.page-about {
  padding-bottom: 88px;
}

/* ---------- 面包屑上下文 ---------- */
.page-about .breadcrumb {
  padding-top: 18px;
}

/* ---------- 首屏：非对称拼贴，左索引右说明 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 26px 0 52px;
  border-bottom: var(--hairline);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(560px 220px at 88% -10%, rgba(139, 92, 246, 0.16), transparent 72%),
    radial-gradient(420px 180px at 12% 110%, rgba(63, 216, 200, 0.08), transparent 70%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: 28px;
}

.page-about .about-hero__index {
  padding-left: 16px;
  border-left: 2px solid var(--violet);
}

.page-about .about-hero__kicker {
  margin: 10px 0 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--mist);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 7.4vw, 62px);
  font-weight: 600;
  line-height: 1.06;
  letter-spacing: 0.03em;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-hero__stats {
  display: grid;
  gap: 0;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--hairline);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 0;
  border-bottom: var(--hairline);
}

.page-about .about-stat__num {
  font-size: clamp(30px, 8vw, 44px);
  line-height: 1;
  color: var(--paper);
  text-shadow: 0 0 14px rgba(139, 92, 246, 0.18);
}

.page-about .about-stat__unit {
  margin-left: 6px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.page-about .about-stat__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 通用章节微调 ---------- */
.page-about .about-origin,
.page-about .about-version,
.page-about .about-rating,
.page-about .about-process,
.page-about .about-taxonomy,
.page-about .about-scale,
.page-about .about-partner,
.page-about .about-next {
  padding-top: 52px;
}

.page-about .about-origin__grid,
.page-about .about-process__grid,
.page-about .about-taxonomy__grid,
.page-about .about-partner__grid {
  display: grid;
  gap: 26px;
  margin-top: 26px;
}

.page-about p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist);
}

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

.page-about a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 216, 200, 0.35);
}

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

.page-about .about-origin__col p {
  border-top: var(--hairline);
  padding-top: 16px;
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-version__grid {
  display: grid;
  gap: 30px;
  margin-top: 28px;
}

.page-about .about-timeline {
  position: relative;
  padding-left: 30px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--line);
}

.page-about .about-node {
  position: relative;
  padding-bottom: 10px;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(63, 216, 200, 0.08);
}

.page-about .about-node--ghost::before {
  border-color: var(--violet);
  box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.1);
}

.page-about .about-node__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 6px 0 12px;
  cursor: pointer;
  list-style: none;
  border-bottom: var(--hairline);
}

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

.page-about .about-node__summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .about-node__ver {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--violet);
}

.page-about .about-node__year {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-about .about-node__title {
  flex: 1 1 60%;
  min-width: 180px;
  font-family: var(--font-display);
  font-size: 17px;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-about .about-node__body {
  padding: 12px 0 20px;
}

.page-about .about-node__body p {
  font-size: 14px;
  color: var(--mist);
}

.page-about .about-node[open] .about-node__title {
  color: var(--paper);
}

/* ---------- 图像容器 ---------- */
.page-about .about-figure {
  margin: 0;
  border: var(--hairline);
  border-radius: var(--radius);
  background: var(--ink-800);
  box-shadow: var(--inset);
  overflow: hidden;
}

.page-about .about-figure__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-bottom: var(--hairline);
}

.page-about .about-figure__cap {
  padding: 10px 14px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 评分维度刻度 ---------- */
.page-about .about-rating__grid {
  display: grid;
  gap: 30px;
  margin-top: 26px;
}

.page-about .about-rating__intro {
  font-size: 15px;
  color: var(--mist);
}

.page-about .about-dims {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--hairline);
}

.page-about .about-dim {
  padding: 16px 0;
  border-bottom: var(--hairline);
}

.page-about .about-dim:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .about-dim__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
}

.page-about .about-dim__name {
  font-size: 15px;
  color: var(--paper);
}

.page-about .about-dim__weight {
  font-size: 17px;
  color: var(--amber);
}

.page-about .about-dim__track {
  margin-top: 9px;
  height: 6px;
  border: var(--hairline);
  border-radius: 2px;
  background: var(--ink-700);
  overflow: hidden;
}

.page-about .about-dim__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, rgba(233, 180, 76, 0.4), var(--amber));
}

.page-about .about-dim__fill--25 { width: 25%; }
.page-about .about-dim__fill--20 { width: 20%; }
.page-about .about-dim__fill--15 { width: 15%; }

.page-about .about-dim__meta {
  margin: 9px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
  opacity: 0.5;
  transition: opacity 160ms var(--ease);
}

.page-about .about-dim:hover .about-dim__meta,
.page-about .about-dim:focus .about-dim__meta {
  opacity: 1;
}

.page-about .about-rating__note {
  margin-top: 20px;
  padding: 16px 18px;
  border-left: 2px solid var(--amber);
  background: var(--ink-800);
  font-size: 14px;
  color: var(--mist);
}

/* ---------- 事实清单 ---------- */
.page-about .about-facts {
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--hairline);
}

.page-about .about-fact {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 14px;
  padding: 16px 0;
  border-bottom: var(--hairline);
}

.page-about .about-fact__index {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--violet);
}

.page-about .about-fact__body {
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-fact__body strong {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--paper);
}

/* ---------- 分类与字段 ---------- */
.page-about .about-taxonomy__fields {
  display: grid;
  gap: 0;
  border-top: var(--hairline);
}

.page-about .about-field {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 4px 14px;
  padding: 15px 0;
  border-bottom: var(--hairline);
}

.page-about .about-field__code {
  grid-row: span 2;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-field__name {
  font-size: 15px;
  color: var(--paper);
}

.page-about .about-field__desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 规模刻度板 ---------- */
.page-about .about-scale {
  display: grid;
  gap: 1px;
  margin-top: 26px;
  border: var(--hairline);
  border-radius: var(--radius);
  background: var(--line);
  overflow: hidden;
}

.page-about .about-scale__cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 18px;
  background: var(--ink-900);
}

.page-about .about-scale__num {
  font-size: clamp(32px, 8vw, 44px);
  line-height: 1;
  color: var(--paper);
}

.page-about .about-scale__num--amber {
  color: var(--amber);
  text-shadow: 0 0 14px rgba(233, 180, 76, 0.2);
}

.page-about .about-scale__unit {
  margin-left: 5px;
  font-size: 13px;
  color: var(--mist);
}

.page-about .about-scale__label {
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-scale__note {
  margin-top: 20px;
  padding-left: 16px;
  border-left: 2px solid var(--cyan);
  font-size: 14px;
}

/* ---------- 合作三通道 ---------- */
.page-about .about-partner__card {
  padding: 20px 18px;
  border: var(--hairline);
  border-top: 2px solid var(--violet);
  border-radius: var(--radius);
  background: var(--ink-800);
  box-shadow: var(--inset);
}

.page-about .about-partner__code {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--violet);
}

.page-about .about-partner__title {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .about-partner__desc {
  font-size: 14px;
  color: var(--mist);
}

/* ---------- 收尾通道 ---------- */
.page-about .about-next__panel {
  display: grid;
  gap: 24px;
  padding: 28px 22px;
  border: var(--hairline);
  border-left: 2px solid var(--cyan);
  border-radius: var(--radius);
  background:
    radial-gradient(520px 180px at 100% 0%, rgba(139, 92, 246, 0.14), transparent 70%),
    var(--ink-800);
}

.page-about .about-next__title {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-size: clamp(22px, 5vw, 32px);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-about .about-next__desc {
  font-size: 14.5px;
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-origin__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 40px;
  }

  .page-about .about-version__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: 44px;
  }

  .page-about .about-rating__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: 44px;
  }

  .page-about .about-process__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: start;
    gap: 40px;
  }

  .page-about .about-facts {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 44px;
  }

  .page-about .about-taxonomy__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: 44px;
  }

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

  .page-about .about-partner__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-next__panel {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
    padding: 34px 30px;
  }

  .page-about .about-next__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1024px) {
  .page-about .about-origin,
  .page-about .about-version,
  .page-about .about-rating,
  .page-about .about-process,
  .page-about .about-taxonomy,
  .page-about .about-scale,
  .page-about .about-partner,
  .page-about .about-next {
    padding-top: 72px;
  }

  .page-about .about-hero {
    padding: 34px 0 66px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 7fr);
    gap: 56px;
  }

  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-top: none;
    border-left: var(--hairline);
  }

  .page-about .about-stat {
    padding: 4px 0 4px 20px;
    border-bottom: none;
    border-right: var(--hairline);
  }

  .page-about .about-stat:last-child {
    border-right: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-dim__meta {
    transition: none;
  }
}