.page-about {
  --about-pad: clamp(44px, 7vw, 92px);
  --about-card-shadow: 0 22px 48px -38px rgba(14, 42, 74, .6);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 26px 0 0;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
  margin-top: 22px;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(30px, 5.6vw, 54px);
  line-height: 1.16;
  font-weight: 800;
  letter-spacing: -.015em;
  color: var(--ink);
}

.page-about .about-hero__lede {
  margin: 16px 0 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-hero__actions {
  margin-top: 24px;
}

.page-about .about-hero__media {
  margin: 0;
}

.page-about .about-hero__media .media-frame {
  border-radius: var(--radius-l);
  overflow: hidden;
  box-shadow: var(--about-card-shadow);
}

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

/* ---------- 章节索引 + 关键数据 ---------- */
.page-about .about-preface {
  display: grid;
  gap: 28px;
  margin-top: 40px;
  padding-top: 30px;
  border-top: 1px solid var(--gold-line);
}

.page-about .about-index__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .24em;
  color: var(--mist);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-index__list a {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 11px 2px;
  border-bottom: 1px solid var(--line-soft);
  color: var(--ink);
  text-decoration: none;
  font-size: 15px;
  transition: color .25s ease, padding-left .25s ease, border-color .25s ease;
}

.page-about .about-index__list a:hover {
  color: var(--ice-deep);
  border-color: var(--gold);
  padding-left: 10px;
}

.page-about .about-index__list .num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--gold);
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-facts li {
  padding: 14px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-facts__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ice-deep);
}

.page-about .about-facts__label {
  display: block;
  margin-top: 4px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--gold-line);
}

.page-about .about-chapter__head {
  max-width: 760px;
}

.page-about .about-chapter__head .section__title {
  margin: 12px 0 0;
  font-size: clamp(23px, 3.2vw, 34px);
  line-height: 1.32;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-chapter__head .section__note {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-split {
  display: grid;
  gap: 22px;
  margin-top: 34px;
}

.page-about .about-split__lead {
  padding: 24px;
}

.page-about .about-split__body {
  display: grid;
  gap: 20px;
  min-width: 0;
}

.page-about .about-lead {
  margin: 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink);
}

.page-about .about-coord {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-coord li {
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-coord li:first-child {
  padding-top: 0;
}

.page-about .about-coord li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-coord__k {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--mist);
}

.page-about .about-coord__v {
  display: block;
  margin-top: 5px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ice-deep);
}

.page-about .about-audience {
  display: grid;
  gap: 14px;
}

.page-about .about-audience__item {
  padding: 20px;
}

.page-about .about-audience__item h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-audience__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 时间轴 ---------- */
.page-about .tl {
  margin-top: 36px;
}

.page-about .tl__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
  position: relative;
  display: grid;
  gap: 26px;
}

.page-about .tl__list::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--gold-line);
}

.page-about .tl__item {
  position: relative;
  display: grid;
  gap: 10px;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--white);
  border: 1px solid var(--gold);
  box-shadow: 0 0 0 3px rgba(238, 244, 251, .9);
}

.page-about .tl__stage {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .tl__year {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--ice-deep);
}

.page-about .tl__version {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--gold);
  border: 1px solid var(--gold-line);
  border-radius: 999px;
  padding: 2px 9px;
}

.page-about .tl__card {
  padding: 20px;
  background: var(--white);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  box-shadow: var(--about-card-shadow);
  transition: transform .35s ease, border-color .35s ease;
}

.page-about .tl__card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .tl__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .tl__more {
  margin-top: 10px;
  color: var(--ice-deep);
}

/* ---------- 图片通用 ---------- */
.page-about .about-figure {
  margin: 34px 0 0;
}

.page-about .about-figure .media-frame,
.page-about .net__figure .media-frame {
  border-radius: var(--radius-l);
  overflow: hidden;
  box-shadow: var(--about-card-shadow);
}

.page-about .about-figure img,
.page-about .net__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 服务网络 ---------- */
.page-about .net {
  margin-top: 34px;
  display: grid;
  gap: 26px;
}

.page-about .net__figure {
  margin: 0;
}

.page-about .net__regions {
  display: grid;
  gap: 12px;
}

.page-about .net-region {
  position: relative;
  padding: 18px 18px 18px 22px;
  background: var(--white);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
}

.page-about .net-region::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 2px;
  border-radius: 2px;
  background: var(--gold-line);
  transition: background .3s ease, top .3s ease, bottom .3s ease;
}

.page-about .net-region:hover {
  transform: translateY(-3px);
  border-color: var(--gold-line);
  box-shadow: var(--about-card-shadow);
}

.page-about .net-region:hover::before {
  background: var(--gold);
  top: 8px;
  bottom: 8px;
}

.page-about .net-region__tag {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--gold);
}

.page-about .net-region h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .net-region p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 团队仪表板 ---------- */
.page-about .dash {
  position: relative;
  overflow: hidden;
  margin-top: 34px;
  padding: 28px 22px;
  background: var(--night);
  color: var(--ice);
  border-radius: var(--radius-l);
}

.page-about .dash::after {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -130px;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(55, 215, 196, .3), transparent 68%);
  pointer-events: none;
}

.page-about .dash__grid {
  position: relative;
  display: grid;
  gap: 16px;
}

.page-about .dash-card {
  padding: 16px 18px;
  border: 1px solid rgba(232, 217, 166, .3);
  border-radius: var(--radius-m);
  background: linear-gradient(180deg, rgba(255, 255, 255, .07), rgba(255, 255, 255, 0));
}

.page-about .dash-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold-light);
}

.page-about .dash-card__label {
  display: block;
  margin-top: 8px;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(238, 244, 251, .84);
}

.page-about .dash__ops {
  position: relative;
  list-style: none;
  margin: 22px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid rgba(232, 217, 166, .26);
  display: grid;
  gap: 12px;
}

.page-about .dash__ops li {
  display: flex;
  gap: 10px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(238, 244, 251, .88);
}

.page-about .dash__ops .num {
  font-family: var(--font-mono);
  font-size: 12px;
  padding-top: 4px;
  color: var(--aurora);
}

/* ---------- 资质 ---------- */
.page-about .cred {
  margin-top: 34px;
  display: grid;
  gap: 14px;
}

.page-about .cred-item {
  display: grid;
  gap: 10px;
  justify-items: start;
  padding: 20px;
  background: var(--white);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  box-shadow: var(--about-card-shadow);
}

.page-about .cred-item h3 {
  margin: 0;
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .cred-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 合作生态 ---------- */
.page-about .eco {
  margin-top: 34px;
  display: grid;
  gap: 16px;
}

.page-about .eco__core {
  padding: 28px 24px;
  border-radius: var(--radius-l);
  background: linear-gradient(150deg, var(--ice-deep), var(--night));
  color: var(--ice);
}

.page-about .eco__core .num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(34px, 5vw, 52px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold-light);
}

.page-about .eco__core p {
  margin: 14px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(238, 244, 251, .86);
}

.page-about .eco__dirs,
.page-about .eco__industries {
  display: grid;
  gap: 12px;
}

.page-about .eco-dir {
  padding: 16px 18px;
  background: var(--white);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
}

.page-about .eco-dir h3 {
  margin: 0 0 6px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .eco-dir p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .ind {
  padding: 16px 18px;
  border: 1px dashed var(--gold-line);
  border-radius: var(--radius-m);
  background: linear-gradient(180deg, var(--white), var(--ice));
}

.page-about .ind h3 {
  margin: 0 0 6px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--ice-deep);
}

.page-about .ind p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-tailnote {
  margin: 24px 0 0;
  padding-left: 18px;
  border-left: 2px solid var(--gold-line);
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  padding: var(--about-pad) 0 44px;
  border-top: 1px solid var(--gold-line);
}

.page-about .about-cta__panel {
  display: grid;
  gap: 22px;
  padding: 28px 22px;
  border-radius: var(--radius-l);
  background: linear-gradient(150deg, var(--ice-deep), var(--night));
  color: var(--ice);
}

.page-about .about-cta__title {
  margin: 0;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.35;
  font-weight: 700;
}

.page-about .about-cta__text {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(238, 244, 251, .86);
  max-width: 46em;
}

/* ---------- 640px 起 ---------- */
@media (min-width: 640px) {
  .page-about .net__regions,
  .page-about .eco__dirs,
  .page-about .eco__industries,
  .page-about .cred,
  .page-about .dash__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-audience {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-audience__item:first-child {
    grid-column: 1 / -1;
  }

  .page-about .about-cta__panel {
    padding: 34px 30px;
  }
}

/* ---------- 900px 起 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, .96fr);
    gap: 46px;
    align-items: center;
  }

  .page-about .about-preface {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    gap: 48px;
  }

  .page-about .about-facts {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 26px;
  }

  .page-about .about-facts li {
    padding: 12px 0;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, .84fr) minmax(0, 1.16fr);
    gap: 46px;
    align-items: start;
  }

  .page-about .about-split__lead {
    padding: 28px;
    position: sticky;
    top: 84px;
  }

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

  .page-about .about-audience__item:first-child {
    grid-column: auto;
  }

  /* 时间轴：左侧留白宽于右侧节点卡片 */
  .page-about .tl__list {
    padding-left: 0;
  }

  .page-about .tl__list::before {
    left: 50%;
    top: 10px;
    bottom: 10px;
  }

  .page-about .tl__item {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 0;
    align-items: start;
  }

  .page-about .tl__item::before {
    left: calc(50% - 5px);
    top: 12px;
  }

  .page-about .tl__stage {
    flex-direction: column;
    align-items: flex-end;
    justify-content: flex-start;
    gap: 8px;
    padding: 4px 38px 0 0;
  }

  .page-about .tl__card {
    grid-column: 2;
    margin-left: 38px;
  }

  .page-about .tl__more {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height .4s ease, opacity .35s ease, margin-top .4s ease;
  }

  .page-about .tl__item:hover .tl__more,
  .page-about .tl__item:focus-within .tl__more {
    max-height: 200px;
    margin-top: 10px;
    opacity: 1;
  }

  .page-about .tl__item:hover .tl__card {
    transform: translateY(-3px);
    border-color: var(--gold-line);
  }

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

  .page-about .dash {
    padding: 34px 30px;
  }

  .page-about .dash__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .eco {
    grid-template-columns: minmax(0, .84fr) minmax(0, 1.16fr);
    gap: 18px 28px;
  }

  .page-about .eco__core {
    grid-row: 1 / span 2;
    padding: 32px 28px;
  }

  .page-about .about-cta__panel {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
    align-items: center;
    gap: 32px;
    padding: 40px 36px;
  }

  .page-about .about-cta__links {
    justify-content: flex-end;
  }
}