.page-about {
  --about-rail: 104px;
  background: var(--void);
  color: var(--paper);
  font-family: var(--font-body);
}

.page-about .about-top {
  padding-top: clamp(14px, 3vw, 26px);
}

.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .section__title {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(26px, 4.2vw, 46px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--paper);
  max-width: 24ch;
}

.page-about .numeral {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.page-about .media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--rail);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  padding-block: clamp(30px, 5vw, 62px) clamp(34px, 5vw, 70px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__main {
  position: relative;
  padding-left: clamp(0px, 1vw, 18px);
}

.page-about .about-hero__main::before {
  content: "";
  display: block;
  width: 56px;
  height: 3px;
  background: var(--cyan);
  margin-bottom: 18px;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(34px, 8vw, 76px);
  line-height: 1.02;
  letter-spacing: -0.025em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 60ch;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  align-self: start;
  border-top: 1px solid var(--line);
}

.page-about .hero-fact {
  display: grid;
  grid-template-columns: minmax(64px, auto) 1fr;
  align-items: baseline;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .hero-fact__num {
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .hero-fact__txt {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .hero-fact__txt strong {
  display: block;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  padding-block: clamp(40px, 6vw, 82px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-origin__p {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--paper);
}

.page-about .about-origin__p + .about-origin__p {
  color: var(--mist);
}

.page-about .about-origin__list {
  list-style: none;
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .origin-item {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 12px;
  align-items: start;
  padding: 14px 16px;
  background: var(--void);
}

.page-about .origin-item__num {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--terracotta);
  padding-top: 3px;
}

.page-about .origin-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-origin__media {
  aspect-ratio: 3 / 2;
  align-self: start;
}

/* ---------- 内容生产流程 ---------- */
.page-about .about-flow {
  background: var(--panel);
  border-block: 1px solid var(--line);
  padding-block: clamp(40px, 6vw, 82px);
}

.page-about .about-flow__head {
  display: grid;
  gap: 18px;
}

.page-about .about-flow__intro {
  margin: 0;
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-flow__media {
  margin-top: clamp(24px, 4vw, 40px);
  aspect-ratio: 16 / 10;
  clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
}

.page-about .flow {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .flow__node {
  position: relative;
  padding: 30px 18px 22px;
  background: var(--void);
  transition: background var(--t-fast) var(--ease);
}

.page-about .flow__node::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: var(--cyan);
}

.page-about .flow__node:nth-child(2)::after { background: var(--moss); }
.page-about .flow__node:nth-child(3)::after { background: var(--terracotta); }
.page-about .flow__node:nth-child(4)::after { background: var(--lime); }

.page-about .flow__node:hover,
.page-about .flow__node:focus-visible,
.page-about .flow__node:focus {
  background: var(--rail);
  outline: none;
}

.page-about .flow__node:focus-visible {
  box-shadow: 0 0 0 2px var(--cyan);
}

.page-about .flow__num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .flow__title {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .flow__brief {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .flow__more {
  display: grid;
  grid-template-rows: 1fr;
}

.page-about .flow__more > p {
  overflow: hidden;
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--paper);
  border-top: 1px solid var(--line);
  padding-top: 10px;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  padding-block: clamp(40px, 6vw, 82px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-team__p {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--paper);
}

.page-about .team__list {
  list-style: none;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .team__role {
  padding: 16px 18px;
  background: var(--void);
  border-left: 2px solid var(--moss);
}

.page-about .team__role:nth-child(2) { border-left-color: var(--cyan); }
.page-about .team__role:nth-child(3) { border-left-color: var(--magenta); }

.page-about .team__role-name {
  margin: 0;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .team__role p {
  margin: 6px 0 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-team__note {
  margin: 20px 0 0;
  max-width: 60ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.page-about .about-team__media {
  aspect-ratio: 4 / 3;
  align-self: start;
}

/* ---------- 赛季演进 ---------- */
.page-about .about-seasons {
  padding-block: clamp(40px, 6vw, 82px);
  border-bottom: 1px solid var(--line);
}

.page-about .seasons__intro {
  margin: 16px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .seasons {
  display: grid;
  gap: 20px;
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .seasons__rail {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding-block: 10px;
}

.page-about .seasons__rail-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
  margin-bottom: 8px;
}

.page-about .seasons__rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .seasons__rail-list a {
  display: inline-block;
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  border: 1px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .seasons__rail-list a:hover,
.page-about .seasons__rail-list a:focus-visible {
  color: var(--void);
  background: var(--cyan);
  border-color: var(--cyan);
  outline: none;
}

.page-about .seasons__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .seasons__item {
  display: grid;
  gap: 10px;
  padding-block: 22px;
  border-top: 1px solid var(--line);
  scroll-margin-top: 120px;
}

.page-about .seasons__item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .seasons__year {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .seasons__year .numeral {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--terracotta);
}

.page-about .seasons__era {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .seasons__card {
  border: 1px solid var(--line);
  padding: 16px 18px;
  background: var(--void);
  transition: border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}

.page-about .seasons__item:target .seasons__card {
  border-color: var(--cyan);
  background: var(--panel);
}

.page-about .seasons__item:target .seasons__year .numeral {
  color: var(--cyan);
}

.page-about .seasons__card-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .seasons__card > p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .seasons__points {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.page-about .seasons__points li {
  position: relative;
  padding-left: 16px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--paper);
}

.page-about .seasons__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  background: var(--moss);
}

/* ---------- 数据与准则 ---------- */
.page-about .about-standards {
  background: var(--panel);
  border-block: 1px solid var(--line);
  padding-block: clamp(40px, 6vw, 82px);
}

.page-about .standards__inner {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .standards__text p {
  margin: 18px 0 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .standards__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  align-self: start;
}

.page-about .standards__item {
  padding: 18px 18px 20px;
  background: var(--void);
}

.page-about .standards__num {
  margin: 0;
  font-size: clamp(30px, 4.4vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .standards__item:nth-child(2) .standards__num { color: var(--lime); }
.page-about .standards__item:nth-child(3) .standards__num { color: var(--magenta); }
.page-about .standards__item:nth-child(4) .standards__num { color: var(--amber); }

.page-about .standards__item h3 {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-about .standards__item p:last-child {
  margin: 6px 0 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 体量 ---------- */
.page-about .about-scale {
  padding-block: clamp(40px, 6vw, 82px);
  border-bottom: 1px solid var(--line);
}

.page-about .scale__intro {
  margin: 16px 0 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .scale__stats {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .scale__stat {
  padding: 20px 18px 22px;
  background: var(--void);
}

.page-about .scale__num {
  margin: 0;
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .scale__stat:nth-child(2) .scale__num { color: var(--lime); }
.page-about .scale__stat:nth-child(3) .scale__num { color: var(--terracotta); }
.page-about .scale__stat:nth-child(4) .scale__num { color: var(--magenta); }

.page-about .scale__unit {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.04em;
  margin-left: 6px;
  color: var(--mist);
}

.page-about .scale__stat h3 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-about .scale__stat p:last-child {
  margin: 8px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding-block: clamp(40px, 6vw, 82px);
}

.page-about .next__links {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .next__link {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 10px 18px;
  padding: 20px 18px;
  background: var(--void);
  text-decoration: none;
  transition: background var(--t-fast) var(--ease);
}

.page-about .next__link:hover,
.page-about .next__link:focus-visible {
  background: var(--rail);
  outline: none;
}

.page-about .next__link:focus-visible {
  box-shadow: inset 0 0 0 2px var(--cyan);
}

.page-about .next__label {
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .next__desc {
  grid-column: 1 / 2;
  font-size: 14px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .next__arrow {
  grid-row: 1 / 3;
  grid-column: 2 / 3;
  font-family: var(--font-mono);
  font-size: 22px;
  color: var(--cyan);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .scale__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .seasons__item {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
  }

  .page-about .seasons__year {
    flex-direction: column;
    gap: 4px;
  }

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

  .page-about .next__link {
    grid-template-columns: 1fr;
    align-content: start;
    min-height: 100%;
  }

  .page-about .next__arrow {
    grid-row: auto;
    grid-column: 1 / 2;
    margin-top: 12px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.65fr) minmax(260px, 1fr);
    align-items: start;
  }

  .page-about .about-origin {
    grid-template-columns: minmax(0, 1fr) minmax(300px, 0.72fr);
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.35fr) minmax(280px, 1fr);
    align-items: start;
  }

  .page-about .about-flow__head {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
    align-items: end;
    gap: 32px;
  }

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

  .page-about .flow__more {
    grid-template-rows: 0fr;
    opacity: 0;
    transition: grid-template-rows 180ms var(--ease), opacity 180ms var(--ease);
  }

  .page-about .flow__node:hover .flow__more,
  .page-about .flow__node:focus .flow__more,
  .page-about .flow__node:focus-within .flow__more {
    grid-template-rows: 1fr;
    opacity: 1;
  }

  .page-about .standards__inner {
    grid-template-columns: minmax(0, 1fr) minmax(320px, 0.85fr);
    align-items: start;
  }

  .page-about .seasons {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .seasons__rail {
    position: sticky;
    top: 96px;
    align-self: start;
    border-bottom: none;
    border-top: none;
    padding-block: 0;
  }

  .page-about .seasons__rail-list {
    flex-direction: column;
    overflow-x: visible;
    gap: 2px;
    border-left: 1px solid var(--line);
  }

  .page-about .seasons__rail-list a {
    position: relative;
    padding: 8px 0 8px 14px;
    border: none;
  }

  .page-about .seasons__rail-list a::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: transparent;
    transition: background var(--t-fast) var(--ease);
  }

  .page-about .seasons__rail-list a:hover,
  .page-about .seasons__rail-list a:focus-visible {
    background: transparent;
    color: var(--cyan);
  }

  .page-about .seasons__rail-list a:hover::before,
  .page-about .seasons__rail-list a:focus-visible::before {
    background: var(--cyan);
  }

  .page-about .seasons__item {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 28px;
  }
}

@media (min-width: 1280px) {
  .page-about .scale__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.8fr) minmax(320px, 1fr);
    gap: 64px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .flow__more,
  .page-about .next__link,
  .page-about .seasons__card,
  .page-about .flow__node,
  .page-about .seasons__rail-list a {
    transition: none;
  }
}