.page-about {
  --about-pad: 20px;
  --about-node: 11px;
  --about-line: var(--c-scale);
  padding-bottom: 40px;
}

.page-about .breadcrumb {
  padding: 14px 0 12px;
}

.page-about .about-hero {
  border: var(--hair);
  border-top: 3px solid var(--c-red);
  background: var(--c-ink);
  padding: var(--about-pad);
  position: relative;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 46px;
  height: 46px;
  border-left: var(--hair);
  border-top: var(--hair);
  background:
    repeating-linear-gradient(90deg, var(--c-scale) 0 1px, transparent 1px 6px),
    transparent;
  opacity: .5;
  pointer-events: none;
}

.page-about .about-hero__kicker {
  margin: 0 0 12px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--c-sand);
}

.page-about .about-hero__kicker .num {
  color: var(--c-gold);
  margin-right: 6px;
}

.page-about .about-hero__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(28px, 6.4vw, 54px);
  line-height: 1.08;
  letter-spacing: -.01em;
  color: var(--c-bone);
  max-width: 22ch;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-bone);
  opacity: .86;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: var(--hair);
}

.page-about .about-hero__stat {
  padding: 14px 12px 14px 0;
  border-bottom: var(--hair);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 6px;
}

.page-about .about-hero__stat:nth-child(odd) {
  border-right: var(--hair);
  padding-right: 14px;
}

.page-about .about-hero__stat:nth-child(even) {
  padding-left: 14px;
}

.page-about .about-hero__statnum {
  font-size: 30px;
  font-weight: 600;
  line-height: 1;
  color: var(--c-red);
}

.page-about .about-hero__stat .unit {
  font-size: 12px;
  color: var(--c-sand);
}

.page-about .about-hero__statlabel {
  flex: 0 0 100%;
  margin-top: 6px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--c-bone);
  opacity: .62;
}

.page-about .about-banner {
  margin: 20px 0 0;
  border: var(--hair);
  background: var(--c-night);
  overflow: hidden;
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  aspect-ratio: 1600 / 560;
  object-fit: cover;
  filter: saturate(.72) contrast(1.06) brightness(.92);
}

.page-about .about-banner .media__caption {
  border-top: var(--hair);
  padding: 10px 12px;
  background: var(--c-ink);
}

.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  margin-top: 26px;
}

.page-about .about-toc {
  order: 1;
  border: var(--hair);
  background: var(--c-ink);
  padding: 14px;
  margin-bottom: 22px;
}

.page-about .about-toc__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--c-gold);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--c-scale);
}

.page-about .about-toc__list > li {
  background: var(--c-ink);
}

.page-about .about-toc__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 8px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--c-bone);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: background var(--t-fast), border-color var(--t-fast), color var(--t-fast);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  background: var(--c-night);
  border-left-color: var(--c-ice);
  color: var(--c-ice);
}

.page-about .about-toc__link[aria-current="true"] {
  border-left-color: var(--c-red);
  background: var(--c-night);
  color: var(--c-bone);
}

.page-about .about-toc__idx {
  font-size: 11px;
  color: var(--c-gold);
  flex: 0 0 auto;
}

.page-about .about-toc__note {
  margin: 12px 0 0;
  font-size: 11px;
  line-height: 1.6;
}

.page-about .about-content {
  order: 2;
  min-width: 0;
}

.page-about .about-section {
  padding: 26px 0 30px;
  border-bottom: var(--hair);
  scroll-margin-top: calc(var(--header-h) + 16px);
}

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

.page-about .section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "idx title"
    "note note";
  align-items: baseline;
  gap: 6px 12px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--c-carbon);
  box-shadow: inset 0 -3px 0 var(--c-scale);
  margin-bottom: 16px;
}

.page-about .section-head__idx {
  grid-area: idx;
  font-size: 13px;
  color: var(--c-red);
  border: 1px solid var(--c-scale);
  padding: 1px 6px;
}

.page-about .section-head__title {
  grid-area: title;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 4vw, 30px);
  line-height: 1.15;
  letter-spacing: -.01em;
  color: var(--c-bone);
}

.page-about .section-head__note {
  grid-area: note;
  margin: 0;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--c-sand);
}

.page-about .about-lede {
  margin: 0 0 20px;
  max-width: 70ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-bone);
  opacity: .88;
}

/* 阶段带 */
.page-about .about-stage {
  list-style: none;
  margin: 0;
  padding: 4px 0 0 24px;
  position: relative;
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 16px;
  bottom: 16px;
  width: 1px;
  background: var(--about-line);
}

.page-about .about-stage__item {
  position: relative;
  padding: 0 0 22px;
}

.page-about .about-stage__item:last-child {
  padding-bottom: 0;
}

.page-about .about-stage__item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 5px;
  width: var(--about-node);
  height: var(--about-node);
  background: var(--c-carbon);
  border: 1px solid var(--c-red);
}

.page-about .about-stage__idx {
  display: inline-block;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--c-gold);
  border-bottom: 1px solid var(--c-scale);
  padding-bottom: 2px;
  margin-bottom: 6px;
}

.page-about .about-stage__title {
  margin: 4px 0 6px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 19px;
  line-height: 1.3;
  color: var(--c-bone);
}

.page-about .about-stage__item p {
  margin: 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-bone);
  opacity: .82;
}

/* 通用双栏 */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

/* 步骤 */
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--hair);
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 14px;
  padding: 16px 0;
  border-bottom: var(--hair);
}

.page-about .about-steps__num {
  grid-row: 1 / span 2;
  font-size: 13px;
  color: var(--c-red);
  border: 1px solid var(--c-scale);
  padding: 2px 6px;
  align-self: start;
}

.page-about .about-steps__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
  line-height: 1.3;
  color: var(--c-bone);
}

.page-about .about-steps__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-bone);
  opacity: .8;
}

.page-about .about-process-figure {
  margin: 0;
  border: var(--hair);
  background: var(--c-ink);
  overflow: hidden;
}

.page-about .about-process-figure img {
  display: block;
  width: 100%;
  aspect-ratio: 12 / 7;
  object-fit: cover;
  filter: saturate(.6) contrast(1.08);
}

.page-about .about-process-figure .media__caption {
  border-top: var(--hair);
  padding: 9px 11px;
}

.page-about .about-deviation {
  margin-top: 22px;
  border-left: 3px solid var(--c-gold);
  background: var(--c-ink);
  padding: 14px 16px;
}

.page-about .about-deviation__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 16px;
  color: var(--c-sand);
}

.page-about .about-deviation p {
  margin: 0;
  max-width: 68ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-bone);
  opacity: .84;
}

/* 字段字典 */
.page-about .about-dict {
  border-top: var(--hair);
}

.page-about .about-dict__item {
  border-bottom: var(--hair);
  background: var(--c-ink);
}

.page-about .about-dict__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 4px 14px;
  padding: 13px 12px;
  cursor: pointer;
  list-style: none;
  transition: background var(--t-fast);
}

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

.page-about .about-dict__summary::after {
  content: "展开 ▾";
  font-family: var(--font-num);
  font-size: 11px;
  color: var(--c-ice);
  letter-spacing: .06em;
}

.page-about .about-dict__item[open] .about-dict__summary {
  background: var(--c-night);
  border-left: 2px solid var(--c-red);
}

.page-about .about-dict__item[open] .about-dict__summary::after {
  content: "收起 ▴";
}

.page-about .about-dict__summary:hover {
  background: var(--c-night);
}

.page-about .about-dict__name {
  font-family: var(--font-num);
  font-size: 15px;
  letter-spacing: .02em;
  color: var(--c-bone);
}

.page-about .about-dict__hint {
  font-size: 11px;
  letter-spacing: .05em;
  color: var(--c-sand);
  opacity: .85;
}

.page-about .about-dict__panel {
  padding: 12px 14px 16px;
  border-top: 1px dotted var(--c-scale);
}

.page-about .about-dict__panel p {
  margin: 0;
  max-width: 70ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--c-bone);
  opacity: .84;
}

.page-about .about-dict__foot {
  margin: 14px 0 0;
  font-size: 12px;
  line-height: 1.7;
}

/* 编审小组 */
.page-about .about-team-figure {
  margin: 0;
  border: var(--hair);
  background: var(--c-night);
  overflow: hidden;
}

.page-about .about-team-figure img {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  filter: saturate(.55) contrast(1.1) brightness(.9);
}

.page-about .about-team-figure .media__caption {
  border-top: var(--hair);
  padding: 9px 11px;
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--hair);
}

.page-about .about-roles__item {
  padding: 14px 0;
  border-bottom: var(--hair);
}

.page-about .about-roles__head {
  margin: 0 0 6px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 6px;
}

.page-about .about-roles__count {
  font-size: 30px;
  font-weight: 600;
  line-height: 1;
  color: var(--c-red);
}

.page-about .about-roles__head .unit {
  font-size: 12px;
  color: var(--c-sand);
}

.page-about .about-roles__name {
  margin-left: 6px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
  color: var(--c-bone);
}

.page-about .about-roles__item > p:last-child {
  margin: 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-bone);
  opacity: .82;
}

.page-about .about-roles__note {
  margin: 16px 0 0;
  font-size: 12px;
  line-height: 1.7;
}

/* 内容边界 */
.page-about .about-limits {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--c-scale);
  border: var(--hair);
}

.page-about .about-limits__item {
  background: var(--c-ink);
  border-left: 3px solid var(--c-red);
  padding: 16px 16px 18px;
}

.page-about .about-limits__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
  line-height: 1.3;
  color: var(--c-bone);
}

.page-about .about-limits__item p {
  margin: 0;
  max-width: 70ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--c-bone);
  opacity: .84;
}

/* 引用与纠错 */
.page-about .about-cite {
  border: var(--hair);
  border-left: 3px solid var(--c-gold);
  background: var(--c-ink);
  padding: 16px;
}

.page-about .about-cite__label {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--c-sand);
}

.page-about .about-cite__sample {
  margin: 0;
  padding: 14px;
  background: var(--c-carbon);
  border: 1px solid var(--c-scale);
  font-family: var(--font-num);
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-bone);
  overflow-x: auto;
  white-space: nowrap;
}

.page-about .about-cite__example {
  margin: 10px 0 14px;
  font-size: 12px;
  line-height: 1.7;
}

.page-about .about-cite__copy {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .06em;
}

.page-about .about-subhead {
  margin: 26px 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
  color: var(--c-bone);
}

.page-about .about-checklist + .about-subhead,
.page-about .about-checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--hair);
}

.page-about .about-checklist__item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 11px 0;
  border-bottom: var(--hair);
}

.page-about .about-checklist__box {
  flex: 0 0 auto;
  width: 15px;
  height: 15px;
  margin: 4px 0 0;
  accent-color: var(--c-red);
  cursor: pointer;
}

.page-about .about-checklist__label {
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-bone);
  opacity: .86;
  cursor: pointer;
}

.page-about .about-checklist__box:checked + .about-checklist__label {
  color: var(--c-gold);
  opacity: 1;
}

.page-about .about-next {
  margin-top: 24px;
  border-top: 2px solid var(--c-carbon);
  padding-top: 16px;
}

.page-about .about-next__text {
  margin: 0 0 12px;
  max-width: 68ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--c-bone);
  opacity: .86;
}

.page-about .about-next__links {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-next__link {
  display: inline-block;
  padding: 7px 12px;
  border: 1px solid var(--c-scale);
  background: var(--c-ink);
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--c-ice);
  text-decoration: none;
  transition: border-color var(--t-fast), background var(--t-fast);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: var(--c-ice);
  background: var(--c-night);
}

.page-about .about-next__link:focus-visible,
.page-about .about-toc__link:focus-visible,
.page-about .about-dict__summary:focus-visible {
  outline: 2px solid var(--c-ice);
  outline-offset: 2px;
}

.page-about .btn:focus-visible {
  outline: 2px solid var(--c-ice);
  outline-offset: 2px;
}

/* 移动端防溢出 */
.page-about .about-cite__sample {
  max-width: 100%;
}

@media (min-width: 640px) {
  .page-about {
    --about-pad: 28px;
  }

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

  .page-about .about-hero__stat {
    padding: 16px 14px 16px 0;
    border-bottom: 0;
  }

  .page-about .about-hero__stat:nth-child(even) {
    padding-left: 14px;
  }

  .page-about .about-hero__stat:nth-child(odd) {
    border-right: var(--hair);
  }

  .page-about .about-hero__stat:not(:last-child) {
    border-left: 0;
  }

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

  .page-about .section-head {
    grid-template-columns: auto minmax(0, 1fr) auto;
    grid-template-areas: "idx title note";
  }

  .page-about .section-head__note {
    text-align: right;
  }

  .page-about .about-split {
    gap: 24px;
  }
}

@media (min-width: 960px) {
  .page-about {
    --about-pad: 34px;
  }

  .page-about .about-body {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: 0;
    margin-top: 34px;
  }

  .page-about .about-toc {
    order: 0;
    position: sticky;
    top: calc(var(--header-h) + 20px);
    align-self: start;
    margin-bottom: 0;
    border: 0;
    border-right: var(--hair);
    border-top: 3px solid var(--c-carbon);
    background: transparent;
    padding: 16px 20px 20px 0;
    max-height: calc(100vh - var(--header-h) - 48px);
    overflow-y: auto;
  }

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

  .page-about .about-toc__link {
    padding: 9px 8px 9px 6px;
  }

  .page-about .about-content {
    padding-left: 34px;
  }

  .page-about .about-section {
    padding: 32px 0 38px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  }

  .page-about .about-team-figure {
    max-width: 380px;
  }

  .page-about .about-lede {
    font-size: 16px;
  }
}

@media (min-width: 1280px) {
  .page-about .about-body {
    grid-template-columns: 220px minmax(0, 1fr);
  }

  .page-about .about-content {
    padding-left: 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    animation: none !important;
  }
}