.page-about {
  display: block;
  padding-bottom: 0;
  --ab-sec-pad: 56px;
}

.page-about .ab-hero {
  padding-top: 4px;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: 28px;
  padding: 20px 0 0;
}

.page-about .ab-hero__copy h1 {
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.12;
  font-size: clamp(30px, 7.2vw, 56px);
  color: var(--board);
  margin: 12px 0 18px;
}

.page-about .ab-hero__copy .lede {
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink);
  margin: 0 0 14px;
}

.page-about .ab-hero__note {
  font-size: 14px;
  line-height: 1.7;
  color: var(--stone);
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--orange);
}

.page-about .ab-hero__media {
  border: 1px solid var(--grid);
  background: var(--stand);
  margin: 0;
}

.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.04);
}

.page-about .media__caption {
  display: block;
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--stone);
  border-top: 1px solid var(--grid);
}

.page-about .ab-ticks {
  margin-top: 32px;
  height: 24px;
  border-bottom: 1px solid var(--grid);
  background-image: repeating-linear-gradient(
    to right,
    var(--grid) 0,
    var(--grid) 1px,
    transparent 1px,
    transparent 44px
  );
  background-position: 0 100%;
  background-size: 44px 16px;
  background-repeat: repeat-x;
}

.page-about .ab-ticks__label {
  margin: 10px 0 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--stone);
}

.page-about .ab-ticks__label .mono {
  font-family: var(--font-mono);
  color: var(--lime);
  letter-spacing: 0.02em;
}

.page-about .ab-sec {
  padding-top: var(--ab-sec-pad);
}

.page-about .ab-sec__head {
  display: grid;
  gap: 10px;
  margin-bottom: 30px;
}

.page-about .ab-no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--lime);
}

.page-about .ab-sec h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.14;
  font-size: clamp(23px, 4.6vw, 40px);
  color: var(--board);
}

.page-about .ab-sec__lead {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--stone);
}

/* 数据来源 */
.page-about .ab-src {
  display: grid;
  gap: 26px;
}

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

.page-about .ab-src__list li {
  padding: 20px 0;
  border-top: 1px solid var(--grid);
}

.page-about .ab-src__list li:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .ab-src__list h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--board);
}

.page-about .ab-src__list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink);
}

.page-about .ab-src__side {
  border: 1px solid var(--grid);
  background: var(--stand);
  padding: 22px 20px;
}

.page-about .ab-src__side-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--stone);
}

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

.page-about .ab-facts > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--grid);
}

.page-about .ab-facts > div:first-child {
  border-top: 1px solid var(--grid);
}

.page-about .ab-facts dt {
  font-size: 14px;
  color: var(--ink);
}

.page-about .ab-facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  color: var(--lime);
}

.page-about .ab-src__side-note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone);
}

/* 校对流程 */
.page-about .ab-check {
  display: grid;
  gap: 28px;
}

.page-about .ab-flow {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-flow__step {
  position: relative;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  padding-bottom: 26px;
}

.page-about .ab-flow__step::after {
  content: "";
  position: absolute;
  left: 21px;
  top: 48px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--grid), transparent);
}

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

.page-about .ab-flow__step:last-child::after {
  display: none;
}

.page-about .ab-flow__dot {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border: 1px solid var(--grid);
  background: var(--stand);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--lime);
}

.page-about .ab-flow__body h3 {
  margin: 6px 0 6px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--board);
}

.page-about .ab-flow__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink);
}

.page-about .ab-check__media {
  margin: 0;
  border: 1px solid var(--grid);
  background: var(--stand);
}

.page-about .ab-check__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* 团队 */
.page-about .ab-team {
  display: grid;
  gap: 26px;
}

.page-about .ab-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--grid);
  background: var(--stand);
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-table {
  width: 100%;
  min-width: 580px;
  border-collapse: collapse;
  text-align: left;
}

.page-about .ab-table th,
.page-about .ab-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--grid);
  vertical-align: top;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .ab-table thead th {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--stone);
  background: var(--pitch);
  font-weight: 500;
}

.page-about .ab-table tbody th {
  font-weight: 600;
  color: var(--board);
  width: 30%;
}

.page-about .ab-table tbody tr:nth-child(even) {
  background: rgba(36, 56, 44, 0.42);
}

.page-about .ab-table .mono {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--lime);
  letter-spacing: 0.02em;
}

.page-about .ab-team__media {
  margin: 0;
  border: 1px solid var(--grid);
  background: var(--stand);
}

.page-about .ab-team__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

/* 版本演进时间轴 */
.page-about .ab-ver {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-ver__item {
  display: grid;
  gap: 10px;
}

.page-about .ab-ver__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 22px;
  letter-spacing: 0.04em;
  color: var(--lime);
}

.page-about .ab-ver__card {
  border: 1px solid var(--grid);
  background: var(--stand);
}

.page-about .ab-ver__card > summary {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .ab-ver__card > summary::-webkit-details-marker,
.page-about .ab-ver__card > summary::marker {
  display: none;
  content: "";
}

.page-about .ab-ver__card > summary::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--lime);
}

.page-about .ab-ver__card[open] > summary::after {
  content: "－";
}

.page-about .ab-ver__card > summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -2px;
}

.page-about .ab-ver__title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--board);
}

.page-about .ab-ver__body {
  padding: 0 16px 18px;
  border-top: 1px solid var(--grid);
}

.page-about .ab-ver__body p {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink);
}

/* 合作生态 */
.page-about .ab-eco__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
}

.page-about .ab-eco__tabs button {
  font: inherit;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--stone);
  background: transparent;
  border: 1px solid var(--grid);
  padding: 10px 16px;
  cursor: pointer;
  transition: color 180ms var(--ease), background-color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .ab-eco__tabs button:hover {
  color: var(--board);
  border-color: var(--stone);
}

.page-about .ab-eco__tabs button[aria-selected="true"] {
  color: var(--pitch);
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .ab-eco__tabs button:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

.page-about .ab-eco__panels {
  display: grid;
  gap: 16px;
}

.page-about .ab-eco__panel {
  border-top: 1px solid var(--grid);
  padding-top: 18px;
}

.page-about .ab-eco__panel[hidden] {
  display: none;
}

.page-about .ab-eco__num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  color: var(--orange);
  letter-spacing: 0.02em;
}

.page-about .ab-eco__panel h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 18px;
  color: var(--board);
}

.page-about .ab-eco__panel p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink);
}

/* 荣誉 */
.page-about .ab-honor {
  background: var(--board);
  color: var(--pitch);
  padding: 30px 22px;
  clip-path: polygon(0 0, 100% 0, calc(100% - 22px) 100%, 0 100%);
}

.page-about .ab-honor__years {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--clay);
}

.page-about .ab-honor h2 {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(21px, 4.4vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--pitch);
  max-width: 34ch;
}

.page-about .ab-honor p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--pitch);
  opacity: 0.78;
}

/* 合作与纠错 */
.page-about .ab-cta {
  padding-bottom: 72px;
}

.page-about .ab-cta__grid {
  display: grid;
  gap: 18px;
  margin-bottom: 28px;
}

.page-about .ab-cta__item {
  border: 1px solid var(--grid);
  border-left: 2px solid var(--lime);
  background: var(--stand);
  padding: 22px 20px;
}

.page-about .ab-cta__item h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 18px;
  color: var(--board);
}

.page-about .ab-cta__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
}

@media (min-width: 760px) {
  .page-about {
    --ab-sec-pad: 72px;
  }

  .page-about .ab-check {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .ab-eco__panels {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
  }

  .page-about .ab-cta__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .ab-honor {
    padding: 44px 48px;
    clip-path: polygon(0 0, 100% 0, calc(100% - 56px) 100%, 0 100%);
  }

  .page-about .ab-ver {
    gap: 8px;
  }

  .page-about .ab-ver__item {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 40px;
    position: relative;
  }

  .page-about .ab-ver__item::before {
    content: "";
    position: absolute;
    left: 80px;
    top: 24px;
    width: 17px;
    height: 1px;
    background: var(--lime);
  }

  .page-about .ab-ver__year {
    font-size: 22px;
    padding-top: 14px;
    text-align: left;
  }
}

@media (min-width: 920px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: end;
    padding-top: 34px;
  }

  .page-about .ab-src {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 40px;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-eco__tabs button {
    transition: none;
  }
}