.page-about {
  --about-rail-w: 216px;
  --about-gap: clamp(20px, 4vw, 56px);
  --about-radius: 14px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(40px, 7vw, 96px) 0 clamp(36px, 5vw, 72px);
  background:
    radial-gradient(110% 85% at 84% 4%, rgba(52, 242, 206, .12), transparent 58%),
    radial-gradient(95% 80% at 4% 100%, rgba(92, 23, 48, .42), transparent 62%),
    linear-gradient(160deg, var(--kt-indigo) 0%, var(--kt-night) 78%);
  border-bottom: 1px solid var(--kt-line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto -80px -140px auto;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 139, 61, .18), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  grid-template-areas:
    "crumb"
    "lead"
    "stats";
  gap: clamp(22px, 3.5vw, 38px);
}

.page-about .about-hero__crumb {
  grid-area: crumb;
}

.page-about .about-hero__lead {
  grid-area: lead;
  max-width: 44ch;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(38px, 6.4vw, 84px);
  font-weight: 500;
  line-height: 1.02;
  letter-spacing: -.02em;
  color: var(--kt-text);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  font-size: 17px;
  line-height: 1.85;
  color: var(--kt-muted);
}

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

.page-about .about-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px;
  background: var(--kt-glass);
  backdrop-filter: blur(6px);
}

.page-about .about-stat__v {
  font-size: 30px;
  font-weight: 600;
  line-height: 1;
  color: var(--kt-cyan);
}

.page-about .about-stat__u {
  font-size: 15px;
  margin-left: 2px;
  color: var(--kt-cyan);
}

.page-about .about-stat__k {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--kt-muted);
}

/* ---------- 主体网格 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding-block: 36px 0;
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--kt-muted);
}

.page-about .about-rail__nav {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: none;
}

.page-about .about-rail__nav::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__link {
  position: relative;
  display: block;
  flex: 0 0 auto;
  padding: 8px 14px;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--kt-muted);
  text-decoration: none;
  border: 1px solid var(--kt-line);
  border-radius: 999px;
  background: var(--kt-glass);
  transition: color .24s ease, border-color .24s ease, background .24s ease;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--kt-text);
  border-color: rgba(52, 242, 206, .45);
}

.page-about .about-rail__link.is-active {
  color: var(--kt-night);
  background: var(--kt-cyan);
  border-color: var(--kt-cyan);
}

.page-about .about-flow {
  min-width: 0;
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  padding: clamp(32px, 5vw, 64px) 0;
  border-top: 1px solid var(--kt-line);
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-chapter__title {
  margin: 0 0 18px;
  font-size: clamp(24px, 3.6vw, 34px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--kt-text);
}

.page-about .about-chapter__sub {
  margin: -8px 0 24px;
  font-size: 14px;
  color: var(--kt-muted);
}

.page-about .about-chapter__prose {
  margin-bottom: 26px;
}

.page-about .about-chapter__prose p {
  margin: 0 0 18px;
  font-size: 17px;
  line-height: 1.85;
  color: var(--kt-text);
}

.page-about .about-chapter__prose a {
  color: var(--kt-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(52, 242, 206, .45);
  padding-bottom: 1px;
}

.page-about .about-chapter__prose a:hover {
  border-bottom-color: var(--kt-cyan);
}

/* ---------- 起点 ---------- */
.page-about .about-origin__marks {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-origin__marks li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 18px;
  border-left: 3px solid var(--kt-orange);
  background: linear-gradient(90deg, rgba(255, 139, 61, .12), transparent 72%);
  border-radius: 0 10px 10px 0;
}

.page-about .about-origin__marks li span:first-child {
  font-size: 22px;
  font-weight: 600;
  color: var(--kt-orange);
  min-width: 62px;
}

.page-about .about-origin__marks li span:last-child {
  font-size: 15px;
  line-height: 1.6;
  color: var(--kt-text);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 6px 0 28px;
}

/* ---------- 团队分工 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
}

.page-about .about-roles__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding: 22px 0;
  border-top: 1px solid var(--kt-line);
}

.page-about .about-roles__row:first-child {
  border-top: 0;
  padding-top: 6px;
}

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

.page-about .about-roles__tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--kt-text);
}

.page-about .about-roles__tag .kt-num {
  font-size: 12px;
  color: var(--kt-cyan);
  letter-spacing: .1em;
}

.page-about .about-roles__row p {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--kt-muted);
}

.page-about .about-note {
  margin: 26px 0 0;
  padding: 20px 22px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--kt-text);
  background: var(--kt-glass);
  border: 1px solid var(--kt-line);
  border-radius: var(--about-radius);
  backdrop-filter: blur(8px);
}

.page-about .about-note .kt-num {
  color: var(--kt-cyan);
  font-weight: 600;
}

/* ---------- 战报流程 ---------- */
.page-about .about-report {
  display: grid;
  gap: 26px;
  margin-bottom: 26px;
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-steps__item {
  position: relative;
  padding: 20px 20px 20px 22px;
  background: linear-gradient(140deg, rgba(21, 27, 63, .95), rgba(11, 47, 50, .55));
  border: 1px solid var(--kt-line);
  border-radius: var(--about-radius);
  transition: transform .24s ease, border-color .24s ease;
}

.page-about .about-steps__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  bottom: 20px;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: var(--kt-orange);
  transition: background .24s ease, box-shadow .24s ease;
}

.page-about .about-steps__item:hover,
.page-about .about-steps__item:focus-within {
  transform: translateX(4px);
  border-color: rgba(52, 242, 206, .4);
}

.page-about .about-steps__item:hover::before {
  background: var(--kt-cyan);
  box-shadow: 0 0 14px rgba(52, 242, 206, .7);
}

.page-about .about-steps__n {
  display: block;
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--kt-cyan);
  margin-bottom: 8px;
}

.page-about .about-steps__t {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--kt-text);
}

.page-about .about-steps__d {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--kt-muted);
}

/* ---------- 赛季时间轴 ---------- */
.page-about .about-timeline {
  overflow-x: auto;
  padding: 22px 2px 14px;
  margin: 0 -4px;
  scroll-snap-type: x proximity;
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0;
  min-width: max-content;
}

.page-about .about-timeline__item {
  position: relative;
  flex: 0 0 auto;
  width: 74vw;
  max-width: 268px;
  padding: 26px 22px 4px 0;
  scroll-snap-align: start;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 4px;
  right: 0;
  top: 11px;
  height: 2px;
  background: linear-gradient(90deg, var(--kt-orange), rgba(52, 242, 206, .35));
}

.page-about .about-timeline__item:last-child::before {
  background: linear-gradient(90deg, var(--kt-orange), rgba(255, 139, 61, .1));
}

.page-about .about-timeline__dot {
  position: absolute;
  left: 0;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--kt-night);
  border: 3px solid var(--kt-orange);
  box-shadow: 0 0 0 4px rgba(255, 139, 61, .14);
}

.page-about .about-timeline__round {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--kt-orange);
}

.page-about .about-timeline__t {
  margin: 0 0 12px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--kt-text);
}

.page-about .about-timeline__more {
  border-top: 1px solid var(--kt-line);
  padding-top: 10px;
}

.page-about .about-timeline__more summary {
  cursor: pointer;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--kt-cyan);
  list-style: none;
}

.page-about .about-timeline__more summary::-webkit-details-marker {
  display: none;
}

.page-about .about-timeline__more summary::after {
  content: " ＋";
  font-size: 12px;
}

.page-about .about-timeline__more[open] summary::after {
  content: " －";
}

.page-about .about-timeline__more p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--kt-muted);
}

.page-about .about-timeline__hint {
  margin: 10px 0 0;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--kt-muted);
}

/* ---------- 内容做法 ---------- */
.page-about .about-craft__list {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-craft__item {
  display: flex;
  gap: 16px;
  padding: 24px 22px !important;
  border-radius: var(--about-radius);
}

.page-about .about-craft__n {
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--kt-cyan);
  padding-top: 4px;
}

.page-about .about-craft__t {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--kt-white);
}

.page-about .about-craft__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(230, 237, 248, .88);
}

.page-about .about-craft__figure {
  margin: 0;
}

/* ---------- 数据来源 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 26px;
}

.page-about .about-partners__stats {
  display: grid;
  gap: 1px;
  background: var(--kt-line);
  border: 1px solid var(--kt-line);
  border-radius: var(--about-radius);
  overflow: hidden;
}

.page-about .about-partners__stat {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 18px 20px;
  background: var(--kt-glass);
}

.page-about .about-partners__stat .kt-num {
  font-size: 26px;
  font-weight: 600;
  color: var(--kt-cyan);
  min-width: 46px;
}

.page-about .about-partners__stat span:last-child {
  font-size: 14px;
  color: var(--kt-muted);
}

.page-about .about-partners__prose p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--kt-text);
}

.page-about .about-partners__prose a {
  color: var(--kt-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(52, 242, 206, .45);
}

/* ---------- 尾段 ---------- */
.page-about .about-outro {
  margin: 8px 0 clamp(44px, 7vw, 84px);
  padding: clamp(28px, 4vw, 46px) clamp(22px, 4vw, 46px);
  border-radius: var(--about-radius);
  background:
    radial-gradient(120% 130% at 88% 0%, rgba(52, 242, 206, .16), transparent 58%),
    linear-gradient(150deg, rgba(92, 23, 48, .75), rgba(21, 27, 63, .95));
  border: 1px solid var(--kt-line);
}

.page-about .about-outro__line {
  margin: 16px 0 26px;
  max-width: 34ch;
  font-size: clamp(20px, 2.8vw, 28px);
  font-weight: 500;
  line-height: 1.55;
  letter-spacing: -.01em;
  color: var(--kt-white);
}

.page-about .about-outro__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.page-about .about-outro__text-link {
  font-size: 14px;
  color: var(--kt-muted);
  text-decoration: none;
  border-bottom: 1px solid var(--kt-line);
  padding-bottom: 2px;
}

.page-about .about-outro__text-link:hover {
  color: var(--kt-cyan);
  border-bottom-color: var(--kt-cyan);
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    grid-template-areas:
      "crumb crumb"
      "lead stats";
    align-items: end;
  }

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

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

  .page-about .about-origin__marks li {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

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

  .page-about .about-roles__row {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
  }

  .page-about .about-note {
    font-size: 16px;
  }

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

  .page-about .about-partners__stat {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-gap);
    padding-block: 64px 0;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
  }

  .page-about .about-rail__nav {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    padding: 9px 0 9px 16px;
    border: 0;
    border-left: 1px solid var(--kt-line);
    border-radius: 0;
    background: transparent;
    letter-spacing: .06em;
    white-space: nowrap;
    transition: color .24s ease;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: transparent;
    color: var(--kt-text);
  }

  .page-about .about-rail__link.is-active {
    background: transparent;
    color: var(--kt-text);
  }

  .page-about .about-rail__link.is-active::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 10px;
    bottom: 10px;
    width: 2px;
    border-radius: 2px;
    background: var(--kt-cyan);
    box-shadow: 0 0 10px rgba(52, 242, 206, .7);
  }

  .page-about .about-report {
    grid-template-columns: minmax(0, 0.62fr) minmax(0, 1fr);
    gap: 30px;
    align-items: start;
  }

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

  .page-about .about-report__figure {
    margin: 0;
  }

  .page-about .about-craft__wrap {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.85fr);
    gap: 28px;
    align-items: start;
  }

  .page-about .about-craft__item:nth-child(2) {
    margin-left: 34px;
  }

  .page-about .about-craft__figure {
    position: sticky;
    top: 104px;
    margin: 0;
  }

  .page-about .about-partners {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 34px;
    align-items: start;
  }

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

  .page-about .about-partners__stat {
    flex-direction: row;
    align-items: baseline;
  }

  .page-about .about-timeline__item {
    width: 278px;
  }

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

@media (min-width: 1280px) {
  .page-about .about-timeline__item {
    width: 300px;
  }
}

/* ---------- 动效退化 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-steps__item,
  .page-about .about-rail__link,
  .page-about .about-steps__item::before {
    transition: none;
  }

  .page-about .about-steps__item:hover {
    transform: none;
  }
}
</main>