.page-about {
  background: var(--c-cream);
  color: var(--c-ink);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--c-slate);
  margin-bottom: var(--s2);
}
.page-about .breadcrumbs__item {
  color: var(--c-slate);
  text-decoration: none;
}
.page-about .breadcrumbs__item[aria-current="page"] {
  color: var(--c-ink);
}
.page-about .breadcrumbs__sep {
  color: var(--c-mist);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding: var(--s2) 0 var(--s4);
}
.page-about .ab-hero__frame {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--c-blue-deep);
  color: var(--c-cream);
  padding: clamp(34px, 6vw, 78px) clamp(22px, 5vw, 72px) clamp(36px, 5vw, 64px);
}
.page-about .ab-hero__frame::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 9px;
  z-index: 2;
  background-image: repeating-linear-gradient(90deg, rgba(246, 243, 236, .42) 0 1px, transparent 1px 22px);
}
.page-about .ab-hero__frame::after {
  content: "";
  position: absolute;
  right: -14%;
  top: -30%;
  width: 46%;
  height: 170%;
  z-index: 0;
  transform: rotate(-5deg);
  pointer-events: none;
  background: repeating-linear-gradient(45deg, rgba(255, 106, 26, .2) 0 7px, transparent 7px 18px);
}
.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
}
.page-about .ab-corner {
  position: absolute;
  z-index: 2;
  width: 14px;
  height: 14px;
  border: 1px solid rgba(246, 243, 236, .5);
}
.page-about .ab-corner--tl { top: 20px; left: 20px; border-right: 0; border-bottom: 0; }
.page-about .ab-corner--tr { top: 20px; right: 20px; border-left: 0; border-bottom: 0; }
.page-about .ab-corner--bl { bottom: 20px; left: 20px; border-right: 0; border-top: 0; }
.page-about .ab-corner--br { bottom: 20px; right: 20px; border-left: 0; border-top: 0; }

.page-about .ab-hero__index {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 22px;
  font-size: 12px;
  letter-spacing: .24em;
  color: var(--c-lime);
}
.page-about .ab-hero__index::before {
  content: "";
  width: 30px;
  height: 1px;
  background: var(--c-lime);
}
.page-about .ab-hero__title {
  margin: 0 0 clamp(18px, 3vw, 30px);
  max-width: 16em;
  font-size: clamp(32px, 6.4vw, 74px);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--c-cream);
}
.page-about .ab-hero__lede {
  margin: 0;
  max-width: 40em;
  font-size: 17px;
  line-height: 1.8;
  color: rgba(246, 243, 236, .82);
}
.page-about .ab-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 28px 44px;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid rgba(246, 243, 236, .18);
}
.page-about .ab-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.page-about .ab-hero__num {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-orange);
}
.page-about .ab-hero__lab {
  font-size: 12px;
  letter-spacing: .2em;
  color: rgba(246, 243, 236, .7);
}

/* ---------- 纵向时间轴 ---------- */
.page-about .ab-rail {
  padding: var(--s3) 0 var(--s4);
}
.page-about .ab-node {
  position: relative;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  column-gap: 18px;
  padding-bottom: var(--s4);
}
.page-about .ab-node:last-child {
  padding-bottom: 0;
}
.page-about .ab-node__marker {
  position: relative;
  display: flex;
  justify-content: center;
  padding-top: 6px;
}
.page-about .ab-node__marker::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: calc(-1 * var(--s4));
  left: 50%;
  width: 1px;
  transform: translateX(-50%);
  background: var(--c-mist);
}
.page-about .ab-node:last-child .ab-node__marker::before {
  bottom: auto;
  height: 26px;
}
.page-about .ab-node__num {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  background: var(--c-terra);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
}
.page-about .ab-node__kicker {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .24em;
  color: var(--c-terra);
}
.page-about .ab-node__title {
  margin: 0 0 16px;
  max-width: 20em;
  font-size: clamp(24px, 3.4vw, 38px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--c-blue);
}
.page-about .ab-node__text {
  margin: 0 0 16px;
  max-width: 42em;
  font-size: 17px;
  line-height: 1.8;
  color: var(--c-ink);
}
.page-about .ab-node__text:last-child {
  margin-bottom: 0;
}
.page-about .ab-node__text--tight {
  max-width: 46em;
}
.page-about .ab-link {
  color: var(--c-blue);
  text-decoration: none;
  border-bottom: 1px solid var(--c-orange);
  padding-bottom: 1px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .ab-link:hover,
.page-about .ab-link:focus-visible {
  color: var(--c-orange);
  border-bottom-color: var(--c-blue);
}
.page-about .ab-link:focus-visible {
  outline: 2px solid var(--c-orange);
  outline-offset: 2px;
}

/* ---------- 通栏图片 ---------- */
.page-about .ab-media {
  margin: var(--s2) 0 0;
}
.page-about .ab-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.78) contrast(1.06);
}
.page-about .ab-media--wide img {
  aspect-ratio: 8 / 3;
}

/* ---------- 团队角色 ---------- */
.page-about .ab-roles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: var(--s2);
  background: var(--c-mist);
  border: 1px solid var(--c-mist);
}
.page-about .ab-role {
  background: var(--c-cream);
  padding: 28px 24px 30px;
  border-top: 3px solid transparent;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.page-about .ab-role:nth-child(1) { border-top-color: var(--c-orange); }
.page-about .ab-role:nth-child(2) { border-top-color: var(--c-blue); }
.page-about .ab-role:nth-child(3) { border-top-color: var(--c-terra); }
.page-about .ab-role:nth-child(4) { border-top-color: var(--c-moss); }
.page-about .ab-role:hover {
  background: #fff;
}
.page-about .ab-role__count {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 42px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-orange);
}
.page-about .ab-role__name {
  margin: 0 0 12px;
  font-size: 20px;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--c-blue);
}
.page-about .ab-role__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-slate);
}

/* ---------- 生产流程 ---------- */
.page-about .ab-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: var(--s2);
}
.page-about .ab-flow__media {
  margin: 0;
}
.page-about .ab-flow__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.72) contrast(1.08);
}
.page-about .ab-steps {
  border-top: 1px solid var(--c-blue);
}
.page-about .ab-step {
  border-bottom: 1px solid var(--c-mist);
}
.page-about .ab-step__trigger {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 18px 0 18px 0;
  background: none;
  border: 0;
  border-left: 3px solid transparent;
  padding-left: 12px;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  color: inherit;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.page-about .ab-step__trigger:hover {
  border-left-color: var(--c-orange);
  background: rgba(255, 106, 26, .05);
}
.page-about .ab-step__trigger:focus-visible {
  outline: 2px solid var(--c-orange);
  outline-offset: -2px;
}
.page-about .ab-step__trigger[aria-expanded="true"] {
  border-left-color: var(--c-lime);
  background: rgba(184, 255, 60, .12);
}
.page-about .ab-step__num {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--c-terra);
}
.page-about .ab-step__label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}
.page-about .ab-step__name {
  font-size: 18px;
  font-weight: 900;
  color: var(--c-blue);
  letter-spacing: -0.01em;
}
.page-about .ab-step__hint {
  font-size: 13px;
  color: var(--c-slate);
}
.page-about .disclosure__state {
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--c-slate);
  white-space: nowrap;
}
.page-about .ab-step__panel {
  padding: 0 0 22px 65px;
  max-width: 44em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-slate);
}
.page-about .ab-step__panel p {
  margin: 0;
}
.page-about .ab-step .disclosure__panel {
  max-height: none;
  overflow: hidden;
  transition: max-height var(--dur) var(--ease);
}
.js .page-about .ab-step .disclosure__trigger[aria-expanded="false"] + .disclosure__panel {
  max-height: 0;
}
.js .page-about .ab-step .disclosure__trigger[aria-expanded="true"] + .disclosure__panel {
  max-height: 400px;
}

/* ---------- 分类表 ---------- */
.page-about .ab-tax {
  margin-top: var(--s2);
  border-top: 1px solid var(--c-blue);
}
.page-about .ab-tax__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--c-mist);
}
.page-about .ab-tax__label {
  font-size: 18px;
  font-weight: 900;
  color: var(--c-blue);
}
.page-about .ab-tax__by {
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-slate);
}
.page-about .ab-tax__rate {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-moss);
}

/* ---------- 项目方向标签 ---------- */
.page-about .ab-projects {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: var(--s2) 0 20px;
  padding: 0;
  list-style: none;
}
.page-about .ab-projects li {
  padding: 8px 16px;
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--c-blue);
  border: 1px solid var(--c-blue);
  clip-path: polygon(0 0, 100% 0, 100% 68%, calc(100% - 10px) 100%, 0 100%);
}

/* ---------- 广东视角 ---------- */
.page-about .ab-region {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: var(--s2);
}
.page-about .ab-region__media {
  position: relative;
  margin: 0;
}
.page-about .ab-region__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.7) contrast(1.08);
}
.page-about .ab-region__media figcaption {
  margin-top: 12px;
  padding-left: 12px;
  border-left: 2px solid var(--c-terra);
  font-size: 12px;
  letter-spacing: .1em;
  line-height: 1.7;
  color: var(--c-slate);
}
.page-about .ab-region__body .ab-node__text:last-child {
  margin-bottom: 0;
}

/* ---------- 合作 ---------- */
.page-about .ab-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: var(--s2);
  background: var(--c-mist);
  border: 1px solid var(--c-mist);
}
.page-about .ab-partner {
  background: var(--c-cream);
  padding: 28px 24px 30px;
}
.page-about .ab-partner__name {
  margin: 16px 0 10px;
  font-size: 19px;
  font-weight: 900;
  color: var(--c-blue);
}
.page-about .ab-partner__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-slate);
}
.page-about .ab-callout {
  margin-top: var(--s2);
  padding: 24px 26px;
  background: var(--c-blue);
  border-left: 4px solid var(--c-orange);
}
.page-about .ab-callout__text {
  margin: 0;
  max-width: 46em;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(246, 243, 236, .88);
}
.page-about .ab-callout .ab-link {
  color: var(--c-lime);
  border-bottom-color: var(--c-lime);
}
.page-about .ab-callout .ab-link:hover,
.page-about .ab-callout .ab-link:focus-visible {
  color: #fff;
  border-bottom-color: #fff;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-tax__row {
    grid-template-columns: 150px minmax(0, 1fr) 190px;
    align-items: baseline;
    gap: 24px;
  }
  .page-about .ab-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-node {
    grid-template-columns: 64px minmax(0, 1fr);
    column-gap: 28px;
  }
  .page-about .ab-flow {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 48px;
    align-items: start;
  }
  .page-about .ab-flow__media {
    position: sticky;
    top: 96px;
  }
  .page-about .ab-region {
    grid-template-columns: 5fr 6fr;
    gap: 44px;
    align-items: start;
  }
  .page-about .ab-roles {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .ab-step__panel {
    padding-left: 65px;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-tax__row {
    grid-template-columns: 180px minmax(0, 1fr) 220px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-step__trigger,
  .page-about .ab-role,
  .page-about .ab-link,
  .page-about .ab-step .disclosure__panel {
    transition: none;
  }
}
</main>