.page-about {
  --about-gutter: 18px;
  --about-radius: var(--r-lg);
  background: var(--ink-900);
  color: var(--silver);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding: 22px 0 2px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--grass);
  border-bottom-color: var(--grass-line);
}

.page-about .breadcrumb__sep {
  margin: 0 8px;
  color: var(--line);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 24px 0 50px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(120% 68% at 10% 0%, var(--grass-dim), transparent 62%),
    radial-gradient(88% 58% at 94% 6%, var(--amber-dim), transparent 70%);
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: 32px;
}

.page-about .about-hero__lead .eyebrow {
  margin: 0 0 14px;
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-title);
  font-size: clamp(29px, 7vw, 50px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--frost);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

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

.page-about .about-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px;
  background: var(--ink-800);
}

.page-about .about-hero__stats .num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 4.6vw, 28px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--grass);
}

.page-about .about-hero__stats li > span:last-child {
  font-size: 13px;
  line-height: 1.55;
  color: var(--mist);
}

.page-about .about-hero__side {
  display: none;
}

/* ---------- 通用区块 ---------- */
.page-about .about-block {
  padding: 52px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-block .section-head {
  margin: 0 0 28px;
}

.page-about .section-head__title {
  margin: 8px 0 0;
  font-family: var(--font-title);
  font-size: clamp(23px, 4.6vw, 33px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -.005em;
  color: var(--frost);
}

.page-about .lede {
  margin: 12px 0 0;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.82;
  color: var(--mist);
}

.page-about .about-block p {
  font-size: 16px;
  line-height: 1.82;
  color: var(--mist);
}

/* ---------- 图片容器 ---------- */
.page-about .figure {
  display: block;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  overflow: hidden;
  background: linear-gradient(150deg, var(--ink-800), var(--ink-950));
}

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

.page-about .figure__cap {
  position: static;
  display: block;
  padding: 12px 18px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
  background: var(--ink-950);
  border-top: 1px solid var(--line);
}

/* ---------- 品牌起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-origin__body p {
  margin: 0;
}

.page-about .about-origin__body p + p {
  margin-top: 16px;
}

/* ---------- 团队协作 ---------- */
.page-about .about-groups {
  display: grid;
  gap: 14px;
}

.page-about .about-group {
  position: relative;
  padding: 26px 22px 24px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(165deg, var(--ink-800) 0%, var(--ink-900) 100%);
  transition: border-color .22s ease, transform .22s ease;
}

.page-about .about-group::before {
  content: "";
  position: absolute;
  left: 22px;
  right: 22px;
  top: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--grass), transparent);
  opacity: 0;
  transition: opacity .22s ease;
}

.page-about .about-group:hover,
.page-about .about-group:focus-within {
  border-color: var(--grass-line);
  transform: translateY(-3px);
}

.page-about .about-group:hover::before,
.page-about .about-group:focus-within::before {
  opacity: 1;
}

.page-about .about-group__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--grass);
}

.page-about .about-group__title {
  margin: 10px 0 10px;
  font-family: var(--font-title);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--frost);
}

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

.page-about .about-group__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-group__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--silver);
}

.page-about .about-group__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--grass);
  opacity: .72;
}

/* ---------- 比赛日节奏 ---------- */
.page-about .about-rhythm {
  display: grid;
  gap: 24px;
  margin-top: 34px;
}

.page-about .about-rhythm__body h3 {
  margin: 0 0 12px;
  font-family: var(--font-title);
  font-size: 21px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--frost);
}

.page-about .about-rhythm__body p {
  margin: 0;
}

.page-about .about-rhythm__body p + p {
  margin-top: 14px;
}

/* ---------- 场馆信息 ---------- */
.page-about .about-venue__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-venue__body p {
  margin: 0;
}

.page-about .about-venue__body p + p {
  margin-top: 16px;
}

/* ---------- 数字面板 ---------- */
.page-about .about-numbers {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: var(--line);
  overflow: hidden;
}

.page-about .about-numbers li {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 18px;
  background: var(--ink-800);
}

.page-about .about-numbers .num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 4.4vw, 32px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--grass);
}

.page-about .about-numbers__label {
  font-size: 13px;
  line-height: 1.55;
  color: var(--mist);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 12px;
  padding-left: 26px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--grass), var(--amber) 55%, var(--line));
}

.page-about .about-node {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--ink-800);
  transition: border-color .22s ease;
}

.page-about .about-node:hover,
.page-about .about-node[open] {
  border-color: var(--grass-line);
}

.page-about .about-node__summary {
  position: relative;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 14px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-node__summary::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 50%;
  margin-top: -5px;
  width: 10px;
  height: 10px;
  box-sizing: border-box;
  border-radius: 50%;
  border: 2px solid var(--grass);
  background: var(--ink-900);
}

.page-about .about-node[open] .about-node__summary::before {
  background: var(--grass);
}

.page-about .about-node__era {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--grass);
}

.page-about .about-node__name {
  flex: 1 1 auto;
  font-family: var(--font-title);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--frost);
}

.page-about .about-node__mark {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-left: auto;
  border-right: 1.5px solid var(--mist);
  border-bottom: 1.5px solid var(--mist);
  transform: rotate(45deg);
  transition: transform .22s ease, border-color .22s ease;
}

.page-about .about-node[open] .about-node__mark {
  transform: rotate(225deg);
  border-color: var(--grass);
}

.page-about .about-node__body {
  padding: 16px 20px 20px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-node__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-node__body p + p {
  margin-top: 12px;
}

.page-about .about-node[open] .about-node__body {
  animation: about-node-in .24s ease both;
}

@keyframes about-node-in {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: none; }
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco__grid {
  display: grid;
  gap: 16px;
}

.page-about .about-eco__item {
  padding: 24px 22px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--grass);
  border-radius: var(--r-sm) var(--r-md) var(--r-md) var(--r-sm);
  background: var(--ink-800);
  transition: border-color .22s ease, transform .22s ease;
}

.page-about .about-eco__item:hover {
  border-color: var(--grass-line);
  transform: translateY(-2px);
}

.page-about .about-eco__item h3 {
  margin: 0 0 10px;
  font-family: var(--font-title);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--frost);
}

.page-about .about-eco__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-honors {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}

.page-about .about-honor {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  border: 1px dashed var(--line);
  border-radius: var(--r-md);
  background: var(--ink-950);
}

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

/* ---------- 联系与支持 ---------- */
.page-about .about-contact {
  display: grid;
  gap: 28px;
  padding: 30px 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  background: linear-gradient(150deg, var(--ink-800) 0%, var(--ink-950) 78%);
}

.page-about .about-contact__lead p {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.82;
  color: var(--mist);
}

.page-about .about-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

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

.page-about .about-contact__list li {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: rgba(7, 26, 20, .72);
}

.page-about .about-contact__key {
  display: block;
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
}

.page-about .about-contact__val {
  display: block;
  font-size: 15px;
  line-height: 1.6;
  color: var(--frost);
  word-break: break-word;
}

.page-about .about-contact__val.num {
  font-family: var(--font-mono);
  letter-spacing: .01em;
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about {
    --about-gutter: 26px;
  }

  .page-about .about-groups {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-honors {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .breadcrumb {
    padding-top: 28px;
  }

  .page-about .about-hero {
    padding: 44px 0 68px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 1fr);
    align-items: start;
    gap: 56px;
  }

  .page-about .about-hero__lede {
    font-size: 17px;
  }

  .page-about .about-block {
    padding: 76px 0;
  }

  .page-about .about-block .section-head {
    margin-bottom: 34px;
  }

  .page-about .about-origin__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 40px 36px;
    align-items: start;
  }

  .page-about .about-origin__body {
    grid-column: 1 / 7;
  }

  .page-about .about-origin__figure {
    grid-column: 8 / 13;
    margin-top: 46px;
  }

  .page-about .about-rhythm {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: center;
    gap: 46px;
    margin-top: 48px;
  }

  .page-about .about-venue__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 52px;
    align-items: center;
  }

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

  .page-about .about-eco__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-timeline {
    max-width: 800px;
    margin-left: auto;
    padding-left: 34px;
  }

  .page-about .about-timeline::before {
    left: 10px;
  }

  .page-about .about-node__summary::before {
    left: -30px;
  }

  .page-about .about-contact {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 48px;
    align-items: start;
    padding: 46px 42px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__side {
    display: block;
    position: absolute;
    right: 14px;
    top: 104px;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: .34em;
    color: var(--mist);
    opacity: .55;
  }
}

/* ---------- 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-group,
  .page-about .about-eco__item,
  .page-about .about-node__mark,
  .page-about .breadcrumb a {
    transition: none;
  }

  .page-about .about-node[open] .about-node__body {
    animation: none;
  }
}