.page-about {
  --about-notch: 18px;
  --about-line: rgba(138, 153, 176, .22);
  background: var(--ink-0);
  color: var(--mist);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: calc(var(--head-h) + 40px) 0 48px;
  background:
    linear-gradient(160deg, rgba(27, 58, 107, .34) 0%, rgba(6, 11, 24, 0) 58%),
    linear-gradient(200deg, rgba(56, 242, 224, .08) 0%, rgba(6, 11, 24, 0) 42%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  top: 8%;
  width: 62%;
  height: 74%;
  background: linear-gradient(220deg, rgba(56, 242, 224, .10), rgba(15, 169, 160, .02) 62%, transparent);
  clip-path: polygon(14% 0, 100% 0, 86% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 32px;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 20px;
  font-size: 13px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(30px, 8vw, 58px);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.06;
  color: var(--mist);
  margin: 12px 0 20px;
  max-width: 16em;
}

.page-about .about-hero__lede-text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--dim);
  max-width: 40em;
  margin: 0 0 26px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 32px;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-notch)), calc(100% - var(--about-notch)) 100%, 0 100%);
}

.page-about .about-facts__row {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 16px;
  background: var(--ink-1);
}

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

.page-about .about-facts__val {
  margin: 0 0 0 auto;
  font-size: 22px;
  font-weight: 700;
  color: var(--cyan);
  text-shadow: 0 0 18px var(--glow);
}

.page-about .about-hero__media {
  margin: 0;
  border: 1px solid var(--about-line);
}

/* ---------- 时间轴 ---------- */

.page-about .about-track {
  position: relative;
  background: var(--ink-0);
}

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

.page-about .about-track__title {
  font-family: var(--font-display);
  font-size: clamp(24px, 6vw, 40px);
  font-weight: 900;
  letter-spacing: -.01em;
  line-height: 1.12;
  margin: 10px 0 12px;
  color: var(--mist);
}

.page-about .about-track__note {
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate);
  max-width: 38em;
  margin: 0;
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  display: grid;
  gap: 22px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--cyan-deep) 46%, rgba(138, 153, 176, .18) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 18px 18px 20px;
  background: var(--ink-1);
  border: 1px solid var(--about-line);
  border-left: 2px solid rgba(56, 242, 224, .38);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: border-color .16s var(--ease), box-shadow .16s var(--ease), transform .16s var(--ease);
}

.page-about .about-timeline__item:hover {
  border-color: rgba(56, 242, 224, .5);
  box-shadow: 0 0 0 1px rgba(56, 242, 224, .22), 0 12px 26px rgba(6, 11, 24, .5);
  transform: translate(4px, 4px);
}

.page-about .about-timeline__tick {
  position: absolute;
  left: -27px;
  top: 24px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink-0);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 12px var(--glow);
}

.page-about .about-timeline__ver {
  display: inline-block;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cyan);
  padding: 3px 9px;
  border: 1px solid rgba(56, 242, 224, .36);
  background: rgba(56, 242, 224, .07);
  margin-bottom: 12px;
}

.page-about .about-timeline__stage {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  line-height: 1.35;
  color: var(--mist);
  margin: 0 0 10px;
}

.page-about .about-timeline__text {
  font-size: 14px;
  line-height: 1.78;
  color: var(--dim);
  margin: 0;
}

.page-about .about-track__foot {
  margin: 26px 0 0;
  padding: 16px 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--dim);
  background: rgba(27, 58, 107, .3);
  border-left: 2px solid var(--orange);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

/* ---------- 数据来源（暖纸反转） ---------- */

.page-about .about-data {
  background: var(--paper);
  color: var(--paper-ink);
  clip-path: polygon(0 3.2%, 100% 0, 100% 100%, 0 100%);
  padding-top: 84px;
}

.page-about .about-data__title {
  font-family: var(--font-editorial);
  font-size: clamp(24px, 5.6vw, 40px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--paper-ink);
  margin: 10px 0 18px;
}

.page-about .about-data .kicker {
  color: var(--paper-ink);
  opacity: .62;
}

.page-about .about-data__prose p {
  font-family: var(--font-editorial);
  font-size: 15px;
  line-height: 1.9;
  color: #2A3242;
  max-width: 36em;
}

.page-about .about-data__prose p + p {
  margin-top: 18px;
}

.page-about .about-data__prose .mono {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--paper-ink);
  padding: 0 2px;
  background: rgba(255, 90, 43, .16);
}

.page-about .about-data__media {
  margin: 28px 0 0;
  border: 1px solid rgba(17, 24, 38, .16);
}

.page-about .about-data__media .media__caption {
  color: rgba(17, 24, 38, .6);
}

.page-about .about-data__split {
  display: grid;
  gap: 32px;
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  background: var(--ink-0);
}

.page-about .about-team__title {
  font-family: var(--font-display);
  font-size: clamp(24px, 6vw, 40px);
  font-weight: 900;
  line-height: 1.12;
  color: var(--mist);
  margin: 10px 0 12px;
}

.page-about .about-team__note {
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate);
  max-width: 38em;
  margin: 0;
}

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

.page-about .about-team__card {
  padding: 22px 20px;
  background: var(--ink-1);
  border: 1px solid var(--about-line);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .about-team__idx {
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -.02em;
  text-shadow: 0 0 20px var(--glow);
}

.page-about .about-team__role {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  color: var(--mist);
  margin: 0;
}

.page-about .about-team__desc {
  font-size: 14px;
  line-height: 1.78;
  color: var(--dim);
  margin: 0;
}

.page-about .about-team__foot {
  margin: 26px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate);
  max-width: 44em;
}

.page-about .about-team__foot .mono {
  font-family: var(--font-mono);
  color: var(--mist);
  font-weight: 700;
}

/* ---------- 覆盖范围 ---------- */

.page-about .about-reach {
  background:
    linear-gradient(180deg, rgba(15, 169, 160, .05) 0%, rgba(6, 11, 24, 0) 50%),
    var(--ink-0);
}

.page-about .about-reach__split {
  display: grid;
  gap: 30px;
  align-items: start;
}

.page-about .about-reach__media {
  margin: 0;
  border: 1px solid var(--about-line);
}

.page-about .about-reach__title {
  font-family: var(--font-display);
  font-size: clamp(24px, 6vw, 40px);
  font-weight: 900;
  line-height: 1.12;
  color: var(--mist);
  margin: 10px 0 14px;
}

.page-about .about-reach__lede {
  font-size: 15px;
  line-height: 1.8;
  color: var(--dim);
  max-width: 36em;
  margin: 0 0 24px;
}

.page-about .about-reach__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-reach__stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 14px;
  background: linear-gradient(160deg, var(--ink-1) 0%, rgba(15, 169, 160, .16) 100%);
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: border-color .16s var(--ease), box-shadow .16s var(--ease), transform .16s var(--ease);
}

.page-about .about-reach__stat:hover {
  border-color: rgba(56, 242, 224, .5);
  box-shadow: 0 0 0 1px rgba(56, 242, 224, .24), 0 12px 24px rgba(6, 11, 24, .55);
  transform: translate(4px, 4px);
}

.page-about .about-reach__num {
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -.02em;
}

.page-about .about-reach__label {
  font-size: 13px;
  color: var(--mist);
  font-weight: 600;
}

.page-about .about-reach__sub {
  font-size: 12px;
  line-height: 1.65;
  color: var(--slate);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height .2s var(--ease), opacity .2s var(--ease);
}

.page-about .about-reach__stat:hover .about-reach__sub,
.page-about .about-reach__stat:focus-within .about-reach__sub {
  max-height: 6em;
  opacity: 1;
}

/* ---------- 里程碑 ---------- */

.page-about .about-milestones {
  background: var(--ink-0);
  padding-bottom: 72px;
}

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

.page-about .about-milestones__title {
  font-family: var(--font-display);
  font-size: clamp(24px, 6vw, 40px);
  font-weight: 900;
  line-height: 1.12;
  color: var(--mist);
  margin: 10px 0 12px;
}

.page-about .about-milestones__note {
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate);
  max-width: 38em;
  margin: 0;
}

.page-about .about-milestones__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-milestones__item {
  display: grid;
  gap: 8px;
  padding: 18px 0;
  border-bottom: 1px solid var(--about-line);
  transition: background-color .16s var(--ease);
}

.page-about .about-milestones__item:hover {
  background: rgba(56, 242, 224, .045);
}

.page-about .about-milestones__tag {
  justify-self: start;
  font-size: 12px;
  letter-spacing: .06em;
}

.page-about .about-milestones__text {
  font-size: 14px;
  line-height: 1.82;
  color: var(--dim);
  margin: 0;
  max-width: 40em;
}

.page-about .about-milestones__cta {
  margin-top: 34px;
  padding: 24px 20px;
  background:
    linear-gradient(135deg, rgba(27, 58, 107, .5) 0%, rgba(15, 169, 160, .16) 100%),
    var(--ink-1);
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-notch)), calc(100% - var(--about-notch)) 100%, 0 100%);
}

.page-about .about-milestones__cta-text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--dim);
  margin: 0 0 18px;
  max-width: 34em;
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-timeline {
    padding-left: 0;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-timeline::before {
    left: 0;
    right: 0;
    top: -14px;
    bottom: auto;
    width: auto;
    height: 2px;
    background: linear-gradient(90deg, var(--cyan) 0%, var(--cyan-deep) 46%, rgba(138, 153, 176, .18) 100%);
  }

  .page-about .about-timeline__tick {
    left: 20px;
    top: -20px;
  }

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

  .page-about .about-milestones__item {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: start;
    gap: 18px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: calc(var(--head-h) + 66px) 0 76px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 38fr 62fr;
    gap: 44px;
    align-items: start;
  }

  .page-about .about-hero__media {
    align-self: stretch;
  }

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

  .page-about .about-data__split {
    grid-template-columns: 60fr 40fr;
    gap: 48px;
    align-items: center;
  }

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

  .page-about .about-reach__split {
    grid-template-columns: 30fr 70fr;
    gap: 44px;
    align-items: center;
  }

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

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

@media (min-width: 1200px) {
  .page-about .about-hero__title {
    font-size: clamp(40px, 4.6vw, 62px);
  }

  .page-about .about-track__title,
  .page-about .about-data__title,
  .page-about .about-team__title,
  .page-about .about-reach__title,
  .page-about .about-milestones__title {
    font-size: clamp(30px, 3vw, 42px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item,
  .page-about .about-reach__stat,
  .page-about .about-milestones__item,
  .page-about .about-reach__sub {
    transition: none;
  }

  .page-about .about-timeline__item:hover,
  .page-about .about-reach__stat:hover {
    transform: none;
  }
}