.page-about {
  --about-line: rgba(108, 138, 128, 0.28);
  --about-step: 24px;
  background: var(--night-green);
  color: var(--score-white);
  overflow-x: clip;
}

.page-about .about-h2 {
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.12;
  font-size: clamp(1.6rem, 5.4vw, 2.6rem);
  margin: 10px 0 16px;
  max-width: 26ch;
}

.page-about .about-note {
  font-size: 0.95rem;
  color: var(--graphite);
  border-left: 3px solid var(--stoppage-orange);
  padding-left: 14px;
  margin-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 40px 0 56px;
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -10% -20% 0 -20%;
  background: linear-gradient(150deg, var(--deep-green) 0%, rgba(11, 42, 33, 0) 68%);
  clip-path: polygon(64% 0, 100% 0, 100% 100%, 38% 100%);
  z-index: -1;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--data-blue), rgba(45, 156, 255, 0) 62%);
  z-index: -1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-hero .display {
  font-size: clamp(2rem, 7.2vw, 3.6rem);
  line-height: 1.06;
  margin: 10px 0 18px;
  max-width: 20ch;
}

.page-about .about-hero .lede {
  max-width: 56ch;
  color: rgba(242, 246, 244, 0.82);
  font-size: 1.02rem;
}

.page-about .about-board {
  background: var(--ink);
  border-left: 4px solid var(--data-blue);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
  padding: 18px 20px 22px;
}

.page-about .about-board__title {
  font-family: var(--font-heading);
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--graphite);
  margin-bottom: 14px;
}

.page-about .about-board__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 14px;
}

.page-about .about-board .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-top: 1px solid var(--about-line);
  padding-top: 10px;
}

.page-about .about-board .stat__value {
  font-size: clamp(1.7rem, 7vw, 2.3rem);
  line-height: 1;
  color: var(--score-white);
}

.page-about .about-board .stat__label {
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--graphite);
}

/* ---------- 索引 ---------- */
.page-about .about-map {
  padding: 8px 0 36px;
}

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

.page-about .about-map__link {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 12px 10px;
  text-decoration: none;
  color: var(--score-white);
  border-bottom: 1px solid var(--about-line);
  transition: background-color 0.18s var(--ease), padding-left 0.18s var(--ease);
}

.page-about .about-map__link:hover,
.page-about .about-map__link:focus-visible {
  background: rgba(45, 156, 255, 0.1);
  padding-left: 16px;
}

.page-about .about-map__num {
  color: var(--data-blue);
  font-size: 0.82rem;
}

.page-about .about-map__text {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  letter-spacing: 0.01em;
}

.page-about .about-map__meta {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--graphite);
}

/* ---------- 通用分段 ---------- */
.page-about .about-section {
  position: relative;
  padding: 52px 0;
}

.page-about .about-section--night {
  background: var(--night-green);
}

.page-about .about-section--deep {
  background: var(--deep-green);
}

.page-about .about-section--paper {
  background: var(--archive-cream);
  color: var(--ink);
}

.page-about .about-section--paper .about-h2 {
  color: var(--ink);
}

.page-about .about-section--ink {
  background: var(--ink);
}

.page-about .about-section--ink .about-h2 {
  color: var(--score-white);
}

.page-about .about-head__intro {
  max-width: 60ch;
  color: rgba(242, 246, 244, 0.78);
}

.page-about .about-section--paper .about-head__intro,
.page-about .about-section--paper .about-note {
  color: #3d4f48;
}

/* ---------- 起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-origin__text p {
  max-width: 62ch;
  margin-bottom: 14px;
  line-height: 1.78;
}

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

.page-about .media-frame {
  background: var(--deep-green);
  overflow: hidden;
}

.page-about .about-section--paper .media-frame {
  background: rgba(6, 18, 14, 0.08);
}

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

.page-about .media-frame--wide img {
  aspect-ratio: 14 / 9;
}

.page-about .media-frame__caption {
  display: block;
  padding: 10px 12px 12px;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--graphite);
  border-top: 1px solid var(--about-line);
}

.page-about .about-section--paper .media-frame__caption {
  color: #46564f;
  border-top-color: rgba(6, 18, 14, 0.14);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 30px;
  position: relative;
  display: grid;
  gap: 30px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--graphite) 0%, var(--data-blue) 42%, var(--replay-purple) 70%, var(--stoppage-orange) 100%);
}

.page-about .about-stage {
  position: relative;
  background: var(--deep-green);
  padding: 20px 20px 18px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  border-top: 2px solid var(--stage-accent, var(--data-blue));
}

.page-about .about-stage:nth-child(1) { --stage-accent: var(--graphite); }
.page-about .about-stage:nth-child(2) { --stage-accent: var(--data-blue); }
.page-about .about-stage:nth-child(3) { --stage-accent: var(--replay-purple); }
.page-about .about-stage:nth-child(4) { --stage-accent: var(--stoppage-orange); }

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 24px;
  width: 12px;
  height: 12px;
  background: var(--stage-accent, var(--data-blue));
  transform: rotate(45deg);
}

.page-about .about-stage__seal {
  display: inline-block;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--stage-accent, var(--data-blue));
  border: 1px solid currentColor;
  border-radius: 999px;
  padding: 2px 10px;
}

.page-about .about-stage__era {
  margin: 12px 0 4px;
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--graphite);
}

.page-about .about-stage__title {
  font-family: var(--font-heading);
  font-size: 1.32rem;
  font-weight: 700;
  line-height: 1.24;
  margin-bottom: 10px;
  color: var(--score-white);
}

.page-about .about-stage__text {
  font-size: 0.96rem;
  line-height: 1.76;
  color: rgba(242, 246, 244, 0.8);
  max-width: 58ch;
}

.page-about .about-stage__more {
  margin-top: 14px;
  border-top: 1px solid var(--about-line);
  padding-top: 12px;
}

.page-about .about-stage__more summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--stage-accent, var(--data-blue));
}

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

.page-about .about-stage__more summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1rem;
  margin-left: auto;
}

.page-about .about-stage__more[open] summary::after {
  content: "–";
}

.page-about .about-stage__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-stage__list li {
  position: relative;
  padding-left: 18px;
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(242, 246, 244, 0.84);
}

.page-about .about-stage__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 7px;
  height: 7px;
  background: var(--stage-accent, var(--data-blue));
}

/* ---------- 团队 ---------- */
.page-about .about-head--split {
  display: grid;
  gap: 12px;
}

.page-about .about-roles {
  margin-top: 26px;
  display: grid;
  gap: 18px;
}

.page-about .about-role {
  background: rgba(6, 18, 14, 0.42);
  border-left: 3px solid var(--data-blue);
  padding: 18px 18px 16px;
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-role:nth-child(2) { border-left-color: var(--replay-purple); }
.page-about .about-role:nth-child(3) { border-left-color: var(--stoppage-orange); }

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  background: rgba(6, 18, 14, 0.66);
}

.page-about .about-role__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-role__num {
  font-size: 1.4rem;
  color: var(--data-blue);
  line-height: 1;
}

.page-about .about-role:nth-child(2) .about-role__num { color: var(--replay-purple); }
.page-about .about-role:nth-child(3) .about-role__num { color: var(--stoppage-orange); }

.page-about .about-role__name {
  font-family: var(--font-heading);
  font-size: 1.18rem;
  font-weight: 600;
  color: var(--score-white);
}

.page-about .about-role__share {
  font-size: 0.85rem;
  color: var(--graphite);
}

.page-about .about-role__track {
  margin: 14px 0 12px;
  height: 8px;
  background: rgba(108, 138, 128, 0.24);
  overflow: hidden;
}

.page-about .about-role__fill {
  display: block;
  height: 100%;
  background: var(--data-blue);
  transition: width 0.18s var(--ease);
}

.page-about .about-role__fill--collect { width: 42%; }
.page-about .about-role__fill--verify { width: 31%; background: var(--replay-purple); }
.page-about .about-role__fill--archive { width: 27%; background: var(--stoppage-orange); }

.page-about .about-role__desc {
  font-size: 0.94rem;
  line-height: 1.72;
  color: rgba(242, 246, 244, 0.82);
  max-width: 60ch;
}

.page-about .about-role__detail {
  margin-top: 10px;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--data-blue);
  opacity: 0.42;
  transition: opacity 0.2s var(--ease);
}

.page-about .about-role:hover .about-role__detail,
.page-about .about-role:focus-within .about-role__detail {
  opacity: 1;
}

/* ---------- 校验 ---------- */
.page-about .about-verify__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-verify__text > p {
  max-width: 60ch;
  line-height: 1.78;
}

.page-about .about-steps {
  margin-top: 20px;
  display: grid;
  gap: 14px;
}

.page-about .about-step {
  position: relative;
  padding: 16px 16px 14px 52px;
  background: rgba(6, 18, 14, 0.06);
}

.page-about .about-step__num {
  position: absolute;
  left: 16px;
  top: 18px;
  font-size: 0.9rem;
  color: var(--data-blue-deep);
  font-weight: 700;
}

.page-about .about-step__title {
  font-family: var(--font-heading);
  font-size: 1.08rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--ink);
}

.page-about .about-step p {
  font-size: 0.92rem;
  line-height: 1.7;
  color: #33443d;
}

.page-about .about-verify__callout {
  margin-top: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--ink);
  color: var(--score-white);
  padding: 16px 18px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .about-verify__figure {
  font-size: 2.1rem;
  line-height: 1;
  color: var(--stoppage-orange);
}

.page-about .about-verify__callout p {
  font-size: 0.88rem;
  line-height: 1.62;
  color: rgba(242, 246, 244, 0.84);
}

.page-about .about-verify__figure.media-frame {
  margin: 0;
}

/* ---------- 协作 ---------- */
.page-about .about-network__grid {
  display: grid;
  gap: 30px;
}

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

.page-about .about-network__text p {
  max-width: 58ch;
  line-height: 1.78;
  color: rgba(242, 246, 244, 0.82);
}

.page-about .about-network__stats {
  margin: 22px 0 6px;
  display: grid;
  gap: 14px;
}

.page-about .about-network__stat {
  display: flex;
  align-items: baseline;
  gap: 14px;
  border-bottom: 1px solid var(--about-line);
  padding-bottom: 12px;
}

.page-about .about-network__num {
  font-size: 2.1rem;
  line-height: 1;
}

.page-about .about-network__label {
  font-size: 0.88rem;
  line-height: 1.6;
  color: rgba(242, 246, 244, 0.78);
}

/* ---------- 区域 ---------- */
.page-about .about-region__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-region__text p {
  max-width: 58ch;
  line-height: 1.78;
  color: rgba(242, 246, 244, 0.82);
}

.page-about .about-region__facts {
  margin: 22px 0 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-region__fact {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-region__fact dt {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--graphite);
}

.page-about .about-region__fact dd {
  margin: 0;
  font-size: 0.96rem;
  color: var(--score-white);
  word-break: break-word;
}

.page-about .about-region__aside {
  position: relative;
  padding: 20px 18px 22px;
  border: 1px solid var(--about-line);
  overflow: hidden;
}

.page-about .about-region__shape {
  position: absolute;
  right: -18px;
  top: -12px;
  width: 190px;
  height: auto;
  opacity: 0.32;
  pointer-events: none;
}

.page-about .about-region__shape path {
  fill: none;
  stroke: var(--data-blue);
  stroke-width: 2;
}

.page-about .about-coverage__title {
  font-family: var(--font-heading);
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--graphite);
  margin-bottom: 12px;
}

.page-about .about-coverage__bar {
  height: 14px;
  background-image: repeating-linear-gradient(90deg, rgba(45, 156, 255, 0.9) 0 6px, rgba(45, 156, 255, 0) 6px 13px);
  border-bottom: 2px solid var(--stoppage-orange);
}

.page-about .about-coverage__caption {
  margin-top: 14px;
  font-size: 0.88rem;
  line-height: 1.7;
  color: rgba(242, 246, 244, 0.8);
}

.page-about .about-coverage__caption .mono {
  color: var(--stoppage-orange);
  font-size: 1.05rem;
}

.page-about .about-region__aside .btn {
  margin-top: 18px;
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  margin-top: 24px;
  display: grid;
  gap: 14px;
}

.page-about .about-next__item {
  display: block;
  padding: 20px 20px 18px;
  background: var(--deep-green);
  border-left: 3px solid var(--data-blue);
  text-decoration: none;
  color: var(--score-white);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: transform 0.24s var(--ease), background-color 0.24s var(--ease);
}

.page-about .about-next__item:nth-child(2) { border-left-color: var(--replay-purple); }
.page-about .about-next__item:nth-child(3) { border-left-color: var(--stoppage-orange); }

.page-about .about-next__item:hover,
.page-about .about-next__item:focus-visible {
  transform: translate(-4px, -4px);
  background: rgba(18, 58, 46, 0.6);
}

.page-about .about-next__num {
  font-size: 0.8rem;
  color: var(--data-blue);
}

.page-about .about-next__title {
  font-family: var(--font-heading);
  font-size: 1.22rem;
  font-weight: 700;
  margin: 8px 0 8px;
}

.page-about .about-next__item p {
  font-size: 0.92rem;
  line-height: 1.7;
  color: rgba(242, 246, 244, 0.8);
  max-width: 56ch;
}

.page-about .about-next__go {
  display: inline-block;
  margin-top: 12px;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--stoppage-orange);
}

.page-about .about-next__foot {
  margin-top: 20px;
  font-size: 0.9rem;
  color: var(--graphite);
}

.page-about .about-next__foot a {
  color: var(--data-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 桌面 ---------- */
@media (min-width: 860px) {
  .page-about .about-hero {
    padding: 60px 0 72px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.62fr) minmax(0, 1fr);
    align-items: end;
    gap: 48px;
  }

  .page-about .about-map__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
  }

  .page-about .about-section {
    padding: 84px 0;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: start;
    gap: 48px;
  }

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

  .page-about .about-head--split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: end;
    gap: 40px;
  }

  .page-about .about-timeline {
    padding-left: 46px;
    gap: 38px;
  }

  .page-about .about-stage {
    padding: 26px 28px 24px;
    max-width: 72%;
  }

  .page-about .about-stage:nth-child(even) {
    margin-left: auto;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-verify__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-network__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: 48px;
    align-items: center;
  }

  .page-about .about-region__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-region__fact {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }

  .page-about .about-next {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-timeline {
    padding-left: 60px;
  }

  .page-about .about-stage {
    max-width: 66%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-map__link,
  .page-about .about-role,
  .page-about .about-role__detail,
  .page-about .about-next__item {
    transition: none;
  }

  .page-about .about-next__item:hover,
  .page-about .about-next__item:focus-visible {
    transform: none;
  }
}
</main>

.page-about {
  --about-line: rgba(108, 138, 128, 0.28);
  background: var(--night-green);
  color: var(--score-white);
  overflow-x: clip;
}

.page-about .about-h2 {
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.12;
  font-size: clamp(1.6rem, 5.4vw, 2.6rem);
  margin: 10px 0 16px;
  max-width: 26ch;
}

.page-about .about-note {
  font-size: 0.95rem;
  color: var(--graphite);
  border-left: 3px solid var(--stoppage-orange);
  padding-left: 14px;
  margin-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 40px 0 56px;
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -10% -20% 0 -20%;
  background: linear-gradient(150deg, var(--deep-green) 0%, rgba(11, 42, 33, 0) 68%);
  clip-path: polygon(64% 0, 100% 0, 100% 100%, 38% 100%);
  z-index: -1;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--data-blue), rgba(45, 156, 255, 0) 62%);
  z-index: -1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-hero .display {
  font-size: clamp(2rem, 7.2vw, 3.6rem);
  line-height: 1.06;
  margin: 10px 0 18px;
  max-width: 20ch;
}

.page-about .about-hero .lede {
  max-width: 56ch;
  color: rgba(242, 246, 244, 0.82);
  font-size: 1.02rem;
}

.page-about .about-board {
  background: var(--ink);
  border-left: 4px solid var(--data-blue);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
  padding: 18px 20px 22px;
}

.page-about .about-board__title {
  font-family: var(--font-heading);
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--graphite);
  margin-bottom: 14px;
}

.page-about .about-board__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 14px;
}

.page-about .about-board .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-top: 1px solid var(--about-line);
  padding-top: 10px;
}

.page-about .about-board .stat__value {
  font-size: clamp(1.7rem, 7vw, 2.3rem);
  line-height: 1;
  color: var(--score-white);
}

.page-about .about-board .stat__label {
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--graphite);
}

/* ---------- 主题索引 ---------- */
.page-about .about-map {
  padding: 8px 0 36px;
}

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

.page-about .about-map__link {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 12px 10px;
  text-decoration: none;
  color: var(--score-white);
  border-bottom: 1px solid var(--about-line);
  transition: background-color 0.18s var(--ease), padding-left 0.18s var(--ease);
}

.page-about .about-map__link:hover,
.page-about .about-map__link:focus-visible {
  background: rgba(45, 156, 255, 0.1);
  padding-left: 16px;
}

.page-about .about-map__num {
  color: var(--data-blue);
  font-size: 0.82rem;
}

.page-about .about-map__text {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  letter-spacing: 0.01em;
}

.page-about .about-map__meta {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--graphite);
}

/* ---------- 分段 ---------- */
.page-about .about-section {
  position: relative;
  padding: 52px 0;
}

.page-about .about-section--night { background: var(--night-green); }
.page-about .about-section--deep { background: var(--deep-green); }
.page-about .about-section--ink { background: var(--ink); }

.page-about .about-section--paper {
  background: var(--archive-cream);
  color: var(--ink);
}

.page-about .about-section--paper .about-h2,
.page-about .about-section--ink .about-h2 {
  color: inherit;
}

.page-about .about-head__intro {
  max-width: 60ch;
  color: rgba(242, 246, 244, 0.78);
}

/* ---------- 起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-origin__text p {
  max-width: 62ch;
  margin-bottom: 14px;
  line-height: 1.78;
}

.page-about .about-section--paper .about-note,
.page-about .about-section--paper .about-head__intro {
  color: #3d4f48;
}

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

.page-about .media-frame {
  background: var(--deep-green);
  overflow: hidden;
}

.page-about .about-section--paper .media-frame {
  background: rgba(6, 18, 14, 0.08);
}

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

.page-about .media-frame--wide img {
  aspect-ratio: 14 / 9;
}

.page-about .media-frame__caption {
  display: block;
  padding: 10px 12px 12px;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--graphite);
  border-top: 1px solid var(--about-line);
}

.page-about .about-section--paper .media-frame__caption {
  color: #46564f;
  border-top-color: rgba(6, 18, 14, 0.14);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 30px;
  position: relative;
  display: grid;
  gap: 30px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--graphite) 0%, var(--data-blue) 42%, var(--replay-purple) 70%, var(--stoppage-orange) 100%);
}

.page-about .about-stage {
  position: relative;
  background: var(--deep-green);
  padding: 20px 20px 18px;
  border-top: 2px solid var(--stage-accent, var(--data-blue));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .about-stage:nth-child(1) { --stage-accent: var(--graphite); }
.page-about .about-stage:nth-child(2) { --stage-accent: var(--data-blue); }
.page-about .about-stage:nth-child(3) { --stage-accent: var(--replay-purple); }
.page-about .about-stage:nth-child(4) { --stage-accent: var(--stoppage-orange); }

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 24px;
  width: 12px;
  height: 12px;
  background: var(--stage-accent, var(--data-blue));
  transform: rotate(45deg);
}

.page-about .about-stage__seal {
  display: inline-block;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--stage-accent, var(--data-blue));
  border: 1px solid currentColor;
  border-radius: 999px;
  padding: 2px 10px;
}

.page-about .about-stage__era {
  margin: 12px 0 4px;
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--graphite);
}

.page-about .about-stage__title {
  font-family: var(--font-heading);
  font-size: 1.32rem;
  font-weight: 700;
  line-height: 1.24;
  margin-bottom: 10px;
  color: var(--score-white);
}

.page-about .about-stage__text {
  font-size: 0.96rem;
  line-height: 1.76;
  color: rgba(242, 246, 244, 0.8);
  max-width: 58ch;
}

.page-about .about-stage__more {
  margin-top: 14px;
  border-top: 1px solid var(--about-line);
  padding-top: 12px;
}

.page-about .about-stage__more summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--stage-accent, var(--data-blue));
}

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

.page-about .about-stage__more summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1rem;
  margin-left: auto;
}

.page-about .about-stage__more[open] summary::after {
  content: "–";
}

.page-about .about-stage__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-stage__list li {
  position: relative;
  padding-left: 18px;
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(242, 246, 244, 0.84);
}

.page-about .about-stage__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 7px;
  height: 7px;
  background: var(--stage-accent, var(--data-blue));
}

/* ---------- 团队 ---------- */
.page-about .about-head--split {
  display: grid;
  gap: 12px;
}

.page-about .about-roles {
  margin-top: 26px;
  display: grid;
  gap: 18px;
}

.page-about .about-role {
  background: rgba(6, 18, 14, 0.42);
  border-left: 3px solid var(--data-blue);
  padding: 18px 18px 16px;
  transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-role:nth-child(2) { border-left-color: var(--replay-purple); }
.page-about .about-role:nth-child(3) { border-left-color: var(--stoppage-orange); }

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  background: rgba(6, 18, 14, 0.68);
}

.page-about .about-role__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-role__num {
  font-size: 1.4rem;
  line-height: 1;
  color: var(--data-blue);
}

.page-about .about-role:nth-child(2) .about-role__num { color: var(--replay-purple); }
.page-about .about-role:nth-child(3) .about-role__num { color: var(--stoppage-orange); }

.page-about .about-role__name {
  font-family: var(--font-heading);
  font-size: 1.18rem;
  font-weight: 600;
}

.page-about .about-role__share {
  font-size: 0.85rem;
  color: var(--graphite);
}

.page-about .about-role__track {
  margin: 14px 0 12px;
  height: 8px;
  background: rgba(108, 138, 128, 0.24);
  overflow: hidden;
}

.page-about .about-role__fill {
  display: block;
  height: 100%;
  background: var(--data-blue);
  transition: width 0.18s var(--ease);
}

.page-about .about-role__fill--collect { width: 42%; }
.page-about .about-role__fill--verify { width: 31%; background: var(--replay-purple); }
.page-about .about-role__fill--archive { width: 27%; background: var(--stoppage-orange); }

.page-about .about-role__desc {
  font-size: 0.94rem;
  line-height: 1.72;
  color: rgba(242, 246, 244, 0.82);
  max-width: 60ch;
}

.page-about .about-role__detail {
  margin-top: 10px;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--data-blue);
  opacity: 0.42;
  transition: opacity 0.2s var(--ease);
}

.page-about .about-role:hover .about-role__detail,
.page-about .about-role:focus-within .about-role__detail {
  opacity: 1;
}

/* ---------- 校验 ---------- */
.page-about .about-verify__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-verify__text > p {
  max-width: 60ch;
  line-height: 1.78;
}

.page-about .about-steps {
  margin-top: 20px;
  display: grid;
  gap: 14px;
}

.page-about .about-step {
  position: relative;
  padding: 16px 16px 14px 52px;
  background: rgba(6, 18, 14, 0.06);
}

.page-about .about-step__num {
  position: absolute;
  left: 16px;
  top: 18px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--data-blue-deep);
}

.page-about .about-step__title {
  font-family: var(--font-heading);
  font-size: 1.08rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.page-about .about-step p {
  font-size: 0.92rem;
  line-height: 1.7;
  color: #33443d;
}

.page-about .about-verify__callout {
  margin-top: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--ink);
  color: var(--score-white);
  padding: 16px 18px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .about-verify__figure {
  font-size: 2.1rem;
  line-height: 1;
  color: var(--stoppage-orange);
}

.page-about .about-verify__callout p {
  font-size: 0.88rem;
  line-height: 1.62;
  color: rgba(242, 246, 244, 0.84);
}

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

/* ---------- 协作 ---------- */
.page-about .about-network__grid {
  display: grid;
  gap: 30px;
}

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

.page-about .about-network__text p {
  max-width: 58ch;
  line-height: 1.78;
  color: rgba(242, 246, 244, 0.82);
}

.page-about .about-network__stats {
  margin: 22px 0 6px;
  display: grid;
  gap: 14px;
}

.page-about .about-network__stat {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-network__num {
  font-size: 2.1rem;
  line-height: 1;
}

.page-about .about-network__label {
  font-size: 0.88rem;
  line-height: 1.6;
  color: rgba(242, 246, 244, 0.78);
}

/* ---------- 区域 ---------- */
.page-about .about-region__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-region__text p {
  max-width: 58ch;
  line-height: 1.78;
  color: rgba(242, 246, 244, 0.82);
}

.page-about .about-region__facts {
  margin: 22px 0 0;
  display: grid;
  border-top: 1px solid var(--about-line);
}

.page-about .about-region__fact {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-region__fact dt {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--graphite);
}

.page-about .about-region__fact dd {
  margin: 0;
  font-size: 0.96rem;
  color: var(--score-white);
  word-break: break-word;
}

.page-about .about-region__aside {
  position: relative;
  padding: 20px 18px 22px;
  border: 1px solid var(--about-line);
  overflow: hidden;
}

.page-about .about-region__shape {
  position: absolute;
  right: -18px;
  top: -12px;
  width: 190px;
  height: auto;
  opacity: 0.32;
  pointer-events: none;
}

.page-about .about-region__shape path {
  fill: none;
  stroke: var(--data-blue);
  stroke-width: 2;
}

.page-about .about-coverage__title {
  font-family: var(--font-heading);
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--graphite);
  margin-bottom: 12px;
}

.page-about .about-coverage__bar {
  height: 14px;
  border-bottom: 2px solid var(--stoppage-orange);
  background-image: repeating-linear-gradient(90deg, rgba(45, 156, 255, 0.9) 0 6px, rgba(45, 156, 255, 0) 6px 13px);
}

.page-about .about-coverage__caption {
  margin-top: 14px;
  font-size: 0.88rem;
  line-height: 1.7;
  color: rgba(242, 246, 244, 0.8);
}

.page-about .about-coverage__caption .mono {
  font-size: 1.05rem;
  color: var(--stoppage-orange);
}

.page-about .about-region__aside .btn {
  margin-top: 18px;
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  margin-top: 24px;
  display: grid;
  gap: 14px;
}

.page-about .about-next__item {
  display: block;
  padding: 20px 20px 18px;
  background: var(--deep-green);
  border-left: 3px solid var(--data-blue);
  text-decoration: none;
  color: var(--score-white);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: transform 0.24s var(--ease), background-color 0.24s var(--ease);
}

.page-about .about-next__item:nth-child(2) { border-left-color: var(--replay-purple); }
.page-about .about-next__item:nth-child(3) { border-left-color: var(--stoppage-orange); }

.page-about .about-next__item:hover,
.page-about .about-next__item:focus-visible {
  transform: translate(-4px, -4px);
  background: rgba(18, 58, 46, 0.62);
}

.page-about .about-next__num {
  font-size: 0.8rem;
  color: var(--data-blue);
}

.page-about .about-next__title {
  font-family: var(--font-heading);
  font-size: 1.22rem;
  font-weight: 700;
  margin: 8px 0;
}

.page-about .about-next__item p {
  font-size: 0.92rem;
  line-height: 1.7;
  color: rgba(242, 246, 244, 0.8);
  max-width: 56ch;
}

.page-about .about-next__go {
  display: inline-block;
  margin-top: 12px;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--stoppage-orange);
}

.page-about .about-next__foot {
  margin-top: 20px;
  font-size: 0.9rem;
  color: var(--graphite);
}

.page-about .about-next__foot a {
  color: var(--data-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 桌面 ---------- */
@media (min-width: 860px) {
  .page-about .about-hero {
    padding: 60px 0 72px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.62fr) minmax(0, 1fr);
    align-items: end;
    gap: 48px;
  }

  .page-about .about-map__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
  }

  .page-about .about-section {
    padding: 84px 0;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: start;
    gap: 48px;
  }

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

  .page-about .about-head--split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: end;
    gap: 40px;
  }

  .page-about .about-timeline {
    padding-left: 46px;
    gap: 38px;
  }

  .page-about .about-stage {
    max-width: 72%;
    padding: 26px 28px 24px;
  }

  .page-about .about-stage:nth-child(even) {
    margin-left: auto;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-verify__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    align-items: start;
    gap: 52px;
  }

  .page-about .about-network__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    align-items: center;
    gap: 48px;
  }

  .page-about .about-region__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: start;
    gap: 48px;
  }

  .page-about .about-region__fact {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }

  .page-about .about-next {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-timeline {
    padding-left: 60px;
  }

  .page-about .about-stage {
    max-width: 66%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-map__link,
  .page-about .about-role,
  .page-about .about-role__detail,
  .page-about .about-next__item {
    transition: none;
  }

  .page-about .about-next__item:hover,
  .page-about .about-next__item:focus-visible {
    transform: none;
  }
}

.page-about {
  --about-line: rgba(108, 138, 128, 0.28);
  background: var(--night-green);
  color: var(--score-white);
  overflow-x: clip;
}

.page-about .about-h2 {
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.12;
  font-size: clamp(1.6rem, 5.4vw, 2.6rem);
  margin: 10px 0 16px;
  max-width: 26ch;
}

.page-about .about-note {
  font-size: 0.95rem;
  color: var(--graphite);
  border-left: 3px solid var(--stoppage-orange);
  padding-left: 14px;
  margin-top: 18px;
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding: 40px 0 56px;
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -10% -20% 0 -20%;
  background: linear-gradient(150deg, var(--deep-green) 0%, rgba(11, 42, 33, 0) 68%);
  clip-path: polygon(64% 0, 100% 0, 100% 100%, 38% 100%);
  z-index: -1;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--data-blue), rgba(45, 156, 255, 0) 62%);
  z-index: -1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-hero .display {
  font-size: clamp(2rem, 7.2vw, 3.6rem);
  line-height: 1.06;
  margin: 10px 0 18px;
  max-width: 20ch;
}

.page-about .about-hero .lede {
  max-width: 56ch;
  font-size: 1.02rem;
  color: rgba(242, 246, 244, 0.82);
}

.page-about .about-board {
  background: var(--ink);
  border-left: 4px solid var(--data-blue);
  padding: 18px 20px 22px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .about-board__title {
  font-family: var(--font-heading);
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--graphite);
  margin-bottom: 14px;
}

.page-about .about-board__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 14px;
}

.page-about .about-board .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 10px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-board .stat__value {
  font-size: clamp(1.7rem, 7vw, 2.3rem);
  line-height: 1;
  color: var(--score-white);
}

.page-about .about-board .stat__label {
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--graphite);
}

/* 主题索引 */
.page-about .about-map {
  padding: 8px 0 36px;
}

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

.page-about .about-map__link {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 12px 10px;
  color: var(--score-white);
  text-decoration: none;
  border-bottom: 1px solid var(--about-line);
  transition: background-color 0.18s var(--ease), padding-left 0.18s var(--ease);
}

.page-about .about-map__link:hover,
.page-about .about-map__link:focus-visible {
  padding-left: 16px;
  background: rgba(45, 156, 255, 0.1);
}

.page-about .about-map__num {
  font-size: 0.82rem;
  color: var(--data-blue);
}

.page-about .about-map__text {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  letter-spacing: 0.01em;
}

.page-about .about-map__meta {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--graphite);
}

/* 分段底色 */
.page-about .about-section {
  position: relative;
  padding: 52px 0;
}

.page-about .about-section--night { background: var(--night-green); }
.page-about .about-section--deep { background: var(--deep-green); }
.page-about .about-section--ink { background: var(--ink); }

.page-about .about-section--paper {
  background: var(--archive-cream);
  color: var(--ink);
}

.page-about .about-head__intro {
  max-width: 60ch;
  color: rgba(242, 246, 244, 0.78);
}

.page-about .about-section--paper .about-head__intro,
.page-about .about-section--paper .about-note {
  color: #3d4f48;
}

/* 起点 */
.page-about .about-origin__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-origin__text p {
  max-width: 62ch;
  margin-bottom: 14px;
  line-height: 1.78;
}

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

.page-about .media-frame {
  overflow: hidden;
  background: var(--deep-green);
}

.page-about .about-section--paper .media-frame {
  background: rgba(6, 18, 14, 0.08);
}

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

.page-about .media-frame--wide img {
  aspect-ratio: 14 / 9;
}

.page-about .media-frame__caption {
  display: block;
  padding: 10px 12px 12px;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--graphite);
  border-top: 1px solid var(--about-line);
}

.page-about .about-section--paper .media-frame__caption {
  color: #46564f;
  border-top-color: rgba(6, 18, 14, 0.14);
}

/* 时间轴 */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 30px;
  display: grid;
  gap: 30px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--graphite) 0%, var(--data-blue) 42%, var(--replay-purple) 70%, var(--stoppage-orange) 100%);
}

.page-about .about-stage {
  position: relative;
  padding: 20px 20px 18px;
  background: var(--deep-green);
  border-top: 2px solid var(--stage-accent, var(--data-blue));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .about-stage:nth-child(1) { --stage-accent: var(--graphite); }
.page-about .about-stage:nth-child(2) { --stage-accent: var(--data-blue); }
.page-about .about-stage:nth-child(3) { --stage-accent: var(--replay-purple); }
.page-about .about-stage:nth-child(4) { --stage-accent: var(--stoppage-orange); }

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 24px;
  width: 12px;
  height: 12px;
  background: var(--stage-accent, var(--data-blue));
  transform: rotate(45deg);
}

.page-about .about-stage__seal {
  display: inline-block;
  padding: 2px 10px;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--stage-accent, var(--data-blue));
  border: 1px solid currentColor;
  border-radius: 999px;
}

.page-about .about-stage__era {
  margin: 12px 0 4px;
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--graphite);
}

.page-about .about-stage__title {
  font-family: var(--font-heading);
  font-size: 1.32rem;
  font-weight: 700;
  line-height: 1.24;
  margin-bottom: 10px;
  color: var(--score-white);
}

.page-about .about-stage__text {
  max-width: 58ch;
  font-size: 0.96rem;
  line-height: 1.76;
  color: rgba(242, 246, 244, 0.8);
}

.page-about .about-stage__more {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-stage__more summary {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  cursor: pointer;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--stage-accent, var(--data-blue));
}

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

.page-about .about-stage__more summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1rem;
}

.page-about .about-stage__more[open] summary::after {
  content: "–";
}

.page-about .about-stage__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-stage__list li {
  position: relative;
  padding-left: 18px;
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(242, 246, 244, 0.84);
}

.page-about .about-stage__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 7px;
  height: 7px;
  background: var(--stage-accent, var(--data-blue));
}

/* 团队 */
.page-about .about-head--split {
  display: grid;
  gap: 12px;
}

.page-about .about-roles {
  margin-top: 26px;
  display: grid;
  gap: 18px;
}

.page-about .about-role {
  padding: 18px 18px 16px;
  background: rgba(6, 18, 14, 0.42);
  border-left: 3px solid var(--data-blue);
  transition: background-color 0.2s var(--ease);
}

.page-about .about-role:nth-child(2) { border-left-color: var(--replay-purple); }
.page-about .about-role:nth-child(3) { border-left-color: var(--stoppage-orange); }

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  background: rgba(6, 18, 14, 0.68);
}

.page-about .about-role__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-role__num {
  font-size: 1.4rem;
  line-height: 1;
  color: var(--data-blue);
}

.page-about .about-role:nth-child(2) .about-role__num { color: var(--replay-purple); }
.page-about .about-role:nth-child(3) .about-role__num { color: var(--stoppage-orange); }

.page-about .about-role__name {
  font-family: var(--font-heading);
  font-size: 1.18rem;
  font-weight: 600;
}

.page-about .about-role__share {
  font-size: 0.85rem;
  color: var(--graphite);
}

.page-about .about-role__track {
  margin: 14px 0 12px;
  height: 8px;
  overflow: hidden;
  background: rgba(108, 138, 128, 0.24);
}

.page-about .about-role__fill {
  display: block;
  height: 100%;
  background: var(--data-blue);
}

.page-about .about-role__fill--collect { width: 42%; }
.page-about .about-role__fill--verify { width: 31%; background: var(--replay-purple); }
.page-about .about-role__fill--archive { width: 27%; background: var(--stoppage-orange); }

.page-about .about-role__desc {
  max-width: 60ch;
  font-size: 0.94rem;
  line-height: 1.72;
  color: rgba(242, 246, 244, 0.82);
}

.page-about .about-role__detail {
  margin-top: 10px;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--data-blue);
  opacity: 0.42;
  transition: opacity 0.2s var(--ease);
}

.page-about .about-role:hover .about-role__detail,
.page-about .about-role:focus-within .about-role__detail {
  opacity: 1;
}

/* 三层流程 */
.page-about .about-verify__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-verify__text > p {
  max-width: 60ch;
  line-height: 1.78;
}

.page-about .about-steps {
  margin-top: 20px;
  display: grid;
  gap: 14px;
}

.page-about .about-step {
  position: relative;
  padding: 16px 16px 14px 52px;
  background: rgba(6, 18, 14, 0.06);
}

.page-about .about-step__num {
  position: absolute;
  left: 16px;
  top: 18px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--data-blue-deep);
}

.page-about .about-step__title {
  font-family: var(--font-heading);
  font-size: 1.08rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.page-about .about-step p {
  font-size: 0.92rem;
  line-height: 1.7;
  color: #33443d;
}

.page-about .about-verify__callout {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 20px;
  padding: 16px 18px;
  background: var(--ink);
  color: var(--score-white);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .about-verify__callout .about-verify__figure {
  flex: none;
  font-size: 2.1rem;
  line-height: 1;
  color: var(--stoppage-orange);
}

.page-about .about-verify__callout p {
  font-size: 0.88rem;
  line-height: 1.62;
  color: rgba(242, 246, 244, 0.84);
}

.page-about figure.about-verify__figure {
  margin: 0;
  font-size: 1rem;
  color: inherit;
}

/* 协作 */
.page-about .about-network__grid {
  display: grid;
  gap: 30px;
}

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

.page-about .about-network__text p {
  max-width: 58ch;
  line-height: 1.78;
  color: rgba(242, 246, 244, 0.82);
}

.page-about .about-network__stats {
  margin: 22px 0 6px;
  display: grid;
  gap: 14px;
}

.page-about .about-network__stat {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-network__num {
  font-size: 2.1rem;
  line-height: 1;
}

.page-about .about-network__label {
  font-size: 0.88rem;
  line-height: 1.6;
  color: rgba(242, 246, 244, 0.78);
}

/* 区域 */
.page-about .about-region__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-region__text p {
  max-width: 58ch;
  line-height: 1.78;
  color: rgba(242, 246, 244, 0.82);
}

.page-about .about-region__facts {
  margin: 22px 0 0;
  display: grid;
  border-top: 1px solid var(--about-line);
}

.page-about .about-region__fact {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-region__fact dt {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--graphite);
}

.page-about .about-region__fact dd {
  margin: 0;
  font-size: 0.96rem;
  color: var(--score-white);
  word-break: break-word;
}

.page-about .about-region__aside {
  position: relative;
  padding: 20px 18px 22px;
  overflow: hidden;
  border: 1px solid var(--about-line);
}

.page-about .about-region__shape {
  position: absolute;
  right: -18px;
  top: -12px;
  width: 190px;
  height: auto;
  opacity: 0.32;
  pointer-events: none;
}

.page-about .about-region__shape path {
  fill: none;
  stroke: var(--data-blue);
  stroke-width: 2;
}

.page-about .about-coverage__title {
  font-family: var(--font-heading);
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--graphite);
  margin-bottom: 12px;
}

.page-about .about-coverage__bar {
  height: 14px;
  border-bottom: 2px solid var(--stoppage-orange);
  background-image: repeating-linear-gradient(90deg, rgba(45, 156, 255, 0.9) 0 6px, rgba(45, 156, 255, 0) 6px 13px);
}

.page-about .about-coverage__caption {
  margin-top: 14px;
  font-size: 0.88rem;
  line-height: 1.7;
  color: rgba(242, 246, 244, 0.8);
}

.page-about .about-coverage__caption .mono {
  font-size: 1.05rem;
  color: var(--stoppage-orange);
}

.page-about .about-region__aside .btn {
  margin-top: 18px;
}

/* 下一步 */
.page-about .about-next {
  margin-top: 24px;
  display: grid;
  gap: 14px;
}

.page-about .about-next__item {
  display: block;
  padding: 20px 20px 18px;
  background: var(--deep-green);
  border-left: 3px solid var(--data-blue);
  color: var(--score-white);
  text-decoration: none;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: transform 0.24s var(--ease), background-color 0.24s var(--ease);
}

.page-about .about-next__item:nth-child(2) { border-left-color: var(--replay-purple); }
.page-about .about-next__item:nth-child(3) { border-left-color: var(--stoppage-orange); }

.page-about .about-next__item:hover,
.page-about .about-next__item:focus-visible {
  transform: translate(-4px, -4px);
  background: rgba(18, 58, 46, 0.62);
}

.page-about .about-next__num {
  font-size: 0.8rem;
  color: var(--data-blue);
}

.page-about .about-next__title {
  font-family: var(--font-heading);
  font-size: 1.22rem;
  font-weight: 700;
  margin: 8px 0;
}

.page-about .about-next__item p {
  max-width: 56ch;
  font-size: 0.92rem;
  line-height: 1.7;
  color: rgba(242, 246, 244, 0.8);
}

.page-about .about-next__go {
  display: inline-block;
  margin-top: 12px;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--stoppage-orange);
}

.page-about .about-next__foot {
  margin-top: 20px;
  font-size: 0.9rem;
  color: var(--graphite);
}

.page-about .about-next__foot a {
  color: var(--data-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 桌面 */
@media (min-width: 860px) {
  .page-about .about-hero {
    padding: 60px 0 72px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.62fr) minmax(0, 1fr);
    align-items: end;
    gap: 48px;
  }

  .page-about .about-map__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
  }

  .page-about .about-section {
    padding: 84px 0;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: start;
    gap: 48px;
  }

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

  .page-about .about-head--split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: end;
    gap: 40px;
  }

  .page-about .about-timeline {
    padding-left: 46px;
    gap: 38px;
  }

  .page-about .about-stage {
    max-width: 72%;
    padding: 26px 28px 24px;
  }

  .page-about .about-stage:nth-child(even) {
    margin-left: auto;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-verify__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    align-items: start;
    gap: 52px;
  }

  .page-about .about-network__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    align-items: center;
    gap: 48px;
  }

  .page-about .about-region__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: start;
    gap: 48px;
  }

  .page-about .about-region__fact {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }

  .page-about .about-next {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-timeline {
    padding-left: 60px;
  }

  .page-about .about-stage {
    max-width: 66%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-map__link,
  .page-about .about-role,
  .page-about .about-role__detail,
  .page-about .about-next__item {
    transition: none;
  }

  .page-about .about-next__item:hover,
  .page-about .about-next__item:focus-visible {
    transform: none;
  }
}