.page-about {
  --ab-dark: var(--ink);
  --ab-grid-line: rgba(127, 168, 191, 0.14);
  display: block;
}

.page-about section[id] {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 42px) 0 46px;
  background: linear-gradient(158deg, var(--ink) 0%, var(--steel) 52%, var(--blue) 100%);
  color: #fff;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--ab-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--ab-grid-line) 1px, transparent 1px);
  background-size: 58px 58px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), rgba(0, 0, 0, 0.1));
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), rgba(0, 0, 0, 0.1));
}

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

.page-about .ab-hero .breadcrumb a {
  color: rgba(232, 238, 242, 0.78);
}

.page-about .ab-hero .breadcrumb span[aria-current="page"] {
  color: var(--amber-soft);
}

.page-about .ab-hero-grid {
  display: grid;
  gap: 28px;
  margin-top: 22px;
}

.page-about .ab-hero-main h1 {
  font-family: var(--font-head);
  font-weight: 700;
  font-stretch: 87.5%;
  font-size: clamp(34px, 8.4vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 10px 0 18px;
  color: #fff;
}

.page-about .ab-hero .lede {
  max-width: 40em;
  color: rgba(232, 238, 242, 0.86);
  font-size: 16.5px;
  line-height: 1.78;
}

.page-about .ab-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .ab-hero-side {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  align-content: start;
}

.page-about .ab-fact {
  position: relative;
  padding: 16px 14px 16px 16px;
  border: 1px solid rgba(127, 168, 191, 0.38);
  border-left: 3px solid var(--mist);
  background: rgba(14, 27, 38, 0.34);
  backdrop-filter: blur(2px);
}

.page-about .ab-fact-amber {
  border-left-color: var(--amber);
}

.page-about .ab-fact-teal {
  border-left-color: var(--teal);
}

.page-about .ab-fact-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 6vw, 34px);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.1;
  color: var(--amber-soft);
}

.page-about .ab-fact-teal .ab-fact-num {
  color: #4fd3bd;
}

.page-about .ab-fact-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(232, 238, 242, 0.74);
}

.page-about .ab-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 34px;
  padding-top: 18px;
  border-top: 1px solid rgba(127, 168, 191, 0.34);
}

.page-about .ab-toc a {
  display: inline-block;
  padding: 6px 13px;
  border: 1px solid rgba(127, 168, 191, 0.42);
  color: rgba(232, 238, 242, 0.9);
  font-size: 13.5px;
  text-decoration: none;
  transition: background 180ms ease, border-color 180ms ease, color 180ms ease;
}

.page-about .ab-toc a:hover,
.page-about .ab-toc a:focus-visible {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--ink);
}

/* ---------- 引言 ---------- */
.page-about .ab-intro-grid {
  display: grid;
  gap: 22px;
}

.page-about .ab-intro-head h2 {
  margin-top: 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-stretch: 87.5%;
  font-size: clamp(25px, 6vw, 38px);
  line-height: 1.18;
  color: var(--ink);
}

.page-about .ab-intro-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-intro-list li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 11px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
}

.page-about .ab-intro-list .mono {
  flex: 0 0 auto;
  min-width: 3.6em;
  color: var(--blue);
  font-weight: 700;
}

/* ---------- 发展历程 ---------- */
.page-about .ab-era {
  margin-top: 34px;
  margin-left: 6px;
  border-left: 1px solid var(--line);
}

.page-about .ab-era .acc-item {
  position: relative;
  padding-left: 22px;
}

.page-about .ab-era .acc-item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 24px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--teal);
}

.page-about .ab-era .acc-item:last-child::before {
  background: var(--amber);
  box-shadow: 0 0 0 3px rgba(255, 138, 30, 0.22), 0 0 0 1px var(--amber);
}

.page-about .ab-era .acc-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  width: 100%;
  padding: 15px 0;
  border: 0;
  border-bottom: 1px solid var(--line-soft);
  background: none;
  text-align: left;
  cursor: pointer;
  font-family: var(--font-head);
  color: var(--ink);
}

.page-about .ab-era .acc-index {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--blue);
}

.page-about .ab-era .acc-title {
  flex: 1 1 auto;
  font-size: clamp(18px, 4.6vw, 23px);
  font-weight: 600;
  font-stretch: 87.5%;
  line-height: 1.34;
}

.page-about .ab-era .acc-icon {
  flex: 0 0 auto;
  position: relative;
  width: 14px;
  height: 14px;
  align-self: center;
}

.page-about .ab-era .acc-icon::before,
.page-about .ab-era .acc-icon::after {
  content: "";
  position: absolute;
  background: var(--blue);
}

.page-about .ab-era .acc-icon::before {
  top: 6px;
  left: 0;
  width: 14px;
  height: 1.5px;
}

.page-about .ab-era .acc-icon::after {
  top: 0;
  left: 6px;
  width: 1.5px;
  height: 14px;
  transition: opacity 200ms ease;
}

.page-about .ab-era .acc-head[aria-expanded="true"] .acc-icon::after {
  opacity: 0;
}

.page-about .ab-era .acc-body {
  padding: 20px 0 30px;
}

.page-about .ab-era .acc-body > p {
  max-width: 68ch;
  color: var(--text);
  font-size: 15.5px;
  line-height: 1.78;
}

.page-about .ab-era .acc-body > p + p {
  margin-top: 12px;
}

.page-about .ab-era-media {
  display: grid;
  gap: 20px;
}

.page-about .ab-era-tagline {
  margin-top: 20px;
  padding-left: 12px;
  border-left: 3px solid var(--amber);
  font-size: 13px !important;
  letter-spacing: 0.04em;
  color: var(--blue) !important;
  font-weight: 700;
}

.page-about .ab-era-points {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-era-points li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--text);
}

.page-about .ab-era-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  background: var(--grey);
  border: 1px solid var(--teal);
}

.page-about .ab-era-points .mono {
  color: var(--blue);
  font-weight: 700;
}

.page-about .ab-era-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.page-about .ab-era-col {
  padding: 14px 14px 12px;
  background: var(--paper);
  border-top: 2px solid var(--teal);
}

.page-about .ab-era-col-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.02em;
}

.page-about .ab-era-col p {
  margin-top: 6px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .ab-era-link {
  margin-top: 16px;
  font-size: 14.5px;
  color: var(--muted);
}

.page-about .ab-era-link a,
.page-about .ab-era .acc-body a,
.page-about .ab-quality a,
.page-about .ab-svc a {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 业务 ---------- */
.page-about .ab-service-grid {
  display: grid;
  gap: 16px;
  margin-top: 32px;
}

.page-about .ab-svc {
  padding: 24px 22px;
  background: var(--paper);
  border-top: 3px solid var(--blue);
}

.page-about .ab-svc h3 {
  margin: 10px 0 12px;
  font-family: var(--font-head);
  font-weight: 700;
  font-stretch: 87.5%;
  font-size: clamp(20px, 5vw, 26px);
  line-height: 1.24;
  color: var(--ink);
}

.page-about .ab-svc p {
  font-size: 15px;
  line-height: 1.76;
  color: var(--text);
}

.page-about .ab-svc-tag {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 3px 10px;
  color: var(--ink);
  background: var(--amber-soft);
}

.page-about .ab-svc-a {
  border-top-color: var(--blue);
}

.page-about .ab-svc-a .ab-svc-tag {
  background: rgba(44, 92, 122, 0.14);
  color: var(--blue);
}

.page-about .ab-svc-b {
  border-top-color: var(--amber);
}

.page-about .ab-svc-c {
  border-top-color: var(--teal);
  display: grid;
  gap: 16px;
}

.page-about .ab-svc-c .ab-svc-tag {
  background: rgba(18, 160, 138, 0.16);
  color: var(--teal-deep);
}

.page-about .ab-svc-out,
.page-about .ab-svc-fit {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
  font-size: 14px;
  color: var(--muted);
}

.page-about .ab-svc-out span,
.page-about .ab-svc-fit span {
  display: inline-block;
  margin-right: 8px;
  padding: 2px 8px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ink);
  background: var(--grey);
}

.page-about .ab-svc-c-body p + p {
  margin-top: 12px;
}

.page-about .ab-svc-c-link {
  font-size: 14.5px;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  background: var(--steel);
  color: #fff;
}

.page-about .ab-team .section-head h2 {
  color: #fff;
}

.page-about .ab-team .section-head .lede {
  color: rgba(232, 238, 242, 0.78);
}

.page-about .ab-team .eyebrow {
  color: var(--amber-soft);
}

.page-about .ab-team-grid {
  display: grid;
  gap: 34px;
  margin-top: 34px;
}

.page-about .ab-bar-row + .ab-bar-row {
  margin-top: 22px;
}

.page-about .ab-bar-label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  font-size: 15px;
  color: #fff;
}

.page-about .ab-bar-label .mono {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--amber-soft);
  letter-spacing: 0.02em;
}

.page-about .ab-bar-track {
  display: block;
  height: 14px;
  margin-top: 9px;
  background: rgba(127, 168, 191, 0.22);
}

.page-about .ab-bar-fill {
  display: block;
  width: var(--pct);
  height: 100%;
  transition: width 180ms ease, background 180ms ease;
}

.page-about .ab-bar-amber {
  background: linear-gradient(90deg, var(--amber) 0%, var(--amber-soft) 100%);
}

.page-about .ab-bar-teal {
  background: linear-gradient(90deg, var(--teal-deep) 0%, var(--teal) 100%);
}

.page-about .ab-bar-mist {
  background: linear-gradient(90deg, var(--blue) 0%, var(--mist) 100%);
}

.page-about .ab-bar-row:hover .ab-bar-fill,
.page-about .ab-bar-row:focus-within .ab-bar-fill {
  filter: brightness(1.12);
}

.page-about .ab-bar-note {
  margin-top: 9px;
  font-size: 13.5px;
  line-height: 1.66;
  color: rgba(232, 238, 242, 0.72);
  max-width: 52ch;
}

.page-about .ab-team-net h3 {
  margin: 18px 0 10px;
  font-family: var(--font-head);
  font-weight: 600;
  font-stretch: 87.5%;
  font-size: 21px;
  color: #fff;
}

.page-about .ab-team-net p {
  font-size: 15px;
  line-height: 1.78;
  color: rgba(232, 238, 242, 0.82);
}

.page-about .ab-team-net p + p {
  margin-top: 12px;
}

.page-about .ab-team .figure {
  border: 1px solid rgba(127, 168, 191, 0.3);
}

/* ---------- 质量 ---------- */
.page-about .ab-quality-figure {
  margin-top: 30px;
}

.page-about .ab-table-caption {
  caption-side: top;
  text-align: left;
  padding-bottom: 12px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .ab-quality .table-wrap {
  margin-top: 30px;
}

.page-about .ab-quality-note {
  margin-top: 20px;
  padding-left: 14px;
  border-left: 3px solid var(--amber);
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
  max-width: 62ch;
}

/* ---------- 渠道 ---------- */
.page-about .ab-channel {
  background: linear-gradient(180deg, var(--grey) 0%, var(--paper) 100%);
}

.page-about .ab-channel-grid {
  display: grid;
  gap: 28px;
  margin-top: 32px;
}

.page-about .ab-channel-main p {
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text);
  max-width: 60ch;
}

.page-about .ab-channel-main p + p {
  margin-top: 14px;
}

.page-about .ab-channel-supports {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-channel-supports li {
  position: relative;
  padding: 16px 18px 16px 20px;
  background: #fff;
  border-left: 3px solid var(--teal);
  box-shadow: var(--shadow-card);
}

.page-about .ab-support-index {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--teal-deep);
}

.page-about .ab-channel-supports h3 {
  margin: 6px 0 6px;
  font-family: var(--font-head);
  font-weight: 600;
  font-stretch: 87.5%;
  font-size: 18px;
  color: var(--ink);
}

.page-about .ab-channel-supports p {
  font-size: 14px;
  line-height: 1.68;
  color: var(--muted);
}

/* ---------- 结尾行动 ---------- */
.page-about .ab-cta {
  padding: 52px 0 60px;
  background: linear-gradient(120deg, var(--ink) 0%, var(--blue) 100%);
  color: #fff;
}

.page-about .ab-cta-inner {
  display: grid;
  gap: 24px;
}

.page-about .ab-cta h2 {
  margin: 8px 0 12px;
  font-family: var(--font-head);
  font-weight: 700;
  font-stretch: 87.5%;
  font-size: clamp(23px, 5.6vw, 34px);
  line-height: 1.22;
  color: #fff;
}

.page-about .ab-cta p {
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.76;
  color: rgba(232, 238, 242, 0.82);
}

.page-about .ab-cta .eyebrow {
  color: var(--amber-soft);
}

.page-about .ab-cta-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.page-about .ab-cta-text {
  color: rgba(232, 238, 242, 0.86);
  font-size: 14px;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 图片容器 ---------- */
.page-about .figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-hero {
    padding: calc(var(--header-h) + 58px) 0 60px;
  }

  .page-about .ab-intro-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .ab-era-media {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: 26px;
  }

  .page-about .ab-svc-c {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: 26px;
  }

  .page-about .ab-channel-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .ab-cta-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
    gap: 34px;
  }

  .page-about .ab-cta-actions {
    justify-content: flex-end;
  }
}

@media (min-width: 980px) {
  .page-about .ab-hero-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.85fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .ab-service-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .ab-svc-a {
    grid-column: span 5;
  }

  .page-about .ab-svc-b {
    grid-column: span 7;
  }

  .page-about .ab-svc-c {
    grid-column: span 12;
  }

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

  .page-about .ab-era {
    margin-left: 14px;
  }

  .page-about .ab-era .acc-item {
    padding-left: 30px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-toc a,
  .page-about .ab-bar-fill,
  .page-about .ab-era .acc-icon::after {
    transition: none;
  }
}

.page-about {
  --pct: 1rem;
}