.page-about {
  --about-rail: 96px;
  --about-gap: 40px;
  --about-pad: 72px;
  --about-hair-gold: rgba(226, 192, 121, 0.28);
  --about-hair-ink: rgba(13, 14, 17, 0.14);
  --about-tint-ink: rgba(226, 192, 121, 0.06);
  --about-tint-paper: rgba(39, 86, 127, 0.05);
}

@media (min-width: 760px) {
  .page-about {
    --about-pad: 96px;
    --about-gap: 56px;
  }
}

/* ========== 首屏 ========== */
.page-about .about-intro {
  padding-top: 28px;
  padding-bottom: var(--about-pad);
}

.page-about .about-intro .breadcrumb {
  margin-bottom: 44px;
}

.page-about .about-intro .eyebrow {
  display: block;
  margin: 0 0 18px;
}

.page-about .about-intro .t-h1 {
  margin: 0 0 26px;
  max-width: 18ch;
}

.page-about .about-intro .lede {
  max-width: 40em;
  margin: 0 0 56px;
  color: var(--paper-200);
}

.page-about .about-toc {
  border-top: 1px solid var(--about-hair-gold);
  padding-top: 22px;
}

.page-about .about-toc-label {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  color: var(--gold-300);
  text-transform: uppercase;
}

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

@media (min-width: 760px) {
  .page-about .about-toc .index-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 56px;
  }
}

.page-about .about-toc .index-item {
  border-bottom: 1px solid rgba(226, 192, 121, 0.16);
}

.page-about .index-link {
  display: grid;
  grid-template-columns: 48px 1fr;
  grid-template-areas:
    "no title"
    "no meta";
  column-gap: 12px;
  align-items: baseline;
  padding: 14px 4px;
  text-decoration: none;
  color: var(--porcelain-000);
  transition: background-color var(--dur-mid) var(--ease),
    color var(--dur-mid) var(--ease);
}

.page-about .index-link:hover {
  background-color: var(--about-tint-ink);
  color: var(--gold-300);
}

.page-about .index-link .index-no {
  grid-area: no;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  letter-spacing: 0.06em;
  color: var(--gold-600);
}

.page-about .index-link .index-title {
  grid-area: title;
  font-family: var(--font-title);
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.page-about .index-link .index-meta {
  grid-area: meta;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--muted-500);
}

/* ========== 阶段轴 ========== */
.page-about .phase-block {
  padding-top: var(--about-pad);
  padding-bottom: var(--about-pad);
  position: relative;
}

.page-about .phase-block + .phase-block {
  border-top: 1px solid var(--about-hair-gold);
}

.page-about .phase-block--lead .zone-head {
  margin-bottom: 48px;
}

.page-about .phase-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

@media (min-width: 700px) {
  .page-about .phase-row {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 0 var(--about-gap);
  }
}

.page-about .phase-no {
  position: relative;
  padding-top: 4px;
  min-height: 32px;
}

.page-about .phase-dot {
  position: absolute;
  left: 0;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold-600);
  transition: background-color var(--dur-mid) var(--ease),
    box-shadow var(--dur-mid) var(--ease);
}

.page-about .phase-label {
  display: block;
  padding-left: 22px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.page-about .phase-no::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 22px;
  bottom: calc(-1 * var(--about-pad));
  width: 1px;
  background: var(--about-hair-gold);
}

.page-about .phase-block:last-child .phase-no::before {
  display: none;
}

.page-about .zone--ink .phase-label,
.page-about .zone--deep .phase-label {
  color: var(--gold-300);
}

.page-about .zone--paper .phase-label,
.page-about .zone--paper-2 .phase-label {
  color: var(--blue-700);
}

.page-about .zone--ink .phase-dot,
.page-about .zone--deep .phase-dot {
  background: var(--gold-300);
}

.page-about .zone--paper .phase-dot,
.page-about .zone--paper-2 .phase-dot {
  background: var(--gold-600);
}

.page-about .phase-block:target .phase-dot {
  box-shadow: 0 0 0 6px rgba(226, 192, 121, 0.2);
}

.page-about .phase-block:target .phase-body {
  background-color: var(--about-tint-ink);
}

.page-about .zone--paper.phase-block:target .phase-body,
.page-about .zone--paper-2.phase-block:target .phase-body {
  background-color: var(--about-tint-paper);
}

.page-about .phase-body {
  padding: 4px 4px 8px;
  transition: background-color var(--dur-slow) var(--ease);
}

.page-about .phase-body .t-h3 {
  margin: 0 0 14px;
}

.page-about .phase-body p {
  margin: 0 0 14px;
  max-width: 40em;
  line-height: 1.9;
}

.page-about .phase-body p:last-child {
  margin-bottom: 0;
}

.page-about .phase-body--split {
  display: grid;
  gap: 28px;
}

@media (min-width: 900px) {
  .page-about .phase-body--split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 360px);
    gap: 56px;
    align-items: start;
  }
}

.page-about .phase-media {
  margin: 0;
}

/* ========== 核对流程 ========== */
.page-about .flow-section {
  padding-top: var(--about-pad);
  padding-bottom: var(--about-pad);
}

.page-about .flow-section .zone-head {
  margin-bottom: 48px;
}

.page-about .flow-grid {
  display: grid;
  gap: 40px;
}

@media (min-width: 900px) {
  .page-about .flow-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 64px;
    align-items: start;
  }
}

.page-about .flow-media {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .flow-media .media-frame {
  margin: 0;
}

.page-about .flow-note {
  margin: 0;
  padding-left: 20px;
  border-left: 2px solid var(--gold-600);
  color: var(--paper-200);
}

.page-about .flow-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.page-about .flow-list .disclosure {
  border-top: 1px solid var(--about-hair-gold);
}

.page-about .flow-list .disclosure:last-child {
  border-bottom: 1px solid var(--about-hair-gold);
}

.page-about .flow-list .disclosure summary {
  padding: 18px 8px 18px 22px;
  font-family: var(--font-title);
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  color: var(--porcelain-000);
  position: relative;
  cursor: pointer;
  list-style: none;
  transition: color var(--dur-mid) var(--ease);
}

.page-about .flow-list .disclosure summary::-webkit-details-marker {
  display: none;
}

.page-about .flow-list .disclosure summary::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 3px;
  background: transparent;
  transition: background-color var(--dur-mid) var(--ease);
}

.page-about .flow-list .disclosure summary::after {
  content: "+";
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--gold-600);
  transition: color var(--dur-mid) var(--ease);
}

.page-about .flow-list .disclosure[open] summary {
  color: var(--gold-300);
}

.page-about .flow-list .disclosure[open] summary::before {
  background: var(--gold-600);
}

.page-about .flow-list .disclosure[open] summary::after {
  content: "−";
  color: var(--gold-300);
}

.page-about .flow-list .disclosure-body {
  padding: 0 22px 22px;
}

.page-about .flow-list .disclosure-body p {
  margin: 0;
  max-width: 40em;
  color: var(--paper-200);
  line-height: 1.9;
}

/* ========== 编号体系 ========== */
.page-about .num-section {
  padding-top: var(--about-pad);
  padding-bottom: var(--about-pad);
}

.page-about .num-section .zone-head {
  margin-bottom: 44px;
}

.page-about .num-banner {
  margin: 0 0 40px;
}

.page-about .num-lede {
  max-width: 40em;
  margin: 0 0 36px;
}

.page-about .num-svg-wrap {
  border-top: 1px solid var(--about-hair-ink);
  border-bottom: 1px solid var(--about-hair-ink);
  padding: 28px 0;
  overflow-x: auto;
}

.page-about .org-svg {
  display: block;
  width: 100%;
  min-width: 560px;
  height: auto;
}

.page-about .org-row {
  transition: opacity var(--dur-mid) var(--ease);
}

.page-about .org-svg:hover .org-row {
  opacity: 0.32;
}

.page-about .org-svg .org-row:hover {
  opacity: 1;
}

.page-about .org-name {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  fill: var(--muted-500);
}

.page-about .org-hair {
  stroke: var(--ink-900);
  stroke-width: 1;
  opacity: 0.15;
}

.page-about .org-cell {
  fill: none;
  stroke-width: 1.5;
  opacity: 0.55;
  transition: opacity var(--dur-mid) var(--ease),
    stroke-width var(--dur-mid) var(--ease);
}

.page-about .org-cell--gold {
  stroke: var(--gold-600);
}

.page-about .org-cell--blue {
  stroke: var(--blue-700);
}

.page-about .org-cell--stamp {
  stroke: var(--stamp-600);
}

.page-about .org-row:hover .org-cell {
  opacity: 1;
  stroke-width: 2.5;
}

.page-about .org-cell-txt {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-anchor: middle;
  fill: var(--ink-900);
}

.page-about .org-sep {
  font-family: var(--font-mono);
  font-size: 16px;
  text-anchor: middle;
  fill: var(--muted-500);
}

.page-about .org-note {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  fill: var(--muted-500);
}

/* ========== 站务分工 ========== */
.page-about .team-section {
  padding-top: var(--about-pad);
  padding-bottom: var(--about-pad);
}

.page-about .team-section .zone-head {
  margin-bottom: 48px;
}

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

@media (min-width: 760px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    column-gap: 40px;
  }
}

.page-about .team-item {
  padding: 28px 0;
  border-top: 1px solid var(--about-hair-gold);
}

.page-about .team-count {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  color: var(--gold-300);
  line-height: 1;
}

.page-about .team-count .stat-figure {
  font-size: clamp(2.6rem, 5vw, 3.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--gold-300);
}

.page-about .team-count .stat-unit {
  font-size: 1rem;
  letter-spacing: 0.06em;
  color: var(--gold-600);
}

.page-about .team-name {
  margin: 0 0 10px;
  font-family: var(--font-title);
  font-size: 1.18rem;
  letter-spacing: -0.01em;
  color: var(--porcelain-000);
}

.page-about .team-role {
  margin: 0;
  max-width: 30em;
  color: var(--paper-200);
  line-height: 1.85;
}

.page-about .team-total {
  margin: 40px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--about-hair-gold);
  font-family: var(--font-mono);
  font-size: 0.92rem;
  letter-spacing: 0.02em;
  color: var(--paper-200);
}

.page-about .team-total .num {
  color: var(--blue-200);
  font-weight: 700;
}

/* ========== 内容底线 ========== */
.page-about .rules-section {
  padding-top: var(--about-pad);
  padding-bottom: var(--about-pad);
}

.page-about .rules-section .zone-head {
  margin-bottom: 44px;
}

.page-about .rules-grid {
  display: grid;
  gap: 36px;
}

@media (min-width: 900px) {
  .page-about .rules-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 64px;
    align-items: start;
  }
}

.page-about .rules-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-hair-ink);
}

.page-about .rule-item {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 0 20px;
  align-items: baseline;
  padding: 18px 0;
  border-bottom: 1px solid var(--about-hair-ink);
}

.page-about .rule-no {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--blue-700);
}

.page-about .rule-item p {
  margin: 0;
  line-height: 1.85;
}

.page-about .rules-note {
  margin: 0;
  padding: 22px 0 0;
  max-width: 34em;
  color: var(--muted-500);
  border-top: 1px solid var(--about-hair-ink);
  line-height: 1.9;
}

/* ========== 与其他栏目的关系 ========== */
.page-about .relation-section {
  padding-top: var(--about-pad);
  padding-bottom: var(--about-pad);
}

.page-about .relation-section .zone-head {
  margin-bottom: 44px;
}

.page-about .relation-links {
  display: grid;
  gap: 0;
}

@media (min-width: 760px) {
  .page-about .relation-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 56px;
  }
}

.page-about .relation-link {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  grid-template-areas:
    "no title"
    "no desc";
  column-gap: 16px;
  align-items: baseline;
  padding: 22px 4px;
  border-top: 1px solid var(--about-hair-gold);
  text-decoration: none;
  color: var(--porcelain-000);
  transition: background-color var(--dur-mid) var(--ease),
    color var(--dur-mid) var(--ease);
}

.page-about .relation-link:hover {
  background-color: var(--about-tint-ink);
  color: var(--gold-300);
}

.page-about .relation-no {
  grid-area: no;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  letter-spacing: 0.06em;
  color: var(--gold-600);
}

.page-about .relation-title {
  grid-area: title;
  font-family: var(--font-title);
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

.page-about .relation-desc {
  grid-area: desc;
  margin-top: 6px;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--muted-500);
}

/* ========== 停顿区 ========== */
.page-about .pause-zone {
  padding-top: calc(var(--about-pad) * 1.15);
  padding-bottom: calc(var(--about-pad) * 1.15);
}

.page-about .pause-line {
  margin: 0;
  max-width: 16ch;
  font-family: var(--font-title);
  font-size: clamp(1.9rem, 4.5vw, 3rem);
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--ink-900);
}

/* ========== 无障碍与降级 ========== */
@media (prefers-reduced-motion: reduce) {
  .page-about .index-link,
  .page-about .relation-link,
  .page-about .phase-body,
  .page-about .phase-dot,
  .page-about .flow-list .disclosure summary,
  .page-about .flow-list .disclosure summary::before,
  .page-about .org-cell,
  .page-about .org-row {
    transition: none;
  }
}

@media (max-width: 480px) {
  .page-about .rule-item {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .page-about .relation-link,
  .page-about .index-link {
    grid-template-columns: 40px minmax(0, 1fr);
  }
}
<<<END>>>