.page-about {
  --ab-panel-radius: 4px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: 34px 0 0;
  background:
    repeating-linear-gradient(90deg, var(--line-soft) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(180deg, var(--line-soft) 0 1px, transparent 1px 72px),
    linear-gradient(158deg, var(--ink-900) 0%, var(--ink-700) 58%, var(--ink-900) 100%);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .ab-hero__inner {
  padding-bottom: 38px;
}

.page-about .ab-hero__title {
  margin: 16px 0 0;
  max-width: 15em;
  line-height: 1.2;
}

.page-about .ab-hero__lede {
  margin-top: 20px;
  max-width: var(--read);
  color: var(--mist);
}

.page-about .ab-hero__stats {
  margin-top: 34px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-hero__stats .stat {
  padding: 16px 14px 18px;
  background: rgba(11, 27, 43, .78);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .ab-hero__stats .stat__value {
  font-size: 26px;
  font-weight: 700;
  color: var(--paper);
  letter-spacing: .01em;
}

.page-about .ab-hero__stats .stat:nth-child(1) .stat__value,
.page-about .ab-hero__stats .stat:nth-child(3) .stat__value {
  color: var(--amber-300);
}

.page-about .ab-hero__stats .stat__label {
  font-size: 12px;
  color: var(--mist);
  letter-spacing: .08em;
}

.page-about .ab-hero__scale {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  padding: 0 0 0 max(18px, calc((100% - var(--wrap)) / 2));
  height: 22px;
  overflow: hidden;
}

.page-about .ab-hero__scale span {
  flex: 0 0 auto;
  width: 26px;
  background: var(--line-strong);
}

.page-about .ab-hero__scale span:nth-child(odd) { height: 10px; }
.page-about .ab-hero__scale span:nth-child(even) { height: 18px; }
.page-about .ab-hero__scale span:nth-child(3) { background: var(--amber-500); height: 22px; }
.page-about .ab-hero__scale span:nth-child(7) { background: var(--celadon-500); height: 14px; }

@media (min-width: 720px) {
  .page-about .ab-hero__stats { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 1040px) {
  .page-about .ab-hero { padding-top: 48px; }
  .page-about .ab-hero__stats { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .page-about .ab-hero__stats .stat__value { font-size: 30px; }
}

/* ---------- 沿革时间轴 ---------- */
.page-about .ab-history__body {
  display: grid;
  gap: 28px;
}

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

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

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--amber-500) 0%, var(--celadon-500) 62%, rgba(95, 168, 148, 0) 100%);
}

.page-about .ab-node {
  position: relative;
  padding-left: 30px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-node:last-child { border-bottom: 0; }

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 17px;
  width: 15px;
  height: 15px;
  border: 1px solid var(--amber-500);
  border-radius: 50%;
  background: var(--ink-900);
  transition: background 160ms var(--ease), box-shadow 160ms var(--ease);
}

.page-about .ab-node[open]::before {
  background: var(--amber-500);
  box-shadow: 0 0 0 4px rgba(232, 163, 61, .16);
}

.page-about .ab-node__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  padding: 15px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-node__head:focus-visible {
  outline: 2px solid var(--amber-500);
  outline-offset: 3px;
}

.page-about .ab-node__year {
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--amber-300);
}

.page-about .ab-node__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-node:hover .ab-node__title { color: var(--amber-300); }

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

.page-about .ab-node__body p {
  margin: 0;
  max-width: var(--read);
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

@media (min-width: 1024px) {
  .page-about .ab-history__body {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 44px;
    align-items: start;
  }
}

/* ---------- 厅别与编号 ---------- */
.page-about .ab-halls {
  display: grid;
  gap: 14px;
  margin-top: 4px;
}

.page-about .ab-hall {
  display: block;
  padding: 22px 18px 24px;
  background: var(--ink-700);
  border-top: 2px solid var(--celadon-500);
  text-decoration: none;
  transition: background 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .ab-hall:nth-child(odd) { border-top-color: var(--amber-500); }

.page-about .ab-hall:hover,
.page-about .ab-hall:focus-visible {
  background: var(--ink-500);
}

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

.page-about .ab-hall__code {
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--amber-300);
  margin-bottom: 10px;
}

.page-about .ab-hall__name {
  display: block;
  font-size: 20px;
  font-weight: 700;
  color: var(--paper);
  letter-spacing: .02em;
}

.page-about .ab-hall__desc {
  display: block;
  margin: 12px 0 18px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .ab-hall__link {
  display: inline-block;
  font-size: 13px;
  color: var(--celadon-200);
  letter-spacing: .04em;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: border-color 160ms var(--ease), color 160ms var(--ease);
}

.page-about .ab-hall:hover .ab-hall__link {
  color: var(--amber-300);
  border-bottom-color: var(--amber-500);
}

.page-about .ab-code {
  margin-top: 26px;
  display: grid;
  gap: 20px;
  padding: 26px 20px;
  background: var(--ink-700);
  border-left: 3px solid var(--amber-500);
}

.page-about .ab-code__text p {
  margin: 10px 0 0;
  max-width: var(--read);
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .ab-code__sample {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-content: flex-start;
}

.page-about .ab-code__chip {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .12em;
  padding: 7px 12px;
  color: var(--mist);
  border: 1px solid var(--line-strong);
}

.page-about .ab-code__chip--amber {
  color: var(--ink-900);
  background: var(--amber-500);
  border-color: var(--amber-500);
  font-weight: 700;
}

.page-about .ab-code__chip--celadon {
  color: var(--ink-900);
  background: var(--celadon-500);
  border-color: var(--celadon-500);
  font-weight: 700;
}

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

@media (min-width: 900px) {
  .page-about .ab-code {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
    padding: 30px 28px;
  }
}

@media (min-width: 1080px) {
  .page-about .ab-halls { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* ---------- 厂商目录 ---------- */
.page-about .ab-vendor-grid {
  display: grid;
  gap: 26px;
}

.page-about .ab-vendor__text p {
  margin: 0 0 16px;
  max-width: var(--read);
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .ab-vendor__text .lede {
  color: var(--paper);
  font-size: 17px;
}

.page-about .ab-vendor__list {
  list-style: none;
  margin: 22px 0 24px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-vendor__list li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 0 10px 14px;
  border-left: 2px solid var(--celadon-500);
  font-size: 14px;
  color: var(--mist);
  background: linear-gradient(90deg, rgba(28, 58, 87, .55), rgba(28, 58, 87, 0) 82%);
}

.page-about .ab-vendor__list .num {
  font-size: 20px;
  font-weight: 700;
  color: var(--amber-300);
}

.page-about .ab-vendor__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .ab-vendor__side {
  display: grid;
  gap: 18px;
}

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

.page-about .ab-region {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 20px 18px;
  background: var(--ink-700);
  border-left: 4px solid var(--celadon-500);
  transition: background 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .ab-region:hover,
.page-about .ab-region:focus-visible {
  background: var(--ink-500);
  outline: none;
}

.page-about .ab-region:focus-visible {
  border-left-color: var(--amber-500);
  box-shadow: inset 0 0 0 1px var(--amber-500);
}

.page-about .ab-region--key {
  background: linear-gradient(90deg, rgba(232, 163, 61, .22), var(--ink-700) 72%);
  border-left-color: var(--amber-500);
}

.page-about .ab-region--total {
  border-left-color: var(--mist);
}

.page-about .ab-region__name {
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .ab-region__num {
  font-size: 26px;
  font-weight: 700;
  color: var(--paper);
  opacity: .45;
  transition: opacity 160ms var(--ease), color 160ms var(--ease);
}

.page-about .ab-region__unit {
  font-size: 13px;
  color: var(--mist);
}

.page-about .ab-region:hover .ab-region__num,
.page-about .ab-region:focus-visible .ab-region__num {
  opacity: 1;
  color: var(--amber-300);
}

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

@media (min-width: 1024px) {
  .page-about .ab-vendor-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: 44px;
    align-items: start;
  }
}

/* ---------- 团队与校验 ---------- */
.page-about .ab-roles {
  display: grid;
  gap: 14px;
}

.page-about .ab-role {
  padding: 24px 18px 26px;
  background: var(--ink-700);
  border-top: 1px solid var(--line-strong);
  transition: background 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .ab-role:hover {
  background: var(--ink-500);
  border-top-color: var(--amber-500);
}

.page-about .ab-role__icon {
  display: block;
  width: 32px;
  height: 32px;
  color: var(--celadon-500);
  margin-bottom: 16px;
}

.page-about .ab-role:nth-child(2) .ab-role__icon { color: var(--amber-500); }

.page-about .ab-role__name {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--paper);
  letter-spacing: .02em;
}

.page-about .ab-role p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .ab-subtitle {
  margin: 44px 0 0;
  font-size: 18px;
  font-weight: 700;
  color: var(--paper);
  letter-spacing: .02em;
}

.page-about .ab-checks {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .ab-check {
  padding: 16px 13px 18px;
  background: var(--ink-700);
  border-top: 2px solid var(--line-strong);
  transition: background 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .ab-check:hover {
  background: var(--ink-500);
  border-top-color: var(--amber-500);
}

.page-about .ab-check:first-child { border-top-color: var(--amber-500); }
.page-about .ab-check:last-child { border-top-color: var(--celadon-500); }

.page-about .ab-check__num {
  display: block;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--amber-300);
  margin-bottom: 8px;
}

.page-about .ab-check__name {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
  margin-bottom: 8px;
}

.page-about .ab-check__tip {
  display: block;
  font-size: 13px;
  line-height: 1.66;
  color: var(--mist);
}

.page-about .ab-team__figure {
  margin: 30px 0 0;
}

@media (min-width: 768px) {
  .page-about .ab-roles { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .page-about .ab-checks { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

/* ---------- 互校 ---------- */
.page-about .ab-cross__grid {
  margin-top: 4px;
}

.page-about .ab-cross__grid .panel {
  padding: 24px 20px 26px;
  background: var(--ink-700);
}

.page-about .ab-cross__grid .panel p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

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

.page-about .ab-cross__link { margin-top: 18px; }

/* ---------- 编号条带与收尾 ---------- */
.page-about .ab-strip {
  display: flex;
  gap: 10px;
  margin-top: 4px;
  padding: 16px 0 22px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-strip__item {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .12em;
  padding: 8px 14px;
  color: var(--mist);
  border: 1px solid var(--line);
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .ab-strip__item:hover {
  color: var(--amber-300);
  border-color: var(--amber-500);
}

.page-about .ab-strip__item--now {
  color: var(--ink-900);
  background: var(--amber-500);
  border-color: var(--amber-500);
  font-weight: 700;
}

.page-about .ab-tail__cta {
  margin-top: 12px;
  padding: 26px 20px;
  display: grid;
  gap: 18px;
  background: linear-gradient(120deg, var(--ink-700) 0%, rgba(18, 38, 58, .35) 100%);
  border-left: 3px solid var(--celadon-500);
}

.page-about .ab-tail__cta p {
  margin: 0;
  max-width: var(--read);
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .ab-tail__cta .btn {
  justify-self: start;
}

@media (min-width: 768px) {
  .page-about .ab-tail__cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 30px 28px;
  }
}

/* ---------- 无障碍与动效收敛 ---------- */
.page-about a:focus-visible,
.page-about summary:focus-visible,
.page-about [tabindex]:focus-visible {
  outline: 2px solid var(--amber-500);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
  }
}