.page-about {
  --about-num: clamp(44px, 7.4vw, 108px);
  --about-card-shadow: 0 28px 56px -36px rgba(0, 0, 0, 0.85);
  background: var(--c-deep);
  color: var(--c-haze);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(18px, 2.6vw, 34px) 0 clamp(40px, 6vw, 84px);
  border-bottom: 1px solid var(--hair);
  background:
    radial-gradient(120% 90% at 88% -10%, rgba(33, 212, 224, 0.14) 0%, transparent 62%),
    linear-gradient(180deg, var(--c-deep) 0%, var(--c-trench) 180%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(90deg, rgba(216, 227, 232, 0.055) 1px, transparent 1px),
    linear-gradient(0deg, rgba(216, 227, 232, 0.055) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(110% 80% at 82% 0%, #000 0%, transparent 72%);
  mask-image: radial-gradient(110% 80% at 82% 0%, #000 0%, transparent 72%);
  pointer-events: none;
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 3.4vw, 44px);
  margin-top: clamp(22px, 3.2vw, 40px);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--c-cyan);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  max-width: 13em;
  font-size: clamp(34px, 5.6vw, 68px);
  line-height: 1.1;
  letter-spacing: -0.025em;
  font-weight: 900;
  color: var(--c-paper);
}

.page-about .about-hero__lede {
  margin: 0 0 26px;
  max-width: 46em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--c-haze);
}

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

.page-about .about-hero__side {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .about-hero__note {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-mist);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--hair);
  border: 1px solid var(--hair);
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 16px;
  background: rgba(3, 16, 28, 0.86);
}

.page-about .fact__key {
  font-size: 13px;
  color: var(--c-mist);
}

.page-about .fact__val {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--c-paper);
  font-variant-numeric: tabular-nums;
}

/* ---------- 主体骨架 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-about .about-rail {
  padding: clamp(22px, 3vw, 30px) 0 4px;
  border-bottom: 1px solid var(--hair);
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--c-mist);
  text-transform: uppercase;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 12px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  white-space: nowrap;
  font-size: 13px;
  color: var(--c-haze);
  text-decoration: none;
  border: 1px solid var(--hair);
  border-radius: 2px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--c-cyan);
  border-color: rgba(33, 212, 224, 0.55);
  background: rgba(33, 212, 224, 0.08);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-amber);
}

/* ---------- 章节 ---------- */
.page-about .chapter {
  padding: clamp(38px, 5.4vw, 72px) 0;
  border-bottom: 1px solid var(--hair);
}

.page-about .chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(12px, 2.4vw, 28px);
  align-items: start;
  margin-bottom: clamp(22px, 3.2vw, 38px);
}

.page-about .chapter__num {
  font-family: var(--font-mono);
  font-size: var(--about-num);
  line-height: 0.8;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--c-cyan);
}

@supports (-webkit-text-stroke: 1px #000) {
  .page-about .chapter__num {
    color: transparent;
    -webkit-text-stroke: 1px rgba(33, 212, 224, 0.65);
  }
}

.page-about .chapter__kicker {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--c-mist);
}

.page-about .chapter__title {
  margin: 0;
  font-size: clamp(23px, 3.2vw, 38px);
  line-height: 1.24;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--c-paper);
}

.page-about .chapter__lede,
.page-about .lead-text {
  margin: 0 0 16px;
  max-width: 62em;
  font-size: clamp(15px, 1.55vw, 17px);
  line-height: 1.78;
  color: var(--c-haze);
}

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

.page-about .inline-link {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(33, 212, 224, 0.45);
}

.page-about .inline-link:hover,
.page-about .inline-link:focus-visible {
  border-bottom-color: var(--c-cyan);
  background: rgba(33, 212, 224, 0.1);
}

/* ---------- 01 分栏与叠层图 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(22px, 3.2vw, 40px);
  align-items: start;
}

.page-about .tag-row {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .tag-row .tag {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  font-size: 13px;
  border-radius: 2px;
  border: 1px solid var(--hair-strong);
  color: var(--c-haze);
  background: rgba(216, 227, 232, 0.06);
}

.page-about .tag-row .tag--score {
  border-color: rgba(255, 176, 46, 0.55);
  color: var(--c-amber);
  background: rgba(255, 176, 46, 0.1);
}

.page-about .tag-row .tag--cyan {
  border-color: rgba(33, 212, 224, 0.55);
  color: var(--c-cyan);
  background: rgba(33, 212, 224, 0.1);
}

.page-about .tag-row .tag--live {
  border-color: rgba(87, 242, 161, 0.5);
  color: var(--c-lime);
  background: rgba(87, 242, 161, 0.1);
}

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

.page-about .about-figure img {
  position: relative;
  z-index: 1;
  width: 100%;
  border: 1px solid var(--hair-strong);
  border-radius: 2px;
  filter: saturate(0.82) contrast(1.03);
}

.page-about .about-figure figcaption {
  position: relative;
  z-index: 1;
  margin-top: 12px;
  padding-left: 12px;
  border-left: 1px solid var(--hair-strong);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--c-mist);
}

/* ---------- 02 两条内容线 ---------- */
.page-about .lanes-svg {
  display: block;
  width: 100%;
  height: auto;
  margin: 4px 0 clamp(18px, 2.6vw, 28px);
}

.page-about .lanes-svg .ln-foot,
.page-about .lanes-svg .ln-bask {
  fill: none;
  stroke-width: 2;
}

.page-about .lanes-svg .ln-foot {
  stroke: var(--c-cyan);
}

.page-about .lanes-svg .ln-bask {
  stroke: var(--c-amber);
  stroke-dasharray: 7 7;
}

.page-about .lanes-svg .nd {
  fill: var(--c-deep);
  stroke: var(--c-cyan);
  stroke-width: 2;
}

.page-about .lanes-svg .nd--amber {
  stroke: var(--c-amber);
}

.page-about .lanes-svg .nd--join {
  fill: var(--c-cyan);
  stroke: var(--c-paper);
}

.page-about .lanes {
  display: grid;
  gap: clamp(18px, 2.6vw, 30px);
}

.page-about .lane {
  padding-top: 18px;
  border-top: 3px solid var(--c-cyan);
}

.page-about .lane--bask {
  border-top-color: var(--c-amber);
}

.page-about .lane__tag {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-cyan);
}

.page-about .lane--bask .lane__tag {
  color: var(--c-amber);
}

.page-about .lane__title {
  margin: 0 0 12px;
  font-size: 19px;
  line-height: 1.4;
  color: var(--c-paper);
}

.page-about .lane__list {
  margin: 0;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--c-haze);
}

.page-about .lane__list li + li {
  margin-top: 8px;
}

.page-about .roles {
  margin-top: clamp(24px, 3.4vw, 40px);
  display: grid;
  gap: 1px;
  background: var(--hair);
  border: 1px solid var(--hair);
}

.page-about .role {
  padding: 18px 18px 22px;
  background: var(--c-trench);
}

.page-about .role__name {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 8px;
  font-size: 15px;
  color: var(--c-paper);
}

.page-about .role__name::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--c-cyan);
  flex: none;
}

.page-about .role:nth-child(2) .role__name::before {
  background: var(--c-amber);
}

.page-about .role:nth-child(3) .role__name::before {
  background: var(--c-lime);
}

.page-about .role:nth-child(4) .role__name::before {
  background: var(--c-haze);
}

.page-about .role p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-haze);
}

/* ---------- 03 复核流程 ---------- */
.page-about .flow {
  list-style: none;
  margin: 4px 0 clamp(26px, 3.4vw, 38px);
  padding: 0;
  display: grid;
  gap: 12px;
  counter-reset: flow;
}

.page-about .flow__step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 18px 20px;
  border-left: 3px solid var(--c-cyan);
  background: linear-gradient(90deg, rgba(33, 212, 224, 0.13) 0%, rgba(33, 212, 224, 0) 68%);
}

.page-about .flow__step:nth-child(2) {
  border-left-color: var(--c-teal);
  background: linear-gradient(90deg, rgba(10, 124, 138, 0.22) 0%, rgba(10, 124, 138, 0) 68%);
}

.page-about .flow__step:nth-child(3) {
  border-left-color: var(--c-lime);
  background: linear-gradient(90deg, rgba(87, 242, 161, 0.13) 0%, rgba(87, 242, 161, 0) 68%);
}

.page-about .flow__num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-amber);
  font-variant-numeric: tabular-nums;
}

.page-about .flow__step h3 {
  margin: 0 0 6px;
  font-size: 17px;
  color: var(--c-paper);
}

.page-about .flow__step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--c-haze);
}

/* ---------- 04 规模数字 ---------- */
.page-about .stats {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--hair);
  border: 1px solid var(--hair);
}

.page-about .stat {
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--c-trench);
}

.page-about .stat__value {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.page-about .stat__num {
  font-size: clamp(36px, 5vw, 54px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.035em;
  color: var(--c-paper);
}

.page-about .stat__unit {
  font-size: 15px;
  color: var(--c-mist);
}

.page-about .stat__desc {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-haze);
}

/* ---------- 05 合作生态 ---------- */
.page-about .coop {
  display: grid;
  gap: 14px;
  margin: 4px 0 clamp(26px, 3.4vw, 40px);
}

.page-about .coop__item {
  position: relative;
  padding: 24px 20px 20px;
  border: 1px solid var(--hair-strong);
  background: rgba(8, 37, 58, 0.6);
}

.page-about .coop__item::after {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 52px;
  height: 2px;
  background: var(--c-cyan);
}

.page-about .coop__item:nth-child(2)::after {
  background: var(--c-amber);
}

.page-about .coop__item:nth-child(3)::after {
  background: var(--c-lime);
}

.page-about .coop__name {
  margin: 0 0 10px;
  font-size: 17px;
  line-height: 1.4;
  color: var(--c-paper);
}

.page-about .coop__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--c-haze);
}

.page-about .coop__fit {
  margin-top: 14px !important;
  padding-top: 12px;
  border-top: 1px dashed var(--hair-strong);
  font-size: 12.5px !important;
  color: var(--c-cyan) !important;
}

/* ---------- 06 终端 ---------- */
.page-about .devices {
  list-style: none;
  margin: 4px 0 clamp(20px, 3vw, 30px);
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .device {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 16px 18px;
  border: 1px solid var(--hair);
  background: rgba(8, 37, 58, 0.38);
}

.page-about .device__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--c-cyan);
  padding-top: 4px;
}

.page-about .device h3 {
  margin: 0 0 4px;
  font-size: 15px;
  color: var(--c-paper);
}

.page-about .device p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-haze);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(36px, 5vw, 72px);
  padding: clamp(32px, 5vw, 64px) 0;
  background:
    radial-gradient(90% 120% at 10% 0%, rgba(33, 212, 224, 0.14) 0%, transparent 65%),
    var(--c-trench);
  border-top: 1px solid var(--hair);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 24px;
}

.page-about .about-cta h2 {
  margin: 0 0 10px;
  font-size: clamp(23px, 3vw, 34px);
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--c-paper);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 58em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--c-haze);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

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

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

@media (min-width: 768px) {
  .page-about .lanes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .coop__item {
    padding: 26px 22px 22px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .about-hero__side {
    grid-template-columns: auto minmax(0, 1fr);
    gap: 20px;
    align-items: start;
    justify-self: end;
    width: 100%;
    max-width: 340px;
  }

  .page-about .about-hero__note {
    writing-mode: vertical-rl;
    letter-spacing: 0.3em;
    padding-top: 4px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  }

  .page-about .about-figure--stack::before {
    content: "";
    position: absolute;
    inset: 16px -10px -16px 12px;
    background: var(--c-paper);
    border: 1px solid var(--ink-hair);
    border-radius: 2px;
    z-index: 0;
    box-shadow: var(--about-card-shadow);
  }

  .page-about .coop {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
    background: var(--hair);
    border: 1px solid var(--hair);
  }

  .page-about .coop__item {
    border: 0;
    background: rgba(8, 37, 58, 0.85);
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.3fr) auto;
    align-items: center;
  }
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: 168px minmax(0, 1fr);
    column-gap: clamp(28px, 4vw, 64px);
  }

  .page-about .about-rail {
    padding-top: clamp(46px, 5vw, 70px);
    border-bottom: 0;
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: 104px;
  }

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

  .page-about .about-rail__link {
    display: flex;
    width: 100%;
    padding: 10px 10px 10px 12px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: transparent;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-left-color: var(--c-cyan);
    background: rgba(33, 212, 224, 0.07);
  }

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

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

@media (min-width: 1200px) {
  .page-about .about-hero__title {
    font-size: clamp(56px, 4.8vw, 72px);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .inline-link {
    transition: none;
  }
}
<<<END>>>