.page-about {
  --about-gap: 24px;
  --about-soft-line: rgba(43, 59, 78, 0.72);
  --about-mint-glow: rgba(53, 242, 192, 0.14);
  background: var(--ink);
  color: var(--fog);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about .mono {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 88px 0 56px;
  background:
    radial-gradient(120% 90% at 88% 6%, var(--about-mint-glow), transparent 58%),
    linear-gradient(158deg, var(--ink) 0%, var(--ink-deep) 100%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -12%;
  right: -10%;
  width: 62%;
  height: 128%;
  background: linear-gradient(104deg, transparent 42%, rgba(53, 242, 192, 0.09) 50%, transparent 58%);
  transform: skewX(-11deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, var(--mint), var(--orange) 42%, transparent 88%);
  opacity: 0.5;
}

.page-about .about-hero .breadcrumbs {
  position: relative;
  z-index: 1;
  margin-bottom: 32px;
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 32px;
  align-items: center;
}

.page-about .about-hero-copy .eyebrow {
  display: inline-block;
  margin: 0 0 14px;
  padding: 4px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  color: var(--mint);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-about .about-hero-copy h1 {
  margin: 0 0 20px;
  font-size: clamp(34px, 7vw, 56px);
  line-height: 1.06;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--fog);
}

.page-about .about-hero-copy .lede {
  margin: 0 0 28px;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--cool);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.page-about .about-copy-link {
  padding: 10px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--mint-soft);
  font-family: var(--font-body);
  font-size: 14px;
  cursor: pointer;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-copy-link:hover,
.page-about .about-copy-link:focus-visible {
  border-color: var(--mint);
  color: var(--mint);
  background: rgba(53, 242, 192, 0.08);
}

.page-about .about-hero-media {
  position: relative;
  margin: 0;
}

.page-about .about-hero-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  object-fit: cover;
  box-shadow: 0 24px 60px rgba(6, 12, 20, 0.55);
}

.page-about .about-hero-media .media-caption {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  color: var(--cool);
  letter-spacing: 0.12em;
}

.page-about .about-hero-stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 40px 0 0;
  padding: 0;
  list-style: none;
  background: var(--soft-line, var(--line));
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 16px;
  background: var(--graph);
}

.page-about .about-stat-num {
  font-size: 24px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--mint);
}

.page-about .about-stat-label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--cool);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: 36px;
  padding-top: 56px;
  padding-bottom: 88px;
}

.page-about .about-toc {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 14px 0;
}

.page-about .about-toc-label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--orange);
  text-transform: uppercase;
}

.page-about .about-toc-list {
  display: flex;
  gap: 8px;
  margin: 12px 0 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  color: var(--cool);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-toc-idx {
  font-size: 11px;
  color: var(--mint-deep);
}

.page-about .about-toc-link:hover,
.page-about .about-toc-link:focus-visible {
  color: var(--mint);
  border-color: var(--mint);
  transform: translateX(2px);
}

.page-about .about-toc-link:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 3px;
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  margin-bottom: 72px;
  scroll-margin-top: 96px;
}

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

.page-about .about-section-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 14px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--about-soft-line);
}

.page-about .about-section-no {
  font-size: 13px;
  font-weight: 700;
  color: var(--mint);
  letter-spacing: 0.1em;
  flex: none;
}

.page-about .about-section-head h2 {
  margin: 0;
  font-size: clamp(23px, 4.2vw, 34px);
  line-height: 1.22;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--fog);
}

.page-about .about-p {
  margin: 0 0 20px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--cool);
  max-width: 62ch;
}

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

/* 章节 01 三问三答 */
.page-about .about-pairs {
  display: grid;
  gap: 1px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-pair {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 18px;
  background: var(--graph);
  border-left: 3px solid transparent;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-pair:hover {
  border-left-color: var(--mint);
  background: var(--char);
}

.page-about .about-pair-q {
  font-size: 15px;
  font-weight: 700;
  color: var(--fog);
}

.page-about .about-pair-a {
  font-size: 13.5px;
  color: var(--cool);
}

/* 章节 02 原则 */
.page-about .about-rules {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 18px;
}

.page-about .about-rule {
  position: relative;
  padding: 20px 20px 20px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--orange);
  background: var(--graph);
}

.page-about .about-rule:nth-child(2) {
  border-left-color: var(--mint);
}

.page-about .about-rule:nth-child(3) {
  border-left-color: var(--mint-soft);
}

.page-about .about-rule h3 {
  margin: 0 0 10px;
  font-size: 18px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--fog);
}

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

/* 关系图 */
.page-about .about-map-wrap {
  margin-top: 36px;
}

.page-about .about-map-figure {
  margin: 0 0 22px;
}

.page-about .about-map-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  object-fit: cover;
}

.page-about .about-map {
  display: grid;
  gap: 18px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(90% 120% at 50% 0%, rgba(53, 242, 192, 0.07), transparent 62%),
    linear-gradient(150deg, var(--graph), var(--char));
}

.page-about .about-map-sources,
.page-about .about-map-targets {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-map-node {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "idx name"
    "idx note";
  column-gap: 10px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(10, 19, 32, 0.55);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-map-node:hover,
.page-about .about-map-node:focus-visible {
  border-color: var(--mint);
  transform: translateY(-2px);
  outline: none;
}

.page-about .about-map-node:focus-visible {
  box-shadow: 0 0 0 2px var(--ink), 0 0 0 4px var(--mint);
}

.page-about .about-map-idx {
  grid-area: idx;
  align-self: center;
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-sm);
  background: rgba(53, 242, 192, 0.14);
  color: var(--mint);
  font-size: 11px;
  font-weight: 700;
}

.page-about .about-map-name {
  grid-area: name;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--fog);
}

.page-about .about-map-note {
  grid-area: note;
  font-size: 12.5px;
  color: var(--cool);
}

.page-about .about-map-core {
  justify-self: center;
  display: grid;
  place-items: center;
  gap: 2px;
  width: 104px;
  height: 104px;
  border-radius: 50%;
  border: 1px dashed var(--mint);
  background: rgba(53, 242, 192, 0.08);
  text-align: center;
}

.page-about .about-map-core-num {
  font-size: 16px;
  font-weight: 700;
  color: var(--mint);
}

.page-about .about-map-core-text {
  font-size: 12px;
  color: var(--cool);
}

.page-about .about-map-target {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(10, 19, 32, 0.4);
  font-size: 13px;
  color: var(--cool);
}

/* 章节 03 版本面板 */
.page-about .about-version {
  margin: 26px 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(160deg, var(--graph), var(--char));
  overflow: hidden;
}

.page-about .about-version-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  background: rgba(53, 242, 192, 0.06);
}

.page-about .about-version-key {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .about-version-value {
  font-size: 22px;
  font-weight: 700;
  color: var(--mint);
  letter-spacing: -0.01em;
}

.page-about .about-version-rows {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-version-rows li {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--about-soft-line);
  font-size: 13.5px;
  color: var(--cool);
}

.page-about .about-version-rows li:last-child {
  border-bottom: 0;
}

.page-about .about-version-rows .mono {
  color: var(--fog);
  font-weight: 600;
  white-space: nowrap;
}

/* 双周刻度 */
.page-about .about-ruler-wrap {
  margin: 26px 0 30px;
  padding: 16px 18px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--char);
}

.page-about .about-ruler {
  height: 42px;
  background-image:
    repeating-linear-gradient(90deg, var(--mint) 0 2px, transparent 2px 4.1666%),
    linear-gradient(90deg, rgba(53, 242, 192, 0.35), rgba(255, 155, 74, 0.35));
  background-size: 100% 16px, 100% 2px;
  background-position: 0 0, 0 100%;
  background-repeat: repeat-x, no-repeat;
  opacity: 0.85;
}

.page-about .about-ruler-labels {
  display: flex;
  justify-content: space-between;
  gap: 6px;
  margin-top: 10px;
  font-size: 10.5px;
  color: var(--cool);
  letter-spacing: 0.06em;
}

.page-about .about-wide-figure {
  margin: 0;
}

.page-about .about-wide-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  object-fit: cover;
}

.page-about .about-wide-figure .media-caption {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  color: var(--cool);
  letter-spacing: 0.12em;
}

/* 章节 04 团队 */
.page-about .about-team {
  display: grid;
  gap: 14px;
  margin: 24px 0;
}

.page-about .about-team-col {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--graph);
  border-top: 3px solid var(--mint);
}

.page-about .about-team-col:nth-child(2) {
  border-top-color: var(--orange);
}

.page-about .about-team-title {
  margin: 0 0 14px;
  font-size: 17px;
  font-weight: 700;
  color: var(--fog);
}

.page-about .about-team-title .mono {
  margin-right: 6px;
  font-size: 20px;
  color: var(--mint);
}

.page-about .about-team-col:nth-child(2) .about-team-title .mono {
  color: var(--orange);
}

.page-about .about-team-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 9px;
}

.page-about .about-team-list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--cool);
}

.page-about .about-team-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--line);
}

/* 章节 05 访客 */
.page-about .about-audience {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.page-about .about-aud-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--graph);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-aud-card:hover {
  border-color: var(--mint);
  transform: translateY(-2px);
}

.page-about .about-aud-card h3 {
  margin: 0;
  font-size: 17px;
  line-height: 1.42;
  font-weight: 700;
  color: var(--fog);
}

.page-about .about-aud-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--cool);
}

.page-about .about-aud-card .tag {
  align-self: flex-start;
}

.page-about .about-aud-link {
  margin-top: auto;
  padding-top: 6px;
  color: var(--mint);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  align-self: flex-start;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-aud-link:hover,
.page-about .about-aud-link:focus-visible {
  color: var(--mint-soft);
  border-bottom-color: var(--mint-soft);
}

.page-about .about-aud-link:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 3px;
}

/* 章节 06 继续浏览 */
.page-about .about-next-links {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-next-link {
  display: grid;
  gap: 5px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--char);
  text-decoration: none;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-next-link:hover,
.page-about .about-next-link:focus-visible {
  border-left-color: var(--mint);
  background: var(--graph);
  transform: translateX(3px);
}

.page-about .about-next-link:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 3px;
}

.page-about .about-next-idx {
  font-size: 11.5px;
  color: var(--orange);
  letter-spacing: 0.06em;
}

.page-about .about-next-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--fog);
}

.page-about .about-next-desc {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--cool);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 860px) {
  .page-about .about-hero {
    padding: 112px 0 72px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
  }

  .page-about .about-map {
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: center;
    gap: 22px;
    padding: 28px;
  }

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

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

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    gap: 56px;
    align-items: start;
    padding-top: 72px;
  }

  .page-about .about-toc {
    position: sticky;
    top: 96px;
    border-top: 0;
    border-bottom: 0;
    border-left: 1px solid var(--line);
    padding: 0 0 0 20px;
  }

  .page-about .about-toc-list {
    flex-direction: column;
    overflow: visible;
    margin-top: 16px;
    gap: 6px;
  }

  .page-about .about-toc-link {
    border-color: transparent;
    border-radius: var(--radius-sm);
    padding: 8px 12px;
  }

  .page-about .about-toc-link:hover,
  .page-about .about-toc-link:focus-visible {
    border-color: var(--line);
    background: rgba(53, 242, 192, 0.06);
  }

  .page-about .about-section {
    margin-bottom: 96px;
  }

  .page-about .about-p {
    font-size: 16.5px;
  }

  .page-about .about-rule {
    padding: 24px 26px 24px 30px;
  }

  .page-about .about-pairs {
    margin-top: 34px;
  }
}

@media (min-width: 1240px) {
  .page-about .about-hero-copy .lede {
    font-size: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc-link,
  .page-about .about-map-node,
  .page-about .about-aud-card,
  .page-about .about-next-link,
  .page-about .about-copy-link,
  .page-about .about-pair {
    transition: none;
  }

  .page-about .about-toc-link:hover,
  .page-about .about-toc-link:focus-visible,
  .page-about .about-map-node:hover,
  .page-about .about-map-node:focus-visible,
  .page-about .about-aud-card:hover,
  .page-about .about-next-link:hover,
  .page-about .about-next-link:focus-visible {
    transform: none;
  }
}
<<<END>>>

.page-about {
  --soft-line: transparent;
}