.page-about {
  --about-band: repeating-linear-gradient(
    115deg,
    var(--orange-600) 0 22px,
    var(--terracotta) 22px 44px,
    var(--cyan-400) 44px 52px,
    transparent 52px 74px
  );
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.5rem, 4vw, 2.75rem) 0 clamp(2rem, 5vw, 3.5rem);
  background: linear-gradient(158deg, var(--navy-800) 0%, var(--navy-900) 58%, #061527 100%);
  color: var(--cream);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -28%;
  right: -10%;
  width: 46vw;
  height: 158%;
  background: repeating-linear-gradient(
    112deg,
    transparent 0 18px,
    rgba(53, 208, 186, 0.08) 18px 20px
  );
  transform: skewX(-8deg);
  pointer-events: none;
}

.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8125rem;
  color: rgba(245, 241, 232, 0.6);
}

.page-about .about-hero .breadcrumb a {
  color: rgba(245, 241, 232, 0.88);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .about-hero .breadcrumb a:hover,
.page-about .about-hero .breadcrumb a:focus-visible {
  color: var(--cyan-400);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.75rem);
  margin-top: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-hero .eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--cyan-400);
  margin: 0;
}

.page-about .about-hero h1 {
  margin: 0.6rem 0 0;
  font-size: clamp(2rem, 6vw, 3.4rem);
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--white);
}

.page-about .about-hero__lede {
  margin: 1rem 0 0;
  max-width: 46ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.84);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.6rem;
}

/* 章节索引 */
.page-about .about-index {
  padding: 1.05rem 1.15rem 1.2rem;
  background: rgba(245, 241, 232, 0.06);
  border-left: 3px solid var(--orange-600);
}

.page-about .about-index__title {
  margin: 0 0 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--cyan-400);
}

.page-about .about-index ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.2rem;
}

.page-about .about-index a {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.32rem 0.45rem;
  border-radius: 4px;
  font-size: 0.9rem;
  line-height: 1.5;
  color: rgba(245, 241, 232, 0.88);
  text-decoration: none;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  background: rgba(53, 208, 186, 0.14);
  color: var(--white);
}

.page-about .about-index .mono {
  flex: none;
  font-size: 0.78rem;
  color: var(--orange-600);
  letter-spacing: 0.06em;
}

.page-about .about-index a:hover .mono,
.page-about .about-index a:focus-visible .mono {
  color: var(--cyan-400);
}

/* 首屏数字条 */
.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(2rem, 5vw, 3rem) 0 0;
  background: rgba(245, 241, 232, 0.16);
  border: 1px solid rgba(245, 241, 232, 0.16);
}

.page-about .about-hero__stats > div {
  padding: 0.95rem 1.05rem 1.1rem;
  background: var(--navy-900);
}

.page-about .about-hero__stats dt {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: rgba(245, 241, 232, 0.6);
}

.page-about .about-hero__stats dd {
  margin: 0.35rem 0 0;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3vw, 1.7rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--white);
}

.page-about .about-unit {
  margin-left: 0.25em;
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0;
  color: rgba(245, 241, 232, 0.62);
}

/* ---------- 通用章节骨架 ---------- */

.page-about .about-chapter {
  position: relative;
  padding: clamp(2.25rem, 5.5vw, 3.5rem) 0;
}

.page-about .about-chapter + .about-chapter::before {
  content: "";
  position: absolute;
  top: 0;
  left: var(--gutter);
  right: var(--gutter);
  height: 4px;
  background: var(--about-band);
  opacity: 0.8;
}

.page-about .about-chapter__inner {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .about-chapter__aside {
  position: relative;
  padding-left: 1.05rem;
  border-left: 3px solid var(--orange-600);
}

.page-about .about-chapter__num {
  display: block;
  font-size: clamp(2.1rem, 5.5vw, 3rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--orange-600);
}

.page-about .about-chapter__aside h2 {
  margin: 0.55rem 0 0.8rem;
  font-size: clamp(1.25rem, 2.5vw, 1.6rem);
  line-height: 1.3;
  color: var(--navy-800);
}

.page-about .about-chapter__points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .about-chapter__points li {
  position: relative;
  padding-left: 0.95rem;
}

.page-about .about-chapter__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  background: var(--cyan-400);
  transform: rotate(45deg);
}

.page-about .about-chapter__detail > p {
  margin: 0 0 1rem;
  max-width: 64ch;
  line-height: 1.85;
  color: var(--ink);
}

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

.page-about .about-chapter__detail a {
  color: var(--orange-deep);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--dur) var(--ease);
}

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

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: clamp(1.5rem, 3.5vw, 2rem) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  object-fit: cover;
  background: var(--navy-700);
}

.page-about .about-figure--tall img {
  max-width: 20rem;
  aspect-ratio: 3 / 4;
}

.page-about .about-figure--band {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}

.page-about .about-figure--band img {
  aspect-ratio: 2 / 1;
  border-radius: 0;
}

.page-about .about-figure figcaption,
.page-about .about-banner figcaption {
  margin-top: 0.6rem;
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--ink-soft);
}

.page-about .about-banner {
  position: relative;
  margin: 0 0 1.75rem;
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .about-banner figcaption {
  margin-top: 0.6rem;
}

/* ---------- 数字索引卡 ---------- */

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  margin: clamp(1.5rem, 3.5vw, 2rem) 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stats--wide {
  margin-top: 1.25rem;
}

.page-about .about-stats > div {
  padding: 0.9rem 1rem 1rem;
  background: var(--white);
}

.page-about .about-stats dt {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

.page-about .about-stats dd {
  margin: 0.32rem 0 0;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3vw, 1.6rem);
  font-weight: 700;
  line-height: 1.15;
  color: var(--carbon);
}

.page-about .about-stats dd span {
  margin-left: 0.22em;
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--ink-soft);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.5rem;
  position: relative;
  display: grid;
  gap: 1.5rem;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: linear-gradient(180deg, var(--orange-600), var(--terracotta) 55%, var(--moss));
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -1.5rem;
  top: 0.42rem;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--cream);
  border: 2px solid var(--orange-600);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  background: var(--cyan-400);
  border-color: var(--cyan-deep);
}

.page-about .about-timeline__year {
  display: inline-block;
  padding: 0.1rem 0.55rem;
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--orange-deep);
  background: rgba(228, 87, 46, 0.1);
  border-radius: 3px;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__year,
.page-about .about-timeline__item:focus-within .about-timeline__year {
  background: var(--orange-600);
  color: var(--white);
}

.page-about .about-timeline__title {
  margin: 0.5rem 0 0.28rem;
  font-size: 1.05rem;
  line-height: 1.4;
  color: var(--navy-800);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 58ch;
  font-size: 0.925rem;
  line-height: 1.78;
  color: var(--ink-soft);
}

/* ---------- 赛季切换器 ---------- */

.page-about .about-season {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin: 1.4rem 0 0;
  padding: 0.95rem 1.05rem 1.05rem;
  background: var(--white);
  border-left: 3px solid var(--navy-800);
  border-radius: 0 var(--radius) var(--radius) 0;
  box-shadow: var(--shadow-1);
}

.page-about .about-season .season-switcher__label {
  margin-right: 0.25rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

/* ---------- 协作列表 ---------- */

.page-about .about-partners {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.page-about .about-partners li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.9rem;
  align-items: start;
  padding: 0.9rem 1rem 1rem;
  background: var(--white);
  border-left: 3px solid var(--terracotta);
  border-radius: 0 var(--radius) var(--radius) 0;
  box-shadow: var(--shadow-1);
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--ink);
}

.page-about .about-partners__n {
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--moss);
}

/* ---------- 结尾行动 ---------- */

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-top: 1.6rem;
  padding: 1.15rem 1.25rem 1.25rem;
  background: var(--navy-800);
  color: var(--cream);
  border-radius: var(--radius);
}

.page-about .about-cta__text {
  margin: 0;
  flex: 1 1 15rem;
  font-size: 0.95rem;
  line-height: 1.7;
  color: rgba(245, 241, 232, 0.86);
}

/* ---------- 断点 ---------- */

@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-chapter__inner {
    grid-template-columns: minmax(0, 20rem) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
  }

  .page-about .about-chapter__aside {
    position: sticky;
    top: 1.5rem;
  }

  .page-about .about-figure--band {
    margin-left: calc(var(--gutter) * -1);
    margin-right: calc(var(--gutter) * -1);
  }

  .page-about .about-figure--band img {
    border-radius: var(--radius);
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.78fr);
    align-items: end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index a,
  .page-about .about-timeline__item::before,
  .page-about .about-timeline__year,
  .page-about .about-chapter__detail a {
    transition: none;
  }
}