.page-about {
  --about-hair: rgba(155, 176, 211, 0.16);
  --about-hair-strong: rgba(155, 176, 211, 0.3);
  --about-panel: rgba(27, 49, 89, 0.42);
  --about-panel-deep: rgba(16, 31, 60, 0.72);
  --about-shadow: 0 24px 52px rgba(3, 8, 18, 0.48);
  --about-gap: 22px;
}

.page-about .about-h2 {
  margin: 12px 0 0;
  font-size: clamp(25px, 5.6vw, 44px);
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--nt-mist);
}

.page-about .about-lead-note {
  margin-top: 18px;
  max-width: 34ch;
}

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

.page-about .about-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--nt-r-md);
  border: 1px solid var(--about-hair);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 24px 0 16px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -120px;
  right: -18%;
  width: min(620px, 72vw);
  height: min(620px, 72vw);
  background: radial-gradient(circle at 35% 35%, rgba(79, 209, 197, 0.16), transparent 62%);
  pointer-events: none;
  z-index: 0;
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: 34px;
  margin-top: 30px;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(30px, 7.8vw, 58px);
  line-height: 1.1;
  letter-spacing: -0.022em;
  color: var(--nt-mist);
}

.page-about .about-hero__lede {
  margin-top: 20px;
  max-width: 58ch;
  color: var(--nt-silver);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__board {
  position: relative;
  padding: 30px 24px 26px 34px;
  background: linear-gradient(152deg, rgba(27, 49, 89, 0.9), rgba(10, 20, 40, 0.86));
  border: 1px solid var(--about-hair);
  border-radius: var(--nt-r-organic);
  box-shadow: var(--about-shadow);
}

.page-about .about-hero__board::before {
  content: "";
  position: absolute;
  left: 0;
  top: 34px;
  bottom: 34px;
  width: 3px;
  border-radius: 0 4px 4px 0;
  background: linear-gradient(180deg, var(--nt-cyan), var(--nt-orange));
}

.page-about .about-hero__vert {
  position: absolute;
  top: 18px;
  right: 12px;
  color: var(--nt-silver);
  font-family: var(--nt-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  opacity: 0.7;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-facts__val {
  display: block;
  font-family: var(--nt-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--nt-mist);
}

.page-about .about-facts__item--gold .about-facts__val {
  color: var(--nt-gold);
}

.page-about .about-facts__key {
  display: block;
  margin-top: 9px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--nt-silver);
}

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 34px;
  padding-top: 22px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-jump__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  font-size: 14px;
  color: var(--nt-silver);
  text-decoration: none;
  border: 1px solid var(--about-hair);
  border-radius: 999px;
  transition: color var(--nt-ease) 200ms, border-color var(--nt-ease) 200ms,
    background-color var(--nt-ease) 200ms;
}

.page-about .about-jump__link:hover,
.page-about .about-jump__link:focus-visible {
  color: var(--nt-mist);
  border-color: rgba(255, 107, 53, 0.6);
  background-color: rgba(255, 107, 53, 0.1);
}

.page-about .about-jump__idx {
  font-family: var(--nt-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--nt-cyan);
}

/* ---------- 分屏骨架 ---------- */
.page-about .about-split {
  display: grid;
  gap: 38px;
}

.page-about .about-prose {
  margin-top: 20px;
  color: var(--nt-silver);
}

.page-about .about-prose p {
  margin: 0 0 16px;
}

/* ---------- 团队分工 ---------- */
.page-about .about-team {
  padding-top: 56px;
}

.page-about .about-roles {
  display: grid;
  gap: 14px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-role {
  position: relative;
  padding: 20px 20px 20px 26px;
  background: var(--about-panel);
  border: 1px solid var(--about-hair);
  border-radius: var(--nt-r-md);
  transition: transform var(--nt-ease) 240ms, border-color var(--nt-ease) 240ms,
    background-color var(--nt-ease) 240ms;
}

.page-about .about-role::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  bottom: 20px;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: var(--nt-cyan);
  opacity: 0.55;
  transition: opacity var(--nt-ease) 240ms, background-color var(--nt-ease) 240ms;
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  transform: translateY(-3px);
  border-color: rgba(79, 209, 197, 0.5);
  background-color: rgba(27, 49, 89, 0.66);
}

.page-about .about-role:hover::before {
  opacity: 1;
  background: var(--nt-orange);
}

.page-about .about-role__idx {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--nt-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--nt-cyan);
}

.page-about .about-role__name {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--nt-mist);
}

.page-about .about-role__text {
  margin: 9px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--nt-silver);
}

/* ---------- 维护流程 ---------- */
.page-about .about-flow {
  position: relative;
  padding: 64px 0;
  background: linear-gradient(180deg, rgba(16, 31, 60, 0.86), rgba(10, 20, 40, 0.28));
  border-top: 1px solid var(--about-hair);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-flow__head {
  max-width: 62ch;
}

.page-about .about-flow__grid {
  display: grid;
  gap: 30px;
  margin-top: 34px;
}

.page-about .about-flow__figure {
  max-width: 420px;
}

.page-about .about-steps {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 18px;
  background: rgba(10, 20, 40, 0.52);
  border: 1px solid var(--about-hair);
  border-radius: var(--nt-r-md);
  transition: border-color var(--nt-ease) 220ms, background-color var(--nt-ease) 220ms;
}

.page-about .about-step:hover {
  border-color: rgba(79, 209, 197, 0.44);
  background-color: rgba(27, 49, 89, 0.5);
}

.page-about .about-step--gate {
  border-left: 3px solid var(--nt-orange);
}

.page-about .about-step__idx {
  font-family: var(--nt-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--nt-cyan);
  padding-top: 2px;
}

.page-about .about-step--gate .about-step__idx {
  color: var(--nt-orange);
}

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

.page-about .about-step__text {
  margin: 7px 0 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--nt-silver);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence {
  padding-top: 62px;
}

.page-about .about-cadence__head {
  max-width: 64ch;
}

.page-about .about-cadence__lede {
  margin-top: 18px;
  color: var(--nt-silver);
}

.page-about .about-beats {
  display: grid;
  gap: 16px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-beat {
  position: relative;
  padding: 24px 22px 22px;
  background: linear-gradient(160deg, rgba(27, 49, 89, 0.6), rgba(10, 20, 40, 0.7));
  border: 1px solid var(--about-hair);
  border-radius: 24px 10px 24px 10px;
  transition: transform var(--nt-ease) 240ms, border-color var(--nt-ease) 240ms;
}

.page-about .about-beat:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 107, 53, 0.45);
}

.page-about .about-beat__val {
  display: block;
  font-family: var(--nt-mono);
  font-size: 38px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--nt-mist);
}

.page-about .about-beat__val small {
  margin-left: 6px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--nt-cyan);
}

.page-about .about-beat:nth-child(2n) .about-beat__val small {
  color: var(--nt-gold);
}

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

.page-about .about-beat__text {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--nt-silver);
}

/* ---------- 发展历程 ---------- */
.page-about .about-history {
  padding-top: 62px;
}

.page-about .about-history__figure {
  margin-top: 30px;
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 4px 0 4px 24px;
  list-style: none;
  border-left: 1px solid rgba(79, 209, 197, 0.3);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 26px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--nt-deep);
  border: 2px solid var(--nt-cyan);
}

.page-about .about-timeline__item--origin::before {
  background: var(--nt-cyan);
}

.page-about .about-timeline__item--gold::before {
  border-color: var(--nt-gold);
  background: var(--nt-gold);
}

.page-about .about-timeline__stamp {
  display: block;
  font-family: var(--nt-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--nt-cyan);
}

.page-about .about-timeline__item--gold .about-timeline__stamp {
  color: var(--nt-gold);
}

.page-about .about-timeline__name {
  margin: 8px 0 0;
  font-size: 18px;
  font-weight: 700;
  color: var(--nt-mist);
}

.page-about .about-timeline__text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.74;
  color: var(--nt-silver);
}

/* ---------- 服务范围 ---------- */
.page-about .about-scale {
  padding-top: 62px;
  padding-bottom: 72px;
}

.page-about .about-scale__head {
  max-width: 60ch;
}

.page-about .about-scale__grid {
  display: grid;
  gap: 14px;
  margin-top: 34px;
}

.page-about .about-scale__cell {
  padding: 22px 22px 20px;
  background: var(--about-panel-deep);
  border: 1px solid var(--about-hair);
  border-radius: var(--nt-r-md);
}

.page-about .about-scale__cell--hero {
  background: linear-gradient(150deg, rgba(27, 49, 89, 0.92), rgba(10, 20, 40, 0.82));
  border-color: rgba(79, 209, 197, 0.34);
}

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

.page-about .about-scale__val {
  display: block;
  font-family: var(--nt-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--nt-mist);
}

.page-about .about-scale__val small {
  margin-left: 5px;
  font-size: 14px;
  font-weight: 500;
  color: var(--nt-orange);
}

.page-about .about-scale__key {
  display: block;
  margin-top: 12px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--nt-silver);
}

.page-about .about-scale__text {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--nt-silver);
}

.page-about .about-platforms {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-platforms li {
  padding: 7px 13px;
  font-size: 13.5px;
  color: var(--nt-mist);
  background: rgba(79, 209, 197, 0.1);
  border: 1px solid rgba(79, 209, 197, 0.32);
  border-radius: 999px;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: 40px;
}

.page-about .about-cta__panel {
  display: grid;
  gap: 24px;
  padding: 30px 26px;
  background: linear-gradient(120deg, rgba(255, 107, 53, 0.14), rgba(16, 31, 60, 0.9) 58%);
  border: 1px solid rgba(255, 107, 53, 0.34);
  border-radius: var(--nt-r-lg) 10px var(--nt-r-lg) 10px;
}

.page-about .about-cta__title {
  margin: 10px 0 0;
  font-size: clamp(22px, 4.8vw, 32px);
  line-height: 1.2;
  color: var(--nt-mist);
}

.page-about .about-cta__text {
  margin: 12px 0 0;
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--nt-silver);
}

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

/* ---------- 锚点偏移 ---------- */
.page-about #about-team,
.page-about #about-flow,
.page-about #about-cadence,
.page-about #about-history,
.page-about #about-scale {
  scroll-margin-top: calc(var(--nt-header-h) + 26px);
}

/* ---------- 断点：平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding-top: 34px;
  }

  .page-about .about-hero__grid {
    gap: 40px;
  }

  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px 16px;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

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

  .page-about .about-beats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-scale__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-cta__panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 36px 34px;
  }
}

/* ---------- 断点：桌面 ---------- */
@media (min-width: 1000px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: 52px;
  }

  .page-about .about-jump {
    gap: 12px;
  }

  .page-about .about-team,
  .page-about .about-cadence,
  .page-about .about-history,
  .page-about .about-scale {
    padding-top: 78px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 54px;
    align-items: start;
  }

  .page-about .about-split__lead {
    position: sticky;
    top: calc(var(--nt-header-h) + 28px);
  }

  .page-about .about-split--timeline {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  }

  .page-about .about-flow__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 46px;
    align-items: start;
    margin-top: 42px;
  }

  .page-about .about-flow__figure {
    max-width: none;
    position: sticky;
    top: calc(var(--nt-header-h) + 28px);
  }

  .page-about .about-steps {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

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

  .page-about .about-scale__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-scale__cell--platform {
    grid-column: span 2;
  }
}

/* ---------- 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-beat,
  .page-about .about-jump__link,
  .page-about .about-step {
    transition: none;
  }

  .page-about .about-role:hover,
  .page-about .about-beat:hover {
    transform: none;
  }
}