.page-about{
  --about-rail-w: 212px;
  --about-line: linear-gradient(90deg, rgba(34, 48, 90, 0.95), rgba(34, 48, 90, 0) 78%);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  padding-top: clamp(86px, 12vh, 130px);
  padding-bottom: clamp(6px, 2vw, 18px);
}

.page-about .breadcrumb{
  margin-bottom: clamp(14px, 2vw, 22px);
}
.page-about .breadcrumb ol{
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
}
.page-about .breadcrumb a{
  color: var(--mist);
  text-decoration: none;
  transition: color 0.25s var(--ease);
}
.page-about .breadcrumb a:hover{
  color: var(--lake);
}
.page-about .breadcrumb li + li::before{
  content: "/";
  margin-inline-end: 8px;
  color: var(--orbit);
}
.page-about .breadcrumb li[aria-current]{
  color: var(--star);
}

.page-about .about-hero__stage{
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: clamp(400px, 66vh, 620px);
  border-radius: var(--radius-xl);
  border: 1px solid var(--line);
  overflow: hidden;
  background: var(--night);
}
.page-about .about-hero__img{
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 62%;
}
.page-about .about-hero__veil{
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(6, 10, 24, 0.22) 0%, rgba(6, 10, 24, 0.58) 44%, rgba(6, 10, 24, 0.95) 100%),
    linear-gradient(96deg, rgba(124, 92, 255, 0.24), rgba(6, 10, 24, 0) 58%);
}
.page-about .about-hero__glow{
  position: absolute;
  top: 14%;
  right: 9%;
  width: clamp(96px, 16vw, 220px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 194, 75, 0.5), rgba(255, 194, 75, 0) 66%);
  filter: blur(4px);
}
.page-about .about-hero__copy{
  position: relative;
  z-index: 2;
  width: 100%;
  padding: clamp(22px, 4vw, 54px);
}
.page-about .about-hero__eyebrow{
  margin: 0 0 10px;
  font-size: 0.74rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--lake);
}
.page-about .about-hero__copy h1{
  margin: 0 0 16px;
  max-width: 20ch;
  font-size: clamp(1.9rem, 7vw, 4.2rem);
  line-height: 1.12;
  font-weight: 800;
  letter-spacing: -0.022em;
  color: var(--star);
}
.page-about .about-hero__lede{
  margin: 0;
  max-width: 46ch;
  font-size: clamp(0.94rem, 2.4vw, 1.06rem);
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-hero__facts{
  list-style: none;
  margin: clamp(18px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
.page-about .about-hero__facts li{
  padding: 14px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line-soft);
  background: var(--surface);
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--mist);
}
.page-about .about-num{
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.26em;
  color: var(--gold);
  letter-spacing: 0;
  margin-inline-end: 4px;
}

/* ---------- 主体与章节轨道 ---------- */
.page-about .about-body{
  padding-block: var(--band);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 46px);
}
.page-about .about-main{
  min-width: 0;
}
.page-about .about-rail{
  display: none;
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter{
  position: relative;
  padding-block: clamp(28px, 3.8vw, 48px);
}
.page-about .about-chapter::before{
  content: "";
  position: absolute;
  inset-inline: 0;
  top: 0;
  height: 1px;
  background: var(--about-line);
}
.page-about .about-chapter:first-of-type{
  padding-top: 0;
}
.page-about .about-chapter:first-of-type::before{
  display: none;
}
.page-about .about-chapter__kicker{
  margin: 0 0 10px;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  font-family: var(--font-mono);
  color: var(--lake);
}
.page-about .about-chapter__title{
  margin: 0 0 clamp(12px, 1.8vw, 18px);
  font-size: clamp(1.5rem, 5.4vw, 2.25rem);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.016em;
  color: var(--star);
}
.page-about .about-chapter__lede{
  margin: 0 0 clamp(18px, 2.6vw, 28px);
  max-width: 40em;
  font-size: clamp(0.94rem, 2.2vw, 1.02rem);
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-prose{
  max-width: 38em;
}
.page-about .about-prose p{
  margin: 0 0 1em;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--mist);
}
.page-about .about-prose p:last-child{
  margin-bottom: 0;
}

.page-about .about-quote{
  margin: clamp(20px, 2.8vw, 30px) 0 0;
  padding: clamp(18px, 2.6vw, 28px) clamp(18px, 3vw, 34px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(23, 179, 196, 0.3);
  background: linear-gradient(118deg, rgba(23, 179, 196, 0.16), rgba(124, 92, 255, 0.13));
}
.page-about .about-quote p{
  margin: 0;
  font-size: clamp(1rem, 2.6vw, 1.16rem);
  line-height: 1.72;
  color: var(--star);
}

/* ---------- 两列图文对峙 ---------- */
.page-about .about-split{
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  align-items: start;
}
.page-about .about-roles{
  display: grid;
  gap: 12px;
}
.page-about .about-role{
  padding: 16px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line-soft);
  background: var(--surface);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}
.page-about .about-role:hover{
  border-color: rgba(23, 179, 196, 0.48);
  transform: translateX(3px);
}
.page-about .about-role__title{
  margin: 0 0 7px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--star);
}
.page-about .about-role__unit{
  font-size: 0.78rem;
  font-weight: 400;
  color: var(--mist);
}
.page-about .about-role p{
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-figure{
  position: relative;
  margin: 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  overflow: hidden;
  background: var(--night);
}
.page-about .about-figure__img{
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  max-width: 100%;
}
.page-about .about-figure::after{
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(14, 26, 56, 0.16), rgba(6, 10, 24, 0.62));
  pointer-events: none;
}
.page-about .about-figure__glow{
  position: absolute;
  top: 12%;
  right: 11%;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 194, 75, 0.62), rgba(255, 194, 75, 0) 68%);
  filter: blur(3px);
  z-index: 2;
}
.page-about .about-figure__caption{
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  z-index: 3;
  padding: 11px 16px;
  border-top: 1px solid var(--line-soft);
  background: rgba(6, 10, 24, 0.66);
  font-size: 0.76rem;
  color: var(--mist);
}

/* ---------- 生产流程横向带 ---------- */
.page-about .about-flow{
  list-style: none;
  margin: 0;
  padding: 14px 2px 20px;
  display: flex;
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
}
.page-about .about-flow__step{
  position: relative;
  flex: 0 0 clamp(228px, 76vw, 286px);
  scroll-snap-align: start;
  padding: 20px 18px 20px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(16, 27, 56, 0.92), rgba(9, 15, 32, 0.74));
}
.page-about .about-flow__step::before{
  content: "";
  position: absolute;
  top: -6px;
  left: 20px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(255, 194, 75, 0.14);
}
.page-about .about-flow__idx{
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--lake);
}
.page-about .about-flow__step h3{
  margin: 0 0 8px;
  font-size: 1.04rem;
  color: var(--star);
}
.page-about .about-flow__step p{
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 版本坐标 ---------- */
.page-about .about-versions{
  position: relative;
  border-radius: var(--radius-xl);
  border: 1px solid var(--line);
  overflow: hidden;
  background: var(--deep);
}
.page-about .about-versions__bg{
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.32;
}
.page-about .about-versions__veil{
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(6, 10, 24, 0.68), rgba(6, 10, 24, 0.94)),
    radial-gradient(circle at 82% 12%, rgba(124, 92, 255, 0.34), rgba(6, 10, 24, 0) 60%);
}
.page-about .about-versions__inner{
  position: relative;
  z-index: 2;
  padding: clamp(22px, 4vw, 46px);
}
.page-about .about-milestones{
  list-style: none;
  margin: 0;
  padding: 12px 2px 10px;
  display: flex;
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
}
.page-about .about-node{
  position: relative;
  flex: 0 0 clamp(206px, 68vw, 252px);
  scroll-snap-align: start;
  padding: 20px 18px 18px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-soft);
  background: rgba(14, 26, 56, 0.72);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), background 0.3s var(--ease);
}
.page-about .about-node::before{
  content: "";
  position: absolute;
  top: -6px;
  left: 20px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(255, 194, 75, 0.14);
}
.page-about .about-node:hover,
.page-about .about-node:focus,
.page-about .about-node:focus-within{
  transform: translateY(-6px);
  border-color: rgba(255, 194, 75, 0.5);
  background: rgba(21, 36, 70, 0.94);
  outline: none;
}
.page-about .about-node:focus-visible{
  outline: 2px solid var(--lake);
  outline-offset: 3px;
}
.page-about .about-node__year{
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 1.36rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--gold);
}
.page-about .about-node h3{
  margin: 10px 0 8px;
  font-size: 1rem;
  color: var(--star);
}
.page-about .about-node p{
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 观赛人群 ---------- */
.page-about .about-audience{
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 36px);
}
.page-about .about-metrics{
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  align-content: start;
}
.page-about .about-metric{
  padding: 15px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line-soft);
  background: var(--surface);
}
.page-about .about-metric--wide{
  grid-column: 1 / -1;
}
.page-about .about-metric__value{
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.45rem, 5vw, 1.9rem);
  font-weight: 700;
  line-height: 1.12;
  color: var(--gold);
}
.page-about .about-metric__value small{
  margin-inline-start: 3px;
  font-size: 0.56em;
  font-weight: 500;
  color: var(--mist);
}
.page-about .about-metric__value--text{
  font-size: clamp(1.06rem, 3.6vw, 1.32rem);
  letter-spacing: 0.01em;
}
.page-about .about-metric__label{
  margin: 7px 0 0;
  font-size: 0.79rem;
  line-height: 1.6;
  color: var(--mist);
}
.page-about .about-notes{
  display: grid;
}
.page-about .about-note{
  padding: clamp(16px, 2vw, 20px) 0;
  border-bottom: 1px dashed var(--line-soft);
}
.page-about .about-note:first-child{
  padding-top: 0;
}
.page-about .about-note:last-child{
  border-bottom: 0;
  padding-bottom: 0;
}
.page-about .about-note h3{
  margin: 0 0 7px;
  font-size: 1rem;
  color: var(--star);
}
.page-about .about-note p{
  margin: 0;
  max-width: 40em;
  font-size: 0.91rem;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 合作与认可 ---------- */
.page-about .about-partners{
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}
.page-about .about-partner{
  padding: clamp(18px, 2.6vw, 28px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-soft);
  background: linear-gradient(142deg, rgba(23, 179, 196, 0.13), rgba(124, 92, 255, 0.1) 68%, rgba(6, 10, 24, 0.2));
}
.page-about .about-partner__title{
  margin: 0 0 10px;
  font-size: 1.08rem;
  color: var(--star);
}
.page-about .about-partner p{
  margin: 0 0 14px;
  font-size: 0.91rem;
  line-height: 1.78;
  color: var(--mist);
}
.page-about .about-partner__link{
  display: inline-block;
  font-size: 0.84rem;
  color: var(--lake);
  text-decoration: none;
  border-bottom: 1px solid rgba(23, 179, 196, 0.42);
  padding-bottom: 2px;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}
.page-about .about-partner__link:hover,
.page-about .about-partner__link:focus-visible{
  color: var(--gold);
  border-color: rgba(255, 194, 75, 0.6);
}

/* ---------- 收束入口 ---------- */
.page-about .about-next{
  margin-top: clamp(36px, 5vw, 68px);
  padding-top: clamp(28px, 4vw, 46px);
  border-top: 1px solid var(--line-soft);
}
.page-about .about-next__title{
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  font-size: clamp(1.3rem, 4vw, 1.7rem);
  font-weight: 800;
  letter-spacing: -0.014em;
  color: var(--star);
}
.page-about .about-next__grid{
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}
.page-about .about-next__stack{
  display: grid;
  gap: 14px;
  align-content: start;
}
.page-about .about-linkcard{
  display: block;
  padding: clamp(18px, 2.6vw, 28px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-soft);
  background: var(--surface);
  color: inherit;
  text-decoration: none;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), background 0.3s var(--ease);
}
.page-about .about-linkcard:hover,
.page-about .about-linkcard:focus-visible{
  transform: translateY(-4px);
  border-color: rgba(23, 179, 196, 0.55);
  background: rgba(20, 34, 68, 0.9);
  outline: none;
}
.page-about .about-linkcard--lead{
  background: linear-gradient(150deg, rgba(23, 179, 196, 0.18), rgba(124, 92, 255, 0.14) 72%, rgba(6, 10, 24, 0.3));
  border-color: rgba(23, 179, 196, 0.32);
}
.page-about .about-linkcard__title{
  margin: 0 0 9px;
  font-size: clamp(1.06rem, 3vw, 1.28rem);
  color: var(--star);
}
.page-about .about-linkcard p{
  margin: 0 0 14px;
  font-size: 0.89rem;
  line-height: 1.75;
  color: var(--mist);
}
.page-about .about-linkcard__go{
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--lake);
}
.page-about .about-next__note{
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--mist);
}
.page-about .about-next__note a{
  color: var(--lake);
  text-decoration: none;
  border-bottom: 1px solid rgba(23, 179, 196, 0.42);
}
.page-about .about-next__note a:hover{
  color: var(--gold);
}

/* ---------- 中等屏幕 ---------- */
@media (min-width: 720px){
  .page-about .about-hero__facts{
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
  }
  .page-about .about-partners{
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-flow__step{
    flex: 0 0 300px;
  }
  .page-about .about-node{
    flex: 0 0 262px;
  }
}

@media (min-width: 900px){
  .page-about .about-split{
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(26px, 3.4vw, 44px);
  }
  .page-about .about-figure__img{
    aspect-ratio: 4 / 3;
  }
  .page-about .about-audience{
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(26px, 3.6vw, 48px);
  }
  .page-about .about-next__grid{
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 16px;
  }
}

/* ---------- 宽屏：左侧章节轨道 ---------- */
@media (min-width: 1080px){
  .page-about .about-body{
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 76px);
    align-items: start;
  }
  .page-about .about-rail{
    display: block;
    position: sticky;
    top: 108px;
    padding: 18px 14px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--line-soft);
    background: linear-gradient(180deg, rgba(14, 26, 56, 0.74), rgba(6, 10, 24, 0.42));
  }
  .page-about .about-rail__label{
    margin: 0 0 10px;
    padding-inline-start: 12px;
    font-size: 0.68rem;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    color: var(--stand);
  }
  .page-about .about-flow{
    overflow-x: visible;
    padding-bottom: 6px;
    gap: 16px;
  }
  .page-about .about-flow__step{
    flex: 1 1 0;
    min-width: 0;
  }
  .page-about .about-milestones{
    gap: 18px;
    padding-bottom: 6px;
  }
}

.page-about .about-rail__list{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}
.page-about .about-rail__link{
  display: block;
  padding: 8px 12px;
  border-radius: var(--radius-pill);
  border-inline-start: 2px solid transparent;
  font-size: 0.85rem;
  color: var(--mist);
  text-decoration: none;
  transition: color 0.25s var(--ease), background 0.25s var(--ease), border-color 0.25s var(--ease);
}
.page-about .about-rail__link:hover{
  color: var(--star);
  background: rgba(23, 179, 196, 0.1);
}
.page-about .about-rail__link.is-active{
  color: var(--star);
  font-weight: 600;
  background: rgba(23, 179, 196, 0.16);
  border-inline-start-color: var(--lake);
}

@media (prefers-reduced-motion: reduce){
  .page-about .about-role,
  .page-about .about-node,
  .page-about .about-linkcard{
    transition: none;
  }
  .page-about .about-node:hover,
  .page-about .about-node:focus,
  .page-about .about-linkcard:hover,
  .page-about .about-linkcard:focus-visible,
  .page-about .about-role:hover{
    transform: none;
  }
}
<<<END>>>