), rgba(5, 11, 22, 0.52));
  overflow: hidden;
}

.page-about .about-crew::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 44px;
  height: 44px;
  background: rgba(47, 224, 212, 0.16);
  clip-path: polygon(100% 0, 24% 0, 100% 76%);
}

.page-about .about-crew__no {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--bamboo);
}

.page-about .about-crew__name {
  margin: 10px 0 10px;
  font-family: var(--font-serif);
  font-size: 20px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-crew p {
  max-width: none;
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--about-text-dim);
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 14px;
  margin: 28px 0 30px;
}

.page-about .about-partners__col {
  padding: 26px 22px 28px;
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-md);
  background: rgba(18, 48, 85, 0.38);
}

.page-about .about-partners__col--bamboo {
  border-left-color: var(--bamboo);
}

.page-about .about-partners__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 46px;
  line-height: 1;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--lime);
}

.page-about .about-partners__col--bamboo .about-partners__num {
  color: var(--accent);
}

.page-about .about-partners__name {
  margin: 12px 0 10px;
  font-family: var(--font-serif);
  font-size: 19px;
  color: var(--paper);
}

.page-about .about-partners__col p {
  max-width: none;
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--about-text-dim);
}

.page-about .about-quote {
  margin: 0 0 26px;
  padding: 22px 22px 22px 24px;
  border-left: 3px solid var(--sichuan);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: linear-gradient(100deg, rgba(196, 56, 74, 0.16), rgba(5, 11, 22, 0.12));
}

.page-about .about-quote p {
  margin: 0;
  max-width: 40ch;
  font-family: var(--font-serif);
  font-size: 19px;
  line-height: 1.85;
  color: var(--paper);
}

/* ---------- 服务节奏 ---------- */
.page-about .about-service {
  list-style: none;
  margin: 26px 0 30px;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-service li {
  display: grid;
  gap: 6px;
  padding: 18px 4px;
  background: rgba(5, 11, 22, 0.42);
}

.page-about .about-service__k {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--accent);
}

.page-about .about-service__v {
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--about-text);
}

.page-about .about-fold {
  border: 1px solid var(--about-line);
  border-radius: var(--radius-lg);
  background: rgba(18, 48, 85, 0.35);
  overflow: hidden;
}

.page-about .about-fold__sum {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 20px;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--paper);
  transition: background 0.22s var(--ease);
}

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

.page-about .about-fold__sum::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--accent);
}

.page-about .about-fold[open] .about-fold__sum::after {
  content: "−";
}

.page-about .about-fold__sum:hover {
  background: rgba(47, 224, 212, 0.08);
}

.page-about .about-fold__body {
  padding: 0 20px 22px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-faq {
  margin: 0;
  padding-top: 20px;
}

.page-about .about-faq dt {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-size: 16.5px;
  line-height: 1.6;
  color: var(--paper);
}

.page-about .about-faq dd {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--about-text-dim);
}

.page-about .about-faq dd:last-child {
  margin-bottom: 0;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: 34px;
  padding: 30px 22px 32px;
  border: 1px solid rgba(47, 224, 212, 0.3);
  border-radius: var(--radius-xl);
  background: linear-gradient(150deg, rgba(47, 224, 212, 0.16), rgba(18, 48, 85, 0.6) 58%, rgba(5, 11, 22, 0.62));
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-serif);
  font-size: 22px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 0 0 22px;
  max-width: 52ch;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--about-text);
}

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

/* ---------- 返回顶部 ---------- */
.page-about .totop {
  position: fixed;
  right: 18px;
  bottom: 22px;
  z-index: 40;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: var(--r-pill);
  border: 1px solid rgba(47, 224, 212, 0.4);
  background: rgba(5, 11, 22, 0.86);
  text-decoration: none;
  transition: background 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-about .totop:hover {
  background: rgba(47, 224, 212, 0.16);
  transform: translateY(-3px);
}

.page-about .totop__arrow {
  width: 10px;
  height: 10px;
  border-left: 1.5px solid var(--accent);
  border-top: 1.5px solid var(--accent);
  transform: rotate(45deg) translate(1px, 1px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-crews {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-cta {
    padding: 36px 32px 38px;
  }
}

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

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

  .page-about .about-hero__grid {
    padding: 40px 32px 40px;
    gap: 34px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 40px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: center;
    gap: 48px;
    padding: 46px 40px 46px 44px;
  }

  .page-about .about-hero__lede {
    font-size: 17px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    align-items: center;
    gap: 34px;
  }

  .page-about .about-service li {
    grid-template-columns: 190px minmax(0, 1fr);
    align-items: baseline;
    gap: 20px;
    padding: 20px 4px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    gap: 54px;
    align-items: start;
    padding-top: 78px;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--head-h) + 28px);
  }

  .page-about .about-chapter {
    padding-bottom: 92px;
  }

  .page-about .about-chapter + .about-chapter {
    padding-top: 76px;
  }

  .page-about .about-cta {
    padding: 44px 42px 46px;
  }
}
<<<END>>>