/* ===== 品牌介绍 · page-about 作用域 ===== */
.page-about{
  --ab-hair: rgba(201,210,222,.20);
  --ab-hair-strong: rgba(201,210,222,.36);
  --ab-panel: #0C142B;
  --ab-panel-2: #131E3E;
  --ab-paper-ink: #0C1424;
  background: var(--night-ink);
  color: var(--silver-paper);
}

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

/* ---------- 首屏封面 ---------- */
.page-about .ab-hero{
  position: relative;
  padding: clamp(20px, 4vw, 40px) 0 clamp(44px, 6.5vw, 78px);
  background:
    radial-gradient(112% 84% at 8% -12%, rgba(91,75,224,.34), transparent 58%),
    radial-gradient(78% 62% at 94% 4%, rgba(47,224,198,.13), transparent 62%),
    var(--night-ink);
  overflow: hidden;
}
.page-about .ab-hero::before{
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(180deg, rgba(237,241,246,.028) 0 1px, transparent 1px 5px);
  pointer-events: none;
}
.page-about .crumb{ margin-bottom: clamp(20px, 3vw, 32px); }

.page-about .ab-hero__grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  align-items: start;
}
.page-about .ab-hero__lead h1{
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(30px, 7.4vw, 58px);
  line-height: 1.06;
  letter-spacing: -.02em;
  margin: 12px 0 0;
  color: #fff;
  max-width: 15ch;
}
.page-about .ab-hero__lead .lede{
  margin-top: 18px;
  font-size: clamp(15.5px, 2.4vw, 17.5px);
  line-height: 1.8;
  color: var(--silver-mist);
  max-width: 62ch;
}
.page-about .ab-hero__actions{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* 档案登记牌 */
.page-about .ab-plate{
  position: relative;
  background: linear-gradient(162deg, rgba(34,49,95,.92), rgba(12,20,43,.94));
  border: 1px solid var(--ab-hair-strong);
  padding: 22px 20px 20px;
  box-shadow: 0 20px 44px rgba(0,0,0,.46);
  transform: rotate(-.7deg);
}
.page-about .ab-plate::after{
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px solid rgba(201,210,222,.12);
  pointer-events: none;
}
.page-about .ab-plate__tab{
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--signal-amber);
  margin: 0 0 16px;
}
.page-about .ab-plate__list{ margin: 0; padding: 0; }
.page-about .ab-plate__row{
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--ab-hair);
}
.page-about .ab-plate__row:last-child{ border-bottom: 0; }
.page-about .ab-plate__row dt{
  font-size: 14px;
  color: var(--steel-gray);
}
.page-about .ab-plate__row dd{
  margin: 0;
  font-size: 16px;
  color: #fff;
  font-variant-numeric: tabular-nums;
}
.page-about .ab-plate__note{
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--silver-mist);
  padding-top: 14px;
  border-top: 1px solid var(--ab-hair);
}

/* 数据块 */
.page-about .ab-stats{
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 12px;
  margin-top: clamp(30px, 5vw, 54px);
}
.page-about .ab-stat{
  border: 1px solid var(--ab-hair);
  background: rgba(9,15,32,.6);
  padding: 16px 15px 14px;
}
.page-about .ab-stat__num{
  margin: 0;
  font-weight: 700;
  font-size: clamp(28px, 5.4vw, 42px);
  line-height: 1;
  color: #fff;
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
}
.page-about .ab-stat__unit{
  font-size: .42em;
  color: var(--neon-cyan);
  margin-left: .28em;
  letter-spacing: .06em;
}
.page-about .ab-stat__label{
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.55;
  color: var(--steel-gray);
}

/* ---------- 章节标题组 ---------- */
.page-about .ab-sechead{ max-width: 76ch; }
.page-about .ab-sechead h2{
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(24px, 4.6vw, 40px);
  line-height: 1.14;
  letter-spacing: -.02em;
  margin: 12px 0 0;
  color: #fff;
}
.page-about .ab-sechead--dark h2{ color: var(--ab-paper-ink); }
.page-about .ab-sechead .lede{
  margin-top: 16px;
  font-size: clamp(15px, 2.3vw, 17px);
  line-height: 1.8;
  color: var(--silver-mist);
  max-width: 68ch;
}
.page-about .ab-sechead--dark .lede{ color: var(--paper-text); }

/* ---------- 五条产品线 ---------- */
.page-about .ab-scope{
  background: var(--night-ink);
  padding-top: clamp(44px, 6vw, 76px);
}
.page-about .ab-lines{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(215px, 1fr));
  gap: 14px;
  margin-top: clamp(28px, 4vw, 44px);
}
.page-about .ab-line{
  position: relative;
  border: 1px solid var(--ab-hair);
  background: linear-gradient(170deg, rgba(34,49,95,.5), rgba(9,15,32,.7));
  padding: 20px 18px 20px;
  transition: transform .16s var(--ease), border-color .16s var(--ease);
}
.page-about .ab-line:nth-child(even){ transform: translateY(14px) rotate(.6deg); }
.page-about .ab-line:hover{
  transform: translateY(-2px);
  border-color: var(--neon-cyan);
}
.page-about .ab-line:nth-child(even):hover{ transform: translateY(12px); }
.page-about .ab-line__code{
  display: inline-block;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--signal-amber);
  border: 1px solid var(--signal-amber);
  padding: 3px 8px;
}
.page-about .ab-line h3{
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: -.01em;
  margin: 14px 0 8px;
  color: #fff;
}
.page-about .ab-line p{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--silver-mist);
}
.page-about .ab-scope__foot{
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: clamp(46px, 6vw, 72px);
  padding-top: 26px;
  border-top: 1px solid var(--ab-hair);
}
.page-about .ab-sub{
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--neon-cyan);
  margin: 0 0 10px;
  font-weight: 500;
}
.page-about .ab-scope__col p{
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver-mist);
  max-width: 60ch;
}

/* ---------- 时间轴 ---------- */
.page-about .ab-track-sec{
  background:
    radial-gradient(90% 70% at 50% 0%, rgba(91,75,224,.22), transparent 60%),
    var(--indigo-deep);
  padding-top: clamp(46px, 6vw, 78px);
}
.page-about .ab-track{
  list-style: none;
  margin: clamp(30px, 4.5vw, 48px) 0 0;
  padding: 0 0 20px;
  display: flex;
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  align-items: flex-start;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}
.page-about .ab-track::-webkit-scrollbar{ height: 6px; }
.page-about .ab-track::-webkit-scrollbar-track{ background: rgba(201,210,222,.08); }
.page-about .ab-track::-webkit-scrollbar-thumb{ background: rgba(47,224,198,.45); }

.page-about .ab-node{
  flex: 0 0 80%;
  min-width: 248px;
  max-width: 340px;
  scroll-snap-align: start;
  position: relative;
  background: linear-gradient(172deg, rgba(34,49,95,.88), rgba(12,20,43,.92));
  border: 1px solid var(--ab-hair);
  padding: 20px 18px 18px;
}
.page-about .ab-node::before{
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--neon-cyan), transparent 70%);
}
.page-about .ab-node--now::before{
  background: linear-gradient(90deg, var(--arc-orange), transparent 70%);
}
.page-about .ab-node__dot{
  display: block;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 2px solid var(--neon-cyan);
  background: var(--night-ink);
  margin-bottom: 14px;
}
.page-about .ab-node--now .ab-node__dot{
  background: var(--arc-orange);
  border-color: var(--arc-orange);
  box-shadow: 0 0 0 5px rgba(255,138,61,.16);
}
.page-about .ab-node__year{
  margin: 0;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--signal-amber);
}
.page-about .ab-node__title{
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.3;
  margin: 10px 0 8px;
  color: #fff;
}
.page-about .ab-node__sum{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--silver-mist);
}
.page-about .ab-node__more{
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--ab-hair);
}
.page-about .ab-node__more summary{
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--neon-cyan);
}
.page-about .ab-node__more summary::-webkit-details-marker{ display: none; }
.page-about .ab-node__more summary::after{ content: " ＋"; }
.page-about .ab-node__more[open] summary::after{ content: " －"; }
.page-about .ab-node__more p{
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--silver-mist);
}
.page-about .ab-track__foot{
  margin: 18px 0 0;
}
.page-about .ab-link{
  color: var(--neon-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47,224,198,.4);
  padding-bottom: 2px;
  font-size: 13px;
  letter-spacing: .06em;
}
.page-about .ab-link:hover{ border-bottom-color: var(--neon-cyan); }

/* ---------- 研发与产线 ---------- */
.page-about .ab-build{
  background: var(--night-ink);
  padding-top: clamp(46px, 6vw, 78px);
}
.page-about .ab-build__grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: clamp(26px, 4vw, 42px);
}
.page-about .ab-build__text p{
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--silver-mist);
  max-width: 66ch;
}
.page-about .ab-facts{
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  border-top: 1px solid var(--ab-hair);
}
.page-about .ab-facts li{
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--ab-hair);
  font-size: 14.5px;
  color: var(--silver-mist);
}
.page-about .ab-facts .mono{
  color: var(--signal-amber);
  font-size: 15px;
  min-width: 58px;
  letter-spacing: .04em;
}
.page-about .ab-build__fig,
.page-about .ab-build__wide{
  margin: 0;
  border: 1px solid var(--ab-hair);
  background: var(--ab-panel);
  position: relative;
}
.page-about .ab-build__fig img,
.page-about .ab-build__wide img{
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ab-build__fig figcaption,
.page-about .ab-build__wide figcaption{
  padding: 10px 14px;
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--steel-gray);
  border-top: 1px solid var(--ab-hair);
  text-transform: uppercase;
}
.page-about .ab-build__wide{ margin-top: clamp(24px, 4vw, 40px); }
.page-about .ab-build__wide img{ aspect-ratio: 3 / 1; }

/* ---------- 交付流程（纸面区） ---------- */
.page-about .ab-flow-sec{
  background: var(--silver-paper);
  color: var(--ab-paper-ink);
  padding-top: clamp(46px, 6vw, 78px);
}
.page-about .ab-flow{
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}
.page-about .ab-flow__item{
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 16px;
  padding: 22px 0;
  border-top: 1px solid rgba(12,20,36,.16);
}
.page-about .ab-flow__item:last-child{ border-bottom: 1px solid rgba(12,20,36,.16); }
.page-about .ab-flow__idx{
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--arc-orange);
  padding-top: 4px;
}
.page-about .ab-flow__body h3{
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 19px;
  margin: 0 0 8px;
  color: var(--ab-paper-ink);
}
.page-about .ab-flow__body p{
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper-text);
  max-width: 68ch;
}
.page-about .ab-flow__meta{
  margin-top: 10px !important;
  font-size: 11.5px !important;
  letter-spacing: .08em;
  color: var(--steel-gray) !important;
}
.page-about .ab-flow__meta .ab-link{
  color: #1E49B8;
  border-bottom-color: rgba(30,73,184,.4);
}

/* ---------- 服务网络 ---------- */
.page-about .ab-net{
  background:
    radial-gradient(80% 60% at 20% 0%, rgba(47,224,198,.10), transparent 58%),
    var(--night-ink);
  padding-top: clamp(46px, 6vw, 78px);
}
.page-about .ab-net__grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: clamp(28px, 4vw, 44px);
}
.page-about .ab-net__map{
  margin: 0;
  border: 1px solid var(--ab-hair);
  background: rgba(12,20,43,.7);
  padding: 12px 12px 0;
}
.page-about .ab-map{
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}
.page-about .ab-map__label{
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .08em;
  fill: var(--silver-paper);
}
.page-about .ab-map__meta{
  font-family: var(--font-body);
  font-size: 12px;
  fill: var(--neon-cyan);
  opacity: 0;
  transition: opacity .2s var(--ease);
}
.page-about .ab-map__node:hover .ab-map__meta{ opacity: 1; }
.page-about .ab-net__map figcaption{
  padding: 12px 2px 14px;
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--steel-gray);
  border-top: 1px solid var(--ab-hair);
  margin-top: 8px;
}
.page-about .ab-net__text p{
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--silver-mist);
  max-width: 62ch;
}
.page-about .ab-net__list{
  margin: 22px 0 0;
  padding: 0;
  border-top: 1px solid var(--ab-hair);
}
.page-about .ab-net__list > div{
  padding: 14px 0;
  border-bottom: 1px solid var(--ab-hair);
}
.page-about .ab-net__list dt{
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--neon-cyan);
  margin-bottom: 6px;
}
.page-about .ab-net__list dd{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--silver-mist);
  max-width: 58ch;
}
.page-about .ab-net__fig{
  margin: clamp(26px, 4vw, 42px) 0 0;
  border: 1px solid var(--ab-hair);
  background: var(--ab-panel);
}
.page-about .ab-net__fig img{
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}
.page-about .ab-net__fig figcaption{
  padding: 10px 14px;
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--steel-gray);
  border-top: 1px solid var(--ab-hair);
  text-transform: uppercase;
}

/* ---------- 资质与协作 ---------- */
.page-about .ab-cred{
  background:
    radial-gradient(90% 70% at 80% 0%, rgba(91,75,224,.24), transparent 62%),
    var(--indigo-deep);
  padding-top: clamp(46px, 6vw, 78px);
}
.page-about .ab-cred__grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  margin-top: clamp(26px, 4vw, 42px);
}
.page-about .ab-badges{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}
.page-about .ab-badge{
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 14px;
  align-items: center;
  border: 1px solid var(--ab-hair-strong);
  background: rgba(9,15,32,.5);
  padding: 14px 16px;
  transition: border-color .16s var(--ease), transform .16s var(--ease);
}
.page-about .ab-badge:hover{
  border-color: var(--neon-cyan);
  transform: translateY(-2px);
}
.page-about .ab-badge__code{
  grid-row: 1 / 3;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--signal-amber);
  border: 1px solid var(--signal-amber);
  padding: 5px 9px;
  white-space: nowrap;
  align-self: center;
}
.page-about .ab-badge__name{
  font-size: 15px;
  color: #fff;
  line-height: 1.4;
}
.page-about .ab-badge__tip{
  font-size: 13px;
  line-height: 1.6;
  color: var(--steel-gray);
}
.page-about .ab-cred__note{
  margin: 16px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--silver-mist);
  padding-left: 14px;
  border-left: 2px solid var(--neon-cyan);
  max-width: 60ch;
}
.page-about .ab-eco{
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
.page-about .ab-eco__item{
  border: 1px solid var(--ab-hair);
  background: linear-gradient(168deg, rgba(34,49,95,.55), rgba(9,15,32,.65));
  padding: 18px;
}
.page-about .ab-eco__num{
  margin: 0 0 10px;
  font-size: clamp(22px, 4vw, 30px);
  font-weight: 700;
  color: var(--neon-cyan);
  letter-spacing: -.01em;
  font-variant-numeric: tabular-nums;
}
.page-about .ab-eco__desc{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--silver-mist);
}

.page-about .ab-cred__cta{
  margin-top: clamp(34px, 5vw, 56px);
  padding: 26px 22px;
  border: 1px solid var(--ab-hair-strong);
  background: linear-gradient(120deg, rgba(34,49,95,.75), rgba(12,20,43,.85));
  display: grid;
  gap: 18px;
}
.page-about .ab-cred__cta p{
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--silver-paper);
  max-width: 62ch;
}
.page-about .ab-cred__btns{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px){
  .page-about .ab-stats{ gap: 16px; }
  .page-about .ab-flow__item{ grid-template-columns: 64px 1fr; gap: 22px; padding: 26px 0; }
  .page-about .ab-eco{ grid-template-columns: repeat(3, minmax(0,1fr)); }
  .page-about .ab-badges{ grid-template-columns: 1fr; }
}

@media (min-width: 900px){
  .page-about .ab-hero__grid{
    grid-template-columns: minmax(0,7fr) minmax(0,4fr);
    gap: 48px;
    align-items: start;
  }
  .page-about .ab-plate{ margin-top: 14px; }
  .page-about .ab-stats{ grid-template-columns: repeat(4, minmax(0,1fr)); }
  .page-about .ab-scope__foot{ grid-template-columns: repeat(2, minmax(0,1fr)); gap: 40px; }
  .page-about .ab-node{ flex: 0 0 300px; }
  .page-about .ab-build__grid{ grid-template-columns: minmax(0,6fr) minmax(0,5fr); gap: 42px; align-items: start; }
  .page-about .ab-net__grid{ grid-template-columns: minmax(0,6fr) minmax(0,5fr); gap: 44px; align-items: start; }
  .page-about .ab-cred__grid{ grid-template-columns: minmax(0,5fr) minmax(0,6fr); gap: 48px; }
  .page-about .ab-flow{ grid-template-columns: repeat(2, minmax(0,1fr)); column-gap: 52px; }
  .page-about .ab-flow__item:nth-child(2){ border-top: 1px solid rgba(12,20,36,.16); }
  .page-about .ab-flow__item:nth-last-child(2){ border-bottom: 1px solid rgba(12,20,36,.16); }
  .page-about .ab-cred__cta{
    grid-template-columns: 1fr auto;
    align-items: center;
    padding: 28px 30px;
  }
}

@media (min-width: 1140px){
  .page-about .ab-build__fig img{ aspect-ratio: 3 / 2; }
}

@media (prefers-reduced-motion: reduce){
  .page-about .ab-line,
  .page-about .ab-badge{ transition: none; }
  .page-about .ab-line:nth-child(even){ transform: none; }
  .page-about .ab-line:nth-child(even):hover{ transform: none; }
  .page-about .ab-plate{ transform: none; }
  .page-about .ab-map__meta{ transition: none; }
}
<<<END>>>