.page-about {
  --about-rail: 236px;
  --about-colgap: clamp(24px, 4vw, 56px);
  --about-border: rgba(43, 76, 134, 0.5);
  background: var(--c-night-800);
  color: var(--ink-body);
  padding-bottom: clamp(32px, 5vw, 72px);
}

/* —— 页头 —— */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--c-night-900);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 40%;
  opacity: 0.5;
  filter: saturate(0.85);
}

.page-about .about-hero__veil {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 80% at 15% 0%, rgba(255, 107, 26, 0.16) 0%, rgba(255, 107, 26, 0) 55%),
    linear-gradient(180deg, rgba(7, 15, 34, 0.42) 0%, rgba(7, 15, 34, 0.8) 55%, var(--c-night-800) 100%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
  padding-top: clamp(18px, 3vw, 32px);
  padding-bottom: clamp(30px, 5vw, 64px);
}

.page-about .about-hero__eyebrow {
  margin: clamp(18px, 3vw, 34px) 0 12px;
  color: var(--c-signal);
}

.page-about .about-hero__title {
  font-size: clamp(29px, 5.4vw, 58px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--c-white);
  margin: 0 0 18px;
  max-width: 18em;
}

.page-about .about-hero__lead {
  max-width: 43em;
  color: var(--ink-body);
  font-size: clamp(15px, 1.25vw, 17px);
  line-height: 1.85;
  margin: 0;
}

.page-about .about-hero__blocks {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: clamp(22px, 4vw, 40px);
}

.page-about .about-hero__block {
  border: 1px solid var(--about-border);
  border-radius: var(--radius-s);
  padding: 13px 16px;
  background: rgba(22, 48, 94, 0.42);
  box-shadow: var(--shadow-card);
}

.page-about .about-hero__block b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(21px, 2.8vw, 29px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-white);
}

.page-about .about-hero__block--signal b {
  color: var(--c-signal);
}

.page-about .about-hero__block span {
  display: block;
  margin-top: 6px;
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--ink-muted);
}

/* —— 双栏骨架 —— */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-rail {
  padding-top: clamp(20px, 4vw, 36px);
}

.page-about .about-rail__details {
  border: 1px solid var(--about-border);
  border-radius: var(--radius-s);
  background: rgba(7, 15, 34, 0.5);
  padding: 12px 14px;
}

.page-about .about-rail__summary {
  cursor: pointer;
  list-style: none;
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--ink-muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.page-about .about-rail__summary::after {
  content: "＋";
  font-family: var(--font-mono);
  color: var(--c-signal);
}

.page-about .about-rail__details[open] .about-rail__summary::after {
  content: "－";
}

.page-about .about-rail__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 0;
  font-size: var(--fs-15);
  line-height: 1.5;
  color: var(--ink-muted);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 76, 134, 0.28);
  transition: color 0.18s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--c-white);
}

.page-about .about-rail__num {
  color: var(--c-signal);
  font-size: var(--fs-12);
  flex: none;
}

.page-about .about-rail__meta {
  margin: 18px 0 0;
  font-size: var(--fs-12);
  line-height: 1.9;
  color: var(--ink-muted);
}

.page-about .about-rail__meta .hth-mono {
  color: var(--c-white);
}

/* —— 章节 —— */
.page-about .about-section {
  padding-block: clamp(28px, 4.5vw, 52px);
  border-top: 1px solid var(--about-border);
  min-width: 0;
}

.page-about section.about-section:first-of-type {
  border-top: 0;
  padding-top: clamp(24px, 4vw, 48px);
}

.page-about .about-section__head {
  display: grid;
  gap: 8px;
  margin-bottom: clamp(16px, 2.5vw, 26px);
}

.page-about .about-section__num {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  color: var(--ink-muted);
}

.page-about .about-section__title {
  margin: 0;
  font-size: clamp(22px, 2.7vw, 32px);
  line-height: 1.26;
  font-weight: 800;
  letter-spacing: -0.015em;
  color: var(--c-white);
}

.page-about .about-prose p {
  margin: 0 0 1em;
  max-width: 40em;
  font-size: clamp(15px, 1.1vw, 17px);
  line-height: 1.85;
}

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

.page-about .about-prose a,
.page-about .about-rule a {
  color: var(--c-signal);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 107, 26, 0.45);
}

.page-about .about-prose a:hover,
.page-about .about-rule a:hover {
  border-bottom-color: var(--c-signal);
}

/* —— 折叠 —— */
.page-about .about-fold {
  margin-top: 20px;
  border: 1px solid var(--about-border);
  border-radius: var(--radius-s);
  background: rgba(7, 15, 34, 0.48);
}

.page-about .about-fold > summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 16px;
  color: var(--c-white);
  font-weight: 600;
  font-size: var(--fs-15);
}

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

.page-about .about-fold > summary::after {
  content: "＋";
  font-family: var(--font-mono);
  font-size: var(--fs-19);
  color: var(--c-signal);
}

.page-about .about-fold[open] > summary::after {
  content: "－";
}

.page-about .about-fold__body {
  padding: 0 16px 16px;
}

.page-about .about-fold__body ul {
  margin: 0;
  padding-left: 1.1em;
}

.page-about .about-fold__body li {
  margin-bottom: 0.65em;
  font-size: var(--fs-15);
  line-height: 1.8;
}

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

.page-about .about-fold__body strong {
  color: var(--c-white);
}

/* —— 团队 —— */
.page-about .about-team {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-line {
  border-left: 2px solid var(--c-line);
  padding: 2px 0 2px 14px;
  margin-bottom: 18px;
}

.page-about .about-line h3 {
  margin: 0 0 6px;
  font-size: var(--fs-19);
  color: var(--c-white);
  font-weight: 700;
}

.page-about .about-line p {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.8;
}

.page-about .about-line--data {
  border-left-color: var(--c-blue);
}

.page-about .about-line--team {
  border-left-color: var(--c-green);
}

.page-about .about-line--service {
  border-left-color: var(--c-signal);
}

.page-about .about-team__note {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.8;
  color: var(--ink-muted);
}

.page-about .about-team__media {
  border-radius: var(--radius-s);
  overflow: hidden;
  border: 1px solid var(--about-border);
  margin: 0;
}

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

.page-about .about-team__media .hth-media__caption {
  padding: 10px 12px;
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--ink-muted);
  background: rgba(7, 15, 34, 0.6);
}

/* —— 阶段演进 —— */
.page-about .about-evo {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--about-border);
  border-radius: var(--radius-s);
  background: var(--c-night-900);
  padding: clamp(14px, 2.6vw, 26px);
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .about-evo__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.14;
  pointer-events: none;
}

.page-about .about-evo__scroll {
  position: relative;
  z-index: 1;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-evo__svg {
  display: block;
  width: 100%;
  min-width: 620px;
  height: auto;
}

.page-about .about-evo__label {
  fill: var(--c-mist);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
}

.page-about .about-evo__name {
  fill: var(--c-white);
  font-family: var(--font-sans);
  font-size: 21px;
  font-weight: 800;
}

.page-about .about-evo__desc {
  fill: var(--ink-muted);
  font-family: var(--font-sans);
  font-size: 13px;
}

.page-about .about-evo__dot {
  transition: r 0.18s var(--ease);
}

.page-about .about-evo__node:hover .about-evo__dot {
  r: 13;
}

.page-about .about-stages {
  display: grid;
  gap: 12px;
}

.page-about .about-stage {
  border: 1px solid var(--about-border);
  border-radius: var(--radius-s);
  padding: 16px;
  background: rgba(22, 48, 94, 0.32);
}

.page-about .about-stage h3 {
  margin: 0 0 8px;
  font-size: var(--fs-19);
  line-height: 1.4;
  color: var(--c-white);
  font-weight: 700;
}

.page-about .about-stage p {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.8;
}

.page-about .about-stage__tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 2px 9px;
  border-radius: var(--radius-pill);
  border: 1px solid currentColor;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
}

.page-about .about-stage__tag--a {
  color: var(--c-blue);
}

.page-about .about-stage__tag--b {
  color: var(--c-green);
}

.page-about .about-stage__tag--c {
  color: var(--c-signal);
}

/* —— 对照表 —— */
.page-about .about-crosswalk {
  background: var(--c-night-900);
  border-top: 1px solid var(--about-border);
  border-bottom: 1px solid var(--about-border);
  padding-inline: clamp(14px, 2.4vw, 30px);
}

.page-about .about-crosswalk__lead {
  margin: 0 0 clamp(16px, 2.5vw, 24px);
  max-width: 42em;
  font-size: clamp(15px, 1.1vw, 17px);
  line-height: 1.85;
}

.page-about .about-filterbar {
  margin-bottom: 16px;
}

.page-about .about-tablewrap {
  overflow-x: auto;
  border: 1px solid var(--about-border);
  border-radius: var(--radius-s);
  background: rgba(11, 27, 58, 0.7);
}

.page-about .about-table {
  width: 100%;
  min-width: 660px;
  border-collapse: collapse;
  font-size: var(--fs-15);
}

.page-about .about-table__caption {
  text-align: left;
  padding: 12px 14px;
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--ink-muted);
  border-bottom: 1px solid var(--about-border);
}

.page-about .about-table th {
  text-align: left;
  padding: 12px 14px;
  font-size: var(--fs-12);
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--ink-muted);
  border-bottom: 1px solid var(--c-line);
  white-space: nowrap;
}

.page-about .about-table td {
  padding: 13px 14px;
  line-height: 1.7;
  vertical-align: top;
  border-bottom: 1px solid rgba(43, 76, 134, 0.35);
  color: var(--ink-body);
}

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

.page-about .about-table tbody tr:hover td {
  background: rgba(22, 48, 94, 0.5);
}

.page-about .about-table tbody tr[data-filter-hidden]:not([data-filter-hidden="false"]),
.page-about .about-table tbody tr[hidden] {
  display: none;
}

.page-about .about-table__old {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--c-white);
  font-weight: 600;
}

.page-about .about-table__old::before {
  content: "";
  width: 6px;
  height: 6px;
  flex: none;
  border-radius: 50%;
  background: var(--c-red);
}

.page-about .about-table__new {
  color: var(--c-signal);
  font-weight: 600;
  text-decoration: none;
}

.page-about a.about-table__new:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-table__new--plain {
  color: var(--c-white);
}

/* —— 规模 —— */
.page-about .about-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-stat {
  border: 1px solid var(--about-border);
  border-radius: var(--radius-s);
  padding: 16px 18px;
  background: linear-gradient(160deg, rgba(22, 48, 94, 0.56), rgba(7, 15, 34, 0.5));
  box-shadow: var(--shadow-card);
  min-width: 0;
}

.page-about .about-stat--full {
  grid-column: 1 / -1;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--c-white);
}

.page-about .about-stat__num em {
  font-style: normal;
  font-size: 0.48em;
  font-weight: 600;
  color: var(--ink-muted);
  margin-left: 3px;
}

.page-about .about-stat--lead .about-stat__num {
  color: var(--c-signal);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: var(--fs-12);
  line-height: 1.6;
  letter-spacing: 0.05em;
  color: var(--ink-muted);
}

.page-about .about-stat__cats {
  margin: 10px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.page-about .about-scale__note {
  margin-top: clamp(18px, 3vw, 26px);
}

/* —— 准则 —— */
.page-about .about-rules {
  display: grid;
  gap: 12px;
}

.page-about .about-rule {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 12px;
  border: 1px solid var(--about-border);
  border-radius: var(--radius-s);
  padding: 16px;
  background: rgba(22, 48, 94, 0.26);
}

.page-about .about-rule__idx {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--c-signal);
  padding-top: 4px;
}

.page-about .about-rule__title {
  margin: 0 0 6px;
  font-size: var(--fs-19);
  line-height: 1.4;
  color: var(--c-white);
  font-weight: 700;
}

.page-about .about-rule p {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.8;
}

/* —— 去向 —— */
.page-about .about-next {
  border-top: 1px solid var(--about-border);
  padding-block: clamp(28px, 4.5vw, 52px) clamp(8px, 2vw, 20px);
}

.page-about .about-next__title {
  margin: 0 0 clamp(14px, 2.5vw, 22px);
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 800;
  color: var(--c-white);
}

.page-about .about-next__grid {
  display: grid;
  gap: 12px;
}

.page-about .about-next__card {
  display: grid;
  gap: 6px;
  padding: 18px;
  border: 1px solid var(--about-border);
  border-radius: var(--radius-s);
  background: rgba(7, 15, 34, 0.42);
  text-decoration: none;
  color: var(--ink-muted);
  transition: border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  border-color: var(--c-signal);
  transform: translateY(-2px);
}

.page-about .about-next__kicker {
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--c-signal);
}

.page-about .about-next__card strong {
  font-size: var(--fs-19);
  color: var(--c-white);
}

.page-about .about-next__card span:last-child {
  font-size: var(--fs-15);
  line-height: 1.7;
}

/* —— 响应式 —— */
@media (min-width: 640px) {
  .page-about .about-hero__blocks {
    grid-template-columns: 1.5fr 1fr 1fr;
  }

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

@media (min-width: 760px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

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

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

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

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

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: var(--about-colgap);
    align-items: start;
  }

  .page-about .about-rail {
    grid-column: 1;
    padding-top: clamp(24px, 4vw, 48px);
  }

  .page-about .about-rail__details {
    border: 0;
    background: none;
    padding: 0;
  }

  .page-about .about-rail__summary {
    display: none;
  }

  .page-about .about-rail__inner,
  .page-about .about-rail__body {
    position: sticky;
    top: 24px;
  }

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

  .page-about .about-wide {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1200px) {
  .page-about .about-crosswalk {
    padding-inline: clamp(20px, 2.4vw, 34px);
  }
}
<<<PAGE_CSS_END>>>
</main>