.page-about {
  --about-rail-w: 212px;
  --about-gap: clamp(20px, 3.4vw, 40px);
  --about-shift: 40px;
  display: block;
  padding: clamp(14px, 2.6vw, 32px) var(--pad) clamp(44px, 6vw, 88px);
}

.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  max-width: 1420px;
  margin: 0 auto;
}

/* ---------- 左侧刻度索引 ---------- */
.page-about .about-rail {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(22, 38, 31, 0.92), rgba(14, 27, 22, 0.92));
  padding: 12px 12px 14px;
}

.page-about .about-rail__title {
  margin: 0 0 10px;
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--line-2);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  color: var(--muted);
  text-decoration: none;
  font-size: 13px;
  line-height: 1.2;
  white-space: nowrap;
  border: 1px solid transparent;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-rail__num {
  font-size: 11px;
  color: var(--acid);
  letter-spacing: 0.06em;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--paper);
  background: var(--ink-700);
  border-color: var(--line-2);
}

.page-about .about-rail__link:focus-visible {
  outline: 2px solid var(--acid);
  outline-offset: 2px;
}

.page-about .about-rail__foot {
  display: none;
  margin: 14px 0 0;
  font-size: 10px;
  letter-spacing: 0.14em;
  color: rgba(157, 176, 166, 0.6);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-2);
  border-radius: var(--radius-lg);
  background: var(--ink-800);
  min-height: clamp(400px, 62vh, 620px);
  display: flex;
  align-items: flex-end;
  margin-bottom: clamp(30px, 5vw, 60px);
  box-shadow: var(--shadow-1);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
}

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
  opacity: 0.42;
  filter: saturate(0.55) contrast(1.06);
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(7, 17, 13, 0.42) 0%, rgba(7, 17, 13, 0.72) 46%, rgba(7, 17, 13, 0.96) 100%),
    repeating-linear-gradient(90deg, var(--grid) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(0deg, var(--grid) 0 1px, transparent 1px 64px);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  width: 100%;
  padding: clamp(20px, 3.6vw, 52px);
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: 18px;
}

.page-about .about-hero .eyebrow {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 12px;
}

.page-about .about-hero h1 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 5.4vw, 62px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 18em;
}

.page-about .about-hero__lead {
  margin: 0 0 24px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(232, 240, 235, 0.82);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 24px;
}

.page-about .about-stat {
  background: rgba(14, 27, 22, 0.9);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-stat__value {
  font-size: clamp(26px, 3vw, 36px);
  font-weight: 700;
  color: var(--acid);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__value em {
  font-style: normal;
  font-size: 0.5em;
  margin-left: 2px;
  color: var(--paper);
}

.page-about .about-stat__label {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-hero__cta .btn {
  flex: 0 0 auto;
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  position: relative;
  padding: clamp(8px, 1.6vw, 18px) 0 clamp(30px, 4.4vw, 56px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-sec:first-of-type {
  border-top: 0;
}

.page-about .about-sec__head {
  margin-bottom: clamp(20px, 3vw, 36px);
  max-width: 78ch;
}

.page-about .about-sec__num {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--acid);
  padding: 3px 8px;
  border: 1px solid rgba(182, 255, 59, 0.35);
  border-radius: 4px;
  margin-bottom: 14px;
}

.page-about .about-sec h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 3.4vw, 42px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-sec__intro {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(232, 240, 235, 0.74);
}

/* ---------- 业务线 ---------- */
.page-about .about-lines {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-line {
  position: relative;
  padding: 22px 20px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, var(--ink-700), var(--ink-800) 68%);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-line::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  bottom: 20px;
  width: 3px;
  border-radius: 3px;
}

.page-about .about-line--cyan::before { background: var(--cyan); }
.page-about .about-line--acid::before { background: var(--acid); }
.page-about .about-line--violet::before { background: var(--violet); }

.page-about .about-line:hover,
.page-about .about-line:focus-within {
  border-color: var(--line-2);
  transform: translateY(-2px);
}

.page-about .about-line__meta {
  margin: 0 0 10px;
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .about-line h3 {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-line p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(232, 240, 235, 0.72);
}

.page-about .about-line__link {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--acid);
  text-decoration: none;
  border-bottom: 1px solid rgba(182, 255, 59, 0.4);
  padding-bottom: 2px;
}

.page-about .about-line__link:hover,
.page-about .about-line__link:focus-visible {
  color: #d5ff8a;
  border-bottom-color: #d5ff8a;
}

.page-about .about-line__link:focus-visible {
  outline: 2px solid var(--acid);
  outline-offset: 3px;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
  position: relative;
  display: grid;
  gap: 14px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--acid) 0%, var(--cyan) 42%, rgba(232, 240, 235, 0.12) 100%);
}

.page-about .about-timeline__item {
  position: relative;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 22px;
  width: 11px;
  height: 11px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--acid);
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  background: var(--acid);
  box-shadow: 0 0 0 4px rgba(182, 255, 59, 0.16);
}

.page-about .about-timeline__card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
  padding: 18px 18px 16px;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__card {
  border-color: var(--line-2);
  background: var(--ink-700);
}

.page-about .about-timeline__top {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.page-about .about-timeline__year {
  font-size: 20px;
  font-weight: 700;
  color: var(--paper);
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}

.page-about .about-timeline__card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-timeline__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(232, 240, 235, 0.7);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 32px);
}

.page-about .about-team__figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink-800);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  opacity: 0.88;
}

.page-about .about-team__caption {
  padding: 12px 16px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-team__side {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .about-roles {
  display: grid;
  gap: 16px;
}

.page-about .about-role__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin: 0 0 7px;
  font-size: 14px;
  color: var(--paper);
}

.page-about .about-role__num {
  font-size: 18px;
  font-weight: 700;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-role .meter {
  margin-bottom: 7px;
}

.page-about .about-role__note {
  margin: 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-cadence {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
  padding: 18px;
}

.page-about .about-cadence h3 {
  margin: 0 0 12px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

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

.page-about .about-cadence__list li {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 10px;
  font-size: 13px;
  line-height: 1.62;
  color: rgba(232, 240, 235, 0.72);
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--line-soft);
}

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

.page-about .about-cadence__k {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--acid);
}

/* ---------- 服务与合作 ---------- */
.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: clamp(18px, 2.6vw, 30px);
}

.page-about .about-metric {
  background: var(--ink-800);
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-metric__v {
  font-size: clamp(24px, 2.6vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .about-metric__v em {
  font-style: normal;
  color: var(--acid);
  font-size: 0.7em;
}

.page-about .about-metric__l {
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--muted);
  line-height: 1.5;
}

.page-about .about-eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-eco__card {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(150deg, var(--ink-700), var(--ink-800));
  padding: 20px 18px 18px 44px;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-eco__card:hover,
.page-about .about-eco__card:focus-within {
  border-color: var(--line-2);
  transform: translateY(-2px);
}

.page-about .about-eco__dot {
  position: absolute;
  left: 18px;
  top: 24px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.page-about .about-eco__dot--cyan { background: var(--cyan); box-shadow: 0 0 0 4px rgba(49, 230, 196, 0.14); }
.page-about .about-eco__dot--acid { background: var(--acid); box-shadow: 0 0 0 4px rgba(182, 255, 59, 0.14); }
.page-about .about-eco__dot--violet { background: var(--violet); box-shadow: 0 0 0 4px rgba(124, 92, 255, 0.16); }
.page-about .about-eco__dot--amber { background: var(--amber); box-shadow: 0 0 0 4px rgba(245, 197, 66, 0.14); }

.page-about .about-eco__card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-eco__card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: rgba(232, 240, 235, 0.7);
}

/* ---------- 用户价值 ---------- */
.page-about .about-value {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-value__col {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .about-value__tag {
  margin: 0;
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-value__col h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-value__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  flex: 1;
}

.page-about .about-value__list li {
  position: relative;
  padding-left: 16px;
  font-size: 13.5px;
  line-height: 1.72;
  color: rgba(232, 240, 235, 0.74);
}

.page-about .about-value__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  border-radius: 1px;
  background: var(--acid);
  opacity: 0.8;
}

.page-about .about-value__link {
  align-self: flex-start;
  font-size: 13px;
  font-weight: 700;
  color: var(--paper);
  text-decoration: none;
  padding: 8px 14px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-value__link:hover,
.page-about .about-value__link:focus-visible {
  background: var(--acid);
  border-color: var(--acid);
  color: var(--ink-900);
}

.page-about .about-value__link:focus-visible {
  outline: 2px solid var(--violet);
  outline-offset: 3px;
}

/* ---------- 重庆与备案 ---------- */
.page-about .about-sec--beian {
  border-top: 1px solid var(--line-2);
  padding-bottom: 0;
}

.page-about .about-beian {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 30px);
  align-items: center;
}

.page-about .about-beian__text h2 {
  font-size: clamp(22px, 2.8vw, 32px);
}

.page-about .about-beian__text p {
  margin: 0 0 20px;
  font-size: 14px;
  line-height: 1.82;
  color: rgba(232, 240, 235, 0.74);
  max-width: 60ch;
}

.page-about .about-beian__figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink-800);
}

.page-about .about-beian__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
  opacity: 0.72;
  filter: saturate(0.5);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-lines {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-timeline {
    padding-left: 30px;
  }

  .page-about .about-timeline__item:nth-child(even) {
    margin-left: var(--about-shift);
  }

  .page-about .about-timeline__item:nth-child(even)::before {
    left: calc(-26px - var(--about-shift));
  }

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

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

  .page-about .about-beian {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--bar-h) + 20px);
    padding: 16px 14px 18px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    overflow: visible;
    gap: 4px;
  }

  .page-about .about-rail__link {
    white-space: normal;
    padding: 9px 10px;
  }

  .page-about .about-rail__label {
    font-size: 13px;
  }

  .page-about .about-rail__foot {
    display: block;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-line,
  .page-about .about-eco__card,
  .page-about .about-timeline__card,
  .page-about .about-timeline__item::before,
  .page-about .about-value__link {
    transition: none;
  }

  .page-about .about-line:hover,
  .page-about .about-line:focus-within,
  .page-about .about-eco__card:hover,
  .page-about .about-eco__card:focus-within {
    transform: none;
  }
}
<<<END>>>