/* ============ 品牌总览 · page-about ============ */
.page-about{
  --about-rail-w: 232px;
  --about-rail-gap: clamp(28px, 4vw, 64px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(44px, 8vw, 104px) 0 clamp(36px, 6vw, 76px);
}
.page-about .about-hero__media{
  position: absolute;
  inset: 0;
  z-index: -2;
}
.page-about .about-hero__media img{
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .46;
  display: block;
}
.page-about .about-hero::after{
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(
    176deg,
    rgba(6, 11, 22, .28) 0%,
    rgba(6, 11, 22, .74) 48%,
    var(--ink-900) 100%
  );
}
.page-about .about-hero__inner{
  position: relative;
}
.page-about .about-hero h1{
  margin: 14px 0 0;
  max-width: 18ch;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(30px, 6vw, 54px);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--text-strong);
}
.page-about .about-hero__lede{
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--text);
}
.page-about .about-hero__stats{
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.page-about .about-hero__stats li{
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  border-radius: var(--radius);
  background: rgba(12, 23, 48, .66);
  border: 1px solid var(--line-soft);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.page-about .about-hero__stats .data-num{
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan-400);
}
.page-about .about-hero__stats .data-num--hot{
  color: var(--orange-500);
}
.page-about .about-hero__stat-label{
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-dim);
}

/* ---------- 主干：栏目轴 + 长文 ---------- */
.page-about .about-shell{
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
  align-items: start;
  padding-bottom: clamp(56px, 8vw, 112px);
}

.page-about .about-rail{
  padding-top: 6px;
}
.page-about .about-rail__title{
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--text-dim);
  text-transform: uppercase;
}
.page-about .about-rail__list{
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  scrollbar-width: thin;
}
.page-about .about-rail__link{
  display: inline-block;
  white-space: nowrap;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--line-soft);
  background: var(--ink-800);
  font-size: 14px;
  color: var(--text-dim);
  text-decoration: none;
  transition: color .16s ease, border-color .16s ease, background-color .16s ease;
}
.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible{
  color: var(--text-strong);
  border-color: var(--line-cyan);
}
.page-about .about-rail__link.is-active{
  color: var(--ink-900);
  background: var(--cyan-400);
  border-color: var(--cyan-400);
  font-weight: 700;
}
.page-about .about-rail__foot{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter{
  scroll-margin-top: 104px;
}
.page-about .about-chapter + .about-chapter{
  margin-top: clamp(48px, 7vw, 92px);
}
.page-about .chapter-kicker{
  margin: 18px 0 0;
  padding-left: 16px;
  border-left: 3px solid var(--orange-500);
  font-family: var(--font-head);
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  line-height: 1.6;
  color: var(--text-strong);
  max-width: 40ch;
}
.page-about .prose p{
  margin: 18px 0 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
}

/* ---------- 小雨点数据卡 ---------- */
.page-about .about-dots{
  list-style: none;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(168px, 1fr));
  gap: 14px;
}
.page-about .dot-card{
  padding: 16px 18px;
  border-radius: var(--radius);
  background: var(--ink-700);
  border: 1px solid var(--line-soft);
  transition: transform .16s ease, border-color .16s ease;
}
.page-about .dot-card:hover{
  transform: translateY(-3px);
  border-color: var(--line-cyan);
}
.page-about .dot-card .data-num{
  display: block;
  font-size: 26px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan-400);
}
.page-about .dot-card .data-num--hot{
  color: var(--orange-500);
}
.page-about .dot-card p{
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-dim);
}

/* ---------- 图文两侧排布 ---------- */
.page-about .about-split{
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  align-items: start;
  margin-top: clamp(24px, 3.5vw, 36px);
}
.page-about .about-split .prose p:first-child{
  margin-top: 0;
}
.page-about .about-figure{
  margin: 0;
}
.page-about .about-figure img{
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  display: block;
}

/* ---------- 技能树式团队分工 ---------- */
.page-about .team-tree{
  margin-top: clamp(26px, 4vw, 40px);
}
.page-about .tree-root{
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--line-cyan);
  background: linear-gradient(100deg, rgba(36, 224, 206, .16), rgba(255, 122, 42, .12));
}
.page-about .tree-root .data-num{
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--text-strong);
}
.page-about .tree-root span:last-child{
  font-size: 14px;
  color: var(--text);
}
.page-about .tree-branches{
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}
.page-about .tree-node{
  position: relative;
  padding: 16px 18px 16px 22px;
  border-radius: var(--radius);
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
  transition: transform .16s ease;
}
.page-about .tree-node:hover{
  transform: translateY(-2px);
}
.page-about .tree-node::before{
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  bottom: 12px;
  width: 3px;
  border-radius: 3px;
  background: var(--cyan-400);
}
.page-about .tree-node--orange::before{ background: var(--orange-500); }
.page-about .tree-node--magenta::before{ background: var(--magenta-500); }
.page-about .tree-node__head{
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  color: var(--text-strong);
}
.page-about .tree-node__head .data-num{
  font-size: 22px;
  color: var(--cyan-400);
}
.page-about .tree-node--orange .tree-node__head .data-num{ color: var(--orange-500); }
.page-about .tree-node--magenta .tree-node__head .data-num{ color: var(--magenta-500); }
.page-about .tree-node__desc{
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}

/* ---------- 横向阶段时间轴 ---------- */
.page-about .stage-track{
  margin-top: clamp(26px, 4vw, 40px);
  display: flex;
  gap: 16px;
  overflow-x: auto;
  padding: 4px 0 18px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}
.page-about .stage-track::-webkit-scrollbar{ height: 6px; }
.page-about .stage-track::-webkit-scrollbar-track{
  background: rgba(159, 176, 201, .12);
  border-radius: 3px;
}
.page-about .stage-track::-webkit-scrollbar-thumb{
  background: var(--line-cyan);
  border-radius: 3px;
}
.page-about .stage-item{
  position: relative;
  flex: 0 0 min(80%, 288px);
  scroll-snap-align: start;
  padding: 22px 20px 20px;
  border-radius: var(--radius);
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
}
.page-about .stage-item::before{
  content: "";
  position: absolute;
  top: 0;
  left: 20px;
  width: 34px;
  height: 3px;
  border-radius: 0 0 3px 3px;
  background: var(--cyan-400);
}
.page-about .stage-item--now{
  border-color: var(--line-cyan);
}
.page-about .stage-item--now::before{
  background: var(--orange-500);
}
.page-about .stage-item h3{
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--text-strong);
}
.page-about .stage-item p:last-child{
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta{
  margin-top: clamp(52px, 8vw, 96px);
  padding: clamp(24px, 4vw, 38px);
}
.page-about .about-cta h2{
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--text-strong);
}
.page-about .about-cta__grid{
  margin-top: 20px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}
.page-about .cta-item{
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  border-radius: var(--radius);
  background: rgba(6, 11, 22, .5);
  border: 1px solid var(--line-soft);
  text-decoration: none;
  transition: border-color .16s ease, transform .16s ease;
}
.page-about .cta-item:hover,
.page-about .cta-item:focus-visible{
  border-color: var(--cyan-400);
  transform: translateY(-2px);
}
.page-about .cta-item__label{
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--cyan-400);
}
.page-about .cta-item__desc{
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-dim);
}
.page-about .about-cta__foot{
  margin: 22px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
}
.page-about .about-cta__foot a{
  color: var(--orange-500);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 平板及窄屏 ---------- */
@media (max-width: 719px){
  .page-about .about-hero__stats li{
    padding: 12px 14px;
  }
  .page-about .stage-item{
    flex-basis: 82%;
  }
}

/* ---------- 桌面：固定栏目轴 + 长文 ---------- */
@media (min-width: 980px){
  .page-about .about-shell{
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-rail-gap);
  }
  .page-about .about-rail{
    position: sticky;
    top: 108px;
  }
  .page-about .about-rail__list{
    flex-direction: column;
    overflow: visible;
    gap: 4px;
    padding-bottom: 0;
  }
  .page-about .about-rail__link{
    display: block;
    white-space: normal;
    padding: 9px 0 9px 14px;
    border: 0;
    border-left: 2px solid var(--line-soft);
    border-radius: 0;
    background: transparent;
    font-size: 15px;
  }
  .page-about .about-rail__link.is-active{
    background: transparent;
    color: var(--text-strong);
    border-left-color: var(--cyan-400);
    font-weight: 700;
  }
  .page-about .about-rail__link:hover{
    background: transparent;
  }
  .page-about .about-hero__stats{
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
    max-width: 900px;
  }
  .page-about .about-split{
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }
  .page-about .about-split--rev{
    grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
  }
  .page-about .about-split--rev .prose{
    order: 2;
  }
  .page-about .about-split--rev .about-figure{
    order: 1;
  }
  .page-about .tree-branches{
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-cta__grid{
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 大屏：时间轴铺开 ---------- */
@media (min-width: 1240px){
  .page-about .stage-item{
    flex-basis: 258px;
  }
}

/* ---------- 降低动效偏好 ---------- */
@media (prefers-reduced-motion: reduce){
  .page-about .dot-card,
  .page-about .tree-node,
  .page-about .cta-item,
  .page-about .about-rail__link{
    transition: none;
  }
  .page-about .dot-card:hover,
  .page-about .tree-node:hover,
  .page-about .cta-item:hover{
    transform: none;
  }
}
<<<END>>>