.page-about {
  --about-rail: 112px;
  --about-measure: 44rem;
  --about-line: rgba(140, 151, 184, .16);
  padding-bottom: clamp(56px, 9vw, 128px);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  margin-top: clamp(18px, 3vw, 32px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: clamp(14px, 2.4vw, 26px);
  padding: clamp(30px, 6vw, 78px) 0 clamp(28px, 4.6vw, 56px);
  border-bottom: 1px solid var(--about-line);
  background:
    radial-gradient(118% 88% at 90% 0%, rgba(53, 224, 200, .13), transparent 58%),
    radial-gradient(88% 76% at 4% 100%, rgba(255, 122, 41, .09), transparent 62%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), rgba(53, 224, 200, 0) 62%);
  opacity: .6;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.04;
  font-size: clamp(1.95rem, 6.6vw, 4rem);
  max-width: 18ch;
  margin: 10px 0 0;
}

.page-about .about-hero__lede {
  margin: clamp(16px, 2.6vw, 26px) 0 0;
  max-width: 60ch;
  color: var(--paper);
  opacity: .84;
}

.page-about .about-hero__marks {
  list-style: none;
  margin: clamp(20px, 3.4vw, 34px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
}

/* ---------- 主体双栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  padding-top: clamp(34px, 6vw, 76px);
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(38px, 5.4vw, 84px);
  }
}

/* ---------- 年份轴 ---------- */
.page-about .about-axis {
  display: none;
}

@media (min-width: 960px) {
  .page-about .about-axis {
    display: block;
    position: sticky;
    top: calc(var(--head-offset) + 20px);
    align-self: start;
  }
}

.page-about .about-axis__label {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-axis__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-axis__list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, rgba(53, 224, 200, .55), rgba(140, 151, 184, .18));
}

.page-about .about-axis__item a {
  position: relative;
  display: block;
  padding: 8px 0 8px 24px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  letter-spacing: .04em;
  color: var(--muted);
  text-decoration: none;
  transition: color .18s var(--ease);
}

.page-about .about-axis__item a::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 50%;
  width: 9px;
  height: 9px;
  margin-top: -4.5px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--muted);
  transition: background .18s var(--ease), border-color .18s var(--ease), box-shadow .18s var(--ease);
}

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

.page-about .about-axis__item a:hover::before,
.page-about .about-axis__item a:focus-visible::before {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 224, 200, .18);
}

/* ---------- 章节 ---------- */
.page-about .about-read {
  min-width: 0;
}

.page-about .chapter {
  padding: clamp(32px, 5.4vw, 62px) 0;
  border-top: 1px solid var(--about-line);
}

.page-about .chapter:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .chapter__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: clamp(16px, 2.6vw, 24px);
}

.page-about .chapter__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan);
  flex: none;
}

.page-about .chapter__title {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.16;
  font-size: clamp(1.35rem, 3.6vw, 2.05rem);
  margin: 0;
  color: var(--paper);
}

.page-about .chapter__text p {
  max-width: var(--about-measure);
  margin: 0 0 1.05em;
  line-height: 1.78;
  color: rgba(233, 238, 248, .82);
}

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

.page-about .chapter__text--after {
  margin-top: clamp(18px, 3vw, 28px);
}

/* ---------- 带图章节 ---------- */
.page-about .chapter--with-media {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 34px);
}

@media (min-width: 760px) {
  .page-about .chapter--with-media {
    grid-template-columns: minmax(0, 1fr) 212px;
    align-items: start;
    gap: clamp(26px, 3vw, 40px);
  }

  .page-about .chapter--media-wide {
    grid-template-columns: minmax(0, 1fr);
  }
}

.page-about .chapter__figure {
  margin: 0;
}

.page-about .chapter__figure--lead {
  margin-bottom: clamp(20px, 3vw, 30px);
}

/* ---------- 等宽统计条 ---------- */
.page-about .statline {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 44px) 0;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  background: var(--about-line);
  overflow: hidden;
}

@media (min-width: 1180px) {
  .page-about .statline--wide {
    margin-right: -32px;
  }
}

.page-about .statline__cell {
  padding: 18px 20px 20px;
  background: linear-gradient(180deg, rgba(22, 32, 74, .92), rgba(10, 16, 48, .82));
}

.page-about .statline__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 4.2vw, 2.3rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .statline__label {
  display: block;
  margin-top: 9px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 伤停三级来源 ---------- */
.page-about .sources {
  list-style: none;
  margin: clamp(22px, 3.6vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  max-width: var(--about-measure);
}

@media (min-width: 720px) {
  .page-about .sources {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .sources__item {
  padding: 18px 18px 20px;
  border: 1px solid rgba(140, 151, 184, .2);
  border-radius: var(--radius-sm);
  background: rgba(22, 32, 74, .5);
}

.page-about .sources__rank {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--cyan);
  border: 1px solid rgba(53, 224, 200, .34);
  border-radius: 999px;
  padding: 2px 9px;
}

.page-about .sources__title {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1rem;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .sources__desc {
  margin: 0;
  font-size: .92rem;
  line-height: 1.72;
  color: rgba(233, 238, 248, .76);
}

/* ---------- 版本时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: clamp(20px, 3.2vw, 32px) 0 0;
  padding: 0;
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 clamp(22px, 3.4vw, 34px) 26px;
  border-left: 1px solid rgba(53, 224, 200, .26);
}

.page-about .timeline__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--cyan);
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .timeline__title {
  margin: 7px 0 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.05rem;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .timeline__desc {
  margin: 0;
  max-width: var(--about-measure);
  font-size: .95rem;
  line-height: 1.72;
  color: rgba(233, 238, 248, .78);
}

/* ---------- 团队折叠面板 ---------- */
.page-about .roles {
  margin-top: clamp(20px, 3.2vw, 30px);
  max-width: var(--about-measure);
  border-top: 1px solid var(--about-line);
}

.page-about .roles details {
  border-bottom: 1px solid var(--about-line);
}

.page-about .roles summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1rem;
  letter-spacing: -.01em;
  color: var(--paper);
}

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

.page-about .roles summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 1.15rem;
  line-height: 1;
  color: var(--cyan);
}

.page-about .roles details[open] summary::after {
  content: "–";
}

.page-about .roles__count {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .roles__body {
  margin: 0;
  padding: 0 0 20px;
  font-size: .93rem;
  line-height: 1.75;
  color: rgba(233, 238, 248, .78);
}

/* ---------- 使用场景 ---------- */
.page-about .scenes {
  list-style: none;
  margin: clamp(22px, 3.6vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

@media (min-width: 720px) {
  .page-about .scenes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .scenes__item {
  padding: 18px 18px 20px;
  border: 1px solid rgba(140, 151, 184, .18);
  border-top: 2px solid var(--cyan);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  background: linear-gradient(180deg, rgba(22, 32, 74, .62), rgba(10, 16, 48, .3));
}

.page-about .scenes__item--green {
  border-top-color: var(--green);
}

.page-about .scenes__item--orange {
  border-top-color: var(--orange);
}

.page-about .scenes__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-about .scenes__title {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.02rem;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .scenes__desc {
  margin: 0;
  font-size: .93rem;
  line-height: 1.72;
  color: rgba(233, 238, 248, .76);
}

/* ---------- 引文段 ---------- */
.page-about .pullquote {
  margin: clamp(30px, 5vw, 56px) 0;
  padding: clamp(26px, 4.4vw, 46px) clamp(22px, 4vw, 44px);
  border-radius: var(--radius);
  background: var(--read);
  color: var(--read-ink);
  box-shadow: var(--shadow);
}

.page-about .pullquote p {
  margin: 0;
  max-width: 34ch;
  font-family: var(--font-serif);
  font-size: clamp(1.12rem, 2.8vw, 1.55rem);
  line-height: 1.62;
  letter-spacing: .01em;
}

/* ---------- 合作与荣誉 ---------- */
.page-about .partners {
  list-style: none;
  margin: clamp(22px, 3.6vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

@media (min-width: 680px) {
  .page-about .partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .partner-card {
  padding: 18px 20px 20px;
  border: 1px solid rgba(140, 151, 184, .2);
  border-radius: var(--radius-sm);
  background: rgba(22, 32, 74, .52);
  transition: border-color .2s var(--ease), transform .2s var(--ease), background .2s var(--ease);
}

.page-about .partner-card:hover,
.page-about .partner-card:focus-within {
  border-color: rgba(53, 224, 200, .5);
  background: rgba(22, 32, 74, .78);
  transform: translateY(-3px);
}

.page-about .partner-card__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--muted);
  transition: color .2s var(--ease);
}

.page-about .partner-card:hover .partner-card__tag,
.page-about .partner-card:focus-within .partner-card__tag {
  color: var(--cyan);
}

.page-about .partner-card__title {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1rem;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .partner-card__desc {
  margin: 0;
  font-size: .92rem;
  line-height: 1.72;
  color: rgba(233, 238, 248, .76);
}

/* ---------- 下一步 ---------- */
.page-about .next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: var(--about-measure);
}

.page-about .next-list__item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 4px 14px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .next-list__item:first-child {
  border-top: 1px solid var(--about-line);
}

.page-about .next-list__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--green);
}

.page-about .next-list__text {
  margin: 0;
  font-size: 1rem;
  line-height: 1.72;
  color: rgba(233, 238, 248, .86);
}

.page-about .next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3.6vw, 34px);
}

/* ---------- 媒体容器补充 ---------- */
.page-about .media__frame {
  max-width: 100%;
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-axis__item a,
  .page-about .about-axis__item a::before,
  .page-about .partner-card,
  .page-about .partner-card__tag {
    transition: none;
  }

  .page-about .partner-card:hover,
  .page-about .partner-card:focus-within {
    transform: none;
  }
}