.page-about {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  padding: 84px 0 0;
  line-height: 1.75;
}

@media (min-width: 900px) {
  .page-about {
    padding-top: 108px;
  }
}

.page-about p {
  margin: 0 0 14px;
}

.page-about .ab-crumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--muted);
  padding-bottom: 20px;
}

.page-about .ab-crumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .ab-crumb a:hover {
  color: var(--ink-green);
  border-bottom-color: var(--gold);
}

.page-about .ab-crumb-sep {
  color: var(--gold);
}

.page-about .ab-crumb .crumb-current {
  color: var(--ink-green);
}

/* ---------- 首屏框景 ---------- */
.page-about .ab-hero {
  padding-bottom: 52px;
}

.page-about .ab-hero-frame {
  position: relative;
  border: 1px solid var(--gold-line);
  background: var(--paper-white);
  box-shadow: 0 22px 44px -34px rgba(8, 37, 28, 0.5);
}

.page-about .ab-hero-scale {
  height: 13px;
  border-bottom: 1px solid var(--paper-grey);
  background-image: repeating-linear-gradient(90deg, var(--gold-line) 0 1px, transparent 1px 26px);
  background-repeat: no-repeat;
  background-position: left bottom;
  background-size: 100% 6px;
}

.page-about .ab-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 900px) {
  .page-about .ab-hero-grid {
    grid-template-columns: 1.02fr 0.98fr;
  }
}

.page-about .ab-hero-copy {
  padding: 28px 20px 34px;
}

@media (min-width: 900px) {
  .page-about .ab-hero-copy {
    padding: 54px 48px 58px;
  }
}

.page-about .ab-hero-copy .eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--muted);
  margin: 0 0 10px;
}

.page-about .ab-hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 6.4vw, 52px);
  line-height: 1.18;
  letter-spacing: 0.01em;
  color: var(--ink-green);
  margin: 0 0 18px;
}

.page-about .ab-rule {
  width: 84px;
  height: 2px;
  background: var(--gold);
  margin: 0 0 20px;
}

.page-about .ab-lead {
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--ink);
  max-width: 36em;
}

.page-about .ab-hero-facts {
  list-style: none;
  margin: 26px 0 26px;
  padding: 18px 0 0;
  border-top: 1px solid var(--paper-grey);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 12px;
}

@media (min-width: 640px) {
  .page-about .ab-hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .ab-fact-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: var(--fs-20);
  color: var(--ink-green);
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.page-about .ab-fact-label {
  display: block;
  font-size: var(--fs-12);
  color: var(--muted);
  margin-top: 4px;
}

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

.page-about .ab-hero-figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: var(--ink-green-deep);
  border-top: 1px solid var(--gold-line);
}

@media (min-width: 900px) {
  .page-about .ab-hero-figure {
    aspect-ratio: auto;
    height: 100%;
    min-height: 360px;
    border-top: 0;
    border-left: 1px solid var(--gold-line);
  }
}

.page-about .ab-hero-figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.7) contrast(1.06) sepia(0.16) hue-rotate(74deg);
}

.page-about .ab-hero-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(15, 61, 46, 0.55), rgba(8, 37, 28, 0.12) 46%, rgba(201, 162, 39, 0.3));
  pointer-events: none;
}

/* ---------- 左索引 + 右长卷 ---------- */
.page-about .ab-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  padding-bottom: 80px;
}

@media (min-width: 960px) {
  .page-about .ab-layout {
    grid-template-columns: 28% minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

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

.page-about .ab-index {
  border: 1px solid var(--paper-grey);
  background: var(--paper-white);
  padding: 18px 16px;
}

.page-about .ab-index-title {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--muted);
  margin: 0 0 12px;
}

.page-about .ab-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .ab-index-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 8px;
  font-size: var(--fs-14);
  color: var(--ink);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.page-about .ab-index-link:hover {
  background: var(--paper);
  border-left-color: var(--gold-line);
}

.page-about .ab-index-link[aria-current="true"] {
  background: var(--gold-pale);
  border-left-color: var(--gold);
  color: var(--ink-green);
  font-weight: 600;
}

.page-about .ab-index-num {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--gold);
  letter-spacing: 0.04em;
}

/* ---------- 章节 ---------- */
.page-about .ab-flow > .ab-sec {
  padding: 34px 0 12px;
  border-top: 1px solid var(--paper-grey);
  scroll-margin-top: 108px;
}

.page-about .ab-flow > .ab-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .ab-sec-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 14px;
}

.page-about .ab-sec-num {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  color: var(--gold);
  letter-spacing: 0.06em;
  padding-top: 10px;
}

.page-about .ab-sec-title {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 3.6vw, 32px);
  line-height: 1.32;
  color: var(--ink-green);
  margin: 0;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--gold);
}

.page-about .ab-sec p {
  max-width: 64ch;
  color: var(--ink);
}

/* ---------- 四栏目卡片 ---------- */
.page-about .ab-cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 20px;
}

@media (min-width: 700px) {
  .page-about .ab-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .ab-card {
  background: var(--paper-white);
  border: 1px solid var(--paper-grey);
  padding: 20px 18px;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .ab-card:hover {
  transform: translateY(-2px);
  border-color: var(--gold-line);
  box-shadow: 0 16px 28px -24px rgba(8, 37, 28, 0.55);
}

.page-about .ab-card .eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--gold);
  margin: 0;
}

.page-about .ab-card h3 {
  font-family: var(--font-display);
  font-size: var(--fs-20);
  color: var(--ink-green);
  margin: 6px 0 12px;
}

.page-about .ab-card ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
  font-size: var(--fs-14);
  color: var(--ink);
}

.page-about .ab-card li {
  position: relative;
  padding-left: 16px;
  line-height: 1.7;
}

.page-about .ab-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 8px;
  height: 1px;
  background: var(--gold);
}

/* ---------- 时间线 ---------- */
.page-about .ab-timeline {
  position: relative;
  margin: 24px 0 6px;
  padding-left: 26px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, var(--gold-line), rgba(217, 185, 92, 0.15));
}

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

.page-about .ab-tl-item:last-child {
  padding-bottom: 4px;
}

.page-about .ab-tl-item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--paper);
  border: 1px solid var(--gold);
}

.page-about .ab-tl-year {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: var(--fs-20);
  color: var(--ink-green);
  letter-spacing: 0.04em;
  margin: 0 0 2px;
}

.page-about .ab-tl-title {
  font-family: var(--font-display);
  font-size: var(--fs-16);
  color: var(--ink-green);
  margin: 0 0 6px;
}

.page-about .ab-tl-item p {
  font-size: var(--fs-14);
  margin-bottom: 0;
}

/* ---------- 图片容器 ---------- */
.page-about .ab-figure {
  position: relative;
  margin: 26px 0 0;
  overflow: hidden;
  border: 1px solid var(--gold-line);
  background: var(--ink-green-deep);
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.7) contrast(1.05) sepia(0.16) hue-rotate(74deg) brightness(0.97);
}

.page-about .ab-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(140deg, rgba(15, 61, 46, 0.42), rgba(8, 37, 28, 0.06) 55%, rgba(201, 162, 39, 0.22));
  pointer-events: none;
}

/* ---------- 团队环形图 ---------- */
.page-about .ab-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  align-items: center;
  margin: 22px 0 6px;
}

@media (min-width: 760px) {
  .page-about .ab-team {
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 36px;
  }
}

.page-about .ab-donut {
  width: 100%;
  max-width: 260px;
  height: auto;
  margin: 0 auto;
  display: block;
}

.page-about .ab-ring {
  fill: none;
  stroke-width: 26;
  transition: stroke-width 0.2s ease;
}

.page-about .ab-ring--data {
  stroke: var(--ink-green);
  stroke-dasharray: 171.04 268.78;
  stroke-dashoffset: 0;
}

.page-about .ab-ring--edit {
  stroke: var(--gold);
  stroke-dasharray: 146.61 293.21;
  stroke-dashoffset: -171.04;
}

.page-about .ab-ring--ops {
  stroke: var(--muted);
  stroke-dasharray: 122.17 317.65;
  stroke-dashoffset: -317.65;
}

.page-about .ab-donut-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 34px;
  fill: var(--ink-green);
}

.page-about .ab-donut-cap {
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 0.14em;
  fill: var(--muted);
}

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

.page-about .ab-legend li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: start;
  gap: 12px;
  padding: 12px 14px;
  background: var(--paper-white);
  border: 1px solid var(--paper-grey);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .ab-legend li:hover {
  border-color: var(--gold-line);
  transform: translateY(-2px);
}

.page-about .ab-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-top: 7px;
}

.page-about .ab-dot--data {
  background: var(--ink-green);
}

.page-about .ab-dot--edit {
  background: var(--gold);
}

.page-about .ab-dot--ops {
  background: var(--muted);
}

.page-about .ab-legend-text {
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--ink);
}

.page-about .ab-legend-text strong {
  color: var(--ink-green);
  font-weight: 600;
}

.page-about .ab-legend-pct {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--muted);
  padding-top: 3px;
}

.page-about .ab-inline-link {
  color: var(--ink-green);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .ab-inline-link:hover {
  color: var(--gold);
  border-bottom-color: var(--ink-green);
}

/* ---------- 数据流程 ---------- */
.page-about .ab-steps {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  border-top: 1px solid var(--paper-grey);
}

.page-about .ab-step {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--paper-grey);
}

.page-about .ab-step-num {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  color: var(--gold);
  padding-top: 2px;
  letter-spacing: 0.06em;
}

.page-about .ab-step h3 {
  font-family: var(--font-display);
  font-size: var(--fs-16);
  color: var(--ink-green);
  margin: 0 0 4px;
}

.page-about .ab-step p {
  margin: 0;
  font-size: var(--fs-14);
  color: var(--ink);
}

/* ---------- 服务规模 ---------- */
.page-about .ab-scale {
  margin: 22px 0 20px;
  padding: 22px 18px;
  background: var(--gold-pale);
  border: 1px solid var(--gold-line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 14px;
}

@media (min-width: 720px) {
  .page-about .ab-scale {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    padding: 26px 24px;
  }
}

.page-about .ab-scale-item {
  border-left: 1px solid rgba(15, 61, 46, 0.25);
  padding-left: 12px;
}

.page-about .ab-scale-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: var(--fs-20);
  color: var(--ink-green);
  line-height: 1.3;
}

.page-about .ab-scale-label {
  display: block;
  font-size: var(--fs-12);
  color: var(--ink-green);
  margin-top: 4px;
  letter-spacing: 0.02em;
}

/* ---------- 下一步 ---------- */
.page-about .ab-next {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 20px;
}

@media (min-width: 700px) {
  .page-about .ab-next {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .ab-next-link {
  display: block;
  padding: 18px 16px 20px;
  background: var(--ink-green);
  color: var(--paper);
  text-decoration: none;
  border: 1px solid var(--ink-green);
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-about .ab-next-link:hover {
  background: var(--paper-white);
  color: var(--ink-green);
  border-color: var(--gold);
}

.page-about .ab-next-kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--gold);
  margin-bottom: 8px;
}

.page-about .ab-next-link:hover .ab-next-kicker {
  color: var(--gold);
}

.page-about .ab-next-title {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-20);
  line-height: 1.4;
  margin-bottom: 6px;
}

.page-about .ab-next-desc {
  display: block;
  font-size: var(--fs-14);
  line-height: 1.7;
  opacity: 0.88;
}

/* ---------- 返回顶部 ---------- */
.page-about .ab-top {
  position: fixed;
  right: 14px;
  bottom: 14px;
  z-index: 20;
  display: inline-flex;
  align-items: center;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--paper);
  background: var(--ink-green-deep);
  border: 1px solid var(--gold-line);
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.page-about .ab-top:hover {
  color: var(--gold);
  border-color: var(--gold);
  background: var(--ink-green);
}

@media (min-width: 900px) {
  .page-about .ab-top {
    right: 26px;
    bottom: 26px;
  }
}