.page-about {
  --about-flow: clamp(3.25rem, 8vw, 6.25rem);
  --about-cut: 20px;
  --about-gutter: clamp(1rem, 4vw, 3rem);
  color: var(--bone);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(1.25rem, 3.5vw, 2.5rem) 0 clamp(2.5rem, 6vw, 4.5rem);
  border-bottom: 1px solid var(--rock-line);
}

.page-about .about-hero::before,
.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  pointer-events: none;
}

.page-about .about-hero::before {
  inset: -30% -15% 10% 25%;
  background:
    radial-gradient(58% 58% at 72% 18%, rgba(123, 44, 255, 0.30), transparent 72%),
    radial-gradient(52% 52% at 88% 62%, rgba(10, 92, 255, 0.32), transparent 74%);
}

.page-about .about-hero::after {
  inset: 0;
  background-image:
    linear-gradient(to right, var(--rock-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--rock-line) 1px, transparent 1px);
  background-size: 76px 76px;
  opacity: 0.16;
  -webkit-mask-image: linear-gradient(to bottom, #000 10%, transparent 88%);
  mask-image: linear-gradient(to bottom, #000 10%, transparent 88%);
}

.page-about .breadcrumb {
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-hero__eyebrow {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 0 1.1rem;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.9rem, 5vw, 3.6rem);
  line-height: 1.14;
  letter-spacing: 0.01em;
  color: var(--bone);
  max-width: 22ch;
  margin: 0;
}

.page-about .about-hero__lede {
  max-width: 63ch;
  margin: 1.35rem 0 0;
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(2rem, 5vw, 3rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--rock-line);
  border: 1px solid var(--rock-line);
}

.page-about .about-hero__facts .stat {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 1.1rem 1.15rem;
  background: var(--slate-deep);
}

.page-about .about-hero__facts .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  letter-spacing: 0.02em;
  color: var(--bone);
  line-height: 1;
}

.page-about .about-hero__facts .stat__key {
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--mist);
}

/* ============ 章节骨架 ============ */
.page-about .chapter {
  position: relative;
  padding: var(--about-flow) 0;
  border-bottom: 1px solid var(--rock-line);
}

.page-about .chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 0.75rem 1rem;
}

.page-about .chapter__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.6rem;
  padding: 0.35rem 0.6rem;
  background: linear-gradient(135deg, rgba(10, 92, 255, 0.95), rgba(123, 44, 255, 0.8));
  color: var(--bone);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  border-radius: var(--radius);
}

.page-about .chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.35rem, 3vw, 2.1rem);
  line-height: 1.25;
  letter-spacing: 0.01em;
  color: var(--bone);
}

.page-about .chapter__state {
  justify-self: start;
}

.page-about .chapter__lede {
  max-width: 64ch;
  margin: 1.3rem 0 0;
  color: var(--mist);
  line-height: 1.78;
}

.page-about .media-frame {
  margin: 0;
}

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

.page-about .media-frame__caption {
  margin-top: 0.75rem;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--mist);
}

/* ============ 01 版本时间线 ============ */
.page-about .about-timeline__figure {
  margin-top: 2.25rem;
}

.page-about .tl {
  list-style: none;
  margin: clamp(2rem, 5vw, 3rem) 0 0;
  padding: 0 0 0.75rem;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(0, 1fr);
  gap: 0;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .tl__item {
  position: relative;
  padding: 3.1rem 1.5rem 0 0;
  scroll-snap-align: start;
  outline: none;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  top: 2.5rem;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--rock-line);
}

.page-about .tl__item::after {
  content: "";
  position: absolute;
  top: 2.5rem;
  left: 0;
  width: 9px;
  height: 9px;
  margin-top: -5px;
  background: var(--cyan);
  transform: rotate(45deg);
}

.page-about .tl__item--current::after {
  background: var(--amber);
  box-shadow: 0 0 0 5px rgba(255, 159, 28, 0.16);
}

.page-about .tl__ver {
  position: absolute;
  top: 0;
  left: 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .tl__ver--current {
  color: var(--amber);
}

.page-about .tl__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1.4;
  color: var(--bone);
}

.page-about .tl__text {
  margin: 0.5rem 0 0;
  font-size: 0.9rem;
  line-height: 1.66;
  color: var(--mist);
}

.page-about .tl__more {
  margin: 0;
  padding-left: 0.75rem;
  border-left: 2px solid var(--cyan);
  font-size: 0.875rem;
  line-height: 1.62;
  color: var(--bone);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.28s var(--ease), opacity 0.2s var(--ease), margin-top 0.28s var(--ease);
}

.page-about .tl__item:hover .tl__more,
.page-about .tl__item:focus .tl__more,
.page-about .tl__item:focus-within .tl__more {
  max-height: 10rem;
  opacity: 1;
  margin-top: 0.85rem;
}

.page-about .tl__item:hover::after,
.page-about .tl__item:focus::after {
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(0, 229, 208, 0.16);
}

/* ============ 02 服务对象 ============ */
.page-about .who {
  list-style: none;
  margin: clamp(2rem, 5vw, 2.75rem) 0 0;
  padding: 0;
}

.page-about .who__item {
  display: grid;
  grid-template-columns: 2.5rem minmax(0, 1fr);
  gap: 0.4rem 1rem;
  padding: 1.6rem 0;
  border-top: 1px solid var(--rock-line);
}

.page-about .who__item:last-child {
  border-bottom: 1px solid var(--rock-line);
}

.page-about .who__num {
  grid-column: 1;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
  padding-top: 0.3rem;
}

.page-about .who__name {
  grid-column: 2;
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--bone);
}

.page-about .who__desc {
  grid-column: 2;
}

.page-about .who__desc p {
  margin: 0 0 0.75rem;
  max-width: 62ch;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: var(--mist);
}

/* ============ 03 团队 ============ */
.page-about .about-team__grid {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}

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

.page-about .about-team__main .lede {
  margin: 0;
  max-width: 60ch;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .bars {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.4rem;
}

.page-about .bar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.45rem 0.75rem;
  position: relative;
  outline: none;
}

.page-about .bar__label {
  grid-column: 1;
  font-size: 0.9375rem;
  line-height: 1.4;
  color: var(--bone);
}

.page-about .bar__num {
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .bar__track {
  grid-column: 1 / -1;
  display: block;
  height: 6px;
  background: var(--rock-line);
  overflow: hidden;
}

.page-about .bar__fill {
  display: block;
  height: 100%;
  transition: filter 0.18s var(--ease);
}

.page-about .bar:nth-child(1) .bar__fill { width: 33.3%; background: var(--blue); }
.page-about .bar:nth-child(2) .bar__fill { width: 26.2%; background: var(--violet); }
.page-about .bar:nth-child(3) .bar__fill { width: 31%;   background: var(--cyan); }
.page-about .bar:nth-child(4) .bar__fill { width: 9.5%;  background: var(--moss); }

.page-about .bar__tip {
  grid-column: 1 / -1;
  font-size: 0.85rem;
  line-height: 1.62;
  color: var(--mist);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.26s var(--ease), opacity 0.2s var(--ease);
}

.page-about .bar:hover .bar__tip,
.page-about .bar:focus .bar__tip {
  max-height: 6rem;
  opacity: 1;
}

.page-about .bar:hover .bar__fill,
.page-about .bar:focus .bar__fill {
  filter: brightness(1.25);
}

.page-about .about-team__note {
  margin: 2rem 0 0;
  max-width: 60ch;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-team__figure {
  margin-top: 2rem;
}

/* ============ 04 校核流程 ============ */
.page-about .qa-flow {
  display: grid;
  gap: 1rem;
  margin-top: 2.25rem;
}

.page-about .qa-flow__step {
  position: relative;
  padding: 1.75rem 1.5rem 1.5rem;
  background: var(--slate-panel);
  border: 1px solid var(--rock-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .qa-flow__step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 46px;
  height: 3px;
  background: var(--cyan);
}

.page-about .qa-flow__step--1::before { background: var(--blue); }
.page-about .qa-flow__step--2::before { background: var(--cyan); }
.page-about .qa-flow__step--3::before { background: var(--moss); }

.page-about .qa-flow__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .qa-flow__title {
  margin: 0.6rem 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--bone);
}

.page-about .qa-flow__text {
  margin: 0.65rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-qa__figure {
  margin-top: 2.25rem;
}

/* ============ 05 资质 ============ */
.page-about .cred {
  list-style: none;
  margin: clamp(2rem, 5vw, 2.75rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--rock-line);
  border: 1px solid var(--rock-line);
}

.page-about .cred__item {
  display: grid;
  grid-template-columns: 2.5rem minmax(0, 1fr);
  gap: 0.35rem 1rem;
  padding: 1.4rem 1.35rem;
  background: var(--slate-deep);
}

.page-about .cred__idx {
  grid-column: 1;
  grid-row: 1;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
  padding-top: 0.28rem;
}

.page-about .cred__title {
  grid-column: 2;
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--bone);
}

.page-about .cred__desc {
  grid-column: 2;
  margin: 0;
  max-width: 60ch;
  font-size: 0.9rem;
  line-height: 1.68;
  color: var(--mist);
}

/* ============ 06 合作生态 ============ */
.page-about .about-partner__grid {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}

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

.page-about .about-partner__text p {
  margin: 0 0 1rem;
  max-width: 62ch;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-partner__action {
  margin: 1.6rem 0 0;
}

.page-about .about-partner__stats {
  display: grid;
  gap: 1px;
  margin-top: 2rem;
  background: var(--rock-line);
  border: 1px solid var(--rock-line);
}

.page-about .about-partner__stats .stat {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 1.35rem 1.4rem;
  background: var(--slate-deep);
}

.page-about .about-partner__stats .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--bone);
}

.page-about .about-partner__stats .stat__key {
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--mist);
}

/* ============ 收口导航 ============ */
.page-about .about-next {
  padding: var(--about-flow) 0;
  border-bottom: 1px solid var(--rock-line);
}

.page-about .about-next__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.15rem, 2.2vw, 1.5rem);
  color: var(--bone);
}

.page-about .about-next__grid {
  margin-top: 1.75rem;
  display: grid;
  gap: 1px;
  background: var(--rock-line);
  border: 1px solid var(--rock-line);
}

.page-about .about-next__link {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.35rem 1.25rem;
  background: var(--slate-deep);
  color: var(--bone);
  text-decoration: none;
  transition: background 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: var(--slate-panel);
  box-shadow: inset 0 0 0 1px var(--cyan);
}

.page-about .about-next__idx {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-next__label {
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-next__link:hover .about-next__label,
.page-about .about-next__link:focus-visible .about-next__label {
  color: var(--bone);
}

/* ============ 响应式 ============ */
@media (max-width: 719px) {
  .page-about .tl {
    grid-auto-columns: minmax(230px, 78vw);
  }

  .page-about .about-hero::after {
    background-size: 56px 56px;
  }
}

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

  .page-about .cred__item {
    grid-template-columns: 2.5rem 15rem minmax(0, 1fr);
    align-items: baseline;
  }

  .page-about .cred__title {
    grid-column: 2;
  }

  .page-about .cred__desc {
    grid-column: 3;
  }

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

  .page-about .about-partner__stats {
    margin-top: 0;
  }
}

@media (min-width: 900px) {
  .page-about .who__item {
    grid-template-columns: 3rem minmax(0, 17rem) minmax(0, 1fr);
    align-items: start;
    gap: 0.4rem 1.5rem;
  }

  .page-about .who__desc {
    grid-column: 3;
  }

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

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

@media (min-width: 1024px) {
  .page-about .about-team__figure {
    margin-top: 0;
  }

  .page-about .about-partner__stats {
    align-content: start;
  }
}
<<<END>>>