.page-about {
  --about-axis-x: 20px;
  --about-node-gap: clamp(36px, 5.5vw, 64px);
  background: var(--paper);
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .page-about__hero {
  padding: clamp(26px, 4.5vw, 52px) 0 clamp(48px, 7vw, 96px);
  background:
    radial-gradient(120% 90% at 92% 4%, rgba(45, 99, 245, 0.11), transparent 52%),
    radial-gradient(70% 60% at 4% 96%, rgba(233, 178, 60, 0.10), transparent 60%),
    var(--paper);
}

.page-about .crumbs {
  margin-bottom: clamp(22px, 3.6vw, 40px);
}

.page-about .about-hero {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
  align-items: start;
}

.page-about .about-hero__lead .h-display {
  margin: 14px 0 0;
  max-width: 18ch;
}

.page-about .about-hero__lead .lede {
  margin-top: clamp(16px, 2.4vw, 24px);
  max-width: 46ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.4vw, 36px);
}

.page-about .about-hero__aside {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 3.6vw, 36px);
  background: var(--ink);
  border: 1px solid var(--line-dark-2);
  border-radius: 3px;
  box-shadow: var(--sh-2);
}

.page-about .about-hero__aside::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 68px;
  height: 68px;
  border-top: 1px solid var(--gold);
  border-right: 1px solid var(--gold);
  opacity: 0.6;
  pointer-events: none;
}

.page-about .about-orb {
  position: relative;
  width: min(210px, 58vw);
  aspect-ratio: 1 / 1;
  margin: 0 auto clamp(22px, 3vw, 30px);
}

.page-about .about-orb__ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(233, 178, 60, 0.22);
}

.page-about .about-orb__ring:nth-child(1) {
  inset: 0;
}

.page-about .about-orb__ring:nth-child(2) {
  inset: 17%;
  border-color: rgba(45, 99, 245, 0.42);
}

.page-about .about-orb__ring:nth-child(3) {
  inset: 33%;
  border-color: rgba(233, 178, 60, 0.48);
}

.page-about .about-orb__core {
  position: absolute;
  inset: 45%;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 6px rgba(233, 178, 60, 0.14), 0 0 26px rgba(233, 178, 60, 0.48);
  animation: about-core 2.4s var(--ease) infinite;
}

@keyframes about-core {
  0%,
  100% {
    box-shadow: 0 0 0 6px rgba(233, 178, 60, 0.14), 0 0 22px rgba(233, 178, 60, 0.4);
  }
  50% {
    box-shadow: 0 0 0 13px rgba(233, 178, 60, 0.06), 0 0 36px rgba(233, 178, 60, 0.62);
  }
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding-top: 20px;
  border-top: 1px solid var(--line-dark);
}

.page-about .about-hero__stats dt {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--on-dark-faint);
}

.page-about .about-hero__stats dd {
  margin: 8px 0 0;
  font-size: clamp(19px, 2.6vw, 25px);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--on-dark);
  font-variant-numeric: tabular-nums;
}

@media (min-width: 980px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

/* ---------- 区块标题 ---------- */
.page-about .about-head {
  max-width: 62ch;
  margin-bottom: clamp(30px, 4.6vw, 52px);
}

.page-about .about-head .h-section {
  margin: 12px 0 0;
}

.page-about .about-head .prose,
.page-about .about-head .lede {
  margin-top: 14px;
}

/* ---------- 沿革时间线 ---------- */
.page-about .about-ledger-figure {
  margin: 0 0 clamp(38px, 5.6vw, 68px);
}

.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: var(--about-node-gap);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: var(--about-axis-x);
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, var(--volt) 0%, #6B62B4 46%, var(--gold) 100%);
}

.page-about .about-node {
  position: relative;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  row-gap: 0;
}

.page-about .about-node__dot {
  position: absolute;
  left: var(--about-axis-x);
  top: 7px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  transform: translateX(-50%);
  background: var(--gold);
  box-shadow: 0 0 0 4px var(--paper), 0 0 0 5px var(--rule);
  transition: box-shadow var(--t) var(--ease), background var(--t) var(--ease);
}

.page-about .about-node:hover .about-node__dot,
.page-about .about-node:focus-within .about-node__dot {
  background: var(--gold-hi);
  box-shadow: 0 0 0 4px var(--paper), 0 0 0 5px var(--gold);
}

.page-about .about-node__main {
  grid-column: 2;
  grid-row: 1;
  min-width: 0;
}

.page-about .about-node__stamp {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--volt-deep);
}

.page-about .about-node__main .h-card {
  margin: 10px 0 0;
}

.page-about .about-node__main .prose,
.page-about .about-node__main > p:last-child {
  margin-top: 12px;
  max-width: 58ch;
}

.page-about .about-node__note {
  grid-column: 2;
  grid-row: 2;
  margin-top: 18px;
  max-width: 40ch;
}

.page-about .about-node__note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mute);
}

@media (min-width: 900px) {
  .page-about {
    --about-axis-x: 36px;
  }

  .page-about .about-node {
    grid-template-columns: 72px minmax(0, 1fr) 260px;
    column-gap: 34px;
  }

  .page-about .about-node__main {
    grid-column: 2;
  }

  .page-about .about-node__note {
    grid-column: 3;
    grid-row: 1;
    margin-top: 34px;
    max-width: none;
    opacity: 0.5;
    transform: translateX(6px);
    transition: opacity var(--t-slow) var(--ease), transform var(--t-slow) var(--ease);
  }

  .page-about .about-node:hover .about-node__note,
  .page-about .about-node:focus-within .about-node__note {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 服务主线 ---------- */
.page-about .page-about__lines {
  background:
    radial-gradient(90% 70% at 8% 0%, rgba(45, 99, 245, 0.16), transparent 58%),
    var(--ink);
}

.page-about .about-lines {
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
}

.page-about .about-line {
  position: relative;
  padding: clamp(24px, 3.2vw, 32px) clamp(20px, 2.6vw, 28px) clamp(20px, 2.6vw, 26px);
  background: var(--ink-2);
  border: 1px solid var(--line-dark);
  border-radius: 3px;
  color: var(--on-dark);
  transition: border-color var(--t) var(--ease), transform var(--t) var(--ease), box-shadow var(--t) var(--ease);
}

.page-about .about-line::after {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 18px;
  height: 18px;
  background: var(--ink);
  border-left: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
  border-bottom-left-radius: 3px;
  transition: border-color var(--t) var(--ease);
}

.page-about .about-line:hover,
.page-about .about-line:focus-within {
  border-color: var(--gold);
  transform: translateY(-2px);
  box-shadow: var(--sh-2);
}

.page-about .about-line:hover::after,
.page-about .about-line:focus-within::after {
  border-color: var(--gold);
}

.page-about .about-line__idx {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .about-line .h-card {
  margin: 12px 0 0;
}

.page-about .about-line p {
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--on-dark-soft);
}

.page-about .about-line__who {
  padding-top: 14px;
  border-top: 1px solid var(--line-dark);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--on-dark-faint);
}

.page-about .about-lines-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-top: clamp(28px, 4vw, 44px);
  padding-top: clamp(22px, 3vw, 32px);
  border-top: 1px solid var(--line-dark);
}

.page-about .about-lines-foot .text-soft {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--on-dark-soft);
}

@media (min-width: 880px) {
  .page-about .about-lines {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 支持团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(32px, 5vw, 56px);
  align-items: start;
}

.page-about .about-team__body .h-section {
  margin: 12px 0 0;
}

.page-about .about-team__body .prose {
  margin-top: 16px;
}

.page-about .about-queue {
  display: grid;
  gap: 0;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--rule);
}

.page-about .about-queue li {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-queue__tag {
  grid-row: 1 / span 2;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--volt-deep);
  padding-top: 2px;
}

.page-about .about-queue strong {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-queue span:not(.about-queue__tag) {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mute);
}

.page-about .about-team__sla {
  margin-top: clamp(22px, 3vw, 32px);
  padding: 18px 20px;
  font-size: 15px;
  line-height: 1.8;
  background: rgba(233, 178, 60, 0.09);
  border-left: 2px solid var(--gold);
  border-radius: 0 3px 3px 0;
}

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

@media (min-width: 940px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 380px);
  }
}

/* ---------- 协作区 ---------- */
.page-about .about-zones {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-zone {
  position: relative;
  overflow: hidden;
  padding: 22px 20px 24px;
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 3px;
  transition: border-color var(--t) var(--ease), transform var(--t) var(--ease), box-shadow var(--t) var(--ease);
}

.page-about .about-zone::before {
  content: "";
  position: absolute;
  inset: 0 0 46% 0;
  background-image: radial-gradient(circle, rgba(226, 220, 206, 0.95) 1px, transparent 1px);
  background-size: 14px 14px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 100%);
  pointer-events: none;
}

.page-about .about-zone:hover,
.page-about .about-zone:focus-within {
  border-color: var(--gold);
  transform: translateY(-2px);
  box-shadow: var(--sh-1);
}

.page-about .about-zone__code {
  position: relative;
  display: inline-block;
  padding-bottom: 2px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mute);
  border-bottom: 1px solid var(--volt);
}

.page-about .about-zone__name {
  position: relative;
  margin: 16px 0 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
  transition: color var(--t) var(--ease);
}

.page-about .about-zone:hover .about-zone__name,
.page-about .about-zone:focus-within .about-zone__name {
  color: var(--gold-deep);
}

.page-about .about-zone p {
  position: relative;
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mute);
}

@media (min-width: 700px) {
  .page-about .about-zones {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1060px) {
  .page-about .about-zones {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-zone:nth-child(2) {
    transform: translateY(16px);
  }

  .page-about .about-zone:nth-child(4) {
    transform: translateY(16px);
  }

  .page-about .about-zone:nth-child(2):hover,
  .page-about .about-zone:nth-child(4):hover {
    transform: translateY(14px);
  }
}

/* ---------- 登记信息 ---------- */
.page-about .page-about__registry {
  background:
    radial-gradient(80% 70% at 88% 96%, rgba(233, 178, 60, 0.14), transparent 60%),
    var(--ink-2);
}

.page-about .about-registry {
  display: grid;
  gap: clamp(30px, 4.6vw, 56px);
  align-items: start;
}

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

.page-about .about-registry__body .h-section {
  margin: 12px 0 0;
}

.page-about .about-registry__body .prose {
  margin-top: 16px;
  max-width: 54ch;
}

.page-about .about-registry__list {
  margin: clamp(24px, 3.4vw, 34px) 0 0;
  border-top: 1px solid var(--line-dark);
}

.page-about .about-registry__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-registry__row dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--on-dark-faint);
}

.page-about .about-registry__row dd {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--on-dark);
  overflow-wrap: anywhere;
}

.page-about .about-icp {
  display: inline-block;
  padding: 3px 10px;
  color: var(--gold);
  background: rgba(233, 178, 60, 0.10);
  border: 1px solid rgba(233, 178, 60, 0.45);
  border-radius: 3px;
  user-select: all;
  -webkit-user-select: all;
  cursor: text;
  transition: background var(--t) var(--ease), border-color var(--t) var(--ease);
}

.page-about .about-icp:hover,
.page-about .about-icp:focus-visible {
  background: rgba(233, 178, 60, 0.2);
  border-color: var(--gold);
}

.page-about .about-icp:active {
  background: var(--gold);
  color: var(--ink);
}

.page-about .about-registry__note {
  margin-top: 18px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--on-dark-soft);
}

.page-about .about-registry__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 30px);
}

@media (min-width: 720px) {
  .page-about .about-registry__row {
    grid-template-columns: minmax(96px, 130px) minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }
}

@media (min-width: 940px) {
  .page-about .about-registry {
    grid-template-columns: minmax(0, 360px) minmax(0, 1fr);
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-orb__core {
    animation: none;
  }

  .page-about .about-line:hover,
  .page-about .about-zone:hover,
  .page-about .about-node:hover .about-node__note {
    transform: none;
  }
}