.page-about {
  --about-rail: 158px;
  --about-gap: clamp(28px, 5vw, 72px);
  color: var(--ink);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-top: clamp(14px, 3vw, 26px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(24px, 5vw, 52px) clamp(36px, 6vw, 88px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 46px);
  align-items: end;
}

.page-about .about-hero__title {
  margin: 0.4em 0 0.5em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 6.4vw, 60px);
  line-height: 1.05;
  letter-spacing: -0.012em;
  color: var(--ink);
}

.page-about .about-hero__accent {
  color: var(--orange);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 34em;
  color: var(--grey);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
}

.page-about .about-hero__facts {
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--rule);
  background: linear-gradient(155deg, rgba(255, 241, 229, 0.92), rgba(248, 245, 240, 0.72));
  backdrop-filter: blur(10px);
}

.page-about .about-hero__factsTitle {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--grey);
}

.page-about .about-factlist {
  margin: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-factlist__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--rule);
}

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

.page-about .about-factlist dt {
  font-size: 0.84rem;
  color: var(--grey);
}

.page-about .about-factlist dd {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--ink);
  text-align: right;
  overflow-wrap: anywhere;
}

/* ---------- 主体框架：左侧索引 + 右侧内容 ---------- */
.page-about .about-frame {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--grey);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  flex-wrap: nowrap;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 12px;
  border-radius: 999px;
  text-decoration: none;
  color: var(--ink);
  white-space: nowrap;
  transition: background-color 0.16s ease, color 0.16s ease;
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  background: var(--mist);
  color: var(--orange);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--grey);
}

.page-about .about-rail__label {
  font-size: 0.88rem;
  font-weight: 600;
}

/* ---------- 通用区块 ---------- */
.page-about .about-section {
  padding-block: clamp(40px, 7vw, 96px);
  border-top: 1px solid var(--rule);
  scroll-margin-top: calc(var(--header-offset) + 20px);
}

.page-about .about-body > .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-head {
  max-width: 46rem;
}

.page-about .about-head__title {
  margin: 0.35em 0 0.5em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.14;
  letter-spacing: -0.008em;
  color: var(--ink);
}

.page-about .about-head__lede {
  margin: 0 0 clamp(26px, 4vw, 44px);
  max-width: 40em;
  color: var(--grey);
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.8;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(28px, 4vw, 48px) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-lg);
  background: var(--rule);
}

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

.page-about .about-figure__cap {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  line-height: 1.6;
  color: var(--grey);
}

/* ---------- 发展历程 ---------- */
.page-about .stage-list {
  list-style: none;
  margin: 0 0 0 6px;
  padding: 0;
  border-left: 1px solid var(--rule);
}

.page-about .stage {
  position: relative;
  padding: 0 0 clamp(26px, 4vw, 46px) clamp(22px, 3vw, 34px);
}

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

.page-about .stage::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 0.5em;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 4px rgba(18, 179, 154, 0.14);
}

.page-about .stage--now::before {
  background: var(--orange);
  box-shadow: 0 0 0 5px rgba(255, 106, 31, 0.16);
}

.page-about .stage__meta {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--teal);
}

.page-about .stage--now .stage__meta {
  color: var(--orange);
}

.page-about .stage__title {
  margin: 0 0 0.4em;
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  color: var(--ink);
}

.page-about .stage:nth-child(1) .stage__title { font-size: clamp(18px, 2.2vw, 22px); }
.page-about .stage:nth-child(2) .stage__title { font-size: clamp(20px, 2.6vw, 26px); }
.page-about .stage:nth-child(3) .stage__title { font-size: clamp(22px, 3vw, 31px); }
.page-about .stage:nth-child(4) .stage__title { font-size: clamp(24px, 3.4vw, 36px); }

.page-about .stage__text {
  margin: 0;
  max-width: 40em;
  color: var(--grey);
  line-height: 1.8;
}

/* ---------- 谁在使用 ---------- */
.page-about .aud-list {
  display: grid;
}

.page-about .aud {
  display: grid;
  gap: 6px 18px;
  padding: clamp(20px, 3vw, 30px) 0;
  border-top: 1px solid var(--rule);
}

.page-about .aud:last-child {
  border-bottom: 1px solid var(--rule);
}

.page-about .aud__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .aud__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.2vw, 24px);
  color: var(--ink);
}

.page-about .aud__body p {
  margin: 0 0 0.75em;
  max-width: 40em;
  color: var(--grey);
  line-height: 1.8;
}

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

.page-about .aud__note {
  padding-left: 10px;
  border-left: 2px solid var(--peach);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--ink);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .team-steps__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2vw, 22px);
  color: var(--ink);
}

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

.page-about .about-steps li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
}

.page-about .about-steps__num {
  padding-top: 0.24em;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--orange);
}

.page-about .about-steps p {
  margin: 0;
  color: var(--grey);
  line-height: 1.8;
}

.page-about .about-team__note {
  margin: 22px 0 0;
  line-height: 1.9;
}

/* ---------- 资质与合规 ---------- */
.page-about .about-section--mist {
  border-top-color: transparent;
  border-radius: var(--radius-lg);
  padding-inline: clamp(18px, 3.5vw, 44px);
  background: var(--mist);
}

.page-about .trust-grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

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

.page-about .trust-list li {
  display: grid;
  gap: 4px 18px;
  padding: 14px 0;
  border-top: 1px solid rgba(22, 40, 60, 0.1);
}

.page-about .trust-list__key {
  padding-top: 0.25em;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--ink);
}

.page-about .trust-list li p {
  margin: 0;
  color: var(--grey);
  line-height: 1.75;
}

/* ---------- 合作与生态 ---------- */
.page-about .partner-band {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  padding: clamp(20px, 3.5vw, 36px);
  border-radius: var(--radius-lg);
  background: linear-gradient(150deg, var(--mist), rgba(255, 241, 229, 0.35));
}

.page-about .partner-band__glass {
  padding: clamp(18px, 2.6vw, 28px);
  border-radius: var(--radius);
}

.page-about .partner-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .partner-list li {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.page-about .partner-list__num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .partner-list__title {
  margin: 0 0 4px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .partner-list__text {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--grey);
}

.page-about .partner-band__lead {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--ink);
}

.page-about .partner-band__side p {
  margin: 0 0 12px;
  color: var(--grey);
  line-height: 1.8;
}

/* ---------- 年度数据 ---------- */
.page-about .about-section--data {
  border-top-color: transparent;
  border-radius: var(--radius-lg);
  padding-inline: clamp(20px, 4vw, 48px);
  background: var(--midnight);
  color: var(--paper);
}

.page-about .about-section--data .eyebrow {
  color: var(--peach);
}

.page-about .about-section--data .about-head__title {
  color: var(--paper);
}

.page-about .about-section--data .about-head__lede {
  color: rgba(248, 245, 240, 0.66);
}

.page-about .stat-band {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border-radius: var(--radius);
  overflow: hidden;
  background: rgba(248, 245, 240, 0.14);
}

.page-about .stat-band__item {
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--midnight);
  transition: background-color 0.2s ease;
}

.page-about .stat-band__item:hover {
  background: rgba(255, 255, 255, 0.05);
}

.page-about .stat-band__num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(28px, 4.4vw, 46px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-about .stat-band__unit {
  margin-left: 0.25em;
  font-size: 0.38em;
  font-weight: 600;
  letter-spacing: 0;
  color: var(--peach);
}

.page-about .stat-band__label {
  margin: 0 0 8px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--paper);
}

.page-about .stat-band__desc {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.7;
  color: rgba(248, 245, 240, 0.6);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding-block: clamp(40px, 6vw, 88px);
}

.page-about .about-cta__panel {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  padding: clamp(24px, 4vw, 44px);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.2;
  color: var(--ink);
}

.page-about .about-cta__lede {
  margin: 0;
  color: var(--grey);
  line-height: 1.8;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .trust-list li {
    grid-template-columns: 96px minmax(0, 1fr);
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  }

  .page-about .aud {
    grid-template-columns: 46px minmax(0, 200px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .aud__index {
    padding-top: 0.4em;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }

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

  .page-about .trust-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .partner-band {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .about-cta__panel {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    align-items: center;
  }
}

@media (min-width: 1000px) {
  .page-about .about-frame {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-offset) + 24px);
    align-self: start;
  }

  .page-about .about-rail__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__list li + li {
    margin-top: 2px;
  }

  .page-about .about-rail__list a {
    padding: 8px 10px;
    border-radius: 8px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    animation: none !important;
  }
}