/* ============ 品牌沿革 · page-about ============ */

.page-about {
  background: var(--pitch-deep);
  color: var(--cold);
  --about-rule-cold: rgba(246, 248, 244, 0.18);
  --about-rule-cold-strong: rgba(246, 248, 244, 0.38);
  --about-rule-ink: rgba(16, 19, 15, 0.18);
  --about-stripe: rgba(246, 248, 244, 0.035);
  --about-gap: clamp(48px, 8vw, 112px);
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 44px) 0 clamp(44px, 7vw, 88px);
  background: var(--pitch-deep);
  border-bottom: var(--bw) solid var(--about-rule-cold);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    90deg,
    var(--about-stripe) 0 1px,
    transparent 1px 86px
  );
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(32px, 5vw, 64px);
  align-items: start;
}

.page-about .about-hero .breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--cold-52);
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .about-hero .breadcrumb a {
  color: var(--cold-52);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .about-hero .breadcrumb a:hover,
.page-about .about-hero .breadcrumb a:focus-visible {
  color: var(--neon);
  border-bottom-color: var(--neon);
}

.page-about .about-hero .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--neon);
  margin: 0 0 16px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6vw, 72px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--cold);
  margin: 0 0 clamp(18px, 3vw, 28px);
  max-width: 15em;
}

.page-about .about-hero__title::after {
  content: "";
  display: block;
  width: clamp(64px, 12vw, 132px);
  height: 8px;
  margin-top: clamp(16px, 2.6vw, 26px);
  background: var(--neon);
}

.page-about .about-hero__lead {
  font-family: var(--font-body);
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.75;
  color: var(--cold-70);
  max-width: 34em;
  margin: 0 0 clamp(24px, 3.4vw, 36px);
}

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

/* 导读目录 */
.page-about .about-toc {
  border: var(--bw) solid var(--neon);
  box-shadow: var(--shadow-hard-neon);
  background: rgba(6, 26, 20, 0.72);
  padding: clamp(18px, 2.6vw, 26px);
}

.page-about .about-toc__head {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--neon);
  margin: 0 0 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-rule-cold);
}

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

.page-about .about-toc .toc-item + .toc-item {
  border-top: 1px solid var(--about-rule-cold);
}

.page-about .about-toc .toc-link {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 10px;
  padding: 11px 0;
  text-decoration: none;
  color: var(--cold);
  transition: color var(--dur) var(--ease);
}

.page-about .about-toc .toc-link:hover,
.page-about .about-toc .toc-link:focus-visible {
  color: var(--neon);
}

.page-about .about-toc .toc-index {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cold-52);
}

.page-about .about-toc .toc-link:hover .toc-index,
.page-about .about-toc .toc-link:focus-visible .toc-index {
  color: var(--neon);
}

.page-about .about-toc .toc-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  letter-spacing: -0.01em;
}

.page-about .about-toc .toc-note {
  font-family: var(--font-body);
  font-size: 12px;
  color: var(--cold-52);
  white-space: nowrap;
}

/* ---------- 章节通用 ---------- */
.page-about .section {
  position: relative;
  padding: var(--about-gap) 0;
}

.page-about .section--deep {
  background: var(--pitch);
  border-top: var(--bw) solid var(--about-rule-cold);
  border-bottom: var(--bw) solid var(--about-rule-cold);
}

.page-about .section--paper {
  background: var(--paper);
  color: var(--ink);
  border-top: var(--bw) solid var(--pitch-deep);
  border-bottom: var(--bw) solid var(--pitch-deep);
}

.page-about .section-head {
  position: relative;
  margin-bottom: clamp(32px, 5vw, 60px);
  max-width: 48em;
}

.page-about .section-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(36px, 6vw, 76px);
  line-height: 0.86;
  letter-spacing: -0.03em;
  color: var(--neon);
  opacity: 0.34;
  margin: 0 0 14px;
  transition: opacity 0.4s var(--ease);
}

.page-about .section.is-current .section-num {
  opacity: 1;
}

.page-about .section--paper .section-num {
  color: var(--brick);
  opacity: 0.42;
}

.page-about .section--paper.is-current .section-num {
  opacity: 1;
}

.page-about .section-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--neon);
  margin: 0 0 12px;
}

.page-about .section--paper .section-kicker {
  color: var(--brick);
}

.page-about .section-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.6vw, 46px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  color: inherit;
}

.page-about .section-lead {
  font-family: var(--font-body);
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.78;
  color: var(--cold-70);
  margin: 0;
}

.page-about .section--paper .section-lead {
  color: var(--steel);
}

.page-about .section p {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.78;
}

/* ---------- 01 看台视角 ---------- */
.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .about-origin__body > p {
  color: var(--cold-70);
  margin: 0 0 26px;
}

.page-about .origin-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--bw) solid var(--about-rule-cold-strong);
}

.page-about .origin-item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  column-gap: 14px;
  padding: 20px 0;
  border-bottom: 1px solid var(--about-rule-cold);
}

.page-about .origin-item__mark {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--neon);
  line-height: 1.2;
}

.page-about .origin-item__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -0.01em;
  margin: 0 0 6px;
  color: var(--cold);
}

.page-about .origin-item p {
  grid-column: 2;
  margin: 0;
  font-size: 15px;
  color: var(--cold-52);
}

.page-about .about-origin__aside {
  position: relative;
  border-left: var(--bw) solid var(--neon);
  padding-left: 20px;
}

.page-about .aside-note {
  border: 1px solid var(--about-rule-cold);
  background: rgba(6, 26, 20, 0.6);
  padding: 16px 18px;
}

.page-about .aside-note__sum {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--neon);
  cursor: pointer;
  list-style: none;
}

.page-about .aside-note__sum::-webkit-details-marker {
  display: none;
}

.page-about .aside-note__sum::before {
  content: "+ ";
  color: var(--neon);
}

.page-about .aside-note[open] .aside-note__sum::before {
  content: "− ";
}

.page-about .aside-note p {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--cold-70);
}

.page-about .about-origin__aside .side-note {
  display: none;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--cold-52);
  margin: 24px 0 0;
}

.page-about .about-origin__figure {
  margin-top: clamp(32px, 5vw, 60px);
}

/* ---------- 02 内容版图 ---------- */
.page-about .about-map__board {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-rule-cold);
  border: var(--bw) solid var(--neon);
  margin-bottom: clamp(30px, 4.5vw, 52px);
}

.page-about .about-map__board .score-cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(16px, 2.4vw, 26px);
  background: var(--pitch-deep);
}

.page-about .about-map__board .score-value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 4.6vw, 52px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}

.page-about .about-map__board .score-label {
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--cold-52);
}

.page-about .about-map__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border: var(--bw) solid var(--about-rule-cold-strong);
}

.page-about .map-card {
  padding: clamp(20px, 2.6vw, 30px);
  border-bottom: 1px solid var(--about-rule-cold);
  background: rgba(6, 26, 20, 0.45);
  transition: background var(--dur) var(--ease);
}

.page-about .map-card:last-child {
  border-bottom: 0;
}

.page-about .map-card:hover {
  background: rgba(203, 242, 76, 0.06);
}

.page-about .map-card__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--neon);
  margin: 0 0 12px;
}

.page-about .map-card__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -0.01em;
  margin: 0 0 10px;
  color: var(--cold);
}

.page-about .map-card__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--cold-52);
}

.page-about .about-map__foot {
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding-left: 18px;
  border-left: 6px solid var(--neon);
  font-size: 15px;
  color: var(--cold-70);
  max-width: 46em;
}

/* ---------- 03 俱乐部简史 ---------- */
.page-about .about-history__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
}

.page-about .about-history__lead p {
  color: var(--ink);
  margin: 0 0 18px;
}

.page-about .about-history__panel {
  border: var(--bw) solid var(--pitch-deep);
  background: var(--paper-dim);
  box-shadow: var(--shadow-hard);
  padding: clamp(20px, 2.8vw, 32px);
}

.page-about .about-history__panel-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
  padding-bottom: 12px;
  border-bottom: var(--bw) solid var(--brick);
  color: var(--ink);
}

.page-about .fact-list {
  margin: 0 0 22px;
}

.page-about .fact-row {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px solid var(--about-rule-ink);
}

.page-about .fact-row dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--brick);
  padding-top: 3px;
}

.page-about .fact-row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

/* ---------- 04 编辑部 ---------- */
.page-about .about-desk__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}

.page-about .about-desk__figure {
  margin: 0;
}

.page-about .about-desk__roles {
  border-top: var(--bw) solid var(--about-rule-cold-strong);
}

.page-about .desk-role {
  border-bottom: 1px solid var(--about-rule-cold);
  padding: 18px 0;
}

.page-about .desk-role__head {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  align-items: baseline;
  gap: 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .desk-role__head::-webkit-details-marker {
  display: none;
}

.page-about .desk-role__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(28px, 3.6vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}

.page-about .desk-role__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--cold);
}

.page-about .desk-role__name::after {
  content: " ›";
  color: var(--cold-52);
  font-family: var(--font-mono);
}

.page-about .desk-role[open] .desk-role__name::after {
  content: " ⌄";
  color: var(--neon);
}

.page-about .desk-role__text {
  margin: 10px 0 0 78px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--cold-52);
}

/* ---------- 05 来源与时间 ---------- */
.page-about .about-source__table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: clamp(30px, 4.5vw, 50px);
  font-size: 15px;
}

.page-about .about-source__table th,
.page-about .about-source__table td {
  text-align: left;
  padding: 14px 16px;
  border-bottom: 1px solid var(--about-rule-ink);
  vertical-align: top;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-source__table thead th {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--brick);
  border-bottom: var(--bw) solid var(--brick);
}

.page-about .about-source__table tbody th {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  white-space: nowrap;
}

.page-about .about-source__table .num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--steel);
  white-space: nowrap;
}

.page-about .about-source__timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: var(--bw) solid var(--brick);
}

.page-about .about-source__timeline .timeline-item {
  position: relative;
  padding: 0 0 26px 24px;
}

.page-about .about-source__timeline .timeline-item::before {
  content: "";
  position: absolute;
  left: -9px;
  top: 8px;
  width: 12px;
  height: 12px;
  background: var(--brick);
}

.page-about .about-source__timeline .timeline-item:last-child {
  padding-bottom: 0;
}

.page-about .about-source__timeline .timeline-time {
  display: block;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--brick);
  margin-bottom: 6px;
}

.page-about .about-source__timeline p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink);
}

/* ---------- 06 发展脉络 ---------- */
.page-about .about-era {
  overflow: hidden;
}

.page-about .about-era__inner {
  position: relative;
}

.page-about .about-era__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.14;
  pointer-events: none;
}

.page-about .about-era__head {
  position: relative;
  z-index: 1;
}

.page-about .era-track {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  border-left: var(--bw) solid var(--about-rule-cold-strong);
}

.page-about .era-node {
  position: relative;
  padding: 22px 20px 26px;
  border-bottom: var(--bw) solid var(--about-rule-cold);
  background: rgba(6, 26, 20, 0.55);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .era-node:focus-visible {
  outline: 3px solid var(--neon);
  outline-offset: -3px;
}

.page-about .era-node__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--neon);
  border: 1px solid var(--neon);
  padding: 3px 9px;
  margin-bottom: 14px;
}

.page-about .era-node__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin: 0 0 10px;
  color: var(--cold);
}

.page-about .era-node__detail {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--cold-52);
}

/* ---------- 07 协作网络 ---------- */
.page-about .about-network__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border: var(--bw) solid var(--pitch-deep);
}

.page-about .net-cell {
  padding: clamp(20px, 2.6vw, 30px);
  border-bottom: 1px solid var(--about-rule-ink);
  background: var(--paper);
}

.page-about .net-cell:last-child {
  border-bottom: 0;
}

.page-about .net-cell__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(32px, 4.6vw, 48px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--brick);
  font-variant-numeric: tabular-nums;
  margin-bottom: 12px;
}

.page-about .net-cell__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
  color: var(--ink);
}

.page-about .net-cell p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .about-network__note {
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding-left: 18px;
  border-left: 6px solid var(--brick);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
  max-width: 46em;
}

/* ---------- 08 一起把资料做厚 ---------- */
.page-about .about-join__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 4.5vw, 56px);
  align-items: start;
}

.page-about .about-join__text .section-num {
  margin-bottom: 10px;
}

.page-about .about-join__text .section-kicker {
  margin-bottom: 10px;
}

.page-about .about-join__text .section-title {
  margin-bottom: 18px;
}

.page-about .about-join__text p {
  color: var(--cold-70);
  margin: 0 0 16px;
  max-width: 40em;
}

.page-about .about-join__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-join__card {
  border: var(--bw) solid var(--neon);
  background: rgba(6, 26, 20, 0.7);
  box-shadow: var(--shadow-hard-neon);
  padding: clamp(20px, 2.8vw, 30px);
}

.page-about .about-join__card-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-rule-cold);
  color: var(--cold);
}

.page-about .contact-mini {
  margin: 0 0 18px;
}

.page-about .contact-mini__row {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px solid var(--about-rule-cold);
}

.page-about .contact-mini__row:last-child {
  border-bottom: 0;
}

.page-about .contact-mini dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--neon);
  padding-top: 2px;
}

.page-about .contact-mini dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--cold);
  word-break: break-word;
}

.page-about .contact-mini dd.num {
  font-family: var(--font-mono);
  font-size: 14px;
}

.page-about .about-join__card-note {
  margin: 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--cold-52);
}

.page-about .visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 响应式 ---------- */
@media (min-width: 680px) {
  .page-about .about-map__board {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .map-card {
    border-right: 1px solid var(--about-rule-cold);
  }

  .page-about .map-card:nth-child(2n) {
    border-right: 0;
  }

  .page-about .map-card--wide {
    grid-column: 1 / -1;
    border-right: 0;
  }

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

  .page-about .net-cell {
    border-right: 1px solid var(--about-rule-ink);
  }

  .page-about .net-cell:nth-child(2n) {
    border-right: 0;
  }

  .page-about .net-cell:nth-last-child(-n + 2) {
    border-bottom: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(40px, 5vw, 80px);
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-history__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-desk__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
  }

  .page-about .about-join__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-origin__aside .side-note {
    display: block;
  }

  .page-about .era-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    border-left: 0;
    border-top: var(--bw) solid var(--about-rule-cold-strong);
    background: var(--about-rule-cold);
    gap: 1px;
  }

  .page-about .era-node {
    border-bottom: 0;
    border-right: 0;
    padding: 30px 22px 34px;
    background: var(--pitch-deep);
  }

  .page-about .era-node::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 22px;
    height: 5px;
    background: var(--neon);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.24s var(--ease);
  }

  .page-about .era-node:hover,
  .page-about .era-node:focus-visible {
    background: rgba(203, 242, 76, 0.08);
  }

  .page-about .era-node:hover::before,
  .page-about .era-node:focus-visible::before {
    transform: scaleX(1);
  }
}

@media (min-width: 1120px) {
  .page-about .about-map__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .map-card:nth-child(2n) {
    border-right: 1px solid var(--about-rule-cold);
  }

  .page-about .map-card:nth-child(3n) {
    border-right: 0;
  }

  .page-about .map-card--wide {
    grid-column: 1 / -1;
  }

  .page-about .about-network__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .net-cell {
    border-right: 1px solid var(--about-rule-ink);
    border-bottom: 0;
  }

  .page-about .net-cell:nth-child(2n) {
    border-right: 1px solid var(--about-rule-ink);
  }

  .page-about .net-cell:last-child {
    border-right: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .section-num,
  .page-about .map-card,
  .page-about .era-node,
  .page-about .era-node::before {
    transition: none;
  }
}