.page-about {
  --pa-rail-w: 320px;
  --pa-rule: rgba(43, 33, 25, 0.16);
  --pa-muted: rgba(43, 33, 25, 0.66);
  --pa-panel: rgba(43, 33, 25, 0.045);
  background-color: var(--cream);
  color: var(--ink);
  font-family: var(--font-sans);
}

/* ---------- 报头 ---------- */
.page-about .pa-masthead {
  position: relative;
  padding-top: calc(var(--header-h) + clamp(1.25rem, 4vw, 2.75rem));
  padding-bottom: clamp(2rem, 5vw, 3.5rem);
  border-bottom: 1px solid var(--pa-rule);
}

.page-about .pa-masthead::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -1px;
  width: min(42%, 420px);
  height: 4px;
  background: var(--vermillion);
}

.page-about .bw-crumb {
  margin: 0 0 1.5rem;
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--pa-muted);
}

.page-about .bw-crumb a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--pa-rule);
  padding-bottom: 1px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .bw-crumb a:hover,
.page-about .bw-crumb a:focus-visible {
  color: var(--vermillion);
  border-bottom-color: var(--vermillion);
}

.page-about .bw-crumb__sep {
  margin: 0 0.5rem;
  color: var(--pa-muted);
}

.page-about .bw-crumb__current {
  color: var(--vermillion);
  font-weight: 700;
}

.page-about .pa-masthead__grid {
  display: grid;
  gap: 1.75rem;
}

.page-about .pa-eyebrow {
  margin: 0 0 0.9rem;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.24em;
  color: var(--vermillion);
  text-transform: uppercase;
}

.page-about .pa-h1 {
  margin: 0;
  font-size: clamp(2rem, 6.4vw, 3.75rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.page-about .pa-lede {
  margin: 0;
  font-size: clamp(1rem, 1.3vw, 1.125rem);
  line-height: 1.85;
  color: var(--ink);
}

.page-about .pa-quicklinks {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.6rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .pa-quicklinks a {
  display: inline-block;
  padding: 0.45rem 0.85rem;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ink);
  text-decoration: none;
  border: 1px solid var(--pa-rule);
  background: rgba(227, 214, 190, 0.35);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .pa-quicklinks a:hover,
.page-about .pa-quicklinks a:focus-visible {
  color: var(--cream);
  background: var(--vermillion);
  border-color: var(--vermillion);
}

@media (min-width: 900px) {
  .page-about .pa-masthead__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 3.5rem;
    align-items: end;
  }

  .page-about .pa-masthead__side {
    padding-bottom: 0.35rem;
  }
}

/* ---------- 主体分屏 ---------- */
.page-about .pa-body {
  padding: clamp(2.25rem, 5.5vw, 4.5rem) 0 clamp(2.5rem, 6vw, 5rem);
}

.page-about .pa-layout {
  display: grid;
  gap: 2.75rem;
}

.page-about .pa-rail {
  position: relative;
}

.page-about .pa-rail__vertical {
  margin: 0 0 1rem;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.24em;
  color: var(--vermillion);
}

.page-about .pa-rail__title {
  margin: 0 0 0.75rem;
  font-size: 1.25rem;
  font-weight: 900;
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.page-about .pa-rail__story p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .pa-rail__figure {
  margin: 1.5rem 0 0;
}

.page-about .pa-rail__figure .bw-figure__frame img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.page-about .pa-rail__figure .bw-figure__caption {
  margin-top: 0.6rem;
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--pa-muted);
}

.page-about .pa-rail__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 0.9rem;
  margin: 1.5rem 0 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--pa-rule);
}

.page-about .pa-rail__stat dt {
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--pa-muted);
}

.page-about .pa-rail__stat dd {
  margin: 0.3rem 0 0;
  font-family: var(--font-mono);
  font-size: 1.375rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--vermillion);
}

@media (min-width: 1024px) {
  .page-about .pa-layout {
    grid-template-columns: var(--pa-rail-w) minmax(0, 1fr);
    gap: 5rem;
    align-items: start;
  }

  .page-about .pa-rail {
    position: sticky;
    top: calc(var(--header-h) + 1.25rem);
    max-height: calc(100vh - var(--header-h) - 2.5rem);
    overflow-y: auto;
    padding-right: 0.5rem;
    scrollbar-width: thin;
  }

  .page-about .pa-rail__vertical {
    position: absolute;
    left: -2.5rem;
    top: 0.1rem;
    margin: 0;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    letter-spacing: 0.38em;
  }

  .page-about .pa-rail__story {
    padding-top: 0.15rem;
  }
}

/* ---------- 右栏章节 ---------- */
.page-about .pa-sec {
  padding-top: clamp(1.75rem, 3.5vw, 2.5rem);
  border-top: 1px solid var(--pa-rule);
  margin-top: clamp(2rem, 4vw, 3rem);
}

.page-about .pa-sec:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.page-about .pa-sec__index {
  margin: 0 0 0.6rem;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--vermillion);
  font-family: var(--font-mono);
}

.page-about .pa-sec__title {
  margin: 0 0 1.1rem;
  font-size: clamp(1.5rem, 3.2vw, 2rem);
  font-weight: 900;
  line-height: 1.24;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .pa-sec__lead {
  margin: 0 0 1rem;
  font-size: 1.0625rem;
  line-height: 1.85;
  font-weight: 500;
  color: var(--ink);
}

.page-about .pa-sec p {
  margin: 0 0 1rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .pa-sec p:last-child {
  margin-bottom: 0;
}

/* 旁注框 */
.page-about .pa-callout {
  margin: 1.75rem 0 0;
  padding: 1.25rem 1.25rem 1.25rem 1.4rem;
  border-left: 3px solid var(--vermillion);
  background: var(--pa-panel);
}

.page-about .pa-callout__label {
  margin: 0 0 0.5rem !important;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--vermillion);
}

.page-about .pa-callout p {
  margin: 0;
  font-size: 0.9375rem !important;
  line-height: 1.85;
}

/* 数据条 */
.page-about .pa-databar {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 1.75rem 0;
  padding: 0;
  background: var(--pa-rule);
  border: 1px solid var(--pa-rule);
}

.page-about .pa-databar .bw-data-bar__cell {
  background: var(--cream);
  padding: 1rem 0.9rem 1.1rem;
}

.page-about .pa-databar .bw-stat {
  display: block;
}

.page-about .pa-databar .bw-stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3.4vw, 1.9rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--vermillion);
}

.page-about .pa-databar .bw-stat__value--orange {
  color: var(--ink);
}

.page-about .pa-databar .bw-stat__label {
  display: block;
  margin-top: 0.45rem;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--pa-muted);
}

@media (min-width: 640px) {
  .page-about .pa-databar {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* 编辑部结构 */
.page-about .pa-org {
  display: grid;
  gap: 1rem;
  margin: 1.75rem 0;
}

.page-about .pa-org__node {
  padding: 1.1rem 1rem 1.25rem;
  border: 1px solid var(--pa-rule);
  border-top: 3px solid var(--ink);
  background: transparent;
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-about .pa-org__node:hover,
.page-about .pa-org__node:focus-within {
  transform: translateY(-3px);
  border-top-color: var(--vermillion);
  background: var(--pa-panel);
}

.page-about .pa-org__tag {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-about .pa-org__desc {
  margin: 0.6rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .pa-org__meta {
  margin: 0.9rem 0 0;
  padding-top: 0.7rem;
  border-top: 1px dashed var(--pa-rule);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--vermillion);
}

@media (min-width: 760px) {
  .page-about .pa-org {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }
}

/* 时间线 */
.page-about .pa-timeline {
  position: relative;
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .pa-timeline__item {
  position: relative;
  padding-left: 1.9rem;
  padding-bottom: 1.1rem;
}

.page-about .pa-timeline__item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 1.35rem;
  bottom: 0;
  width: 1px;
  background: var(--pa-rule);
}

.page-about .pa-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .pa-timeline__item:last-child::before {
  display: none;
}

.page-about .pa-timeline__item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 1.15rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--cream);
  border: 2px solid var(--vermillion);
  box-sizing: border-box;
  transition: background-color 0.2s var(--ease);
}

.page-about .pa-timeline__item:has(details[open])::after {
  background: var(--vermillion);
}

.page-about .pa-stage__head {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.4rem 0;
  cursor: pointer;
  list-style: none;
}

.page-about .pa-stage__head::-webkit-details-marker {
  display: none;
}

.page-about .pa-stage__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.125rem;
  line-height: 1;
  color: var(--pa-muted);
}

.page-about .pa-stage[open] .pa-stage__head::after {
  content: "\2212";
  color: var(--vermillion);
}

.page-about .pa-stage__year {
  flex: 0 0 auto;
  min-width: 3.75rem;
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--vermillion);
}

.page-about .pa-stage__name {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .pa-stage__body {
  padding: 0.25rem 0 0.5rem 4.5rem;
}

.page-about .pa-stage__body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .pa-stage__head:hover .pa-stage__name,
.page-about .pa-stage__head:focus-visible .pa-stage__name {
  color: var(--vermillion);
}

.page-about .pa-stage-figure {
  max-width: min(100%, 400px);
  margin: 2rem 0 0;
}

.page-about .pa-stage-figure .bw-figure__frame img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.page-about .pa-stage-figure .bw-figure__caption {
  margin-top: 0.65rem;
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--pa-muted);
}

/* 天津段落 */
.page-about .pa-split {
  display: grid;
  gap: 1.5rem;
  margin-top: 0.5rem;
}

.page-about .pa-split__text p {
  margin: 0 0 1rem;
}

.page-about .pa-split__figure {
  margin: 0;
}

.page-about .pa-split__figure .bw-figure__frame img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.page-about .pa-split__figure .bw-figure__caption {
  margin-top: 0.65rem;
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--pa-muted);
}

@media (min-width: 900px) {
  .page-about .pa-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 2.5rem;
    align-items: start;
  }

  .page-about .pa-split__figure {
    margin-top: 0.35rem;
  }
}

/* 合作方 */
.page-about .pa-collab {
  margin: 1.5rem 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--pa-rule);
}

.page-about .pa-collab li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.35rem 0.9rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--pa-rule);
  transition: background-color 0.25s var(--ease);
}

.page-about .pa-collab li:hover {
  background: var(--pa-panel);
}

.page-about .pa-collab__num {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--vermillion);
  padding-top: 0.15rem;
}

.page-about .pa-collab__name {
  font-size: 1rem;
  font-weight: 900;
  color: var(--ink);
}

.page-about .pa-collab__desc {
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--ink);
}

@media (min-width: 720px) {
  .page-about .pa-collab li {
    grid-template-columns: 3.5rem 12rem minmax(0, 1fr);
    align-items: baseline;
    gap: 1.25rem;
  }

  .page-about .pa-collab__num {
    grid-row: auto;
    padding-top: 0;
  }
}

/* ---------- 收尾 ---------- */
.page-about .pa-cta {
  padding: 0 0 clamp(3rem, 7vw, 5rem);
}

.page-about .pa-cta__panel {
  position: relative;
  overflow: hidden;
  background: var(--night);
  color: var(--mist);
  padding: clamp(1.75rem, 4.5vw, 3.25rem);
}

.page-about .pa-cta__panel::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--lime) 0%, var(--orange) 68%, var(--vermillion) 100%);
}

.page-about .pa-cta__note {
  margin: 0 0 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.26em;
  color: var(--lime);
}

.page-about .pa-cta__title {
  margin: 0 0 1rem;
  font-size: clamp(1.4rem, 3.4vw, 2.125rem);
  font-weight: 900;
  line-height: 1.24;
  letter-spacing: -0.02em;
  color: var(--mist);
}

.page-about .pa-cta__text {
  margin: 0;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(230, 238, 255, 0.82);
}

.page-about .pa-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.page-about .pa-cta__actions .bw-btn--ghost {
  color: var(--mist);
  border-color: rgba(230, 238, 255, 0.38);
  background: transparent;
}

.page-about .pa-cta__actions .bw-btn--ghost:hover,
.page-about .pa-cta__actions .bw-btn--ghost:focus-visible {
  color: var(--night);
  background: var(--mist);
  border-color: var(--mist);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .pa-org__node,
  .page-about .pa-quicklinks a,
  .page-about .bw-crumb a {
    transition: none;
  }

  .page-about .pa-org__node:hover,
  .page-about .pa-org__node:focus-within {
    transform: none;
  }
}