.page-about {
  background: var(--ink);
  color: var(--white);
  padding-bottom: clamp(48px, 7vw, 96px);
}

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

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 255, 61, 0.32);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about a:hover {
  border-bottom-color: var(--lime);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: clamp(16px, 3vw, 28px);
  padding: clamp(22px, 5vw, 56px);
  border: 1px solid var(--line);
  border-radius: 4px;
  background:
    linear-gradient(var(--line-soft) 1px, transparent 1px) 0 0 / 100% 58px,
    radial-gradient(circle at 88% 6%, var(--lime-soft), transparent 58%),
    var(--ink);
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-hero::before,
.page-about .about-hero::after {
  content: "";
  position: absolute;
  width: 20px;
  height: 20px;
  border: 2px solid var(--lime);
  pointer-events: none;
}

.page-about .about-hero::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-hero::after {
  bottom: -1px;
  right: -1px;
  border-left: 0;
  border-top: 0;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.2vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 14px 0 0;
  max-width: 19ch;
}

.page-about .about-hero .eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--lime);
  text-transform: uppercase;
  margin: 0;
}

.page-about .about-hero-lead {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: clamp(14.5px, 1.6vw, 16.5px);
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-marks {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-tile);
  overflow: hidden;
}

.page-about .about-marks li {
  padding: 16px 14px;
  background: rgba(18, 20, 19, 0.72);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .mark-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 4vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-about .mark-label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-faint);
}

@media (min-width: 860px) {
  .page-about .about-hero {
    grid-template-columns: 1.4fr 0.8fr;
    align-items: end;
  }
}

/* ---------- 主布局与年份侧轴 ---------- */
.page-about .about-layout {
  margin-top: clamp(36px, 6vw, 64px);
  display: grid;
  gap: 20px;
}

.page-about .rail-nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.page-about .rail-item {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--text-faint);
  background: rgba(18, 20, 19, 0.6);
  white-space: nowrap;
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.page-about .rail-item:hover {
  color: var(--white);
  border-color: var(--text-dim);
}

.page-about .rail-item[aria-current="true"] {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
}

@media (min-width: 900px) {
  .page-about .about-layout {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .rail-nav {
    flex-direction: column;
    overflow: visible;
    gap: 6px;
    padding: 0 0 0 14px;
    border-left: 1px solid var(--line);
  }

  .page-about .rail-item {
    border: 0;
    border-radius: 0;
    background: transparent;
    padding: 6px 0;
    justify-content: flex-start;
  }

  .page-about .rail-item[aria-current="true"] {
    background: transparent;
    color: var(--lime);
  }
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding-block: clamp(34px, 5.5vw, 66px);
  border-top: 1px solid var(--line-soft);
}

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

.page-about .chapter-index {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--lime);
  margin: 0;
}

.page-about .about-chapter h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.6vw, 38px);
  line-height: 1.16;
  margin: 12px 0 0;
  max-width: 22ch;
}

.page-about .about-chapter p {
  margin: 14px 0 0;
  max-width: 64ch;
  font-size: clamp(14.5px, 1.5vw, 16.5px);
  line-height: 1.85;
  color: var(--text-dim);
}

/* ---------- 图片 ---------- */
.page-about .about-fig {
  margin: clamp(22px, 3.5vw, 34px) 0 0;
}

.page-about .about-fig img {
  display: block;
  width: 100%;
  border-radius: var(--radius-tile);
  border: 1px solid var(--line);
  filter: saturate(0.9) contrast(1.05);
}

.page-about .about-fig figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--text-faint);
  letter-spacing: 0.02em;
}

@media (min-width: 860px) {
  .page-about .about-fig--wide {
    max-width: 100%;
  }
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: clamp(22px, 3.5vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .timeline li {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 14px;
  padding: 15px 14px;
  border-left: 2px solid rgba(200, 255, 61, 0.28);
  background: rgba(18, 20, 19, 0.55);
  border-radius: 0 var(--radius-tile) var(--radius-tile) 0;
  transition: background 0.22s ease, border-color 0.22s ease;
}

.page-about .timeline li:hover {
  background: rgba(200, 255, 61, 0.06);
  border-left-color: var(--lime);
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--lime);
  line-height: 1.5;
}

.page-about .tl-body strong {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 15.5px;
  color: var(--white);
  line-height: 1.5;
}

.page-about .tl-body span {
  display: block;
  margin-top: 5px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--text-dim);
}

@media (min-width: 780px) {
  .page-about .timeline li {
    grid-template-columns: 84px minmax(0, 1fr);
    padding: 18px 20px;
  }

  .page-about .timeline li:nth-child(even) {
    margin-left: 44px;
  }

  .page-about .timeline li:nth-child(odd) {
    margin-right: 44px;
  }
}

/* ---------- 团队战术板 ---------- */
.page-about .team-board {
  margin: clamp(24px, 4vw, 34px) 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .team-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 16px 14px 18px;
  background: var(--cream);
  color: var(--brown);
  border: 1px solid var(--brown);
  border-radius: 6px;
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.34);
  transition: transform 0.24s ease, box-shadow 0.24s ease, background 0.24s ease;
}

.page-about .team-card::before {
  content: "";
  position: absolute;
  top: 10px;
  right: 10px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 3px rgba(200, 255, 61, 0.22);
}

.page-about .team-card:hover {
  transform: translateY(-3px);
  box-shadow: 6px 7px 0 rgba(0, 0, 0, 0.4);
  background: #f6efdd;
}

.page-about .team-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--brown);
}

.page-about .team-role {
  margin-top: 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--brown);
}

.page-about .team-duty {
  margin-top: 8px;
  font-size: 12.8px;
  line-height: 1.72;
  color: rgba(42, 31, 25, 0.76);
}

@media (min-width: 760px) {
  .page-about .team-board {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .team-card:nth-child(2),
  .page-about .team-card:nth-child(4) {
    margin-top: 22px;
  }
}

/* ---------- 覆盖数字 ---------- */
.page-about .cover-strip {
  list-style: none;
  margin: clamp(22px, 3.5vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-tile);
  overflow: hidden;
}

.page-about .cover-strip li {
  background: rgba(18, 20, 19, 0.78);
  padding: 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .cover-num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 5vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--white);
}

.page-about .cover-plus {
  color: var(--lime);
}

.page-about .cover-label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-faint);
}

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

/* ---------- 生态连线图 ---------- */
.page-about .eco-map {
  position: relative;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: rgba(11, 31, 23, 0.6);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .eco-lines {
  display: none;
}

.page-about .eco-hub {
  order: -1;
  padding: 14px 10px;
  text-align: center;
  background: var(--lime);
  color: var(--ink);
  border-radius: var(--radius-tile);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 15px;
  letter-spacing: 0.05em;
}

.page-about .eco-node {
  padding: 11px 12px;
  text-align: center;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: var(--charcoal);
  transition: color 0.22s ease, background 0.22s ease, border-color 0.22s ease;
}

.page-about .eco-node:hover {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .eco-note {
  font-size: 13.5px;
  color: var(--text-faint);
}

@media (min-width: 760px) {
  .page-about .eco-map {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    grid-template-areas:
      "n1 n2 n3"
      "n4 hub n5";
    gap: 14px;
    padding: 26px;
  }

  .page-about .eco-lines {
    display: block;
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
  }

  .page-about .eco-lines line {
    stroke: rgba(200, 255, 61, 0.3);
    stroke-width: 1;
    stroke-dasharray: 4 4;
  }

  .page-about .eco-hub {
    grid-area: hub;
    order: 0;
    display: grid;
    place-items: center;
    font-size: 16px;
    position: relative;
    z-index: 1;
  }

  .page-about .eco-node {
    position: relative;
    z-index: 1;
  }

  .page-about .eco-n1 { grid-area: n1; }
  .page-about .eco-n2 { grid-area: n2; }
  .page-about .eco-n3 { grid-area: n3; }
  .page-about .eco-n4 { grid-area: n4; }
  .page-about .eco-n5 { grid-area: n5; }
}

/* ---------- 主体信息卡 ---------- */
.page-about .about-facts {
  margin: clamp(22px, 3.5vw, 32px) 0 0;
  padding: clamp(20px, 3.5vw, 34px);
  background: var(--cream);
  color: var(--brown);
  border: 1px solid var(--brown);
  border-radius: var(--radius-card);
  box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.36);
}

.page-about .about-facts dl {
  margin: 0;
  display: grid;
  gap: 16px;
}

.page-about .fact-row dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: rgba(42, 31, 25, 0.62);
}

.page-about .fact-row dd {
  margin: 5px 0 0;
  font-size: 15px;
  line-height: 1.66;
  color: var(--brown);
  word-break: break-word;
}

.page-about .fact-foot {
  margin: 22px 0 0;
  padding-top: 14px;
  border-top: 1px dashed rgba(42, 31, 25, 0.28);
  font-size: 13px;
  line-height: 1.75;
  color: rgba(42, 31, 25, 0.75);
}

.page-about .about-facts a {
  color: var(--brown);
  border-bottom-color: rgba(42, 31, 25, 0.42);
}

.page-about .about-facts a:hover {
  border-bottom-color: var(--brown);
}

@media (min-width: 700px) {
  .page-about .about-facts dl {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 28px;
  }

  .page-about .fact-row--wide {
    grid-column: span 2;
  }
}

/* ---------- 下一步入口 ---------- */
.page-about .about-next {
  margin-top: clamp(48px, 7vw, 84px);
  padding-top: clamp(26px, 4vw, 40px);
  border-top: 1px solid var(--line);
}

.page-about .next-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(21px, 3.2vw, 30px);
  line-height: 1.2;
  margin: 0 0 clamp(18px, 3vw, 26px);
}

.page-about .next-grid {
  display: grid;
  gap: 12px;
}

.page-about .next-card {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 18px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-tile);
  background: var(--charcoal);
  color: var(--white);
  border-bottom: 1px solid var(--line);
  transition: border-color 0.22s ease, transform 0.22s ease, background 0.22s ease;
}

.page-about .next-card:hover {
  border-color: var(--lime);
  transform: translateY(-3px);
  background: rgba(200, 255, 61, 0.06);
  border-bottom-color: var(--lime);
}

.page-about .next-tag {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  padding: 3px 9px;
  border-radius: var(--radius-pill);
  background: rgba(200, 255, 61, 0.14);
  color: var(--lime);
}

.page-about .next-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  color: var(--white);
}

.page-about .next-desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-faint);
}

@media (min-width: 640px) {
  .page-about .next-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-about .next-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
<<<END>>>