.page-about {
  --arc-col: 168px;
  --about-line: rgba(198, 205, 211, 0.22);
  --about-line-strong: rgba(198, 205, 211, 0.45);
  --about-text: rgba(242, 246, 243, 0.78);
  --about-text-strong: rgba(242, 246, 243, 0.92);
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding-top: 28px;
}
.page-about .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}
.page-about .crumbs li + li::before {
  content: "/";
  margin-right: 10px;
  color: rgba(198, 205, 211, 0.45);
}
.page-about .crumbs a {
  color: var(--mist);
  text-decoration: none;
}
.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--lime);
}

/* ---------- 通用文字 ---------- */
.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--silver);
}
.page-about .about-link {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 255, 61, 0.45);
}
.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  border-bottom-color: var(--lime);
}

/* ---------- 首屏 ---------- */
.about-hero {
  padding: 28px 0 0;
}
.about-hero__grid {
  display: grid;
  gap: 34px;
}
.about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.1rem, 8vw, 4.1rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  max-width: 22ch;
}
.about-hero__title em {
  font-style: normal;
  color: var(--lime);
}
.about-hero__lead {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--about-text-strong);
}
.about-hero__meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 28px 0 0;
  padding: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}
.about-meta__item {
  background: var(--ink);
  padding: 13px 15px;
}
.about-meta__k {
  margin: 0;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--mist);
}
.about-meta__v {
  margin: 6px 0 0;
  font-family: var(--font-data);
  font-size: 19px;
  font-weight: 500;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.about-hero__side {
  border-top: 1px solid var(--about-line-strong);
  padding-top: 14px;
}
.about-index__cap {
  margin: 0 0 4px;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--mist);
}
.about-index {
  list-style: none;
  margin: 0;
  padding: 0;
}
.about-index a {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px solid var(--about-line);
  color: var(--white);
  text-decoration: none;
  font-size: 15px;
}
.about-index__n {
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--silver);
}
.about-index__t {
  transition: color 0.18s ease;
}
.about-index a:hover .about-index__t,
.about-index a:focus-visible .about-index__t {
  color: var(--lime);
}
.about-index a:focus-visible {
  outline: 1px solid var(--lime);
  outline-offset: 2px;
}

/* ---------- 章节骨架 ---------- */
.arc {
  padding: 52px 0;
  border-top: 1px solid var(--about-line);
}
.arc--end {
  padding-bottom: 72px;
}
.arc__grid {
  display: grid;
  gap: 26px;
}
.arc__aside {
  border-left: 1px solid var(--about-line-strong);
  padding-left: 14px;
}
.arc__num {
  margin: 0;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--lime);
}
.arc__label {
  margin: 6px 0 0;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--mist);
}
.arc__body h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 5.4vw, 2.55rem);
  line-height: 1.08;
  letter-spacing: -0.015em;
  max-width: 24ch;
}
.lede {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--about-text-strong);
}
.about-prose p {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-text);
}

/* ---------- 图文分栏 ---------- */
.arc__split {
  display: grid;
  gap: 26px;
  margin-top: 26px;
}
.page-about .media {
  margin: 0;
  border: 1px solid var(--about-line);
  background: var(--ink-2);
}
.page-about .media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .media--wide img {
  aspect-ratio: 3 / 2;
}
.page-about .about-figure img {
  aspect-ratio: 3 / 2;
}
.page-about .about-figure--tall img {
  aspect-ratio: 2 / 3;
}
.page-about .media__caption {
  margin: 0;
  padding: 11px 14px;
  border-top: 1px solid var(--about-line);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 四步流程 ---------- */
.flow__steps {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}
.flow__step {
  position: relative;
  border: 1px solid var(--about-line);
  background: var(--ink-2);
  padding: 15px 16px 17px;
}
.flow__step + .flow__step::before {
  content: "";
  position: absolute;
  left: 22px;
  top: -18px;
  width: 1px;
  height: 18px;
  background: var(--about-line-strong);
}
.flow__step + .flow__step::after {
  content: "";
  position: absolute;
  left: 18px;
  top: -10px;
  width: 9px;
  height: 9px;
  background: var(--lime);
  transform: rotate(45deg);
}
.flow__step-n {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--lime);
}
.flow__step-t {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.02em;
  color: var(--white);
}
.flow__step-d {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--about-text);
}
.flow__cap {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
  border-left: 2px solid var(--orange);
  padding-left: 12px;
}

/* ---------- 时间线 ---------- */
.timeline {
  list-style: none;
  margin: 28px 0 0;
  padding: 0 0 0 26px;
  position: relative;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--lime) 0%, rgba(198, 205, 211, 0.35) 100%);
}
.tl-item {
  position: relative;
  border-bottom: 1px solid var(--about-line);
}
.tl-item:first-child {
  border-top: 1px solid var(--about-line);
}
.tl-item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 24px;
  width: 9px;
  height: 9px;
  background: var(--lime);
  transform: rotate(45deg);
}
.tl-item--milestone::before {
  background: var(--orange);
}
.tl-node summary {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 16px;
  padding: 17px 30px 17px 0;
  cursor: pointer;
  list-style: none;
}
.tl-node summary::-webkit-details-marker {
  display: none;
}
.tl-node summary::after {
  content: "+";
  position: absolute;
  right: 2px;
  top: 14px;
  font-family: var(--font-data);
  font-size: 18px;
  color: var(--lime);
}
.tl-node[open] summary::after {
  content: "\2013";
}
.tl-node summary:focus-visible {
  outline: 1px solid var(--lime);
  outline-offset: 2px;
}
.tl-year {
  font-family: var(--font-data);
  font-size: 15px;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}
.tl-title {
  font-size: 16px;
  color: var(--white);
}
.tl-panel {
  padding: 0 0 18px;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-text);
}

/* ---------- 租借字段 ---------- */
.loan-track {
  display: flex;
  gap: 14px;
  margin-top: 26px;
  padding: 2px 2px 14px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}
.loan-track:focus-visible {
  outline: 1px solid var(--lime);
  outline-offset: 3px;
}
.loan-card {
  flex: 0 0 250px;
  scroll-snap-align: start;
  border: 1px solid var(--about-line);
  border-top: 2px solid var(--lime);
  background: var(--ink-2);
  padding: 16px 16px 18px;
}
.loan-card__k {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--white);
}
.loan-card__d {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-text);
}

/* ---------- 角色分工 ---------- */
.role-list {
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}
.role {
  background: var(--ink);
  padding: 16px 16px 18px;
}
.role__k {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--lime);
}
.role__d {
  margin: 9px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-text);
}

/* ---------- 服务对象 ---------- */
.audience {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}
.audience__item {
  background: var(--ink);
  padding: 18px 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.audience__role {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  color: var(--white);
}
.audience__d {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-text);
}
.audience__item .tag {
  align-self: flex-start;
}
.audience__note {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 里程碑 ---------- */
.milestones {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}
.ms-item {
  border-left: 2px solid var(--lime);
  padding: 6px 0 8px 16px;
  transition: border-color 0.2s ease;
}
.ms-item--alt {
  border-left-color: var(--silver);
}
.ms-item:hover,
.ms-item:focus-within {
  border-left-color: var(--orange);
}
.ms-year {
  margin: 0;
  font-family: var(--font-data);
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}
.ms-item--alt .ms-year {
  color: var(--silver);
}
.ms-title {
  margin: 8px 0 0;
  font-size: 16.5px;
  font-weight: 600;
  color: var(--white);
}
.ms-d {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-text);
}
.ms-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 0;
}

/* ---------- 结尾联系 ---------- */
.about-contact {
  margin-top: 24px;
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--lime);
  background: var(--ink-2);
  padding: 20px 18px 22px;
}
.about-contact__lead {
  margin: 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--about-text-strong);
}
.about-contact .mono {
  font-family: var(--font-data);
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}
.about-contact__addr {
  margin: 12px 0 0;
  font-size: 13.5px;
  letter-spacing: 0.04em;
  color: var(--mist);
}
.about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

/* ---------- 中等屏 ---------- */
@media (min-width: 640px) {
  .about-hero__meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .flow__steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .audience {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about {
    --arc-col: 208px;
  }
  .about-hero {
    padding: 44px 0 0;
  }
  .about-hero__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: 56px;
    align-items: end;
  }
  .about-hero__side {
    padding-top: 16px;
  }
  .arc {
    padding: 72px 0;
  }
  .arc__grid {
    grid-template-columns: var(--arc-col) minmax(0, 1fr);
    gap: 48px;
  }
  .arc__aside {
    position: sticky;
    top: 28px;
    align-self: start;
    padding-left: 16px;
  }
  .arc__split {
    gap: 40px;
    align-items: start;
  }
  .arc__split > * {
    min-width: 0;
  }
  .about-split--flow {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  }
  .about-split--timeline {
    grid-template-columns: minmax(0, 1fr) minmax(0, 260px);
    gap: 36px;
  }
  .page-about .about-figure--tight img {
    aspect-ratio: 4 / 3;
  }
  .flow__steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }
  .flow__step {
    padding: 17px 14px 19px;
  }
  .flow__step + .flow__step::before {
    left: -14px;
    top: 38px;
    width: 14px;
    height: 1px;
  }
  .flow__step + .flow__step::after {
    left: -10px;
    top: 34px;
  }
  .arc__split--rev > *:first-child {
    order: 2;
  }
  .role-list {
    border: 1px solid var(--about-line);
  }
  .milestones {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 44px;
    padding-bottom: 46px;
  }
  .ms-item:nth-child(even) {
    transform: translateY(46px);
  }
  .about-contact {
    padding: 24px 24px 26px;
  }
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__t,
  .page-about .ms-item {
    transition: none;
  }
}
<<<END>>>