.page-about {
  --about-side: 220px;
  --about-measure: 68ch;
  background: var(--ink);
  color: var(--bone);
}

.page-about .about-crumb {
  padding-top: clamp(14px, 3vw, 24px);
  background: var(--deep);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 52px) 0 clamp(36px, 6vw, 72px);
  background:
    radial-gradient(90% 130% at 6% -20%, rgba(18, 60, 49, 0.92) 0%, rgba(11, 42, 34, 0.42) 46%, rgba(14, 18, 16, 0) 74%),
    linear-gradient(168deg, var(--deep) 0%, var(--ink) 82%);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero h1 {
  margin: clamp(12px, 2vw, 20px) 0 clamp(16px, 3vw, 26px);
  max-width: 24ch;
  font-family: var(--font-display);
  font-size: clamp(2rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--bone);
}

.page-about .about-hero__lede {
  max-width: 60ch;
  margin: 0;
  font-size: clamp(0.95rem, 2.1vw, 1.0625rem);
  line-height: 1.85;
  color: rgba(245, 241, 230, 0.78);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 3.2vw, 30px);
  margin: clamp(26px, 5vw, 46px) 0 0;
  padding-top: clamp(20px, 3.6vw, 32px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-stat dt {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-stat dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.page-about .about-stat__num {
  font-size: clamp(1.55rem, 4.2vw, 2.3rem);
  font-weight: 700;
  color: var(--lime);
}

.page-about .about-stat__unit {
  font-size: 12px;
  color: var(--mist);
}

/* ---------- 层叠目录主体 ---------- */
.page-about .about-body {
  padding: clamp(36px, 6vw, 88px) 0 clamp(48px, 8vw, 110px);
  background: linear-gradient(180deg, var(--ink) 0%, #101614 100%);
}

.page-about .about-body .shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .about-index {
  border-top: 1px solid var(--line);
  padding-top: 14px;
  min-width: 0;
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__link {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 15px;
  border: 1px solid var(--line-soft);
  border-radius: var(--pill);
  font-size: 13px;
  line-height: 1.3;
  white-space: nowrap;
  text-decoration: none;
  color: var(--mist);
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--steel);
  transition: color 0.25s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--bone);
  border-color: var(--lime-deep);
  background: rgba(200, 255, 61, 0.08);
  outline: none;
}

.page-about .about-index__link:hover .about-index__num,
.page-about .about-index__link:focus-visible .about-index__num {
  color: var(--lime);
}

.page-about .about-main {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  scroll-margin-top: 92px;
  padding-top: clamp(14px, 2.4vw, 22px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-chapter + .about-chapter {
  margin-top: clamp(42px, 7vw, 84px);
}

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 10px;
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 4vw, 2.35rem);
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--lime);
}

.page-about .about-chapter__en {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-about .about-chapter h2 {
  margin: 0 0 clamp(14px, 2.4vw, 22px);
  max-width: 22ch;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3.4vw, 2.05rem);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--bone);
}

.page-about .about-chapter p {
  margin: 0 0 1.05em;
  max-width: var(--about-measure);
  font-size: clamp(0.95rem, 2.1vw, 1.05rem);
  line-height: 1.85;
  color: rgba(245, 241, 230, 0.8);
}

/* ---------- 图 ---------- */
.page-about .about-figure {
  margin: clamp(20px, 3.6vw, 32px) 0 0;
  border-radius: var(--r-md);
  border: 1px solid var(--line-soft);
  background: var(--deep-2);
  overflow: hidden;
}

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

.page-about .about-figure figcaption {
  padding: 12px 16px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--mist);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-figure--archive {
  border-color: rgba(230, 161, 90, 0.3);
  background: linear-gradient(160deg, #1b1510 0%, var(--ink) 100%);
}

.page-about .about-figure--archive figcaption {
  border-top-color: rgba(230, 161, 90, 0.22);
  color: rgba(230, 161, 90, 0.85);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0 0 0 clamp(16px, 3vw, 24px);
  border-left: 1px solid rgba(230, 161, 90, 0.36);
  display: grid;
  gap: 16px;
}

.page-about .about-timeline__item {
  position: relative;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: 6px;
  left: calc(clamp(16px, 3vw, 24px) * -1 - 5px);
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 3px rgba(200, 255, 61, 0.14);
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .about-timeline__item p {
  margin: 4px 0 0;
  max-width: 56ch;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(245, 241, 230, 0.74);
}

/* ---------- 技能树 ---------- */
.page-about .skill-tree {
  list-style: none;
  margin: clamp(22px, 3.8vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .skill-node {
  position: relative;
  padding: 16px 18px 16px 52px;
  border-radius: var(--r-md);
  border: 1px solid var(--line-soft);
  background: linear-gradient(150deg, rgba(18, 60, 49, 0.58) 0%, rgba(14, 18, 16, 0.5) 100%);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .skill-node:hover,
.page-about .skill-node:focus-within {
  transform: translateY(-3px);
  border-color: rgba(200, 255, 61, 0.42);
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.32);
}

.page-about .skill-node__dot {
  position: absolute;
  top: 22px;
  left: 20px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(200, 255, 61, 0.12);
}

.page-about .skill-node:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 38px;
  bottom: -14px;
  left: 25.5px;
  width: 1px;
  background: linear-gradient(180deg, rgba(200, 255, 61, 0.5) 0%, rgba(200, 255, 61, 0.06) 100%);
}

.page-about .skill-node h3 {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--bone);
}

.page-about .skill-node p {
  margin: 0;
  max-width: 54ch;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(245, 241, 230, 0.58);
  transition: color 0.3s var(--ease);
}

.page-about .skill-node:hover p,
.page-about .skill-node:focus-within p {
  color: rgba(245, 241, 230, 0.88);
}

/* ---------- 团队 ---------- */
.page-about .team-roster {
  list-style: none;
  margin: clamp(20px, 3.6vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .team-role {
  padding: 18px;
  border-radius: var(--r-md);
  border: 1px solid var(--line-soft);
  background: rgba(18, 60, 49, 0.26);
}

.page-about .team-role__count {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 4.4vw, 2.3rem);
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--lime);
}

.page-about .team-role__name {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .team-role p {
  margin: 10px 0 0;
  max-width: none;
  font-size: 13.5px;
  line-height: 1.72;
  color: rgba(245, 241, 230, 0.72);
}

/* ---------- 档案 ---------- */
.page-about .archive-metrics {
  display: grid;
  gap: 12px;
  margin: clamp(20px, 3.6vw, 30px) 0 0;
}

.page-about .archive-metric {
  padding: 18px 20px;
  border-radius: var(--r-md);
  border: 1px solid rgba(230, 161, 90, 0.28);
  background: linear-gradient(150deg, rgba(230, 161, 90, 0.1) 0%, rgba(14, 18, 16, 0.4) 100%);
}

.page-about .archive-metric strong {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4.2vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--amber);
}

.page-about .archive-metric span {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(245, 241, 230, 0.72);
}

.page-about .archive-metric p {
  margin: 8px 0 0;
  max-width: none;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(245, 241, 230, 0.62);
}

/* ---------- 联系 ---------- */
.page-about .about-contact {
  margin-top: clamp(24px, 4.4vw, 40px);
  padding: clamp(20px, 3.6vw, 32px);
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: linear-gradient(155deg, rgba(18, 60, 49, 0.6) 0%, rgba(14, 18, 16, 0.75) 100%);
}

.page-about .about-contact__title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-about .about-kv {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-kv__row {
  display: grid;
  gap: 4px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .about-kv dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .about-kv dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--bone);
  word-break: break-word;
}

.page-about .about-kv dd a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 255, 61, 0.35);
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .about-kv dd a:hover,
.page-about .about-kv dd a:focus-visible {
  color: var(--glow);
  border-bottom-color: var(--glow);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(18px, 3vw, 26px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .archive-metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .skill-node {
    padding: 20px 24px 20px 56px;
  }

  .page-about .about-kv__row {
    grid-template-columns: 108px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }
}

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-body .shell {
    grid-template-columns: var(--about-side) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
  }

  .page-about .about-index {
    position: sticky;
    top: 88px;
  }

  .page-about .about-index__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__list li + li {
    margin-top: 2px;
  }

  .page-about .about-index__link {
    border: 0;
    border-left: 1px solid var(--line-soft);
    border-radius: 0;
    padding: 9px 0 9px 16px;
    white-space: normal;
    font-size: 13.5px;
    background: none;
    transition: color 0.25s var(--ease), border-color 0.25s var(--ease), padding-left 0.25s var(--ease);
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    padding-left: 20px;
    border-left-color: var(--lime);
    background: none;
  }
}

@media (min-width: 1080px) {
  .page-about .about-chapter h2 {
    max-width: 24ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .skill-node,
  .page-about .skill-node p,
  .page-about .about-index__link {
    transition: none;
  }

  .page-about .skill-node:hover,
  .page-about .skill-node:focus-within {
    transform: none;
    box-shadow: none;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    padding-left: 16px;
  }
}
<<<END>>>