.page-about {
  --ab-rail: 168px;
  --ab-paper: 6px;
}

/* ---------- 首屏档案头 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 18px;
  padding-block: clamp(28px, 5vw, 56px) clamp(20px, 3vw, 36px);
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 7.2vw, 60px);
  line-height: 1.02;
  letter-spacing: -0.01em;
  max-width: 20ch;
}

.page-about .about-lede {
  margin: 0;
  max-width: 38ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--chalk);
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 8px;
}

.page-about .about-stat {
  border-left: 2px solid var(--teal);
  padding-left: 12px;
  min-width: 0;
}

.page-about .about-stat .stat-label,
.page-about .about-stat .stat-note {
  display: block;
}

@media (min-width: 720px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 人员构成比例带 ---------- */
.page-about .section--band {
  padding-block: clamp(20px, 4vw, 40px);
}

.page-about .roster-band {
  display: grid;
  gap: 18px;
  padding: clamp(20px, 4vw, 34px) var(--gut);
  background: linear-gradient(180deg, var(--ink-2), var(--ink) 92%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .roster-head {
  display: grid;
  gap: 8px;
}

.page-about .roster-sum {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mute);
}

.page-about .roster-bar {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: var(--board);
}

.page-about .roster-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .roster-item {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto auto;
  align-items: baseline;
  gap: 10px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--line);
}

.page-about .roster-key {
  width: 12px;
  height: 12px;
  align-self: center;
  border: 1px solid var(--line);
}

.page-about .roster-key--teal {
  background: var(--teal);
}

.page-about .roster-key--mist {
  background: var(--mist);
}

.page-about .roster-key--dim {
  background: rgba(53, 224, 190, 0.42);
}

.page-about .roster-name {
  font-size: 15px;
  color: var(--chalk);
}

.page-about .roster-num {
  font-size: 22px;
  font-weight: 700;
  color: var(--teal);
}

.page-about .roster-share {
  font-size: 13px;
  color: var(--mute);
  min-width: 5.2em;
  text-align: right;
}

@media (min-width: 860px) {
  .page-about .roster-legend {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .roster-item {
    grid-template-columns: 12px minmax(0, 1fr) auto;
    grid-template-areas:
      "key name num"
      ".  share share";
    row-gap: 4px;
    border-bottom: 0;
    border-left: 1px solid var(--line);
    padding: 0 0 0 14px;
  }

  .page-about .roster-key { grid-area: key; }
  .page-about .roster-name { grid-area: name; }
  .page-about .roster-num { grid-area: num; }
  .page-about .roster-share { grid-area: share; text-align: left; }
}

/* ---------- 档案条目通用骨架 ---------- */
.page-about .entry {
  display: grid;
  gap: 20px;
  padding-block: clamp(34px, 5vw, 64px);
  border-top: 1px solid var(--line);
}

.page-about .entry:first-of-type {
  border-top: 0;
}

.page-about .entry--last {
  padding-bottom: clamp(44px, 7vw, 88px);
}

.page-about .entry-rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .entry-num {
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--teal);
}

.page-about .entry-label {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mute);
}

.page-about .entry-body {
  display: grid;
  gap: 18px;
  min-width: 0;
}

.page-about .entry-body h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4.4vw, 34px);
  line-height: 1.06;
  letter-spacing: -0.005em;
}

.page-about .entry-body h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.2;
}

.page-about .entry-lede {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
}

@media (min-width: 900px) {
  .page-about .entry {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 52px);
  }

  .page-about .entry-rail {
    flex-direction: column;
    gap: 10px;
    position: sticky;
    top: calc(var(--bar-h) + 28px);
    align-self: start;
  }

  .page-about .entry-num {
    font-size: 44px;
  }
}

/* ---------- 图文容器 ---------- */
.page-about .origin-figure {
  margin: 4px 0 0;
}

.page-about .flow-figure {
  margin: 6px 0 0;
}

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

/* ---------- 三支小组 ---------- */
.page-about .crew-list {
  display: grid;
  gap: 18px;
}

.page-about .crew-card {
  position: relative;
  padding: 20px 20px 22px;
  background: var(--board);
  border: 1px solid var(--line);
  box-shadow: var(--ab-paper) var(--ab-paper) 0 -1px var(--ink), var(--ab-paper) var(--ab-paper) 0 0 var(--line);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .crew-card:hover {
  transform: translate(-2px, -2px);
  border-color: rgba(53, 224, 190, 0.4);
}

.page-about .crew-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.page-about .crew-num {
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--teal);
}

.page-about .crew-out,
.page-about .crew-hand {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
}

.page-about .crew-out {
  color: var(--chalk);
}

.page-about .crew-hand {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  color: var(--mute);
}

.page-about .crew-hand a,
.page-about .prose a,
.page-about .entry-lede a,
.page-about .flow-rule a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid rgba(155, 231, 214, 0.5);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .crew-hand a:hover,
.page-about .prose a:hover,
.page-about .entry-lede a:hover,
.page-about .flow-rule a:hover {
  color: var(--teal);
  border-bottom-color: var(--teal);
}

@media (min-width: 720px) {
  .page-about .crew-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .crew-card--wide {
    grid-column: 1 / -1;
    background: linear-gradient(120deg, var(--board), var(--ink-2));
  }
}

/* ---------- 三道流程 ---------- */
.page-about .flow-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .flow-item {
  position: relative;
  padding: 0 0 26px 46px;
}

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

.page-about .flow-item:not(:last-child)::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 26px;
  bottom: 4px;
  width: 1px;
  background: linear-gradient(180deg, var(--teal), var(--line));
}

.page-about .flow-dot {
  position: absolute;
  left: 6px;
  top: 6px;
  width: 15px;
  height: 15px;
  border: 1px solid var(--teal);
  background: var(--ink);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .flow-item:hover .flow-dot {
  background: var(--teal);
  box-shadow: 0 0 0 4px rgba(53, 224, 190, 0.14);
}

.page-about .flow-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}

.page-about .flow-idx {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--teal);
}

.page-about .flow-rule {
  margin: 8px 0 0;
  max-width: 50ch;
  font-size: 15px;
  line-height: 1.7;
  color: var(--chalk);
  transition: color var(--dur) var(--ease);
}

.page-about .flow-item:hover .flow-rule {
  color: #fff;
}

.page-about .flow-item:hover .flow-head h3 {
  color: var(--teal);
}

/* ---------- 版本轨道 ---------- */
.page-about .ver-layout {
  display: grid;
  gap: 20px;
}

.page-about .ver-node {
  border: 1px solid var(--line);
  background: var(--ink-2);
  margin-bottom: 10px;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .ver-node:last-child {
  margin-bottom: 0;
}

.page-about .ver-node[open] {
  background: var(--board);
  border-color: rgba(53, 224, 190, 0.38);
}

.page-about .ver-node > summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .ver-node > summary::-webkit-details-marker {
  display: none;
}

.page-about .ver-node > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-num);
  font-size: 18px;
  line-height: 1;
  color: var(--mute);
  transition: color var(--dur) var(--ease);
}

.page-about .ver-node[open] > summary::after {
  content: "–";
  color: var(--teal);
}

.page-about .ver-node > summary:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: -3px;
}

.page-about .ver-num {
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--teal);
  min-width: 2.6em;
}

.page-about .ver-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--chalk);
}

.page-about .ver-body {
  padding: 0 16px 16px;
  border-top: 1px dashed var(--line);
}

.page-about .ver-text {
  margin: 14px 0 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.72;
  color: var(--chalk);
}

@media (min-width: 900px) {
  .page-about .ver-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 30px;
    align-items: start;
  }
}

/* ---------- 反馈筛选 ---------- */
.page-about .fb-bar {
  margin-top: 2px;
}

.page-about .fb-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .fb-item {
  padding: 16px 18px;
  background: var(--board);
  border: 1px solid var(--line);
  border-left: 3px solid rgba(53, 224, 190, 0.55);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .fb-item:hover {
  border-left-color: var(--teal);
  transform: translateX(2px);
}

.page-about .fb-text {
  margin: 10px 0 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.72;
  color: var(--chalk);
}

.page-about .fb-list .fb-item.is-filtered {
  display: none;
}

.page-about .empty-state {
  margin: 0;
}

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

/* ---------- 图片与文字的自适应保护 ---------- */
.page-about .entry img {
  max-width: 100%;
  height: auto;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .crew-card,
  .page-about .fb-item,
  .page-about .flow-dot {
    transition: none;
  }

  .page-about .crew-card:hover,
  .page-about .fb-item:hover {
    transform: none;
  }
}
<<<END>>>