.page-about {
  --about-hair: rgba(168, 176, 200, .16);
  --about-hair-strong: rgba(168, 176, 200, .3);
  --about-cell: rgba(19, 26, 58, .58);
  display: block;
  background: var(--deep-space);
  color: var(--mist-white);
  overflow-x: hidden;
}

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

.page-about .section {
  padding: var(--section-gap) 0;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(24px, 5vw, 56px) 0 clamp(64px, 9vw, 132px);
  background:
    radial-gradient(90% 70% at 84% 2%, rgba(47, 227, 214, .18), transparent 60%),
    radial-gradient(80% 62% at 4% 90%, rgba(108, 75, 246, .24), transparent 64%),
    var(--deep-space);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: .45;
  background-image:
    linear-gradient(to right, var(--about-hair) 1px, transparent 1px),
    linear-gradient(to bottom, var(--about-hair) 1px, transparent 1px);
  background-size: 96px 96px;
  mask-image: radial-gradient(120% 82% at 52% 18%, #000 18%, transparent 82%);
  -webkit-mask-image: radial-gradient(120% 82% at 52% 18%, #000 18%, transparent 82%);
}

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

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(28px, 5vw, 56px);
  font-size: var(--fs-12);
  letter-spacing: .08em;
  color: var(--alloy-grey);
}

.page-about .breadcrumb a {
  color: var(--alloy-grey);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--ion-cyan);
  border-bottom-color: var(--ion-cyan);
}

.page-about .breadcrumb__sep {
  color: rgba(168, 176, 200, .5);
}

.page-about .about-hero__display {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: clamp(12px, 2vw, 24px);
}

.page-about .about-hero h1 {
  margin: 0;
  font-size: var(--fs-display);
  font-weight: 900;
  line-height: 1.03;
  letter-spacing: -.03em;
}

.page-about .about-hero h1 > span {
  display: block;
}

.page-about .about-h1-accent {
  color: transparent;
  background: linear-gradient(96deg, var(--ion-cyan) 6%, var(--nebula-violet) 58%, var(--solar-gold));
  -webkit-background-clip: text;
  background-clip: text;
}

.page-about .about-vert {
  margin: 0;
  font-family: var(--font-en);
  font-size: var(--fs-12);
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--alloy-grey);
}

.page-about .about-hero__lead {
  max-width: 62ch;
  margin: clamp(24px, 4vw, 40px) 0 0;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--alloy-grey);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(28px, 4vw, 44px);
}

/* ---------- 起点与维护 ---------- */

.page-about .about-origin {
  background: linear-gradient(180deg, var(--deep-space), var(--orbital-navy) 38%, var(--orbital-navy));
}

.page-about .about-origin__grid {
  display: grid;
  gap: clamp(28px, 5vw, 64px);
}

.page-about .about-origin__body p {
  margin: 0 0 20px;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--alloy-grey);
}

.page-about .about-origin__body p:last-of-type {
  margin-bottom: 0;
}

.page-about .about-origin__marks {
  list-style: none;
  margin: clamp(30px, 4vw, 46px) 0 0;
  padding: 0;
}

.page-about .about-origin__marks li {
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding: 16px 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-origin__marks li:last-child {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-origin__marks strong {
  flex: 0 0 auto;
  min-width: 4.2em;
  font-family: var(--font-mono);
  font-size: var(--fs-20);
  font-weight: 500;
  color: var(--ion-cyan);
}

.page-about .about-origin__marks span {
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--alloy-grey);
}

/* ---------- 栏目分工 ---------- */

.page-about .about-columns {
  background: var(--orbital-navy);
}

.page-about .about-columns__layout {
  display: grid;
  gap: clamp(32px, 4vw, 56px);
  margin-top: clamp(36px, 5vw, 64px);
}

.page-about .about-columns__figure {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--about-hair);
}

.page-about .about-columns__figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-columns__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-plate {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: clamp(18px, 2.4vw, 26px) clamp(16px, 2vw, 24px);
  border-radius: var(--r-md);
  border: 1px solid transparent;
  background: var(--about-cell);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-plate:hover,
.page-about .about-plate:focus-within {
  border-color: var(--ion-cyan);
  background: rgba(19, 26, 58, .92);
  transform: translateX(4px);
}

.page-about .about-plate .plate__index {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  letter-spacing: .12em;
  color: var(--ion-cyan);
}

.page-about .about-plate .plate__body h3 {
  margin: 0 0 6px;
  font-size: var(--fs-20);
  font-weight: 700;
  color: var(--mist-white);
}

.page-about .about-plate .plate__body p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--alloy-grey);
}

/* ---------- 双语编辑与图示 ---------- */

.page-about .about-team {
  background: var(--deep-space);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(32px, 5vw, 64px);
}

.page-about .about-team__lead {
  margin: clamp(16px, 2vw, 24px) 0 0;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--alloy-grey);
}

.page-about .about-team__accordion {
  margin-top: clamp(24px, 3vw, 36px);
}

.page-about .about-team__acc-h {
  margin: 0;
  font-size: var(--fs-16);
  font-weight: 700;
}

.page-about .accordion__panel p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--alloy-grey);
}

.page-about .about-team__figure {
  margin: 0;
  border-radius: var(--r-xl);
  overflow: hidden;
  border: 1px solid var(--about-hair);
  background: linear-gradient(150deg, var(--nebula-mid), var(--orbital-navy));
}

.page-about .about-team__figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 版本时间轴 ---------- */

.page-about .about-timeline {
  background: linear-gradient(180deg, var(--orbital-navy), var(--deep-space) 72%);
}

.page-about .about-track {
  list-style: none;
  margin: clamp(40px, 6vw, 72px) 0 0;
  padding: 0;
  max-width: 880px;
}

.page-about .about-track__item {
  position: relative;
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: clamp(16px, 3vw, 32px);
  padding-bottom: clamp(30px, 4.5vw, 56px);
}

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 22px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan-16), rgba(47, 227, 214, .02));
}

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

.page-about .about-track__item:last-child::before {
  display: none;
}

.page-about .about-track__marker {
  position: relative;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: var(--deep-space);
  display: grid;
  place-items: center;
}

.page-about .about-track__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ion-cyan);
  box-shadow: 0 0 16px rgba(47, 227, 214, .7);
}

.page-about .about-track__era {
  display: inline-block;
  margin: 0 0 12px;
  padding: 4px 14px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(108, 75, 246, .34);
  background: var(--violet-16);
  font-size: var(--fs-12);
  letter-spacing: .1em;
  color: var(--alloy-grey);
}

.page-about .about-track__body h3 {
  margin: 0 0 10px;
  font-size: var(--fs-20);
  font-weight: 700;
  color: var(--mist-white);
}

.page-about .about-track__body p {
  margin: 0;
  max-width: 56ch;
  font-size: var(--fs-14);
  line-height: 1.9;
  color: var(--alloy-grey);
}

/* ---------- 服务点与覆盖 ---------- */

.page-about .about-network {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(80% 90% at 92% 10%, rgba(108, 75, 246, .2), transparent 62%),
    var(--orbital-navy);
}

.page-about .about-network__inner {
  display: grid;
  gap: clamp(32px, 5vw, 64px);
}

.page-about .about-network__intro {
  margin: clamp(16px, 2vw, 24px) 0 0;
  max-width: 58ch;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--alloy-grey);
}

.page-about .about-network__stats {
  list-style: none;
  margin: clamp(28px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.page-about .about-network__stats li {
  padding-top: 14px;
  border-top: 1px solid var(--about-hair-strong);
}

.page-about .about-network__stats strong {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-28);
  font-weight: 500;
  line-height: 1.1;
  color: var(--solar-gold);
}

.page-about .about-network__stats span {
  display: block;
  margin-top: 8px;
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--alloy-grey);
}

.page-about .about-network__figure {
  margin: 0;
  border-radius: var(--r-xl);
  overflow: hidden;
  border: 1px solid var(--about-hair);
}

.page-about .about-network__figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 规模与节奏 ---------- */

.page-about .about-scale {
  background: var(--deep-space);
}

.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(40px, 5vw, 64px) 0 0;
  padding: 0;
  border: 1px solid var(--about-hair);
  border-radius: var(--r-lg);
  background: var(--about-hair);
  overflow: hidden;
}

.page-about .about-scale__cell {
  margin: 0;
  padding: clamp(24px, 3vw, 36px);
  background: var(--orbital-navy);
}

.page-about .about-scale__cell dt {
  font-size: var(--fs-14);
  letter-spacing: .08em;
  color: var(--alloy-grey);
}

.page-about .about-scale__cell dd {
  margin: 12px 0 0;
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-size: clamp(38px, 5vw, 54px);
  font-weight: 500;
  line-height: 1;
  color: var(--mist-white);
}

.page-about .about-unit {
  margin-left: 6px;
  font-size: var(--fs-14);
  color: var(--alloy-grey);
}

.page-about .about-scale__note {
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--alloy-grey);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  padding: 0 0 var(--section-gap);
  background: var(--deep-space);
}

.page-about .about-cta__inner {
  padding: clamp(32px, 5vw, 72px);
  border-radius: var(--r-xl);
  border: 1px solid var(--about-hair);
  background:
    radial-gradient(120% 140% at 88% 8%, rgba(108, 75, 246, .42), transparent 62%),
    radial-gradient(90% 120% at 2% 98%, rgba(47, 227, 214, .18), transparent 64%),
    var(--nebula-mid);
}

.page-about .about-cta__title {
  margin: 0;
  font-size: var(--fs-title);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -.01em;
}

.page-about .about-cta__text {
  margin: clamp(16px, 2vw, 24px) 0 0;
  max-width: 58ch;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--alloy-grey);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(24px, 3vw, 36px);
}

/* ---------- 响应式 ---------- */

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

  .page-about .about-origin__marks li {
    align-items: center;
  }
}

@media (min-width: 960px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-hero__display {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
    gap: 40px;
  }

  .page-about .about-vert {
    writing-mode: vertical-rl;
    letter-spacing: .3em;
    padding-bottom: 6px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-columns__layout {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }

  .page-about .about-network__inner {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: center;
  }
}

@media (min-width: 1080px) {
  .page-about .about-scale__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
  }
}