.page-about {
  background: var(--ink-900);
  color: var(--white);
  --about-measure: 66ch;
}

.page-about .ua-breadcrumb {
  padding-top: clamp(14px, 3vw, 24px);
  font-size: 13px;
  color: var(--moss);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 4vw, 40px) 0 clamp(32px, 6vw, 64px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -20%;
  right: -10%;
  width: 60vw;
  height: 60vw;
  max-width: 720px;
  max-height: 720px;
  background: radial-gradient(circle at 50% 50%, rgba(184, 255, 60, 0.13), rgba(184, 255, 60, 0) 68%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: end;
}

.page-about .about-hero__title {
  margin: 14px 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(29px, 6.4vw, 58px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--white);
  max-width: 15em;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 34em;
  font-family: var(--font-serif);
  font-size: clamp(15px, 2.1vw, 18px);
  line-height: 1.9;
  color: var(--moss);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin: clamp(20px, 4vw, 32px) 0 0;
  padding: 0;
}

.page-about .about-hero__meta div {
  padding-top: 10px;
  border-top: 1px solid var(--line);
  min-width: 104px;
}

.page-about .about-hero__meta dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--moss);
  text-transform: uppercase;
}

.page-about .about-hero__meta dd {
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__figure {
  margin: 0;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  border-radius: var(--radius-card);
  border: 1px solid var(--line);
  filter: saturate(0.9) brightness(0.95);
}

.page-about .about-hero__figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--moss);
}

/* ---------- 两栏骨架 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  padding: clamp(32px, 6vw, 72px) 0 clamp(48px, 8vw, 96px);
}

.page-about .about-rail {
  display: none;
}

.page-about .about-body {
  display: flex;
  flex-direction: column;
  gap: clamp(40px, 7vw, 82px);
  min-width: 0;
}

.page-about .about-sec {
  scroll-margin-top: 96px;
}
.page-about .about-sec__num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-sec__title {
  margin: 0 0 clamp(16px, 3vw, 26px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(21px, 3.8vw, 33px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-sec__intro {
  margin: 0 0 clamp(16px, 3vw, 24px);
  max-width: var(--about-measure);
  font-size: 16px;
  line-height: 1.9;
  color: var(--moss);
}

/* ---------- 纸感档案卡 ---------- */
.page-about .about-paper {
  background: var(--paper);
  color: var(--paper-ink);
  border-radius: var(--radius-card);
  padding: clamp(20px, 3.6vw, 36px);
  box-shadow: var(--shadow-deep);
}

.page-about .about-paper p {
  margin: 0 0 1em;
  font-size: 16px;
  line-height: 1.88;
  max-width: 70ch;
}

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

.page-about .about-paper__lead {
  font-family: var(--font-serif);
  font-size: 17px !important;
  font-weight: 600;
  line-height: 1.85 !important;
}

/* ---------- 三条轴 ---------- */
.page-about .about-pillars {
  display: grid;
  gap: 12px;
  margin-bottom: 20px;
}

.page-about .about-pillar {
  padding: 18px 18px 20px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius-soft);
}

.page-about .about-pillar--mid {
  background: var(--blue-900);
  border-color: rgba(184, 255, 60, 0.34);
}

.page-about .about-pillar__num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--lime);
}

.page-about .about-pillar__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  line-height: 1.4;
  color: var(--white);
}

.page-about .about-pillar p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--moss);
}

.page-about .about-quote {
  border-left: 3px solid var(--lime);
  padding: 4px 0 4px 18px;
}

.page-about .about-quote p {
  margin: 0;
  max-width: 62ch;
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.9;
  color: var(--moss);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-versions {
  display: grid;
  gap: clamp(22px, 4vw, 34px);
}

.page-about .about-versions__figure {
  margin: 0;
}

.page-about .about-versions__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-card);
  border: 1px solid var(--line);
}

.page-about .about-versions__figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--moss);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 18px;
  border-left: 1px solid var(--line);
}

.page-about .about-tl {
  position: relative;
  padding: 0 0 26px;
}

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

.page-about .about-tl::before {
  content: "";
  position: absolute;
  top: 7px;
  left: -24px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--line);
}

.page-about .about-tl--now::before {
  background: var(--lime);
  border-color: var(--lime);
  box-shadow: 0 0 0 4px rgba(184, 255, 60, 0.16);
}

.page-about .about-tl__year {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 18px;
  letter-spacing: 0.08em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-tl--now .about-tl__year {
  color: var(--lime);
}

.page-about .about-tl__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 16px;
  line-height: 1.5;
  color: var(--white);
}

.page-about .about-tl__desc {
  margin: 0;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--moss);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(18px, 3.4vw, 30px);
}

.page-about .about-team__figure {
  margin: 0;
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-card);
  border: 1px solid var(--line);
}

.page-about .about-team__figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--moss);
}

.page-about .about-team__text p {
  margin: 0 0 1em;
  max-width: var(--about-measure);
  font-size: 16px;
  line-height: 1.9;
  color: var(--moss);
}

.page-about .about-team__text p:first-child {
  color: var(--white);
}

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

/* ---------- 规模数据 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-stat {
  padding: 16px 14px 18px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius-soft);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-stat--alt {
  background: var(--blue-900);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(23px, 4.2vw, 32px);
  line-height: 1.1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat--alt .about-stat__num {
  color: var(--white);
}

.page-about .about-stat__label {
  font-size: 13px;
  line-height: 1.65;
  color: var(--moss);
}

.page-about .about-stats__note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--moss);
}

/* ---------- 原则清单 ---------- */
.page-about .about-rules {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-rules li {
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 12px;
  padding: 16px 0;
  border-top: 1px dashed rgba(20, 17, 12, 0.28);
}

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

.page-about .about-rules__num {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 2.2;
  color: #6B7F55;
}

.page-about .about-rules h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 16px;
  line-height: 1.5;
  color: var(--paper-ink);
}

.page-about .about-rules p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: #2C2A22;
  max-width: 64ch;
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 24px;
  align-items: center;
  justify-content: space-between;
  padding: clamp(20px, 3.6vw, 34px);
  border: 1px solid rgba(184, 255, 60, 0.5);
  border-radius: var(--radius-card);
  background: linear-gradient(135deg, rgba(184, 255, 60, 0.1), rgba(11, 29, 51, 0) 62%);
}

.page-about .about-cta__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(17px, 2.8vw, 22px);
  line-height: 1.4;
  color: var(--white);
}

.page-about .about-cta__sub {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--moss);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-fineprint {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.9;
  color: var(--moss);
}

.page-about .about-fineprint a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-layout {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 76px);
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-rail__label {
    margin: 0 0 12px;
    padding-left: 14px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.2em;
    color: var(--moss);
  }

  .page-about .about-rail__nav {
    display: flex;
    flex-direction: column;
  }

  .page-about .about-rail__nav a {
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 9px 0 9px 14px;
    border-left: 2px solid var(--line);
    font-size: 14px;
    line-height: 1.5;
    color: var(--moss);
    text-decoration: none;
    transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
  }

  .page-about .about-rail__nav a:hover {
    color: var(--white);
    border-left-color: var(--moss);
  }

  .page-about .about-rail__nav a[aria-current="true"] {
    color: var(--lime);
    border-left-color: var(--lime);
  }

  .page-about .about-rail__num {
    font-family: var(--font-mono);
    font-size: 11px;
    color: inherit;
    font-variant-numeric: tabular-nums;
  }

  .page-about .about-rail__cta {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 20px;
    padding-left: 14px;
    font-size: 13px;
    color: var(--orange);
    text-decoration: none;
  }

  .page-about .about-rail__cta:hover {
    color: var(--lime);
  }

  .page-about .about-versions {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
    gap: clamp(24px, 4vw, 44px);
  }

  .page-about .about-versions__figure {
    position: sticky;
    top: 96px;
  }

  .page-about .about-sec__title {
    max-width: 22em;
  }
}

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