.page-about {
  --about-ring: rgba(255, 106, 19, .13);
}

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

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(120% 92% at 84% 6%, rgba(30, 111, 217, .42), transparent 62%),
    linear-gradient(158deg, #0B1B33 0%, #0A1730 60%, #0D2244 100%);
  color: var(--white);
  padding: clamp(24px, 4vw, 44px) 0 clamp(46px, 6vw, 86px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  left: -8%;
  right: -8%;
  bottom: -70px;
  height: 190px;
  background: linear-gradient(90deg, rgba(255, 106, 19, .22), rgba(22, 194, 166, .16) 68%, transparent);
  transform: rotate(-6deg);
  pointer-events: none;
}

.page-about .about-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45em;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, .56);
}

.page-about .about-crumbs a {
  color: rgba(255, 255, 255, .74);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-crumbs a:hover {
  color: var(--orange-soft);
  border-bottom-color: var(--orange-soft);
}

.page-about .about-crumbs__sep {
  color: rgba(255, 255, 255, .3);
}

.page-about .about-hero__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(22px, 3.4vw, 38px);
  align-items: end;
}

.page-about .about-hero__copy .chapter-num {
  color: var(--orange-soft);
}

.page-about .about-hero__title {
  margin: .3em 0 .55em;
  font-size: clamp(30px, 5.4vw, 56px);
  line-height: 1.12;
  letter-spacing: -.02em;
  font-weight: 900;
  color: var(--white);
  max-width: 15em;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 34em;
  font-size: clamp(15px, 1.1vw, 17px);
  line-height: 1.82;
  color: rgba(255, 255, 255, .78);
}

.page-about .about-hero__act {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 2.6vw, 30px);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
  padding: 0;
}

.page-about .about-fact {
  padding: clamp(14px, 1.8vw, 20px);
  background: rgba(255, 255, 255, .06);
  border: 1px solid var(--line-inv);
  clip-path: var(--cut-sm);
}

.page-about .about-fact dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: rgba(255, 255, 255, .55);
}

.page-about .about-fact dd {
  margin: .55em 0 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1;
  color: var(--white);
}

.page-about .about-fact__u {
  font-size: .5em;
  margin-left: 4px;
  color: var(--orange-soft);
  letter-spacing: .04em;
}

/* ============ 章节头通用 ============ */
.page-about .sec-head__num {
  color: var(--orange);
  font-family: var(--font-mono);
}

.page-about .sec-head__title {
  letter-spacing: -.01em;
  line-height: 1.28;
}

/* ============ 01 起点 ============ */
.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
  margin-top: clamp(22px, 3.2vw, 40px);
}

.page-about .about-origin__prose p {
  max-width: 34em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-origin__prose p + p {
  margin-top: 1.1em;
}

.page-about .about-origin__aside {
  position: relative;
  padding: clamp(20px, 2.6vw, 28px);
  background: linear-gradient(155deg, #FFFFFF, var(--mist));
  border: 1px solid var(--line-soft);
  clip-path: var(--cut);
}

.page-about .about-origin__aside::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--orange), var(--orange-soft));
}

.page-about .about-origin__kicker {
  margin: 0 0 1em;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--gray);
}

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

.page-about .about-pain li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink);
}

.page-about .about-pain li + li {
  margin-top: .85em;
}

.page-about .about-pain li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 11px;
  height: 2px;
  background: var(--orange);
}

/* ============ 02 时间轴 ============ */
.page-about .tl {
  position: relative;
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 13px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--orange), var(--cyan) 62%, rgba(11, 27, 51, .1));
}

.page-about .tl__item {
  position: relative;
  padding: 0 0 clamp(22px, 3vw, 34px) 52px;
}

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

.page-about .tl__node {
  position: absolute;
  left: 0;
  top: 30px;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--white);
  border: 2px solid var(--orange);
  box-shadow: 0 0 0 4px var(--about-ring);
  transition: border-color .26s var(--ease), box-shadow .26s var(--ease);
}

.page-about .tl__node::after {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--orange);
  transition: transform .26s var(--ease), background-color .26s var(--ease);
}

.page-about .tl__item:hover .tl__node,
.page-about .tl__item:focus-within .tl__node {
  border-color: var(--cyan);
  box-shadow: 0 0 0 6px rgba(22, 194, 166, .18);
}

.page-about .tl__item:hover .tl__node::after,
.page-about .tl__item:focus-within .tl__node::after {
  transform: scale(1.45);
  background: var(--cyan);
}

.page-about .tl__card {
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--white);
  border: 1px solid var(--line-soft);
  clip-path: var(--cut-sm);
  box-shadow: 0 12px 32px -26px rgba(11, 27, 51, .58);
  transition: transform .24s var(--ease), box-shadow .24s var(--ease);
}

.page-about .tl__item:hover .tl__card,
.page-about .tl__item:focus-within .tl__card {
  transform: translateY(-3px);
  box-shadow: 0 20px 44px -28px rgba(11, 27, 51, .6);
}

.page-about .tl__year {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3.2vw, 32px);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--navy-2);
}

.page-about .tl__card .tag {
  display: inline-block;
  margin: 0 0 10px;
}

.page-about .tl__title {
  margin: 0 0 .55em;
  font-size: clamp(18px, 2vw, 21px);
  line-height: 1.4;
  font-weight: 800;
  color: var(--ink);
}

.page-about .tl__desc {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.82;
  color: var(--ink);
}

.page-about .tl__media {
  margin: 16px 0 0;
}

.page-about .tl__media img {
  width: 100%;
  border: 1px solid var(--line-soft);
}

/* ============ 03 内容与数据 ============ */
.page-about .about-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 1.8vw, 20px);
  margin-top: clamp(24px, 3.4vw, 44px);
}

.page-about .about-flow__step {
  padding: clamp(20px, 2.4vw, 26px);
  background: var(--white);
  border: 1px solid var(--line-soft);
  border-top: 3px solid var(--blue);
  clip-path: var(--cut-sm);
}

.page-about .about-flow__step:nth-child(1) { border-top-color: var(--orange); }
.page-about .about-flow__step:nth-child(2) { border-top-color: var(--blue); }
.page-about .about-flow__step:nth-child(3) { border-top-color: var(--cyan); }
.page-about .about-flow__step:nth-child(4) { border-top-color: var(--navy-2); }

.page-about .about-flow__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gray);
}

.page-about .about-flow__step:nth-child(1) .about-flow__idx { color: var(--orange); }
.page-about .about-flow__step:nth-child(2) .about-flow__idx { color: var(--blue); }
.page-about .about-flow__step:nth-child(3) .about-flow__idx { color: var(--cyan); }
.page-about .about-flow__step:nth-child(4) .about-flow__idx { color: var(--navy-2); }

.page-about .about-flow__title {
  margin: .9em 0 .6em;
  font-size: clamp(17px, 1.8vw, 19px);
  line-height: 1.4;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--gray);
}

/* ============ 04 团队 ============ */
.page-about .about-team__figure {
  margin: clamp(24px, 3.4vw, 42px) 0 0;
}

.page-about .about-team__figure figcaption,
.page-about .about-partners__figure figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--gray);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 1.8vw, 20px);
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-team__card {
  position: relative;
  padding: clamp(20px, 2.5vw, 28px);
  background: var(--white);
  border: 1px solid var(--line-soft);
  clip-path: var(--cut-sm);
  transition: transform .24s var(--ease), box-shadow .24s var(--ease), border-color .24s var(--ease);
}

.page-about .about-team__card::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 0;
  height: 3px;
  background: var(--orange);
  transition: width .32s var(--ease);
}

.page-about .about-team__card:hover,
.page-about .about-team__card:focus {
  outline: none;
  transform: translateY(-4px);
  border-color: var(--line);
  box-shadow: 0 20px 46px -30px rgba(11, 27, 51, .62);
}

.page-about .about-team__card:hover::after,
.page-about .about-team__card:focus::after {
  width: 100%;
}

.page-about .about-team__num {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1;
  color: var(--blue);
}

.page-about .about-team__num span {
  font-size: .36em;
  margin-left: 6px;
  letter-spacing: .08em;
  color: var(--gray);
}

.page-about .about-team__role {
  margin: .65em 0 0;
  font-size: 17px;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-team__duty {
  margin: .7em 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--gray);
}

.page-about .about-team__sum {
  margin: clamp(16px, 2vw, 24px) 0 0;
  padding-left: 14px;
  border-left: 3px solid var(--cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--gray);
}

/* ============ 05 合作与认可 ============ */
.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 3.6vw, 52px);
  align-items: start;
}

.page-about .about-honors {
  list-style: none;
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-honors li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 14px;
  padding: 14px 18px;
  background: var(--mist);
  border-left: 3px solid var(--orange);
  clip-path: var(--cut-sm);
}

.page-about .about-honors__year {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--orange);
}

.page-about .about-honors__text {
  font-size: 15px;
  color: var(--ink);
}

.page-about .about-partners__note {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-partners__note a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-partners__note a:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

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

/* ============ 06 改版方向 ============ */
.page-about .about-next {
  background:
    radial-gradient(90% 82% at 10% 0%, rgba(30, 111, 217, .38), transparent 62%),
    var(--navy);
  color: var(--white);
}

.page-about .about-next .sec-head__title {
  color: var(--white);
}

.page-about .about-next .sec-head__desc {
  color: rgba(255, 255, 255, .7);
}

.page-about .about-next .sec-head__num {
  color: var(--orange-soft);
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 1.8vw, 20px);
  margin-top: clamp(24px, 3.4vw, 42px);
}

.page-about .about-next__item {
  padding: clamp(20px, 2.5vw, 28px);
  background: rgba(255, 255, 255, .05);
  border: 1px solid var(--line-inv);
  clip-path: var(--cut-sm);
}

.page-about .about-next__item h3 {
  margin: 0 0 .7em;
  font-size: clamp(17px, 1.9vw, 20px);
  line-height: 1.4;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-next__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: rgba(255, 255, 255, .72);
}

.page-about .about-next__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 36px);
}

/* ============ 07 覆盖范围 ============ */
.page-about .about-coverage {
  background: var(--mist);
}

.page-about .about-tabs {
  margin-top: clamp(22px, 3vw, 36px);
}

.page-about .about-tabs .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(18px, 2.4vw, 28px);
}

.page-about .about-tabs .tabs__btn {
  font-family: var(--font-sans);
  font-size: 14px;
  padding: 9px 16px;
  background: var(--white);
  border: 1px solid var(--line);
  color: var(--navy-2);
  clip-path: var(--cut-sm);
  cursor: pointer;
  transition: background-color .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-tabs .tabs__btn:hover {
  border-color: var(--orange);
  color: var(--orange);
}

.page-about .about-tabs .tabs__btn[aria-selected="true"],
.page-about .about-tabs .tabs__btn.is-active {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
  font-weight: 700;
}

.page-about .about-tabs .tabs__panel {
  display: block;
}

.page-about .about-tabs .tabs__panel[hidden] {
  display: none;
}

.page-about .about-cov {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  margin: 0;
  background: var(--white);
  border: 1px solid var(--line-soft);
  clip-path: var(--cut);
}

.page-about .about-cov > div {
  padding: clamp(18px, 2.4vw, 28px);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-cov > div:last-child {
  border-bottom: 0;
}

.page-about .about-cov dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--gray);
}

.page-about .about-cov dd {
  margin: .6em 0 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3.2vw, 36px);
  line-height: 1;
  letter-spacing: .01em;
  color: var(--navy-2);
}

.page-about .about-cov dd span {
  font-size: .42em;
  margin-left: 4px;
  letter-spacing: .06em;
  color: var(--gray);
}

.page-about .about-cov__note {
  margin: clamp(16px, 2vw, 22px) 0 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
}

/* ============ 媒体查询 ============ */
@media (min-width: 700px) {
  .page-about .about-cov {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-cov > div {
    border-bottom: 0;
    border-right: 1px solid var(--line-soft);
  }

  .page-about .about-cov > div:last-child {
    border-right: 0;
  }

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

@media (min-width: 760px) {
  .page-about .about-team__grid,
  .page-about .about-next__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__body {
    grid-template-columns: minmax(0, 1.35fr) minmax(280px, .78fr);
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .85fr);
    gap: clamp(28px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(280px, .85fr);
  }

  .page-about .about-hero__facts {
    gap: 12px;
  }

  .page-about .tl::before {
    left: 50%;
    margin-left: -1px;
  }

  .page-about .tl__item {
    width: 50%;
    padding: 0 clamp(30px, 3.6vw, 50px) clamp(28px, 3.4vw, 44px) 0;
  }

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

  .page-about .tl__item:nth-child(even) {
    margin-left: 50%;
    padding: 0 0 clamp(28px, 3.4vw, 44px) clamp(30px, 3.6vw, 50px);
  }

  .page-about .tl__item:nth-child(even):last-child {
    padding-bottom: 0;
  }

  .page-about .tl__node {
    left: auto;
    right: -14px;
  }

  .page-about .tl__item:nth-child(even) .tl__node {
    right: auto;
    left: -14px;
  }
}

@media (min-width: 1060px) {
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}