.page-about {
  background: var(--ink);
  color: var(--mist);
  overflow-x: hidden;
  padding-bottom: 88px;
}

/* ============ 卷首 ============ */
.page-about .about-mast {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: calc(var(--band-h) + 60px) 0 56px;
  border-bottom: 2px solid var(--line);
  background:
    radial-gradient(900px 420px at 84% -12%, rgba(127, 182, 217, 0.26), transparent 62%),
    radial-gradient(680px 360px at 4% 112%, rgba(227, 102, 42, 0.16), transparent 60%),
    linear-gradient(180deg, var(--ink) 0%, var(--deep) 100%);
}

.page-about .about-mast__glow {
  position: absolute;
  inset: auto -10% -40% 40%;
  height: 320px;
  background: radial-gradient(closest-side, rgba(127, 182, 217, 0.22), transparent 72%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-mast__trace {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 6px;
  width: 100%;
  height: 120px;
  opacity: 0.7;
  pointer-events: none;
  z-index: 0;
}

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

.page-about .about-mast .breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--mist-50);
  margin-bottom: 30px;
}

.page-about .about-mast .breadcrumb a {
  color: var(--mist-70);
}

.page-about .about-mast__title {
  margin: 14px 0 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 6vw, 4.2rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--mist);
  text-wrap: balance;
}

.page-about .about-mast__lede {
  margin: 26px 0 0;
  max-width: 62ch;
  font-size: clamp(1rem, 1.3vw, 1.08rem);
  line-height: 1.8;
  color: var(--mist-70);
}

.page-about .about-mast__facts {
  list-style: none;
  margin: 40px 0 0;
  padding: 2px;
  display: grid;
  gap: 2px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  background: var(--line);
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
}

.page-about .about-mast__facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: rgba(10, 17, 24, 0.76);
}

.page-about .fact__k {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--glint);
  text-transform: uppercase;
}

.page-about .fact__v {
  font-size: 1rem;
  font-weight: 600;
  color: var(--mist);
}

.page-about .about-mast__jump {
  margin-top: 38px;
  padding-top: 22px;
  border-top: 2px dashed var(--line-strong);
}

.page-about .about-mast__jump-label {
  display: block;
  color: var(--stone);
}

.page-about .about-mast__jump-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
}

.page-about .about-mast__jump-list a {
  font-size: 0.92rem;
  color: var(--mist-70);
}

/* ============ 主体堆叠面板 ============ */
.page-about .about-body {
  position: relative;
  padding-top: 64px;
}

.page-about .about-sec {
  position: relative;
  padding-bottom: 52px;
  margin-bottom: 56px;
  border-bottom: 2px solid var(--line);
}

.page-about .about-sec:last-of-type {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-sec__head {
  margin-bottom: 30px;
}

.page-about .about-sec__no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 46px;
  height: 30px;
  padding: 0 10px;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--ink);
  background: var(--orange);
  border: 2px solid var(--ink);
  text-decoration: none;
  transition: background 200ms ease, transform 200ms ease;
}

.page-about .about-sec__no:hover,
.page-about .about-sec__no:focus-visible {
  background: var(--yellow);
  transform: translateX(4px);
  text-decoration: none;
}

.page-about .about-sec__title {
  margin: 16px 0 0;
  max-width: 28ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.4vw, 2rem);
  line-height: 1.22;
  letter-spacing: -0.015em;
  color: var(--mist);
}

.page-about .about-sec__lede {
  margin: 16px 0 0;
  max-width: 60ch;
  font-size: 0.98rem;
  line-height: 1.78;
  color: var(--mist-50);
}

.page-about .about-split {
  display: grid;
  gap: 30px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-split__body p {
  margin: 0 0 18px;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--mist-70);
}

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

.page-about .about-split__media {
  display: grid;
  gap: 18px;
  align-content: start;
}

/* ============ 标签条 ============ */
.page-about .about-chips {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-chips .tag {
  padding: 7px 14px;
  border-width: 2px;
  font-size: 0.78rem;
  color: var(--misT, var(--mist));
}

/* ============ 团队四格 ============ */
.page-about .team {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .team__item {
  position: relative;
  padding: 26px 22px 22px;
  background: var(--deep-2);
  border: 2px solid var(--line-strong);
  box-shadow: var(--shadow-hard);
  transition: transform 200ms ease, box-shadow 200ms ease, border-color 200ms ease;
}

.page-about .team__item:hover,
.page-about .team__item:focus-within {
  transform: translateY(-4px);
  border-color: var(--orange);
  box-shadow: var(--shadow-hard-lg);
}

.page-about .team__item--lead {
  border-width: 3px;
  border-color: var(--orange);
  background: linear-gradient(180deg, var(--deep-2) 0%, #10364d 100%);
}

.page-about .team__no {
  display: inline-block;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--yellow);
}

.page-about .team__name {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--mist);
}

.page-about .team__text {
  margin: 10px 0 0;
  font-size: 0.94rem;
  line-height: 1.76;
  color: var(--mist-70);
}

/* ============ 版本演进线 ============ */
.page-about .timeline {
  list-style: none;
  margin: 0 0 34px;
  padding: 0;
  display: grid;
  gap: 26px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .ver {
  position: relative;
  padding: 2px 0 0 34px;
}

.page-about .ver::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: -26px;
  left: 7px;
  width: 2px;
  background: repeating-linear-gradient(180deg, var(--line-strong) 0 8px, transparent 8px 16px);
}

.page-about .ver:last-child::before {
  bottom: 0;
  background: none;
}

.page-about .ver__dot {
  position: absolute;
  top: 2px;
  left: 0;
  width: 16px;
  height: 16px;
  background: var(--ink);
  border: 3px solid var(--orange);
  transform: rotate(45deg);
  transition: background 200ms ease, border-color 200ms ease, box-shadow 200ms ease;
}

.page-about .ver:hover .ver__dot,
.page-about .ver:focus-within .ver__dot {
  background: var(--yellow);
  border-color: var(--yellow);
  box-shadow: 0 0 0 5px rgba(240, 180, 41, 0.16);
}

.page-about .ver__no {
  margin: 0;
  font-size: 0.86rem;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .ver:hover .ver__no {
  color: var(--yellow);
}

.page-about .ver__name {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.06rem;
  color: var(--mist);
}

.page-about .ver__time {
  margin: 6px 0 0;
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--stone);
}

.page-about .ver__text {
  margin: 10px 0 0;
  font-size: 0.92rem;
  line-height: 1.74;
  color: var(--mist-50);
}

.page-about .archive-band {
  position: relative;
  margin: 0;
  border: 2px solid var(--clay);
  box-shadow: var(--shadow-hard);
  background: var(--cream);
}

.page-about .archive-band img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  filter: saturate(0.62) contrast(1.04);
}

.page-about .archive-band .figure__caption {
  position: static;
  display: block;
  padding: 12px 16px;
  border-top: 2px solid var(--clay);
  background: var(--cream);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: #4a3a30;
}

/* ============ 首次访问三步 ============ */
.page-about .steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: none;
  display: grid;
  gap: 20px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .step {
  position: relative;
  padding: 24px 22px;
  background: rgba(16, 46, 69, 0.55);
  border: 2px solid var(--line-strong);
  border-left: 6px solid var(--glint);
  transition: border-color 200ms ease, background 200ms ease;
}

.page-about .step:hover {
  border-left-color: var(--orange);
  background: rgba(20, 56, 79, 0.72);
}

.page-about .step__no {
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--glint);
  text-transform: uppercase;
}

.page-about .step__name {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.16rem;
  color: var(--mist);
}

.page-about .step p {
  margin: 10px 0 14px;
  font-size: 0.94rem;
  line-height: 1.76;
  color: var(--mist-70);
}

.page-about .step .link {
  font-size: 0.88rem;
}

/* ============ 覆盖地市点阵 ============ */
.page-about .cities {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .city {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  font-size: 0.9rem;
  color: var(--mist-70);
  background: rgba(10, 17, 24, 0.55);
  border: 2px solid var(--line);
  transition: border-color 200ms ease, color 200ms ease;
}

.page-about .city:hover {
  border-color: var(--orange);
  color: var(--mist);
}

.page-about .city__dot {
  flex: none;
  width: 8px;
  height: 8px;
  background: var(--glint);
  transform: rotate(45deg);
}

.page-about .city:first-child .city__dot {
  background: var(--orange);
}

.page-about .about-note {
  margin: 0;
  padding: 18px 20px;
  font-size: 0.9rem;
  line-height: 1.76;
  color: var(--mist-70);
  background: rgba(92, 115, 97, 0.24);
  border: 2px solid var(--moss);
}

/* ============ 合作生态 ============ */
.page-about .partner-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .partner {
  padding: 24px 22px;
  background: var(--deep);
  border: 2px solid var(--line-strong);
  box-shadow: var(--shadow-hard);
  transition: border-color 200ms ease, box-shadow 200ms ease;
}

.page-about .partner:hover {
  border-color: var(--yellow);
  box-shadow: var(--shadow-hard-lg);
}

.page-about .partner .tag {
  display: inline-block;
}

.page-about .partner__name {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.14rem;
  color: var(--mist);
}

.page-about .partner p {
  margin: 10px 0 0;
  font-size: 0.94rem;
  line-height: 1.76;
  color: var(--mist-70);
}

.page-about .about-cta {
  margin-top: 30px;
  padding: 28px 24px;
  background:
    radial-gradient(560px 260px at 90% 0%, rgba(127, 182, 217, 0.2), transparent 66%),
    var(--ink);
  border: 2px solid var(--orange);
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--mist-70);
}

.page-about .about-cta__actions {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ============ 平板及以上 ============ */
@media (min-width: 700px) {
  .page-about .about-mast__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

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

  .page-about .about-split--flip .about-split__media {
    order: -1;
  }
}

/* ============ 桌面 ============ */
@media (min-width: 960px) {
  .page-about .about-mast {
    padding: calc(var(--band-h) + 84px) 0 72px;
  }

  .page-about .about-body {
    padding-top: 88px;
  }

  .page-about .about-sec {
    padding-left: 34px;
    padding-bottom: 64px;
    margin-bottom: 72px;
    border-left: 4px solid var(--line);
    transition: border-left-color 200ms ease;
  }

  .page-about .about-sec:hover {
    border-left-color: var(--orange);
  }

  .page-about .about-sec__head {
    margin-bottom: 38px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-split--flip {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
  }

  .page-about .about-split__media {
    margin-top: 6px;
  }

  .page-about .team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .timeline {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: var(--gap);
    margin-bottom: 44px;
  }

  .page-about .ver {
    padding: 42px 0 0;
  }

  .page-about .ver::before {
    top: 12px;
    bottom: auto;
    left: 0;
    right: calc(var(--gap) * -1);
    width: auto;
    height: 2px;
    background: repeating-linear-gradient(90deg, var(--line-strong) 0 8px, transparent 8px 16px);
  }

  .page-about .ver:last-child::before {
    right: 0;
  }

  .page-about .ver__dot {
    top: 5px;
    left: 0;
  }

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

  .page-about .about-cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
    padding: 34px 32px;
  }

  .page-about .about-cta__actions {
    margin-top: 0;
    flex: none;
  }
}

@media (min-width: 1200px) {
  .page-about .about-mast__title {
    max-width: 24ch;
  }
}

/* 无脚本时保证内容完整可见 */
.page-about [data-reveal] {
  opacity: 1;
}
<<<END>>>

.page-about {
  --misT: currentColor;
}