.page-about {
  --about-sec-gap: clamp(2.4rem, 5vw, 3.8rem);
  --about-hair: rgba(51, 65, 85, 0.62);
  background: var(--ink-900);
  color: var(--text);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(2rem, 5vw, 3.6rem) clamp(2.2rem, 5vw, 3.4rem);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 12% 0%, rgba(53, 224, 208, 0.1), transparent 58%),
    radial-gradient(90% 80% at 92% 8%, rgba(167, 139, 250, 0.13), transparent 62%),
    linear-gradient(165deg, var(--ink-950) 0%, var(--ink-900) 46%, var(--violet-900) 100%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.6rem, 3vw, 2.4rem);
  margin-top: 1.5rem;
}

.page-about .about-hero__lead .kicker {
  margin: 0 0 0.4rem;
}

.page-about .page-title {
  margin: 0 0 1rem;
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.18;
  color: var(--text);
}

.page-about .lede {
  max-width: 60ch;
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.page-about .about-hero__meta {
  display: grid;
  gap: 0.9rem;
  margin: 0;
  padding-left: 1.1rem;
  border-left: 1px solid var(--line);
}

.page-about .about-hero__metaitem dt {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--muted-dim);
}

.page-about .about-hero__metaitem dd {
  margin: 0.2rem 0 0;
  font-family: var(--mono);
  font-size: 0.95rem;
  color: var(--gold);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(1.8rem, 4vw, 2.6rem);
  padding-block: clamp(2rem, 5vw, 3.6rem);
}

/* ---------- 章节轨道 ---------- */
.page-about .about-toc__label {
  margin: 0 0 0.7rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--muted-dim);
}

.page-about .about-toc__list {
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0 0 0.4rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.45rem 0.65rem;
  border: 1px solid var(--line-soft);
  color: var(--muted);
  font-size: 0.82rem;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-toc__num {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--cyan);
}

.page-about .about-toc__link:hover {
  color: var(--text);
  border-color: var(--cyan);
}

.page-about .about-toc__link[aria-current="true"] {
  color: var(--text);
  border-color: var(--cyan);
  background: rgba(53, 224, 208, 0.1);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding-block: var(--about-sec-gap);
  border-top: 1px solid var(--about-hair);
}

.page-about .about-flow > .about-sec:first-child {
  border-top: 0;
  padding-top: clamp(0.8rem, 2vw, 1.4rem);
}

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  margin-bottom: 1.3rem;
}

.page-about .about-sec__num {
  flex: none;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-sec h2 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.3rem, 2.5vw, 1.85rem);
  line-height: 1.36;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-sec h3 {
  margin: 0 0 0.25rem;
  font-family: var(--sans);
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text);
}

.page-about .about-sec p {
  line-height: 1.8;
}

.page-about .prose p {
  margin: 0 0 1rem;
  max-width: 66ch;
  color: var(--muted);
  font-size: 0.96rem;
}

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

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

/* ---------- 图片 ---------- */
.page-about .media__frame {
  border: 1px solid var(--line);
  overflow: hidden;
  background: var(--ink-950);
}

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

.page-about .media__cap {
  margin-top: 0.55rem;
  font-size: 0.74rem;
  color: var(--muted-dim);
  line-height: 1.6;
}

.page-about .media__cap .mono {
  color: var(--muted);
}

/* ---------- 01 起源 ---------- */
.page-about .about-origin {
  display: grid;
  gap: 1.6rem;
}

.page-about .about-origin__fig {
  margin: 0;
}

.page-about .about-tl {
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
  position: relative;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 0.5rem;
  bottom: 0.6rem;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(232, 184, 106, 0.5) 70%, transparent);
}

.page-about .about-tl__item {
  position: relative;
  padding-left: 1.9rem;
  margin-bottom: 1.35rem;
}

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

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 0.35rem;
  width: 11px;
  height: 11px;
  background: var(--ink-900);
  border: 1px solid var(--cyan);
}

.page-about .about-tl__item--now::before {
  background: var(--gold);
  border-color: var(--gold);
}

.page-about .about-tl__date {
  margin: 0 0 0.1rem;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .about-tl__text {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

/* ---------- 02 内容体系 ---------- */
.page-about .about-stats {
  display: grid;
  gap: 0.9rem;
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stat {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.75rem;
  padding-top: 0.55rem;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-stat__k {
  font-size: 0.82rem;
  color: var(--muted);
  white-space: nowrap;
}

.page-about .about-stat__bar {
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), rgba(53, 224, 208, 0.08));
}

.page-about .about-stat__v {
  font-size: 0.9rem;
  color: var(--gold);
  white-space: nowrap;
}

.page-about .about-index {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(84px, 1fr));
  gap: 1px;
  margin: 1.4rem 0 0;
  padding: 1px;
  list-style: none;
  border: 1px solid var(--line-soft);
  background: var(--line-soft);
}

.page-about .about-index li {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.7rem 0.6rem;
  background: var(--ink-950);
}

.page-about .about-index__num {
  font-size: 0.74rem;
  color: var(--cyan);
}

.page-about .about-index__lab {
  font-size: 0.7rem;
  color: var(--muted-dim);
  letter-spacing: 0.06em;
}

.page-about .about-index__item--last {
  background: linear-gradient(160deg, rgba(232, 184, 106, 0.16), var(--ink-950)) !important;
}

.page-about .about-index__item--last .about-index__num {
  color: var(--gold);
}

.page-about .about-system__fig {
  margin: 1.8rem 0 0;
}

/* ---------- 03 版本 ---------- */
.page-about .about-versions {
  display: grid;
  gap: 1.8rem;
}

.page-about .about-versions__lede {
  margin: 0 0 1.3rem;
  max-width: 62ch;
  font-size: 0.96rem;
  color: var(--muted);
}

.page-about .about-lines {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1rem;
}

.page-about .about-lines li {
  display: grid;
  grid-template-columns: 2.1rem 1fr;
  gap: 0.15rem 0.9rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-lines__num {
  grid-row: 1;
  font-size: 0.76rem;
  color: var(--gold);
}

.page-about .about-lines__title {
  grid-column: 2;
}

.page-about .about-lines__text {
  grid-column: 2;
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.page-about .about-versions__fig {
  margin: 0;
  align-self: start;
}

/* ---------- 04 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 1.2rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__group {
  padding-top: 0.8rem;
  border-top: 2px solid var(--line);
}

.page-about .about-team__group:nth-child(1) {
  border-top-color: var(--cyan);
}

.page-about .about-team__group:nth-child(2) {
  border-top-color: var(--gold);
}

.page-about .about-team__group:nth-child(3) {
  border-top-color: var(--focus);
}

.page-about .about-team__idx {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.72rem;
  color: var(--muted-dim);
  letter-spacing: 0.1em;
}

.page-about .about-team__group p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.page-about .about-team__facts {
  margin-top: 1.6rem;
  padding-left: 1rem;
  border-left: 2px solid var(--gold);
}

.page-about .about-team__facts p {
  margin: 0 0 0.8rem;
  max-width: 66ch;
  font-size: 0.94rem;
  color: var(--muted);
}

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

/* ---------- 05 原则 ---------- */
.page-about .about-principles__lede {
  margin: 0 0 1.3rem;
  max-width: 62ch;
  font-size: 0.96rem;
  color: var(--muted);
}

.page-about .about-rules {
  display: grid;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rules li {
  padding: 1rem 1.1rem 1.05rem;
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--cyan);
  background: linear-gradient(160deg, rgba(30, 42, 58, 0.55), rgba(7, 12, 22, 0.4));
}

.page-about .about-rules__num {
  display: block;
  margin-bottom: 0.3rem;
  font-size: 0.72rem;
  color: var(--cyan);
  letter-spacing: 0.1em;
}

.page-about .about-rules li p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.page-about .about-principles__more {
  margin: 1.3rem 0 0;
  font-size: 0.9rem;
  color: var(--muted-dim);
}

.page-about .about-principles__more a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 208, 0.35);
}

/* ---------- 06 对照 ---------- */
.page-about .about-choose__lede {
  margin: 0 0 1.2rem;
  max-width: 64ch;
  font-size: 0.96rem;
  color: var(--muted);
}

.page-about .about-compare-wrap {
  overflow-x: auto;
  border: 1px solid var(--line-soft);
  background: var(--ink-950);
}

.page-about .about-compare {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: 0.86rem;
}

.page-about .about-compare caption {
  caption-side: top;
  padding: 0.7rem 0.9rem;
  border-bottom: 1px solid var(--line-soft);
  text-align: left;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--muted-dim);
}

.page-about .about-compare th,
.page-about .about-compare td {
  padding: 0.75rem 0.9rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line-soft);
  line-height: 1.65;
}

.page-about .about-compare thead th {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--muted-dim);
  background: var(--violet-900);
}

.page-about .about-compare tbody th {
  width: 21%;
  font-weight: 600;
  color: var(--text);
}

.page-about .about-compare tbody td {
  color: var(--muted);
}

.page-about .about-compare tbody td:nth-of-type(1) {
  color: var(--text);
}

.page-about .about-compare tbody tr:last-child th,
.page-about .about-compare tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .about-choose__more {
  margin: 1.2rem 0 0;
  max-width: 66ch;
  font-size: 0.9rem;
  color: var(--muted);
}

.page-about .about-choose__more a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 208, 0.35);
}

/* ---------- 去向 ---------- */
.page-about .about-next {
  margin-top: clamp(1.6rem, 4vw, 2.8rem);
  padding-top: clamp(1.6rem, 4vw, 2.4rem);
  border-top: 1px solid var(--line);
}

.page-about .about-next__title {
  margin: 0 0 1rem;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  color: var(--text);
}

.page-about .about-next__grid {
  display: grid;
  gap: 1px;
  border: 1px solid var(--line-soft);
  background: var(--line-soft);
}

.page-about .about-next__item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.05rem 1.15rem;
  background: var(--ink-950);
  color: var(--muted);
  font-size: 0.86rem;
  text-decoration: none;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-next__item .mono {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--cyan);
  letter-spacing: 0.1em;
}

.page-about .about-next__item strong {
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
}

.page-about .about-next__item:hover,
.page-about .about-next__item:focus-visible {
  background: var(--surface);
  color: var(--text);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: 1fr 1fr;
    gap: 0.9rem 1.8rem;
  }

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

  .page-about .about-rules {
    grid-template-columns: 1fr 1fr;
  }

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

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) 208px;
    align-items: end;
  }

  .page-about .about-origin {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
    gap: 2rem;
  }

  .page-about .about-versions {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 2.2rem;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 172px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.2rem);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 5.5rem;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 0.1rem;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-toc__link {
    padding: 0.5rem 0.8rem;
    border: 0;
    border-left: 1px solid var(--line-soft);
    white-space: normal;
    font-size: 0.82rem;
    line-height: 1.5;
  }

  .page-about .about-toc__link[aria-current="true"] {
    border-left-color: var(--cyan);
    background: linear-gradient(90deg, rgba(53, 224, 208, 0.14), transparent 85%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__link,
  .page-about .about-next__item {
    transition: none;
  }
}
<<<PAGE_CSS_END>>>