.page-about {
  background: var(--ink);
  --about-rail: 88px;
  --about-gap: 28px;
}

.page-about .panel-stack {
  display: grid;
  gap: var(--stack-gap);
  background: var(--ink);
}

/* ============ 首屏 ============ */
.page-about .arch-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
  padding: 22px 0 0;
}

.page-about .arch-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.5;
  background-image:
    repeating-linear-gradient(90deg, var(--ink-line) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(180deg, var(--ink-line) 0 1px, transparent 1px 96px);
}

.page-about .arch-hero > * {
  position: relative;
  z-index: 1;
}

.page-about .arch-hero .crumbs,
.page-about .arch-hero .crumbs a,
.page-about .arch-hero .crumbs span {
  color: var(--paper-line);
}

.page-about .arch-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  padding: 30px 0 0;
}

.page-about .arch-hero__main .eyebrow {
  color: var(--volt);
  margin-bottom: 14px;
}

.page-about .arch-hero__main .t-display {
  margin: 0;
  color: var(--white);
}

.page-about .arch-hero__main .lead {
  margin: 22px 0 0;
  max-width: 38em;
  color: var(--paper-soft);
}

.page-about .arch-hero__rail {
  display: none;
}

.page-about .arch-rail-text {
  display: block;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--graphite);
  padding-left: 10px;
  border-left: 1px solid var(--paper-line);
}

/* 首屏数据带 */
.page-about .arch-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ink-line);
  border-top: 1px solid var(--ink-line);
  border-bottom: 1px solid var(--ink-line);
  margin-top: var(--about-gap);
}

.page-about .arch-stat {
  background: var(--ink);
  padding: 14px 12px;
}

.page-about .arch-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1.1;
  color: var(--white);
}

.page-about .arch-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  color: var(--paper-line);
}

/* 章节索引 */
.page-about .arch-index {
  margin-top: var(--about-gap);
  padding: 16px 0 26px;
  border-top: 1px solid var(--ink-line);
}

.page-about .arch-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .arch-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-size: 14px;
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}

.page-about .arch-index__link:hover,
.page-about .arch-index__link:focus-visible {
  color: var(--volt);
  border-bottom-color: var(--volt);
}

.page-about .arch-index__link[aria-current="true"] {
  color: var(--volt);
  border-bottom-color: var(--volt);
}

.page-about .arch-index__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--clay);
}

/* ============ 画板 ============ */
.page-about .arch-panel {
  padding: 44px 0;
}

.page-about .arch-cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .arch-cols__rail {
  display: none;
}

.page-about .arch-head {
  margin-bottom: 24px;
}

.page-about .arch-head .t-annot {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  letter-spacing: 0.16em;
  color: var(--clay);
}

.page-about .arch-head h2 {
  margin: 0;
}

.page-about .arch-panel .prose p {
  margin: 0 0 16px;
}

.page-about .arch-panel .prose p:last-child {
  margin-bottom: 0;
}

/* ============ 梯队 ============ */
.page-about .arch-academy {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
  margin-bottom: var(--about-gap);
}

.page-about .arch-academy__text .lead {
  margin: 0 0 20px;
}

.page-about .arch-ages {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--paper-line);
}

.page-about .arch-age {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 4px 14px;
  padding: 13px 0;
  border-bottom: 1px solid var(--paper-line);
}

.page-about .arch-age__code {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--clay);
  align-self: center;
}

.page-about .arch-age__name {
  font-size: 15px;
  color: var(--ink);
}

.page-about .arch-age__desc {
  font-size: 13px;
  color: var(--graphite);
  line-height: 1.6;
}

/* ============ 图片 ============ */
.page-about .arch-figure {
  margin: 0;
}

.page-about .arch-figure__frame {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  border: 1px solid var(--paper-line);
}

.page-about .arch-figure__frame img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .arch-figure--tall .arch-figure__frame {
  aspect-ratio: 14 / 9;
}

.page-about .arch-figure--board .arch-figure__frame {
  aspect-ratio: 4 / 3;
  margin-bottom: var(--about-gap);
}

.page-about .arch-figure--wide .arch-figure__frame {
  aspect-ratio: 16 / 7;
}

.page-about .arch-figure__cap {
  margin-top: 10px;
  font-size: 12px;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  color: var(--graphite);
}

/* ============ 号码登记前后 ============ */
.page-about .arch-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  margin: var(--about-gap) 0;
}

.page-about .arch-split__cell {
  padding: 22px 20px;
}

.page-about .arch-split__cell .t-annot {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  letter-spacing: 0.18em;
}

.page-about .arch-split__cell h3 {
  margin: 0 0 10px;
}

.page-about .arch-split__cell p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
}

.page-about .arch-split__cell--before {
  background: var(--paper-soft);
  color: var(--ink);
}

.page-about .arch-split__cell--before .t-annot {
  color: var(--graphite);
}

.page-about .arch-split__cell--after {
  background: var(--turf);
  color: var(--paper);
}

.page-about .arch-split__cell--after .t-annot {
  color: var(--volt);
}

/* ============ 台账表格 ============ */
.page-about .arch-ledger-wrap {
  overflow-x: auto;
  border: 1px solid var(--paper-line);
  margin-bottom: 18px;
}

.page-about .arch-ledger {
  width: 100%;
  min-width: 660px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .arch-ledger__cap {
  caption-side: top;
  text-align: left;
  padding: 12px 14px;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--graphite);
  border-bottom: 1px solid var(--paper-line);
}

.page-about .arch-ledger th {
  background: var(--turf);
  color: var(--paper);
  text-align: left;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 12px 14px;
  white-space: nowrap;
}

.page-about .arch-ledger td {
  padding: 12px 14px;
  border-top: 1px solid var(--paper-line);
  vertical-align: top;
  color: var(--ink);
  line-height: 1.6;
}

.page-about .arch-ledger tbody tr:nth-child(even) td {
  background: rgba(217, 210, 195, 0.28);
}

.page-about .arch-ledger td.arch-cell--volt {
  background: var(--volt);
  color: var(--ink);
}

.page-about .arch-panel .note {
  margin: 0;
  font-size: 12px;
  color: var(--graphite);
  line-height: 1.8;
}

/* ============ 流程 ============ */
.page-about .arch-flow {
  margin-bottom: 24px;
}

.page-about .arch-flow__svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .arch-folds {
  border-top: 1px solid var(--paper-line);
  margin-bottom: 18px;
}

.page-about .arch-fold {
  border-bottom: 1px solid var(--paper-line);
}

.page-about .arch-fold summary {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  font-size: 15px;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

.page-about .arch-fold summary::-webkit-details-marker {
  display: none;
}

.page-about .arch-fold summary::after {
  content: "＋";
  font-family: var(--font-mono);
  color: var(--clay);
}

.page-about .arch-fold[open] summary::after {
  content: "－";
}

.page-about .arch-fold__body {
  padding: 0 0 16px;
  max-width: 36em;
  font-size: 14px;
  line-height: 1.75;
  color: var(--graphite);
}

/* ============ 团队 ============ */
.page-about .arch-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--paper-line);
  border: 1px solid var(--paper-line);
  margin-bottom: var(--about-gap);
}

.page-about .arch-team__cell {
  background: var(--paper);
  padding: 24px 20px;
}

.page-about .arch-team__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 42px;
  line-height: 1;
  color: var(--ink);
}

.page-about .arch-team__cell--audit .arch-team__num {
  color: var(--turf);
}

.page-about .arch-team__cell h3 {
  margin: 12px 0 0;
}

.page-about .arch-duty {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--graphite);
}

.page-about .arch-duty li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 4px;
}

.page-about .arch-duty li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--paper-line);
}

/* ============ 备案画板 ============ */
.page-about .arch-panel--ink {
  padding-bottom: 48px;
}

.page-about .arch-panel--ink .arch-head .t-annot {
  color: var(--sunrise);
}

.page-about .arch-panel--ink .prose {
  color: var(--paper-soft);
}

.page-about .arch-panel--ink .prose p {
  color: var(--paper-soft);
}

.page-about .arch-panel--ink .prose .link {
  color: var(--volt);
}

.page-about .arch-panel--ink .arch-rail-text {
  color: var(--paper-line);
  border-left-color: var(--ink-line);
}

.page-about .arch-panel--ink .arch-figure__cap {
  color: var(--paper-line);
}

.page-about .arch-panel--ink .arch-figure__frame {
  border-color: var(--ink-line);
  margin-top: var(--about-gap);
}

.page-about .arch-next {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: var(--about-gap);
}

/* ============ 断点 ============ */
@media (min-width: 768px) {
  .page-about .arch-panel {
    padding: 64px 0;
  }

  .page-about .arch-stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .arch-stat {
    padding: 18px 16px;
  }

  .page-about .arch-stat__num {
    font-size: 28px;
  }

  .page-about .arch-academy {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 40px;
  }

  .page-about .arch-age {
    grid-template-columns: 78px minmax(0, 1fr) minmax(0, 1.1fr);
    align-items: baseline;
  }

  .page-about .arch-age__code {
    grid-row: auto;
    align-self: baseline;
  }

  .page-about .arch-split {
    grid-template-columns: 62fr 38fr;
    gap: 0;
  }

  .page-about .arch-split__cell--before {
    padding: 28px 32px 28px 0;
  }

  .page-about .arch-split__cell--after {
    margin-left: -44px;
    padding: 28px 0 28px 68px;
    clip-path: polygon(13% 0, 100% 0, 100% 100%, 0 100%);
  }

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

  .page-about .arch-team__cell {
    padding: 28px 24px;
  }
}

@media (min-width: 1024px) {
  .page-about .arch-hero {
    padding-top: 28px;
  }

  .page-about .arch-hero__grid {
    grid-template-columns: minmax(0, 1fr) var(--about-rail);
    gap: 48px;
    align-items: start;
    padding-top: 44px;
  }

  .page-about .arch-hero__rail {
    display: flex;
    flex-direction: row;
    gap: 26px;
    padding-top: 8px;
  }

  .page-about .arch-cols {
    grid-template-columns: minmax(0, 1fr) var(--about-rail);
    gap: 48px;
  }

  .page-about .arch-cols__rail {
    display: block;
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .arch-rail-text {
    min-height: 180px;
  }

  .page-about .arch-index__list {
    gap: 12px 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .arch-index__link,
  .page-about .arch-split__cell,
  .page-about .arch-team__cell {
    transition: none;
  }
}