.page-about {
  background: var(--white);
  color: var(--ink);
  overflow-x: hidden;
}

.page-about .eyebrow {
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  padding-top: 18px;
  padding-bottom: 2px;
  font-size: 13px;
  color: var(--slate);
}
.page-about .breadcrumb__item {
  color: var(--navy-500);
  text-decoration: none;
}
.page-about .breadcrumb__item[aria-current] {
  color: var(--slate);
}
.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin: 0 8px;
  color: var(--line);
}

/* ---------- 通用标题 ---------- */
.page-about .section {
  padding: 52px 0;
}
.page-about h2 {
  font-family: var(--font-narrow);
  font-size: clamp(21px, 4.4vw, 32px);
  line-height: 1.26;
  letter-spacing: -0.018em;
  color: var(--navy-900);
  margin: 10px 0 0;
  max-width: 26em;
}
.page-about .about-head {
  max-width: 780px;
}
.page-about .about-head__sub {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate);
  max-width: 62ch;
}

/* ---------- 首屏：单栏叙事，大留白 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 38px 0 46px;
  background: var(--gray);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(31, 96, 145, 0.12) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(31, 96, 145, 0.12) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(180deg, #000 6%, transparent 86%);
  mask-image: linear-gradient(180deg, #000 6%, transparent 86%);
  pointer-events: none;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  top: -34%;
  width: 52%;
  height: 168%;
  transform: rotate(10deg);
  background: linear-gradient(158deg, rgba(23, 195, 201, 0.18), rgba(31, 96, 145, 0.04) 58%, transparent 78%);
  pointer-events: none;
}
.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}
.page-about .about-hero__title {
  font-family: var(--font-narrow);
  font-size: clamp(26px, 6.4vw, 52px);
  line-height: 1.14;
  letter-spacing: -0.022em;
  color: var(--navy-900);
  margin: 14px 0 0;
  max-width: 20em;
}
.page-about .about-hero__lede {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 62ch;
}
.page-about .about-hero__note {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate);
  max-width: 62ch;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.page-about .about-stat {
  background: var(--white);
  padding: 16px 16px 18px;
}
.page-about .about-stat .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--navy-900);
}
.page-about .about-stat .stat__label {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--slate);
}

/* ---------- 三件事 ---------- */
.page-about .about-three {
  background: var(--white);
}
.page-about .about-three__grid {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}
.page-about .about-pillar {
  position: relative;
  padding: 22px 20px 24px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--navy-500);
  border-radius: var(--radius);
  background: var(--white);
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease);
}
.page-about .about-pillar:hover {
  transform: translateY(-4px);
  border-color: var(--navy-700);
}
.page-about .about-pillar--speed { border-top-color: var(--cyan); }
.page-about .about-pillar--accurate { border-top-color: var(--navy-500); }
.page-about .about-pillar--client { border-top-color: var(--orange); }

.page-about .about-pillar__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--slate);
}
.page-about .about-pillar__title {
  margin: 8px 0 0;
  font-family: var(--font-narrow);
  font-size: 22px;
  letter-spacing: -0.012em;
  color: var(--navy-900);
}
.page-about .about-pillar__lead {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink);
}
.page-about .about-pillar__body {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate);
}
.page-about .about-three__more {
  margin: 28px 0 0;
}

/* ---------- 三级栏目 ---------- */
.page-about .about-levels {
  background: var(--paper);
}
.page-about .about-tree {
  display: grid;
  gap: 12px;
  margin-top: 30px;
}
.page-about .about-tree__node {
  border: 1px solid var(--line);
  border-left: 3px solid var(--navy-500);
  border-radius: var(--radius-sm);
  background: var(--white);
  overflow: hidden;
}
.page-about .about-tree__node--l2 { border-left-color: var(--cyan); }
.page-about .about-tree__node--l3 { border-left-color: var(--orange); }

.page-about .about-tree__summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px 12px;
  padding: 18px 18px 16px;
  cursor: pointer;
  list-style: none;
}
.page-about .about-tree__summary::-webkit-details-marker { display: none; }
.page-about .about-tree__lv {
  grid-column: 1;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate);
}
.page-about .about-tree__count {
  grid-column: 2;
  grid-row: 1 / span 2;
  align-self: center;
  font-family: var(--font-mono);
  font-size: 32px;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--navy-900);
}
.page-about .about-tree__desc {
  grid-column: 1;
  font-size: 15px;
  line-height: 1.5;
  color: var(--ink);
}
.page-about .about-tree__body {
  margin: 0;
  padding: 0 18px 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .about-dots {
  position: relative;
  height: 106px;
  margin-top: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background-color: var(--white);
  background-image: radial-gradient(circle, rgba(31, 96, 145, 0.55) 1.5px, transparent 1.6px);
  background-size: 14px 14px;
  background-position: 7px 7px;
  overflow: hidden;
}
.page-about .about-dots::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent 58%, rgba(255, 122, 47, 0.14));
  pointer-events: none;
}
.page-about .about-tree__caption {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate);
}
.page-about .about-tree__why {
  margin: 22px 0 0;
  padding-left: 16px;
  border-left: 3px solid var(--navy-500);
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 66ch;
}

/* ---------- 会员中心 ---------- */
.page-about .about-member {
  background: var(--white);
}
.page-about .about-member__grid {
  gap: 26px;
}
.page-about .about-member__intro {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 60ch;
}
.page-about .about-member__list {
  display: grid;
  gap: 16px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-member__list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate);
}
.page-about .about-member__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--cyan);
}
.page-about .about-member__list strong {
  color: var(--navy-900);
  font-weight: 600;
}

.page-about .about-member__aside {
  padding: 22px 20px;
  border-radius: var(--radius);
  background: var(--navy-900);
  border-left: 3px solid var(--cyan);
}
.page-about .about-member__aside-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}
.page-about .about-member__aside-text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.84);
}

/* ---------- 版本节奏 ---------- */
.page-about .about-versions {
  position: relative;
  overflow: hidden;
  padding: 56px 0 60px;
  background: var(--navy-900);
  color: var(--white);
}
.page-about .about-versions::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.06) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(120% 90% at 18% 0%, #000, transparent 72%);
  mask-image: radial-gradient(120% 90% at 18% 0%, #000, transparent 72%);
  pointer-events: none;
}
.page-about .about-versions .container,
.page-about .about-rail {
  position: relative;
  z-index: 1;
}
.page-about .about-versions h2 { color: var(--white); }
.page-about .about-versions .eyebrow { color: var(--cyan); }
.page-about .about-versions .about-head__sub { color: rgba(255, 255, 255, 0.7); }

.page-about .about-versions__figure {
  margin: 32px 0 0;
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.14);
  overflow: hidden;
}
.page-about .about-versions__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-rail {
  margin-top: 34px;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 18px;
  scrollbar-color: rgba(255, 255, 255, 0.3) transparent;
}
.page-about .about-rail__track {
  position: relative;
  display: flex;
  gap: 16px;
  width: max-content;
  min-width: 100%;
  margin: 0;
  padding: 0 20px 6px;
  list-style: none;
}
.page-about .about-rail__track::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 19px;
  height: 2px;
  background: var(--navy-500);
  z-index: 0;
}
.page-about .about-rail__stage {
  position: relative;
  z-index: 1;
  flex: 0 0 auto;
  width: min(82vw, 322px);
  scroll-snap-align: start;
  padding: 48px 20px 22px;
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.05);
}
.page-about .about-rail__stage::before {
  content: "";
  position: absolute;
  top: 14px;
  left: 20px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(23, 195, 201, 0.16);
}
.page-about .about-rail__stage:last-child::before {
  background: var(--orange);
  box-shadow: 0 0 0 5px rgba(255, 122, 47, 0.18);
}
.page-about .about-rail__ver {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}
.page-about .about-rail__title {
  margin: 8px 0 0;
  font-family: var(--font-narrow);
  font-size: 20px;
  letter-spacing: -0.012em;
  color: var(--white);
}
.page-about .about-rail__body {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.78);
}
.page-about .about-rail__solve {
  margin: 16px 0 0;
  padding-top: 13px;
  border-top: 1px dashed rgba(255, 255, 255, 0.18);
  font-size: 13px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.7);
}
.page-about .about-rail__solve span {
  display: inline-block;
  margin-right: 6px;
  padding: 1px 8px;
  border-radius: 999px;
  background: rgba(23, 195, 201, 0.16);
  color: var(--cyan);
  font-size: 12px;
}
.page-about .about-versions__more {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.66);
}
.page-about .about-versions__more a {
  color: var(--cyan);
}

/* ---------- 团队与分工 ---------- */
.page-about .about-team {
  background: var(--gray);
}
.page-about .about-team__grid {
  display: grid;
  gap: 26px;
  margin-top: 28px;
}
.page-about .about-team__intro {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 60ch;
}
.page-about .about-bars {
  display: grid;
  gap: 16px;
  margin-top: 26px;
}
.page-about .about-bars__row {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr) 44px;
  align-items: center;
  gap: 12px;
}
.page-about .about-bars__label {
  font-size: 13px;
  color: var(--ink);
}
.page-about .about-bars__track {
  display: block;
  height: 10px;
  border-radius: 999px;
  background: rgba(31, 96, 145, 0.14);
  overflow: hidden;
  transition: box-shadow 0.24s var(--ease);
}
.page-about .about-bars__row:hover .about-bars__track {
  box-shadow: 0 0 0 2px rgba(23, 195, 201, 0.32);
}
.page-about .about-bars__fill {
  display: block;
  height: 100%;
  border-radius: 999px;
}
.page-about .about-bars__fill--tech {
  width: 58.3%;
  background: var(--navy-700);
}
.page-about .about-bars__fill--ops {
  width: 41.7%;
  background: var(--cyan);
}
.page-about .about-bars__num {
  font-family: var(--font-mono);
  font-size: 15px;
  text-align: right;
  color: var(--navy-900);
}

.page-about .about-team__duties {
  display: grid;
  gap: 14px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-team__duties li {
  font-size: 14px;
  line-height: 1.82;
  color: var(--slate);
}
.page-about .about-team__duties span {
  display: inline-block;
  min-width: 68px;
  margin-right: 8px;
  padding: 2px 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--white);
  color: var(--navy-700);
  font-size: 12px;
  text-align: center;
}

.page-about .about-team__figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-partners {
  margin-top: 40px;
  padding: 26px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}
.page-about .about-partners__title {
  margin: 0;
  font-family: var(--font-narrow);
  font-size: 20px;
  letter-spacing: -0.012em;
  color: var(--navy-900);
}
.page-about .about-partners__text {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 68ch;
}
.page-about .about-partners__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-partners__note {
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--slate);
  max-width: 68ch;
}

/* ---------- 运营与合规 ---------- */
.page-about .about-compliance {
  background: var(--white);
}
.page-about .about-compliance__card {
  padding: 28px 22px;
  border: 1px solid rgba(11, 34, 57, 0.08);
  border-radius: var(--radius);
  background: var(--paper);
}
.page-about .about-compliance__grid {
  display: grid;
  gap: 26px;
}
.page-about .about-compliance__list {
  display: grid;
  gap: 14px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-compliance__list li {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
}
.page-about .about-compliance__label {
  display: inline-block;
  min-width: 44px;
  margin-right: 8px;
  padding: 1px 8px;
  border-radius: 999px;
  background: var(--navy-900);
  color: var(--white);
  font-size: 12px;
  text-align: center;
}
.page-about .about-compliance__links {
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--slate);
}
.page-about .about-compliance__links a {
  color: var(--navy-500);
}
.page-about .about-compliance__figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--white);
}
.page-about .about-compliance__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-hero {
    padding: 56px 0 64px;
  }
  .page-about .section {
    padding: 74px 0;
  }
  .page-about .about-partners {
    padding: 32px 34px;
  }
  .page-about .about-compliance__card {
    padding: 36px 38px;
  }
}

@media (min-width: 820px) {
  .page-about .about-three__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
  .page-about .about-tree {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    align-items: start;
  }
  .page-about .about-rail__track {
    padding: 0 32px 8px;
  }
}

@media (min-width: 900px) {
  .page-about .section {
    padding: 88px 0;
  }
  .page-about .about-member__grid {
    gap: 48px;
    align-items: start;
  }
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 40px;
    align-items: start;
  }
  .page-about .about-partners {
    margin-top: 52px;
  }
  .page-about .about-compliance__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 44px;
    align-items: center;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero {
    padding: 72px 0 80px;
  }
  .page-about .about-hero__title {
    font-size: 56px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}
<<<END>>>