.page-about {
  --ab-soft: #46584F;
  --ab-line-light: #CBD8D1;
  --ab-tl: 62px;
}

/* 面包屑 */
.page-about .ab-crumb {
  padding-top: 20px;
  padding-bottom: 4px;
}

/* 首屏 */
.page-about .ab-hero {
  position: relative;
  padding-bottom: 8px;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: 30px;
  align-items: end;
}

.page-about .ab-hero__title {
  margin: 14px 0 18px;
  font-size: clamp(2.15rem, 9vw, 4.2rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--paper);
}

.page-about .ab-hero__lede {
  max-width: 60ch;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.8;
  margin: 0 0 26px;
}

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

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .ab-hero__stat {
  padding: 16px 14px 18px;
  background: var(--panel);
  min-width: 0;
}

.page-about .ab-hero__stat dt {
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
  margin: 0 0 8px;
}

.page-about .ab-hero__stat dd {
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(1.5rem, 6vw, 2rem);
  line-height: 1;
  font-weight: 700;
  color: var(--blue);
  letter-spacing: -0.01em;
}

.page-about .ab-unit {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 400;
  color: var(--muted);
  margin-left: 4px;
}

.page-about .ab-hero__media {
  position: relative;
  margin-top: 34px;
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 36px), calc(100% - 36px) 100%, 0 100%);
}

.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  height: clamp(170px, 34vw, 340px);
  max-width: 100%;
  object-fit: cover;
  filter: brightness(0.7) saturate(0.85);
}

.page-about .ab-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(53, 242, 200, 0.16), transparent 42%),
    linear-gradient(0deg, rgba(7, 18, 15, 0.9), transparent 62%);
  pointer-events: none;
}

/* 通用区块 */
.page-about .ab-section {
  padding: 60px 0;
}

.page-about .ab-sect-head {
  margin-bottom: 30px;
  max-width: 62ch;
}

.page-about .ab-sect-head h2,
.page-about .ab-close h2 {
  margin: 10px 0 12px;
  font-size: clamp(1.55rem, 5.4vw, 2.35rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--paper);
}

.page-about .ab-sect-lede {
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.8;
  margin: 0;
}

/* 起点 */
.page-about .ab-origin__grid {
  display: grid;
  gap: 30px;
}

.page-about .ab-origin__body p {
  color: var(--muted);
  line-height: 1.85;
  margin: 0 0 16px;
}

.page-about .ab-origin__big {
  font-size: clamp(1.1rem, 3.6vw, 1.35rem);
  line-height: 1.7;
  color: var(--paper) !important;
  padding-left: 16px;
  border-left: 2px solid var(--orange);
}

.page-about .ab-origin__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
  align-self: start;
}

.page-about .ab-origin__facts li {
  background: var(--panel-2);
  padding: 16px 16px 18px;
  display: grid;
  gap: 6px;
}

.page-about .ab-origin__num {
  font-family: var(--font-num);
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .ab-origin__label {
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* 团队 */
.page-about .ab-team-section {
  background: var(--panel-2);
  border-top: 1px solid var(--grid);
  border-bottom: 1px solid var(--grid);
}

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

.page-about .ab-team__cell {
  position: relative;
  padding: 18px 16px 20px;
  background: var(--panel);
  border: 1px solid var(--grid);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: background 200ms var(--ease), border-color 200ms var(--ease);
  outline: none;
}

.page-about .ab-team__cell:hover,
.page-about .ab-team__cell:focus-visible {
  background: #102A21;
  border-color: var(--cyan);
}

.page-about .ab-team__cell::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 26px;
  height: 2px;
  background: var(--orange);
}

.page-about .ab-team__num {
  font-family: var(--font-num);
  font-size: 1.9rem;
  line-height: 1;
  font-weight: 700;
  color: var(--cyan);
  margin: 0 0 10px;
  transition: color 200ms var(--ease);
}

.page-about .ab-team__cell:hover .ab-team__num,
.page-about .ab-team__cell:focus-visible .ab-team__num {
  color: var(--blue);
}

.page-about .ab-team__name {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .ab-team__desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
  transition: color 200ms var(--ease);
}

.page-about .ab-team__cell:hover .ab-team__desc,
.page-about .ab-team__cell:focus-visible .ab-team__desc {
  color: var(--paper);
}

/* 校验流程 */
.page-about .ab-check {
  background-color: var(--ink);
  background-image:
    linear-gradient(var(--grid-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-soft) 1px, transparent 1px);
  background-size: 24px 24px;
}

.page-about .ab-check__grid {
  display: grid;
  gap: 30px;
}

.page-about .ab-flow {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  margin-bottom: 24px;
  border: 1px solid var(--grid);
  background: rgba(14, 36, 28, 0.55);
}

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

.page-about .ab-node {
  border-bottom: 1px solid var(--grid);
  padding: 14px 0 14px 14px;
  border-left: 2px solid var(--grid);
  transition: border-color 180ms var(--ease);
}

.page-about .ab-node[open] {
  border-left-color: var(--cyan);
}

.page-about .ab-node__sum {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--paper);
  outline: none;
}

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

.page-about .ab-node__sum:focus-visible {
  color: var(--cyan);
}

.page-about .ab-node__dot {
  flex: none;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 1.5px solid var(--cyan);
}

.page-about .ab-node__dot--blue {
  border-color: var(--blue);
}

.page-about .ab-node__dot--orange {
  border-color: var(--orange);
}

.page-about .ab-node__body {
  margin: 10px 0 0 19px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .ab-check__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: brightness(0.78) saturate(0.9);
}

/* 里程碑 */
.page-about .ab-timeline {
  display: grid;
  gap: 30px;
}

.page-about .ab-timeline__list {
  display: grid;
  gap: 0;
}

.page-about .ab-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: var(--ab-tl) minmax(0, 1fr);
  column-gap: 16px;
  padding-bottom: 32px;
}

.page-about .ab-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  left: calc(var(--ab-tl) / 2);
  top: 26px;
  bottom: 0;
  width: 1px;
  background: var(--grid);
}

.page-about .ab-timeline__item:last-child::before {
  display: none;
}

.page-about .ab-timeline__dot {
  position: absolute;
  left: calc(var(--ab-tl) / 2 - 6px);
  top: 8px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  border: 1.5px solid var(--cyan);
  background: var(--ink);
  box-shadow: 0 0 0 4px rgba(53, 242, 200, 0.08);
}

.page-about .ab-timeline__year {
  font-family: var(--font-num);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--orange);
  line-height: 1.4;
  margin: 4px 0 0;
  text-align: right;
}

.page-about .ab-timeline__body h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-timeline__body p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .ab-timeline__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: brightness(0.8);
}

/* 三条标准：浅色反转块 */
.page-about .ab-standards {
  background: var(--light);
  color: var(--ink);
  padding: 56px 0;
  margin-top: 12px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), 0 100%);
}

.page-about .ab-standards__eyebrow {
  margin: 0;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: #0F6B57;
  text-transform: uppercase;
}

.page-about .ab-sect-head--dark h2 {
  color: var(--ink);
}

.page-about .ab-sect-head--dark .ab-sect-lede {
  color: var(--ab-soft);
}

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

.page-about .ab-standard {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  column-gap: 16px;
  padding: 22px 0;
  border-bottom: 1px solid var(--ab-line-light);
}

.page-about .ab-standard__idx {
  font-family: var(--font-num);
  font-size: 0.95rem;
  font-weight: 700;
  color: #0F6B57;
  letter-spacing: 0.04em;
  padding-top: 3px;
}

.page-about .ab-standard h3 {
  margin: 0 0 8px;
  font-size: 1.15rem;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .ab-standard p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--ab-soft);
  max-width: 62ch;
}

/* 收束 */
.page-about .ab-close {
  padding: 56px 0 70px;
}

.page-about .ab-close__inner {
  display: grid;
  gap: 26px;
  border-top: 1px solid var(--grid);
  padding-top: 34px;
}

.page-about .ab-close__left p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
  font-size: 0.95rem;
  max-width: 58ch;
}

.page-about .ab-close__score {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0 0 18px;
  font-family: var(--font-num);
  font-size: clamp(2.6rem, 13vw, 4.4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--blue);
  letter-spacing: -0.02em;
}

.page-about .ab-close__denom {
  font-size: 1rem;
  color: var(--muted);
  font-weight: 400;
}

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

/* 平板与桌面 */
@media (min-width: 720px) {
  .page-about {
    --ab-tl: 86px;
  }

  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 44px;
  }

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

  .page-about .ab-origin__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .ab-check__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .ab-timeline {
    grid-template-columns: minmax(0, 1fr) 230px;
    gap: 44px;
    align-items: start;
  }

  .page-about .ab-close__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: start;
    gap: 44px;
  }

  .page-about .ab-standards {
    padding: 72px 0 84px;
  }

  .page-about .ab-section {
    padding: 84px 0;
  }
}

@media (min-width: 900px) {
  .page-about {
    --ab-tl: 104px;
  }

  .page-about .ab-team {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .ab-team__cell:nth-child(1),
  .page-about .ab-team__cell:nth-child(2) {
    grid-column: span 3;
  }

  .page-about .ab-team__cell:nth-child(3),
  .page-about .ab-team__cell:nth-child(4),
  .page-about .ab-team__cell:nth-child(5) {
    grid-column: span 2;
  }

  .page-about .ab-team__cell {
    padding: 22px 20px 24px;
  }

  .page-about .ab-team__num {
    font-size: 2.3rem;
  }

  .page-about .ab-hero__title {
    font-size: clamp(3rem, 5.6vw, 4.6rem);
  }

  .page-about .ab-close__score {
    font-size: 5rem;
  }
}

/* 桌面指针设备：角色说明悬停/聚焦展开 */
@media (min-width: 900px) and (hover: hover) and (pointer: fine) {
  .page-about .ab-team__desc {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 220ms var(--ease), opacity 200ms var(--ease), color 200ms var(--ease);
  }

  .page-about .ab-team__cell:hover .ab-team__desc,
  .page-about .ab-team__cell:focus-visible .ab-team__desc,
  .page-about .ab-team__cell:focus-within .ab-team__desc {
    max-height: 160px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-team__cell,
  .page-about .ab-team__num,
  .page-about .ab-team__desc,
  .page-about .ab-node {
    transition-duration: 120ms;
  }

  .page-about .ab-team__cell:hover .ab-team__desc,
  .page-about .ab-team__cell:focus-visible .ab-team__desc {
    max-height: none;
  }
}
<<<END>>>