.page-about {
  --about-gap: clamp(24px, 3vw, 44px);
  --about-rule: 1px solid var(--line);
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: clamp(16px, 2.4vw, 28px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(22px, 3.6vw, 48px) clamp(30px, 4.4vw, 60px);
  border-bottom: var(--about-rule);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, rgba(46, 74, 64, 0.5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(46, 74, 64, 0.5) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(115% 95% at 88% 0%, #000 0%, transparent 72%);
  mask-image: radial-gradient(115% 95% at 88% 0%, #000 0%, transparent 72%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  top: -46%;
  width: 46vw;
  height: 46vw;
  max-width: 520px;
  max-height: 520px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(198, 255, 61, 0.11), transparent 68%);
  z-index: -1;
  pointer-events: none;
}

.page-about .about-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .about-hero__dot {
  width: 8px;
  height: 8px;
  background: var(--lime);
  display: inline-block;
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-size: clamp(32px, 6.2vw, 72px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  max-width: 15em;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.78;
  color: var(--paper);
}

.page-about .about-hero__meta {
  list-style: none;
  margin: 26px 0 0;
  padding: 18px 0 0;
  border-top: var(--about-rule);
  max-width: 760px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
}

.page-about .about-hero__meta li {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.page-about .about-hero__meta .mono {
  margin-right: 6px;
  font-size: 15px;
  color: var(--lime);
}

/* ---------- 主布局 ---------- */
.page-about .about-layout {
  display: grid;
  gap: var(--block);
  padding-block: clamp(32px, 5vw, 64px) clamp(44px, 6vw, 96px);
}

/* ---------- 章节索引 ---------- */
.page-about .about-toc {
  border-top: 2px solid var(--lime);
  padding-top: 16px;
  align-self: start;
}

.page-about .about-toc__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-toc__link {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 9px 10px;
  border-left: 2px solid transparent;
  color: var(--paper);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.4;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  background: var(--panel-2);
  border-left-color: var(--lime);
  color: var(--lime);
}

.page-about .about-toc__num {
  font-size: 12px;
  color: var(--lime);
  letter-spacing: 0.04em;
}

.page-about .about-toc__note {
  margin: 0 0 18px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-toc__btn {
  width: 100%;
  justify-content: center;
}

/* ---------- 章节 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(48px, 6vw, 88px);
  min-width: 0;
}

.page-about .about-chapter {
  scroll-margin-top: 96px;
  min-width: 0;
}

.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0 16px;
  align-items: baseline;
  border-top: 2px solid var(--line);
  padding-top: 18px;
  margin-bottom: 22px;
}

.page-about .about-chapter__num {
  grid-row: span 2;
  font-size: clamp(26px, 4vw, 40px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--lime);
  opacity: 0.85;
}

.page-about .about-chapter__title {
  margin: 0;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.26;
  letter-spacing: -0.01em;
}

.page-about .about-chapter__kicker {
  margin: 8px 0 0;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.6;
}

.page-about .about-chapter__body {
  max-width: 66ch;
}

.page-about .about-chapter__body p {
  margin: 0 0 16px;
  line-height: 1.8;
}

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

/* ---------- 大事记 ---------- */
.page-about .about-track {
  list-style: none;
  margin: 28px 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-track__item {
  position: relative;
  padding: 22px 0 22px 26px;
  border-left: 2px solid var(--line);
  transition: border-color 0.25s ease, background-color 0.25s ease;
}

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 28px;
  width: 12px;
  height: 12px;
  background: var(--ink);
  border: 2px solid var(--line);
  transition: background-color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.page-about .about-track__item:hover {
  background: linear-gradient(90deg, rgba(14, 42, 34, 0.75), rgba(14, 42, 34, 0));
  border-left-color: var(--lime);
}

.page-about .about-track__item:hover::before {
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .about-track__item[data-state="current"] {
  border-left-color: var(--lime);
}

.page-about .about-track__item[data-state="current"]::before {
  background: var(--lime);
  border-color: var(--lime);
  box-shadow: 0 0 0 4px rgba(198, 255, 61, 0.15);
}

.page-about .about-track__ver {
  display: inline-block;
  margin-bottom: 8px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-track__title {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.4;
}

.page-about .about-track__text {
  margin: 0;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 五级目录 ---------- */
.page-about .about-ladder {
  list-style: none;
  margin: 26px 0;
  padding: 0;
  border-top: var(--about-rule);
}

.page-about .about-ladder__row {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 2px 14px;
  align-items: baseline;
  padding: 14px 12px;
  border-bottom: var(--about-rule);
  background: linear-gradient(90deg, rgba(14, 42, 34, 0.72), rgba(14, 42, 34, 0));
  transition: background-color 0.2s ease;
}

.page-about .about-ladder__row:hover {
  background: var(--panel-2);
}

.page-about .about-ladder__num {
  grid-column: 1;
  grid-row: 1;
  font-size: 12px;
  color: var(--lime);
  letter-spacing: 0.08em;
}

.page-about .about-ladder__label {
  grid-column: 2;
  grid-row: 1;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .about-ladder__desc {
  grid-column: 2;
  grid-row: 2;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 数据块 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 26px 0;
  background: var(--line);
  border: var(--about-rule);
}

.page-about .about-stats__cell {
  background: var(--panel);
  padding: 18px 16px;
}

.page-about .about-stats__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1;
  color: var(--lime);
  letter-spacing: -0.02em;
}

.page-about .about-stats__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 提示卡 ---------- */
.page-about .about-callout {
  margin: 24px 0;
  padding: 16px 18px;
  border-left: 3px solid var(--amber);
  background: var(--panel-2);
}

.page-about .about-callout__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--paper);
}

.page-about .about-link {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 255, 61, 0.4);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  border-bottom-color: var(--lime);
  color: var(--amber);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 28px 0 0;
}

.page-about .about-figure .figure__frame {
  border: var(--about-rule);
  background: var(--panel);
  overflow: hidden;
}

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

.page-about .about-figure .figure__caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  margin-top: 26px;
}

.page-about .about-filter {
  margin-bottom: 18px;
}

.page-about .about-team__grid {
  margin-bottom: 0;
}

.page-about .about-role {
  border-left: 2px solid var(--lime);
  background: var(--panel);
  padding: 18px 18px 20px;
}

.page-about .about-role .card__kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-role__count {
  margin: 0 0 6px;
  font-size: 30px;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-role .card__title {
  margin: 0 0 8px;
  font-size: 17px;
}

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

/* ---------- 流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 26px 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: var(--about-rule);
}

.page-about .about-flow__step {
  background: var(--panel);
  padding: 16px 18px;
  display: grid;
  gap: 4px;
}

.page-about .about-flow__idx {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-flow__name {
  font-size: 16px;
  letter-spacing: 0.01em;
}

.page-about .about-flow__desc {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco__wall {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.page-about .about-eco__chip {
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 16px 16px 18px;
  background: var(--panel);
  border-left: 6px solid var(--line);
}

.page-about .about-eco__chip::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    90deg,
    rgba(244, 247, 242, 0.07) 0 2px,
    transparent 2px 7px
  );
  opacity: 0.55;
}

.page-about .about-eco__chip--blue { border-left-color: var(--tag-blue); }
.page-about .about-eco__chip--purple { border-left-color: var(--tag-purple); }
.page-about .about-eco__chip--clay { border-left-color: var(--tag-clay); }
.page-about .about-eco__chip--lime { border-left-color: var(--lime); }

.page-about .about-eco__count {
  font-size: 26px;
  line-height: 1;
  color: var(--paper);
  letter-spacing: -0.02em;
}

.page-about .about-eco__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-steps {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.page-about .about-steps__item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 14px;
  background: var(--panel-2);
  border-top: 2px solid var(--line);
  font-size: 14px;
  transition: border-color 0.2s ease;
}

.page-about .about-steps__item:hover {
  border-top-color: var(--amber);
}

.page-about .about-steps__num {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .about-note-line {
  margin: 16px 0 0;
  color: var(--muted);
  line-height: 1.8;
}

.page-about .about-quote {
  margin: 30px 0 10px;
  padding: 6px 0 6px 20px;
  border-left: 3px solid var(--amber);
  font-family: var(--font-serif);
  font-size: clamp(17px, 2.2vw, 22px);
  line-height: 1.72;
  color: var(--paper);
}

.page-about .about-quote__meta {
  margin: 0;
  color: var(--muted);
}

/* ---------- 联系与承诺 ---------- */
.page-about .about-support {
  display: grid;
  gap: 16px;
  margin-top: 26px;
}

.page-about .about-support__panel {
  border: var(--about-rule);
  background: var(--panel);
  padding: clamp(18px, 3vw, 28px);
}

.page-about .about-support__panel--alt {
  background: var(--panel-2);
}

.page-about .about-support__title {
  margin: 0 0 14px;
  font-size: 17px;
  line-height: 1.4;
}

.page-about .about-support__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-support__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-support__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  background: var(--lime);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-ladder__row {
    grid-template-columns: 52px 132px minmax(0, 1fr);
    align-items: center;
    gap: 0 18px;
    padding: 16px 16px;
  }

  .page-about .about-ladder__label {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-ladder__desc {
    grid-column: 3;
    grid-row: 1;
  }

  .page-about .about-support {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .about-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    border-top: 2px solid var(--line);
    margin-top: 32px;
  }

  .page-about .about-track__item {
    border-left: 0;
    padding: 28px 20px 8px 0;
  }

  .page-about .about-track__item::before {
    left: 0;
    top: -8px;
  }

  .page-about .about-track__item:hover {
    background: linear-gradient(180deg, rgba(14, 42, 34, 0.7), rgba(14, 42, 34, 0));
  }

  .page-about .about-track__text {
    max-width: 26ch;
  }
}

@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 72px);
    align-items: start;
  }

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

  .page-about .about-support {
    grid-template-columns: 1.15fr 0.85fr;
  }
}

@media (min-width: 1220px) {
  .page-about .about-layout {
    grid-template-columns: 260px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__link,
  .page-about .about-track__item,
  .page-about .about-track__item::before,
  .page-about .about-steps__item {
    transition: none;
  }
}
<<<END>>>