.page-about {
  --about-gap: 1.5rem;
  --about-axis: 7rem;
  background: var(--ink);
  color: var(--text);
  overflow-x: hidden;
}

.page-about .about-crumb {
  padding-top: 1.25rem;
  padding-bottom: .5rem;
}

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

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

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding: 1.5rem 0 3rem;
  isolation: isolate;
}

.page-about .about-hero__slash {
  position: absolute;
  top: -30%;
  bottom: -20%;
  left: 38%;
  right: -25%;
  z-index: -1;
  background: linear-gradient(155deg, var(--grass) 0%, var(--ink-2) 62%, var(--ink) 100%);
  border-left: 1px solid var(--line);
  transform: skewX(-8deg);
}

.page-about .about-hero__inner {
  position: relative;
}

.page-about .about-hero__stamp {
  margin: 0 0 1rem;
  font-size: .75rem;
  letter-spacing: .18em;
  color: var(--muted);
}

.page-about .about-hero h1 {
  margin: 0 0 1.35rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.4rem, 10vw, 5.2rem);
  line-height: .98;
  letter-spacing: -.02em;
  color: var(--text);
}

.page-about .about-hero__hl {
  position: relative;
  display: inline-block;
  padding: 0 .18em;
  color: var(--ink);
  background: var(--cyan);
  transform: skewX(-7deg);
}

.page-about .about-hero__lede {
  max-width: 46rem;
  margin: 0 0 2rem;
  font-size: clamp(1rem, 2.6vw, 1.125rem);
  line-height: 1.8;
  color: var(--text);
}

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

.page-about .about-figures__item {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  padding: 1rem 1.1rem;
  background: var(--ink-2);
}

.page-about .about-figures__num {
  font-size: 1.55rem;
  font-weight: 600;
  color: var(--cyan);
  letter-spacing: -.02em;
}

.page-about .about-figures__label {
  font-size: .8125rem;
  line-height: 1.5;
  color: var(--muted);
}

/* 章节公共 */
.page-about .section {
  padding: 3rem 0;
}

.page-about .chapter-no {
  margin: 0 0 .75rem;
  font-size: .8125rem;
  letter-spacing: .22em;
  color: var(--cyan);
}

.page-about .about-cities .chapter-no {
  color: var(--grass);
}

.page-about .section h2 {
  margin: 0 0 1.15rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.7rem, 6vw, 2.6rem);
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .about-lead {
  max-width: 40rem;
  margin: 0 0 2rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-lead--ink {
  color: var(--grass);
}

.page-about .prose {
  margin: 0 0 1.1rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text);
}

/* 起点 */
.page-about .about-origin {
  border-top: 1px solid var(--line);
}

.page-about .about-origin__inner {
  max-width: 52rem;
}

.page-about .about-note {
  margin-top: 1.75rem;
  padding: 1.1rem 1.25rem;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-left: 4px solid var(--cyan);
  box-shadow: var(--shadow-paper);
}

.page-about .about-note__line {
  margin: 0 0 .4rem;
  font-size: .8125rem;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .about-note__text {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.7;
  color: var(--muted);
}

/* 时间轴 */
.page-about .about-milestones {
  background: linear-gradient(180deg, var(--ink) 0%, var(--ink-2) 18%, var(--ink-2) 82%, var(--ink) 100%);
}

.page-about .about-timeline {
  display: grid;
  gap: 1.1rem;
  margin-bottom: 2.5rem;
}

.page-about .about-node {
  display: grid;
  grid-template-columns: 1fr;
  gap: .55rem;
  padding-left: 1.1rem;
  border-left: 2px solid var(--line);
}

.page-about .about-node__year {
  margin: 0;
  font-size: 1.9rem;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--cyan);
}

.page-about .about-node__card {
  padding: 1.1rem 1.15rem;
  background: var(--ink);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform var(--ease), border-color var(--ease), box-shadow var(--ease);
}

.page-about .about-node__card:hover,
.page-about .about-node__card:focus-within {
  transform: translateY(-3px);
  border-color: var(--cyan);
  box-shadow: var(--shadow-lift);
}

.page-about .about-node__card .tag {
  display: inline-block;
  margin: 0 0 .55rem;
}

.page-about .about-node__card h3 {
  margin: 0 0 .5rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  line-height: 1.25;
  color: var(--text);
}

.page-about .about-node__card p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--muted);
}

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

.page-about .about-figure .media-frame {
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

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

.page-about .about-figure .media-caption {
  margin-top: .7rem;
  font-size: .8125rem;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-cities .about-figure .media-caption {
  color: var(--grass);
}

/* 团队 */
.page-about .about-team__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-about .about-roles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .75rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-role {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  padding: .9rem .95rem;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: background var(--ease), border-color var(--ease), transform var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  background: var(--grass);
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .about-role__num {
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-role__name {
  font-size: .9375rem;
  font-weight: 600;
  color: var(--text);
}

.page-about .about-role__desc {
  font-size: .8125rem;
  line-height: 1.6;
  color: var(--muted);
}

/* 城市观赛 */
.page-about .about-cities {
  color: var(--ink);
}

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

.page-about .about-cities__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
}

.page-about .about-cities__p {
  color: var(--ink);
}

.page-about .about-city-figures {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
  background: var(--grass);
  border: 1px solid var(--grass);
}

.page-about .about-city-figures li {
  display: flex;
  align-items: baseline;
  gap: .6rem;
  padding: .8rem 1rem;
  background: var(--paper);
}

.page-about .about-city-figures__num {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--grass);
  letter-spacing: -.02em;
}

.page-about .about-city-figures__label {
  font-size: .875rem;
  color: var(--grass);
}

.page-about .about-cities .about-figure .media-frame {
  border-color: var(--grass);
  background: var(--paper);
}

/* 下一阶段 */
.page-about .about-next {
  border-top: 1px solid var(--line);
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-bottom: 2rem;
}

.page-about .about-next__item {
  padding: 1.15rem 1.2rem;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color var(--ease), transform var(--ease);
}

.page-about .about-next__item:hover {
  border-color: var(--cyan-soft);
  transform: translateY(-2px);
}

.page-about .about-next__k {
  margin: 0 0 .5rem;
  font-size: .8125rem;
  letter-spacing: .2em;
  color: var(--orange);
}

.page-about .about-next__item h3 {
  margin: 0 0 .5rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  line-height: 1.3;
  color: var(--text);
}

.page-about .about-next__item p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--muted);
}

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

/* 路线 */
.page-about .about-routes {
  padding: 2.5rem 0 3.5rem;
  background: var(--ink-2);
  border-top: 1px solid var(--line);
}

.page-about .about-routes__title {
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.4rem;
  color: var(--text);
}

.page-about .about-routes__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: .75rem;
  margin: 0 0 1.75rem;
  padding: 0;
  list-style: none;
}

.page-about .about-route {
  display: grid;
  grid-template-columns: 2.2rem 1fr;
  grid-template-rows: auto auto;
  gap: .15rem .75rem;
  padding: .9rem 1rem;
  text-decoration: none;
  background: var(--ink);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color var(--ease), transform var(--ease), background var(--ease);
}

.page-about .about-route:hover,
.page-about .about-route:focus-visible {
  background: var(--grass);
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .about-route__k {
  grid-row: 1 / span 2;
  align-self: center;
  font-size: .8125rem;
  color: var(--cyan);
}

.page-about .about-route__t {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
}

.page-about .about-route__d {
  font-size: .8125rem;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-backtop {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .08em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: .2rem;
}

.page-about .about-backtop:hover,
.page-about .about-backtop:focus-visible {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan-soft);
}

/* 响应式 */
@media (min-width: 640px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 860px) {
  .page-about .section {
    padding: 4.5rem 0;
  }

  .page-about .about-hero {
    padding: 2.5rem 0 4.5rem;
  }

  .page-about .about-hero__slash {
    left: 46%;
    right: -18%;
  }

  .page-about .about-timeline {
    gap: 2rem;
  }

  .page-about .about-node {
    grid-template-columns: var(--about-axis) 1fr;
    gap: 1.75rem;
    padding-left: 0;
    padding-top: 1.5rem;
    border-left: none;
    border-top: 1px solid var(--line);
  }

  .page-about .about-node:nth-child(even) {
    margin-left: 3rem;
  }

  .page-about .about-node:nth-child(odd) {
    margin-right: 3rem;
  }

  .page-about .about-node__year {
    font-size: 2.4rem;
    text-align: right;
  }

  .page-about .about-team__inner {
    grid-template-columns: 1.15fr .85fr;
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-cities__grid {
    grid-template-columns: 1fr .9fr;
    gap: 3rem;
    align-items: start;
  }

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

  .page-about .about-figure--wide {
    max-width: 46rem;
  }
}

@media (min-width: 1024px) {
  .page-about .about-roles {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (max-width: 400px) {
  .page-about .about-figures {
    grid-template-columns: 1fr;
  }

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