.page-about {
  --about-rule: rgba(47, 214, 232, .22);
  --about-soft: rgba(143, 166, 196, .18);
  --about-text: #C6D6E8;
}

/* 面包屑 */
.page-about .about-crumb {
  padding-top: clamp(1rem, 3vw, 1.75rem);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: .78rem;
  letter-spacing: .05em;
  color: var(--steel);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: .45rem;
  color: var(--about-soft);
}

.page-about .breadcrumb a {
  color: var(--steel);
  text-decoration: none;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--cyan);
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--cloud-thin);
}

/* 首屏 */
.page-about .about-hero {
  padding: clamp(1.6rem, 5vw, 3rem) 0 clamp(2.5rem, 7vw, 4.5rem);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.8rem, 5vw, 3.5rem);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0 0 1.1rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 8vw, 3.6rem);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -.01em;
  color: var(--cloud);
  max-width: 20ch;
}

.page-about .about-hero__lead {
  margin: 0 0 1.5rem;
  max-width: 48ch;
  font-size: clamp(.95rem, 2.4vw, 1.05rem);
  line-height: 1.85;
  color: var(--about-text);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  border: 1px solid var(--about-rule);
  background: var(--about-rule);
}

.page-about .about-hero__fact {
  padding: .9rem 1rem 1rem;
  background: var(--ink-mid);
}

.page-about .about-hero__fact dt {
  margin-bottom: .4rem;
  font-size: .74rem;
  letter-spacing: .06em;
  color: var(--steel);
}

.page-about .about-hero__fact dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: .2rem;
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 4.4vw, 1.85rem);
  font-weight: 600;
  line-height: 1;
  color: var(--mint);
}

.page-about .about-hero__unit {
  font-size: .72rem;
  color: var(--cloud);
}

/* 主体骨架 */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  padding-bottom: clamp(2.5rem, 7vw, 5rem);
}

.page-about .about-toc {
  padding: .85rem 0;
  border-top: 1px solid var(--about-rule);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-toc__label {
  margin: 0 0 .55rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-about .about-toc__list {
  display: flex;
  gap: 1rem;
  margin: 0;
  padding: 0 0 .2rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: .4rem;
  padding: .2rem 0;
  white-space: nowrap;
  font-size: .84rem;
  color: var(--steel);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}

.page-about .about-toc__no {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--cyan);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--cloud);
}

.page-about .about-toc__link[aria-current="true"] {
  color: var(--mint);
  border-bottom-color: var(--mint);
}

/* 章节 */
.page-about .about-flow {
  display: grid;
  gap: clamp(2.5rem, 6vw, 4rem);
  min-width: 0;
}

.page-about .about-chapter {
  padding-top: clamp(1.4rem, 4vw, 2.2rem);
  border-top: 1px solid var(--about-soft);
  scroll-margin-top: 110px;
  min-width: 0;
}

.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(.8rem, 2.5vw, 1.4rem);
  align-items: start;
  margin-bottom: 1.2rem;
}

.page-about .about-chapter__index {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 7vw, 3.1rem);
  font-weight: 700;
  line-height: .9;
  color: transparent;
  -webkit-text-stroke: 1px var(--cyan);
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 5.2vw, 2.35rem);
  font-weight: 700;
  line-height: 1.16;
  letter-spacing: -.005em;
  color: var(--cloud);
}

.page-about .about-chapter__intro,
.page-about .about-lede {
  margin: 0 0 1rem;
  font-size: clamp(.95rem, 2.4vw, 1.02rem);
  line-height: 1.85;
  color: var(--about-text);
}

.page-about .about-chapter__text p {
  margin: 0 0 1rem;
  font-size: .96rem;
  line-height: 1.85;
  color: var(--about-text);
}

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

.page-about .about-chapter__split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.2rem);
  align-items: start;
}

/* 要点列表 */
.page-about .about-points {
  display: grid;
  gap: .7rem;
  margin: .4rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-points li {
  position: relative;
  padding-left: 1.35rem;
  font-size: .93rem;
  line-height: 1.8;
  color: var(--about-text);
}

.page-about .about-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: .5rem;
  height: .5rem;
  background: var(--cyan);
}

/* 图片 */
.page-about .about-figure {
  margin: 0;
}

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

.page-about .figure__caption {
  margin-top: .6rem;
  font-size: .75rem;
  line-height: 1.65;
  color: var(--steel);
}

/* 覆盖版图 */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 clamp(1.5rem, 4vw, 2.2rem);
  padding: 0;
  list-style: none;
  border: 1px solid var(--about-soft);
  background: var(--about-soft);
}

.page-about .about-stats__item {
  padding: 1rem 1.05rem 1.1rem;
  background: var(--ink-mid);
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 4.6vw, 1.75rem);
  font-weight: 600;
  line-height: 1.1;
  color: var(--mint);
}

.page-about .about-stats__label {
  margin: .35rem 0 0;
  font-size: .78rem;
  letter-spacing: .02em;
  color: var(--steel);
}

.page-about .about-map {
  display: grid;
  gap: 1.2rem;
  padding: clamp(1.1rem, 3vw, 1.6rem);
  border: 1px solid var(--about-rule);
  background: linear-gradient(160deg, rgba(19, 42, 74, .9), rgba(11, 29, 58, .92));
}

.page-about .about-map__label {
  display: flex;
  align-items: center;
  gap: .5rem;
  margin: 0 0 .7rem;
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .04em;
  color: var(--cloud);
}

.page-about .about-map__swatch {
  width: .6rem;
  height: .6rem;
  border-radius: 50%;
}

.page-about .about-map__swatch--cyan {
  background: var(--cyan);
}

.page-about .about-map__swatch--gold {
  background: var(--gold);
}

.page-about .about-map__grid {
  width: 100%;
  background-repeat: repeat;
}

.page-about .about-map__grid--foot {
  height: 72px;
  background-image: radial-gradient(circle at 3px 3px, var(--cyan) 2px, transparent 2.5px);
  background-size: 14px 14px;
}

.page-about .about-map__grid--cup {
  height: 44px;
  background-image: radial-gradient(circle at 3px 3px, var(--gold) 2px, transparent 2.5px);
  background-size: 14px 14px;
}

.page-about .about-map__note {
  margin: 0;
  padding-top: .9rem;
  border-top: 1px solid var(--about-soft);
  font-size: .83rem;
  line-height: 1.75;
  color: var(--steel);
}

/* 时间线 */
.page-about .about-timeline-figure {
  margin: 0 0 clamp(1.4rem, 4vw, 2rem);
}

.page-about .about-timeline {
  display: grid;
  gap: 1.4rem;
  margin: 0;
  padding: 0 0 0 1.5rem;
  list-style: none;
  border-left: 1px solid var(--about-rule);
}

.page-about .about-timeline__item {
  position: relative;
  transition: transform .25s ease;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1.5rem - 5px);
  top: .4rem;
  width: 10px;
  height: 10px;
  border: 2px solid var(--cyan);
  border-radius: 50%;
  background: var(--ink-deep);
  transition: border-color .25s ease, background-color .25s ease;
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  border-color: var(--gold);
  background: var(--gold);
}

.page-about .about-timeline__no {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .12em;
  color: var(--cyan);
  transition: color .25s ease;
}

.page-about .about-timeline__item:hover .about-timeline__no {
  color: var(--gold);
}

.page-about .about-timeline__title {
  margin: .2rem 0 .35rem;
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 3.4vw, 1.25rem);
  font-weight: 700;
  color: var(--cloud);
}

.page-about .about-timeline__item p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--about-text);
}

/* 团队角色 */
.page-about .about-roles {
  display: grid;
  gap: .9rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-roles__item {
  padding: .95rem 1rem;
  border-left: 2px solid var(--cyan);
  background: rgba(19, 42, 74, .55);
}

.page-about .about-roles__item:nth-child(even) {
  border-left-color: var(--gold);
}

.page-about .about-roles__name {
  margin: 0 0 .3rem;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--cloud-thin);
}

.page-about .about-roles__item p {
  margin: 0;
  font-size: .89rem;
  line-height: 1.78;
  color: var(--about-text);
}

/* 使用场景 */
.page-about .about-scenes {
  display: grid;
  gap: clamp(1rem, 3vw, 1.4rem);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-scenes__item {
  padding: clamp(1rem, 3vw, 1.4rem);
  border: 1px solid var(--about-soft);
  background: linear-gradient(180deg, rgba(19, 42, 74, .85), rgba(11, 29, 58, .7));
}

.page-about .about-scenes__who {
  margin: 0 0 .9rem;
  padding-bottom: .7rem;
  border-bottom: 1px solid var(--about-rule);
  font-family: var(--font-display);
  font-size: clamp(1rem, 3.4vw, 1.18rem);
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-scenes__flow {
  margin: 0;
  display: grid;
  gap: .6rem;
}

.page-about .about-scenes__flow dt {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .about-scenes__flow dd {
  margin: 0 0 .35rem;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--about-text);
}

/* 资质与运营 */
.page-about .about-creds {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .7rem;
  margin: 0 0 clamp(1.5rem, 4vw, 2rem);
  padding: 0;
  list-style: none;
}

.page-about .about-creds__item {
  display: flex;
  align-items: baseline;
  gap: .45rem;
  padding: .7rem .85rem;
  border: 1px solid var(--about-rule);
  font-size: .84rem;
  line-height: 1.6;
  color: var(--about-text);
  transition: border-color .22s ease, color .22s ease;
}

.page-about .about-creds__item:hover {
  border-color: var(--gold);
  color: var(--cloud);
}

.page-about .about-creds__n {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--mint);
}

.page-about .about-ops {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  border: 1px solid var(--about-soft);
  background: var(--about-soft);
}

.page-about .about-ops__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: .25rem;
  padding: .85rem 1rem;
  background: rgba(7, 17, 31, .72);
}

.page-about .about-ops__row dt {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--steel);
}

.page-about .about-ops__row dd {
  margin: 0;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--cloud);
}

.page-about .about-ops__row dd a {
  font-family: var(--font-mono);
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-ops__row dd a:hover,
.page-about .about-ops__row dd a:focus-visible {
  color: var(--mint);
  border-bottom-color: var(--mint);
}

.page-about .about-ops__note {
  margin: 1rem 0 0;
  font-size: .84rem;
  line-height: 1.8;
  color: var(--steel);
}

/* 页尾引导 */
.page-about .about-next {
  padding: clamp(2.2rem, 6vw, 3.5rem) 0;
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.2rem, 4vw, 2.5rem);
  align-items: center;
}

.page-about .about-next__eyebrow {
  margin: 0 0 .5rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-next__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 5vw, 2rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--cloud);
}

.page-about .about-next__links {
  display: grid;
  gap: .6rem;
}

.page-about .about-next__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .85rem 1rem;
  border: 1px solid var(--about-rule);
  font-size: .92rem;
  color: var(--cloud);
  text-decoration: none;
  transition: border-color .22s ease, background-color .22s ease, color .22s ease;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: var(--mint);
  background: rgba(92, 255, 196, .08);
  color: var(--mint);
}

/* 响应式 */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-ops__row {
    grid-template-columns: 130px minmax(0, 1fr);
    align-items: baseline;
    gap: 1rem;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
    align-items: end;
  }

  .page-about .about-body {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.25rem);
  }

  .page-about .about-toc {
    position: sticky;
    top: 104px;
    align-self: start;
    padding: .2rem 0 .2rem 1rem;
    border-top: 0;
    border-bottom: 0;
    border-left: 1px solid var(--about-rule);
  }

  .page-about .about-toc__list {
    display: grid;
    gap: .1rem;
    overflow: visible;
  }

  .page-about .about-toc__link {
    display: flex;
    padding: .42rem 0;
    white-space: normal;
    line-height: 1.5;
  }

  .page-about .about-chapter__split {
    grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
  }

  .page-about .about-chapter__split--reverse {
    grid-template-columns: minmax(0, 2fr) minmax(0, 3fr);
  }

  .page-about .about-chapter__split--reverse .about-figure {
    order: -1;
  }

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

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

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__link,
  .page-about .about-creds__item,
  .page-about .about-next__link,
  .page-about .about-timeline__item,
  .page-about .about-timeline__item::before,
  .page-about .about-timeline__no {
    transition: none;
  }
}
</main>