.page-about {
  --ab-muted: rgba(195, 201, 218, .94);
  background: var(--ink-900);
  color: var(--snow-50);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: .01em;
  padding-bottom: 48px;
  overflow-x: hidden;
}

.page-about a {
  color: inherit;
  text-decoration: none;
}

.page-about .ab-shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
  box-sizing: border-box;
}

.page-about .ab-section {
  padding-top: 56px;
  padding-bottom: 56px;
}

/* ---------- 通用标题组 ---------- */
.page-about .ab-h2 {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 36px);
  line-height: 1.32;
  letter-spacing: .02em;
  margin: 0 0 14px;
  color: var(--snow-50);
}

.page-about .ab-head {
  margin-bottom: 28px;
}

.page-about .ab-head__note {
  margin: 0;
  max-width: 42em;
  color: var(--ab-muted);
  font-size: 15px;
}

.page-about .ab-eyebrow {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--gold-500);
  margin-bottom: 16px;
}

/* ---------- 经幡五色细带 ---------- */
.page-about .ab-band {
  display: flex;
  height: 3px;
  width: 180px;
  max-width: 60%;
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 24px;
}

.page-about .ab-band span {
  flex: 1 1 0;
}

.page-about .ab-band span:nth-child(1) { background: var(--banner-cyan); }
.page-about .ab-band span:nth-child(2) { background: var(--banner-white); }
.page-about .ab-band span:nth-child(3) { background: var(--banner-red); }
.page-about .ab-band span:nth-child(4) { background: var(--banner-green); }
.page-about .ab-band span:nth-child(5) { background: var(--banner-yellow); }

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding-top: 8px;
  padding-bottom: 48px;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: 32px;
}

.page-about .ab-h1 {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(30px, 7vw, 58px);
  line-height: 1.2;
  letter-spacing: .02em;
  margin: 0 0 20px;
  color: var(--snow-50);
}

.page-about .ab-lead {
  margin: 0 0 16px;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ab-muted);
}

.page-about .ab-lead:last-child {
  margin-bottom: 0;
}

/* ---------- 图片容器 ---------- */
.page-about .ab-media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: var(--line-soft);
  background: linear-gradient(160deg, var(--ink-700), var(--ink-950));
}

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

.page-about .ab-media--portrait {
  aspect-ratio: 11 / 14;
}

.page-about .ab-media--portrait img {
  height: 100%;
}

.page-about .ab-media--wide {
  aspect-ratio: 14 / 9;
}

.page-about .ab-media--wide img {
  height: 100%;
}

.page-about .ab-media__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 28px 18px 14px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--mist-300);
  background: linear-gradient(180deg, rgba(10, 18, 41, 0), rgba(10, 18, 41, .88));
}

/* ---------- 四条业务线 ---------- */
.page-about .ab-four {
  display: grid;
  border-bottom: var(--line-soft);
}

.page-about .ab-four__item {
  padding: 26px 0;
  border-top: var(--line-soft);
}

.page-about .ab-four__num {
  display: block;
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--gold-700);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-four h3 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(19px, 2.4vw, 23px);
  line-height: 1.4;
  letter-spacing: .02em;
  margin: 10px 0 10px;
}

.page-about .ab-four p {
  margin: 0;
  color: var(--ab-muted);
  font-size: 15.5px;
  line-height: 1.85;
}

/* ---------- 大字引言 ---------- */
.page-about .ab-pull {
  padding-top: 48px;
  padding-bottom: 48px;
  border-top: var(--line-soft);
  border-bottom: var(--line-soft);
}

.page-about .ab-pull p {
  margin: 0;
  max-width: 22em;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(21px, 4vw, 36px);
  line-height: 1.5;
  letter-spacing: .02em;
}

.page-about .ab-pull em {
  font-style: normal;
  color: var(--gold-500);
}

/* ---------- 时间线 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 0;
  position: relative;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--gold-700), rgba(51, 80, 143, .35));
}

.page-about .ab-tl-item {
  position: relative;
  padding-left: 34px;
  padding-bottom: 32px;
}

.page-about .ab-tl-item:last-child {
  padding-bottom: 0;
}

.page-about .ab-tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--gold-500);
  box-shadow: 0 0 0 4px rgba(217, 164, 65, .1);
  box-sizing: border-box;
}

.page-about .ab-tl-year {
  display: block;
  font-family: var(--font-sans);
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--gold-500);
  font-variant-numeric: tabular-nums;
  margin-bottom: 4px;
}

.page-about .ab-tl-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(18px, 2.2vw, 21px);
  letter-spacing: .02em;
  margin: 0 0 8px;
}

.page-about .ab-tl-item p {
  margin: 0;
  max-width: 44em;
  color: var(--ab-muted);
  font-size: 15.5px;
}

/* ---------- 服务范围 ---------- */
.page-about .ab-coverage {
  display: grid;
  gap: 32px;
}

.page-about .ab-coverage__text p {
  margin: 0 0 14px;
  max-width: 40em;
  color: var(--ab-muted);
  font-size: 15.5px;
}

.page-about .ab-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin-top: 20px;
  font-size: 13px;
  color: var(--mist-300);
}

.page-about .ab-legend span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .ab-legend i {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--gold-500);
}

.page-about .ab-legend i.is-plain {
  background: rgba(51, 80, 143, .95);
}

.page-about .ab-coverage__viz {
  padding: 24px;
  border-radius: var(--radius-md);
  border: var(--line-soft);
  background: linear-gradient(155deg, rgba(30, 49, 96, .55), rgba(10, 18, 41, .85));
}

.page-about .ab-dots {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .ab-dots .dot {
  fill: rgba(51, 80, 143, .95);
}

.page-about .ab-dots .dot--key {
  fill: var(--gold-500);
}

.page-about .ab-dots__cap {
  margin: 16px 0 0;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--mist-300);
  text-align: center;
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: 28px;
  margin-bottom: 28px;
}

.page-about .ab-team__text p {
  margin: 0 0 14px;
  max-width: 42em;
  color: var(--ab-muted);
  font-size: 15.5px;
}

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 16px;
}

.page-about .ab-stat__value {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: clamp(26px, 4.4vw, 34px);
  line-height: 1.1;
  color: var(--gold-500);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-stat__label {
  margin-top: 6px;
  font-size: 13px;
  color: var(--mist-300);
}

.page-about .ab-team__photo {
  margin-top: 8px;
}

/* ---------- 协作生态 ---------- */
.page-about .ab-partners {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: var(--line-soft);
  background: var(--ink-950);
}

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

.page-about .ab-partners__bg img {
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: .22;
}

.page-about .ab-partners__body {
  position: relative;
  z-index: 1;
  padding: 32px 22px;
}

.page-about .ab-partners__lead {
  margin: 0 0 26px;
  max-width: 44em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ab-muted);
}

.page-about .ab-partners__cols {
  display: grid;
  gap: 22px;
}

.page-about .ab-partners__cols h3 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: .02em;
  margin: 0 0 8px;
  color: var(--gold-300);
}

.page-about .ab-partners__cols p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist-300);
}

/* ---------- 三档服务方案 ---------- */
.page-about .ab-plans {
  display: grid;
  gap: 18px;
}

.page-about .ab-plan {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 26px 22px;
  border-radius: var(--radius-md);
  border: var(--line-soft);
  background: linear-gradient(158deg, rgba(30, 49, 96, .78), rgba(10, 18, 41, .92));
}

.page-about .ab-plan--gold {
  border-color: rgba(217, 164, 65, .55);
}

.page-about .ab-plan__dot {
  display: block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.page-about .ab-plan__dot--cyan { background: var(--banner-cyan); }
.page-about .ab-plan__dot--gold { background: var(--gold-500); }
.page-about .ab-plan__dot--red { background: var(--banner-red); }

.page-about .ab-plan h3 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: .02em;
  margin: 0;
}

.page-about .ab-plan__for {
  margin: 0;
  font-size: 13.5px;
  letter-spacing: .04em;
  color: var(--gold-300);
}

.page-about .ab-plan p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ab-muted);
}

.page-about .ab-plan__link {
  margin-top: auto;
  padding-top: 10px;
}

.page-about .ab-plan__link a {
  display: inline-block;
  font-size: 14px;
  color: var(--gold-500);
  border-bottom: 1px solid rgba(217, 164, 65, .45);
  padding-bottom: 2px;
  transition: color .3s ease, border-color .3s ease;
}

.page-about .ab-plan__link a:hover,
.page-about .ab-plan__link a:focus-visible {
  color: var(--gold-300);
  border-color: var(--gold-300);
}

/* ---------- 认可 ---------- */
.page-about .ab-recogn {
  display: grid;
  gap: 28px;
}

.page-about .ab-recogn__text p {
  margin: 0 0 14px;
  max-width: 42em;
  color: var(--ab-muted);
  font-size: 15.5px;
}

.page-about .ab-recogn__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-recogn__list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 0;
  border-top: var(--line-soft);
  font-size: 15px;
  color: var(--snow-50);
}

.page-about .ab-recogn__list li:last-child {
  border-bottom: var(--line-soft);
}

.page-about .ab-status {
  flex: 0 0 auto;
  display: inline-block;
  width: 10px;
  height: 10px;
  margin-top: 10px;
  border-radius: 50%;
}

.page-about .ab-status--green { background: var(--banner-green); }
.page-about .ab-status--cyan { background: var(--banner-cyan); }
.page-about .ab-status--yellow { background: var(--banner-yellow); }

/* ---------- 收口 ---------- */
.page-about .ab-cta {
  padding: 30px 22px;
  border-radius: var(--radius-lg);
  border: var(--line-soft);
  background:
    radial-gradient(120% 140% at 12% 0%, rgba(217, 164, 65, .14), rgba(217, 164, 65, 0) 60%),
    linear-gradient(160deg, var(--ink-700), var(--ink-950));
}

.page-about .ab-cta p {
  margin: 0 0 22px;
  max-width: 42em;
  color: var(--ab-muted);
  font-size: 15.5px;
}

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

/* ---------- 焦点态 ---------- */
.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--gold-500);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .ab-section {
    padding-top: 80px;
    padding-bottom: 80px;
  }

  .page-about .ab-hero {
    padding-bottom: 64px;
  }

  .page-about .ab-pull {
    padding-top: 64px;
    padding-bottom: 64px;
  }

  .page-about .ab-four {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 48px;
  }

  .page-about .ab-plans {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .ab-partners__cols {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }

  .page-about .ab-partners__body {
    padding: 44px 34px;
  }

  .page-about .ab-cta {
    padding: 44px 40px;
  }
}

@media (min-width: 860px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-coverage {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px 20px;
  }

  .page-about .ab-recogn {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  /* 桌面端时间线：左侧年份刻度 + 右侧内容 */
  .page-about .ab-timeline::before {
    left: 99px;
  }

  .page-about .ab-tl-item {
    padding-left: 140px;
    padding-bottom: 40px;
  }

  .page-about .ab-tl-item::before {
    left: 92px;
    top: 10px;
  }

  .page-about .ab-tl-year {
    position: absolute;
    left: 0;
    top: 4px;
    width: 76px;
    text-align: right;
    margin-bottom: 0;
    font-size: 14px;
  }
}

@media (min-width: 1080px) {
  .page-about .ab-four {
    column-gap: 72px;
  }

  .page-about .ab-four__item {
    padding: 40px 0;
  }

  .page-about .ab-partners__body {
    padding: 60px 56px;
  }
}

/* ---------- 动效退化 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .ab-plan__link a,
  .page-about .ab-plan__link a:hover,
  .page-about .ab-plan__link a:focus-visible {
    transition: none;
  }
}
<<<END>>>