.page-about {
  --ab-rail: rgba(44, 229, 210, .38);
  --ab-hair: rgba(29, 58, 99, .9);
  --ab-soft: rgba(18, 41, 74, .74);
  padding-bottom: clamp(56px, 9vw, 110px);
  overflow-x: hidden;
}

/* ---------- 首屏框景窗口 ---------- */
.page-about .ab-hero {
  padding: clamp(20px, 4vw, 34px) var(--xy-gutter) 0;
}

.page-about .ab-window {
  position: relative;
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(30px, 6vw, 64px);
  border: 1px solid var(--xy-rule);
  border-radius: var(--xy-r-l);
  background:
    radial-gradient(circle at 88% 6%, rgba(44, 229, 210, .16), transparent 54%),
    radial-gradient(circle at 2% 98%, rgba(255, 107, 69, .11), transparent 46%),
    linear-gradient(158deg, #10274A 0%, var(--xy-ink) 60%);
  box-shadow: var(--xy-shadow-card);
  overflow: hidden;
}

.page-about .ab-window::before,
.page-about .ab-window::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 7px;
  background-image: repeating-linear-gradient(
    to right,
    rgba(44, 229, 210, .48) 0 1px,
    transparent 1px 22px
  );
  opacity: .75;
  pointer-events: none;
}

.page-about .ab-window::before { top: 0; }
.page-about .ab-window::after { bottom: 0; }

.page-about .ab-window__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 18px;
  padding-bottom: 14px;
  margin-bottom: clamp(20px, 3vw, 30px);
  border-bottom: 1px solid var(--xy-rule);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--xy-mist);
}

.page-about .ab-window__ver {
  color: var(--xy-gold);
}

.page-about .xy-crumbs {
  margin-bottom: 20px;
  font-size: 13px;
}

.page-about .ab-sep {
  padding: 0 .35em;
  color: var(--xy-rule);
}

.page-about .ab-window .xy-h1 {
  margin: 6px 0 0;
  max-width: 15em;
}

.page-about .ab-window .xy-lead {
  margin-top: 22px;
  max-width: 44em;
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-band {
  padding: clamp(52px, 9vw, 104px) var(--xy-gutter);
}

.page-about .ab-band--wide > * {
  max-width: 1180px;
  margin-left: auto;
  margin-right: auto;
}

.page-about .ab-band--narrow > * {
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

.page-about .ab-head {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 0 16px;
  margin-bottom: clamp(28px, 5vw, 48px);
}

.page-about .ab-head__idx {
  display: block;
  grid-column: 1;
  grid-row: 1;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--xy-cyan);
  padding-top: .95em;
}

.page-about .ab-head .xy-h2 {
  grid-column: 2;
  grid-row: 1;
  margin: 0;
}

.page-about .ab-head__note {
  grid-column: 2;
  grid-row: 2;
  margin: .8em 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--xy-mist);
}

/* ---------- 01 五大板块 ---------- */
.page-about .ab-blocks {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .ab-block {
  position: relative;
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid rgba(44, 229, 210, .18);
  background: linear-gradient(152deg, var(--xy-indigo) 0%, #0C1F38 100%);
  overflow: hidden;
  transition: transform .3s var(--xy-ease), border-color .3s var(--xy-ease);
}

.page-about .ab-block::after {
  content: "";
  position: absolute;
  right: -46px;
  top: -46px;
  width: 150px;
  height: 150px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(44, 229, 210, .2), transparent 68%);
  pointer-events: none;
}

.page-about .ab-block:nth-child(1) { border-radius: 36px 20px 26px 22px; }
.page-about .ab-block:nth-child(2) { border-radius: 20px 36px 22px 30px; }
.page-about .ab-block:nth-child(3) { border-radius: 30px 22px 36px 20px; }
.page-about .ab-block:nth-child(4) { border-radius: 22px 30px 20px 36px; }
.page-about .ab-block:nth-child(5) { border-radius: 34px 24px 24px 34px; }

.page-about .ab-block--cyan { border-color: rgba(44, 229, 210, .3); }
.page-about .ab-block--gold { border-color: rgba(247, 183, 51, .3); }
.page-about .ab-block--coral { border-color: rgba(255, 107, 69, .3); }

.page-about .ab-block--gold::after {
  background: radial-gradient(circle, rgba(247, 183, 51, .2), transparent 68%);
}

.page-about .ab-block--coral::after {
  background: radial-gradient(circle, rgba(255, 107, 69, .2), transparent 68%);
}

.page-about .ab-block__title {
  position: relative;
  margin: 0 0 12px;
  font-size: clamp(1.15rem, 3.4vw, 1.4rem);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--xy-white);
}

.page-about .ab-block p {
  position: relative;
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(234, 241, 248, .84);
}

.page-about .ab-block__when {
  position: relative;
  display: inline-block;
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--xy-mist);
  padding: 4px 0 0;
  border-top: 1px solid var(--xy-rule);
}

/* ---------- 02 版本演进 ---------- */
.page-about .ab-figure {
  margin: 0 0 clamp(32px, 5vw, 52px);
}

.page-about .ab-figure img,
.page-about .ab-reach__figure img,
.page-about .ab-team__figure img,
.page-about .ab-resource__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--xy-r-m);
  object-fit: cover;
  border: 1px solid var(--xy-rule);
}

.page-about .ab-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 34px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 8px;
  bottom: 8px;
  width: 3px;
  border-radius: 999px;
  background: linear-gradient(to bottom, var(--xy-cyan), var(--xy-gold) 55%, var(--xy-coral));
  opacity: .8;
}

.page-about .ab-node {
  position: relative;
  padding-bottom: clamp(26px, 4vw, 42px);
}

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

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 7px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--xy-gold);
  box-shadow: 0 0 0 5px rgba(247, 183, 51, .16);
}

.page-about .ab-node__ver {
  display: inline-block;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--xy-gold);
  padding: 4px 11px;
  border: 1px solid rgba(247, 183, 51, .34);
  border-radius: var(--xy-pill);
  margin-bottom: 12px;
}

.page-about .ab-node__title {
  margin: 0 0 8px;
  font-size: clamp(1.05rem, 3.2vw, 1.28rem);
  font-weight: 700;
  line-height: 1.5;
  color: var(--xy-white);
}

.page-about .ab-node p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(234, 241, 248, .78);
}

/* ---------- 03 覆盖与团队 ---------- */
.page-about .ab-reach {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 38px);
  align-items: start;
  margin-bottom: clamp(40px, 6vw, 72px);
}

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .ab-stat {
  padding: 18px 16px 20px;
  border-radius: var(--xy-r-m);
  background: var(--ab-soft);
  border: 1px solid var(--xy-rule);
}

.page-about .ab-num {
  display: block;
  font-family: var(--xy-mono);
  font-size: clamp(1.7rem, 7vw, 3rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -.04em;
  color: var(--xy-cyan);
  margin-bottom: 12px;
  word-break: keep-all;
}

.page-about .ab-stat__label {
  display: block;
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--xy-mist);
}

.page-about .ab-reach__figure {
  margin: 0;
}

.page-about .ab-reach__figure img {
  border-radius: var(--xy-r-l);
}

.page-about .ab-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 36px);
  align-items: center;
}

.page-about .ab-team__body .xy-h3 {
  margin: 0 0 14px;
  color: var(--xy-white);
}

.page-about .ab-team__body p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(234, 241, 248, .8);
}

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

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

.page-about .xy-figure__cap {
  display: block;
  margin-top: 10px;
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--xy-mist);
}

/* ---------- 04 资源规模 ---------- */
.page-about .ab-resource {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
}

.page-about .ab-resource__figure {
  margin: 0;
}

.page-about .ab-resource__figure img {
  border-radius: 40px 20px 40px 20px;
}

.page-about .ab-resource__body .ab-head__idx {
  padding-top: 0;
  margin-bottom: 10px;
}

.page-about .ab-resource__body .xy-h2 {
  margin: 0 0 16px;
}

.page-about .ab-resource__body > p {
  margin: 0 0 24px;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(234, 241, 248, .8);
}

.page-about .ab-dims {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-dims li {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  border-left: 3px solid var(--xy-cyan);
  border-radius: 0 var(--xy-r-s) var(--xy-r-s) 0;
  background: rgba(18, 41, 74, .6);
}

.page-about .ab-dims li:nth-child(2) { border-left-color: var(--xy-gold); }
.page-about .ab-dims li:nth-child(3) { border-left-color: var(--xy-coral); }

.page-about .ab-dims strong {
  font-size: 14px;
  color: var(--xy-white);
  letter-spacing: .02em;
}

.page-about .ab-dims span {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--xy-mist);
}

/* ---------- 05 合作生态 ---------- */
.page-about .ab-partners {
  list-style: none;
  margin: 0 0 clamp(26px, 4vw, 40px);
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-partner {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding: 20px 18px;
  border-radius: var(--xy-r-m);
  background: linear-gradient(140deg, rgba(18, 41, 74, .82), rgba(10, 26, 47, .6));
  border: 1px solid var(--xy-rule);
}

.page-about .ab-partner__num {
  font-size: 15px;
  letter-spacing: -.01em;
  color: var(--xy-gold);
}

.page-about .ab-partner p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(234, 241, 248, .82);
}

.page-about .ab-callout {
  margin: 0;
  padding: 16px 18px;
  border-radius: var(--xy-r-m);
  border: 1px dashed rgba(44, 229, 210, .38);
  font-size: 14px;
  line-height: 1.85;
  color: var(--xy-mist);
}

.page-about .ab-callout a {
  color: var(--xy-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 06 联系 ---------- */
.page-about .ab-contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
  padding: clamp(26px, 5vw, 52px);
  border-radius: var(--xy-r-l);
  border: 1px solid var(--xy-rule);
  background:
    radial-gradient(circle at 94% 4%, rgba(247, 183, 51, .16), transparent 52%),
    linear-gradient(160deg, #10274A 0%, var(--xy-ink) 70%);
}

.page-about .ab-contact__main .ab-head__idx {
  padding-top: 0;
  margin-bottom: 10px;
}

.page-about .ab-contact__main .xy-h2 {
  margin: 0 0 16px;
}

.page-about .ab-contact__main p {
  margin: 0 0 26px;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(234, 241, 248, .82);
  max-width: 40em;
}

.page-about .ab-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-contact__panel {
  padding: 22px 20px;
  border-radius: var(--xy-r-m);
  background: rgba(6, 16, 31, .55);
  border: 1px solid var(--xy-rule);
}

.page-about .ab-contact__k {
  margin: 0 0 4px;
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--xy-mist);
}

.page-about .ab-contact__v {
  margin: 0 0 16px;
  font-size: 15px;
  color: var(--xy-white);
  word-break: break-all;
}

.page-about .ab-contact__v:last-of-type {
  margin-bottom: 0;
}

.page-about .ab-contact__note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--xy-rule);
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--xy-mist);
}

/* ---------- 响应式 ---------- */
@media (max-width: 560px) {
  .page-about .ab-head {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .ab-head__idx {
    grid-column: 1;
    grid-row: 1;
    padding-top: 0;
    margin-bottom: 8px;
  }

  .page-about .ab-head .xy-h2 {
    grid-column: 1;
    grid-row: 2;
  }

  .page-about .ab-head__note {
    grid-column: 1;
    grid-row: 3;
  }

  .page-about .ab-partner {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }
}

@media (min-width: 760px) {
  .page-about .ab-blocks {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .ab-block:nth-child(1) { grid-column: span 4; }
  .page-about .ab-block:nth-child(2) { grid-column: span 2; }
  .page-about .ab-block:nth-child(3) { grid-column: span 3; }
  .page-about .ab-block:nth-child(4) { grid-column: span 3; }
  .page-about .ab-block:nth-child(5) { grid-column: span 6; }

  .page-about .ab-block:hover {
    transform: translateY(-3px);
  }
}

@media (min-width: 860px) {
  .page-about .ab-reach {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  }

  .page-about .ab-resource {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  }

  .page-about .ab-contact {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-block {
    transition: none;
  }

  .page-about .ab-block:hover {
    transform: none;
  }
}