.page-about {
  --ab-ink-text: #22333F;
  --ab-hairline: rgba(6, 19, 31, 0.14);
  --ab-hairline-light: rgba(143, 168, 186, 0.22);
  background: var(--ink-900);
  color: var(--cream-light);
  overflow-x: hidden;
}

.page-about a {
  color: inherit;
}

/* ===== 面包屑 ===== */
.page-about .breadcrumb {
  background: var(--ink-900);
  padding: 18px 0 6px;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--steel-blue);
}

.page-about .breadcrumb__item {
  display: inline-flex;
  align-items: center;
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-blue);
}

.page-about .breadcrumb__item a {
  color: var(--steel-blue);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .breadcrumb__item a:hover,
.page-about .breadcrumb__item a:focus-visible {
  color: var(--neon-cyan);
}

.page-about .breadcrumb__item[aria-current="page"] {
  color: var(--cream-light);
}

/* ===== 通用小标签 ===== */
.page-about .ab-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--electric-orange);
}

.page-about .ab-eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: currentColor;
}

/* ===== 通用衬线标题 ===== */
.page-about .ab-serif-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(26px, 4.6vw, 42px);
  line-height: 1.26;
  letter-spacing: -0.01em;
  margin: 0 0 22px;
  color: var(--ab-ink-text);
}

.page-about .ab-serif-title--light {
  color: var(--cream-light);
}

/* ===== 首屏 ===== */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 56px) 0 clamp(44px, 6vw, 84px);
  background:
    radial-gradient(120% 90% at 92% 0%, rgba(61, 245, 212, 0.13), transparent 58%),
    radial-gradient(90% 80% at 2% 100%, rgba(255, 107, 44, 0.1), transparent 62%),
    var(--ink-900);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(180deg, rgba(251, 244, 228, 0.035) 0 1px, transparent 1px 4px);
  opacity: 0.6;
}

.page-about .ab-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 56px);
}

.page-about .ab-hero__title {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(34px, 7.4vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--cream-light);
  text-wrap: balance;
}

.page-about .ab-hero__lede {
  margin: 20px 0 0;
  max-width: 48ch;
  font-size: clamp(15px, 2.1vw, 17px);
  line-height: 1.85;
  color: var(--steel-blue);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .ab-hero__metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(30px, 4.5vw, 44px) 0 0;
  background: var(--line-blue);
  border: 1px solid var(--line-blue);
  clip-path: var(--cut-sm);
}

.page-about .ab-metric {
  margin: 0;
  padding: 16px 12px 18px;
  background: var(--ink-800);
}

.page-about .ab-metric__num {
  display: block;
  margin: 0;
  font-family: var(--font-num);
  font-weight: 800;
  font-size: clamp(21px, 4.2vw, 34px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--neon-cyan);
}

.page-about .ab-metric__label {
  display: block;
  margin-top: 9px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--steel-blue);
}

.page-about .ab-hero__figure {
  margin: 0;
}

.page-about .ab-hero__figure .media {
  aspect-ratio: 14 / 9;
  overflow: hidden;
  background: var(--ink-800);
  clip-path: var(--cut-md);
  border-bottom: 2px solid var(--electric-orange);
}

.page-about .ab-hero__figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
}

.page-about .ab-hero__caption {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--steel-blue);
}

/* ===== 页内目录 ===== */
.page-about .ab-index {
  background: var(--ink-800);
  border-top: 1px solid var(--line-blue);
  border-bottom: 1px solid var(--line-blue);
}

.page-about .ab-index__list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 14px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-about .ab-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 15px;
  border: 1px solid var(--line-blue);
  border-radius: 999px;
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  color: var(--cream-light);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .ab-index__link:hover,
.page-about .ab-index__link:focus-visible {
  border-color: var(--neon-cyan);
  color: var(--neon-cyan);
  background: rgba(61, 245, 212, 0.07);
}

.page-about .ab-index__num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 12px;
  color: var(--electric-orange);
}

/* ===== 锚点偏移 ===== */
.page-about section[id] {
  scroll-margin-top: calc(var(--header-h) + 16px);
}

/* ===== 起点章节（纸色） ===== */
.page-about .ab-origin {
  background: var(--paper-cream);
  color: var(--ab-ink-text);
  padding: clamp(48px, 7vw, 100px) 0 clamp(42px, 6vw, 88px);
}

.page-about .ab-origin__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 40px);
}

.page-about .ab-origin__mark {
  font-family: var(--font-num);
  font-weight: 800;
  font-size: clamp(68px, 15vw, 128px);
  line-height: 0.8;
  letter-spacing: -0.05em;
  color: transparent;
  -webkit-text-stroke: 2px rgba(6, 19, 31, 0.26);
}

.page-about .ab-origin__body {
  max-width: 62ch;
}

.page-about .ab-body p {
  margin: 0 0 1.05em;
  font-size: clamp(15px, 2vw, 17px);
  line-height: 1.9;
  color: var(--ab-ink-text);
}

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

.page-about .ab-pull {
  margin: 30px 0 0;
  padding: 4px 0 4px 20px;
  border-left: 3px solid var(--electric-orange);
  font-family: var(--font-serif);
  font-size: clamp(18px, 2.9vw, 24px);
  line-height: 1.62;
  color: var(--ink-900);
}

/* ===== 方法章节（深色） ===== */
.page-about .ab-method {
  padding: clamp(48px, 7vw, 100px) 0;
  background:
    linear-gradient(180deg, rgba(12, 34, 51, 0.7), transparent 42%),
    var(--ink-900);
}

.page-about .ab-method__head {
  max-width: 66ch;
  margin-bottom: clamp(30px, 5vw, 56px);
}

.page-about .ab-method__intro {
  margin: 0;
  font-size: clamp(15px, 2vw, 17px);
  line-height: 1.85;
  color: var(--steel-blue);
}

.page-about .ab-method__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
}

.page-about .ab-method__figure {
  margin: 0;
}

.page-about .ab-method__figure .media {
  aspect-ratio: 5 / 6;
  overflow: hidden;
  background: var(--ink-800);
  clip-path: var(--cut-md);
  border-left: 2px solid var(--neon-cyan);
}

.page-about .ab-method__figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.05);
}

.page-about .ab-method__caption {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--steel-blue);
}

/* 标签页（沿用共享 tabs 结构，页面内调整外观） */
.page-about .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0 0 16px;
  border-bottom: 1px solid var(--line-blue);
}

.page-about .tabs__tab {
  appearance: none;
  padding: 9px 17px;
  border: 1px solid var(--line-blue);
  border-radius: 999px;
  background: transparent;
  color: var(--steel-blue);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.4;
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .tabs__tab:hover {
  border-color: var(--neon-cyan);
  color: var(--neon-cyan);
}

.page-about .tabs__tab[aria-selected="true"] {
  background: var(--neon-cyan);
  border-color: var(--neon-cyan);
  color: var(--ink-900);
  font-weight: 700;
}

.page-about .tabs__tab:focus-visible {
  outline: 2px solid var(--neon-cyan);
  outline-offset: 3px;
}

.page-about .tabs__panel {
  padding-top: 26px;
}

.page-about .ab-panel__title {
  margin: 0 0 14px;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(20px, 3.2vw, 26px);
  line-height: 1.35;
  color: var(--cream-light);
}

.page-about .ab-panel__text {
  margin: 0 0 18px;
  font-size: clamp(15px, 2vw, 16.5px);
  line-height: 1.85;
  color: var(--steel-blue);
}

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

.page-about .ab-panel__list li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--cream-light);
}

.page-about .ab-panel__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--turf-green);
}

/* ===== 团队章节（纸色） ===== */
.page-about .ab-team {
  background: var(--paper-cream);
  color: var(--ab-ink-text);
  padding: clamp(48px, 7vw, 100px) 0;
}

.page-about .ab-team__head {
  max-width: 68ch;
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-about .ab-team__lede {
  margin: 0;
  font-size: clamp(15px, 2vw, 17px);
  line-height: 1.9;
}

.page-about .ab-team__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ab-hairline);
  border: 1px solid var(--ab-hairline);
  margin-bottom: clamp(30px, 4.5vw, 48px);
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px 20px;
  background: var(--paper-cream);
}

.page-about .ab-stat__num {
  font-family: var(--font-num);
  font-weight: 800;
  font-size: clamp(26px, 5vw, 38px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink-900);
}

.page-about .ab-stat__label {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(6, 19, 31, 0.66);
}

.page-about .ab-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ab-hairline);
}

.page-about .ab-step {
  position: relative;
  padding: 24px 0 26px 0;
  border-bottom: 1px solid var(--ab-hairline);
}

.page-about .ab-step__num {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--track-red);
  margin-bottom: 10px;
}

.page-about .ab-step__title {
  margin: 0 0 10px;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(17px, 2.4vw, 20px);
  line-height: 1.4;
  color: var(--ink-900);
}

.page-about .ab-step__text {
  margin: 0;
  max-width: 40ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ab-ink-text);
}

.page-about .ab-team__note {
  margin: clamp(24px, 3.5vw, 34px) 0 0;
  padding-left: 18px;
  border-left: 3px solid var(--turf-green);
  font-family: var(--font-serif);
  font-size: clamp(15px, 2vw, 17px);
  line-height: 1.8;
  color: var(--ink-900);
}

/* ===== 合作生态（深色） ===== */
.page-about .ab-partners {
  padding: clamp(48px, 7vw, 100px) 0;
  background:
    radial-gradient(90% 80% at 100% 0%, rgba(255, 107, 44, 0.12), transparent 60%),
    var(--ink-900);
}

.page-about .ab-partners__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 56px);
}

.page-about .ab-partners__lede {
  max-width: 56ch;
  margin: 0 0 26px;
  font-size: clamp(15px, 2vw, 17px);
  line-height: 1.85;
  color: var(--steel-blue);
}

.page-about .ab-collab {
  margin: 0 0 30px;
  border-top: 1px solid var(--ab-hairline-light);
}

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

.page-about .ab-collab dt {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 16px;
  letter-spacing: 0.02em;
  color: var(--neon-cyan);
}

.page-about .ab-collab dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--cream-light);
}

.page-about .ab-partners__figure {
  margin: 0;
}

.page-about .ab-partners__figure .media {
  aspect-ratio: 3 / 2;
  overflow: hidden;
  background: var(--ink-800);
  clip-path: var(--cut-md);
  border-top: 2px solid var(--electric-orange);
}

.page-about .ab-partners__figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
}

.page-about .ab-partners__caption {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--steel-blue);
}

/* ===== 发展阶段（纸色 + 时间轴） ===== */
.page-about .ab-stages {
  background: var(--paper-cream);
  color: var(--ab-ink-text);
  padding: clamp(48px, 7vw, 100px) 0;
}

.page-about .ab-stages__head {
  max-width: 64ch;
  margin-bottom: clamp(26px, 4vw, 40px);
}

.page-about .ab-stages__intro {
  margin: 0;
  font-size: clamp(15px, 2vw, 17px);
  line-height: 1.9;
}

.page-about .ab-track {
  position: relative;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(230px, 1fr);
  gap: 22px;
  margin: 0;
  padding: 34px 4px 10px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-track::before {
  content: "";
  position: absolute;
  left: 4px;
  right: 4px;
  top: 12px;
  height: 2px;
  background: repeating-linear-gradient(90deg, rgba(6, 19, 31, 0.42) 0 14px, transparent 14px 26px);
}

.page-about .ab-track__step {
  position: relative;
  padding-top: 6px;
}

.page-about .ab-track__dot {
  position: absolute;
  top: -30px;
  left: 0;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--electric-orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 44, 0.18);
}

.page-about .ab-track__label {
  display: block;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 17px;
  line-height: 1.4;
  color: var(--ink-900);
  margin-bottom: 10px;
}

.page-about .ab-track__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ab-ink-text);
}

/* ===== 结尾行动区 ===== */
.page-about .ab-cta {
  position: relative;
  padding: clamp(44px, 6vw, 84px) 0 clamp(52px, 7vw, 96px);
  background:
    radial-gradient(80% 120% at 0% 0%, rgba(61, 245, 212, 0.14), transparent 62%),
    var(--ink-800);
  border-top: 2px solid transparent;
  border-image: linear-gradient(90deg, var(--neon-cyan), var(--electric-orange)) 1;
}

.page-about .ab-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
  align-items: end;
}

.page-about .ab-cta__title {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(24px, 4vw, 36px);
  line-height: 1.3;
  color: var(--cream-light);
}

.page-about .ab-cta__lede {
  margin: 0;
  max-width: 52ch;
  font-size: clamp(15px, 2vw, 17px);
  line-height: 1.85;
  color: var(--steel-blue);
}

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

/* ===== 中等屏幕 ===== */
@media (min-width: 700px) {
  .page-about .ab-team__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-collab__row {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

/* ===== 桌面栅格 ===== */
@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: clamp(36px, 4vw, 72px);
  }

  .page-about .ab-origin__grid {
    grid-template-columns: 170px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 72px);
  }

  .page-about .ab-origin__mark {
    position: sticky;
    top: calc(var(--header-h) + 32px);
  }

  .page-about .ab-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    border-bottom: 1px solid var(--ab-hairline);
  }

  .page-about .ab-step {
    padding: 26px 28px 30px 0;
    border-bottom: 0;
    border-right: 1px solid var(--ab-hairline);
  }

  .page-about .ab-step:last-child {
    border-right: 0;
    padding-right: 0;
  }

  .page-about .ab-step + .ab-step {
    padding-left: 28px;
  }

  .page-about .ab-partners__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: clamp(36px, 4.5vw, 72px);
  }

  .page-about .ab-cta__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (min-width: 1000px) {
  .page-about .ab-method__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: start;
    gap: clamp(36px, 4.5vw, 72px);
  }
}

/* ===== 降低动效偏好 ===== */
@media (prefers-reduced-motion: reduce) {
  .page-about .ab-index__link,
  .page-about .tabs__tab,
  .page-about .breadcrumb__item a {
    transition: none;
  }
}