.page-about {
  --about-rail: 216px;
  --about-gap: clamp(32px, 4.5vw, 76px);
  --about-measure: 38em;
  background: var(--sand);
  color: var(--ink);
  padding-bottom: clamp(56px, 8vw, 120px);
  overflow-x: clip;
}

.page-about .about-wrap {
  width: 100%;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding-inline: var(--gutter);
}

/* 面包屑 */
.page-about .about-crumbs {
  padding-top: clamp(24px, 4vw, 44px);
  font-size: 14px;
}
.page-about .about-crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--slate);
}
.page-about .about-crumbs__list li + li::before {
  content: "/";
  margin-right: 10px;
  color: var(--rule);
}
.page-about .about-crumbs__list a {
  color: var(--green-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-fast) var(--ease);
}
.page-about .about-crumbs__list a:hover {
  border-bottom-color: var(--green-2);
}

/* 首屏 */
.page-about .about-lead {
  padding-top: clamp(26px, 4vw, 52px);
  padding-bottom: clamp(30px, 5vw, 64px);
}
.page-about .about-ticks {
  height: 10px;
  margin-bottom: clamp(26px, 4vw, 46px);
  background-image: repeating-linear-gradient(to right, var(--rule) 0 1px, transparent 1px 14px);
}
.page-about .about-lead .eyebrow {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--slate);
  margin: 0 0 18px;
}
.page-about .about-h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(42px, 9vw, 104px);
  line-height: 0.96;
  letter-spacing: -0.04em;
  margin: 0 0 24px;
  max-width: 14ch;
}
.page-about .about-h1 em {
  font-style: normal;
  color: var(--rust);
}
.page-about .about-lede {
  font-size: clamp(17px, 1.9vw, 20px);
  line-height: 1.85;
  max-width: 46ch;
  margin: 0 0 22px;
  color: var(--ink);
}
.page-about .about-meta {
  font-family: var(--font-data);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--slate);
  margin: 0;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
  max-width: 46ch;
}

/* 首屏图 */
.page-about .about-herofig {
  margin: 0 0 clamp(44px, 6vw, 88px);
  padding-inline: var(--gutter);
}
.page-about .about-herofig__frame {
  position: relative;
  max-width: var(--shell-max);
  margin: 0 auto;
  border: 1px solid var(--rule);
  background: var(--sand-2);
  overflow: hidden;
}
.page-about .about-herofig__frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}
.page-about .about-herofig__label {
  position: absolute;
  left: 0;
  bottom: 0;
  background: var(--green);
  color: var(--cyan);
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 8px 14px;
}
.page-about .about-herofig__cap {
  max-width: var(--shell-max);
  margin: 12px auto 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate);
}

/* 正文骨架 */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: start;
}

/* 目录 */
.page-about .about-toc__title {
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--slate);
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule);
}
.page-about .about-toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}
.page-about .about-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  white-space: nowrap;
  padding: 8px 12px;
  border-left: 3px solid transparent;
  color: var(--ink);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.4;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.page-about .about-toc__link:hover {
  background: var(--sand-2);
}
.page-about .about-toc__link[data-active] {
  background: var(--green);
  color: var(--sand);
  border-left-color: var(--cyan);
}
.page-about .about-toc__no {
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--slate);
}
.page-about .about-toc__link[data-active] .about-toc__no {
  color: var(--cyan);
}

/* 章节 */
.page-about .about-sec {
  position: relative;
  padding-top: clamp(30px, 4vw, 48px);
}
.page-about .about-sec::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 8px;
  background-image: repeating-linear-gradient(to right, var(--rule) 0 1px, transparent 1px 12px);
}
.page-about .about-sec + .about-sec {
  margin-top: clamp(44px, 6vw, 88px);
}
.page-about .about-sec__head {
  display: grid;
  gap: 6px;
  margin-bottom: 18px;
}
.page-about .about-sec__num {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--green-2);
}
.page-about .about-sec__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.14;
  letter-spacing: -0.025em;
  margin: 0;
}
.page-about .about-sec__lede {
  font-size: clamp(16.5px, 1.6vw, 19px);
  line-height: 1.8;
  max-width: 44ch;
  margin: 0 0 22px;
  padding-left: 14px;
  border-left: 3px solid var(--cyan);
  color: var(--ink);
}

.page-about .about-prose p {
  max-width: var(--about-measure);
  font-size: 17px;
  line-height: 1.85;
  margin: 0 0 16px;
}
.page-about .about-prose--after {
  max-width: var(--about-measure);
  font-size: 17px;
  line-height: 1.85;
  margin: 22px 0 0;
}

.page-about .about-link {
  display: inline-block;
  margin-top: 6px;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--green-2);
  text-decoration: none;
  border-bottom: 1px solid var(--green-2);
  padding-bottom: 2px;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.page-about .about-link:hover {
  color: var(--rust);
  border-bottom-color: var(--rust);
}
.page-about .about-link--block {
  margin-top: 16px;
}

/* 两条主线 */
.page-about .about-mainlines {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
.page-about .about-line {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--sand-2);
  border: 1px solid var(--rule);
}
.page-about .about-line--alt {
  border-color: var(--green-2);
}
.page-about .about-line__tag {
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--slate);
  margin: 0 0 10px;
}
.page-about .about-line__title {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule);
}
.page-about .about-line p {
  font-size: 16px;
  line-height: 1.8;
  margin: 0 0 12px;
}

/* 规则清单 */
.page-about .about-sheet {
  position: relative;
  background: var(--sand-2);
  border: 1px solid var(--rule);
  padding: clamp(20px, 3vw, 38px);
  margin-top: 8px;
}
.page-about .about-sheet::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 26px;
  height: 26px;
  background: linear-gradient(225deg, var(--sand) 50%, var(--rule) 50%);
}
.page-about .about-rules {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-rules__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--rule);
}
.page-about .about-rules__item:first-child {
  padding-top: 0;
}
.page-about .about-rules__item:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.page-about .about-rules__no {
  font-family: var(--font-data);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--green-2);
}
.page-about .about-rules__t {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 1.7vw, 20px);
  letter-spacing: -0.01em;
  margin-bottom: 6px;
}
.page-about .about-rules__body p {
  font-size: 16px;
  line-height: 1.8;
  margin: 0;
  max-width: var(--about-measure);
}

/* 流程 */
.page-about .about-flow__split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  align-items: start;
}
.page-about .about-steps {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
}
.page-about .about-steps li {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 12px;
  padding: 13px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 16px;
  line-height: 1.8;
}
.page-about .about-steps li:first-child {
  padding-top: 0;
}
.page-about .about-steps__n {
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--green-2);
  padding-top: 4px;
}
.page-about .about-steps strong {
  font-weight: 700;
}

/* 侧图 */
.page-about .about-sidefig {
  margin: 0;
}
.page-about .about-sidefig__frame {
  border: 1px solid var(--rule);
  background: var(--sand-2);
  overflow: hidden;
}
.page-about .about-sidefig__frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}
.page-about .about-sidefig figcaption,
.page-about .about-version__fig figcaption {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate);
}

/* 版本时间线 */
.page-about .about-version {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  align-items: start;
}
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 18px;
  width: 2px;
  background: var(--green-2);
  opacity: 0.28;
}
.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 26px 38px;
}
.page-about .about-timeline__item:last-child {
  padding-bottom: 4px;
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--sand);
  border: 2px solid var(--green-2);
  transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.page-about .about-timeline__item:hover::before {
  background: var(--orange);
  border-color: var(--orange);
}
.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-data);
  font-weight: 700;
  font-size: clamp(20px, 2.4vw, 27px);
  letter-spacing: -0.03em;
  color: var(--green);
  line-height: 1.1;
  margin-bottom: 4px;
}
.page-about .about-timeline__t {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16.5px;
  margin: 0 0 4px;
}
.page-about .about-timeline__d {
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--slate);
  margin: 0;
  max-width: 40ch;
}
.page-about .about-version__fig {
  margin: 0;
}
.page-about .about-version__frame {
  border: 1px solid var(--rule);
  background: var(--sand-2);
  overflow: hidden;
}
.page-about .about-version__frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 5 / 7;
  object-fit: cover;
}
.page-about .about-version__now {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: 28px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
  font-size: 16px;
  line-height: 1.8;
  max-width: 52ch;
}

/* 团队 */
.page-about .about-team {
  background: var(--green);
  color: var(--sand);
  padding: clamp(24px, 3.5vw, 44px);
}
.page-about .about-team__total {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 26px;
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(243, 234, 218, 0.22);
}
.page-about .about-team__num {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: clamp(48px, 7vw, 84px);
  line-height: 0.9;
  letter-spacing: -0.05em;
  color: var(--cyan);
}
.page-about .about-team__unit {
  font-size: 15.5px;
  color: rgba(243, 234, 218, 0.86);
}
.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-team__row {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 6px 16px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(243, 234, 218, 0.16);
}
.page-about .about-team__row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.page-about .about-team__count {
  grid-row: 1 / span 2;
  font-family: var(--font-data);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--orange);
}
.page-about .about-team__role {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -0.01em;
}
.page-about .about-team__desc {
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(243, 234, 218, 0.84);
  max-width: 46ch;
}

/* 边界 */
.page-about .about-bound {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: 54ch;
}
.page-about .about-bound li {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 14px;
  padding: 15px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 16.5px;
  line-height: 1.85;
}
.page-about .about-bound li:last-child {
  border-bottom: 0;
}
.page-about .about-bound__mark {
  display: block;
  width: 18px;
  height: 2px;
  margin-top: 14px;
  background: var(--rust);
}

/* 相关入口 */
.page-about .about-next {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 34px;
  background: var(--rule);
  border: 1px solid var(--rule);
}
.page-about .about-next__link {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 18px;
  background: var(--sand);
  color: var(--ink);
  text-decoration: none;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.page-about .about-next__link:hover {
  background: var(--green);
  color: var(--sand);
}
.page-about .about-next__no {
  font-family: var(--font-data);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--slate);
}
.page-about .about-next__link:hover .about-next__no {
  color: var(--cyan);
}
.page-about .about-next__t {
  font-size: 15.5px;
  font-weight: 700;
}

/* 平板与桌面 */
@media (min-width: 768px) {
  .page-about .about-mainlines {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-flow__split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(24px, 3.5vw, 48px);
  }
  .page-about .about-version {
    grid-template-columns: minmax(0, 1.35fr) minmax(200px, 0.65fr);
  }
  .page-about .about-next {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
  }
  .page-about .about-toc {
    position: sticky;
    top: 108px;
  }
  .page-about .about-toc__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .about-toc__list li + li {
    margin-top: 2px;
  }
  .page-about .about-toc__link {
    display: flex;
    white-space: normal;
    padding: 9px 12px;
  }
  .page-about .about-sec__head {
    grid-template-columns: 96px minmax(0, 1fr);
    align-items: end;
    gap: 22px;
  }
}

@media (min-width: 1280px) {
  .page-about .about-mainlines {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }
  .page-about .about-rules__item {
    grid-template-columns: 74px minmax(0, 1fr);
    gap: 20px;
  }
  .page-about .about-rules__no {
    padding-top: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__link,
  .page-about .about-timeline__item::before,
  .page-about .about-next__link,
  .page-about .about-link,
  .page-about .about-crumbs__list a {
    transition: none;
  }
}