.page-about {
  --about-rail-w: 216px;
  --about-hair: rgba(44, 49, 64, .8);
  --about-line: rgba(232, 181, 74, .38);
  --about-card: rgba(27, 31, 43, .72);
  display: block;
  background: var(--void);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + clamp(46px, 8vw, 104px)) 0 clamp(48px, 7vw, 92px);
  background:
    radial-gradient(112% 76% at 16% 0%, rgba(139, 92, 246, .15) 0%, transparent 58%),
    radial-gradient(88% 66% at 84% 10%, rgba(56, 214, 245, .08) 0%, transparent 62%),
    linear-gradient(180deg, var(--void) 0%, var(--plinth) 100%);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-hero-glow {
  top: -14%;
  left: 14%;
  width: clamp(120px, 22vw, 260px);
  height: 128%;
  background: linear-gradient(180deg, rgba(232, 181, 74, 0) 0%, rgba(232, 181, 74, .18) 32%, rgba(232, 181, 74, .06) 78%, rgba(232, 181, 74, 0) 100%);
  filter: blur(18px);
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 2;
}

.page-about .about-crumbs {
  margin-bottom: clamp(28px, 5vw, 52px);
}

.page-about .about-eyebrow {
  margin: 0 0 18px;
  color: var(--gold);
}

.page-about .about-title {
  margin: 0;
  max-width: 16ch;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(42px, 8.4vw, 118px);
  line-height: 1.06;
  letter-spacing: .04em;
  color: var(--warm);
}

.page-about .about-title em {
  font-style: normal;
  color: transparent;
  -webkit-text-stroke: 1px var(--gold);
  text-shadow: 0 0 34px rgba(232, 181, 74, .28);
}

.page-about .about-lede {
  max-width: 62ch;
  margin: clamp(24px, 3.6vw, 38px) 0 0;
  font-size: 17px;
  line-height: 1.9;
  color: var(--warm-72);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(38px, 5.4vw, 64px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-figure {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 20px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-figure-num {
  flex: 0 0 auto;
  font-family: var(--font-num);
  font-size: clamp(30px, 5.2vw, 46px);
  font-weight: 500;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-figure-label {
  font-size: 14px;
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--ash);
}

/* ---------- 主体双栏 ---------- */

.page-about .about-body {
  padding-top: clamp(48px, 7vw, 96px);
  padding-bottom: clamp(64px, 9vw, 128px);
}

.page-about .about-rail {
  display: none;
}

.page-about .about-flow {
  min-width: 0;
}

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

.page-about .about-section-lede {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--warm-72);
}

/* ---------- 时间轴 ---------- */

.page-about .about-era-section {
  position: relative;
  overflow: hidden;
  padding-top: clamp(40px, 6vw, 72px);
  padding-bottom: clamp(40px, 6vw, 72px);
}

.page-about .about-era-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .16;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-era-veil {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--void) 0%, rgba(7, 8, 12, .62) 24%, rgba(7, 8, 12, .62) 76%, var(--void) 100%);
  pointer-events: none;
  z-index: 1;
}

.page-about .about-era-section > .section-head,
.page-about .era-list {
  position: relative;
  z-index: 2;
}

.page-about .era-list {
  position: relative;
  margin: clamp(38px, 5.6vw, 68px) 0 0;
  padding: 0 0 0 34px;
  list-style: none;
}

.page-about .era-list::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 14px;
  left: 9px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--gold-deep) 58%, rgba(138, 102, 32, .12) 100%);
}

.page-about .era-item {
  position: relative;
  padding-bottom: clamp(34px, 4.6vw, 54px);
}

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

.page-about .era-item::before {
  content: "";
  position: absolute;
  top: 9px;
  left: -30px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 16px rgba(232, 181, 74, .55);
}

.page-about .era-item--now::before {
  background: transparent;
  border: 1px solid var(--gold-40);
  box-shadow: none;
  animation: about-pulse 6s ease-in-out infinite;
}

@keyframes about-pulse {
  0%, 100% { opacity: .62; }
  50% { opacity: 1; }
}

.page-about .era-year {
  margin: 0 0 12px;
  font-family: var(--font-num);
  font-size: clamp(28px, 4.6vw, 40px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: .04em;
  color: var(--gold);
}

.page-about .era-card {
  padding: clamp(20px, 2.8vw, 28px);
  border: 1px solid var(--about-hair);
  border-radius: var(--r-md);
  background: var(--about-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.page-about .era-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.4;
  letter-spacing: .03em;
  color: var(--warm);
}

.page-about .era-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--warm-72);
}

/* ---------- 四类内容形态 ---------- */

.page-about .about-forms-section {
  padding-top: clamp(56px, 8vw, 104px);
}

.page-about .about-form-bento {
  margin-top: clamp(32px, 4.6vw, 56px);
}

.page-about .about-form-cell {
  padding: clamp(22px, 3vw, 32px);
  border: 1px solid var(--about-hair);
  border-radius: var(--r-md);
  background: linear-gradient(170deg, var(--colonnade) 0%, var(--plinth) 100%);
}

.page-about .about-form-cell--gate {
  background:
    radial-gradient(120% 130% at 0% 0%, rgba(232, 181, 74, .16) 0%, transparent 62%),
    linear-gradient(170deg, var(--colonnade) 0%, var(--plinth) 100%);
  border-color: var(--gold-40);
}

.page-about .about-form-title {
  margin: 16px 0 10px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(20px, 2.6vw, 27px);
  line-height: 1.34;
  letter-spacing: .04em;
  color: var(--warm);
}

.page-about .about-form-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.86;
  color: var(--warm-72);
}

/* ---------- 六个小组 ---------- */

.page-about .about-teams-section {
  position: relative;
  overflow: hidden;
  padding-top: clamp(64px, 9vw, 120px);
}

.page-about .about-teams-bg {
  position: absolute;
  top: 22%;
  left: 50%;
  transform: translateX(-50%);
  width: min(760px, 118%);
  height: auto;
  opacity: .12;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-teams-section > .section-head,
.page-about .about-teams {
  position: relative;
  z-index: 1;
}

.page-about .about-teams {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(32px, 4.6vw, 56px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-team {
  padding: 24px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-team-no {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .18em;
  color: var(--gold);
}

.page-about .about-team-name {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 500;
  letter-spacing: .03em;
  color: var(--warm);
}

.page-about .about-team-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--warm-56);
}

/* ---------- 协作与认可 ---------- */

.page-about .about-partners-section {
  padding-top: clamp(56px, 8vw, 104px);
}

.page-about .about-partner-grid {
  margin-top: clamp(30px, 4.2vw, 48px);
}

.page-about .about-partner-card {
  padding: clamp(22px, 3vw, 30px);
  border: 1px solid var(--about-hair);
  border-radius: var(--r-md);
  background: var(--plinth);
}

.page-about .about-honor {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: clamp(30px, 4.2vw, 48px);
  padding: clamp(22px, 3vw, 30px);
  border: 1px solid var(--gold-40);
  border-radius: var(--r-lg) var(--r-sm) var(--r-lg) var(--r-sm);
  background: radial-gradient(120% 150% at 100% 0%, rgba(56, 214, 245, .1) 0%, transparent 58%), var(--plinth);
}

.page-about .about-honor-text {
  margin: 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.88;
  color: var(--warm-72);
}

/* ---------- 覆盖范围 ---------- */

.page-about .about-coverage-section {
  padding-top: clamp(64px, 9vw, 120px);
}

.page-about .about-coverage-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 4.6vw, 56px);
  align-items: center;
}

.page-about .about-coverage-copy .section-title {
  margin-top: 14px;
}

.page-about .about-coverage-text {
  margin: 20px 0 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--warm-56);
}

.page-about .about-coverage-facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(26px, 3.6vw, 40px) 0 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-fact-key {
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--ash);
}

.page-about .about-fact-val {
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(24px, 3.6vw, 34px);
  font-weight: 500;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-fact-unit {
  margin-left: .4em;
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--ash);
}

.page-about .about-coverage-frame {
  border: 1px solid var(--about-hair);
  border-radius: var(--r-lg) var(--r-sm) var(--r-lg) var(--r-sm);
  background: var(--plinth);
}

/* ---------- 下一步 ---------- */

.page-about .about-next-section {
  padding-top: clamp(64px, 9vw, 120px);
}

.page-about .about-next {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: clamp(30px, 4.2vw, 48px);
}

.page-about .about-next-card {
  display: block;
  padding: clamp(22px, 3vw, 30px);
  border: 1px solid var(--about-hair);
  border-radius: var(--r-md);
  background: var(--plinth);
  text-decoration: none;
  transition: transform .42s var(--ease), border-color .42s var(--ease), background-color .42s var(--ease);
}

.page-about .about-next-card:hover,
.page-about .about-next-card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--gold-40);
  background: var(--colonnade);
}

.page-about .about-next-go {
  display: inline-block;
  margin-top: 18px;
  padding-bottom: 4px;
  font-size: 14px;
  letter-spacing: .08em;
  color: var(--electric);
  border-bottom: 1px solid rgba(56, 214, 245, .4);
}

.page-about .about-next-card:focus-visible {
  outline: 2px solid var(--electric);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-figures {
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
  }

  .page-about .about-figure {
    padding: 22px 22px 22px 0;
    border-bottom: 0;
    border-right: 1px solid var(--about-hair);
  }

  .page-about .about-figure:last-child {
    border-right: 0;
    padding-right: 0;
  }

  .page-about .about-teams {
    grid-template-columns: repeat(2, 1fr);
    column-gap: clamp(24px, 3.4vw, 44px);
    border-top: 1px solid var(--about-hair);
  }

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

@media (min-width: 900px) {
  .page-about .about-body {
    display: grid;
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 72px);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 32px);
    align-self: start;
    padding-right: 12px;
    border-right: 1px solid var(--about-hair);
  }

  .page-about .about-rail-title {
    margin: 0 0 18px;
    font-family: var(--font-index);
    font-size: 12px;
    letter-spacing: .2em;
    text-transform: uppercase;
    color: var(--ash);
  }

  .page-about .about-rail-list {
    margin: 0;
    padding: 0;
    list-style: none;
    counter-reset: about-rail;
  }

  .page-about .about-rail-list > li {
    counter-increment: about-rail;
    margin-bottom: 4px;
  }

  .page-about .about-rail-list .rail-link {
    display: block;
    padding: 9px 0 9px 30px;
    position: relative;
    font-size: 14px;
    line-height: 1.5;
    color: var(--warm-56);
    text-decoration: none;
    transition: color .3s var(--ease);
  }

  .page-about .about-rail-list .rail-link::before {
    content: counter(about-rail, decimal-leading-zero);
    position: absolute;
    left: 0;
    top: 9px;
    font-family: var(--font-num);
    font-size: 12px;
    letter-spacing: .1em;
    color: var(--stroke);
    transition: color .3s var(--ease);
  }

  .page-about .about-rail-list .rail-link:hover,
  .page-about .about-rail-list .rail-link[aria-current="true"] {
    color: var(--gold);
  }

  .page-about .about-rail-list .rail-link[aria-current="true"]::before {
    color: var(--gold);
  }

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

  .page-about .about-team {
    padding: 26px 0 30px;
  }

  .page-about .about-coverage-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 84px);
  }

  .page-about .about-forms-section .about-form-bento {
    grid-template-columns: repeat(4, 1fr);
    grid-auto-rows: minmax(190px, auto);
  }

  .page-about .about-form-cell--gate {
    grid-column: span 2;
    grid-row: span 2;
  }

  .page-about .era-item:nth-child(even) {
    padding-right: clamp(24px, 6vw, 96px);
  }

  .page-about .era-item:nth-child(even) .era-card {
    margin-left: clamp(20px, 7%, 96px);
  }

  .page-about .era-item:nth-child(odd) .era-card {
    max-width: 62ch;
  }
}

@media (min-width: 1200px) {
  .page-about .about-rail {
    padding-right: 24px;
  }

  .page-about .about-era-section {
    padding-left: clamp(0px, 2vw, 28px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .era-item--now::before {
    animation: none;
  }

  .page-about .about-next-card {
    transition: none;
  }
}