/* ===== 品牌使命页 ===== */
.page-about {
  --ab-rail: 262px;
  --ab-line: rgba(22, 27, 30, .16);
  --ab-body-ink: rgba(22, 27, 30, .78);
  --ab-muted-ink: rgba(22, 27, 30, .58);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  background:
    radial-gradient(940px 400px at 86% -14%, rgba(47, 227, 208, .16), transparent 70%),
    radial-gradient(620px 320px at 4% 108%, rgba(255, 90, 43, .12), transparent 72%),
    var(--ink);
  color: var(--paper);
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 8px;
  background: linear-gradient(90deg,
    var(--cyan) 0 30%,
    var(--orange) 30% 54%,
    var(--lime) 54% 68%,
    transparent 68%);
  clip-path: polygon(0 62%, 100% 0, 100% 100%, 0 100%);
  opacity: .9;
}

.page-about .ab-hero__inner {
  padding-top: clamp(26px, 4.6vw, 52px);
  padding-bottom: clamp(48px, 7vw, 84px);
}

.page-about .ab-hero .breadcrumb {
  margin-bottom: clamp(22px, 3.4vw, 38px);
}

.page-about .ab-hero .breadcrumb__item,
.page-about .ab-hero .breadcrumb__sep {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--silver);
}

.page-about .ab-hero .breadcrumb__item a {
  color: var(--cyan);
  text-decoration: none;
}

.page-about .ab-hero .breadcrumb__item a:hover {
  text-decoration: underline;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
}

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

.page-about .ab-hero h1 {
  margin: 14px 0 0;
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 58px);
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .ab-hero__intro {
  margin: 22px 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: rgba(244, 240, 230, .84);
}

.page-about .ab-hero__intro--sub {
  margin-top: 12px;
  color: var(--silver);
  border-left: 2px solid var(--cyan-deep);
  padding-left: 14px;
}

.page-about .ab-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: 18px;
}

.page-about .ab-hero__stat {
  padding: 16px 0 14px;
  border-top: 1px solid var(--line);
}

.page-about .ab-hero__num {
  display: block;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.04;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .ab-hero__num em {
  font-style: normal;
  font-size: .54em;
  color: var(--orange);
  margin-left: 2px;
}

.page-about .ab-hero__num--cyan {
  color: var(--cyan);
}

.page-about .ab-hero__label {
  display: block;
  margin-top: 7px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--silver);
}

/* ---------- 正文区底 ---------- */
.page-about .ab-main {
  background: var(--paper);
  color: var(--paper-ink);
}

.page-about .ab-layout {
  display: grid;
  gap: clamp(26px, 4vw, 54px);
  padding-top: clamp(38px, 6vw, 74px);
  padding-bottom: clamp(48px, 7vw, 92px);
}

/* ---------- 左侧目录 ---------- */
.page-about .ab-toc__title {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ab-muted-ink);
}

.page-about .ab-toc__list {
  list-style: none;
  margin: 0;
  padding: 0 0 14px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-bottom: 1px solid var(--ab-line);
}

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

.page-about .ab-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 0;
  white-space: nowrap;
  font-size: 14px;
  color: var(--ab-muted-ink);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}

.page-about .ab-toc__num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--cyan-deep);
}

.page-about .ab-toc__link:hover,
.page-about .ab-toc__link:focus-visible,
.page-about .ab-toc__link.is-active {
  color: var(--paper-ink);
  border-bottom-color: var(--cyan-deep);
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-body {
  display: grid;
  gap: clamp(52px, 7vw, 88px);
  min-width: 0;
}

.page-about .ab-chapter {
  scroll-margin-top: 116px;
  min-width: 0;
}

.page-about .ab-chapter .section-head {
  display: grid;
  gap: 6px;
  padding-top: 14px;
  border-top: 2px solid var(--paper-ink);
}

.page-about .ab-chapter .sec-num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan-deep);
  transition: color .25s ease;
}

.page-about .ab-chapter .sec-title {
  margin: 0;
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--paper-ink);
}

.page-about .ab-chapter.is-active .sec-num {
  color: var(--orange);
}

.page-about .ab-text {
  margin-top: clamp(18px, 2.4vw, 26px);
  max-width: 68ch;
}

.page-about .ab-text p {
  margin: 0 0 1em;
  font-size: clamp(15px, 1.55vw, 17px);
  line-height: 1.8;
  color: var(--ab-body-ink);
}

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

.page-about .ab-chapter > .note {
  margin: clamp(20px, 2.6vw, 28px) 0 0;
  max-width: 62ch;
}

/* ---------- 图文并排 ---------- */
.page-about .ab-figure-row {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  margin-top: clamp(16px, 2vw, 22px);
}

.page-about .ab-figure-row .ab-text {
  margin-top: 0;
}

.page-about .ab-figure {
  margin: clamp(24px, 3.4vw, 38px) 0 0;
}

.page-about .ab-figure-row .ab-figure {
  margin-top: 0;
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.94) contrast(1.05);
  border: 1px solid var(--ab-line);
}

.page-about .ab-figure .media__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ab-muted-ink);
  border-left: 2px solid var(--line);
  padding-left: 10px;
}

.page-about .ab-figure--portrait {
  max-width: 560px;
}

/* ---------- 沿革时间轴 ---------- */
.page-about .ab-road {
  position: relative;
  list-style: none;
  margin: clamp(26px, 3.6vw, 42px) 0 0;
  padding: 0 0 0 30px;
}

.page-about .ab-road::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 16px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan-deep) 0%, var(--ab-line) 78%, transparent 100%);
}

.page-about .ab-road__item {
  position: relative;
  padding-bottom: 24px;
}

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

.page-about .ab-road__dot {
  position: absolute;
  left: -30px;
  top: 5px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--cyan-deep);
  transition: background-color .25s ease, border-color .25s ease;
}

.page-about .ab-road__expand {
  min-width: 0;
}

.page-about .ab-road__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding: 0;
  background: none;
  border: 0;
  text-align: left;
  cursor: pointer;
  color: inherit;
  font: inherit;
}

.page-about .ab-road__meta {
  display: block;
  min-width: 0;
}

.page-about .ab-road__year {
  display: block;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--orange);
  font-weight: 700;
}

.page-about .ab-road__title {
  display: block;
  margin-top: 5px;
  font-family: var(--display);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.42;
  color: var(--paper-ink);
}

.page-about .ab-road .expand__icon {
  flex: 0 0 auto;
  margin-top: 5px;
  color: var(--cyan-deep);
}

.page-about .ab-road__panel {
  margin-top: 12px;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ab-muted-ink);
}

.page-about .ab-road__panel p {
  margin: 0;
}

.page-about .ab-road__item:hover .ab-road__dot {
  background: var(--lime);
  border-color: var(--ab-body-ink);
}

.page-about .ab-figure--wide {
  margin-top: clamp(28px, 4vw, 44px);
}

/* ---------- 团队两条线 ---------- */
.page-about .ab-team {
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .ab-team__panel {
  border-top: 2px solid var(--paper-ink);
  padding-top: 14px;
  min-width: 0;
}

.page-about .ab-team__head {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  width: 100%;
  padding: 0;
  background: none;
  border: 0;
  text-align: left;
  cursor: pointer;
  color: inherit;
  font: inherit;
}

.page-about .ab-team__mark {
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  margin-top: 6px;
  background: var(--cyan-deep);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
}

.page-about .ab-team__mark--orange {
  background: var(--orange);
}

.page-about .ab-team__meta {
  display: block;
  flex: 1 1 auto;
  min-width: 0;
}

.page-about .ab-team__name {
  display: block;
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(18px, 2vw, 21px);
  letter-spacing: -.01em;
  color: var(--paper-ink);
}

.page-about .ab-team__desc {
  display: block;
  margin-top: 5px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ab-muted-ink);
}

.page-about .ab-team .expand__icon {
  flex: 0 0 auto;
  margin-top: 6px;
  color: var(--cyan-deep);
}

.page-about .ab-team__body {
  margin-top: 12px;
  max-width: 60ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ab-body-ink);
}

.page-about .ab-team__body p {
  margin: 0;
}

/* ---------- 覆盖与指标 ---------- */
.page-about .ab-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 clamp(16px, 2.4vw, 28px);
  margin: clamp(24px, 3.2vw, 34px) 0 clamp(22px, 3vw, 30px);
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-metric {
  padding: 18px 0 16px;
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-metric__num {
  display: block;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1.02;
  letter-spacing: -.02em;
  color: var(--paper-ink);
}

.page-about .ab-metric__num--orange {
  color: var(--orange);
}

.page-about .ab-metric__plus,
.page-about .ab-metric__unit {
  font-size: .5em;
  margin-left: 2px;
  color: var(--cyan-deep);
}

.page-about .ab-metric__label {
  display: block;
  margin-top: 7px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--ab-muted-ink);
}

/* ---------- 站内链接卡 ---------- */
.page-about .ab-links {
  display: grid;
  gap: 0;
  margin-top: clamp(24px, 3vw, 32px);
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-link {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: baseline;
  gap: 6px 16px;
  padding: 16px 2px;
  border-bottom: 1px solid var(--ab-line);
  text-decoration: none;
  transition: padding-left .2s ease, border-color .2s ease;
}

.page-about .ab-link__label {
  font-family: var(--display);
  font-weight: 800;
  font-size: 17px;
  color: var(--paper-ink);
}

.page-about .ab-link__desc {
  grid-column: 1 / -1;
  font-size: 14px;
  color: var(--ab-muted-ink);
}

.page-about .ab-link:hover,
.page-about .ab-link:focus-visible {
  padding-left: 10px;
  border-bottom-color: var(--cyan-deep);
}

.page-about .ab-link:hover .ab-link__label {
  color: var(--cyan-deep);
}

/* ---------- 页尾行动区 ---------- */
.page-about .ab-cta {
  position: relative;
  padding: clamp(26px, 3.6vw, 40px) clamp(20px, 3vw, 36px);
  background: var(--deep);
  color: var(--paper);
  border-left: 4px solid var(--lime);
}

.page-about .ab-cta__lead {
  margin: 0;
  max-width: 52ch;
  font-size: clamp(16px, 1.8vw, 19px);
  line-height: 1.7;
  color: rgba(244, 240, 230, .9);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.page-about .ab-cta .btn--primary {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
}

.page-about .ab-cta .btn--ghost {
  border-color: var(--line-cyan);
  color: var(--cyan);
}

/* ---------- 显现 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .5s ease, transform .5s ease;
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .page-about .ab-link {
    transition: none;
  }
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 640px) {
  .page-about .ab-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    column-gap: clamp(14px, 2vw, 26px);
  }

  .page-about .ab-chapter .section-head {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: baseline;
    column-gap: clamp(16px, 2.4vw, 30px);
  }

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

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

/* ---------- 桌面：左目录 + 右长文 ---------- */
@media (min-width: 960px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(280px, .85fr);
    align-items: end;
  }

  .page-about .ab-figure-row {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: start;
  }
}

@media (min-width: 1020px) {
  .page-about .ab-layout {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-toc {
    position: sticky;
    top: 104px;
  }

  .page-about .ab-toc__list {
    display: block;
    padding: 0 0 0 0;
    border-bottom: 0;
    border-left: 1px solid var(--ab-line);
    overflow-x: visible;
  }

  .page-about .ab-toc__item {
    margin-left: -1px;
  }

  .page-about .ab-toc__link {
    display: grid;
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 10px;
    padding: 11px 0 11px 16px;
    white-space: normal;
    border-bottom: 0;
    border-left: 2px solid transparent;
    font-size: 14px;
    line-height: 1.45;
  }

  .page-about .ab-toc__link:hover,
  .page-about .ab-toc__link:focus-visible,
  .page-about .ab-toc__link.is-active {
    border-bottom-color: transparent;
    border-left-color: var(--cyan-deep);
    color: var(--cyan-deep);
  }
}
<<<END>>>