.page-about {
  --about-rail: 232px;
  --about-line: rgba(18, 26, 36, 0.14);
  --about-line-light: rgba(154, 163, 173, 0.24);
  --about-body: #26313d;
  background: var(--paper);
  color: var(--ink-black);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

/* ---------- 首屏框景 ---------- */

.page-about .about-hero {
  position: relative;
  background: var(--ink-navy);
  color: var(--paper);
  padding: 26px 0 44px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(154, 163, 173, 0.09) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(154, 163, 173, 0.09) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
}

.page-about .about-hero__frame {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 24px var(--pad) 38px;
  border: 1px solid var(--gold-dim);
}

.page-about .about-hero__frame > .frame__corner {
  position: absolute;
  width: 18px;
  height: 18px;
  border: 0 solid var(--gold);
  pointer-events: none;
}

.page-about .frame__corner--tl {
  top: -1px;
  left: -1px;
  border-top-width: 2px;
  border-left-width: 2px;
}

.page-about .frame__corner--tr {
  top: -1px;
  right: -1px;
  border-top-width: 2px;
  border-right-width: 2px;
}

.page-about .frame__corner--bl {
  bottom: -1px;
  left: -1px;
  border-bottom-width: 2px;
  border-left-width: 2px;
}

.page-about .frame__corner--br {
  bottom: -1px;
  right: -1px;
  border-bottom-width: 2px;
  border-right-width: 2px;
}

.page-about .breadcrumb {
  margin: 0 0 22px;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
}

.page-about .breadcrumb__link {
  color: var(--gold-soft);
  text-decoration: none;
}

.page-about .breadcrumb__link:hover {
  text-decoration: underline;
}

.page-about .breadcrumb__sep {
  color: var(--stone);
}

.page-about .breadcrumb__item {
  color: var(--stone);
}

.page-about .about-hero__kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--celadon);
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 22ch;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(28px, 6.6vw, 58px);
  line-height: 1.22;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 239, 228, 0.8);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 32px 0 0;
  padding: 0;
  background: var(--about-line-light);
  border: 1px solid var(--about-line-light);
}

.page-about .about-figures__cell {
  background: var(--ink-navy);
  padding: 14px 14px 16px;
}

.page-about .about-figures__num {
  display: block;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: 0.02em;
  color: var(--gold);
}

.page-about .about-figures__label {
  display: block;
  margin: 6px 0 0;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--stone);
}

/* ---------- 文档双栏 ---------- */

.page-about .about-doc {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 32px var(--pad) 56px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .about-rail {
  min-width: 0;
}

.page-about .index-rail {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 2px 0 10px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .index-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  padding: 9px 13px;
  border: 1px solid var(--about-line);
  background: rgba(255, 255, 255, 0.55);
  color: var(--ink-black);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: background 180ms ease, color 180ms ease, border-color 180ms ease;
}

.page-about .index-rail__link:hover {
  border-color: var(--gold);
}

.page-about .index-rail__link.is-active {
  background: var(--ink-navy);
  border-color: var(--ink-navy);
  color: var(--gold-soft);
}

.page-about .index-rail__num {
  color: var(--celadon-deep);
}

.page-about .index-rail__link.is-active .index-rail__num {
  color: var(--celadon);
}

.page-about .about-column {
  min-width: 0;
}

/* ---------- 章节通用 ---------- */

.page-about .about-section {
  padding: 28px 0 32px;
  border-top: 1px solid var(--about-line);
}

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

.page-about .about-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--celadon-deep);
}

.page-about .about-eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--gold);
}

.page-about .about-h2 {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(22px, 4.4vw, 33px);
  line-height: 1.32;
  letter-spacing: 0.01em;
  color: var(--ink-black);
}

.page-about .about-h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 17px;
  line-height: 1.45;
  color: var(--ink-black);
}

.page-about .about-p {
  margin: 0 0 14px;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-body);
}

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

.page-about .about-p--note {
  margin-top: 18px;
  padding-left: 14px;
  border-left: 2px solid var(--terracotta);
  font-size: 14px;
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: 20px 0 22px;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--about-line-light);
  background: var(--panel-navy);
}

.page-about .about-figure__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.7;
  letter-spacing: 0.03em;
  color: var(--stone);
}

.page-about .about-figure--inverse img {
  border-color: rgba(154, 163, 173, 0.34);
}

.page-about .about-figure--inverse .about-figure__caption {
  color: rgba(154, 163, 173, 0.9);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  position: relative;
  margin-top: 24px;
  padding-left: 28px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--celadon) 62%, rgba(127, 169, 155, 0.16) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 26px;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 4px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 5px;
  width: 10px;
  height: 10px;
  background: var(--paper);
  border: 2px solid var(--gold);
  transform: rotate(45deg);
}

.page-about .about-timeline__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 6px;
}

.page-about .about-timeline__ver {
  display: inline-block;
  padding: 3px 9px;
  border: 1px solid var(--gold);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--ink-black);
  background: rgba(212, 175, 55, 0.12);
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--celadon-deep);
}

.page-about .about-timeline__more {
  margin-top: 10px;
  padding-left: 12px;
  border-left: 2px solid rgba(127, 169, 155, 0.42);
}

.page-about .about-timeline__more > summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--celadon-deep);
}

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

.page-about .about-timeline__more > summary::before {
  content: "＋ ";
  color: var(--terracotta);
}

.page-about .about-timeline__more[open] > summary::before {
  content: "－ ";
}

.page-about .about-timeline__more > summary:hover {
  color: var(--ink-black);
}

.page-about .about-timeline__more > .about-p {
  margin-top: 10px;
  font-size: 14px;
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 18px;
}

.page-about .about-team__card {
  padding: 18px 18px 20px;
  background: var(--celadon-wash);
  border: 1px solid rgba(79, 117, 105, 0.24);
  transition: transform 200ms ease, border-color 200ms ease, box-shadow 200ms ease;
}

.page-about .about-team__card:hover,
.page-about .about-team__card:focus-within {
  transform: translateY(-3px);
  border-color: var(--gold);
  box-shadow: 0 8px 22px rgba(6, 17, 32, 0.1);
}

.page-about .about-team__count {
  margin: 0 0 2px;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: var(--celadon-deep);
}

.page-about .about-team__name {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 16px;
  color: var(--ink-black);
}

.page-about .about-team__duty {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: #2f403a;
}

/* ---------- 深色覆盖面板 ---------- */

.page-about .about-dark {
  position: relative;
  margin-top: 18px;
  padding: 24px 20px 26px;
  background: var(--ink-navy);
  color: var(--paper);
}

.page-about .about-dark::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 0;
  height: 0;
  border-left: 22px solid transparent;
  border-bottom: 22px solid var(--terracotta);
}

.page-about .about-dark .about-p {
  color: rgba(244, 239, 228, 0.84);
}

.page-about .about-legend {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 0;
  background: rgba(154, 163, 173, 0.26);
  border: 1px solid rgba(154, 163, 173, 0.26);
}

.page-about .about-legend__cell {
  background: var(--panel-navy);
  padding: 14px 16px 16px;
}

.page-about .about-legend__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 20px;
  letter-spacing: 0.03em;
  color: var(--gold-soft);
}

.page-about .about-legend__text {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(244, 239, 228, 0.78);
}

/* ---------- 原则 ---------- */

.page-about .about-rules {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: rule;
}

.page-about .about-rules > li {
  position: relative;
  padding: 16px 0 16px 40px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-rules > li:last-child {
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-rules > li::before {
  counter-increment: rule;
  content: counter(rule, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 18px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--terracotta);
}

.page-about .about-rules .about-h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.page-about .about-rules .about-p {
  font-size: 14px;
  margin-bottom: 0;
}

/* ---------- 荣誉 ---------- */

.page-about .about-honors {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-honors__item {
  padding: 14px 14px 16px;
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--gold);
}

.page-about .about-honors__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--ink-navy);
}

.page-about .about-honors__text {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--about-body);
}

/* ---------- 结尾行动 ---------- */

.page-about .about-cta {
  margin-top: 8px;
  padding-top: 26px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.page-about .about-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border: 1px solid var(--ink-navy);
  background: transparent;
  color: var(--ink-navy);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: background 180ms ease, color 180ms ease, border-color 180ms ease;
}

.page-about .about-btn:hover {
  background: var(--panel-navy);
  border-color: var(--panel-navy);
  color: var(--paper);
}

.page-about .about-btn--solid {
  background: var(--ink-navy);
  border-color: var(--ink-navy);
  color: var(--gold-soft);
}

.page-about .about-btn--solid:hover {
  background: var(--midnight);
  border-color: var(--midnight);
  color: var(--gold-soft);
}

/* ---------- 入场 ---------- */

.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 420ms ease, transform 420ms ease;
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */

@media (min-width: 600px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-honors {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-dark {
    padding: 28px 26px 30px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 36px 0 62px;
  }

  .page-about .about-hero__frame {
    padding: 34px 48px 52px;
  }

  .page-about .about-hero__lead {
    font-size: 16px;
  }

  .page-about .about-figures {
    margin-top: 40px;
  }

  .page-about .about-figures__num {
    font-size: 30px;
  }

  .page-about .about-doc {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 0 56px;
    padding-top: 56px;
    padding-bottom: 84px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 88px;
    align-self: start;
  }

  .page-about .index-rail {
    display: block;
    overflow: visible;
    padding: 0;
    border-left: 1px solid var(--about-line);
  }

  .page-about .index-rail__link {
    display: flex;
    width: 100%;
    margin-left: -1px;
    padding: 11px 0 11px 15px;
    border: 0;
    border-left: 2px solid transparent;
    background: transparent;
    font-size: 13px;
  }

  .page-about .index-rail__link:hover {
    background: rgba(212, 175, 55, 0.08);
    border-left-color: var(--gold-dim);
  }

  .page-about .index-rail__link.is-active {
    background: transparent;
    color: var(--ink-black);
    border-left-color: var(--gold);
  }

  .page-about .index-rail__link.is-active .index-rail__num {
    color: var(--gold);
  }

  .page-about .about-section {
    padding: 36px 0 42px;
  }

  .page-about .about-h3 {
    font-size: 18px;
  }

  .page-about .about-timeline {
    padding-left: 34px;
  }

  .page-about .about-timeline__item::before {
    left: -32px;
  }

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

  .page-about .about-dark {
    padding: 34px 34px 38px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .about-team__card {
    transition: none;
  }

  .page-about .index-rail__link,
  .page-about .about-btn {
    transition: none;
  }
}