.page-about {
  --ab-hair: rgba(138, 150, 147, 0.34);
  --ab-ink-soft: rgba(10, 14, 12, 0.82);
  --ab-delay: 0ms;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink-900);
  color: var(--paper-050);
  padding: clamp(22px, 4vw, 40px) 0 clamp(36px, 6vw, 72px);
}

.page-about .ab-hero__slice {
  position: absolute;
  top: -32%;
  right: -14%;
  width: min(620px, 70vw);
  height: 172%;
  background: linear-gradient(155deg, var(--pitch-500) 0%, var(--pitch-700) 52%, rgba(6, 122, 69, 0) 78%);
  opacity: 0.3;
  transform: skewX(-12deg);
  pointer-events: none;
}

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

.page-about .ab-hero .breadcrumb {
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .ab-hero .breadcrumb__link {
  color: var(--tile-400);
}

.page-about .ab-hero .breadcrumb__link:hover,
.page-about .ab-hero .breadcrumb__link:focus-visible {
  color: var(--pitch-500);
}

.page-about .ab-hero .breadcrumb__current {
  color: var(--paper-050);
}

.page-about .ab-hero__title {
  margin: clamp(12px, 2vw, 20px) 0 0;
  max-width: 16em;
  font-family: var(--font-heading);
  font-size: clamp(2.1rem, 5.6vw, 3.6rem);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.page-about .ab-hero__lead {
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  max-width: 46em;
  font-size: clamp(1rem, 1.3vw, 1.125rem);
  line-height: 1.8;
  color: rgba(244, 247, 244, 0.82);
}

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 1px 0;
  background: rgba(244, 247, 244, 0.16);
  border-top: 1px solid rgba(244, 247, 244, 0.16);
}

.page-about .ab-stats__item {
  background: var(--ink-900);
  padding: 16px 12px 16px 0;
}

.page-about .ab-stats dt {
  margin-bottom: 10px;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--tile-400);
}

.page-about .ab-stats dd {
  margin: 0;
  font-family: var(--font-data);
  font-size: clamp(1.25rem, 2.4vw, 1.75rem);
  font-weight: 700;
  line-height: 1;
  color: var(--pitch-500);
}

/* ---------- 主体骨架 ---------- */
.page-about .ab-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
  padding-block: clamp(36px, 6vw, 76px) clamp(40px, 6vw, 88px);
}

.page-about .ab-rail {
  display: none;
}

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

/* ---------- 内容块 ---------- */
.page-about .ab-block + .ab-block {
  margin-top: clamp(40px, 6vw, 76px);
}

.page-about .ab-block + .ab-block:nth-child(n + 6) {
  margin-top: clamp(56px, 8.5vw, 112px);
}

.page-about .ab-block__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  padding-bottom: 14px;
  margin-bottom: clamp(20px, 3vw, 32px);
  border-bottom: 2px solid var(--ink-900);
}

.page-about .ab-block__idx {
  padding: 3px 8px;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  font-weight: 700;
  color: var(--pitch-700);
  background: var(--pitch-tint);
  clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px);
}

.page-about .ab-block__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 900;
  line-height: 1.24;
  letter-spacing: -0.02em;
  color: var(--ink-900);
}

.page-about .ab-block p {
  font-size: clamp(0.9375rem, 1.05vw, 1.0625rem);
  line-height: 1.8;
  color: var(--ab-ink-soft);
}

.page-about .ab-block__lead {
  margin: 0 0 18px;
  font-size: clamp(1rem, 1.15vw, 1.125rem) !important;
  color: var(--ink-900) !important;
}

.page-about .ab-block > p:not(.ab-block__lead) {
  margin: 0 0 16px;
}

/* ---------- 做 / 不做 ---------- */
.page-about .ab-bounds {
  list-style: none;
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ab-hair);
  border: 1px solid var(--ab-hair);
}

.page-about .ab-bounds li {
  padding: clamp(14px, 2vw, 22px);
  background: var(--paper-050);
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--ab-ink-soft);
}

.page-about .ab-bounds li strong {
  display: inline-block;
  margin-right: 8px;
  padding: 2px 8px;
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--paper-050);
  background: var(--pitch-700);
}

.page-about .ab-bounds li:last-child strong {
  background: var(--ink-900);
}

/* ---------- 沿革 ---------- */
.page-about .ab-stages {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
  display: grid;
  gap: clamp(24px, 3.4vw, 34px);
}

.page-about .ab-stages::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--pitch-500), var(--tech-600) 58%, var(--tile-400));
  opacity: 0.5;
}

.page-about .ab-stage {
  position: relative;
}

.page-about .ab-stage::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--paper-050);
  border: 2px solid var(--tile-400);
  transform: rotate(45deg);
}

.page-about .ab-stage.is-current::before {
  background: var(--pitch-500);
  border-color: var(--pitch-500);
}

.page-about .ab-stage__phase {
  margin: 0 0 4px;
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--tech-700);
}

.page-about .ab-stage.is-current .ab-stage__phase {
  color: var(--pitch-700);
}

.page-about .ab-stage__name {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: clamp(1.0625rem, 1.6vw, 1.25rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .ab-stage p:not(.ab-stage__phase) {
  margin: 0;
  font-size: 0.9375rem;
}

/* ---------- 口径表 ---------- */
.page-about .ab-spec {
  display: grid;
  gap: 1px;
  background: var(--ab-hair);
  border: 1px solid var(--ab-hair);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .ab-spec__cell {
  background: var(--paper-050);
  padding: clamp(16px, 2.4vw, 24px);
}

.page-about .ab-spec__term {
  margin: 0 0 10px !important;
  font-family: var(--font-data);
  font-size: 0.75rem !important;
  letter-spacing: 0.08em;
  color: var(--tech-700) !important;
}

.page-about .ab-spec__desc {
  margin: 0 !important;
  font-size: 0.9375rem !important;
  line-height: 1.78 !important;
}

/* ---------- 校核流程 ---------- */
.page-about .ab-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-step__panel {
  background: var(--paper-050);
  border: 1px solid var(--ab-hair);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.page-about .ab-step__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--ink-900);
}

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

.page-about .ab-step__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-data);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--tech-600);
}

.page-about .ab-step__panel[open] .ab-step__summary::after {
  content: "–";
  color: var(--pitch-700);
}

.page-about .ab-step__summary:focus-visible {
  outline: 2px solid var(--pitch-500);
  outline-offset: -2px;
}

.page-about .ab-step__num {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--paper-050);
  background: var(--ink-900);
  padding: 3px 7px;
  clip-path: polygon(5px 0, 100% 0, 100% calc(100% - 5px), calc(100% - 5px) 100%, 0 100%, 0 5px);
}

.page-about .ab-step__panel[open] .ab-step__num {
  background: var(--pitch-700);
}

.page-about .ab-step__text {
  margin: 0 !important;
  padding: 0 18px 18px;
  font-size: 0.9375rem !important;
  border-top: 1px dashed var(--ab-hair);
  padding-top: 14px;
}

/* ---------- 图片 ---------- */
.page-about .ab-figure {
  margin: clamp(22px, 3.4vw, 36px) 0 0;
}

.page-about .ab-figure .media__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about .ab-figure--region .media__img {
  aspect-ratio: 3 / 2;
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 28px);
  padding: clamp(20px, 3vw, 34px);
  background: var(--slate-800);
  color: var(--paper-050);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .ab-team__card {
  padding-top: 14px;
  border-top: 2px solid var(--pitch-500);
}

.page-about .ab-team__num {
  margin: 0;
  font-family: var(--font-data);
  font-size: clamp(1.9rem, 3.4vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  color: var(--pitch-500);
}

.page-about .ab-team__role {
  margin: 8px 0 8px;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper-050);
}

.page-about .ab-team__desc {
  margin: 0 !important;
  font-size: 0.875rem !important;
  line-height: 1.78 !important;
  color: rgba(244, 247, 244, 0.74) !important;
}

/* ---------- 地域 ---------- */
.page-about .ab-region {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  align-items: start;
}

.page-about .ab-region__text p {
  margin: 0 0 16px;
}

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

/* ---------- 合作 ---------- */
.page-about .ab-partners {
  list-style: none;
  margin: clamp(4px, 1vw, 10px) 0 20px;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--ab-hair);
  border: 1px solid var(--ab-hair);
}

.page-about .ab-partners li {
  background: var(--paper-050);
  padding: clamp(16px, 2.2vw, 22px);
}

.page-about .ab-partners__num {
  margin: 0 0 8px !important;
  font-family: var(--font-data);
  font-size: clamp(1.1rem, 1.8vw, 1.375rem) !important;
  font-weight: 700;
  color: var(--tech-700) !important;
}

.page-about .ab-partners__desc {
  margin: 0 !important;
  font-size: 0.9375rem !important;
  line-height: 1.78 !important;
}

/* ---------- 联系 ---------- */
.page-about .ab-contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(18px, 2.6vw, 26px);
}

.page-about .ab-contact__card {
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--tech-tint);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .ab-contact__label {
  margin: 0 0 8px !important;
  font-family: var(--font-data);
  font-size: 0.75rem !important;
  letter-spacing: 0.08em;
  color: var(--tech-700) !important;
}

.page-about .ab-contact__value {
  margin: 0 0 14px !important;
  font-family: var(--font-data);
  font-size: clamp(1rem, 1.5vw, 1.1875rem) !important;
  font-weight: 700;
  color: var(--ink-900) !important;
  overflow-wrap: anywhere;
}

.page-about .ab-contact__note {
  margin: 14px 0 0 !important;
  font-size: 0.875rem !important;
  line-height: 1.75 !important;
  color: var(--ab-ink-soft) !important;
}

.page-about .ab-next {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(28px, 4vw, 44px);
  padding-top: 20px;
  border-top: 2px solid var(--ink-900);
}

/* ---------- 滚动显现 ---------- */
.page-about [data-reveal][data-reveal-delay="70"] {
  --ab-delay: 70ms;
}

.page-about [data-reveal][data-reveal-delay="140"] {
  --ab-delay: 140ms;
}

@media (prefers-reduced-motion: no-preference) {
  .page-about [data-reveal] {
    opacity: 0;
    transform: translate3d(0, 18px, 0);
    transition: opacity 460ms var(--ease) var(--ab-delay),
      transform 460ms var(--ease) var(--ab-delay);
  }

  .page-about [data-reveal].is-visible {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .ab-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 720px) {
  .page-about .ab-spec {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 860px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-stats__item {
    padding: 20px 18px 20px 0;
  }

  .page-about .ab-stats__item + .ab-stats__item {
    padding-left: 18px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-region {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  }

  .page-about .ab-region .ab-figure {
    margin-top: 4px;
  }
}

@media (min-width: 1000px) {
  .page-about .ab-body {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
  }

  .page-about .ab-rail {
    display: block;
    position: sticky;
    top: clamp(96px, 12vh, 144px);
    align-self: start;
  }

  .page-about .ab-rail__track {
    position: relative;
    display: grid;
    gap: 26px;
  }

  .page-about .ab-rail__track::before {
    content: "";
    position: absolute;
    left: 3px;
    top: 6px;
    bottom: 6px;
    width: 1px;
    background: linear-gradient(180deg, var(--pitch-500), var(--tech-600) 60%, var(--tile-400));
    opacity: 0.5;
  }

  .page-about .ab-rail__node {
    position: relative;
    padding-left: 20px;
    font-family: var(--font-data);
    font-size: 0.6875rem;
    letter-spacing: 0.1em;
    color: var(--tile-400);
  }

  .page-about .ab-rail__node::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.32em;
    width: 7px;
    height: 7px;
    background: var(--pitch-500);
    clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
  }
}

@media (min-width: 1100px) {
  .page-about .ab-spec {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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