.page-about {
  --a-rail: 58px;
  --a-gap: clamp(22px, 4vw, 44px);
  --a-pad: clamp(52px, 8vw, 96px);
  display: block;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

@media (min-width: 720px) {
  .page-about {
    --a-rail: 92px;
  }
}

.page-about .mono {
  font-family: var(--font-mono);
  letter-spacing: .01em;
}

.page-about a:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding: 20px 0 0;
  font-size: 13px;
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .breadcrumb__link {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .breadcrumb__link:hover {
  color: var(--blue);
  border-bottom-color: var(--blue);
}

.page-about .breadcrumb__current {
  color: var(--ink);
  font-weight: 500;
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-strong);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(1100px 420px at 84% -12%, rgba(58, 124, 165, .20), transparent 62%),
    radial-gradient(760px 340px at 4% 110%, rgba(217, 160, 91, .18), transparent 60%),
    linear-gradient(180deg, #FFFFFF 0%, #F2F4F7 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(58, 124, 165, .07) 0 1px, transparent 1px 80px),
    repeating-linear-gradient(0deg, rgba(58, 124, 165, .07) 0 1px, transparent 1px 80px);
}

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

.page-about .about-hero__inner {
  display: grid;
  gap: var(--a-gap);
  padding: clamp(34px, 6vw, 62px) 0 clamp(44px, 7vw, 84px);
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.3fr) minmax(300px, .7fr);
    align-items: end;
  }
}

.page-about .eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--gold-ink);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  max-width: 17ch;
  font-family: var(--font-head);
  font-weight: 500;
  font-size: clamp(30px, 6.4vw, 56px);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .about-hero__mark {
  color: var(--rust);
  background-image: linear-gradient(90deg, rgba(217, 160, 91, .55), rgba(184, 92, 56, .3));
  background-repeat: no-repeat;
  background-size: 100% .17em;
  background-position: 0 90%;
}

.page-about .about-hero__desc {
  margin: 0;
  max-width: 56ch;
  color: var(--ink-soft);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__panel {
  position: relative;
  padding: 20px;
  background: var(--paper);
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow-2);
}

.page-about .about-hero__panel::before {
  content: "";
  display: block;
  height: 3px;
  margin: -20px -20px 18px;
  background: linear-gradient(90deg, var(--blue), var(--gold) 55%, var(--rust));
}

.page-about .about-hero__panel-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--ink-soft);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.page-about .about-hero__stat {
  padding: 14px 12px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__stat dt {
  margin: 0 0 4px;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--ink-soft);
}

.page-about .about-hero__stat dd {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(20px, 2.8vw, 28px);
  line-height: 1.2;
  color: var(--blue-deep);
}

/* ---------- 章节通用 ---------- */
.page-about .section {
  padding: var(--a-pad) 0;
}

.page-about .section--paper {
  background: var(--paper);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .section-head {
  position: relative;
  padding-left: 16px;
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .section-head::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  bottom: 5px;
  width: 3px;
  background: linear-gradient(180deg, var(--blue), var(--gold));
}

.page-about .section-index {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .18em;
  color: var(--gold-ink);
}

.page-about .section-title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 500;
  font-size: clamp(23px, 3.6vw, 34px);
  line-height: 1.28;
  color: var(--ink);
}

.page-about .section-desc {
  margin: 0;
  max-width: 68ch;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.9;
}

/* ---------- 图片容器 ---------- */
.page-about .img-frame {
  margin: 0;
  overflow: hidden;
  background: var(--paper);
  border: 1px solid var(--line-strong);
}

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

.page-about .img-frame__cap {
  padding: 10px 13px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--ink-soft);
}

/* ---------- 01 品牌起源 ---------- */
.page-about .about-origin {
  display: grid;
  gap: var(--a-gap);
}

@media (min-width: 940px) {
  .page-about .about-origin {
    grid-template-columns: minmax(0, 1fr) minmax(0, .88fr);
    align-items: start;
  }
}

.page-about .about-origin__text p {
  margin: 0 0 16px;
  color: var(--ink-soft);
  line-height: 1.9;
}

.page-about .about-origin__list {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-origin__list li {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .about-origin__list .mono {
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--blue);
  padding-top: 1px;
}

/* ---------- 02 时间线 ---------- */
.page-about .a-timeline {
  border-top: 1px solid var(--line-strong);
}

.page-about .a-tl-row {
  position: relative;
  display: grid;
  grid-template-columns: var(--a-rail) minmax(0, 1fr);
  border-bottom: 1px solid var(--line);
}

.page-about .a-tl-row::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--blue), var(--gold));
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--dur) var(--ease);
}

@media (min-width: 900px) {
  .page-about .a-tl-row:hover::before,
  .page-about .a-tl-row:focus-within::before {
    transform: scaleY(1);
  }
}

.page-about .a-tl-year {
  position: relative;
  padding: 22px 16px 22px 14px;
  border-right: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(15px, 2.3vw, 23px);
  line-height: 1.35;
  color: var(--blue);
}

.page-about .a-tl-year::after {
  content: "";
  position: absolute;
  right: -4px;
  top: 36px;
  width: 7px;
  height: 7px;
  background: var(--paper);
  border: 1px solid var(--gold);
  transform: rotate(45deg);
}

.page-about .a-tl-body {
  padding: 22px 0 22px 18px;
}

@media (min-width: 720px) {
  .page-about .a-tl-body {
    padding-left: 30px;
  }
}

.page-about .a-tl-title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 500;
  font-size: clamp(17px, 2.2vw, 21px);
  line-height: 1.42;
  color: var(--ink);
}

.page-about .a-tl-text {
  margin: 0;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .a-tl-more {
  margin-top: 10px;
  overflow: hidden;
}

.page-about .a-tl-more p {
  margin: 0;
  padding-left: 13px;
  border-left: 2px solid var(--line-strong);
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-soft);
}

@media (min-width: 900px) {
  .page-about .a-tl-more {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    transition:
      max-height var(--dur) var(--ease),
      opacity var(--dur) var(--ease),
      margin-top var(--dur) var(--ease);
  }

  .page-about .a-tl-row:hover .a-tl-more,
  .page-about .a-tl-row:focus-within .a-tl-more {
    max-height: 200px;
    margin-top: 10px;
    opacity: 1;
  }
}

/* ---------- 03 区域布局 ---------- */
.page-about .about-regions {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

@media (min-width: 960px) {
  .page-about .about-regions {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    grid-template-areas:
      "map grid"
      "figs grid";
    align-items: start;
  }

  .page-about .about-regions__map { grid-area: map; }
  .page-about .about-region-grid { grid-area: grid; }
  .page-about .about-figures { grid-area: figs; }
}

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

@media (min-width: 620px) {
  .page-about .about-region-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-about .about-region-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-region {
  padding: 15px 14px 16px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 3px solid var(--a-region, var(--blue));
  transition:
    transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.page-about .about-region:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
  border-color: var(--line-strong);
}

.page-about .about-region--north { --a-region: var(--r-north); }
.page-about .about-region--east { --a-region: var(--r-east); }
.page-about .about-region--south { --a-region: var(--r-south); }
.page-about .about-region--central { --a-region: var(--r-central); }
.page-about .about-region--southwest { --a-region: var(--r-southwest); }
.page-about .about-region--northwest { --a-region: var(--r-northwest); }
.page-about .about-region--northeast { --a-region: var(--r-northeast); }

.page-about .about-region__name {
  margin: 0 0 4px;
  font-family: var(--font-head);
  font-weight: 500;
  font-size: 17px;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-region__hub {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .02em;
  color: var(--ink-soft);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1px;
  margin-top: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-figures .stat {
  padding: 16px 14px;
  background: var(--paper);
}

.page-about .about-figures .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(21px, 3vw, 29px);
  line-height: 1.2;
  color: var(--blue-deep);
}

.page-about .about-figures .stat__label {
  display: block;
  margin-top: 5px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-soft);
}

/* ---------- 04 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: var(--a-gap);
}

@media (min-width: 940px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, .8fr);
    align-items: start;
  }
}

.page-about .about-team__lede p {
  margin: 0 0 22px;
  color: var(--ink-soft);
  line-height: 1.9;
}

.page-about .about-team__meters {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-meter {
  padding: 16px 14px;
  background: var(--paper);
}

.page-about .about-meter__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.2;
  color: var(--rust);
}

.page-about .about-meter__label {
  display: block;
  margin-top: 5px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-soft);
}

/* ---------- 05 标准与资质 ---------- */
.page-about .about-standards {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-standards li {
  display: grid;
  grid-template-columns: minmax(72px, 96px) minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
  align-items: start;
}

@media (min-width: 720px) {
  .page-about .about-standards li {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 28px;
    padding: 24px 0;
  }
}

.page-about .about-standards__k {
  font-family: var(--font-mono);
  font-size: clamp(15px, 2vw, 20px);
  font-weight: 500;
  line-height: 1.4;
  color: var(--gold-ink);
  padding-top: 2px;
}

.page-about .about-standards__t {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-weight: 500;
  font-size: clamp(17px, 2.2vw, 20px);
  line-height: 1.45;
  color: var(--ink);
}

.page-about .about-standards__d {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------- 06 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  gap: var(--a-gap);
}

@media (min-width: 900px) {
  .page-about .about-partners {
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
    align-items: start;
  }
}

.page-about .about-partners__figures {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-bignum {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 20px 18px;
  background: var(--paper);
}

.page-about .about-bignum__num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1.05;
  color: var(--blue-deep);
  letter-spacing: -.01em;
}

.page-about .about-bignum__plus {
  font-size: .55em;
  color: var(--rust);
  margin-left: 2px;
}

.page-about .about-bignum__label {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--ink-soft);
}

.page-about .about-partners__text p {
  margin: 0 0 20px;
  color: var(--ink-soft);
  line-height: 1.9;
}

.page-about .about-partners__text ul {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-partners__text li {
  padding: 13px 0 13px 20px;
  border-bottom: 1px solid var(--line);
  position: relative;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .about-partners__text li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 21px;
  width: 8px;
  height: 8px;
  background: linear-gradient(135deg, var(--blue), var(--gold));
  transform: rotate(45deg);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  padding: clamp(46px, 7vw, 80px) 0;
  background: var(--ink);
  color: #FFFFFF;
}

.page-about .about-cta__inner {
  display: grid;
  gap: var(--a-gap);
}

@media (min-width: 900px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
    align-items: center;
  }
}

.page-about .about-cta .eyebrow {
  color: var(--gold);
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 500;
  font-size: clamp(24px, 3.8vw, 36px);
  line-height: 1.3;
  color: #FFFFFF;
}

.page-about .about-cta__desc {
  margin: 0;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.9;
  color: rgba(255, 255, 255, .74);
}

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

.page-about .about-cta .btn {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, .42);
  color: #FFFFFF;
  transition:
    background var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    color var(--dur) var(--ease);
}

.page-about .about-cta .btn:hover {
  background: rgba(255, 255, 255, .1);
  border-color: #FFFFFF;
}

.page-about .about-cta .btn--primary {
  background: var(--rust);
  border-color: var(--rust);
  color: #FFFFFF;
}

.page-about .about-cta .btn--primary:hover {
  background: var(--rust-deep);
  border-color: var(--rust-deep);
}

.page-about .about-cta a:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}
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