/* ============ 核心理念页面 · page-about ============ */
.page-about {
  --ab-ruler-w: 96px;
  display: block;
}

.page-about .prose p {
  margin-top: 0;
  margin-bottom: 1.15em;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding-top: clamp(20px, 3vw, 36px);
  padding-bottom: clamp(38px, 5.6vw, 72px);
  overflow: clip;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -14%;
  right: -18%;
  width: min(600px, 78vw);
  aspect-ratio: 1;
  background: radial-gradient(circle at center, var(--blue-soft), rgba(30, 108, 255, 0) 68%);
  pointer-events: none;
  z-index: 0;
}

.page-about .ab-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__body {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  margin-top: clamp(22px, 3.4vw, 36px);
}

.page-about .ab-hero h1 {
  margin: 0.3em 0 0;
  max-width: 15em;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 56px);
  line-height: 1.14;
  letter-spacing: -0.012em;
  color: var(--ink-900);
}

.page-about .ab-hero__lede {
  margin-top: clamp(16px, 2.4vw, 26px);
  max-width: 33em;
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.85;
  color: var(--ink-700);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

/* 速览面板 */
.page-about .ab-hero__aside {
  position: relative;
  padding: clamp(20px, 3vw, 26px);
  border-radius: var(--radius);
  background: var(--glass);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-panel);
}

.page-about .ab-facts {
  margin: 14px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-facts dt {
  flex: 0 0 auto;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-500);
}

.page-about .ab-facts dd {
  margin: 0;
  text-align: right;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-900);
  font-variant-numeric: tabular-nums;
}

/* ---------- 服务对象 ---------- */
.page-about .ab-who-band {
  padding-block: clamp(46px, 6vw, 86px);
}

.page-about .ab-who {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-who__item {
  display: grid;
  gap: 8px 24px;
  padding: clamp(20px, 3vw, 28px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-who__idx {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 700;
  line-height: 1;
  color: var(--blue);
}

.page-about .ab-who__item h3 {
  margin: 0;
  font-size: clamp(17px, 1.6vw, 20px);
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink-900);
}

.page-about .ab-who__item p {
  margin: 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-700);
}

/* ---------- 三条主线 ---------- */
.page-about .ab-lines {
  padding-block: clamp(46px, 6vw, 86px);
}

.page-about .ab-lines__grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .ab-line {
  position: relative;
  padding: clamp(22px, 3vw, 32px);
  border-radius: var(--radius);
  background: var(--paper-000);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .ab-line::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--blue);
}

.page-about .ab-line--mobile::before {
  background: var(--teal);
}

.page-about .ab-line--new::before {
  background: var(--orange);
}

.page-about .ab-line__no {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--ink-500);
}

.page-about .ab-line h3 {
  margin: 12px 0 0;
  font-size: clamp(19px, 1.8vw, 22px);
  font-weight: 800;
  line-height: 1.4;
  color: var(--ink-900);
}

.page-about .ab-line p {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-700);
}

.page-about .ab-line__list {
  list-style: none;
  margin: 18px 0 0;
  padding: 16px 0 0;
  border-top: 1px dashed var(--line-strong);
}

.page-about .ab-line__list li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 8px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-500);
}

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

.page-about .ab-line__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 7px;
  height: 1px;
  background: var(--line-strong);
}

/* ---------- 发展历程 ---------- */
.page-about .ab-history {
  padding-block: clamp(46px, 6vw, 86px);
}

.page-about .ab-history__figure {
  margin: clamp(26px, 4vw, 42px) 0 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .ab-history__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 3;
  object-fit: cover;
}

.page-about .ab-timeline {
  display: grid;
  gap: clamp(22px, 3vw, 38px);
  margin-top: clamp(28px, 4.2vw, 46px);
}

.page-about .ab-ruler ol {
  list-style: none;
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0 0 4px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .ab-ruler li {
  flex: 0 0 auto;
}

.page-about .ab-ruler a {
  display: block;
  padding: 6px 13px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--paper-000);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-500);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background var(--dur) var(--ease);
}

.page-about .ab-ruler a:hover,
.page-about .ab-ruler a:focus-visible {
  color: var(--blue-deep);
  border-color: var(--blue);
  background: var(--blue-soft);
}

.page-about .ab-stages {
  list-style: none;
  display: grid;
  gap: clamp(16px, 2.4vw, 22px);
  margin: 0;
  padding: 0;
}

.page-about .ab-stage {
  display: grid;
  gap: 10px 24px;
  padding: clamp(18px, 2.6vw, 26px);
  border-radius: var(--radius);
  background: var(--paper-000);
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  scroll-margin-top: 84px;
  box-shadow: var(--shadow-panel);
}

.page-about .ab-stage__year {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(20px, 2.6vw, 27px);
  font-weight: 700;
  line-height: 1;
  color: var(--ink-900);
  letter-spacing: 0.02em;
}

.page-about .ab-stage__tag {
  display: inline-block;
  margin-top: 9px;
  padding: 2px 10px;
  border: 1px solid var(--teal);
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--teal-deep);
}

.page-about .ab-stage__body h3 {
  margin: 0;
  font-size: clamp(17px, 1.6vw, 20px);
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink-900);
}

.page-about .ab-stage__body p {
  margin: 10px 0 0;
  max-width: 40em;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-700);
}

/* ---------- 更新安排 ---------- */
.page-about .ab-update {
  padding-block: clamp(46px, 6vw, 86px);
  background: linear-gradient(180deg, var(--paper-100) 0%, var(--paper-000) 100%);
}

.page-about .ab-update__grid {
  display: grid;
  gap: clamp(24px, 3.4vw, 42px);
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .ab-update__prose {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-700);
}

.page-about .ab-update__prose .note {
  margin-bottom: 0;
}

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

.page-about .ab-stats li {
  padding: clamp(16px, 2.4vw, 24px);
  background: var(--paper-000);
}

.page-about .ab-stats__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--blue-deep);
}

.page-about .ab-stats__unit {
  margin-left: 4px;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--ink-500);
}

.page-about .ab-stats p {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ink-500);
}

/* ---------- 团队分工 ---------- */
.page-about .ab-team {
  padding-block: clamp(46px, 6vw, 86px);
}

.page-about .ab-team__grid {
  display: grid;
  gap: clamp(26px, 3.6vw, 44px);
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .ab-team__roles {
  display: grid;
  gap: 14px;
}

.page-about .ab-role {
  position: relative;
  padding: clamp(18px, 2.4vw, 24px) clamp(18px, 2.4vw, 26px);
  border-radius: var(--radius);
  background: var(--paper-000);
  border: 1px solid var(--line);
}

.page-about .ab-role__no {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12.5px;
  letter-spacing: 0.16em;
  color: var(--orange-deep);
}

.page-about .ab-role h3 {
  margin: 8px 0 0;
  font-size: clamp(17px, 1.6vw, 19px);
  font-weight: 700;
  color: var(--ink-900);
}

.page-about .ab-role p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-700);
}

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

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

/* ---------- 服务区域 ---------- */
.page-about .ab-region {
  padding-block: clamp(46px, 6vw, 86px);
}

.page-about .ab-region__grid {
  display: grid;
  gap: clamp(26px, 3.6vw, 44px);
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .ab-region__figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .ab-region__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about .ab-region__text h3 {
  margin: 0 0 12px;
  font-size: clamp(18px, 1.7vw, 21px);
  font-weight: 800;
  line-height: 1.45;
  color: var(--ink-900);
}

.page-about .ab-region__text h3:not(:first-child) {
  margin-top: 30px;
}

.page-about .ab-region__text p {
  margin: 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-700);
}

.page-about .ab-cities {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
}

.page-about .ab-cities li {
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--teal-soft);
  border: 1px solid rgba(0, 179, 155, 0.32);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--teal-deep);
}

/* ---------- 收束 ---------- */
.page-about .ab-cta {
  padding-block: clamp(46px, 6.4vw, 88px);
}

.page-about .ab-cta__eyebrow {
  margin: 0;
  font-size: 12.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--teal);
}

.page-about .ab-cta h2 {
  margin: 16px 0 0;
  max-width: 18em;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(26px, 3.6vw, 42px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: #ffffff;
}

.page-about .ab-cta p {
  margin: 18px 0 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.74);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.2vw, 34px);
}

.page-about .ab-cta .btn--ghost {
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.42);
}

.page-about .ab-cta .btn--ghost:hover,
.page-about .ab-cta .btn--ghost:focus-visible {
  border-color: #ffffff;
  background: rgba(255, 255, 255, 0.1);
}

/* ============ 响应式 ============ */
@media (min-width: 760px) {
  .page-about .ab-who__item {
    grid-template-columns: 64px minmax(0, 240px) minmax(0, 1fr);
    align-items: start;
    gap: 0 30px;
  }

  .page-about .ab-who__idx {
    padding-top: 2px;
  }

  .page-about .ab-stage {
    grid-template-columns: 140px minmax(0, 1fr);
    align-items: start;
    gap: clamp(20px, 3vw, 34px);
    padding: clamp(22px, 2.6vw, 30px) clamp(22px, 3vw, 32px);
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

@media (min-width: 820px) {
  .page-about .ab-lines__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__body {
    grid-template-columns: minmax(0, 1.6fr) minmax(248px, 0.85fr);
    align-items: start;
  }

  .page-about .ab-update__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-about .ab-region__grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: start;
  }

  .page-about .ab-timeline {
    grid-template-columns: var(--ab-ruler-w) minmax(0, 1fr);
    align-items: start;
    gap: clamp(30px, 4vw, 56px);
  }

  .page-about .ab-ruler {
    position: sticky;
    top: 40px;
    align-self: start;
  }

  .page-about .ab-ruler ol {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .ab-ruler a {
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
    background: transparent;
    padding: 11px 0 11px 15px;
    font-size: 15px;
  }

  .page-about .ab-ruler a:hover,
  .page-about .ab-ruler a:focus-visible {
    border-left-color: var(--blue);
    background: linear-gradient(90deg, var(--blue-soft), rgba(30, 108, 255, 0) 82%);
  }
}

@media (min-width: 1100px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
<<<END>>>