.page-about {
  --about-line: rgba(212, 160, 23, .26);
  --about-line-soft: rgba(212, 160, 23, .14);
  background: var(--ink);
  color: var(--platinum);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  overflow-x: hidden;
}

.page-about a {
  color: var(--jade-soft);
  text-decoration: none;
}

.page-about a:hover,
.page-about a:focus-visible {
  color: var(--lava);
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4vw, 44px) 0 clamp(30px, 5vw, 56px);
  border-bottom: 1px solid var(--gold-line);
  background:
    radial-gradient(130% 100% at 88% -12%, rgba(212, 160, 23, .16), transparent 62%),
    radial-gradient(90% 80% at 4% 112%, rgba(46, 196, 182, .12), transparent 60%),
    var(--ink);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -14%;
  right: -18%;
  width: 60vw;
  height: 60vw;
  max-width: 540px;
  max-height: 540px;
  background-image:
    repeating-linear-gradient(45deg, rgba(212, 160, 23, .18) 0 1px, transparent 1px 16px),
    repeating-linear-gradient(-45deg, rgba(212, 160, 23, .18) 0 1px, transparent 1px 16px);
  -webkit-mask-image: radial-gradient(circle at 68% 32%, #000 0%, transparent 68%);
  mask-image: radial-gradient(circle at 68% 32%, #000 0%, transparent 68%);
  pointer-events: none;
}

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

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--mist);
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .breadcrumbs a {
  color: var(--mist);
}

.page-about .breadcrumbs a:hover {
  color: var(--gold);
}

.page-about .breadcrumbs__sep {
  color: var(--gold-line);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--gold);
  margin: 0 0 14px;
}

.page-about .about-hero__title {
  margin: 0;
  font-size: clamp(30px, 8.4vw, 68px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--platinum);
  text-wrap: balance;
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-jump {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .about-jump__link {
  display: inline-block;
  padding: 7px 13px;
  border: 1px solid var(--gold-line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--platinum);
  transition: border-color .2s var(--ease), color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-jump__link:hover,
.page-about .about-jump__link:focus-visible {
  border-color: var(--lava);
  color: var(--lava);
  background: rgba(255, 107, 53, .07);
  text-decoration: none;
}

.page-about .about-facts {
  margin: 0;
  border: 1px solid var(--gold-line);
  border-top: 3px solid var(--gold);
  background: rgba(20, 24, 29, .72);
  backdrop-filter: blur(2px);
}

.page-about .about-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-facts__row:last-child {
  border-bottom: 0;
}

.page-about .about-facts__k {
  font-size: 12.5px;
  color: var(--mist);
  letter-spacing: .04em;
}

.page-about .about-facts__v {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: .02em;
  color: var(--gold);
  white-space: nowrap;
}

/* ---------- 通用章节 ---------- */

.page-about .about-sec {
  padding: clamp(38px, 6vw, 76px) 0;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-sec--end {
  border-bottom: 0;
  padding-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-sec__head {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-sec__head::before {
  content: "";
  display: block;
  width: 54px;
  height: 3px;
  margin-bottom: 14px;
  background: linear-gradient(90deg, var(--lava), var(--gold));
}

.page-about .about-sec__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold);
  margin-bottom: 8px;
}

.page-about .about-sec__title {
  margin: 0 0 10px;
  font-size: clamp(23px, 4.6vw, 40px);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--platinum);
}

.page-about .about-sec__sub {
  margin: 0;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */

.page-about .about-figure {
  margin: 0 0 clamp(24px, 4vw, 38px);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--gold-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .05em;
  color: var(--mist);
}

.page-about .about-tl {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 22px;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold-line), rgba(107, 83, 16, .35) 70%, transparent);
}

.page-about .about-tl__item {
  position: relative;
  display: grid;
  grid-template-columns: 50px minmax(0, 1fr);
  gap: 12px;
  padding-bottom: 26px;
}

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

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 7px;
  width: 10px;
  height: 10px;
  transform: rotate(45deg);
  background: var(--lava-deep);
  border: 1px solid var(--gold-line);
}

.page-about .about-tl__item.is-current::before {
  background: var(--lava);
  border-color: var(--lava);
  animation: about-pulse 2.6s var(--ease) infinite;
}

@keyframes about-pulse {
  0% { box-shadow: 0 0 0 0 rgba(255, 107, 53, .5); }
  70% { box-shadow: 0 0 0 12px rgba(255, 107, 53, 0); }
  100% { box-shadow: 0 0 0 0 rgba(255, 107, 53, 0); }
}

.page-about .about-tl__year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--gold);
  padding-top: 2px;
}

.page-about .about-tl__item.is-current .about-tl__year {
  color: var(--lava);
}

.page-about .about-tl__title {
  margin: 0;
  font-size: 16.5px;
  font-weight: 800;
  line-height: 1.45;
  color: var(--platinum);
}

.page-about .about-tl__body p {
  margin: 7px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 服务范围 ---------- */

.page-about .about-range__figure {
  margin: 0 0 18px;
  overflow: hidden;
  border: 1px solid var(--gold-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .about-range__figure img {
  display: block;
  width: 100%;
  height: clamp(130px, 20vw, 230px);
  object-fit: cover;
}

.page-about .about-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-bottom: 14px;
  font-size: 12px;
  color: var(--mist);
}

.page-about .about-legend__item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.page-about .about-range__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(116px, 1fr));
  gap: 6px;
}

.page-about .prov {
  background: var(--ink-2);
  border: 1px solid var(--about-line);
  transition: transform .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}

.page-about .prov:hover {
  transform: translateY(-2px);
  border-color: var(--jade);
}

.page-about .prov[open] {
  grid-column: 1 / -1;
  border-color: var(--jade);
  background: var(--ink-3);
}

.page-about .prov__sum {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 9px 11px;
  cursor: pointer;
  list-style: none;
  font-size: 13px;
  line-height: 1.5;
  color: var(--platinum);
}

.page-about .prov__sum::-webkit-details-marker {
  display: none;
}

.page-about .prov__sum:focus-visible {
  outline: 2px solid var(--jade-soft);
  outline-offset: -2px;
}

.page-about .prov__dot {
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
}

.page-about .prov__dot--main {
  background: var(--lava);
  box-shadow: 0 0 0 3px rgba(255, 107, 53, .2);
}

.page-about .prov__dot--node {
  background: var(--jade);
}

.page-about .prov__dot--near {
  background: var(--mist);
  opacity: .55;
}

.page-about .prov__body {
  padding: 0 11px 12px;
}

.page-about .prov__body p {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-range__foot {
  margin: 20px 0 0;
  padding: 14px 16px;
  border-left: 3px solid var(--jade);
  background: rgba(46, 196, 182, .07);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 节点与节奏 ---------- */

.page-about .about-ops {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .about-ops__main p {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-ops__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-ops__list li {
  position: relative;
  padding: 12px 0 12px 18px;
  border-top: 1px solid var(--about-line-soft);
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-ops__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 19px;
  width: 7px;
  height: 7px;
  transform: rotate(45deg);
  background: var(--gold);
}

.page-about .about-ops__list strong {
  display: block;
  margin-bottom: 3px;
  color: var(--platinum);
  font-weight: 800;
}

.page-about .about-ops__img {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--gold-line);
  align-self: start;
}

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

.page-about .about-cadence {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-cadence li {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 6px 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-cadence__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--gold);
  padding-top: 2px;
}

.page-about .about-cadence__v {
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-ops__note {
  margin: 20px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .about-team__main p {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-team__stats {
  margin: 0;
  border: 1px solid var(--gold-line);
  border-top: 3px solid var(--jade);
  background: var(--ink-2);
  align-self: start;
}

.page-about .about-team__stat {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 11px 14px;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-team__stat:last-child {
  border-bottom: 0;
}

.page-about .about-team__stat dt {
  font-size: 12.5px;
  color: var(--mist);
}

.page-about .about-team__stat dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--jade-soft);
  white-space: nowrap;
}

/* ---------- 运营信息 ---------- */

.page-about .about-legal {
  margin: 0;
  padding: clamp(16px, 3vw, 26px);
  border: 3px solid var(--gold-line);
  background: var(--ink-2);
}

.page-about .about-legal__row {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px dashed rgba(212, 160, 23, .24);
}

.page-about .about-legal__row:last-child {
  border-bottom: 0;
}

.page-about .about-legal__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
  padding-top: 2px;
}

.page-about .about-legal__v {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: .01em;
  color: var(--gold);
  word-break: break-word;
  overflow-wrap: anywhere;
}

.page-about .about-legal__note {
  margin: 16px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 合作 ---------- */

.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .about-partners__main p {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-partners__side {
  padding: 20px;
  border: 1px solid var(--gold-line);
  border-left: 4px solid var(--lava);
  background:
    linear-gradient(135deg, rgba(255, 107, 53, .1), transparent 62%),
    var(--ink-2);
}

.page-about .about-partners__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(40px, 10vw, 58px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--lava);
}

.page-about .about-partners__num span {
  font-size: .5em;
  color: var(--gold);
}

.page-about .about-partners__cap {
  margin: 8px 0 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-partners__cta {
  display: inline-block;
}

.page-about .about-next {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-next li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 3px;
  padding: 14px 0 14px 16px;
  border-bottom: 1px solid var(--about-line-soft);
  position: relative;
}

.page-about .about-next li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  width: 6px;
  height: 6px;
  transform: rotate(45deg);
  background: var(--jade);
}

.page-about .about-next a {
  font-size: 15px;
  font-weight: 700;
  color: var(--platinum);
}

.page-about .about-next span {
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 断点 ---------- */

@media (min-width: 640px) {
  .page-about .about-next {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-bottom: 1px solid var(--about-line);
  }

  .page-about .about-next li {
    border-bottom: 0;
    border-right: 1px solid var(--about-line-soft);
    padding: 16px 16px 16px 18px;
  }

  .page-about .about-next li:last-child {
    border-right: 0;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-tl__item {
    grid-template-columns: 66px minmax(0, 1fr);
    gap: 16px;
    padding-bottom: 30px;
  }

  .page-about .about-tl__year {
    font-size: 14px;
  }

  .page-about .about-tl__title {
    font-size: 18px;
  }

  .page-about .about-team,
  .page-about .about-ops {
    grid-template-columns: minmax(0, 1fr) minmax(0, 300px);
    gap: clamp(24px, 4vw, 44px);
  }

  .page-about .about-partners {
    grid-template-columns: minmax(0, 1fr) minmax(0, 300px);
    gap: clamp(24px, 4vw, 44px);
    align-items: start;
  }

  .page-about .about-range__grid {
    grid-template-columns: repeat(auto-fill, minmax(132px, 1fr));
    gap: 8px;
  }

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

  .page-about .about-cadence li {
    grid-template-columns: 116px minmax(0, 1fr);
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero {
    padding-top: clamp(32px, 4vw, 52px);
  }

  .page-about .about-tl {
    padding-left: 30px;
  }

  .page-about .about-tl::before {
    left: 5px;
  }

  .page-about .about-tl__item::before {
    left: -30px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__item.is-current::before {
    animation: none;
  }

  .page-about .prov,
  .page-about .about-jump__link {
    transition: none;
  }

  .page-about .prov:hover {
    transform: none;
  }
}