.page-about {
  --about-toc-w: 178px;
  --about-radius: 0;
  background: var(--abyss);
  color: var(--text);
  font-family: var(--font-body);
}

/* ---------- 首屏框景 ---------- */

.page-about .about-masthead {
  position: relative;
  padding: 26px 0 54px;
  overflow: hidden;
  background:
    radial-gradient(120% 90% at 84% -12%, rgba(53, 224, 208, 0.13), transparent 58%),
    radial-gradient(95% 70% at 4% 108%, rgba(255, 107, 74, 0.15), transparent 62%);
}

.page-about .breadcrumb {
  margin-bottom: 22px;
}

.page-about .masthead-frame {
  position: relative;
  padding: 26px 18px 22px;
  border: 1px solid var(--line-strong);
  background: linear-gradient(158deg, rgba(11, 42, 63, 0.94) 0%, rgba(6, 24, 38, 0.97) 62%);
  clip-path: polygon(26px 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%, 0 26px);
}

.page-about .masthead-frame::before {
  content: "";
  position: absolute;
  top: 20px;
  right: 18px;
  width: 1px;
  height: 72px;
  background: repeating-linear-gradient(180deg, var(--mist) 0 6px, transparent 6px 13px);
  opacity: 0.45;
}

.page-about .masthead-index {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .masthead-index::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--coral);
}

.page-about .masthead-title {
  margin: 0 0 18px;
  max-width: 20ch;
  font-family: var(--font-display);
  font-size: clamp(30px, 7.4vw, 60px);
  font-weight: 200;
  line-height: 1.16;
  letter-spacing: -0.012em;
  color: var(--foam);
}

.page-about .masthead-title em {
  font-style: normal;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--coral);
}

.page-about .masthead-lede {
  margin: 0 0 26px;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
}

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

.page-about .masthead-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 12px 16px;
  background: rgba(6, 24, 38, 0.9);
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: 21px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--foam);
}

.page-about .stat-label {
  font-size: 12px;
  line-height: 1.55;
  color: var(--mist);
}

/* ---------- 主体栅格 ---------- */

.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding-top: 6px;
  padding-bottom: 72px;
}

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

/* ---------- 章节索引 ---------- */

.page-about .about-toc {
  padding: 8px 0 4px;
}

.page-about .toc-label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

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

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

.page-about .toc-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  color: var(--text-dim);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .toc-list a:hover,
.page-about .toc-list a:focus-visible {
  color: var(--foam);
  border-color: var(--coral);
}

.page-about .toc-num {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--coral);
}

/* ---------- 章节 ---------- */

.page-about .chapter {
  position: relative;
  padding: 34px 0 10px;
  scroll-margin-top: 24px;
}

.page-about .chapter-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  margin-bottom: 20px;
}

.page-about .chapter-num {
  font-family: var(--font-mono);
  font-size: clamp(38px, 10vw, 66px);
  font-weight: 200;
  line-height: 0.82;
  letter-spacing: -0.03em;
  color: rgba(185, 214, 228, 0.22);
}

.page-about .chapter-heading {
  min-width: 0;
}

.page-about .chapter-heading .tag {
  display: inline-block;
  margin-bottom: 10px;
}

.page-about .chapter h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 4.8vw, 30px);
  font-weight: 300;
  line-height: 1.38;
  letter-spacing: -0.008em;
  color: var(--foam);
}

.page-about .chapter-lede {
  margin: 0 0 22px;
  padding-left: 14px;
  border-left: 3px solid var(--coral);
  font-size: 15px;
  line-height: 1.85;
  color: var(--foam);
}

.page-about .chapter p {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .chapter p a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 208, 0.4);
  transition: border-color var(--dur) var(--ease);
}

.page-about .chapter p a:hover,
.page-about .chapter p a:focus-visible {
  border-bottom-color: var(--cyan);
}

.page-about .about-note {
  margin-top: 20px !important;
  padding: 14px 16px;
  border: 1px solid var(--line);
  background: rgba(15, 65, 96, 0.35);
}

.page-about .chapter-divider {
  height: 0;
  margin: 30px 0 0;
  border: 0;
  border-top: 1px dashed rgba(185, 214, 228, 0.22);
  transform: skewY(-1.6deg);
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  position: relative;
  margin: 22px 0;
  border: 1px solid var(--line);
  background: var(--trench);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .about-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    96deg,
    rgba(53, 224, 208, 0.07) 0 2px,
    transparent 2px 26px
  );
  opacity: 0.9;
}

.page-about .about-figure figcaption {
  position: relative;
  z-index: 1;
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.02em;
  line-height: 1.6;
  color: var(--mist);
  background: rgba(6, 24, 38, 0.92);
}

/* ---------- 团队筛选与卡片 ---------- */

.page-about .crew-filter {
  margin: 6px 0 18px;
}

.page-about .crew-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .crew-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 16px 18px;
  border: 1px solid var(--line);
  background: linear-gradient(158deg, rgba(15, 65, 96, 0.58), rgba(11, 42, 63, 0.82));
}

.page-about .crew-card h3 {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--foam);
}

.page-about .crew-code {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--coral);
}

.page-about .crew-card p {
  margin: 0;
  max-width: none;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .crew-card--accent {
  border-color: rgba(53, 224, 208, 0.55);
  background: linear-gradient(158deg, rgba(53, 224, 208, 0.1), rgba(11, 42, 63, 0.88) 55%);
}

.page-about .crew-card--accent .crew-code {
  color: var(--cyan);
}

/* ---------- 机制列表 ---------- */

.page-about .mech-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .mech-item {
  padding-top: 14px;
  border-top: 2px solid var(--current);
}

.page-about .mech-item:nth-child(2) {
  border-top-color: var(--cyan);
}

.page-about .mech-item:nth-child(3) {
  border-top-color: var(--coral-soft);
}

.page-about .mech-key {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .mech-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 15.5px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--foam);
}

.page-about .mech-item p {
  margin: 0;
  max-width: none;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 版本时间轴 ---------- */

.page-about .release-track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(196px, 1fr);
  gap: 10px;
  margin: 4px 0 0;
  padding: 4px 0 12px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
}

.page-about .release {
  scroll-snap-align: start;
  border: 1px solid var(--line);
  background: linear-gradient(172deg, rgba(15, 65, 96, 0.52), rgba(6, 24, 38, 0.92));
  transition: border-color var(--dur) var(--ease);
}

.page-about .release summary {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 14px 12px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .release summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .rel-ver {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--foam);
}

.page-about .rel-hint {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .release p {
  margin: 0;
  padding: 0 14px 14px;
  max-width: none;
  font-size: 13px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .release[open] {
  border-color: var(--coral);
}

.page-about .release[open] .rel-ver {
  color: var(--coral);
}

.page-about .release--current .rel-ver {
  color: var(--cyan);
}

.page-about .release--current[open] {
  border-color: var(--cyan);
}

.page-about .release--current[open] .rel-ver {
  color: var(--cyan);
}

/* ---------- 区域协作 ---------- */

.page-about .region-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin: 4px 0 22px;
  padding: 0;
  list-style: none;
}

.page-about .region-grid li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 11px 12px;
  border: 1px solid var(--line);
  background: rgba(11, 42, 63, 0.5);
  font-family: var(--font-display);
  font-size: 13.5px;
  color: var(--foam);
}

.page-about .region-code {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--coral-soft);
}

/* ---------- 收尾 CTA ---------- */

.page-about .about-cta {
  display: grid;
  gap: 16px;
  margin-top: 34px;
  padding: 22px 18px;
  border: 1px solid var(--line-strong);
  background: linear-gradient(118deg, rgba(255, 107, 74, 0.16) 0%, rgba(11, 42, 63, 0.72) 58%, rgba(6, 24, 38, 0.9) 100%);
  clip-path: polygon(18px 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%, 0 18px);
}

.page-about .about-cta h2 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 500;
  line-height: 1.45;
  color: var(--foam);
}

.page-about .about-cta p {
  margin: 0;
  max-width: none;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--text-dim);
}

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

/* ---------- 断点 ---------- */

@media (min-width: 640px) {
  .page-about .masthead-frame {
    padding: 32px 26px 26px;
  }

  .page-about .masthead-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .crew-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .crew-card {
    grid-column: span 2;
  }

  .page-about .crew-card--wide {
    grid-column: span 4;
  }

  .page-about .region-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 24px 22px;
  }
}

@media (min-width: 860px) {
  .page-about .mech-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .chapter p,
  .page-about .chapter-lede {
    font-size: 15.5px;
  }
}

@media (min-width: 900px) {
  .page-about .release-track {
    grid-auto-flow: row;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-figure img {
    aspect-ratio: 16 / 9;
  }
}

@media (min-width: 1080px) {
  .page-about .about-body {
    grid-template-columns: var(--about-toc-w) minmax(0, 1fr);
    gap: 48px;
    padding-bottom: 96px;
  }

  .page-about .about-toc {
    position: sticky;
    top: 32px;
    padding: 52px 0 0;
  }

  .page-about .toc-list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-about .toc-list a {
    padding: 9px 12px;
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
    white-space: normal;
    line-height: 1.5;
    font-size: 13.5px;
  }

  .page-about .toc-list a:hover,
  .page-about .toc-list a:focus-visible {
    border-left-color: var(--coral);
  }

  .page-about .chapter {
    padding-top: 42px;
  }

  .page-about .chapter-head {
    gap: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .toc-list a,
  .page-about .release,
  .page-about .chapter p a {
    transition: none;
  }
}
<<<END>>>