.page-about {
  --about-gap: 28px;
  --about-rule: rgba(55, 230, 212, 0.16);
  background: var(--surface-1);
  color: var(--ink);
  font-family: var(--font-body);
  padding-top: calc(var(--header-h) + 28px);
}

.page-about .mono {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

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

.page-about .about-h2 {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.6rem, 4.4vw, 2.75rem);
  line-height: 1.22;
  letter-spacing: 0.02em;
  color: var(--ink);
  margin: 14px 0 18px;
  max-width: 22em;
}

.page-about .about-sub {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--ink);
  opacity: 0.86;
  max-width: 38em;
  margin: 0 0 14px;
}

.page-about .eyebrow {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-accent);
  margin: 0;
}

.page-about .eyebrow-index {
  color: var(--cyan);
  opacity: 0.8;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-bottom: 64px;
  background:
    radial-gradient(110% 80% at 82% 0%, rgba(55, 230, 212, 0.12), transparent 60%),
    radial-gradient(90% 70% at 0% 30%, rgba(18, 63, 94, 0.7), transparent 70%),
    linear-gradient(180deg, var(--surface-2), var(--surface-1) 82%);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-hero .breadcrumb {
  font-size: 0.8125rem;
  color: var(--ink-mute);
  margin-bottom: 30px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.page-about .about-hero .breadcrumb a {
  color: var(--ink-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

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

.page-about .about-hero .breadcrumb .sep {
  color: var(--ink-mute);
}

.page-about .about-hero-grid {
  display: grid;
  gap: 36px;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2rem, 6.2vw, 4rem);
  line-height: 1.12;
  letter-spacing: 0.015em;
  color: var(--salt);
  margin: 16px 0 22px;
  max-width: 16em;
}

.page-about .about-lede {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink);
  opacity: 0.9;
  max-width: 34em;
  margin: 0 0 14px;
}

.page-about .about-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 32px;
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-hero-meta .k {
  display: block;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ink-mute);
  margin-bottom: 6px;
}

.page-about .about-hero-meta .v {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--cyan);
}

.page-about .about-hero-media {
  position: relative;
  margin: 0;
}

.page-about .about-hero-media::before {
  content: "";
  position: absolute;
  top: 10px;
  right: 10px;
  width: 42px;
  height: 42px;
  border-top: 1px solid var(--cyan);
  border-right: 1px solid var(--cyan);
  opacity: 0.6;
  pointer-events: none;
}

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

/* ---------- 起点 ---------- */
.page-about .about-start-inner {
  display: grid;
  gap: 24px;
}

.page-about .about-start-label {
  display: flex;
  align-items: baseline;
  gap: 18px;
  flex-wrap: wrap;
}

.page-about .about-start-year {
  font-size: 2.5rem;
  line-height: 1;
  color: var(--clay);
  letter-spacing: 0.06em;
}

.page-about .about-start-copy p {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink);
  opacity: 0.88;
  max-width: 36em;
  margin: 0 0 14px;
}

/* ---------- 版本节点 / 时间轴 ---------- */
.page-about .about-verse-head {
  margin-bottom: 40px;
}

.page-about .about-timeline {
  display: grid;
  gap: 30px;
}

.page-about .about-years {
  border-top: 1px solid var(--about-rule);
  padding-top: 14px;
}

.page-about .about-years-title {
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--ink-mute);
  margin: 0;
}

.page-about .about-years-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-year-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line-soft);
  border-radius: 2px;
  color: var(--ink-mute);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-year-note {
  font-family: var(--font-body);
  font-size: 12px;
  color: var(--ink-mute);
}

.page-about .about-year-link:hover,
.page-about .about-year-link:focus-visible {
  color: var(--mist);
  border-color: var(--cyan);
  background: rgba(55, 230, 212, 0.08);
}

.page-about .about-year-link:hover .about-year-note,
.page-about .about-year-link:focus-visible .about-year-note {
  color: var(--ink-accent);
}

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

.page-about .about-node {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  column-gap: 16px;
  position: relative;
  padding-bottom: 34px;
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-node:last-child {
  padding-bottom: 0;
}

.page-about .about-node-marker {
  grid-column: 1;
  grid-row: 1 / span 3;
  position: relative;
  width: 22px;
}

.page-about .about-node-marker::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 12px;
  bottom: -34px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(55, 230, 212, 0.14) 60%, rgba(181, 106, 74, 0.3));
}

.page-about .about-node:last-child .about-node-marker::before {
  display: none;
}

.page-about .about-node-marker::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  width: 13px;
  height: 13px;
  border: 1px solid var(--cyan);
  background: var(--surface-1);
  transform: rotate(45deg);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-node:hover .about-node-marker::after {
  background: var(--cyan);
}

.page-about .about-node-year {
  grid-column: 2;
  margin: 0 0 6px;
  font-size: 1.75rem;
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: 0.08em;
  transition: color 0.2s ease;
}

.page-about .about-node:hover .about-node-year {
  color: var(--mist);
}

.page-about .about-node-body {
  grid-column: 2;
  min-width: 0;
}

.page-about .about-node-body h3 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.125rem;
  line-height: 1.5;
  color: var(--salt);
  margin: 10px 0 10px;
}

.page-about .about-node-body p {
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--ink);
  opacity: 0.84;
  margin: 0;
  max-width: 40em;
}

.page-about .tag {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.1em;
  padding: 3px 10px;
  border-radius: 2px;
  border: 1px solid transparent;
}

.page-about .tag--clay {
  color: var(--clay);
  border-color: rgba(181, 106, 74, 0.5);
  background: rgba(181, 106, 74, 0.1);
}

.page-about .tag--moss {
  color: var(--moss);
  border-color: rgba(111, 143, 122, 0.55);
  background: rgba(111, 143, 122, 0.1);
}

/* ---------- 团队 ---------- */
.page-about .about-team-layout {
  display: grid;
  gap: 34px;
}

.page-about .about-roles {
  margin: 26px 0 0;
}

.page-about .about-role {
  padding: 16px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-role:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-role dt {
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .about-role dd {
  margin: 7px 0 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--ink);
  opacity: 0.85;
  max-width: 40em;
}

/* ---------- 资料库 ---------- */
.page-about .about-library-layout {
  display: grid;
  gap: 30px;
}

.page-about .about-library-copy p {
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--ink);
  opacity: 0.87;
  max-width: 38em;
  margin: 0 0 14px;
}

.page-about .about-lib-stats {
  list-style: none;
  margin: 24px 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--about-rule);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 22px;
}

.page-about .about-stat-num {
  display: block;
  font-size: 1.5rem;
  line-height: 1.2;
  color: var(--cyan);
  letter-spacing: 0.04em;
}

.page-about .about-stat-label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-mute);
  line-height: 1.6;
}

.page-about .about-library-note {
  font-size: 0.875rem !important;
  color: var(--ink-mute) !important;
  opacity: 1 !important;
  border-left: 1px solid rgba(181, 106, 74, 0.55);
  padding-left: 14px;
}

/* ---------- 服务方式 ---------- */
.page-about .about-principles-head {
  margin-bottom: 34px;
}

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

.page-about .about-principle {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  padding: 24px 0;
  border-top: 1px solid var(--line-soft);
  position: relative;
}

.page-about .about-principle:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-principle::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -1px;
  width: 64px;
  height: 1px;
  background: var(--cyan);
  opacity: 0.5;
}

.page-about .about-principle-index {
  font-size: 0.875rem;
  color: var(--cyan);
  opacity: 0.75;
  padding-top: 4px;
}

.page-about .about-principle-body h3 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.25rem;
  line-height: 1.4;
  color: var(--salt);
  margin: 0 0 10px;
}

.page-about .about-principle-body p {
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--ink);
  opacity: 0.84;
  max-width: 44em;
  margin: 0;
}

.page-about .about-trust {
  margin: 32px 0 0;
  padding: 18px 20px;
  border-left: 2px solid var(--coral);
  background: rgba(18, 63, 94, 0.5);
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--ink);
  max-width: 46em;
}

/* ---------- 继续了解 ---------- */
.page-about .about-next-links {
  display: grid;
  gap: 2px;
  margin-top: 8px;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-next-link {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 6px 18px;
  padding: 20px 4px;
  border-bottom: 1px solid var(--line-soft);
  text-decoration: none;
  color: var(--ink);
  transition: background-color 0.2s ease, padding-left 0.2s ease;
}

.page-about .about-next-kicker {
  grid-column: 1;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ink-mute);
}

.page-about .about-next-title {
  grid-column: 1;
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-next-arrow {
  grid-column: 2;
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--cyan);
  transition: transform 0.2s ease, color 0.2s ease;
}

.page-about .about-next-link:hover,
.page-about .about-next-link:focus-visible {
  background: rgba(55, 230, 212, 0.06);
  padding-left: 12px;
}

.page-about .about-next-link:hover .about-next-arrow,
.page-about .about-next-link:focus-visible .about-next-arrow {
  color: var(--coral);
  transform: translateX(4px);
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 720px) {
  .page-about .about-lib-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-next-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 32px;
  }
}

@media (min-width: 900px) {
  .page-about {
    padding-top: calc(var(--header-h) + 36px);
  }

  .page-about .about-hero {
    padding-bottom: 88px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: end;
    gap: 56px;
  }

  .page-about .about-start-inner {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-start-label {
    flex-direction: column;
    gap: 14px;
    border-top: 1px solid var(--about-rule);
    padding-top: 18px;
  }

  .page-about .about-start-year {
    font-size: 3.25rem;
  }

  .page-about .about-timeline {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-years {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    border-top: 1px solid var(--about-rule);
  }

  .page-about .about-years-list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
    margin-top: 14px;
  }

  .page-about .about-year-link {
    display: flex;
    width: 100%;
    justify-content: space-between;
    border: 0;
    border-left: 2px solid transparent;
    padding: 9px 10px;
    font-size: 0.9375rem;
  }

  .page-about .about-year-link:hover,
  .page-about .about-year-link:focus-visible {
    border-left-color: var(--cyan);
    background: rgba(55, 230, 212, 0.07);
  }

  .page-about .about-node {
    grid-template-columns: 24px minmax(0, 1fr);
    column-gap: 22px;
    padding-bottom: 42px;
  }

  .page-about .about-node-year {
    font-size: 2.25rem;
  }

  .page-about .about-node-marker::before {
    left: 11px;
    bottom: -42px;
  }

  .page-about .about-team-layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-library-layout {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 52px;
    align-items: center;
  }

  .page-about .about-principle {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 20px;
    padding: 30px 0;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero h1 {
    letter-spacing: 0.02em;
  }

  .page-about .about-next-links {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 24px;
  }

  .page-about .about-next-link {
    grid-template-columns: minmax(0, 1fr);
    align-items: start;
    padding: 22px 8px 26px;
  }

  .page-about .about-next-arrow {
    grid-column: 1;
    grid-row: 3;
    margin-top: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}