.page-about {
  --about-card-pad: clamp(1.1rem, 2.4vw, 1.6rem);
  --about-rail: 148px;
  display: block;
}

/* 面包屑 */
.page-about .breadcrumbs {
  padding-block: 1.1rem 0.2rem;
}
.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}
.page-about .breadcrumb-list a {
  color: var(--cyan);
  text-decoration: none;
}
.page-about .breadcrumb-list a:hover {
  text-decoration: underline;
}
.page-about .breadcrumb-list li + li::before {
  content: "/";
  margin-right: 0.4rem;
  color: var(--edge);
}

/* 开场 */
.page-about .about-hero {
  padding-block: clamp(1.2rem, 3.4vw, 2.2rem) clamp(2rem, 5vw, 3.2rem);
}
.page-about .hero-grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.8rem);
}
.page-about .hero-kicker {
  margin: 0 0 0.9rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--amber);
}
.page-about h1 {
  margin: 0 0 1rem;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(1.9rem, 5.4vw, 3rem);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--paper);
}
.page-about .hero-lede {
  margin: 0 0 1rem;
  max-width: 46ch;
  font-size: clamp(1rem, 1.5vw, 1.1rem);
  line-height: 1.78;
  color: var(--ink-light);
}
.page-about .hero-note {
  margin: 0;
  padding-left: 0.9rem;
  max-width: 42ch;
  border-left: 2px solid var(--edge);
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--muted);
}
.page-about .hero-figure {
  margin: 0;
}
.page-about .hero-figure img,
.page-about .shift-figure img,
.page-about .partner-figure img {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .media-caption {
  margin-top: 0.7rem;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--muted);
}

/* 人数条 */
.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: clamp(1.8rem, 4vw, 2.6rem) 0 0;
  border-top: 1px solid var(--edge);
}
.page-about .stat {
  display: flex;
  flex-direction: column-reverse;
  padding: 0.95rem 0.6rem 0.95rem 0;
  border-bottom: 1px solid var(--edge);
}
.page-about .stat-num {
  margin: 0;
  font-family: var(--mono);
  font-size: clamp(1.5rem, 4.2vw, 2.1rem);
  line-height: 1;
  color: var(--cyan);
}
.page-about .stat-key {
  margin: 0.5rem 0 0;
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  color: var(--muted);
}

/* 通用章节 */
.page-about .about-sec {
  padding-block: clamp(2.4rem, 6vw, 4rem);
  border-top: 1px solid var(--edge);
}
.page-about .sec-head {
  max-width: 64ch;
  margin-bottom: clamp(1.4rem, 3vw, 2.2rem);
}
.page-about .sec-num {
  display: block;
  margin: 0 0 0.65rem;
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.22em;
  color: var(--amber);
}
.page-about .sec-title {
  margin: 0 0 0.7rem;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(1.35rem, 3.2vw, 1.9rem);
  line-height: 1.3;
  color: var(--paper);
}
.page-about .sec-lede {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.78;
  color: var(--ink-light);
}
.page-about .mini-title {
  margin: 0 0 1rem;
  font-size: 0.86rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--amber);
}

/* 四组分工 */
.page-about .role-grid {
  display: grid;
  gap: 1px;
  background: var(--edge);
  border: 1px solid var(--edge);
  grid-template-columns: minmax(0, 1fr);
}
.page-about .role-card {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  padding: var(--about-card-pad);
  background: var(--stand);
  transition: background var(--dur) var(--ease);
}
.page-about .role-card:hover {
  background: var(--stand-hi);
}
.page-about .role-card--lead {
  box-shadow: inset 3px 0 0 0 var(--cyan);
}
.page-about .role-count {
  margin: 0;
  font-family: var(--mono);
  font-size: 1.55rem;
  line-height: 1;
  color: var(--cyan);
}
.page-about .role-name {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}
.page-about .role-duty {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.76;
  color: var(--ink-light);
}
.page-about .role-hand {
  margin: auto 0 0;
  padding-top: 0.65rem;
  border-top: 1px solid var(--edge);
  font-size: 0.79rem;
  line-height: 1.6;
  color: var(--muted);
}

/* 奶油引文板 */
.page-about .paper-note {
  margin-block: clamp(1.6rem, 4vw, 2.6rem) 0;
}
.page-about .paper-note-text {
  margin: 0 0 0.9rem;
  padding: clamp(1.4rem, 4vw, 2.4rem);
  background: var(--paper);
  color: var(--ink-dark);
  font-family: var(--serif);
  font-size: clamp(1.05rem, 2.4vw, 1.35rem);
  font-weight: 700;
  line-height: 1.6;
  border-left: 4px solid var(--orange);
}
.page-about .paper-note-src {
  margin: 0;
  padding-left: 0.2rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--muted);
}

/* 班次 */
.page-about .table-scroll {
  overflow-x: auto;
  margin-bottom: clamp(1.4rem, 3vw, 2rem);
}
.page-about .shift-table {
  width: 100%;
  min-width: 420px;
  border-collapse: collapse;
}
.page-about .shift-table caption {
  padding-bottom: 0.8rem;
  text-align: left;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.page-about .shift-table th,
.page-about .shift-table td {
  padding: 0.85rem 0.7rem;
  border-bottom: 1px solid var(--edge);
  text-align: left;
  vertical-align: top;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--ink-light);
}
.page-about .shift-table thead th {
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--amber);
}
.page-about .shift-table tbody th {
  color: var(--paper);
  font-weight: 700;
  white-space: nowrap;
}
.page-about .t {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .shift-cards {
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(0, 1fr);
}
.page-about .shift-card {
  padding: var(--about-card-pad);
  background: var(--stand);
  border: 1px solid var(--edge);
}
.page-about .shift-name {
  margin: 0 0 0.5rem;
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--paper);
}
.page-about .shift-time {
  margin: 0 0 0.7rem;
  font-size: 0.86rem;
  color: var(--ink-light);
}
.page-about .shift-desc {
  margin: 0 0 0.9rem;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--ink-light);
}
.page-about .panel-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0;
  border: 0;
  border-bottom: 1px solid var(--edge);
  background: none;
  font-family: var(--sans);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--cyan);
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.page-about .panel-trigger:hover {
  border-color: var(--cyan);
}
.page-about .panel-inner p {
  margin: 0.8rem 0 0;
  font-size: 0.89rem;
  line-height: 1.75;
  color: var(--ink-light);
}

/* 四步流程 */
.page-about .flow-block {
  margin-top: clamp(1.8rem, 4vw, 2.6rem);
}
.page-about .steps {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--edge);
  border: 1px solid var(--edge);
  grid-template-columns: minmax(0, 1fr);
}
.page-about .step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.2rem 0.9rem;
  padding: 0.95rem var(--about-card-pad);
  background: var(--night);
}
.page-about .step-i {
  grid-row: 1 / span 2;
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--amber);
}
.page-about .step-t {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--paper);
}
.page-about .step-d {
  font-size: 0.85rem;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .shift-figure {
  margin: clamp(1.6rem, 4vw, 2.4rem) 0 0;
}

/* 版本时间线 */
.page-about .timeline {
  display: grid;
  gap: clamp(1.4rem, 4vw, 2.4rem);
}
.page-about .tl-rail-list {
  display: flex;
  gap: 1.4rem;
  margin: 0;
  padding: 0.9rem 0 0;
  list-style: none;
  border-top: 1px solid var(--edge);
}
.page-about .tl-node a {
  position: relative;
  display: inline-block;
  padding-left: 1rem;
  font-family: var(--mono);
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  color: var(--muted);
  transition: color var(--dur) var(--ease);
}
.page-about .tl-node a::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  width: 7px;
  height: 7px;
  margin-top: -3.5px;
  border: 1px solid var(--edge);
  border-radius: 50%;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .tl-node a:hover,
.page-about .tl-node a:focus-visible {
  color: var(--cyan);
}
.page-about .tl-node a:hover::before,
.page-about .tl-node a:focus-visible::before {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .tl-entries {
  display: grid;
  gap: clamp(1rem, 2.6vw, 1.6rem);
}
.page-about .tl-entry {
  padding: clamp(1.2rem, 3vw, 1.9rem);
  background: var(--paper);
  color: var(--ink-dark);
  border-top: 3px solid var(--orange);
  scroll-margin-top: 7rem;
}
.page-about .tl-entry:target {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}
.page-about .entry-year {
  margin: 0 0 0.45rem;
  font-family: var(--mono);
  font-size: clamp(1.5rem, 4vw, 1.9rem);
  line-height: 1;
  color: var(--edge);
}
.page-about .entry-title {
  margin: 0 0 0.75rem;
  font-family: var(--serif);
  font-size: clamp(1.05rem, 2.4vw, 1.2rem);
  line-height: 1.42;
  color: var(--ink-dark);
}
.page-about .entry-body {
  margin: 0 0 0.8rem;
  font-size: 0.92rem;
  line-height: 1.82;
  color: var(--ink-dark);
}
.page-about .entry-list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .entry-list li {
  position: relative;
  padding-left: 1.1rem;
  margin-bottom: 0.35rem;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--ink-dark);
}
.page-about .entry-list li::before {
  content: "";
  position: absolute;
  top: 0.62em;
  left: 0;
  width: 8px;
  height: 2px;
  background: var(--orange);
}

/* 协作流程 */
.page-about .flow {
  display: grid;
  gap: 0.3rem;
  margin-bottom: clamp(1.6rem, 4vw, 2.4rem);
}
.page-about .flow-node {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 0.9rem 1.05rem;
  background: var(--stand);
  border: 1px solid var(--edge);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.page-about .flow-node:hover {
  background: var(--stand-hi);
  border-color: var(--cyan);
}
.page-about .flow-role {
  font-size: 0.94rem;
  font-weight: 700;
  color: var(--paper);
}
.page-about .flow-fn {
  font-size: 0.83rem;
  line-height: 1.65;
  color: var(--muted);
}
.page-about .flow-link {
  display: block;
  width: 0;
  height: 18px;
  margin-left: 1.2rem;
  border-left: 3px solid var(--edge);
  transition: border-color var(--dur) var(--ease);
}
.page-about .flow-link--heavy {
  border-left-color: var(--cyan);
  border-left-width: 5px;
}
.page-about .flow-link--mid {
  border-left-color: var(--edge);
  border-left-width: 3px;
}
.page-about .flow-link--light {
  border-left-color: var(--muted);
  border-left-width: 2px;
  border-left-style: dashed;
}
.page-about .flow-node:hover + .flow-link {
  border-color: var(--cyan);
}

.page-about .collab-prose p {
  margin: 0 0 1rem;
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--ink-light);
}
.page-about .collab-prose a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 合作生态 */
.page-about .partner-grid {
  display: grid;
  gap: clamp(1.4rem, 4vw, 2.6rem);
}
.page-about .partner-copy {
  display: grid;
  gap: 1.4rem;
}
.page-about .partner-item {
  padding-left: 1rem;
  border-left: 2px solid var(--edge);
}
.page-about .partner-name {
  margin: 0 0 0.5rem;
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--paper);
}
.page-about .partner-item p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--ink-light);
}
.page-about .partner-figure {
  margin: 0;
}

/* 加入我们 */
.page-about .join-list {
  display: grid;
  gap: 1px;
  margin: 0 0 1.4rem;
  padding: 0;
  list-style: none;
  background: var(--edge);
  border: 1px solid var(--edge);
  grid-template-columns: minmax(0, 1fr);
}
.page-about .join-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 1rem;
  padding: 0.95rem var(--about-card-pad);
  background: var(--night);
}
.page-about .join-role {
  font-size: 0.94rem;
  font-weight: 700;
  color: var(--cyan);
}
.page-about .join-note {
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--ink-light);
}
.page-about .join-tail {
  margin: 0 0 1.4rem;
  max-width: 62ch;
  font-size: 0.93rem;
  line-height: 1.82;
  color: var(--ink-light);
}
.page-about .cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

/* 响应式 */
@media (min-width: 620px) {
  .page-about .role-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .join-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
  .page-about .stat {
    padding-right: 1rem;
  }
  .page-about .shift-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: end;
  }
  .page-about .flow {
    display: flex;
    align-items: stretch;
    gap: 0;
  }
  .page-about .flow-node {
    flex: 1 1 0;
    justify-content: center;
  }
  .page-about .flow-link {
    align-self: center;
    width: 26px;
    height: 0;
    margin: 0;
    border-left: 0;
    border-top: 3px solid var(--edge);
  }
  .page-about .flow-link--heavy {
    border-top-color: var(--cyan);
    border-top-width: 5px;
  }
  .page-about .flow-link--mid {
    border-top-color: var(--edge);
    border-top-width: 3px;
  }
  .page-about .flow-link--light {
    border-top-color: var(--muted);
    border-top-width: 2px;
    border-top-style: dashed;
  }
  .page-about .timeline {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
    gap: clamp(1.6rem, 4vw, 3rem);
  }
  .page-about .tl-rail {
    position: sticky;
    top: 7rem;
  }
  .page-about .tl-rail-list {
    flex-direction: column;
    gap: 1.1rem;
    padding: 0.2rem 0 0.2rem 1.1rem;
    border-top: 0;
    border-left: 1px solid var(--edge);
  }
  .page-about .partner-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    align-items: start;
  }
}

@media (min-width: 1040px) {
  .page-about .role-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .join-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role-card,
  .page-about .flow-node,
  .page-about .flow-link,
  .page-about .panel-trigger,
  .page-about .tl-node a,
  .page-about .tl-node a::before {
    transition: none;
  }
}