.page-about {
  --about-ink-line: rgba(217, 201, 168, 0.14);
  --about-paper-line: rgba(11, 26, 42, 0.16);
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-body);
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about .about-crumb {
  padding-top: clamp(0.9rem, 2.4vw, 1.5rem);
}

/* ---------- 封面 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.75rem, 4.5vw, 3.5rem) 0 clamp(2.25rem, 5.5vw, 4rem);
  background:
    radial-gradient(120% 90% at 82% 0%, var(--ink-700) 0%, var(--ink-800) 52%, var(--ink-900) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(217, 201, 168, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(217, 201, 168, 0.07) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(to bottom, #000 10%, transparent 88%);
  mask-image: linear-gradient(to bottom, #000 10%, transparent 88%);
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-hero__title {
  margin: 0.85rem 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.4rem, 8.6vw, 5.4rem);
  line-height: 0.98;
  letter-spacing: -0.03em;
  color: var(--paper-hi);
}

.page-about .about-hero__accent {
  color: var(--gold);
  border-bottom: 4px solid var(--cinnabar);
  padding-bottom: 0.04em;
}

.page-about .about-hero__lede {
  margin: clamp(1rem, 2.6vw, 1.6rem) 0 0;
  max-width: 36em;
  font-size: clamp(0.95rem, 1.6vw, 1.06rem);
  line-height: 1.85;
  color: var(--paper);
}

.page-about .about-hero__years {
  list-style: none;
  margin: clamp(1.4rem, 3vw, 2.2rem) 0 0;
  padding: 1rem 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem 1rem;
}

.page-about .about-hero__years li {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.page-about .about-hero__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--gold);
  letter-spacing: 0.02em;
}

.page-about .about-hero__yearnote {
  font-size: 0.78rem;
  color: var(--mist);
  letter-spacing: 0.04em;
}

.page-about .about-hero__card {
  position: relative;
  margin: 0;
  padding: 0.6rem;
  background: rgba(18, 49, 77, 0.45);
  border: 1px solid var(--line-gold);
  box-shadow: var(--shadow-card);
}

.page-about .about-hero__card::after {
  content: "";
  position: absolute;
  right: -1px;
  top: -1px;
  width: 46px;
  height: 46px;
  border-top: 2px solid var(--cinnabar);
  border-right: 2px solid var(--cinnabar);
  pointer-events: none;
}

.page-about .about-hero__img {
  width: 100%;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-hero__cap {
  padding-top: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
}

@media (min-width: 640px) {
  .page-about .about-hero__years {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (min-width: 940px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: end;
  }
}

/* ---------- 侧轨 + 内容 ---------- */
.page-about .about-shell {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
  padding-top: clamp(1.5rem, 3.5vw, 2.5rem);
  padding-bottom: clamp(2rem, 5vw, 4rem);
}

.page-about .about-rail__title {
  margin: 0 0 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  color: var(--mist);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0.35rem;
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__link {
  display: block;
  padding: 0.45rem 0.8rem;
  border: 1px solid var(--about-ink-line);
  color: var(--paper);
  font-size: 0.84rem;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-rail__link:hover {
  color: var(--gold);
  border-color: var(--line-gold);
}

.page-about .about-rail__link[aria-current="true"] {
  color: var(--gold);
  border-color: var(--line-gold);
  background: rgba(201, 162, 75, 0.1);
}

.page-about .about-body {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2.25rem);
  min-width: 0;
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 1.5rem;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    border: 0;
    border-left: 2px solid transparent;
    padding: 0.55rem 0.75rem;
  }

  .page-about .about-rail__link[aria-current="true"] {
    border-left-color: var(--cinnabar);
    background: rgba(201, 162, 75, 0.08);
  }
}

/* ---------- 分区壳 ---------- */
.page-about .about-sec {
  position: relative;
  padding: clamp(1.25rem, 3.4vw, 2.6rem);
  border: 1px solid var(--about-ink-line);
  background: rgba(11, 26, 42, 0.5);
}

.page-about .about-sec--paper {
  background: var(--paper);
  color: var(--ink-text);
  border-color: var(--about-paper-line);
  box-shadow: var(--shadow-card);
}

.page-about .about-sec--ink9 {
  background: #050C14;
}

.page-about .about-sec__head {
  margin-bottom: clamp(1.15rem, 3vw, 1.9rem);
}

.page-about .about-sec .h2 {
  margin: 0.5rem 0 0;
  font-size: clamp(1.5rem, 3.6vw, 2.25rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--paper-hi);
}

.page-about .about-sec--paper .h2 {
  color: var(--ink-900);
}

.page-about .about-sec--paper .eyebrow {
  color: var(--cinnabar);
}

.page-about .about-sec__note {
  margin: 0.85rem 0 0;
  max-width: 38em;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-sec--paper .about-sec__note {
  color: var(--ink-text-soft);
}

/* ---------- 时间轴 ---------- */
.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl__item {
  position: relative;
  padding-left: 1.5rem;
  padding-bottom: 1.1rem;
}

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

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7rem;
  width: 9px;
  height: 9px;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(201, 162, 75, 0.16);
}

.page-about .tl__item::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 1.5rem;
  bottom: 0.15rem;
  width: 1px;
  background: var(--about-ink-line);
}

.page-about .tl__item:last-child::after {
  display: none;
}

.page-about .tl__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.3rem 0.9rem;
  padding: 0.1rem 0 0.35rem;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.3rem, 3.4vw, 1.85rem);
  font-weight: 500;
  color: var(--gold);
  letter-spacing: -0.01em;
}

.page-about .tl__label {
  font-size: 1rem;
  font-weight: 600;
  color: var(--paper-hi);
  transition: color 0.2s var(--ease);
}

.page-about .tl__summary:hover .tl__label {
  color: var(--gold);
}

.page-about .tl__chev {
  margin-left: auto;
  align-self: center;
  width: 0.8rem;
  height: 0.8rem;
  border-right: 1px solid var(--mist);
  border-bottom: 1px solid var(--mist);
  transform: rotate(45deg);
  transition: transform 0.25s var(--ease);
}

.page-about .tl__node[open] .tl__chev {
  transform: rotate(225deg);
}

.page-about .tl__panel {
  padding: 0.3rem 0 0.2rem;
  color: var(--paper);
}

.page-about .tl__panel p {
  margin: 0;
  max-width: 40em;
  font-size: 0.93rem;
  line-height: 1.85;
  opacity: 0.88;
}

/* ---------- 三个阶段 ---------- */
.page-about .stages {
  display: grid;
}

.page-about .stage {
  display: grid;
  gap: 0.55rem;
  padding: clamp(1rem, 2.6vw, 1.6rem) 0;
  border-top: 1px solid var(--about-paper-line);
}

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

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

.page-about .stage__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  color: var(--cinnabar);
}

.page-about .stage__title {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
  line-height: 1.4;
  color: var(--ink-900);
}

.page-about .stage__text {
  margin: 0;
  max-width: 36em;
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--ink-text-soft);
}

.page-about .stage__list {
  list-style: none;
  margin: 0.55rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.4rem;
}

.page-about .stage__list li {
  position: relative;
  padding-left: 0.9rem;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--ink-text-soft);
}

.page-about .stage__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 5px;
  height: 5px;
  background: var(--gold);
}

@media (min-width: 820px) {
  .page-about .stage {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
    gap: 0.6rem 2.5rem;
    padding: 1.8rem 0;
  }

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

  .page-about .stage__list {
    margin-top: 1.6rem;
  }
}

/* ---------- 团队 ---------- */
.page-about .team {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
}

.page-about .team__figure {
  margin: 0;
  padding: 0.5rem;
  background: rgba(18, 49, 77, 0.4);
  border: 1px solid var(--line);
}

.page-about .team__img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .team__total {
  margin: 0 0 1.1rem;
  font-size: 0.95rem;
  color: var(--paper);
}

.page-about .team__totalnum {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2rem, 5vw, 2.9rem);
  font-weight: 500;
  color: var(--gold);
  margin-right: 0.45rem;
  letter-spacing: -0.02em;
}

.page-about .meter {
  display: grid;
  gap: 0.85rem;
}

.page-about .meter__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 0.35rem;
}

.page-about .meter__label {
  font-size: 0.88rem;
  color: var(--paper);
}

.page-about .meter__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.82rem;
  color: var(--mist);
}

.page-about .meter__bar {
  height: 6px;
  background: rgba(217, 201, 168, 0.16);
}

.page-about .meter__fill {
  display: block;
  height: 100%;
  background: var(--gold);
}

.page-about .meter__fill--ops {
  width: 47%;
}

.page-about .meter__fill--tech {
  width: 31%;
  background: var(--jade);
}

.page-about .meter__fill--cs {
  width: 22%;
  background: var(--cinnabar);
}

.page-about .flow {
  list-style: none;
  margin: 1.4rem 0 0;
  padding: 1.1rem 0 0;
  border-top: 1px solid var(--about-ink-line);
  display: grid;
  gap: 0.7rem;
}

.page-about .flow__step {
  display: flex;
  gap: 0.7rem;
  align-items: flex-start;
  font-size: 0.87rem;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .flow__idx {
  flex: 0 0 auto;
  padding: 0.05rem 0.5rem;
  border: 1px solid var(--line-gold);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .team__note {
  margin: 1.2rem 0 0;
  font-size: 0.85rem;
  line-height: 1.75;
  color: var(--mist);
}

@media (min-width: 820px) {
  .page-about .team {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 合作生态 ---------- */
.page-about .eco {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.page-about .eco__link {
  display: block;
  height: 100%;
  padding: 1rem 1.1rem;
  border: 1px solid var(--about-ink-line);
  background: rgba(18, 49, 77, 0.32);
  text-decoration: none;
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .eco__link:hover,
.page-about .eco__link:focus-visible {
  transform: translateY(-2px);
  border-color: var(--line-gold);
  background: rgba(18, 49, 77, 0.72);
}

.page-about .eco__name {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--paper-hi);
}

.page-about .eco__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gold);
}

.page-about .eco__dot--jade {
  background: var(--jade);
}

.page-about .eco__desc {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.85rem;
  line-height: 1.75;
  color: var(--mist);
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .eco__link:hover .eco__desc,
.page-about .eco__link:focus-visible .eco__desc,
.page-about .eco__link:focus .eco__desc {
  opacity: 1;
  transform: none;
}

.page-about .partners-figure {
  margin: clamp(1.25rem, 3vw, 1.9rem) 0 0;
  padding-top: clamp(1.1rem, 2.6vw, 1.6rem);
  border-top: 1px solid var(--about-ink-line);
}

.page-about .partners-figure__img {
  width: 100%;
  aspect-ratio: 11 / 7;
  object-fit: cover;
}

.page-about .partners-figure__cap {
  margin-top: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--mist);
}

@media (min-width: 700px) {
  .page-about .eco {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (hover: none) {
  .page-about .eco__desc {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 服务节奏 ---------- */
.page-about .rhythm {
  display: grid;
}

.page-about .rhythm__row {
  display: grid;
  gap: 0.15rem;
  padding: 0.9rem 0;
  border-top: 1px solid var(--about-paper-line);
}

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

.page-about .rhythm__key {
  font-size: 0.93rem;
  font-weight: 600;
  color: var(--ink-900);
}

.page-about .rhythm__val {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--cinnabar);
}

.page-about .rhythm__note {
  font-size: 0.85rem;
  line-height: 1.72;
  color: var(--ink-text-soft);
}

.page-about .rhythm__foot {
  margin: clamp(1.1rem, 2.6vw, 1.6rem) 0 0;
  padding-top: 0.9rem;
  border-top: 1px solid var(--about-paper-line);
  font-size: 0.88rem;
  color: var(--ink-text-soft);
}

.page-about .rhythm__link {
  color: var(--ink-900);
  text-decoration: none;
  border-bottom: 1px solid var(--cinnabar);
  margin: 0 0.15em;
}

.page-about .rhythm__link:hover {
  color: var(--cinnabar);
}

@media (min-width: 780px) {
  .page-about .rhythm__row {
    grid-template-columns: 10rem 12rem minmax(0, 1fr);
    align-items: baseline;
    gap: 0.4rem 1.5rem;
  }
}

/* ---------- 下一步 ---------- */
.page-about .about-cta {
  padding: clamp(1.35rem, 3.4vw, 2.4rem);
  border: 1px solid var(--line-gold);
  background: linear-gradient(135deg, rgba(18, 49, 77, 0.92), rgba(5, 12, 20, 0.96));
}

.page-about .about-cta .h2 {
  margin: 0;
  font-size: clamp(1.4rem, 3.4vw, 2rem);
  line-height: 1.25;
  color: var(--paper-hi);
}

.page-about .about-cta__text {
  margin: 0.8rem 0 0;
  max-width: 42em;
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--paper);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.2rem;
}

.page-about .about-cta__links .btn {
  text-decoration: none;
}
<<<END>>>