.page-about {
  --about-line-gap: clamp(20px, 3vw, 34px);
  max-width: var(--max);
  margin-inline: auto;
  padding: 0 var(--pad) clamp(56px, 9vw, 104px);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--scroll-text);
}

/* ---------- 左右分屏骨架 ---------- */
.about-frame {
  display: block;
}

.about-flow {
  min-width: 0;
}

.about-rail {
  display: none;
}

@media (min-width: 1040px) {
  .about-frame {
    display: grid;
    grid-template-columns: 210px minmax(0, 1fr);
    column-gap: clamp(28px, 4vw, 58px);
    align-items: start;
  }

  .about-rail {
    display: block;
    align-self: stretch;
  }

  .about-rail__inner {
    position: sticky;
    top: clamp(28px, 9vh, 84px);
  }

  .about-rail__label {
    margin: 0 0 16px;
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: .2em;
    color: var(--mute);
  }

  .about-rail__list {
    position: relative;
    margin: 0;
    padding: 0 0 0 20px;
    list-style: none;
  }

  .about-rail__list::before {
    content: "";
    position: absolute;
    left: 5px;
    top: 8px;
    bottom: 8px;
    width: 1px;
    background: var(--line-soft);
  }

  .about-rail__item {
    position: relative;
  }

  .about-rail__node {
    position: relative;
    display: block;
    padding: 10px 0;
    text-decoration: none;
    color: var(--mute);
    transition: color .18s ease;
  }

  .about-rail__dot {
    position: absolute;
    left: -20px;
    top: 16px;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    border: 1px solid var(--neon-dim);
    background: transparent;
    transition: background .2s ease, border-color .2s ease, box-shadow .2s ease;
  }

  .about-rail__num {
    display: block;
    font-size: 11px;
    letter-spacing: .14em;
    color: var(--neon-dim);
    transition: color .2s ease;
  }

  .about-rail__name {
    display: block;
    font-size: 14px;
    line-height: 1.4;
  }

  .about-rail__node:hover,
  .about-rail__node.is-active {
    color: var(--white);
  }

  .about-rail__node.is-active .about-rail__dot {
    background: var(--neon);
    border-color: var(--neon);
    box-shadow: 0 0 0 4px rgba(75, 227, 176, .16);
  }

  .about-rail__node.is-active .about-rail__num {
    color: var(--neon);
  }
}

/* ---------- 首屏 ---------- */
.about-hero {
  padding-top: clamp(24px, 5vw, 52px);
}

.about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(18px, 3vw, 30px);
}

@media (min-width: 860px) {
  .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .92fr);
    align-items: end;
  }
}

.about-hero__title {
  margin: 0 0 16px;
  font-size: clamp(27px, 4.6vw, 44px);
  line-height: 1.16;
  letter-spacing: -.01em;
  font-weight: 800;
  color: var(--white);
}

.about-hero__lede {
  margin: 0 0 24px;
  max-width: 46ch;
  font-size: 15.5px;
  color: var(--scroll-text);
}

.about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.about-hero__media {
  margin: 0;
}

/* ---------- 章节通用 ---------- */
.about-sec {
  border-top: 1px solid var(--line);
  padding-block: clamp(34px, 5.5vw, 68px);
}

.about-sec__head {
  display: flex;
  gap: clamp(10px, 1.6vw, 18px);
  align-items: baseline;
  margin-bottom: clamp(16px, 2.4vw, 24px);
}

.about-sec__no {
  flex: none;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--neon);
}

.about-sec__title {
  margin: 0;
  font-size: clamp(22px, 3.2vw, 33px);
  line-height: 1.25;
  letter-spacing: -.01em;
  font-weight: 800;
  color: var(--white);
}

.about-sec__body p {
  margin: 0 0 15px;
}

.about-sec__body p:last-child {
  margin-bottom: 0;
}

.about-sec__lead {
  margin: 0 0 clamp(16px, 2.4vw, 22px);
  max-width: 62ch;
  font-size: 15.5px;
}

.about-sec__note {
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: 14px;
  color: var(--mute);
}

.about-sec__note a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(75, 227, 176, .38);
}

.about-subhead {
  margin: clamp(30px, 4.5vw, 46px) 0 0;
  font-size: clamp(18px, 2.2vw, 22px);
  letter-spacing: -.005em;
  color: var(--white);
}

/* ---------- 三类服务要点 ---------- */
.about-points {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.about-points li {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
}

.about-points__k {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--amber);
}

/* ---------- 覆盖地区分布 ---------- */
.about-dist {
  margin-top: clamp(20px, 3vw, 30px);
}

.about-dist__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.about-dist__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 68px;
  grid-template-areas:
    "region count"
    "bar bar";
  gap: 6px 12px;
  align-items: baseline;
}

.about-dist__region {
  grid-area: region;
  font-size: 14.5px;
  color: var(--white);
  transition: color .18s ease;
}

.about-dist__count {
  grid-area: count;
  text-align: right;
  font-size: 20px;
  font-weight: 600;
  color: var(--amber);
}

.about-dist__bar {
  grid-area: bar;
  display: block;
  height: 6px;
  border-radius: 3px;
  background: var(--ink-2);
  overflow: hidden;
}

.about-dist__fill {
  display: block;
  height: 100%;
  border-radius: 3px;
  background: var(--neon);
  transition: filter .2s ease, box-shadow .2s ease;
}

.about-dist__row:nth-child(1) .about-dist__fill { width: 52.2%; background: var(--neon); }
.about-dist__row:nth-child(2) .about-dist__fill { width: 19.6%; background: var(--neon-dim); }
.about-dist__row:nth-child(3) .about-dist__fill { width: 17.4%; background: var(--neon-dim); }
.about-dist__row:nth-child(4) .about-dist__fill { width: 10.8%; background: var(--mute); }

.about-dist__row:hover .about-dist__fill,
.about-dist__row:focus-within .about-dist__fill {
  filter: brightness(1.18);
  box-shadow: 0 0 14px rgba(75, 227, 176, .42);
}

.about-dist__row:hover .about-dist__region {
  color: var(--neon);
}

/* ---------- 暖纸阅读面 ---------- */
.about-paper {
  margin-block: clamp(30px, 5vw, 60px);
  padding: clamp(26px, 4.5vw, 54px) clamp(20px, 3.5vw, 48px);
  background: var(--paper);
  color: #40504A;
  border-radius: clamp(26px, 5vw, 58px);
}

.about-paper .about-sec {
  border-top-color: var(--paper-line);
}

.about-paper .about-sec:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.about-paper .about-sec:last-of-type {
  padding-bottom: 0;
}

.about-paper .about-sec__no {
  color: var(--neon-dim);
}

.about-paper .about-sec__title {
  color: var(--ink-text);
}

.about-paper .about-sec__body p,
.about-paper .about-sec__lead {
  color: #40504A;
}

.about-paper .about-split__media .media__caption {
  color: #5F6E68;
}

.about-split {
  display: grid;
  gap: var(--about-line-gap);
}

@media (min-width: 760px) {
  .about-split {
    grid-template-columns: minmax(0, .78fr) minmax(0, 1.22fr);
    align-items: start;
  }
}

.about-split__media {
  margin: 0;
}

.about-split__text p {
  margin: 0 0 15px;
}

.about-split__text p:last-child {
  margin-bottom: 0;
}

/* ---------- 团队分工 ---------- */
.about-crew {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.about-crew__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "name num"
    "track track";
  gap: 8px 14px;
  align-items: baseline;
}

.about-crew__name {
  grid-area: name;
  font-size: 15px;
  color: var(--ink-text);
}

.about-crew__num {
  grid-area: num;
  font-size: 19px;
  font-weight: 600;
  color: var(--neon-dim);
}

.about-crew__track {
  grid-area: track;
  display: block;
  height: 10px;
  border-radius: 5px;
  background: rgba(216, 207, 187, .6);
  overflow: hidden;
}

.about-crew__fill {
  display: block;
  height: 100%;
  border-radius: 5px;
  background: var(--neon-dim);
}

.about-crew__row:nth-child(1) .about-crew__fill { width: 43.75%; }
.about-crew__row:nth-child(2) .about-crew__fill { width: 28.1%; background: var(--neon); }
.about-crew__row:nth-child(3) .about-crew__fill { width: 28.1%; background: #6E8F84; }

.about-crew__note {
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: 15px;
  color: #40504A;
}

/* ---------- 赛季节点时间线 ---------- */
.about-timeline {
  list-style: none;
  margin: clamp(22px, 3.5vw, 34px) 0 0;
  padding: 0;
}

.about-timeline__item {
  position: relative;
  margin-left: 7px;
  padding: 0 0 clamp(22px, 3vw, 32px) clamp(20px, 3vw, 30px);
  border-left: 1px solid var(--line-soft);
}

.about-timeline__item:last-child {
  padding-bottom: 0;
}

.about-timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 0 4px rgba(75, 227, 176, .14);
}

.about-timeline__season {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--amber);
}

.about-timeline__body h3 {
  margin: 0 0 6px;
  font-size: 17px;
  letter-spacing: -.005em;
  color: var(--white);
}

.about-timeline__body p {
  margin: 0;
  font-size: 15px;
  color: var(--scroll-text);
}

/* ---------- 数据合作与终端 ---------- */
.about-wide {
  margin: 0 0 clamp(20px, 3vw, 30px);
}

.about-tools {
  margin-top: clamp(6px, 1.5vw, 12px);
}

.about-tools__bar {
  margin-bottom: clamp(16px, 2.5vw, 24px);
}

.about-partners {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

@media (min-width: 700px) {
  .about-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(20px, 3vw, 36px);
  }
}

.about-partner {
  padding: clamp(14px, 2.2vw, 20px) 0;
  border-bottom: 1px solid var(--line);
}

.about-partner[hidden] {
  display: none;
}

.about-partner__no {
  display: block;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--neon-dim);
}

.about-partner h3 {
  margin: 6px 0 6px;
  font-size: 17px;
  letter-spacing: -.005em;
  color: var(--white);
}

.about-partner p {
  margin: 0;
  font-size: 15px;
  color: var(--scroll-text);
}

.about-clients {
  list-style: none;
  margin: clamp(14px, 2vw, 20px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.about-clients li {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.about-clients__k {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--amber);
}

.about-clients__v {
  font-size: 15px;
  color: var(--scroll-text);
}

/* ---------- 结尾引导 ---------- */
.about-cta {
  margin-top: clamp(34px, 6vw, 64px);
  padding-top: clamp(28px, 4vw, 44px);
  border-top: 1px solid var(--line);
}

.about-cta h2 {
  margin: 0 0 12px;
  font-size: clamp(21px, 3vw, 30px);
  line-height: 1.25;
  letter-spacing: -.01em;
  color: var(--white);
}

.about-cta p {
  margin: 0 0 22px;
  max-width: 54ch;
  font-size: 15.5px;
  color: var(--scroll-text);
}

@media (max-width: 520px) {
  .about-points li {
    grid-template-columns: 46px minmax(0, 1fr);
    gap: 10px;
  }

  .about-clients li {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .about-dist__row {
    grid-template-columns: minmax(0, 1fr) 54px;
  }

  .about-crew__num {
    font-size: 17px;
  }
}