.page-about {
  --about-toc-w: 208px;
  --about-gutter: 24px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding: 40px 0 56px;
  background:
    radial-gradient(120% 90% at 12% 0%, rgba(31, 111, 92, 0.42) 0%, rgba(8, 42, 36, 0) 62%),
    var(--ink);
  border-bottom: 1px solid var(--line);
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .breadcrumb__list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-strong);
}

.page-about .breadcrumb__list a {
  color: var(--gold-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

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

.page-about .about-hero__frame {
  position: relative;
  padding: clamp(20px, 3.6vw, 48px);
  border: 2px solid var(--line-strong);
  border-radius: var(--radius);
  background-color: var(--ink-deep);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 44px 44px;
  box-shadow: var(--shadow);
}

.page-about .about-hero__corner {
  position: absolute;
  top: -2px;
  left: -2px;
  width: 72px;
  height: 72px;
  border-top: 4px solid var(--gold);
  border-left: 4px solid var(--gold);
  border-top-left-radius: var(--radius);
  pointer-events: none;
}

.page-about .about-hero__tick {
  position: absolute;
  top: 0;
  right: clamp(16px, 3vw, 40px);
  transform: translateY(-50%);
  padding: 4px 12px;
  background: var(--gold);
  color: var(--graphite);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  border-radius: 2px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

.page-about .kicker {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.2rem, 6.4vw, 4.6rem);
  line-height: 1.08;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-hero__title em {
  display: block;
  font-style: normal;
  font-weight: 700;
  color: var(--gold);
}

.page-about .about-hero__intro {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--gold-soft);
  max-width: 46ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 12px;
  margin: clamp(24px, 3vw, 40px) 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 12px;
  border-left: 2px solid var(--line-strong);
}

.page-about .stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.page-about .stat__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: 28px;
  padding: 48px 0 72px;
}

.page-about .about-toc__label {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.page-about .about-toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

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

.page-about .about-toc__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: var(--ink-2);
  color: var(--gold-soft);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

.page-about .about-toc__list a .mono {
  font-size: 11px;
  color: var(--gold);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  background: var(--felt);
  border-color: var(--gold);
  color: var(--paper);
  outline: none;
}

.page-about .about-toc__note {
  display: none;
  margin: 24px 0 0;
  padding: 14px;
  border: 1px dashed var(--line-strong);
  border-radius: 12px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-toc__note a {
  display: block;
  margin-top: 6px;
  color: var(--cyan);
  text-decoration: none;
}

.page-about .about-toc__note a:hover,
.page-about .about-toc__note a:focus-visible {
  text-decoration: underline;
}

/* ---------- 章节 ---------- */
.page-about .about-block {
  padding: clamp(28px, 4.4vw, 48px) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 100px;
}

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

.page-about .about-block__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 20px;
}

.page-about .index-tag {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gold);
  padding-bottom: 2px;
  border-bottom: 2px solid var(--gold);
}

.page-about .about-block__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.4vw, 2.35rem);
  line-height: 1.28;
  color: var(--paper);
}

.page-about .about-block__lead {
  margin: 0 0 24px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--gold-soft);
}

.page-about .about-block__text p {
  margin: 0 0 16px;
  max-width: 78ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 240, 230, 0.86);
}

.page-about .about-block__link {
  margin: 4px 0 0;
  max-width: 78ch;
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--muted);
}

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

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

.page-about .about-block__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* 纸面章 */
.page-about .about-block--paper {
  margin: 8px 0;
  padding: clamp(24px, 4vw, 44px) clamp(18px, 3vw, 36px);
  background: var(--paper);
  color: var(--graphite);
  border: 2px solid var(--graphite);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.page-about .about-block--paper .about-block__title {
  color: var(--ink);
}

.page-about .about-block--paper .about-block__lead {
  color: var(--ink-2);
}

.page-about .about-block--paper .index-tag {
  color: var(--felt);
  border-bottom-color: var(--felt);
}

/* 深绿章 */
.page-about .about-block--ink2 {
  margin: 8px 0;
  padding: clamp(24px, 4vw, 44px) clamp(18px, 3vw, 36px);
  background: var(--ink-2);
  border: 2px solid var(--line-strong);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

/* ---------- 原则卡 ---------- */
.page-about .principles {
  display: grid;
  gap: 18px;
}

.page-about .principle {
  position: relative;
  padding: 22px;
  background: var(--ink-2);
  border: 2px solid var(--line-strong);
  border-radius: 14px;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.2s ease, box-shadow 0.22s ease, transform 0.22s ease;
}

.page-about .principle:hover,
.page-about .principle:focus,
.page-about .principle:focus-within {
  border-color: var(--gold);
  box-shadow: var(--shadow-violet);
  transform: translate(-2px, -2px);
  outline: none;
}

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

.page-about .principle__no {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .principle__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 1.22rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .principle__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(244, 240, 230, 0.82);
}

.page-about .principle__case {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.32s ease, opacity 0.24s ease, margin-top 0.24s ease;
}

.page-about .principle:hover .principle__case,
.page-about .principle:focus .principle__case,
.page-about .principle:focus-within .principle__case {
  max-height: 340px;
  opacity: 1;
  margin-top: 14px;
}

.page-about .principle__case p {
  margin: 0 0 8px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--gold-soft);
}

.page-about .principle__case-label {
  font-family: var(--font-mono);
  font-size: 11px !important;
  letter-spacing: 0.14em;
  color: var(--violet) !important;
  filter: brightness(1.5);
}

.page-about .principle__action {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 图片框 ---------- */
.page-about .about-figure {
  margin: 26px 0 0;
  border: 2px solid var(--line-strong);
  border-radius: 14px;
  overflow: hidden;
  background: var(--ink-deep);
}

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

.page-about .about-figure .media-frame__caption {
  padding: 12px 16px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.page-about .about-figure--narrow {
  max-width: 480px;
}

/* ---------- 角色与步骤 ---------- */
.page-about .scope-grid {
  display: grid;
  gap: 26px;
}

.page-about .scope-sub {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--felt);
}

.page-about .scope-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: rgba(27, 31, 28, 0.16);
  border: 1px solid rgba(27, 31, 28, 0.22);
  border-radius: 12px;
  overflow: hidden;
}

.page-about .scope-list li {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  background: var(--paper);
  transition: background-color 0.18s ease;
}

.page-about .scope-list li:hover {
  background: #fffdf6;
}

.page-about .scope-list__role {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  color: var(--ink);
}

.page-about .scope-list__say {
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ink-2);
}

.page-about .steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .steps__item {
  position: relative;
  padding: 14px 16px 14px 20px;
  border-left: 3px solid var(--felt);
  background: rgba(255, 255, 255, 0.55);
  border-radius: 0 10px 10px 0;
}

.page-about .steps__item:hover {
  border-left-color: var(--gold);
}

.page-about .steps__no {
  display: block;
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--felt);
}

.page-about .steps__item h4 {
  margin: 4px 0 4px;
  font-family: var(--font-display);
  font-size: 15.5px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .steps__item p {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-2);
}

/* ---------- 十二类场景 ---------- */
.page-about .scenes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.page-about .scene {
  position: relative;
  padding: 16px 14px 20px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 28px 28px;
  transition: background-color 0.2s ease;
}

.page-about .scene:hover {
  background-color: rgba(31, 111, 92, 0.24);
}

.page-about .scene:focus-within {
  background-color: rgba(31, 111, 92, 0.24);
  outline: 1px solid var(--gold);
  outline-offset: -1px;
}

.page-about .scene__no {
  display: block;
  font-size: 11px;
  color: var(--gold);
  letter-spacing: 0.1em;
}

.page-about .scene__name {
  margin: 6px 0 6px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .scene__text {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .scene__link {
  display: inline-block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
  opacity: 1;
  transition: opacity 0.18s ease, color 0.18s ease;
}

.page-about .scene__link:hover,
.page-about .scene__link:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold);
  outline: none;
}

/* ---------- 团队 ---------- */
.page-about .team-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 26px;
}

.page-about .team-stat {
  padding: 14px 12px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  border-radius: 0 10px 10px 0;
  background: rgba(5, 28, 23, 0.4);
}

.page-about .team-grid {
  display: grid;
  gap: 18px;
}

.page-about .team-card {
  padding: 20px;
  border-radius: 14px;
}

.page-about .panel--frame {
  border: 2px solid var(--line-strong);
  background: var(--ink-deep);
  box-shadow: var(--shadow-sm);
}

.page-about .team-card__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--gold-soft);
}

.page-about .team-card__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .team-card__list li {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 8px;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(244, 240, 230, 0.84);
}

.page-about .team-card__list .mono {
  font-size: 11px;
  color: var(--gold);
  padding-top: 3px;
}

.page-about .team-card--note {
  border: 2px dashed var(--line-cyan);
  background: rgba(77, 224, 208, 0.06);
}

.page-about .team-card--note p {
  margin: 0 0 12px;
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(244, 240, 230, 0.86);
}

.page-about .team-card__meta {
  margin: 0 !important;
  font-size: 11.5px !important;
  letter-spacing: 0.1em;
  color: var(--cyan) !important;
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  overflow-x: auto;
  padding: 6px 0 14px;
  -webkit-overflow-scrolling: touch;
}

.page-about .timeline:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}

.page-about .timeline__track {
  position: relative;
  display: grid;
  grid-template-columns: repeat(5, minmax(168px, 1fr));
  gap: 18px;
  min-width: 760px;
  margin: 0;
  padding: 26px 0 0;
  list-style: none;
}

.page-about .timeline__track::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--gold) 0%, var(--line-strong) 100%);
}

.page-about .timeline__track::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 0;
  right: 0;
  height: 6px;
  background-image: repeating-linear-gradient(90deg, var(--line-strong) 0 1px, transparent 1px 14px);
}

.page-about .timeline__item {
  position: relative;
  padding-right: 10px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  top: -22px;
  left: 0;
  width: 10px;
  height: 10px;
  background: var(--gold);
  border: 2px solid var(--ink);
  transform: rotate(45deg);
}

.page-about .timeline__item:hover::before {
  background: var(--cyan);
}

.page-about .timeline__year {
  display: block;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .timeline__name {
  margin: 6px 0 8px;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .timeline__item p {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 合作生态 ---------- */
.page-about .partners {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .partner {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--felt);
  border-radius: 0 0 12px 12px;
  background: var(--ink-2);
  transition: border-top-color 0.2s ease, transform 0.2s ease;
}

.page-about .partner:hover {
  border-top-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .partner__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .partner p {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .partner-note {
  margin-top: 24px;
  padding: 18px 20px;
  background: var(--violet);
  color: var(--paper);
  border: 2px solid var(--ink-deep);
  border-radius: 14px;
  box-shadow: var(--shadow-sm);
}

.page-about .partner-note__label {
  margin: 0 0 8px !important;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--gold-soft);
}

.page-about .partner-note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: #fff;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 860px) {
  .page-about .about-hero {
    padding: 56px 0 72px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: end;
  }

  .page-about .about-hero__aside {
    padding-left: clamp(16px, 2.4vw, 32px);
    border-left: 1px solid var(--line);
  }

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

  .page-about .scope-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .page-about .team-grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 22px;
  }

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

  .page-about .scene__link {
    opacity: 0;
  }

  .page-about .scene:hover .scene__link,
  .page-about .scene:focus-within .scene__link {
    opacity: 1;
  }
}

@media (min-width: 1040px) {
  .page-about .about-body {
    grid-template-columns: var(--about-toc-w) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
    padding: 64px 0 88px;
  }

  .page-about .about-toc {
    position: sticky;
    top: 104px;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 6px;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-toc__list li {
    flex: 1 1 auto;
  }

  .page-about .about-toc__list a {
    display: flex;
    width: 100%;
    padding: 9px 12px;
    border-radius: 10px;
    border-color: transparent;
    background: transparent;
    color: var(--muted);
  }

  .page-about .about-toc__list a:hover,
  .page-about .about-toc__list a:focus-visible {
    background: var(--ink-2);
    border-color: var(--line-strong);
    color: var(--paper);
  }

  .page-about .about-toc__note {
    display: block;
  }

  .page-about .about-block {
    padding: clamp(36px, 4vw, 56px) 0;
  }

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

@media (hover: none) {
  .page-about .scene__link {
    opacity: 1;
  }

  .page-about .principle__case {
    max-height: 340px;
    opacity: 1;
    margin-top: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .principle,
  .page-about .principle__case,
  .page-about .scene,
  .page-about .partner,
  .page-about .about-toc__list a {
    transition: none;
  }

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