.page-about {
  --about-space: clamp(3rem, 8vw, 6.5rem);
  --hair: 1px solid var(--rule);
  --plate-shadow: 10px 10px 0 -1px var(--ink-800), 10px 10px 0 0 var(--line);
}

.page-about .about-cover,
.page-about .about-cadence,
.page-about .about-timeline,
.page-about .about-team,
.page-about .about-entries,
.page-about .about-return {
  padding-block: var(--about-space);
  overflow-x: clip;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-head);
  color: var(--fg);
}

.page-about h1 {
  font-weight: 900;
  font-size: clamp(2.05rem, 6.2vw, 4rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0.6rem 0 1.1rem;
}

.page-about h2 {
  font-weight: 800;
  font-size: clamp(1.5rem, 3.6vw, 2.4rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0 0 0.8rem;
}

.page-about h3 {
  font-weight: 700;
  font-size: 1.02rem;
  line-height: 1.45;
  margin: 0 0 0.35rem;
}

.page-about .lede {
  max-width: 62ch;
  color: var(--fg-muted);
}

.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.82rem;
  color: var(--fg-muted);
  margin-bottom: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .crumbs a {
  color: var(--fg);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--amber-light);
  border-bottom-color: var(--amber-light);
}

.page-about .crumbs [aria-current="page"] {
  color: var(--amber);
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 封面 ---------- */
.page-about .cover-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2rem, 5vw, 3.4rem);
  align-items: start;
}

.page-about .cover-figure {
  margin: 0;
}

.page-about .cover-plate {
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  box-shadow: var(--plate-shadow);
  background: var(--ink-800);
}

.page-about .cover-figure .media-cap {
  margin-top: 1.1rem;
}

.page-about .cover-facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem 2.2rem;
  margin: clamp(1.5rem, 3vw, 2rem) 0 0;
  padding: 1.2rem 0 0;
  border-top: var(--hair);
}

.page-about .cover-facts li {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.page-about .fact-num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  line-height: 1;
  color: var(--amber);
}

.page-about .fact-label {
  font-size: 0.84rem;
  color: var(--fg-muted);
}

.page-about .cover-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: clamp(1.4rem, 3vw, 1.9rem);
}

.page-about .order-keys {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.8rem;
  margin: clamp(2rem, 5vw, 3rem) 0 0;
  padding: clamp(1.1rem, 2.5vw, 1.5rem) 0 0;
  border-top: var(--hair);
}

.page-about .key-link {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.85rem 1rem;
  border: var(--hair);
  border-radius: var(--radius-s);
  color: var(--fg);
  text-decoration: none;
  font-size: 0.9rem;
  transition: transform 0.18s var(--ease), border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .key-link .mono {
  color: var(--amber);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
}

.page-about .key-link:hover,
.page-about .key-link:focus-visible {
  transform: translateY(-2px);
  border-color: var(--amber);
  color: var(--amber-light);
}

/* ---------- 维护节奏 ---------- */
.page-about .cadence-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.8rem, 4vw, 3rem);
  margin-top: clamp(1.6rem, 4vw, 2.4rem);
  align-items: start;
}

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

.page-about .cadence-step {
  position: relative;
  padding: 1.15rem 0 1.15rem 3.4rem;
  border-bottom: var(--hair);
}

.page-about .cadence-step:first-child {
  border-top: var(--hair);
}

.page-about .step-no {
  position: absolute;
  left: 0;
  top: 1.15rem;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--amber);
}

.page-about .cadence-step p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--fg-muted);
}

.page-about .cadence-figure {
  margin: 0;
}

.page-about .cadence-figure .media-frame {
  border: var(--hair);
  border-radius: var(--radius-s);
  background: var(--paper);
}

.page-about .cadence-figure .media-cap {
  margin-top: 0.9rem;
}

/* ---------- 版本沿革 ---------- */
.page-about .version-track {
  list-style: none;
  margin: clamp(1.6rem, 4vw, 2.4rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  border-top: var(--hair);
}

.page-about .version-node {
  position: relative;
  padding: 1.15rem 0 1.15rem 3.6rem;
  border-bottom: var(--hair);
}

.page-about .version-node::before {
  content: "";
  position: absolute;
  left: 1.05rem;
  top: 1.55rem;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--celadon);
}

.page-about .version-node--current::before {
  background: var(--amber);
  width: 11px;
  height: 11px;
  left: 0.85rem;
  top: 1.4rem;
}

.page-about .node-id {
  position: absolute;
  left: 0;
  top: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--celadon-mist);
}

.page-about .version-node--current .node-id {
  color: var(--amber);
}

.page-about .node-when {
  margin: 0 0 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-muted);
}

.page-about .version-node--current .node-when {
  color: var(--amber);
}

.page-about .node-desc {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--fg-muted);
}

.page-about .timeline-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.6rem;
  margin-top: clamp(1.4rem, 3vw, 2rem);
}

.page-about .timeline-foot .note {
  margin: 0;
  color: var(--fg-muted);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.8rem, 4vw, 3rem);
  align-items: start;
}

.page-about .team-counts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
  margin: clamp(1.4rem, 3vw, 2rem) 0 0;
  padding-top: 1.2rem;
  border-top: var(--hair);
}

.page-about .team-count dt {
  font-size: 0.8rem;
  color: var(--fg-muted);
  margin-bottom: 0.35rem;
}

.page-about .team-count dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 4.6vw, 2.6rem);
  line-height: 1;
  color: var(--amber);
}

.page-about .team-figure {
  margin: 0;
}

.page-about .team-figure .media-frame {
  border: var(--hair);
  border-radius: var(--radius-s);
  background: var(--ink-800);
}

.page-about .team-figure .media-cap {
  margin-top: 0.9rem;
}

.page-about .partner-notes {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin: clamp(2rem, 4vw, 2.8rem) 0 0;
  padding: 0;
}

.page-about .partner-notes li {
  padding: 1rem 1.1rem;
  border: var(--hair);
  border-left: 3px solid var(--celadon);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  background: rgba(19, 42, 63, 0.55);
}

.page-about .note-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--celadon);
  margin-bottom: 0.4rem;
}

.page-about .partner-notes p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--fg-muted);
}

/* ---------- 入口一览 ---------- */
.page-about .entry-kinds {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
  margin-top: clamp(1.6rem, 4vw, 2.4rem);
}

.page-about .kind-card {
  display: block;
  padding: 1.15rem 1.2rem;
  border: var(--hair);
  border-radius: var(--radius-s);
  background: transparent;
  color: var(--fg);
  text-decoration: none;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .kind-card:hover,
.page-about .kind-card:focus-visible {
  transform: translateY(-3px);
  border-color: var(--amber);
  box-shadow: 4px 4px 0 0 var(--amber);
}

.page-about .kind-no {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--amber);
  margin-bottom: 0.5rem;
}

.page-about .kind-card p {
  margin: 0 0 0.7rem;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--fg-muted);
}

.page-about .kind-go {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--celadon);
}

/* 排列切换 */
.page-about .index-switch {
  position: relative;
  margin-top: clamp(2rem, 4vw, 2.8rem);
  border-top: var(--hair);
  padding-top: clamp(1.2rem, 3vw, 1.8rem);
}

.page-about .idx-radio {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .idx-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
}

.page-about .idx-tab {
  display: inline-block;
  padding: 0.5rem 1rem;
  border: var(--hair);
  border-radius: var(--radius-pill);
  font-size: 0.84rem;
  color: var(--fg);
  cursor: pointer;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .idx-tab:hover {
  border-color: var(--amber);
  color: var(--amber);
}

.page-about #idx-alpha:checked ~ .idx-tabs label[for="idx-alpha"],
.page-about #idx-num:checked ~ .idx-tabs label[for="idx-num"],
.page-about #idx-cat:checked ~ .idx-tabs label[for="idx-cat"] {
  background: var(--ink-900);
  border-color: var(--ink-900);
  color: var(--paper);
}

.page-about #idx-alpha:focus-visible ~ .idx-tabs label[for="idx-alpha"],
.page-about #idx-num:focus-visible ~ .idx-tabs label[for="idx-num"],
.page-about #idx-cat:focus-visible ~ .idx-tabs label[for="idx-cat"] {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

.page-about .idx-panel {
  list-style: none;
  margin: 0;
  padding: 0;
  display: none;
}

.page-about #idx-alpha:checked ~ .idx-panels .idx-panel--alpha,
.page-about #idx-num:checked ~ .idx-panels .idx-panel--num,
.page-about #idx-cat:checked ~ .idx-panels .idx-panel--cat {
  display: block;
}

.page-about .idx-panel--alpha,
.page-about .idx-panel--num {
  display: none;
}

.page-about .idx-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.35rem 0.9rem;
  align-items: baseline;
  padding: 0.85rem 0;
  border-bottom: var(--hair);
}

.page-about .idx-item:first-child {
  border-top: var(--hair);
}

.page-about .idx-key {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-about .idx-name {
  font-size: 0.94rem;
  line-height: 1.55;
  color: var(--fg);
  text-decoration: none;
}

.page-about a.idx-name {
  border-bottom: 1px solid transparent;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about a.idx-name:hover,
.page-about a.idx-name:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

.page-about .idx-meta {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--fg-muted);
  margin-top: 0.25rem;
}

.page-about .idx-group-body h3 {
  margin: 0 0 0.3rem;
  font-size: 0.98rem;
}

.page-about .idx-group-body p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--fg-muted);
}

.page-about .idx-inline-link {
  color: var(--celadon);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  margin-left: 0.3rem;
  transition: color 0.18s var(--ease);
}

.page-about .idx-inline-link:hover,
.page-about .idx-inline-link:focus-visible {
  color: var(--amber);
}

/* ---------- 回访路径 ---------- */
.page-about .return-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.8rem, 4vw, 3rem);
  align-items: start;
}

.page-about .return-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: clamp(1.3rem, 3vw, 1.8rem);
}

.page-about .return-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.page-about .return-step {
  position: relative;
  padding: 1.15rem 1.2rem 1.15rem 3.4rem;
  border: var(--hair);
  border-radius: var(--radius-s);
  background: rgba(19, 42, 63, 0.5);
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .return-step:hover {
  transform: translateY(-2px);
  border-color: var(--amber);
}

.page-about .return-step .step-no {
  top: 1.2rem;
  left: 1.2rem;
}

.page-about .return-step p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--fg-muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .order-keys {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .partner-notes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .cover-grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
  }

  .page-about .cadence-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.95fr);
  }

  .page-about .return-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  }

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

@media (min-width: 960px) {
  .page-about .version-track {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    border-top: none;
  }

  .page-about .version-node {
    padding: 2.5rem 1.1rem 0 0;
    border-bottom: none;
    border-top: var(--hair);
  }

  .page-about .version-node::before,
  .page-about .version-node--current::before {
    left: 0;
    top: -4px;
    width: 7px;
    height: 7px;
  }

  .page-about .version-node--current::before {
    width: 11px;
    height: 11px;
    top: -6px;
  }

  .page-about .node-id {
    position: static;
    display: block;
    margin-bottom: 0.55rem;
  }

  .page-about .node-when {
    margin-bottom: 0.35rem;
  }
}

@media (min-width: 1100px) {
  .page-about .idx-item {
    grid-template-columns: 5rem minmax(0, 1fr);
    gap: 0.4rem 1.2rem;
  }

  .page-about .idx-panel--alpha .idx-name,
  .page-about .idx-panel--num .idx-name {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 1rem;
  }

  .page-about .idx-meta {
    margin-top: 0;
    text-align: right;
    flex: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .key-link,
  .page-about .kind-card,
  .page-about .return-step,
  .page-about .idx-tab,
  .page-about a.idx-name,
  .page-about .crumbs a {
    transition: none;
  }

  .page-about .key-link:hover,
  .page-about .key-link:focus-visible,
  .page-about .kind-card:hover,
  .page-about .kind-card:focus-visible,
  .page-about .return-step:hover {
    transform: none;
  }
}
<<<END>>>