.page-about{
  --ab-rail: clamp(150px, 16vw, 220px);
  --ab-sec-space: clamp(40px, 6vw, 78px);
  background: var(--ink-900);
  color: var(--star);
}

.page-about img{
  max-width: 100%;
  height: auto;
}

/* ---------- 顶部条 ---------- */
.page-about .ab-topbar{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 18px;
  padding-top: clamp(18px, 3vw, 30px);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-topbar__ver{
  margin: 0;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--dust-dim);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero{
  position: relative;
  padding: clamp(28px, 4.5vw, 60px) 0 clamp(36px, 5.5vw, 72px);
  border-bottom: 1px solid var(--line-soft);
  background:
    radial-gradient(900px 380px at 82% -20%, rgba(45, 226, 230, .10), transparent 70%),
    radial-gradient(620px 300px at 4% 108%, rgba(255, 106, 43, .08), transparent 70%);
}

.page-about .ab-hero__inner{
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .ab-hero h1{
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5vw, 54px);
  line-height: 1.12;
  letter-spacing: -.015em;
  max-width: 16em;
  overflow-wrap: break-word;
}

.page-about .ab-hero__lede{
  margin: clamp(16px, 2vw, 22px) 0 0;
  max-width: 34em;
  font-size: clamp(15.5px, 1.2vw, 17px);
  line-height: 1.85;
  color: var(--dust);
}

.page-about .ab-hero__meta{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  margin-top: clamp(18px, 2.4vw, 28px);
}

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

.page-about .ab-hero__figure .figure__frame img{
  display: block;
  width: 100%;
  object-fit: cover;
}

@media (min-width: 900px){
  .page-about .ab-hero__inner{
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: clamp(28px, 4.4vw, 64px);
    align-items: end;
  }
  .page-about .ab-hero__figure{
    transform: translateY(clamp(0px, 1.6vw, 20px));
  }
}

/* ---------- 通用章节骨架 ---------- */
.page-about .ab-sec{
  padding: var(--ab-sec-space) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-sec__head{
  display: grid;
  gap: 14px;
  margin-bottom: clamp(26px, 3.6vw, 46px);
}

.page-about .ab-sec__idx{
  display: block;
  font-size: 12.5px;
  letter-spacing: .16em;
  color: var(--flame);
  margin-bottom: 10px;
}

.page-about .ab-sec__title{
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.4vw, 38px);
  line-height: 1.2;
  letter-spacing: -.01em;
  max-width: 20em;
  overflow-wrap: break-word;
}

.page-about .ab-sec__title::before{
  content: "";
  display: block;
  width: 28px;
  height: 2px;
  margin-bottom: 12px;
  background: var(--grad);
}

.page-about .ab-sec__note{
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--line);
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--dust);
  max-width: 22em;
}

@media (max-width: 899px){
  .page-about .ab-sec__note{ order: 2; }
  .page-about .ab-sec__titles{ order: 1; }
}

@media (min-width: 900px){
  .page-about .ab-sec__head{
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    align-items: end;
    gap: clamp(24px, 4vw, 56px);
  }
}

.page-about .ab-sec__body{
  display: grid;
  gap: clamp(24px, 3.4vw, 40px);
}

@media (min-width: 900px){
  .page-about .ab-sec__body--rail{
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }
  .page-about .ab-sec__body--split{
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }
}

/* ---------- 正文 ---------- */
.page-about .ab-prose p{
  margin: 0 0 1.05em;
  font-size: clamp(15.5px, 1.15vw, 16.5px);
  line-height: 1.88;
  color: var(--dust);
  max-width: 36em;
}

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

/* ---------- 数字栏 ---------- */
.page-about .ab-stats{
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .ab-stat{
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  background: var(--ink-800);
}

.page-about .ab-stat__num{
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.1vw, 27px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--mint);
}

.page-about .ab-stat__label{
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--dust);
}

/* ---------- 时间线 ---------- */
.page-about .ab-tl{
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 34px;
  display: grid;
  gap: clamp(20px, 2.6vw, 32px);
}

.page-about .ab-tl::before{
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--flame), var(--cyan) 60%, var(--line));
}

.page-about .ab-tl__item{
  position: relative;
}

.page-about .ab-tl__item::before{
  content: "";
  position: absolute;
  left: -34px;
  top: 8px;
  width: 15px;
  height: 15px;
  border: 1px solid var(--line);
  background: var(--ink-900);
  transform: rotate(45deg);
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .ab-tl__item:hover::before,
.page-about .ab-tl__item:focus-within::before{
  border-color: var(--mint);
  box-shadow: 0 0 0 4px rgba(78, 240, 176, .12);
}

.page-about .ab-tl__item--now::before{
  border-color: var(--flame);
}

.page-about .ab-tl__stage{
  display: inline-block;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--mint);
  margin-bottom: 6px;
}

.page-about .ab-tl__item--now .ab-tl__stage{
  color: var(--flame);
}

.page-about .ab-tl__title{
  margin: 0 0 8px;
  font-size: clamp(17px, 1.6vw, 20px);
  font-weight: 700;
  line-height: 1.45;
  color: var(--star);
}

.page-about .ab-tl__desc{
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--dust);
  max-width: 34em;
}

.page-about .ab-tl__figure{
  margin: clamp(26px, 3.6vw, 44px) 0 0;
}

.page-about .ab-tl__figure .figure__frame img{
  display: block;
  width: 100%;
  object-fit: cover;
}

/* ---------- 团队卡片 ---------- */
.page-about .ab-roles{
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .ab-role{
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(16px, 2vw, 22px);
  background: var(--ink-800);
  border-top: 2px solid transparent;
  transition: background .22s var(--ease), border-color .22s var(--ease);
}

.page-about .ab-role:hover{
  background: var(--ink-700);
  border-top-color: var(--flame);
}

.page-about .ab-role__idx{
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--dust-dim);
}

.page-about .ab-role__name{
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--star);
}

.page-about .ab-role__num{
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
  line-height: 1;
}

.page-about .ab-role__num .mono{
  font-size: 24px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .ab-role__unit{
  font-size: 12.5px;
  color: var(--dust-dim);
}

.page-about .ab-role__desc{
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--dust);
}

@media (min-width: 640px){
  .page-about .ab-roles{
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px){
  .page-about .ab-roles{
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 方法区 ---------- */
.page-about .ab-method__figure{
  margin: 0;
}

.page-about .ab-method__figure .figure__frame img{
  display: block;
  width: 100%;
  object-fit: cover;
}

.page-about .ab-method__text{
  display: block;
}

.page-about .ab-legend{
  list-style: none;
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-legend__item{
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 10px 0 10px 14px;
  border-left: 2px solid var(--line);
}

.page-about .ab-legend__item--flame{ border-left-color: var(--flame); }
.page-about .ab-legend__item--cyan{ border-left-color: var(--cyan); }
.page-about .ab-legend__item--amber{ border-left-color: var(--amber); }

.page-about .ab-legend__key{
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--star);
  white-space: nowrap;
}

.page-about .ab-legend__txt{
  font-size: 14px;
  line-height: 1.8;
  color: var(--dust);
}

/* ---------- 服务指标 ---------- */
.page-about .ab-metrics{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .ab-metric{
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--ink-800);
}

.page-about .ab-metric__num{
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(25px, 3vw, 36px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--star);
}

.page-about .ab-metric__num--flame{ color: var(--flame); }
.page-about .ab-metric__num--cyan{ color: var(--cyan); }
.page-about .ab-metric__num--mint{ color: var(--mint); }
.page-about .ab-metric__num--amber{ color: var(--amber); }

.page-about .ab-metric__label{
  margin: 0;
  font-size: 14px;
  font-weight: 700;
  color: var(--star);
}

.page-about .ab-metric__desc{
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--dust);
}

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

@media (min-width: 1080px){
  .page-about .ab-metrics{
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 计划列表 ---------- */
.page-about .ab-plan{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-plan__item{
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: clamp(16px, 2.2vw, 22px) clamp(14px, 2vw, 20px);
  background: var(--ink-900);
  transition: background .2s var(--ease);
}

.page-about .ab-plan__item:hover{
  background: var(--ink-800);
}

.page-about .ab-plan__idx{
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--flame);
  padding-top: 3px;
}

.page-about .ab-plan__title{
  margin: 0 0 6px;
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--star);
}

.page-about .ab-plan__desc{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--dust);
  max-width: 40em;
}

/* ---------- 收尾 ---------- */
.page-about .ab-cta{
  padding: clamp(44px, 6vw, 84px) 0 clamp(52px, 7vw, 96px);
}

.page-about .ab-cta__inner{
  position: relative;
  display: grid;
  gap: 14px;
  padding: clamp(24px, 3.6vw, 46px);
  border: 1px solid var(--line);
  background:
    linear-gradient(135deg, rgba(255, 106, 43, .12), rgba(45, 226, 230, .10)),
    var(--ink-800);
}

.page-about .ab-cta__title{
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.28;
  max-width: 22em;
}

.page-about .ab-cta__desc{
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--dust);
  max-width: 40em;
}

.page-about .ab-cta__actions{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 18px;
  margin-top: 8px;
}

@media (prefers-reduced-motion: reduce){
  .page-about .ab-hero__figure{
    transform: none;
  }
  .page-about .ab-tl__item::before,
  .page-about .ab-role,
  .page-about .ab-plan__item{
    transition: none;
  }
}
<<<END>>>