.page-about{
  --ab-rail: 96px;
  --ab-gap: clamp(16px, 3vw, 40px);
  --ab-pad: clamp(48px, 7vw, 92px);
  padding-top: calc(var(--header-h) + clamp(8px, 2vw, 24px));
  overflow-x: hidden;
}

.page-about .section{
  padding: var(--ab-pad) 0;
}

.page-about h2,
.page-about h3{
  font-family: var(--font-title);
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--white);
  margin: 10px 0 0;
  line-height: 1.2;
}

.page-about h2{
  font-size: clamp(23px, 3.2vw, 36px);
}

.page-about p{
  color: var(--text);
  line-height: 1.85;
  font-size: clamp(15px, 1.4vw, 16.5px);
  margin: 14px 0 0;
}

.page-about a{
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  position: relative;
  overflow: hidden;
  padding: clamp(32px, 5vw, 72px) 0 clamp(36px, 5vw, 68px);
  background:
    radial-gradient(120% 90% at 92% -10%, rgba(35, 224, 196, .12), transparent 58%),
    var(--night);
}

.page-about .about-hero__slab{
  position: absolute;
  top: -26%;
  right: -16%;
  width: min(780px, 82%);
  height: 152%;
  background: linear-gradient(158deg, rgba(35, 224, 196, .2), rgba(35, 224, 196, 0) 62%);
  clip-path: polygon(44% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

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

.page-about .about-hero__title{
  font-family: var(--font-title);
  font-weight: 900;
  letter-spacing: -.02em;
  font-size: clamp(30px, 5.2vw, 58px);
  line-height: 1.12;
  color: var(--white);
  margin: 16px 0 0;
  max-width: 17ch;
}

.page-about .about-hero__lead{
  max-width: 62ch;
  margin-top: 22px;
}

.page-about .about-hero__actions{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-ribbon{
  list-style: none;
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-ribbon__item{
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: rgba(6, 24, 38, .74);
}

.page-about .about-ribbon__num{
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 600;
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .about-ribbon__label{
  font-size: 12.5px;
  color: var(--slate);
  letter-spacing: .04em;
}

/* ---------- 起点 ---------- */
.page-about .about-origin{
  background: var(--night-2);
}

.page-about .about-origin__grid{
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

.page-about .about-origin__text p:first-of-type{
  margin-top: 18px;
}

.page-about .about-origin__note{
  padding: 22px 22px 10px;
}

.page-about .about-origin__note-title{
  margin: 0;
  font-family: var(--font-title);
  font-weight: 700;
  color: var(--white);
  font-size: 15px;
  letter-spacing: .02em;
}

.page-about .about-origin__list{
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .about-origin__list li{
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-origin__num{
  font-size: 19px;
  font-weight: 600;
  color: var(--orange);
}

.page-about .about-origin__desc{
  font-size: 13.5px;
  color: var(--slate);
  line-height: 1.7;
}

/* ---------- 访问人群 ---------- */
.page-about .about-audience__grid{
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  align-items: center;
}

.page-about .about-audience__chart{
  position: relative;
  width: min(300px, 78vw);
  justify-self: center;
}

.page-about .about-audience__donut{
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-audience__donut-label{
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: grid;
  place-content: center;
  margin: 0;
  font-size: clamp(30px, 5vw, 44px);
  font-weight: 600;
  color: var(--white);
  line-height: 1;
}

.page-about .about-audience__donut-note{
  margin: 12px 0 0;
  text-align: center;
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--slate);
}

.page-about .about-audience__list{
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .about-audience__list li{
  position: relative;
  padding: 11px 0 11px 22px;
  border-top: 1px solid var(--line-soft);
  color: var(--text);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .about-audience__list li::before{
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  width: 9px;
  height: 2px;
  background: var(--cyan);
}

/* ---------- 编辑团队 ---------- */
.page-about .about-team__head{
  max-width: 66ch;
}

.page-about .about-team__intro{
  margin-top: 16px;
}

.page-about .about-team__figure{
  margin: clamp(26px, 4vw, 44px) 0 0;
}

.page-about .media__img{
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-team__figure .media{
  border: 1px solid var(--line);
  background: var(--ink);
  overflow: hidden;
}

.page-about .media__caption{
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--slate);
  line-height: 1.7;
}

.page-about .about-team__cards{
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-team__card{
  padding: 22px 20px;
}

.page-about .about-team__role{
  margin: 0;
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 16px;
  color: var(--white);
}

.page-about .about-team__count{
  margin: 10px 0 0;
  font-size: 30px;
  font-weight: 600;
  color: var(--cyan);
  line-height: 1;
}

.page-about .about-team__desc{
  margin-top: 12px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 频道 ---------- */
.page-about .about-channels{
  background: var(--night-2);
}

.page-about .about-channels__head{
  max-width: 60ch;
}

.page-about .about-channels__intro{
  margin-top: 12px;
  color: var(--slate);
  font-size: 14.5px;
}

.page-about .about-channels__list{
  margin-top: clamp(22px, 3vw, 34px);
  border-top: 1px solid var(--line-soft);
}

.page-about .channel{
  border-bottom: 1px solid var(--line-soft);
}

.page-about .channel__summary{
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
  transition: color var(--ease);
}

.page-about .channel__summary::-webkit-details-marker{
  display: none;
}

.page-about .channel__summary:hover .channel__name,
.page-about .channel__summary:focus-visible .channel__name{
  color: var(--cyan);
}

.page-about .channel__num{
  font-size: 13px;
  color: var(--cyan);
  flex: 0 0 auto;
}

.page-about .channel__name{
  flex: 1 1 auto;
  font-family: var(--font-title);
  font-weight: 700;
  font-size: clamp(16px, 2vw, 20px);
  color: var(--white);
  transition: color var(--ease);
}

.page-about .channel__mark{
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  position: relative;
}

.page-about .channel__mark::before,
.page-about .channel__mark::after{
  content: "";
  position: absolute;
  background: var(--slate);
  transition: transform var(--ease), background var(--ease);
}

.page-about .channel__mark::before{
  left: 0;
  right: 0;
  top: 10px;
  height: 2px;
}

.page-about .channel__mark::after{
  top: 0;
  bottom: 0;
  left: 10px;
  width: 2px;
}

.page-about .channel[open] .channel__mark::before{
  background: var(--cyan);
}

.page-about .channel[open] .channel__mark::after{
  transform: scaleY(0);
  background: var(--cyan);
}

.page-about .channel__body{
  padding: 0 0 22px;
  max-width: 68ch;
}

.page-about .channel__body p{
  margin-top: 0;
  font-size: 15px;
  line-height: 1.85;
}

.page-about .channel__link{
  display: inline-block;
  margin-top: 12px;
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-dim);
  padding-bottom: 2px;
}

.page-about .channel__link:hover{
  border-bottom-color: var(--cyan);
}

/* ---------- 发展历程 ---------- */
.page-about .about-history__head{
  max-width: 60ch;
}

.page-about .timeline__list{
  list-style: none;
  margin: clamp(26px, 4vw, 46px) 0 0;
  padding: 0;
}

.page-about .timeline__item{
  position: relative;
  display: grid;
  grid-template-columns: var(--ab-rail) minmax(0, 1fr);
  gap: 0 var(--ab-gap);
  padding-bottom: clamp(26px, 4vw, 44px);
}

.page-about .timeline__item::before{
  content: "";
  position: absolute;
  left: calc(var(--ab-rail) + var(--ab-gap) / 2);
  top: 10px;
  bottom: 0;
  width: 1px;
  background: var(--line-soft);
}

.page-about .timeline__item::after{
  content: "";
  position: absolute;
  left: calc(var(--ab-rail) + var(--ab-gap) / 2);
  top: 7px;
  width: 9px;
  height: 9px;
  margin-left: -4.5px;
  border-radius: 50%;
  background: var(--night);
  border: 1px solid var(--cyan);
  transition: background var(--ease), transform var(--ease);
}

.page-about .timeline__item:hover::after{
  background: var(--cyan);
  transform: scale(1.3);
}

.page-about .timeline__year{
  font-size: clamp(18px, 2.2vw, 26px);
  font-weight: 600;
  color: var(--cyan);
  letter-spacing: .02em;
  line-height: 1.1;
}

.page-about .timeline__title{
  margin: 0 0 8px;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
}

.page-about .timeline__text{
  margin: 0;
  max-width: 64ch;
  font-size: 15.5px;
}

.page-about .timeline__more{
  max-height: 0;
  opacity: 0;
  margin: 0;
  padding: 0 14px;
  border-left: 2px solid var(--cyan-dim);
  background: rgba(13, 43, 63, .5);
  color: var(--slate);
  font-size: 13.8px;
  line-height: 1.78;
  overflow: hidden;
  transition: max-height var(--ease), opacity var(--ease), margin var(--ease), padding var(--ease);
}

.page-about .timeline__item:hover .timeline__more,
.page-about .timeline__item:focus-within .timeline__more{
  max-height: 220px;
  opacity: 1;
  margin-top: 12px;
  padding: 12px 14px;
}

.page-about .about-history__figure{
  margin: clamp(30px, 5vw, 56px) 0 0;
  padding: 0 20px;
}

.page-about .about-history__figure .media{
  max-width: var(--maxw);
  margin: 0 auto;
  border: 1px solid var(--line);
  background: var(--ink);
  overflow: hidden;
}

.page-about .about-history__figure .media__caption{
  max-width: var(--maxw);
  margin: 10px auto 0;
}

/* ---------- 内容维护 ---------- */
.page-about .about-upkeep{
  background: var(--night-2);
}

.page-about .about-upkeep__grid{
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  align-items: center;
}

.page-about .about-upkeep__figure{
  margin: 0;
  width: min(420px, 100%);
  justify-self: center;
}

.page-about .about-upkeep__figure .media{
  border: 1px solid var(--line);
  background: var(--ink);
  overflow: hidden;
}

.page-about .about-upkeep__stats{
  margin: 24px 0 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-upkeep__stat{
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 16px;
  background: rgba(6, 24, 38, .78);
}

.page-about .about-upkeep__stat dt{
  font-size: 13.5px;
  color: var(--slate);
}

.page-about .about-upkeep__stat dd{
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
}

/* ---------- 接着看 ---------- */
.page-about .about-next__head{
  max-width: 58ch;
}

.page-about .about-next__grid{
  margin-top: clamp(24px, 4vw, 38px);
  display: grid;
  gap: 14px;
}

.page-about .about-next__card{
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 20px;
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--cyan-dim);
  background: linear-gradient(160deg, rgba(13, 43, 63, .85), rgba(6, 24, 38, .9));
  text-decoration: none;
  transition: border-left-color var(--ease), transform var(--ease), border-color var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible{
  border-color: var(--cyan);
  border-left-color: var(--orange);
  transform: translateY(-3px);
}

.page-about .about-next__card-title{
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 17px;
  color: var(--white);
}

.page-about .about-next__card-desc{
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px){
  .page-about .about-ribbon{
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-next__grid{
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 960px){
  .page-about .about-origin__grid{
    grid-template-columns: minmax(0, 1.55fr) minmax(0, .85fr);
  }

  .page-about .about-audience__grid{
    grid-template-columns: minmax(0, 340px) minmax(0, 1fr);
  }

  .page-about .about-upkeep__grid{
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
  }
}

@media (max-width: 860px){
  .page-about{
    --ab-rail: 68px;
    padding-top: calc(var(--header-h) + 4px);
  }

  .page-about .about-hero__slab{
    width: 92%;
    right: -26%;
    opacity: .7;
  }

  .page-about .timeline__list{
    display: flex;
    gap: 14px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 14px;
    margin-right: -20px;
    padding-right: 20px;
  }

  .page-about .timeline__item{
    flex: 0 0 76%;
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
    scroll-snap-align: start;
    padding: 18px 16px 16px;
    border: 1px solid var(--line-soft);
    background: rgba(13, 43, 63, .55);
  }

  .page-about .timeline__item::before,
  .page-about .timeline__item::after{
    display: none;
  }

  .page-about .timeline__text{
    font-size: 14.5px;
  }

  .page-about .about-history__figure{
    padding: 0 20px;
  }
}

@media (hover: none){
  .page-about .timeline__more{
    max-height: none;
    opacity: 1;
    margin-top: 12px;
    padding: 12px 14px;
  }
}
<<<END>>>