.page-about {
  --about-rail: 96px;
  --about-line: 96px;
  --about-gap: 24px;
  display: block;
  background:
    radial-gradient(120% 60% at 88% 0%, rgba(30, 122, 70, 0.16) 0%, rgba(11, 27, 42, 0) 62%),
    var(--space);
  color: var(--bone);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: 26px;
  padding-bottom: 4px;
  font-size: 13px;
  color: var(--stone);
}
.page-about .breadcrumb a {
  color: var(--stone);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--score);
  border-bottom-color: var(--score);
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--bone);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding-top: 32px;
  padding-bottom: 8px;
}

.page-about .about-hero__frame {
  position: relative;
  padding: 30px 22px 26px;
  border: 1px solid var(--rule);
  background:
    linear-gradient(158deg, rgba(30, 122, 70, 0.18) 0%, rgba(8, 18, 28, 0) 58%),
    linear-gradient(0deg, rgba(8, 18, 28, 0.6) 0%, rgba(8, 18, 28, 0.15) 100%);
}
.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  width: 15px;
  height: 15px;
  border: 1px solid var(--score);
}
.page-about .about-hero__frame::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}
.page-about .about-hero__frame::after {
  bottom: -1px;
  right: -1px;
  border-left: 0;
  border-top: 0;
}

.page-about .about-hero__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--grass-bright);
  margin: 0 0 14px;
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  max-width: 20ch;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(28px, 6.6vw, 54px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--bone);
  transform: skewX(-5deg);
  transform-origin: left bottom;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(243, 239, 228, 0.86);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 26px;
  background: var(--rule);
  border: 1px solid var(--rule);
}
.page-about .about-stats__cell {
  background: var(--space);
  padding: 16px 14px 18px;
}
.page-about .about-stats__value {
  display: inline-block;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--moss);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  line-height: 1;
  color: var(--score);
}
.page-about .about-stats__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--stone);
}

/* ---------- 时间线骨架 ---------- */
.page-about .about-timeline {
  padding-top: 48px;
  padding-bottom: 24px;
}

.page-about .about-chapter {
  position: relative;
  padding-bottom: 60px;
}

.page-about .about-chapter__year {
  display: inline-block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--void);
  background: var(--clay);
  padding: 4px 10px;
  transform: skewX(-5deg);
}
.page-about .about-chapter__dot {
  display: none;
}

.page-about .about-chapter__title {
  margin: 0 0 18px;
  max-width: 22ch;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(22px, 4.6vw, 34px);
  line-height: 1.18;
  letter-spacing: -0.015em;
  color: var(--bone);
}

.page-about .about-chapter__body p {
  max-width: 66ch;
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(243, 239, 228, 0.84);
}
.page-about .about-chapter__body p:last-child {
  margin-bottom: 0;
}

/* ---------- 版本里程碑 ---------- */
.page-about .milestones {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .milestone {
  border: 1px solid var(--rule);
  border-left: 2px solid var(--clay);
  background: rgba(8, 18, 28, 0.62);
  padding: 16px 18px 18px;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.page-about .milestone:hover,
.page-about .milestone:focus-within {
  border-color: var(--score);
  background: rgba(8, 18, 28, 0.9);
}

.page-about .milestone__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
}
.page-about .milestone__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 19px;
  line-height: 1;
  color: var(--clay);
}
.page-about .milestone__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.35;
  color: var(--bone);
}
.page-about .milestone__text {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--stone);
}
.page-about .milestone__extra {
  margin: 10px 0 0;
  padding-left: 12px;
  border-left: 1px solid var(--moss);
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.72;
  color: var(--grass-bright);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 26px 0 0;
}
.page-about .about-figure .figure__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 三级复核 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 26px 0 0;
  padding: 1px;
  display: grid;
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}
.page-about .about-step {
  position: relative;
  background: var(--void);
  padding: 24px 20px 24px;
}
.page-about .about-step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--grass);
}
.page-about .about-step:nth-child(2)::before {
  background: var(--clay);
}
.page-about .about-step:nth-child(3)::before {
  background: var(--cyan);
}
.page-about .about-step__idx {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--stone);
  margin-bottom: 12px;
}
.page-about .about-step__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 18px;
  color: var(--bone);
}
.page-about .about-step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--stone);
}

/* ---------- 团队分工（米白画册块） ---------- */
.page-about .about-team {
  display: grid;
  gap: 14px;
  margin: 26px 0;
}
.page-about .about-team__unit {
  background: var(--bone);
  color: var(--void);
  border: 1px solid rgba(39, 56, 74, 0.4);
  padding: 20px 20px 22px;
  transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.page-about .about-team__unit:hover {
  box-shadow: 0 10px 26px rgba(8, 18, 28, 0.5);
  transform: translateY(-2px);
}
.page-about .about-team__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 34px;
  line-height: 1;
  color: var(--clay);
  border-bottom: 2px solid var(--grass);
  padding-bottom: 6px;
}
.page-about .about-team__name {
  margin: 14px 0 10px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--void);
}
.page-about .about-team__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: rgba(8, 18, 28, 0.78);
}

/* ---------- 引文块 ---------- */
.page-about .about-quote {
  display: block;
  margin: 26px 0 0;
  padding: 22px 20px 20px;
  background: var(--moss);
  border-left: 3px solid var(--score);
  text-decoration: none;
  transition: background-color var(--dur) var(--ease);
}
.page-about .about-quote:hover,
.page-about .about-quote:focus-visible {
  background: #4d5b3e;
}
.page-about .about-quote__text {
  display: block;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--bone);
}
.page-about .about-quote__more {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--score);
}
.page-about .about-quote__more::after {
  content: " \2192";
}

/* ---------- 收束索引 ---------- */
.page-about .about-outro {
  padding-top: 36px;
  padding-bottom: 72px;
  border-top: 1px solid var(--rule);
}
.page-about .about-outro__head {
  margin-bottom: 24px;
}
.page-about .about-outro__head .label {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--grass-bright);
  margin: 0 0 10px;
}
.page-about .about-outro__head h2 {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(22px, 4.6vw, 32px);
  letter-spacing: -0.015em;
  color: var(--bone);
}
.page-about .about-outro__head p {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--stone);
}

.page-about .about-outro__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}
.page-about .about-outro__link {
  display: block;
  background: var(--void);
  padding: 16px 18px 18px;
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.page-about .about-outro__link:hover,
.page-about .about-outro__link:focus-visible {
  background: #0d1a26;
  border-left-color: var(--score);
}
.page-about .about-outro__label {
  display: block;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
  color: var(--bone);
}
.page-about .about-outro__note {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__frame {
    padding: 40px 36px 34px;
  }
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-top: 32px;
  }
  .page-about .about-stats__cell {
    padding: 18px 16px 20px;
  }
  .page-about .about-stats__value {
    font-size: 30px;
  }
  .page-about .about-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 桌面长卷 ---------- */
@media (min-width: 900px) {
  .page-about .about-timeline {
    position: relative;
    padding-top: 64px;
  }
  .page-about .about-timeline::before {
    content: "";
    position: absolute;
    left: var(--about-line);
    top: 64px;
    bottom: 48px;
    width: 1px;
    background: var(--rule);
  }
  .page-about .about-chapter {
    padding-left: 148px;
    padding-bottom: 84px;
  }
  .page-about .about-chapter:last-child {
    padding-bottom: 40px;
  }
  .page-about .about-chapter__year {
    position: absolute;
    left: 0;
    top: 2px;
    width: 78px;
    text-align: right;
    margin: 0;
    background: transparent;
    color: var(--clay);
    padding: 0;
    font-size: 17px;
  }
  .page-about .about-chapter__dot {
    display: block;
    position: absolute;
    left: calc(var(--about-line) - 5px);
    top: 6px;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: var(--space);
    border: 1px solid var(--clay);
    box-shadow: 0 0 0 4px var(--space);
  }
  .page-about .milestone__extra {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    border-left-color: transparent;
    transition: max-height 0.22s var(--ease), opacity 0.22s var(--ease), margin-top 0.22s var(--ease),
      border-color 0.22s var(--ease);
  }
  .page-about .milestone:hover .milestone__extra,
  .page-about .milestone:focus-within .milestone__extra {
    max-height: 6em;
    opacity: 1;
    margin-top: 10px;
    border-left-color: var(--moss);
  }
  .page-about .about-outro__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-outro__link {
    padding: 20px 22px 22px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__frame {
    padding: 48px 48px 40px;
  }
  .page-about .about-chapter {
    padding-left: 168px;
  }
  .page-about .about-timeline::before {
    left: 112px;
  }
  .page-about .about-chapter__dot {
    left: 107px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .milestone,
  .page-about .about-team__unit,
  .page-about .about-quote,
  .page-about .about-outro__link {
    transition: background-color 0.01ms linear, border-color 0.01ms linear, color 0.01ms linear;
  }
  .page-about .about-team__unit:hover {
    transform: none;
  }
  .page-about .milestone__extra {
    transition: none;
  }
}
<<<END>>>