.page-about {
  --about-hair: rgba(227, 242, 253, .14);
  --about-soft: rgba(227, 242, 253, .28);
  position: relative;
  color: var(--snow);
  padding-bottom: 72px;
  overflow-x: hidden;
  overflow-x: clip;
}

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

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 30px 0 12px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -20% auto -20%;
  height: 560px;
  background:
    radial-gradient(58% 62% at 10% 0%, rgba(79, 195, 247, .26), transparent 70%),
    radial-gradient(48% 54% at 92% 8%, rgba(124, 255, 203, .16), transparent 72%);
  pointer-events: none;
}

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

.page-about .about-hero__title {
  margin: 20px 0 0;
  font-size: clamp(30px, 6.4vw, 76px);
  font-weight: 200;
  line-height: 1.1;
  letter-spacing: -.02em;
  max-width: 24ch;
  text-shadow: 0 0 26px rgba(79, 195, 247, .18);
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--ice);
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 48ch;
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.9;
  color: rgba(244, 250, 255, .82);
}

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

/* ---------- 数字带 ---------- */

.page-about .factband {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 44px 0 0;
  padding: 0;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .factband__cell {
  background: var(--ink-800);
  padding: 20px 18px;
}

.page-about .factband__key {
  margin: 0;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
}

.page-about .factband__val {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1;
  color: var(--aurora);
}

.page-about .factband__unit {
  margin-left: 6px;
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0;
  color: var(--mist);
}

/* ---------- 章节骨架 ---------- */

.page-about .chapter {
  border-top: 1px solid var(--about-hair);
}

.page-about .chapter .wrap {
  display: grid;
  gap: 14px;
  padding-top: 44px;
  padding-bottom: 44px;
}

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

.page-about .chapter__num {
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--ice);
}

.page-about .chapter__bar {
  flex: 1 1 auto;
  height: 1px;
  background: linear-gradient(90deg, rgba(79, 195, 247, .5), rgba(79, 195, 247, 0));
}

.page-about .chapter__title {
  margin: 0 0 20px;
  font-size: clamp(24px, 3.6vw, 46px);
  font-weight: 300;
  line-height: 1.22;
  letter-spacing: -.01em;
  max-width: 24ch;
}

.page-about .chapter__note {
  margin: -8px 0 26px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .chapter__content > .media {
  margin: 0 0 26px;
}

/* ---------- 厂商入驻三步 ---------- */

.page-about .steps {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .step {
  position: relative;
  padding: 24px 22px 22px;
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(18, 58, 92, .82), rgba(15, 42, 68, .72));
  border: 1px solid var(--about-hair);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.page-about .step::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 26px;
  height: 26px;
  background: linear-gradient(225deg, rgba(124, 255, 203, .55), rgba(124, 255, 203, 0) 70%);
  clip-path: polygon(100% 0, 100% 100%, 0 0);
}

.page-about .step__no {
  display: block;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--aurora);
}

.page-about .step__title {
  margin: 10px 0 8px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--snow);
}

.page-about .step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(244, 250, 255, .72);
}

/* ---------- 分类体系 ---------- */

.page-about .split {
  display: grid;
  gap: 30px;
}

.page-about .tagrail {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about .tagcell {
  position: relative;
  display: inline-flex;
}

.page-about .tagcell .tag {
  cursor: default;
  transition: transform .2s var(--ease), color .2s var(--ease);
}

.page-about .tagcell:hover .tag {
  transform: translateY(-2px);
}

.page-about .tagcell__pop {
  position: absolute;
  left: 0;
  top: calc(100% + 9px);
  z-index: 6;
  min-width: 178px;
  padding: 12px 14px;
  border-radius: 14px;
  background: var(--ink-700);
  border: 1px solid rgba(124, 255, 203, .3);
  font-size: 13px;
  line-height: 1.75;
  color: var(--line);
  box-shadow: 0 18px 38px rgba(6, 18, 31, .55);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-5px);
  transition: opacity .22s var(--ease), transform .22s var(--ease), visibility .22s;
  pointer-events: none;
}

.page-about .tagrail__hint {
  margin: 16px 0 0;
  font-size: 12.5px;
  letter-spacing: .02em;
  color: var(--mist);
}

/* ---------- 团队 ---------- */

.page-about .teamlist {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .teamlist__item {
  padding: 20px 0 20px 18px;
  border-bottom: 1px solid var(--about-hair);
  border-left: 2px solid transparent;
  transition: border-color .25s var(--ease), background .25s var(--ease);
}

.page-about .teamlist__item:hover {
  border-left-color: var(--ice);
  background: rgba(18, 58, 92, .34);
}

.page-about .teamlist__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ice);
}

.page-about .teamlist__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(244, 250, 255, .76);
}

.page-about .network {
  margin-top: 28px;
  padding: 22px 22px 20px;
  border-radius: var(--radius);
  background: rgba(11, 30, 51, .74);
  border: 1px solid var(--about-hair);
  border-left: 3px solid var(--aurora);
}

.page-about .network p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.9;
  color: rgba(244, 250, 255, .8);
}

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

.page-about .network strong {
  color: var(--aurora);
  font-weight: 600;
}

/* ---------- 版本时间轴 ---------- */

.page-about .timeline {
  list-style: none;
  margin: 8px 0 0;
  padding: 6px 0 6px 28px;
  position: relative;
  display: grid;
  gap: 30px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, rgba(79, 195, 247, .75), rgba(124, 255, 203, .4) 60%, rgba(124, 255, 203, 0));
}

.page-about .timeline__item {
  position: relative;
}

.page-about .timeline__node {
  position: absolute;
  left: -28px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 3px;
  transform: rotate(45deg);
  background: var(--ice);
  box-shadow: 0 0 0 4px rgba(79, 195, 247, .16);
}

.page-about .timeline__item:nth-child(even) .timeline__node {
  background: var(--aurora);
  box-shadow: 0 0 0 4px rgba(124, 255, 203, .14);
}

.page-about .timeline__item--current .timeline__node {
  background: var(--ember);
  box-shadow: 0 0 0 5px rgba(255, 138, 61, .18);
}

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

.page-about .timeline__ver {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--aurora);
}

.page-about .timeline__item--current .timeline__ver {
  color: var(--ember);
}

.page-about .timeline__title {
  margin: 0 0 8px;
  font-size: clamp(18px, 2.2vw, 23px);
  font-weight: 500;
  line-height: 1.4;
  color: var(--snow);
}

.page-about .timeline__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.9;
  color: rgba(244, 250, 255, .74);
}

/* ---------- 双栏价值 ---------- */

.page-about .twoup {
  display: grid;
  gap: 18px;
}

.page-about .twoup__col {
  padding: 26px 22px 24px;
  border-radius: var(--radius);
  background: rgba(15, 42, 68, .72);
  border: 1px solid var(--about-hair);
}

.page-about .twoup__col--player {
  border-top: 3px solid var(--ice);
}

.page-about .twoup__col--vendor {
  border-top: 3px solid var(--neon);
}

.page-about .twoup__label {
  margin: 0;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--mist);
}

.page-about .twoup__title {
  margin: 10px 0 16px;
  font-size: 21px;
  font-weight: 500;
  color: var(--snow);
}

.page-about .twoup__list {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .twoup__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(244, 250, 255, .78);
}

.page-about .twoup__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  transform: rotate(45deg);
  background: var(--ice);
}

.page-about .twoup__col--vendor .twoup__list li::before {
  background: var(--neon);
}

/* ---------- 尾部入口 ---------- */

.page-about .about-cta {
  padding: 8px 0 0;
}

.page-about .cta-panel {
  position: relative;
  padding: 34px 24px 32px;
  border-radius: var(--radius);
  background:
    radial-gradient(70% 120% at 100% 0%, rgba(139, 92, 246, .22), transparent 68%),
    linear-gradient(150deg, rgba(18, 58, 92, .92), rgba(6, 18, 31, .92));
  border: 1px solid var(--about-soft);
  overflow: hidden;
}

.page-about .cta-panel__title {
  margin: 0 0 12px;
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 300;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--snow);
}

.page-about .cta-panel__lead {
  margin: 0;
  max-width: 52ch;
  font-size: 14.5px;
  line-height: 1.9;
  color: rgba(244, 250, 255, .76);
}

.page-about .cta-panel__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 交互能力增强 ---------- */

@media (hover: hover) and (min-width: 900px) {
  .page-about .tagcell:hover .tagcell__pop,
  .page-about .tagcell:focus-within .tagcell__pop {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
}

/* ---------- 平板 ---------- */

@media (min-width: 700px) {
  .page-about .factband {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .cta-panel {
    padding: 44px 40px 40px;
  }
}

/* ---------- 桌面：细索引轨道 + 宽内容 ---------- */

@media (min-width: 1000px) {
  .page-about .about-hero {
    padding-top: 42px;
  }

  .page-about .chapter .wrap {
    grid-template-columns: 92px minmax(0, 1fr);
    column-gap: 46px;
    padding-top: 68px;
    padding-bottom: 68px;
  }

  .page-about .chapter__index {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding-top: 6px;
  }

  .page-about .chapter__bar {
    flex: 0 0 60px;
    width: 1px;
    height: 60px;
    background: linear-gradient(180deg, rgba(79, 195, 247, .55), rgba(79, 195, 247, 0));
  }

  .page-about .chapter__title {
    margin-bottom: 26px;
  }

  .page-about .split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    column-gap: 46px;
    align-items: start;
  }

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

  .page-about .teamlist__item {
    padding: 22px 0 22px 22px;
  }

  .page-about .timeline {
    padding-left: 36px;
    gap: 34px;
  }

  .page-about .timeline__node {
    left: -36px;
  }

  .page-about .cta-panel {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) auto;
    align-items: end;
    column-gap: 40px;
    padding: 52px 48px 46px;
  }

  .page-about .cta-panel__links {
    margin-top: 0;
    justify-content: flex-end;
  }
}

@media (min-width: 1200px) {
  .page-about .chapter .wrap {
    grid-template-columns: 104px minmax(0, 1fr);
    column-gap: 56px;
  }
}

/* ---------- 降低动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .tagcell .tag,
  .page-about .tagcell__pop,
  .page-about .teamlist__item {
    transition: none;
  }

  .page-about .tagcell:hover .tag {
    transform: none;
  }
}