.page-about {
  --about-hair: rgba(241, 233, 221, 0.14);
  --about-cast: rgba(53, 224, 208, 0.34);
  color: var(--text-main);
  background: var(--surface-deep);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(18px, 4vw, 36px) var(--gutter) clamp(44px, 7vw, 88px);
  background:
    radial-gradient(ellipse at 86% 4%, rgba(53, 224, 208, 0.14), transparent 52%),
    radial-gradient(ellipse at 6% 94%, rgba(184, 107, 75, 0.13), transparent 50%),
    linear-gradient(176deg, #06111f 0%, #0b1d31 66%, #0e2137 100%);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-hero__inner,
.page-about .about-body {
  max-width: var(--stage-max);
  margin: 0 auto;
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.04em;
  color: var(--text-faint);
  margin-bottom: clamp(22px, 4vw, 44px);
}

.page-about .breadcrumbs__item a {
  color: var(--text-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}

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

.page-about .breadcrumbs__sep {
  color: rgba(155, 169, 178, 0.5);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: end;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.16em;
  color: var(--c-cyan);
  margin: 0;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(36px, 7.4vw, 80px);
  line-height: 1.02;
  letter-spacing: -0.025em;
  margin: 14px 0 20px;
  text-wrap: balance;
}

.page-about .about-hero h1 em {
  font-style: normal;
  display: block;
  color: var(--c-cyan);
}

.page-about .about-hero__lead {
  font-size: var(--fs-lead);
  line-height: 1.78;
  color: var(--text-dim);
  margin: 0;
  max-width: 56ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 36px;
  list-style: none;
  margin: 30px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.4vw, 26px);
  font-weight: 600;
  color: var(--c-cyan);
  letter-spacing: -0.02em;
}

.page-about .about-fact__label {
  font-size: var(--fs-micro);
  color: var(--text-faint);
  letter-spacing: 0.05em;
}

.page-about .media-frame {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-l);
  border: 1px solid var(--about-hair);
  background: var(--surface-panel);
  box-shadow: var(--shadow-panel);
}

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

.page-about .about-hero__figure img {
  aspect-ratio: 3 / 2;
}

.page-about .media-frame__caption {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  line-height: 1.6;
  color: var(--text-faint);
  padding: 12px 16px;
  border-top: 1px solid var(--about-hair);
  background: rgba(6, 17, 31, 0.5);
}

/* ---------- 正文骨架 ---------- */
.page-about .about-body {
  padding: clamp(36px, 6vw, 76px) var(--gutter) clamp(48px, 8vw, 100px);
  display: grid;
  gap: clamp(28px, 4vw, 40px);
}

.page-about .about-index__label {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.18em;
  color: var(--text-faint);
  margin: 0 0 10px;
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0 0 8px;
  overflow-x: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--about-cast) transparent;
}

.page-about .about-index__list li {
  flex: 0 0 auto;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 14px;
  white-space: nowrap;
  font-size: var(--fs-small);
  color: var(--text-dim);
  text-decoration: none;
  border: 1px solid var(--about-hair);
  border-radius: 999px;
  background: rgba(241, 233, 221, 0.03);
  transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--c-cyan);
  border-color: var(--about-cast);
  outline: none;
}

.page-about .about-index__list a:focus-visible {
  box-shadow: 0 0 0 2px rgba(53, 224, 208, 0.35);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-cyan);
  letter-spacing: 0.08em;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding: clamp(30px, 5vw, 56px) 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-chapter__head {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 18px;
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(42px, 8vw, 76px);
  font-weight: 600;
  line-height: 0.9;
  letter-spacing: -0.05em;
  color: rgba(241, 233, 221, 0.13);
}

.page-about .about-chapter h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4.2vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.015em;
  margin: 0;
  text-wrap: balance;
}

.page-about .about-chapter__body p {
  font-size: var(--fs-body);
  line-height: 1.82;
  color: var(--text-dim);
  margin: 0 0 16px;
  max-width: 62ch;
}

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

.page-about .about-chapter__body a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--about-cast);
}

.page-about .about-chapter__body a:hover,
.page-about .about-chapter__body a:focus-visible {
  color: var(--c-bone);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  display: flex;
  gap: 14px;
  list-style: none;
  margin: 26px 0 0;
  padding: 20px 4px 18px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  border-top: 1px solid var(--about-hair);
  scrollbar-width: thin;
  scrollbar-color: var(--about-cast) transparent;
}

.page-about .about-timeline:focus-visible {
  outline: 2px solid rgba(53, 224, 208, 0.5);
  outline-offset: 4px;
}

.page-about .about-timeline__item {
  position: relative;
  flex: 0 0 min(76vw, 268px);
  scroll-snap-align: start;
  padding: 22px 18px 18px;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-m);
  background: linear-gradient(168deg, rgba(14, 33, 55, 0.92), rgba(11, 29, 49, 0.72));
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 20px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-cyan);
  box-shadow: 0 0 0 4px rgba(53, 224, 208, 0.14);
}

.page-about .about-timeline__item--now {
  border-color: rgba(255, 155, 74, 0.5);
  background: linear-gradient(168deg, rgba(46, 60, 67, 0.62), rgba(11, 29, 49, 0.8));
}

.page-about .about-timeline__item--now::before {
  background: var(--c-orange);
  box-shadow: 0 0 0 4px rgba(255, 155, 74, 0.16);
}

.page-about .about-timeline__ver {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.08em;
  color: var(--c-cyan);
  margin-bottom: 10px;
}

.page-about .about-timeline__item--now .about-timeline__ver {
  color: var(--c-orange);
}

.page-about .about-timeline__item h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.35;
  margin: 0 0 8px;
  color: var(--c-bone);
}

.page-about .about-timeline__item p {
  font-size: var(--fs-small);
  line-height: 1.72;
  color: var(--text-dim);
  margin: 0;
}

.page-about .about-version-figure {
  margin-top: 26px;
}

.page-about .about-version-figure img {
  aspect-ratio: 12 / 7;
}

/* ---------- 数据维护 ---------- */
.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 26px 0;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-metric {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 16px;
  background: var(--surface-panel);
}

.page-about .about-metric__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 4vw, 30px);
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--c-cyan);
}

.page-about .about-metric__label {
  font-size: var(--fs-micro);
  color: var(--text-faint);
  letter-spacing: 0.05em;
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-steps__item {
  position: relative;
  padding: 18px 18px 18px 42px;
  border-left: 2px solid rgba(101, 122, 94, 0.7);
  background: rgba(241, 233, 221, 0.03);
  border-radius: 0 var(--radius-m) var(--radius-m) 0;
}

.page-about .about-steps__marker {
  position: absolute;
  left: 12px;
  top: 24px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-moss);
  box-shadow: 0 0 0 4px rgba(101, 122, 94, 0.18);
}

.page-about .about-steps__item h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  margin: 0 0 8px;
  color: var(--c-bone);
}

.page-about .about-steps__item p {
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--text-dim);
  margin: 0;
}

/* ---------- 团队 ---------- */
.page-about .about-team-list {
  margin-top: 22px;
  display: grid;
  gap: 10px;
}

.page-about .about-team {
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-m);
  background: rgba(241, 233, 221, 0.035);
  padding: 0 18px;
  transition: border-color var(--dur-fast) var(--ease-out);
}

.page-about .about-team[open] {
  border-color: var(--about-cast);
  background: rgba(14, 33, 55, 0.72);
}

.page-about .about-team__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  border-radius: var(--radius-s);
}

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

.page-about .about-team__summary:focus-visible {
  outline: 2px solid rgba(53, 224, 208, 0.5);
  outline-offset: 3px;
}

.page-about .about-team__count {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  color: var(--c-cyan);
  min-width: 2.2ch;
}

.page-about .about-team__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--c-bone);
}

.page-about .about-team__hint {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--text-faint);
  letter-spacing: 0.1em;
}

.page-about .about-team[open] .about-team__hint {
  color: var(--c-cyan);
}

.page-about .about-team__body {
  padding: 0 0 18px;
}

.page-about .about-team__body p {
  font-size: var(--fs-small);
  line-height: 1.8;
  color: var(--text-dim);
  margin: 0;
}

/* ---------- 合作机制 ---------- */
.page-about .about-mechanisms {
  display: grid;
  gap: 14px;
  margin: 24px 0 20px;
}

.page-about .about-mechanism {
  padding: 20px 18px;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-m);
  background: linear-gradient(160deg, rgba(46, 60, 67, 0.34), rgba(11, 29, 49, 0.6));
}

.page-about .about-mechanism h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  margin: 12px 0 8px;
  color: var(--c-bone);
}

.page-about .about-mechanism p {
  font-size: var(--fs-small);
  line-height: 1.76;
  color: var(--text-dim);
  margin: 0;
}

.page-about .tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  padding: 4px 10px;
  border-radius: 999px;
  display: inline-block;
  border: 1px solid transparent;
}

.page-about .tag--cyan {
  color: var(--c-cyan);
  border-color: rgba(53, 224, 208, 0.42);
  background: rgba(53, 224, 208, 0.09);
}

.page-about .tag--moss {
  color: #b7c8ae;
  border-color: rgba(101, 122, 94, 0.66);
  background: rgba(101, 122, 94, 0.18);
}

.page-about .tag--orange {
  color: var(--c-orange);
  border-color: rgba(255, 155, 74, 0.46);
  background: rgba(255, 155, 74, 0.1);
}

.page-about .about-partners__tail {
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--text-dim);
  margin: 0;
}

/* ---------- 江岸 ---------- */
.page-about .about-chongqing-figure {
  margin-top: 24px;
  border-radius: var(--radius-m);
}

.page-about .about-chongqing-figure img {
  aspect-ratio: 10 / 7;
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  margin-top: clamp(30px, 5vw, 56px);
  padding: clamp(26px, 4vw, 40px);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-l);
  background:
    linear-gradient(140deg, rgba(184, 107, 75, 0.16), rgba(6, 17, 31, 0.4) 58%),
    var(--surface-panel);
}

.page-about .about-cta__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 3.4vw, 30px);
  letter-spacing: -0.01em;
  margin: 0 0 20px;
}

.page-about .about-cta__links {
  display: grid;
  gap: 10px;
}

.page-about .about-cta__link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  text-decoration: none;
  color: var(--text-main);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-m);
  background: rgba(6, 17, 31, 0.42);
  transition: border-color var(--dur-fast) var(--ease-out), transform var(--dur-mid) var(--ease-out);
}

.page-about .about-cta__link:hover,
.page-about .about-cta__link:focus-visible {
  border-color: var(--about-cast);
  transform: translateY(-2px);
  outline: none;
}

.page-about .about-cta__link:focus-visible {
  box-shadow: 0 0 0 2px rgba(53, 224, 208, 0.35);
}

.page-about .about-cta__link-kicker {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.12em;
  color: var(--c-cyan);
}

.page-about .about-cta__link-text {
  font-size: var(--fs-small);
  color: var(--text-dim);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-timeline__item {
    flex: 0 0 288px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 186px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 120px;
  }

  .page-about .about-index__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__list a {
    width: 100%;
    justify-content: flex-start;
    border-radius: var(--radius-s);
    border-color: transparent;
    background: transparent;
    padding: 9px 10px;
  }

  .page-about .about-index__list a:hover,
  .page-about .about-index__list a:focus-visible {
    background: rgba(241, 233, 221, 0.05);
    border-color: var(--about-hair);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-cta__link,
  .page-about .about-team,
  .page-about .about-index__list a {
    transition: none;
  }

  .page-about .about-cta__link:hover,
  .page-about .about-cta__link:focus-visible {
    transform: none;
  }
}