.page-about {
  --about-shell: 1140px;
  --about-pad: clamp(1.75rem, 4vw, 3rem);
  background: var(--ink-900);
  color: var(--paper);
  padding-block: clamp(1.5rem, 3.5vw, 2.5rem) clamp(3rem, 7vw, 5rem);
  font-family: var(--font-body);
  line-height: 1.8;
  overflow-x: clip;
}

.page-about .about-shell {
  width: min(100% - 2rem, var(--about-shell));
  margin-inline: auto;
}

.page-about a:focus-visible,
.page-about [tabindex]:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .about-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(18, 214, 196, 0.45);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

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

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin-bottom: clamp(1rem, 2.5vw, 1.6rem);
  font-size: 0.8125rem;
}

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

.page-about .breadcrumb__link:hover {
  color: var(--cyan);
}

.page-about .breadcrumb__link[aria-current="page"] {
  color: var(--cyan);
}

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

/* ---------- 首屏框景 ---------- */
.page-about .about-hero__frame {
  position: relative;
  margin-top: 0.5rem;
  padding: clamp(2.1rem, 5vw, 3.2rem) var(--about-pad) var(--about-pad);
  border: 1px solid var(--line);
  border-radius: 4px;
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(18, 214, 196, 0.12), transparent 58%),
    radial-gradient(90% 80% at 0% 100%, rgba(255, 122, 47, 0.09), transparent 62%),
    linear-gradient(158deg, var(--ink-800), var(--ink-900) 78%);
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 88px;
  height: 88px;
  border-right: 1px solid rgba(240, 182, 77, 0.5);
  border-bottom: 1px solid rgba(240, 182, 77, 0.5);
  border-bottom-right-radius: 4px;
  pointer-events: none;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.75rem);
  grid-template-columns: 1fr;
}

.page-about .about-hero__lead h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 5.6vw, 3.5rem);
  line-height: 1.14;
  letter-spacing: -0.012em;
  margin: 0.7rem 0 0;
  color: var(--paper);
}

.page-about .about-hero__intro {
  margin: 1.1rem 0 0;
  max-width: 40em;
  color: var(--mist);
  font-size: clamp(0.95rem, 1.6vw, 1.0625rem);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: clamp(1.4rem, 3vw, 2rem);
}

.page-about .about-hero__mark {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(3.4rem, 13vw, 6.5rem);
  font-weight: 700;
  line-height: 0.82;
  letter-spacing: -0.05em;
  color: rgba(18, 214, 196, 0.18);
  text-align: right;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 1.1rem 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.8125rem;
}

.page-about .about-hero__k {
  color: var(--slate);
  letter-spacing: 0.08em;
}

.page-about .about-hero__v {
  font-family: var(--font-mono);
  color: var(--cyan);
}

/* ---------- 章节索引条 ---------- */
.page-about .about-index {
  display: flex;
  gap: 0.5rem;
  margin-top: clamp(1.25rem, 3vw, 2rem);
  padding-bottom: 0.35rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  flex: 0 0 auto;
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 2px;
  color: var(--mist);
  text-decoration: none;
  font-size: 0.8125rem;
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease), color 0.18s var(--ease);
}

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

.page-about .about-index__link[data-active="true"] {
  border-color: var(--cyan);
  background: rgba(18, 214, 196, 0.12);
  color: var(--paper);
}

.page-about .about-index__link .toc__num {
  font-family: var(--font-mono);
  color: var(--orange);
  font-size: 0.75rem;
}

.page-about .about-index__label {
  letter-spacing: 0.06em;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding-top: clamp(2.75rem, 7vw, 5rem);
}

.page-about .about-section__grid {
  display: grid;
  gap: clamp(1rem, 3vw, 2rem);
  grid-template-columns: 1fr;
  border-top: 1px solid var(--line);
  padding-top: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-section__meta {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.page-about .about-section__num {
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 6vw, 3.4rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.05em;
  color: var(--cyan);
}

.page-about .about-section__label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--slate);
  white-space: nowrap;
}

.page-about .about-section__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.45rem, 3.4vw, 2.1rem);
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin: 0 0 1rem;
  color: var(--paper);
}

.page-about .about-lead {
  margin: 0 0 1.5rem;
  max-width: 42em;
  font-size: clamp(0.95rem, 1.7vw, 1.0625rem);
  color: var(--mist);
}

.page-about .about-text p {
  margin: 0 0 1.05em;
  max-width: 42em;
  color: var(--mist);
}

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

.page-about .about-pullquote {
  margin-top: 1.5rem;
  padding: 1rem 0 1rem 1.15rem;
  border-left: 2px solid var(--orange);
  background: linear-gradient(90deg, rgba(255, 122, 47, 0.08), transparent 70%);
}

.page-about .about-pullquote p {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1rem, 2.1vw, 1.2rem);
  line-height: 1.6;
  color: var(--paper);
}

.page-about .about-note {
  margin: 1.5rem 0 0;
  max-width: 44em;
  font-size: 0.875rem;
  color: var(--slate);
  line-height: 1.85;
}

/* ---------- 媒体 ---------- */
.page-about .media {
  margin: 0 0 clamp(1.5rem, 3.5vw, 2.25rem);
}

.page-about .media__frame {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 6px 2px 6px 2px;
  overflow: hidden;
  background: var(--ink-800);
}

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

.page-about .media__caption {
  margin-top: 0.7rem;
  font-size: 0.75rem;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: clamp(1.4rem, 3vw, 2rem);
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(18, 214, 196, 0.12));
}

.page-about .timeline__item {
  position: relative;
  padding-left: 2.6rem;
}

.page-about .timeline__dot {
  position: absolute;
  left: 0;
  top: 0.35rem;
  width: 23px;
  height: 23px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  background: var(--ink-900);
  box-shadow: inset 0 0 0 4px var(--ink-900);
  transition: background-color 0.18s var(--ease), border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .timeline__item:nth-child(even) .timeline__dot {
  border-radius: 3px;
  transform: rotate(45deg);
}

.page-about .timeline__item:hover .timeline__dot,
.page-about .timeline__item:focus-within .timeline__dot {
  background: var(--cyan);
  border-color: var(--orange);
}

.page-about .timeline__year {
  margin: 0 0 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .timeline__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .timeline__desc {
  margin: 0;
  max-width: 40em;
  font-size: 0.9375rem;
  color: var(--mist);
}

.page-about .timeline__more {
  margin: 0.7rem 0 0;
  padding-left: 0.75rem;
  border-left: 2px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--slate);
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .timeline__item:hover .timeline__more,
.page-about .timeline__item:focus-within .timeline__more {
  border-left-color: var(--orange);
  color: var(--mist);
}

/* ---------- 团队四宫格 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 0.9rem;
  grid-template-columns: 1fr;
}

.page-about .team-card {
  position: relative;
  padding: 1.25rem 1.25rem 1.35rem;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: 12px 2px 12px 2px;
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .team-card--lead {
  background: linear-gradient(160deg, rgba(18, 214, 196, 0.1), var(--ink-800) 62%);
  border-color: rgba(18, 214, 196, 0.32);
}

.page-about .team-card:hover,
.page-about .team-card:focus-visible {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .team-card:focus-visible {
  box-shadow: 0 0 0 2px var(--cyan), 0 0 0 5px rgba(255, 122, 47, 0.55);
  outline: none;
}

.page-about .team-card__num {
  margin: 0 0 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .team-card h3 {
  margin: 0 0 0.55rem;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .team-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .team-card .team-card__meta {
  margin-top: 0.9rem;
  padding-top: 0.7rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  color: var(--slate);
}

/* ---------- 目录治理 ---------- */
.page-about .cat-rules {
  list-style: none;
  margin: 0 0 clamp(1.5rem, 3.5vw, 2.25rem);
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .cat-rule {
  padding: 1.05rem 1.15rem;
  background: rgba(10, 36, 64, 0.62);
  border: 1px solid var(--line);
  border-radius: 2px 10px 2px 10px;
}

.page-about .cat-rule p {
  margin: 0.7rem 0 0;
  font-size: 0.9375rem;
  color: var(--mist);
}

.page-about .catalog-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
  grid-template-columns: 1fr;
}

.page-about .catalog-stats__item {
  display: flex;
  align-items: baseline;
  gap: 0.65rem;
  padding: 0.9rem 1.05rem;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(90deg, rgba(18, 214, 196, 0.08), transparent 78%);
}

.page-about .catalog-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 4.4vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.03em;
}

.page-about .catalog-stats__label {
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}

/* ---------- 合作生态 ---------- */
.page-about .partners-field {
  height: 128px;
  margin-bottom: 1.25rem;
  border: 1px solid var(--line);
  border-radius: 4px;
  background-color: rgba(10, 36, 64, 0.5);
  background-image: radial-gradient(circle, rgba(240, 182, 77, 0.85) 0 2.4px, transparent 3px);
  background-size: calc(100% / 6) calc(100% / 7);
  background-position: center;
}

.page-about .partner-dirs {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
  display: grid;
  gap: 0.6rem;
  grid-template-columns: 1fr;
}

.page-about .partner-dir {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.3rem 0.9rem;
  padding: 0.75rem 0.95rem;
  border-left: 2px solid var(--line);
  background: rgba(10, 36, 64, 0.45);
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .partner-dir:hover,
.page-about .partner-dir:focus-within {
  border-left-color: var(--amber);
  background: rgba(10, 36, 64, 0.8);
}

.page-about .partner-dir__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--paper);
  min-width: 5.5em;
}

.page-about .partner-dir__note {
  font-size: 0.8125rem;
  color: var(--slate);
  transition: color 0.18s var(--ease);
}

.page-about .partner-dir:hover .partner-dir__note,
.page-about .partner-dir:focus-within .partner-dir__note {
  color: var(--mist);
}

/* ---------- 行动区 ---------- */
.page-about .about-cta {
  margin-top: clamp(3rem, 7vw, 5rem);
}

.page-about .about-cta__inner {
  padding: clamp(1.5rem, 4vw, 2.75rem);
  border: 1px solid rgba(240, 182, 77, 0.34);
  border-radius: 4px;
  background:
    radial-gradient(120% 120% at 100% 0%, rgba(255, 122, 47, 0.14), transparent 60%),
    linear-gradient(150deg, var(--ink-800), var(--ink-900) 76%);
}

.page-about .about-cta__title {
  margin: 0.6rem 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.35rem, 3.6vw, 2rem);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-cta__desc {
  margin: 0.85rem 0 0;
  max-width: 40em;
  font-size: 0.9375rem;
  color: var(--mist);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-shell {
    width: min(100% - 3rem, var(--about-shell));
  }

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

  .page-about .catalog-stats__item {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.45rem;
  }

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

  .page-about .partners-field {
    height: 156px;
  }
}

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
  }

  .page-about .about-section__grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    column-gap: clamp(2rem, 5vw, 3.5rem);
  }

  .page-about .about-section__meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    position: sticky;
    top: 1.5rem;
    align-self: start;
  }

  .page-about .about-section__label {
    writing-mode: horizontal-tb;
  }
}

@media (min-width: 860px) {
  .page-about .team-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .team-card:nth-child(1) {
    grid-area: 1 / 1 / 4 / 7;
  }

  .page-about .team-card:nth-child(2) {
    grid-area: 1 / 7 / 2 / 13;
  }

  .page-about .team-card:nth-child(3) {
    grid-area: 2 / 7 / 4 / 10;
  }

  .page-about .team-card:nth-child(4) {
    grid-area: 2 / 10 / 4 / 13;
  }
}

@media (min-width: 1080px) {
  .page-about .partner-dirs {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.75rem;
  }

  .page-about .partner-dir {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
  }
}