.page-about {
  --ab-line: rgba(18, 18, 18, 0.14);
  --ab-line-strong: rgba(18, 18, 18, 0.3);
  --ab-paper-2: #EFE5D7;
  --ab-shadow: 0 12px 30px rgba(18, 18, 18, 0.09);
  background: var(--fx-paper);
  color: var(--fx-ink);
  font-family: var(--fx-font);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--fx-ink);
  color: var(--fx-white);
  padding: calc(var(--fx-header-h) + 40px) 0 44px;
}

.page-about .ab-hero__shard {
  position: absolute;
  z-index: -1;
  top: -12%;
  right: -46%;
  width: 110%;
  height: 128%;
  background: linear-gradient(150deg, var(--fx-orange), var(--fx-ember) 70%, #7d2a06);
  opacity: 0.26;
  clip-path: polygon(42% 0, 100% 0, 100% 100%, 8% 100%);
}

.page-about .ab-hero__rule {
  position: absolute;
  z-index: -1;
  left: 0;
  bottom: 26%;
  width: 62%;
  height: 2px;
  background: linear-gradient(90deg, var(--fx-orange), var(--fx-blue) 55%, transparent);
  opacity: 0.7;
}

.page-about .ab-hero__eyebrow {
  color: var(--fx-warm-gray);
  margin: 0 0 18px;
}

.page-about .ab-hero__title {
  margin: 0;
  font-weight: 900;
  font-size: clamp(2.1rem, 8.4vw, 4.4rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
}

.page-about .ab-hero__title span {
  color: var(--fx-orange);
}

.page-about .ab-hero__lead {
  margin: 20px 0 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.82);
}

.page-about .ab-hero__stats {
  list-style: none;
  margin: 30px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px 10px;
}

.page-about .ab-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .ab-hero__num {
  font-family: var(--fx-font-num);
  font-weight: 800;
  font-size: clamp(1.5rem, 6vw, 2.3rem);
  line-height: 1;
  color: var(--fx-white);
}

.page-about .ab-hero__unit {
  font-size: 0.5em;
  margin-left: 2px;
  color: var(--fx-orange);
}

.page-about .ab-hero__key {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--fx-warm-gray);
  line-height: 1.5;
}

/* ---------- 面包屑 ---------- */
.page-about .ab-crumb {
  padding: 18px 0 0;
}

/* ---------- 主体布局 ---------- */
.page-about .ab-body {
  padding: 22px 0 56px;
}

/* ---------- 章节索引 ---------- */
.page-about .ab-index {
  border-top: 1px solid var(--ab-line);
  border-bottom: 1px solid var(--ab-line);
  padding: 12px 0;
  margin-bottom: 12px;
}

.page-about .ab-index__label {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--fx-warm-deep);
}

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

.page-about .ab-index__list::-webkit-scrollbar {
  display: none;
}

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

.page-about .ab-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 10px;
  border: 1px solid var(--ab-line);
  border-radius: var(--fx-radius);
  color: var(--fx-ink-soft);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.page-about .ab-index__link .fx-num {
  font-family: var(--fx-font-num);
  font-weight: 800;
  color: var(--fx-orange);
  font-size: 12px;
}

.page-about .ab-index__link:hover,
.page-about .ab-index__link:focus-visible {
  border-color: var(--fx-orange);
  color: var(--fx-ink);
}

.page-about .ab-index__link[aria-current] {
  background: var(--fx-ink);
  border-color: var(--fx-ink);
  color: var(--fx-white);
}

.page-about .ab-index__link[aria-current] .fx-num {
  color: var(--fx-green);
}

/* ---------- 章节 ---------- */
.page-about .ab-chapter {
  padding: 34px 0 38px;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-chapter:first-child {
  border-top: 0;
  padding-top: 10px;
}

.page-about .ab-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 14px;
}

.page-about .ab-chapter__no {
  font-family: var(--fx-font-num);
  font-weight: 800;
  font-size: 26px;
  line-height: 1;
  color: var(--fx-orange);
  letter-spacing: 0.02em;
}

.page-about .ab-chapter__title {
  margin: 0;
  font-size: clamp(1.3rem, 5vw, 2rem);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.005em;
}

.page-about .ab-chapter__lead {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.7;
  color: var(--fx-ink);
  max-width: 58ch;
}

.page-about .ab-chapter__text {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--fx-ink-soft);
  max-width: 62ch;
}

.page-about .ab-chapter__note {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--fx-orange);
  font-size: 13px;
  line-height: 1.7;
  color: var(--fx-warm-deep);
  max-width: 60ch;
}

.page-about .ab-inline-link {
  color: var(--fx-blue);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.page-about .ab-inline-link:hover,
.page-about .ab-inline-link:focus-visible {
  color: var(--fx-orange);
}

/* ---------- 图片 ---------- */
.page-about .ab-figure {
  margin: 22px 0 0;
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--fx-radius);
  background: var(--ab-paper-2);
  box-shadow: var(--ab-shadow);
}

.page-about .ab-figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--fx-warm-deep);
  letter-spacing: 0.02em;
}

/* ---------- 三块主张 ---------- */
.page-about .ab-pillars {
  display: grid;
  gap: 14px;
  margin-top: 6px;
}

.page-about .ab-pillar {
  padding: 20px 18px;
  background: var(--fx-white);
  border: 1px solid var(--ab-line);
  border-top: 3px solid var(--fx-orange);
  box-shadow: var(--ab-shadow);
}

.page-about .ab-pillar__label {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--fx-warm-deep);
}

.page-about .ab-pillar__title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 900;
  line-height: 1.35;
}

.page-about .ab-pillar__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--fx-ink-soft);
}

.page-about .ab-pillar--dark {
  background: var(--fx-charcoal);
  border-color: var(--fx-charcoal);
  border-top-color: var(--fx-green);
  color: var(--fx-white);
}

.page-about .ab-pillar--dark .ab-pillar__label {
  color: var(--fx-green);
}

.page-about .ab-pillar--dark .ab-pillar__text {
  color: rgba(255, 255, 255, 0.82);
}

/* ---------- 时间线 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: 20px 0 26px;
  padding: 0 0 0 16px;
  border-left: 1px solid var(--ab-line-strong);
  display: grid;
  gap: 4px;
}

.page-about .ab-timeline__item {
  position: relative;
  padding: 0 0 16px 18px;
}

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  left: -21px;
  top: 7px;
  width: 9px;
  height: 9px;
  background: var(--fx-orange);
  transform: rotate(45deg);
}

.page-about .ab-timeline__entry {
  border: 1px solid var(--ab-line);
  background: var(--fx-white);
  padding: 12px 14px;
}

.page-about .ab-timeline__entry[open] {
  border-color: var(--fx-orange);
  box-shadow: var(--ab-shadow);
}

.page-about .ab-timeline__summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 10px;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.5;
}

.page-about .ab-timeline__summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-timeline__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--fx-font-num);
  font-size: 16px;
  color: var(--fx-orange);
}

.page-about .ab-timeline__entry[open] .ab-timeline__summary::after {
  content: "–";
}

.page-about .ab-timeline__gen {
  font-family: var(--fx-font-num);
  font-weight: 800;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--fx-white);
  background: var(--fx-ink);
  padding: 3px 7px;
}

.page-about .ab-timeline__label {
  flex: 1 1 60%;
  color: var(--fx-ink);
}

.page-about .ab-timeline__body {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--fx-ink-soft);
  border-top: 1px dashed var(--ab-line);
  padding-top: 10px;
}

/* ---------- 路径对比 ---------- */
.page-about .ab-tabs {
  margin-top: 8px;
}

.page-about .ab-tabs__list {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--ab-line-strong);
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .ab-tabs__list::-webkit-scrollbar {
  display: none;
}

.page-about .ab-tabs__tab.fx-tab {
  flex: 1 0 auto;
  padding: 10px 14px;
  border: 1px solid transparent;
  border-bottom: 0;
  background: transparent;
  font-family: var(--fx-font);
  font-size: 13px;
  font-weight: 700;
  color: var(--fx-warm-deep);
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.page-about .ab-tabs__tab[aria-selected="true"] {
  color: var(--fx-ink);
  background: var(--fx-white);
  border-color: var(--fx-line);
  border-bottom-color: var(--fx-white);
  margin-bottom: -1px;
  box-shadow: inset 0 3px 0 var(--fx-orange);
}

.page-about .ab-tabs__tab:focus-visible {
  outline: 2px solid var(--fx-blue);
  outline-offset: -2px;
}

.page-about .ab-tabs__panel {
  padding: 18px 0 0;
}

.page-about .ab-tabs__note {
  margin: 12px 0 0;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--fx-warm-deep);
}

.page-about .ab-steps {
  list-style: none;
  counter-reset: abstep;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .ab-steps li {
  counter-increment: abstep;
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  padding: 10px 12px;
  background: var(--fx-white);
  border: 1px solid var(--ab-line);
  font-size: 14px;
  line-height: 1.6;
  color: var(--fx-ink-soft);
}

.page-about .ab-steps li::before {
  content: counter(abstep, decimal-leading-zero);
  font-family: var(--fx-font-num);
  font-weight: 800;
  font-size: 14px;
  color: var(--fx-orange);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: 12px;
  margin-top: 6px;
}

.page-about .ab-team__card {
  padding: 18px;
  background: var(--fx-white);
  border: 1px solid var(--ab-line);
  box-shadow: var(--ab-shadow);
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}

.page-about .ab-team__card:hover,
.page-about .ab-team__card:focus-within {
  transform: translateY(-4px);
  border-color: var(--fx-orange);
}

.page-about .ab-team__name {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 900;
  line-height: 1.4;
}

.page-about .ab-team__text {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--fx-ink-soft);
}

.page-about .ab-team__tags {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .ab-team__tag {
  font-size: 11px;
  letter-spacing: 0.1em;
  padding: 4px 9px;
  border: 1px solid var(--ab-line);
  color: var(--fx-warm-deep);
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-about .ab-team__card:hover .ab-team__tag,
.page-about .ab-team__card:focus-within .ab-team__tag {
  background: var(--fx-orange);
  border-color: var(--fx-orange);
  color: var(--fx-ink);
}

/* ---------- 标准 ---------- */
.page-about .ab-standards {
  display: grid;
  gap: 20px;
  margin-top: 8px;
}

.page-about .ab-standard {
  padding-left: 16px;
  border-left: 3px solid var(--fx-orange);
}

.page-about .ab-standard:nth-child(2) {
  border-left-color: var(--fx-blue);
}

.page-about .ab-standard__title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 900;
  line-height: 1.4;
}

.page-about .ab-standard__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--fx-ink-soft);
}

.page-about .ab-checks {
  list-style: none;
  counter-reset: abcheck;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 7px;
}

.page-about .ab-checks li {
  counter-increment: abcheck;
  position: relative;
  padding-left: 26px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--fx-ink-soft);
}

.page-about .ab-checks li::before {
  content: counter(abcheck);
  position: absolute;
  left: 0;
  top: 2px;
  width: 18px;
  height: 18px;
  display: grid;
  place-items: center;
  font-family: var(--fx-font-num);
  font-size: 11px;
  font-weight: 800;
  color: var(--fx-ink);
  background: var(--fx-green);
}

.page-about .ab-metrics {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

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

.page-about .ab-metric__num {
  font-family: var(--fx-font-num);
  font-weight: 800;
  font-size: 30px;
  line-height: 1;
  color: var(--fx-ink);
}

.page-about .ab-metric__unit {
  font-size: 0.45em;
  margin-left: 2px;
  color: var(--fx-orange);
}

.page-about .ab-metric__key {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--fx-warm-deep);
  line-height: 1.5;
}

/* ---------- 承诺 ---------- */
.page-about .ab-pledge {
  margin-top: 6px;
  padding: 24px 18px;
  background: var(--fx-charcoal);
  color: var(--fx-white);
  border-top: 3px solid var(--fx-orange);
}

.page-about .ab-pledge__lead {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.86);
  max-width: 54ch;
}

.page-about .ab-pledge__list {
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-pledge__row {
  display: grid;
  gap: 4px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}

.page-about .ab-pledge__key {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--fx-warm-gray);
}

.page-about .ab-pledge__val {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--fx-white);
  word-break: break-word;
}

.page-about .ab-actions {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .ab-actions .fx-btn {
  flex: 1 1 auto;
  text-align: center;
}

/* ---------- 桌面 ---------- */
@media (min-width: 760px) {
  .page-about .ab-hero {
    padding: calc(var(--fx-header-h) + 56px) 0 58px;
  }

  .page-about .ab-hero__lead {
    font-size: 17px;
    margin-top: 24px;
  }

  .page-about .ab-hero__stats {
    max-width: 720px;
  }

  .page-about .ab-pillars {
    grid-template-columns: 1.05fr 0.95fr;
  }

  .page-about .ab-pillar:nth-child(3) {
    grid-column: 1 / -1;
  }

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

  .page-about .ab-standards {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }

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

  .page-about .ab-pledge {
    padding: 34px 32px;
  }

  .page-about .ab-pledge__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .ab-pledge__row {
    border-bottom: 0;
    border-left: 1px solid rgba(255, 255, 255, 0.18);
    padding: 0 0 0 14px;
  }

  .page-about .ab-actions {
    gap: 12px;
  }

  .page-about .ab-actions .fx-btn {
    flex: 0 0 auto;
  }
}

@media (min-width: 1000px) {
  .page-about .ab-hero {
    padding: calc(var(--fx-header-h) + 78px) 0 76px;
  }

  .page-about .ab-hero__inner {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    grid-template-areas:
      "eyebrow eyebrow"
      "title lead"
      "stats stats";
    column-gap: 56px;
    align-items: end;
  }

  .page-about .ab-hero__eyebrow {
    grid-area: eyebrow;
  }

  .page-about .ab-hero__title {
    grid-area: title;
    font-size: clamp(3.2rem, 5.4vw, 5rem);
  }

  .page-about .ab-hero__lead {
    grid-area: lead;
    margin: 0 0 6px;
    padding-left: 18px;
    border-left: 2px solid var(--fx-orange);
  }

  .page-about .ab-hero__stats {
    grid-area: stats;
    margin-top: 42px;
    max-width: none;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    padding-top: 26px;
  }

  .page-about .ab-hero__stat + .ab-hero__stat {
    border-left: 1px solid rgba(255, 255, 255, 0.16);
    padding-left: 26px;
  }

  .page-about .ab-crumb {
    padding-top: 22px;
  }

  .page-about .ab-body {
    display: grid;
    grid-template-columns: 168px minmax(0, 1fr);
    column-gap: 60px;
    padding: 30px 0 96px;
  }

  .page-about .ab-index {
    position: sticky;
    top: calc(var(--fx-header-h) + 34px);
    align-self: start;
    border-top: 0;
    border-bottom: 0;
    border-left: 1px solid var(--ab-line-strong);
    padding: 4px 0 4px 16px;
    margin: 0;
  }

  .page-about .ab-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-about .ab-index__link {
    border-color: transparent;
    padding: 6px 8px;
    width: 100%;
    justify-content: flex-start;
  }

  .page-about .ab-index__link[aria-current] {
    background: transparent;
    border-color: transparent;
    color: var(--fx-ink);
    font-weight: 700;
    box-shadow: inset 3px 0 0 var(--fx-orange);
  }

  .page-about .ab-index__link[aria-current] .fx-num {
    color: var(--fx-orange);
  }

  .page-about .ab-chapter {
    padding: 46px 0 52px;
  }

  .page-about .ab-chapter:first-child {
    padding-top: 4px;
  }

  .page-about .ab-chapter__head {
    gap: 18px;
    margin-bottom: 18px;
  }

  .page-about .ab-chapter__no {
    font-size: 38px;
  }

  .page-about .ab-chapter__lead {
    font-size: 18px;
  }

  .page-about .ab-chapter__text {
    font-size: 16px;
  }

  .page-about .ab-figure--wide {
    margin-left: -34px;
    margin-right: 40px;
    margin-top: 30px;
  }

  .page-about .ab-figure--tall {
    margin-top: 30px;
    margin-right: 72px;
  }

  .page-about .ab-figure--offset {
    margin-left: 60px;
    margin-right: -28px;
    margin-top: 30px;
  }

  .page-about .ab-pillars {
    grid-template-columns: 1.1fr 0.9fr 1.15fr;
    gap: 16px;
    align-items: start;
  }

  .page-about .ab-pillar:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .ab-pillar:nth-child(3) {
    grid-column: auto;
    margin-top: 52px;
  }

  .page-about .ab-pillar {
    padding: 24px 22px;
  }

  .page-about .ab-pillar__title {
    font-size: 18px;
  }

  .page-about .ab-timeline {
    margin: 26px 0 34px;
    padding-left: 22px;
  }

  .page-about .ab-timeline__item {
    padding-left: 26px;
    padding-bottom: 18px;
  }

  .page-about .ab-timeline__entry {
    padding: 16px 20px;
  }

  .page-about .ab-tabs__list {
    justify-content: flex-start;
  }

  .page-about .ab-tabs__tab.fx-tab {
    flex: 0 0 auto;
    padding: 12px 22px;
    font-size: 14px;
  }

  .page-about .ab-team__card {
    padding: 22px 20px;
  }

  .page-about .ab-metric {
    padding: 22px 18px;
  }

  .page-about .ab-metric__num {
    font-size: 40px;
  }
}
<<<END>>>