.page-about {
  --about-card: rgba(18, 35, 58, 0.9);
  --about-gap: clamp(16px, 4vw, 32px);
  --about-track: 2px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 44px) 0 40px;
  border-bottom: 1px solid var(--line-600);
  background:
    radial-gradient(120% 100% at 8% 0%, rgba(34, 224, 214, 0.16), transparent 58%),
    radial-gradient(90% 90% at 94% 6%, rgba(255, 138, 52, 0.1), transparent 62%),
    var(--ink-950);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(143, 166, 190, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(143, 166, 190, 0.07) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
}

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

.page-about .about-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 22px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__kicker::before {
  content: "";
  width: 20px;
  height: 2px;
  background: var(--cyan);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(34px, 7.6vw, 76px);
  font-weight: 900;
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  max-width: 62ch;
  margin: 22px 0 0;
  font-size: clamp(15px, 1.8vw, 17px);
  line-height: 1.85;
  color: var(--mute);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-600);
  border: 1px solid var(--line-600);
}

.page-about .about-stats__item {
  padding: 14px 14px 16px;
  background: var(--ink-900);
}

.page-about .about-stats__num {
  display: block;
  font-size: clamp(22px, 4.6vw, 32px);
  line-height: 1.1;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stats__label {
  display: block;
  margin-top: 7px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mute);
}

/* ---------- 布局 ---------- */
.page-about .about-layout {
  padding-top: 36px;
  padding-bottom: 80px;
}

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

/* ---------- 侧栏索引 ---------- */
.page-about .about-index {
  margin-bottom: 36px;
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--mute);
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  white-space: nowrap;
  text-decoration: none;
  font-size: 13px;
  color: var(--mute);
  background: var(--ink-900);
  border: 1px solid var(--line-600);
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-index__link .mono {
  font-size: 11px;
  color: var(--cyan);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--paper);
  border-color: var(--cyan);
  outline: none;
}

.page-about .about-index__entry {
  display: none;
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  margin-bottom: 64px;
  scroll-margin-top: calc(var(--header-h) + 24px);
}

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

.page-about .about-sec__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-sec__title {
  margin: 10px 0 14px;
  font-size: clamp(23px, 4.4vw, 38px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-sec__desc {
  max-width: 60ch;
  margin: 0 0 26px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mute);
}

.page-about .about-sec__foot {
  margin: 22px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--amber);
  font-size: 14px;
  line-height: 1.75;
  color: var(--mute);
}

.page-about .about-sec a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 224, 214, 0.45);
}

.page-about .about-sec a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline-wrap {
  position: relative;
  padding: 26px 0 6px;
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.2;
  pointer-events: none;
  filter: saturate(0.65);
  -webkit-clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
}

.page-about .about-timeline {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin: 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 10px;
  bottom: 10px;
  width: var(--about-track);
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(34, 224, 214, 0.12) 100%);
}

.page-about .about-tl__item {
  position: relative;
  padding: 18px 16px 20px;
  background: var(--about-card);
  border: 1px solid var(--line-600);
  -webkit-clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 28px;
  width: 10px;
  height: 10px;
  background: var(--cyan);
  transform: rotate(45deg);
}

.page-about .about-tl__year {
  margin: 0 0 8px;
  font-size: 30px;
  line-height: 1;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.page-about .about-tl__item .tag {
  display: inline-block;
  margin-bottom: 10px;
}

.page-about .about-tl__title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .about-tl__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mute);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 28px;
}

.page-about .about-roles {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .about-role {
  padding: 16px;
  background: var(--ink-900);
  border: 1px solid var(--line-600);
}

.page-about .about-role__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-role__name {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-role__count {
  font-size: 13px;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-role__blocks {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 12px;
}

.page-about .about-role__blk {
  display: block;
  width: 13px;
  height: 13px;
  background: var(--ink-800);
  border: 1px solid var(--line-600);
  transition: background 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-role__blk--cyan {
  background: rgba(34, 224, 214, 0.28);
  border-color: rgba(34, 224, 214, 0.7);
}

.page-about .about-role__blk--acid {
  background: rgba(168, 240, 60, 0.24);
  border-color: rgba(168, 240, 60, 0.65);
}

.page-about .about-role__blk:hover {
  background: var(--paper);
  border-color: var(--paper);
}

.page-about .about-role__note {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mute);
}

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line-600);
}

.page-about .about-figure--tall img {
  aspect-ratio: 3 / 4;
  object-position: center;
}

.page-about .about-figure--wide img {
  aspect-ratio: 3 / 2;
  margin-top: 18px;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.65;
  color: var(--mute);
}

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

.page-about .about-flow__item {
  position: relative;
  padding: 16px 16px 18px;
  background: var(--ink-900);
  border: 1px solid var(--line-600);
  -webkit-clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}

.page-about .about-flow__idx {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .about-flow__title {
  margin: 8px 0 8px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mute);
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 24px;
}

.page-about .about-partners__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 10px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--line-600);
}

.page-about .about-partners__title {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-partners__num {
  font-size: 13px;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

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

.page-about .about-chip {
  padding: 7px 11px;
  font-size: 12px;
  line-height: 1.4;
  color: var(--paper);
  background: var(--ink-800);
  border: 1px solid var(--line-600);
  -webkit-clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
  transition: border-color 160ms var(--ease), transform 160ms var(--ease);
}

.page-about .about-chip--media {
  border-color: rgba(34, 224, 214, 0.42);
}

.page-about .about-chip--data {
  border-color: rgba(255, 138, 52, 0.48);
  color: var(--mute);
}

.page-about .about-chip:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
}

.page-about .about-partners__note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--mute);
}

/* ---------- 覆盖 ---------- */
.page-about .about-coverage {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line-600);
  border: 1px solid var(--line-600);
}

.page-about .about-coverage__item {
  padding: 16px 14px;
  background: var(--ink-900);
}

.page-about .about-coverage__num {
  display: block;
  font-size: 24px;
  line-height: 1.1;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .about-coverage__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  color: var(--mute);
}

.page-about .about-cityline {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 2;
  letter-spacing: 0.02em;
  color: var(--mute);
}

/* ---------- 计划 ---------- */
.page-about .about-plans {
  display: grid;
  gap: 14px;
}

.page-about .about-plan {
  padding: 18px 16px;
  background: linear-gradient(140deg, rgba(34, 224, 214, 0.08), transparent 62%), var(--ink-900);
  border: 1px solid var(--line-600);
  transition: border-color 200ms var(--ease);
}

.page-about .about-plan:hover {
  border-color: rgba(34, 224, 214, 0.6);
}

.page-about .about-plan__idx {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-plan__title {
  margin: 8px 0 8px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-plan__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mute);
}

/* ---------- 收尾 CTA ---------- */
.page-about .about-cta {
  display: grid;
  gap: 20px;
  margin-top: 32px;
  padding: 24px 18px;
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(34, 224, 214, 0.16), transparent 60%),
    var(--ink-800);
  border: 1px solid var(--line-600);
  -webkit-clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
}

.page-about .about-cta__kicker {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-size: clamp(19px, 3.6vw, 26px);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mute);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    padding: 28px 24px;
  }
}

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) 260px;
    align-items: start;
    gap: 32px;
  }

  .page-about .about-timeline {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px 64px;
    padding-left: 0;
  }

  .page-about .about-timeline::before {
    left: 50%;
    top: 0;
    bottom: 0;
    transform: translateX(-1px);
  }

  .page-about .about-tl__item::before {
    top: 30px;
  }

  .page-about .about-tl__item:nth-child(odd) {
    grid-column: 1;
  }

  .page-about .about-tl__item:nth-child(odd)::before {
    left: auto;
    right: -37px;
  }

  .page-about .about-tl__item:nth-child(even) {
    grid-column: 2;
  }

  .page-about .about-tl__item:nth-child(even)::before {
    left: -37px;
  }

  .page-about .about-tl__item:nth-child(odd)::after,
  .page-about .about-tl__item:nth-child(even)::after {
    content: "";
    position: absolute;
    top: 34px;
    width: 32px;
    height: 1px;
    background: var(--line-600);
  }

  .page-about .about-tl__item:nth-child(odd)::after {
    right: -32px;
  }

  .page-about .about-tl__item:nth-child(even)::after {
    left: -32px;
  }

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

@media (min-width: 1024px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 64px;
    align-items: start;
    padding-top: 56px;
    padding-bottom: 104px;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    margin-bottom: 0;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__link {
    padding: 10px 0 10px 14px;
    font-size: 14px;
    background: transparent;
    border: 0;
    border-left: 2px solid var(--line-600);
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    border-left-color: var(--cyan);
    background: linear-gradient(90deg, rgba(34, 224, 214, 0.1), transparent 70%);
  }

  .page-about .about-index__entry {
    display: block;
    margin-top: 26px;
    padding: 14px;
    background: var(--ink-900);
    border: 1px solid var(--line-600);
    -webkit-clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
    clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  }

  .page-about .about-index__entry-title {
    margin: 0 0 6px;
    font-size: 13px;
    font-weight: 700;
    color: var(--paper);
  }

  .page-about .about-index__entry-text {
    margin: 0 0 12px;
    font-size: 12px;
    line-height: 1.7;
    color: var(--mute);
  }

  .page-about .about-index__entry-btn {
    display: block;
    width: 100%;
    text-align: center;
    font-size: 13px;
  }

  .page-about .about-sec {
    margin-bottom: 88px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-plans {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) 300px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-chip,
  .page-about .about-role__blk,
  .page-about .about-plan,
  .page-about .about-index__link {
    transition: none;
  }

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