.page-about {
  --about-gap: clamp(20px, 3vw, 36px);
  --about-band-pad: clamp(18px, 2.6vw, 30px);
  background: var(--paper);
  color: var(--ink);
}

/* ---------- 开篇 ---------- */
.page-about .about-masthead {
  position: relative;
  padding: clamp(22px, 3.6vw, 40px) 0 clamp(32px, 5vw, 60px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-masthead::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    45deg,
    rgba(47, 107, 79, 0.06) 0 1px,
    transparent 1px 10px
  );
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 72%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 72%);
}

.page-about .about-masthead-grid {
  position: relative;
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(14px, 2vw, 22px);
}

.page-about .about-kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--stone);
  text-transform: uppercase;
}

.page-about h1 {
  margin: 0;
  font-family: var(--font-cn);
  font-size: var(--fs-h1);
  font-weight: 900;
  font-stretch: condensed;
  line-height: 0.98;
  letter-spacing: -0.025em;
  max-width: 13em;
}

.page-about .about-lead {
  margin: clamp(14px, 2vw, 22px) 0 0;
  max-width: 40em;
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.76;
  color: #322c25;
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(20px, 2.8vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 12px 14px;
  background: var(--card);
}

.page-about .about-fact-num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.035em;
  color: var(--grass);
}

.page-about .about-fact-label {
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--stone);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  background: var(--card);
  border-bottom: 1px solid var(--line);
}

.page-about .about-index-list {
  list-style: none;
  margin: 0;
  padding: 10px 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-index-link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-about .about-index-link:hover,
.page-about .about-index-link:focus-visible {
  border-color: var(--grass-2);
  background: var(--ink-soft);
}

.page-about .about-index-num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--grass-2);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding-block: clamp(44px, 6vw, 88px);
}

.page-about .about-band {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 2.6vw, 34px);
  align-items: start;
  padding: var(--about-band-pad) clamp(18px, 3vw, 36px);
  background: var(--grass);
  color: var(--card);
  border-left: 6px solid var(--neon);
  overflow: hidden;
}

.page-about .about-band::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    45deg,
    rgba(198, 242, 78, 0.07) 0 1px,
    transparent 1px 12px
  );
}

.page-about .about-band-num {
  position: relative;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.4vw, 54px);
  font-weight: 700;
  line-height: 0.92;
  letter-spacing: -0.05em;
  color: var(--neon);
}

.page-about .about-band-title {
  position: relative;
  margin: 0;
  font-size: var(--fs-h2);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--card);
}

.page-about .about-band-lead {
  position: relative;
  margin: 10px 0 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.66;
  color: rgba(252, 249, 242, 0.78);
}

.page-about .about-body {
  margin-top: clamp(24px, 3.4vw, 40px);
}

.page-about .about-split {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-text > p {
  margin: 0 0 1em;
  font-size: var(--fs-body);
  line-height: 1.78;
  color: #2a241e;
}

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

.page-about .about-num {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--grass);
}

.page-about .about-link {
  color: var(--grass);
  text-decoration: underline;
  text-decoration-color: var(--grass-2);
  text-underline-offset: 3px;
}

.page-about .about-link:hover {
  color: var(--grass-2);
}

.page-about .about-tail {
  margin: clamp(20px, 2.6vw, 28px) 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.75;
  color: var(--stone);
}

/* ---------- 侧注 ---------- */
.page-about .about-aside {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--grass-2);
  background: var(--card);
  box-shadow: var(--shadow);
}

.page-about .about-aside-note {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--stone);
}

.page-about .about-aside-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
  font-size: 14px;
  line-height: 1.6;
  color: #322c25;
}

.page-about .about-aside-list li {
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--line);
}

.page-about .about-aside-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

/* ---------- 团队构成 ---------- */
.page-about .about-team-bar {
  display: flex;
  height: 58px;
  border: 1px solid var(--ink);
  overflow: hidden;
  margin-bottom: 18px;
}

.page-about .about-seg {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--card);
  transition: filter 180ms var(--ease);
}

.page-about .about-seg:hover {
  filter: brightness(1.14);
}

.page-about .about-seg--a { flex: 0 0 45%; background: #0e3b2a; }
.page-about .about-seg--b { flex: 0 0 22.5%; background: #2f6b4f; }
.page-about .about-seg--c { flex: 0 0 15%; background: #6e6459; }
.page-about .about-seg--d { flex: 0 0 17.5%; background: #c6f24e; color: #0e3b2a; }

.page-about .about-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-legend-item {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr);
  gap: 12px;
  padding: 14px 16px;
  background: var(--card);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  transition: transform 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-legend-item:hover,
.page-about .about-legend-item:focus-within {
  transform: translateY(-2px);
  border-color: var(--grass-2);
}

.page-about .about-legend-swatch {
  width: 14px;
  height: 14px;
  margin-top: 5px;
  border-radius: 50%;
}

.page-about .about-swatch--a { background: #0e3b2a; }
.page-about .about-swatch--b { background: #2f6b4f; }
.page-about .about-swatch--c { background: #6e6459; }
.page-about .about-swatch--d { background: #c6f24e; border: 1px solid #0e3b2a; }

.page-about .about-legend-title {
  margin: 0 0 4px;
  font-size: 15.5px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-legend-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.68;
  color: var(--stone);
}

/* ---------- 三审流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-step {
  position: relative;
  padding: 18px 18px 22px;
  background: var(--card);
  border: 1px solid var(--line);
  border-top: 3px solid var(--grass-2);
  box-shadow: var(--shadow);
  transition: transform 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .about-step:hover {
  transform: translateY(-2px);
  border-color: var(--grass-2);
}

.page-about .about-step-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.05em;
  color: rgba(47, 107, 79, 0.26);
}

.page-about .about-step-title {
  margin: 10px 0 6px;
  font-size: var(--fs-h3);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--stone);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
  border-left: 2px solid var(--grass-2);
}

.page-about .about-tl {
  position: relative;
  padding-bottom: clamp(24px, 3.2vw, 38px);
}

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

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: -37px;
  top: 7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--grass-2);
}

.page-about .about-tl--now::before {
  background: var(--neon);
  border-color: var(--grass);
  box-shadow: 0 0 0 4px rgba(198, 242, 78, 0.28);
}

.page-about .about-tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.035em;
  color: var(--grass);
}

.page-about .about-tl-title {
  margin: 8px 0 6px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-h3);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-tl-ver {
  display: inline-block;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  background: var(--grass);
  color: var(--neon);
}

.page-about .about-tl-desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.74;
  color: #322c25;
}

.page-about .about-tl-more {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
}

.page-about .about-tl-more summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  list-style: none;
  cursor: pointer;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--grass-2);
}

.page-about .about-tl-more summary::-webkit-details-marker {
  display: none;
}

.page-about .about-tl-more summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1;
}

.page-about .about-tl-more[open] summary::before {
  content: "−";
}

.page-about .about-tl-more summary:focus-visible {
  outline: 2px solid var(--grass-2);
  outline-offset: 3px;
}

.page-about .about-tl-list {
  margin: 10px 0 0;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--stone);
}

.page-about .about-tl-list li {
  margin-bottom: 4px;
}

.page-about .about-tl-list li:last-child {
  margin-bottom: 0;
}

/* ---------- 覆盖规模 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(16px, 2.2vw, 22px);
  background: var(--card);
}

.page-about .about-stat--dark {
  background: var(--grass);
}

.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.6vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.045em;
  color: var(--grass);
}

.page-about .about-stat-num small {
  margin-left: 4px;
  font-family: var(--font-cn);
  font-size: 0.4em;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--stone);
}

.page-about .about-stat-label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--stone);
}

.page-about .about-stat--dark .about-stat-num {
  color: var(--neon);
}

.page-about .about-stat--dark .about-stat-label {
  color: rgba(252, 249, 242, 0.78);
}

/* ---------- 合作区 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 22px;
  padding: clamp(22px, 3vw, 34px);
  background: var(--ink);
  color: var(--card);
  border-left: 6px solid var(--neon);
}

.page-about .about-cta-title {
  margin: 0 0 10px;
  font-size: var(--fs-h3);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--card);
}

.page-about .about-cta-text {
  margin: 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.74;
  color: var(--ink-mute);
}

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

.page-about .about-cta-ghost {
  color: var(--card);
  border-color: rgba(252, 249, 242, 0.42);
}

.page-about .about-cta-ghost:hover {
  border-color: var(--neon);
  color: var(--neon);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
  background: var(--card);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.page-about .about-figure .figure-media {
  overflow: hidden;
  background: var(--grass);
}

.page-about .about-figure--masthead .figure-media { aspect-ratio: 7 / 4; }
.page-about .about-figure--version .figure-media { aspect-ratio: 4 / 3; }
.page-about .about-figure--flow .figure-media { aspect-ratio: 10 / 7; }

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

.page-about .about-figure figcaption {
  padding: 10px 14px;
  font-size: 12.5px;
  line-height: 1.62;
  color: var(--stone);
  border-top: 1px solid var(--line);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-legend {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-masthead-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr);
  }

  .page-about .about-timeline {
    padding-left: 38px;
  }

  .page-about .about-tl::before {
    left: -45px;
  }

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

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

@media (min-width: 1080px) {
  .page-about .about-band {
    padding-right: clamp(36px, 5vw, 64px);
  }

  .page-about .about-tl {
    padding-right: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-step,
  .page-about .about-legend-item,
  .page-about .about-seg,
  .page-about .about-index-link {
    transition: none;
  }

  .page-about .about-step:hover,
  .page-about .about-legend-item:hover {
    transform: none;
  }
}
<<<END>>>