.page-about {
  --ab-gap: clamp(20px, 4vw, 48px);
  --ab-pad: clamp(44px, 6vw, 96px);
  --ab-line-dark: rgba(36, 64, 90, 0.62);
  --ab-line-light: rgba(36, 64, 90, 0.16);
  --ab-amber-glow: rgba(242, 184, 75, 0.10);
  background: var(--ink-900);
  color: var(--paper);
  overflow-x: clip;
}

.page-about .mono {
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

/* ---------- 首屏品牌声明 ---------- */
.page-about .ab-hero {
  position: relative;
  padding-block: clamp(24px, 4vw, 48px) clamp(28px, 4vw, 56px);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 90% at 8% 0%, var(--ab-amber-glow), transparent 62%),
    radial-gradient(80% 70% at 100% 10%, rgba(57, 208, 176, 0.06), transparent 70%);
  pointer-events: none;
}

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

.page-about .breadcrumb {
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-hero__title {
  margin: 0 0 20px;
  font-size: clamp(32px, 7vw, 72px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ab-hero__lede {
  max-width: 46ch;
  color: var(--paper-dim);
  font-size: var(--fs-16);
  line-height: 1.9;
}

.page-about .ab-hero__aside {
  border-left: 1px solid var(--line);
  padding-left: 18px;
}

.page-about .ab-aside__label {
  margin: 0 0 16px;
  font-size: var(--fs-12);
  color: var(--mist);
  text-transform: uppercase;
}

.page-about .ab-facts {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-facts__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-facts__row dt {
  font-size: var(--fs-14);
  color: var(--mist);
}

.page-about .ab-facts__row dd {
  margin: 0;
  font-size: var(--fs-14);
  color: var(--amber);
}

/* ---------- 图片容器 ---------- */
.page-about .ab-figure {
  margin: 0;
}

.page-about .ab-figure__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--ink-800);
}

.page-about .ab-figure__cap {
  display: block;
  margin-top: 12px;
  font-size: var(--fs-12);
  color: var(--mist);
}

.page-about .ab-visual {
  padding-block: 0 clamp(40px, 6vw, 80px);
}

/* ---------- 通用小标题组 ---------- */
.page-about .ab-head {
  margin-bottom: clamp(26px, 4vw, 44px);
  max-width: 62ch;
}

.page-about .ab-head__title {
  margin: 10px 0 14px;
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.01em;
}

.page-about .ab-head__text {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.85;
}

.page-about .ab-head--dark .ab-head__title { color: var(--paper); }
.page-about .ab-head--dark .ab-head__text { color: var(--mist); }

/* ---------- 四个动作 ---------- */
.page-about .ab-actions {
  padding-block: 0 clamp(48px, 7vw, 96px);
}

.page-about .ab-actionlist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--ab-line-dark);
}

.page-about .ab-action {
  position: relative;
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  grid-template-areas:
    "no title"
    "no text";
  gap: 6px 16px;
  padding: 22px 0 24px;
  border-bottom: 1px solid var(--ab-line-dark);
}

.page-about .ab-action::before {
  content: "";
  position: absolute;
  left: 0;
  top: -1px;
  width: 0;
  height: 1px;
  background: var(--amber);
  transition: width 240ms var(--ease);
}

.page-about .ab-action:hover::before,
.page-about .ab-action:focus-within::before {
  width: 100%;
}

.page-about .ab-action__no {
  grid-area: no;
  font-size: var(--fs-12);
  color: var(--amber);
  padding-top: 4px;
}

.page-about .ab-action__title {
  grid-area: title;
  margin: 0;
  font-size: var(--fs-20);
  font-weight: 800;
  color: var(--paper);
}

.page-about .ab-action__text {
  grid-area: text;
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 服务范围（冷白内容带） ---------- */
.page-about .ab-scope {
  background: var(--paper);
  color: var(--ink-900);
  padding-block: var(--ab-pad);
}

.page-about .ab-scope .eyebrow {
  color: var(--hit-deep);
}

.page-about .ab-scope__grid {
  display: grid;
  gap: clamp(32px, 5vw, 56px);
}

.page-about .ab-scope__title {
  margin: 10px 0 14px;
  font-size: clamp(26px, 4.4vw, 40px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .ab-scope__lede {
  margin: 0 0 clamp(24px, 3vw, 34px);
  max-width: 56ch;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: #3B5166;
}

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

.page-about .ab-cap__row {
  position: relative;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 8px 14px;
  padding: 20px 0 22px 14px;
  border-bottom: 1px solid var(--ab-line-light);
}

.page-about .ab-cap__row::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  bottom: 22px;
  width: 2px;
  background: var(--amber);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 220ms var(--ease);
}

.page-about .ab-cap__row:hover::before {
  transform: scaleY(1);
}

.page-about .ab-cap__no {
  font-size: var(--fs-12);
  color: var(--hit-deep);
  padding-top: 3px;
}

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

.page-about .ab-cap__title {
  margin: 0 0 6px;
  font-size: var(--fs-20);
  font-weight: 800;
  color: var(--ink-900);
}

.page-about .ab-cap__text {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: #3B5166;
}

.page-about .ab-cap__tag {
  grid-column: 2;
  justify-self: start;
  margin-top: 4px;
  padding: 3px 9px;
  font-size: var(--fs-12);
  color: var(--ink-900);
  background: rgba(242, 184, 75, 0.22);
  border: 1px solid rgba(242, 184, 75, 0.55);
  border-radius: 999px;
  white-space: nowrap;
}

.page-about .ab-scope__aside {
  display: grid;
  gap: 24px;
  align-content: start;
}

.page-about .ab-scope__note {
  background: var(--ink-900);
  color: var(--paper);
  border-radius: var(--radius-md);
  padding: 22px 22px 24px;
}

.page-about .ab-scope__note-title {
  margin: 0 0 10px;
  font-size: var(--fs-20);
  font-weight: 800;
  color: var(--amber-soft);
}

.page-about .ab-scope__note p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--paper-dim);
}

/* ---------- 时间线 ---------- */
.page-about .ab-timeline-sec {
  padding-block: var(--ab-pad);
  background:
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-850) 60%, var(--ink-900) 100%);
}

.page-about .ab-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 28px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--amber) 0%, var(--line) 22%, var(--line) 82%, transparent 100%);
}

.page-about .ab-tl {
  position: relative;
  padding-bottom: 6px;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 16px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--amber);
  box-shadow: 0 0 0 4px rgba(242, 184, 75, 0.09);
  transition: background 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-about .ab-tl:hover::before {
  background: var(--amber);
  box-shadow: 0 0 0 5px rgba(242, 184, 75, 0.16);
}

.page-about .ab-tl__d {
  border-bottom: 1px solid var(--ab-line-dark);
}

.page-about .ab-tl__d[open] {
  border-bottom-color: var(--line);
}

.page-about .ab-tl__sum {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr) 18px;
  align-items: center;
  gap: 14px;
  padding: 20px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-tl__sum:hover .ab-tl__name { color: var(--amber-soft); }

.page-about .ab-tl__year {
  font-size: var(--fs-14);
  color: var(--amber);
}

.page-about .ab-tl__name {
  font-size: var(--fs-16);
  font-weight: 700;
  color: var(--paper);
  transition: color 180ms var(--ease);
}

.page-about .ab-tl__chev {
  width: 9px;
  height: 9px;
  border-right: 1px solid var(--mist);
  border-bottom: 1px solid var(--mist);
  transform: rotate(45deg);
  transition: transform 200ms var(--ease), border-color 200ms var(--ease);
  justify-self: end;
  align-self: center;
  margin-top: -3px;
}

.page-about .ab-tl__d[open] .ab-tl__chev {
  transform: rotate(-135deg);
  border-color: var(--hit);
  margin-top: 3px;
}

.page-about .ab-tl__body {
  padding: 0 0 22px;
}

.page-about .ab-tl__body p {
  margin: 0;
  max-width: 68ch;
  font-size: var(--fs-14);
  line-height: 1.9;
  color: var(--mist);
  border-left: 1px solid var(--hit-deep);
  padding-left: 14px;
}

/* ---------- 团队与运营 ---------- */
.page-about .ab-team {
  padding-block: clamp(40px, 6vw, 88px);
  background: var(--ink-800);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-team__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .ab-team__title {
  margin: 10px 0 14px;
  font-size: clamp(25px, 4vw, 36px);
  font-weight: 800;
  line-height: 1.2;
  color: var(--paper);
}

.page-about .ab-team__lede {
  margin: 0 0 clamp(22px, 3vw, 30px);
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .ab-roles {
  margin: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--ab-line-dark);
}

.page-about .ab-roles__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 0 18px;
  border-bottom: 1px solid var(--ab-line-dark);
}

.page-about .ab-roles__row dt {
  font-size: var(--fs-16);
  font-weight: 700;
  color: var(--amber-soft);
}

.page-about .ab-roles__row dd {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 数据带 ---------- */
.page-about .ab-numbers {
  padding-block: var(--ab-pad);
  background:
    radial-gradient(90% 60% at 80% 0%, rgba(242, 184, 75, 0.09), transparent 65%),
    var(--ink-900);
}

.page-about .ab-numbers__head {
  max-width: 56ch;
  margin-bottom: clamp(30px, 4vw, 48px);
}

.page-about .ab-numbers__title {
  margin: 10px 0 0;
  font-size: clamp(24px, 3.6vw, 34px);
  font-weight: 800;
  line-height: 1.25;
  color: var(--paper);
}

.page-about .ab-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1px;
  background: var(--ab-line-dark);
  border: 1px solid var(--ab-line-dark);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 26px 20px 28px;
  background: var(--ink-850);
}

.page-about .ab-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.4vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
  letter-spacing: -0.02em;
}

.page-about .ab-stat__unit {
  font-size: var(--fs-14);
  margin-left: 3px;
  color: var(--amber-soft);
}

.page-about .ab-stat__label {
  font-size: var(--fs-14);
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-stat__note {
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 下一步 ---------- */
.page-about .ab-next {
  padding-block: clamp(44px, 6vw, 88px);
  background: var(--paper);
  color: var(--ink-900);
}

.page-about .ab-next .eyebrow {
  color: var(--hit-deep);
}

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

.page-about .ab-next__title {
  margin: 10px 0 14px;
  font-size: clamp(25px, 4vw, 36px);
  font-weight: 800;
  line-height: 1.2;
  color: var(--ink-900);
}

.page-about .ab-next__text {
  margin: 0;
  max-width: 42ch;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: #3B5166;
}

.page-about .ab-next__links {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .ab-jump {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) 20px;
  align-items: center;
  gap: 14px;
  padding: 18px 18px 18px 16px;
  text-decoration: none;
  color: var(--paper);
  background: var(--ink-900);
  border: 1px solid var(--ink-900);
  border-radius: var(--radius-md);
  transition: transform 200ms var(--ease), border-color 200ms var(--ease), background 200ms var(--ease);
}

.page-about .ab-jump:hover,
.page-about .ab-jump:focus-visible {
  transform: translateX(4px);
  border-color: var(--amber);
}

.page-about .ab-jump--quiet {
  background: transparent;
  border-color: rgba(36, 64, 90, 0.28);
  color: var(--ink-900);
}

.page-about .ab-jump--quiet:hover,
.page-about .ab-jump--quiet:focus-visible {
  background: #FFFFFF;
  border-color: var(--hit-deep);
}

.page-about .ab-jump__no {
  font-size: var(--fs-12);
  color: var(--amber);
}

.page-about .ab-jump--quiet .ab-jump__no {
  color: var(--hit-deep);
}

.page-about .ab-jump__body {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .ab-jump__title {
  font-size: var(--fs-16);
  font-weight: 700;
}

.page-about .ab-jump__text {
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--mist);
}

.page-about .ab-jump--quiet .ab-jump__text {
  color: #3B5166;
}

.page-about .ab-jump__arrow {
  justify-self: end;
  font-size: var(--fs-16);
  color: var(--amber);
  transition: transform 200ms var(--ease);
}

.page-about .ab-jump--quiet .ab-jump__arrow {
  color: var(--hit-deep);
}

.page-about .ab-jump:hover .ab-jump__arrow {
  transform: translateX(4px);
}

/* ---------- 中等屏幕 ---------- */
@media (min-width: 720px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .ab-hero__aside {
    max-width: 460px;
  }

  .page-about .ab-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 26px;
  }

  .page-about .ab-actionlist {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 40px;
  }

  .page-about .ab-action {
    padding-block: 24px 26px;
  }

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

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

/* ---------- 桌面端：非对称编辑部版式 ---------- */
@media (min-width: 1000px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(230px, 0.62fr);
    align-items: start;
    column-gap: clamp(32px, 5vw, 72px);
  }

  .page-about .ab-hero__title {
    max-width: 16ch;
  }

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

  .page-about .ab-head {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    column-gap: clamp(28px, 4vw, 64px);
    align-items: end;
    max-width: none;
  }

  .page-about .ab-head .eyebrow {
    grid-column: 1 / -1;
    margin-bottom: 4px;
  }

  .page-about .ab-head__title {
    margin-top: 0;
    max-width: 18ch;
  }

  .page-about .ab-head__text {
    padding-bottom: 6px;
  }

  .page-about .ab-scope__grid {
    grid-template-columns: minmax(0, 1.85fr) minmax(260px, 0.85fr);
    column-gap: clamp(32px, 4vw, 64px);
  }

  .page-about .ab-cap__row {
    grid-template-columns: 44px minmax(0, 1fr) 132px;
    align-items: start;
    column-gap: 20px;
    padding-left: 16px;
  }

  .page-about .ab-cap__tag {
    grid-column: 3;
    justify-self: end;
    margin-top: 6px;
  }

  .page-about .ab-tl__sum {
    grid-template-columns: 76px minmax(0, 1fr) 24px;
    padding: 24px 0;
  }

  .page-about .ab-tl__name {
    font-size: var(--fs-20);
  }

  .page-about .ab-tl__body {
    padding-left: 90px;
  }

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

  .page-about .ab-roles__row {
    grid-template-columns: 132px minmax(0, 1fr);
    column-gap: 22px;
    align-items: baseline;
  }

  .page-about .ab-stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .ab-next__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.35fr);
    column-gap: clamp(32px, 5vw, 80px);
    align-items: start;
  }

  .page-about .ab-scope__aside {
    padding-top: 10px;
  }
}

@media (min-width: 1280px) {
  .page-about .ab-hero__title {
    font-size: 68px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-action::before,
  .page-about .ab-cap__row::before,
  .page-about .ab-jump,
  .page-about .ab-jump__arrow,
  .page-about .ab-tl__chev {
    transition: none;
  }
}