.page-about {
  --about-rail: 214px;
  --about-rail-gap: 60px;
  background: var(--paper);
  color: var(--ink);
}

/* ---------- 首屏封面 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 62px) 0 66px;
  color: var(--white);
  background:
    radial-gradient(125% 95% at 88% 4%, rgba(31, 78, 140, 0.58) 0%, rgba(14, 27, 51, 0) 62%),
    linear-gradient(158deg, var(--ink) 0%, var(--deep) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0) 84%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0) 84%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -140px;
  bottom: -180px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  border: 1px solid rgba(200, 149, 47, 0.34);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 30px;
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.6);
}

.page-about .about-hero__crumb a {
  color: var(--gold-tint);
  text-decoration: none;
  transition: color 0.25s var(--ease);
}

.page-about .about-hero__crumb a:hover,
.page-about .about-hero__crumb a:focus-visible {
  color: var(--gold);
}

.page-about .about-hero__sep {
  opacity: 0.45;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-hero__title {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 9vw, 5.25rem);
  font-weight: 800;
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-hero__title-sub {
  display: block;
  margin-top: 16px;
  font-size: clamp(0.9375rem, 3.2vw, 1.25rem);
  font-weight: 500;
  line-height: 1.6;
  letter-spacing: 0.01em;
  color: var(--gold-tint);
}

.page-about .about-hero__lead {
  max-width: 62ch;
  margin: 0;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.82);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 22px;
  margin: 38px 0 0;
  padding-top: 28px;
  border-top: 1px solid rgba(200, 149, 47, 0.36);
}

.page-about .about-stat__label {
  margin: 0 0 6px;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.58);
}

.page-about .about-stat__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 5vw, 1.75rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--gold);
}

/* ---------- 主布局 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding-top: 40px;
  padding-bottom: 88px;
}

/* ---------- 左侧索引 ---------- */
.page-about .about-rail__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-about .about-rail__nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 10px;
  scrollbar-width: none;
}

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

.page-about .about-rail__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 14px;
  border: 1px solid var(--mist);
  border-radius: var(--r-pill);
  background: var(--white);
  color: var(--ink);
  font-size: 0.8125rem;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--gold);
  color: var(--brand);
}

.page-about .about-rail__no {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--gold);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding: 40px 0 46px;
  border-top: 1px solid rgba(200, 149, 47, 0.32);
}

.page-about .about-sections > .about-sec:first-child {
  border-top: 0;
  padding-top: 4px;
}

.page-about .about-sec__no {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-sec__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: clamp(1.4375rem, 4.8vw, 2.25rem);
  font-weight: 800;
  line-height: 1.26;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.page-about .about-sec__lead {
  max-width: 66ch;
  margin: 0 0 26px;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--slate);
}

.page-about .about-note {
  margin: 24px 0 0;
  padding: 18px 20px;
  border-left: 3px solid var(--gold);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: var(--white);
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .about-note a {
  color: var(--brand);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-note a:hover,
.page-about .about-note a:focus-visible {
  color: var(--gold);
}

/* ---------- 图片位 ---------- */
.page-about .about-figure {
  margin: 0 0 30px;
}

.page-about .about-figure__box {
  overflow: hidden;
  border-radius: var(--r-md);
  background: var(--deep);
}

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

.page-about .about-figure__caption {
  margin-top: 12px;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 8px 0 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--brand) 100%);
  opacity: 0.6;
}

.page-about .about-node {
  position: relative;
  padding: 0 0 34px;
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--gold);
}

.page-about .about-node__year {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--brand);
}

.page-about .about-node__title {
  margin: 0 0 8px;
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .about-node__text {
  max-width: 60ch;
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--slate);
}

/* ---------- 业务三条线 ---------- */
.page-about .about-lines {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--mist);
  border-radius: var(--r-lg);
  background: var(--mist);
}

.page-about .about-line {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 26px 24px 26px 28px;
  background: var(--white);
  transition: background 0.3s var(--ease);
}

.page-about .about-line::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--line-accent, var(--brand));
}

.page-about .about-line--a { --line-accent: var(--brand); }
.page-about .about-line--b { --line-accent: var(--gold); }
.page-about .about-line--c { --line-accent: var(--celadon); }

.page-about .about-line:hover {
  background: #FCFBF8;
}

.page-about .about-line__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--line-accent, var(--brand));
}

.page-about .about-line__title {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .about-line__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .about-line__owner {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--slate);
}

.page-about .about-line__link {
  margin-top: auto;
  padding-top: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--brand);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  align-self: flex-start;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-line__link:hover,
.page-about .about-line__link:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

/* ---------- 团队构成 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-team__card {
  position: relative;
  padding: 22px 20px 24px;
  border: 1px solid var(--mist);
  border-radius: var(--r-md);
  background: var(--white);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .about-team__card::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 0;
  width: 34px;
  height: 3px;
  border-radius: 0 0 3px 3px;
  background: var(--card-accent, var(--brand));
}

.page-about .about-team__card:hover {
  transform: translateY(-2px);
  border-color: var(--gold);
  box-shadow: var(--shadow-card);
}

.page-about .about-team__card--ops { --card-accent: var(--brand); }
.page-about .about-team__card--cat { --card-accent: var(--gold); }
.page-about .about-team__card--data { --card-accent: var(--celadon); }
.page-about .about-team__card--cs { --card-accent: var(--slate); }

.page-about .about-team__title {
  margin: 12px 0 8px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-team__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 数据与版本 ---------- */
.page-about .about-data {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-bottom: 30px;
}

.page-about .about-data__item {
  padding: 24px 22px 26px;
  border-radius: var(--r-md);
  background: linear-gradient(150deg, var(--ink) 0%, var(--deep) 100%);
  color: var(--white);
}

.page-about .about-data__label {
  margin: 0 0 10px;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: rgba(255, 255, 255, 0.62);
}

.page-about .about-data__value {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: clamp(1.625rem, 6vw, 2.125rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--gold);
}

.page-about .about-data__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.78);
}

/* ---------- 伙伴生态 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-partner {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  padding: 22px;
  border: 1px solid var(--mist);
  border-radius: var(--r-md);
  background: var(--white);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .about-partner:hover {
  transform: translateY(-2px);
  border-color: var(--gold);
}

.page-about .about-partner__badge {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 16px;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--white);
  background: var(--brand);
}

.page-about .about-partner__badge--region {
  background: var(--celadon);
}

.page-about .about-partner__badge--cate {
  background: var(--brick);
}

.page-about .about-partner__title {
  margin: 0 0 8px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-partner__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 资质与备案 ---------- */
.page-about .about-cred {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--mist);
  border-radius: var(--r-md);
  background: var(--mist);
}

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

.page-about .about-cred__label {
  margin: 0 0 6px;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--slate);
}

.page-about .about-cred__value {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--ink);
  word-break: break-word;
}

.page-about .about-cred__value--mono {
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: 0.01em;
}

/* ---------- 结尾引导 ---------- */
.page-about .about-cta {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 30px;
  padding: 26px 24px;
  border-radius: var(--r-lg);
  background: var(--gold-tint);
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 1rem;
  line-height: 1.7;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-cta__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  align-self: flex-start;
  padding: 12px 26px;
  border-radius: var(--r-pill);
  background: var(--brand);
  color: var(--white);
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-cta__btn:hover,
.page-about .about-cta__btn:focus-visible {
  background: var(--ink);
  transform: translateY(-2px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-cred__item--wide {
    grid-column: 1 / -1;
  }

  .page-about .about-cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 28px 32px;
  }

  .page-about .about-cta__btn {
    align-self: auto;
    flex: 0 0 auto;
  }
}

@media (min-width: 760px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px 28px;
  }

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

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

  .page-about .about-figure--narrow .about-figure__box {
    max-width: 620px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 88px) 0 86px;
  }

  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 0 var(--about-rail-gap);
    padding-top: 62px;
    padding-bottom: 108px;
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: calc(var(--header-h) + 30px);
  }

  .page-about .about-rail__nav {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    width: 100%;
    padding: 10px 14px;
    border: 0;
    border-left: 2px solid var(--mist);
    border-radius: 0;
    background: transparent;
    font-size: 0.875rem;
    transition: border-color 0.25s var(--ease), color 0.25s var(--ease), background 0.25s var(--ease);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-left-color: var(--gold);
    background: rgba(240, 223, 184, 0.34);
    color: var(--brand);
  }

  .page-about .about-sec {
    padding: 52px 0 58px;
  }

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

  .page-about .about-figure--wide .about-figure__box {
    border-radius: var(--r-lg);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-line,
  .page-about .about-team__card,
  .page-about .about-partner,
  .page-about .about-cta__btn,
  .page-about .about-rail__link {
    transition: none;
  }

  .page-about .about-team__card:hover,
  .page-about .about-partner:hover,
  .page-about .about-cta__btn:hover,
  .page-about .about-cta__btn:focus-visible {
    transform: none;
  }
}