.page-about {
  --about-paper-ink: #12161C;
  --about-paper-soft: rgba(18, 22, 28, .76);
  --about-paper-faint: rgba(18, 22, 28, .1);
  background: var(--ink);
  color: var(--white);
  overflow-x: hidden;
}

.page-about .section {
  padding: clamp(56px, 9vw, 104px) 0;
}

/* ---------- 面包屑 ---------- */
.page-about .about-topline {
  padding: clamp(16px, 3vw, 26px) 0 clamp(6px, 2vw, 12px);
  border-bottom: 1px solid var(--line-3);
}

.page-about .about-topline .breadcrumb {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(56px, 11vw, 128px) 0 clamp(64px, 10vw, 120px);
}

.page-about .about-hero-media {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.page-about .about-hero-media img {
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  object-position: 62% 40%;
}

.page-about .about-hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 82% at 82% 8%, rgba(34, 227, 210, .18), transparent 60%),
    radial-gradient(96% 74% at 6% 92%, rgba(47, 107, 255, .2), transparent 64%),
    linear-gradient(180deg, rgba(11, 13, 16, .74) 0%, rgba(11, 13, 16, .9) 58%, var(--ink) 100%);
}

.page-about .about-hero-inner {
  position: relative;
}

.page-about .about-hero-title {
  margin: 20px 0 0;
  font-family: var(--f-head);
  font-size: clamp(38px, 9.4vw, 92px);
  line-height: .96;
  letter-spacing: -.015em;
  color: var(--white);
}

.page-about .about-hero-accent {
  color: var(--cyan);
}

.page-about .about-hero-lede {
  margin: 22px 0 0;
  max-width: 34em;
  font-size: clamp(15px, 3.5vw, 18px);
  line-height: 1.75;
  color: var(--white);
  opacity: .86;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

/* ---------- 数字速览 ---------- */
.page-about .about-figures {
  padding-bottom: clamp(48px, 8vw, 88px);
}

.page-about .about-figure-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-2);
  border-top: 1px solid var(--line-2);
  border-bottom: 1px solid var(--line-2);
}

.page-about .about-figure {
  background: var(--ink);
  padding: 18px 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-figure:last-child {
  grid-column: 1 / -1;
}

.page-about .about-figure-num {
  font-family: var(--f-mono);
  font-size: clamp(26px, 6.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--amber);
}

.page-about .about-figure-unit {
  font-size: .5em;
  margin-left: 3px;
  color: var(--amber);
}

.page-about .about-figure-label {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
}

/* ---------- 章节通用头 ---------- */
.page-about .about-sec-head {
  max-width: 46em;
  margin-bottom: clamp(28px, 5vw, 48px);
}

.page-about .about-sec-title {
  margin: 14px 0 0;
  font-family: var(--f-head);
  font-size: clamp(28px, 6.4vw, 52px);
  line-height: 1.02;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .about-sec-lede {
  margin: 18px 0 0;
  font-size: clamp(14px, 3.4vw, 16px);
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 五级校验 ---------- */
.page-about .about-verify-grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  align-items: start;
}

.page-about .about-verify-figure .figure-media {
  border: 1px solid var(--line-2);
  background: var(--ink-2);
}

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

.page-about .about-verify-figure .figure-caption {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-step {
  position: relative;
  padding: 18px 18px 14px 34px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-left: 2px solid var(--line-2);
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 26px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(34, 227, 210, .7);
}

.page-about .about-step-idx {
  display: block;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--mist);
}

.page-about .about-step-title {
  margin: 6px 0 8px;
  font-family: var(--f-head);
  font-size: clamp(20px, 4.4vw, 26px);
  line-height: 1.1;
  color: var(--white);
}

.page-about .about-step-main p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(242, 244, 247, .78);
}

.page-about .about-step-trigger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  padding: 6px 0;
  background: transparent;
  border: 0;
  border-bottom: 1px dashed rgba(34, 227, 210, .45);
  color: var(--cyan);
  font-family: var(--f-body);
  font-size: 12px;
  letter-spacing: .1em;
  cursor: pointer;
  transition: color var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease);
}

.page-about .about-step-trigger:hover,
.page-about .about-step-trigger:focus-visible {
  color: var(--white);
  border-bottom-color: var(--white);
}

.page-about .about-step-trigger:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

.page-about .about-step-trigger .expand-sign {
  font-size: 14px;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-step .expand-panel .expand-body p {
  margin: 0;
  padding-top: 12px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
  border-top: 1px solid var(--line);
  margin-top: 12px;
}

/* ---------- 银灰纸面区 ---------- */
.page-about .about-paper {
  position: relative;
  background: var(--paper);
  color: var(--about-paper-ink);
  padding: clamp(64px, 10vw, 112px) 0;
  clip-path: polygon(0 0, 100% 34px, 100% 100%, 0 calc(100% - 34px));
  background-image:
    repeating-linear-gradient(90deg, rgba(11, 13, 16, .045) 0 1px, transparent 1px 72px);
}

.page-about .about-chapter {
  display: block;
  font-family: var(--f-serif);
  font-size: clamp(52px, 15vw, 118px);
  line-height: .78;
  font-weight: 400;
  color: var(--about-paper-faint);
  margin-bottom: 10px;
  letter-spacing: -.02em;
}

.page-about .about-chapter--dark {
  color: rgba(216, 220, 226, .09);
}

.page-about .about-paper .eyebrow {
  color: #8a5a12;
}

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

.page-about .about-claim-title {
  margin: 12px 0 0;
  font-family: var(--f-head);
  font-size: clamp(30px, 7vw, 58px);
  line-height: 1;
  letter-spacing: -.015em;
  color: var(--about-paper-ink);
}

.page-about .about-claim-body .lede {
  margin: 0 0 18px;
  font-family: var(--f-serif);
  font-size: clamp(17px, 4vw, 21px);
  line-height: 1.7;
  color: #1d232c;
}

.page-about .about-claim-body p {
  margin: 0 0 16px;
  font-size: clamp(14px, 3.5vw, 16px);
  line-height: 1.85;
  color: var(--about-paper-soft);
  max-width: 36em;
}

.page-about .about-claim-points {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  border-top: 1px solid var(--about-paper-faint);
  padding-top: 18px;
}

.page-about .about-claim-points li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: #1d232c;
}

.page-about .about-claim-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 8px;
  height: 2px;
  background: var(--red);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  padding-bottom: clamp(48px, 8vw, 84px);
}

.page-about .about-rail {
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  scroll-snap-type: x mandatory;
  padding: 6px var(--gutter) 16px;
  scrollbar-width: thin;
  scrollbar-color: var(--cyan) transparent;
}

.page-about .about-rail::-webkit-scrollbar {
  height: 3px;
}

.page-about .about-rail::-webkit-scrollbar-thumb {
  background: var(--cyan);
}

.page-about .about-rail:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 4px;
}

.page-about .about-rail-list {
  position: relative;
  display: flex;
  gap: 16px;
  list-style: none;
  margin: 0;
  padding: 0;
  min-width: min-content;
}

.page-about .about-rail-list::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--line-2) 0 1px, transparent 1px 14px);
}

.page-about .about-rail-item {
  scroll-snap-align: start;
  flex: 0 0 min(78vw, 340px);
  background: var(--ink-2);
  border-top: 2px solid var(--amber);
  padding: 22px 20px 26px;
}

.page-about .about-rail-dot {
  display: block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(232, 163, 61, .14);
  margin: 4px 0 16px;
}

.page-about .about-rail-tag {
  display: inline-block;
  font-family: var(--f-mono);
  font-size: 13px;
  letter-spacing: .12em;
}

.page-about .about-rail-title {
  margin: 12px 0 10px;
  font-family: var(--f-head);
  font-size: clamp(20px, 4.6vw, 26px);
  line-height: 1.1;
  color: var(--white);
}

.page-about .about-rail-item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(242, 244, 247, .74);
}

.page-about .about-rail-hint {
  margin: 16px 0 0;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

.page-about .about-team-title {
  margin: 12px 0 18px;
  font-family: var(--f-head);
  font-size: clamp(28px, 6.6vw, 52px);
  line-height: 1.02;
  letter-spacing: -.015em;
  color: var(--about-paper-ink);
}

.page-about .about-team-text p {
  margin: 0 0 16px;
  font-size: clamp(14px, 3.5vw, 16px);
  line-height: 1.85;
  color: var(--about-paper-soft);
  max-width: 36em;
}

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

.page-about .about-team-stat {
  background: var(--paper);
  padding: 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-team-stat-num {
  font-family: var(--f-mono);
  font-size: clamp(22px, 5vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--about-paper-ink);
}

.page-about .about-team-stat-label {
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: .04em;
  color: rgba(18, 22, 28, .6);
}

.page-about .about-team-figure .figure-media {
  border: 1px solid var(--about-paper-faint);
  background: #c9ced6;
}

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

.page-about .about-team-figure .figure-caption {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(18, 22, 28, .56);
}

/* ---------- 起步导读 ---------- */
.page-about .about-start-cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-start-card {
  padding: 26px 22px 24px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-left: 3px solid var(--line-2);
  transition: transform var(--dur-2) var(--ease), border-color var(--dur-2) var(--ease);
}

.page-about .about-start-card:hover {
  transform: translateY(-4px);
}

.page-about .about-start-card--a {
  border-left-color: var(--blue);
  background: linear-gradient(158deg, rgba(47, 107, 255, .16), var(--ink-2) 64%);
}

.page-about .about-start-card--b {
  border-left-color: var(--cyan);
  background: linear-gradient(158deg, rgba(34, 227, 210, .13), var(--ink-2) 64%);
}

.page-about .about-start-card--c {
  border-left-color: var(--amber);
  background: linear-gradient(158deg, rgba(232, 163, 61, .14), var(--ink-2) 64%);
}

.page-about .about-start-kicker {
  display: block;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--mist);
}

.page-about .about-start-card-title {
  margin: 10px 0 10px;
  font-family: var(--f-head);
  font-size: clamp(22px, 5vw, 28px);
  line-height: 1.1;
  color: var(--white);
}

.page-about .about-start-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(242, 244, 247, .76);
}

.page-about .about-start-link {
  display: inline-block;
  margin-top: 18px;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 227, 210, .5);
  padding-bottom: 2px;
  transition: color var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease);
}

.page-about .about-start-link:hover,
.page-about .about-start-link:focus-visible {
  color: var(--white);
  border-bottom-color: var(--white);
}

.page-about .about-start-link:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

/* ---------- 服务范围 ---------- */
.page-about .about-scope {
  padding-bottom: clamp(64px, 10vw, 116px);
}

.page-about .about-scope-grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
}

.page-about .about-scope-title {
  margin: 14px 0 18px;
  font-family: var(--f-head);
  font-size: clamp(28px, 6.4vw, 50px);
  line-height: 1.02;
  letter-spacing: -.012em;
  color: var(--white);
}

.page-about .about-scope-text p {
  margin: 0 0 22px;
  font-size: clamp(14px, 3.5vw, 16px);
  line-height: 1.85;
  color: var(--mist);
  max-width: 32em;
}

.page-about .about-scope-list {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-scope-row {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 14px;
  background: var(--ink);
  padding: 14px 16px;
}

.page-about .about-scope-row dt {
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--mist);
  align-self: center;
}

.page-about .about-scope-row dd {
  margin: 0;
  font-family: var(--f-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--white);
  word-break: break-word;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-figure-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-figure:last-child {
    grid-column: auto;
  }

  .page-about .about-verify-grid {
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  }

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

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

@media (min-width: 1024px) {
  .page-about .about-figure-list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-claim-grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    gap: clamp(40px, 7vw, 104px);
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: clamp(40px, 6vw, 80px);
  }

  .page-about .about-scope-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .92fr);
    gap: clamp(40px, 6vw, 88px);
  }

  .page-about .about-rail-item {
    flex-basis: 372px;
  }

  .page-about .about-hero-media img {
    object-position: 68% 42%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-start-card,
  .page-about .about-start-link,
  .page-about .about-step-trigger {
    transition: none;
  }

  .page-about .about-start-card:hover {
    transform: none;
  }
}
<<<END>>>