.page-about {
  --about-cut: 18px;
  --about-cut-sm: 12px;
  background: var(--mist);
  color: var(--ink);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 22px 0 0;
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(127, 200, 232, 0.16) 0%, rgba(245, 248, 251, 0) 68%),
    var(--mist);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  left: -12%;
  right: -12%;
  top: -30%;
  height: 170%;
  pointer-events: none;
  z-index: 0;
  background-image:
    repeating-radial-gradient(ellipse 68% 58% at 78% 10%, transparent 0 44px, rgba(10, 110, 189, 0.10) 44px 45px),
    repeating-radial-gradient(ellipse 58% 48% at 10% 82%, transparent 0 58px, rgba(200, 16, 46, 0.06) 58px 59px);
  opacity: 0.85;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  padding-top: 8px;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 20px;
}

.page-about .about-hero .eyebrow {
  margin-bottom: 12px;
}

.page-about .about-hero h1 {
  font-size: clamp(30px, 6.4vw, 52px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  font-weight: 900;
  max-width: 20em;
  margin: 0 0 18px;
}

.page-about .about-lede {
  max-width: 36em;
  font-size: 17px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 24px;
}

.page-about .about-hero-facts {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-hero-facts li {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.01em;
  color: var(--sky);
  background: rgba(10, 110, 189, 0.08);
  border: 1px solid rgba(10, 110, 189, 0.22);
  padding: 7px 12px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
}

.page-about .about-hero-media {
  position: relative;
  z-index: 1;
  margin: 0;
  padding: 0 18px;
}

.page-about .about-hero-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: var(--maxw);
  margin: 0 auto;
  aspect-ratio: 16 / 6;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

/* ---------- 通用节奏 ---------- */

.page-about .about-section-intro {
  max-width: 34em;
  margin: 10px 0 0;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .about-team h2,
.page-about .about-versions h2,
.page-about .about-reach h2,
.page-about .about-partners h2,
.page-about .about-awards h2,
.page-about .about-next h2,
.page-about .about-claim h2 {
  font-size: clamp(24px, 4.2vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 900;
  margin: 8px 0 18px;
}

/* ---------- 品牌主张 ---------- */

.page-about .about-claim-grid {
  display: grid;
  gap: 34px;
}

.page-about .about-claim-main p {
  max-width: 34em;
  margin: 0 0 18px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-claim-side {
  padding: 22px 20px 18px;
  background: var(--white);
}

.page-about .about-side-title {
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 16px;
  letter-spacing: -0.01em;
}

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

.page-about .about-side-list li {
  padding: 12px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-side-list li:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-side-list a {
  display: block;
  font-weight: 700;
  font-size: 15px;
  color: var(--ink);
  text-decoration: none;
  line-height: 1.5;
}

.page-about .about-side-list a:hover,
.page-about .about-side-list a:focus-visible {
  color: var(--sky);
}

.page-about .about-side-list .index-num {
  color: var(--gold-deep);
  margin-right: 8px;
  font-size: 12px;
}

.page-about .about-side-list p {
  margin: 6px 0 0 26px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--rock);
}

/* ---------- 版本演进阶梯 ---------- */

.page-about .about-stair-wrap {
  margin-top: 28px;
}

.page-about .about-stair {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  padding: 6px 2px 22px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-step {
  flex: 0 0 82%;
  scroll-snap-align: start;
  background: var(--white);
  border: 1px solid var(--line);
  padding: 20px 18px 16px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-step:nth-child(2) {
  margin-top: 16px;
  border-top: 2px solid var(--glacier);
}

.page-about .about-step:nth-child(3) {
  margin-top: 32px;
  border-top: 2px solid var(--saffron);
}

.page-about .about-step-num {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold-deep);
}

.page-about .about-step-ver {
  margin: 0 0 10px;
  font-size: 30px;
  line-height: 1;
  font-weight: 700;
  color: var(--sky);
  letter-spacing: -0.01em;
}

.page-about .about-step-title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
}

.page-about .about-step-text {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-fold {
  border-top: 1px solid var(--line);
}

.page-about .about-fold > summary {
  cursor: pointer;
  list-style: none;
  padding: 12px 0 6px;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--ink-soft);
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-fold > summary::-webkit-details-marker {
  display: none;
}

.page-about .about-fold > summary::before {
  content: "+";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  flex: 0 0 18px;
  color: var(--white);
  background: var(--sky);
  font-size: 13px;
  line-height: 1;
}

.page-about .about-fold[open] > summary::before {
  content: "–";
  background: var(--saffron);
}

.page-about .about-fold .fold-body ul {
  list-style: none;
  margin: 6px 0 8px;
  padding: 0;
}

.page-about .about-fold .fold-body li {
  position: relative;
  padding: 7px 0 7px 16px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-soft);
  border-top: 1px dashed var(--line);
}

.page-about .about-fold .fold-body li:first-child {
  border-top: 0;
}

.page-about .about-fold .fold-body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 15px;
  width: 6px;
  height: 6px;
  background: var(--glacier);
}

.page-about .about-version-figure {
  margin: 8px 0 0;
}

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

.page-about .about-version-figure img {
  aspect-ratio: 3 / 2;
}

/* ---------- 团队 ---------- */

.page-about .about-team-grid {
  display: grid;
  gap: 34px;
}

.page-about .about-team-copy > p {
  max-width: 34em;
  margin: 0 0 22px;
  line-height: 1.85;
  color: var(--ink-soft);
}

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

.page-about .about-role {
  display: grid;
  grid-template-columns: 4px 1fr;
  gap: 16px;
  align-items: stretch;
}

.page-about .about-role-bar {
  display: block;
  background: var(--sky);
}

.page-about .about-role:nth-child(2) .about-role-bar {
  background: var(--glacier);
}

.page-about .about-role:nth-child(3) .about-role-bar {
  background: var(--green);
}

.page-about .about-role:nth-child(4) .about-role-bar {
  background: var(--gold);
}

.page-about .about-role h3 {
  margin: 0 0 5px;
  font-size: 16px;
  font-weight: 700;
}

.page-about .about-role p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .about-team-figure {
  margin: 0;
}

.page-about .about-team-figure img {
  aspect-ratio: 1 / 1;
}

/* ---------- 覆盖范围数字带 ---------- */

.page-about .about-stats {
  margin-top: 26px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stat {
  background: var(--mist);
  padding: 18px 16px 16px;
}

.page-about .about-stat-num {
  margin: 0 0 8px;
  font-size: 30px;
  line-height: 1;
  font-weight: 700;
  color: var(--sky);
  letter-spacing: -0.02em;
}

.page-about .about-stat-unit {
  font-size: 15px;
  margin-left: 2px;
  color: var(--rock);
}

.page-about .about-stat-label {
  margin: 0 0 4px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-stat-note {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--rock);
}

/* ---------- 协作生态 ---------- */

.page-about .about-partners-grid {
  display: grid;
  gap: 26px;
}

.page-about .about-partners-copy {
  padding: 24px 20px;
  background: var(--white);
}

.page-about .about-partners-copy p {
  max-width: 34em;
  margin: 0 0 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-partner-points {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
}

.page-about .about-partner-points li {
  padding: 10px 0;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .about-partner-points .mono {
  display: inline-block;
  min-width: 4.2em;
  color: var(--sky);
  font-size: 12.5px;
  letter-spacing: 0.08em;
}

/* ---------- 行业认可 ---------- */

.page-about .about-awards-inner {
  max-width: 46em;
}

.page-about .about-awards-lead {
  font-size: clamp(19px, 3vw, 26px);
  line-height: 1.6;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 16px;
}

.page-about .about-awards-num {
  color: var(--saffron);
  font-size: 1.15em;
}

.page-about .about-awards-text {
  max-width: 34em;
  margin: 0;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------- 下一步 ---------- */

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

.page-about .about-next-card {
  display: block;
  text-decoration: none;
  color: var(--ink);
  background: var(--white);
  border: 1px solid var(--line);
  padding: 18px 18px 16px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut-sm)), calc(100% - var(--about-cut-sm)) 100%, 0 100%);
  transition: transform 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-next-card .index-num {
  display: block;
  font-size: 12px;
  color: var(--gold-deep);
  margin-bottom: 8px;
  letter-spacing: 0.14em;
}

.page-about .about-next-card strong {
  display: block;
  font-size: 17px;
  margin-bottom: 6px;
}

.page-about .about-next-card span:last-child {
  display: block;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--rock);
}

.page-about .about-next-card:hover,
.page-about .about-next-card:focus-visible {
  border-color: var(--saffron);
  transform: translateY(-2px);
}

/* ---------- 平板 ---------- */

@media (min-width: 720px) {
  .page-about .about-hero {
    padding-top: 32px;
  }

  .page-about .about-hero-media {
    padding: 0 24px;
  }

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

  .page-about .about-next-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-step {
    padding: 24px 22px 18px;
  }
}

/* ---------- 桌面 ---------- */

@media (min-width: 960px) {
  .page-about .about-claim-grid {
    grid-template-columns: 62fr 38fr;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-claim-side {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .about-stair {
    overflow: visible;
    gap: 20px;
    padding-bottom: 30px;
  }

  .page-about .about-step {
    flex: 1 1 0;
    min-width: 0;
  }

  .page-about .about-step:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .about-step:nth-child(3) {
    margin-top: 52px;
  }

  .page-about .about-team-grid {
    grid-template-columns: 62fr 38fr;
    gap: 52px;
    align-items: start;
  }

  .page-about .about-partners-grid {
    grid-template-columns: 34fr 66fr;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-partners-rail {
    padding-top: 6px;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-stat {
    padding: 22px 18px 20px;
  }

  .page-about .about-stat-num {
    font-size: 34px;
  }

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

  .page-about .about-version-figure {
    max-width: 1000px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-claim-grid {
    gap: 64px;
  }

  .page-about .about-team-grid {
    gap: 64px;
  }
}

/* ---------- 减少动态偏好 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-next-card {
    transition: none;
  }

  .page-about .about-next-card:hover,
  .page-about .about-next-card:focus-visible {
    transform: none;
  }
}