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

/* ---------- 封面带 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding-top: calc(var(--header-h) + clamp(28px, 6vw, 64px));
  padding-bottom: clamp(32px, 5vw, 56px);
  border-bottom: 1px solid var(--grid);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -15%;
  width: min(760px, 92vw);
  height: min(760px, 92vw);
  background: radial-gradient(circle at 50% 50%, rgba(0, 229, 255, 0.13), transparent 68%);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(34, 49, 94, 0.5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(34, 49, 94, 0.5) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.45;
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero__title {
  margin: clamp(16px, 2.6vw, 28px) 0 0;
  max-width: 20ch;
  font-size: clamp(30px, 6vw, 72px);
  line-height: 1.08;
  letter-spacing: -0.01em;
}

.page-about .about-hero__lede {
  max-width: 62ch;
  margin: clamp(18px, 3vw, 28px) 0 0;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-nums {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .hn {
  margin: 0;
  padding: clamp(14px, 2vw, 22px);
  background: var(--ink);
  transition: background var(--t-fast);
}

.page-about .hn:hover {
  background: var(--panel);
}

.page-about .hn-lab {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .hn-val {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

/* ---------- 主体分栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
  padding-top: clamp(32px, 5vw, 56px);
  padding-bottom: clamp(40px, 7vw, 88px);
}

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

/* ---------- 左侧目录 ---------- */
.page-about .rail-title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
}

.page-about .rail-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
}

.page-about .rail-list a .mono {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--volt);
}

.page-about .rail-list a:hover,
.page-about .rail-list a:focus-visible {
  color: var(--text);
  border-bottom-color: var(--volt);
  outline: none;
}

/* ---------- 章节带 ---------- */
.page-about .about-sec {
  padding-block: clamp(36px, 5.5vw, 64px);
  border-top: 1px solid var(--grid);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

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

.page-about .sec-head {
  display: flex;
  align-items: baseline;
  gap: clamp(10px, 1.6vw, 16px);
  margin: 0 0 clamp(16px, 2.6vw, 26px);
}

.page-about .sec-no {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--volt);
}

.page-about .sec-title {
  margin: 0;
  font-size: clamp(21px, 3.2vw, 36px);
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .sec-body {
  max-width: 68ch;
}

.page-about .sec-body p {
  margin: 0 0 1.2em;
  font-size: clamp(15px, 1.6vw, 16.5px);
  line-height: 1.85;
  color: var(--text);
}

.page-about .sec-body p:last-child {
  margin-bottom: 0;
}

/* ---------- 团队分工 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(22px, 3vw, 32px);
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .team-card {
  background: var(--panel);
  padding: clamp(18px, 2.2vw, 26px);
  transition: background var(--t-fast), box-shadow var(--t-fast);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  background: #16234d;
}

.page-about .team-card:focus-visible {
  outline: 2px solid var(--volt);
  outline-offset: -2px;
}

.page-about .team-count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 46px);
  font-weight: 700;
  line-height: 1;
  color: var(--volt);
  font-variant-numeric: tabular-nums;
}

.page-about .team-role {
  margin: 10px 0 8px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .team-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .team-duties {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  max-height: none;
  opacity: 1;
  overflow: hidden;
  transition: max-height 280ms ease, opacity 220ms ease, margin-top 280ms ease;
}

.page-about .team-duties li {
  position: relative;
  padding-left: 14px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .team-duties li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 6px;
  height: 1px;
  background: var(--volt);
}

/* ---------- 图文 ---------- */
.page-about .about-figure {
  margin: clamp(22px, 3vw, 34px) 0;
}

.page-about .about-figure .media {
  margin: 0;
}

.page-about .media--2x1 {
  aspect-ratio: 2 / 1;
}

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

.page-about .media-caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 赛区列表 ---------- */
.page-about .region-list {
  list-style: none;
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .region {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--grid);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--text);
  transition: border-color var(--t-fast), color var(--t-fast);
}

.page-about .region::before {
  content: "";
  flex: none;
  width: 5px;
  height: 5px;
  background: var(--volt);
}

.page-about .region:hover {
  border-color: var(--volt);
  color: var(--volt-soft);
}

/* ---------- 五步路径 ---------- */
.page-about .path-list {
  list-style: none;
  margin: clamp(8px, 1.5vw, 16px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .path-step {
  position: relative;
  background: var(--panel);
  padding: clamp(18px, 2.2vw, 24px);
  transition: background var(--t-fast);
}

.page-about .path-step:hover {
  background: #16234d;
}

.page-about .path-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--volt), rgba(0, 229, 255, 0));
}

.page-about .path-no {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--volt);
}

.page-about .path-name {
  margin: 10px 0 8px;
  font-size: 16px;
  font-weight: 700;
}

.page-about .path-step p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 赛季时间线 ---------- */
.page-about .mile-list {
  list-style: none;
  margin: clamp(8px, 1.5vw, 16px) 0 0;
  padding: 0;
}

.page-about .mile {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: clamp(16px, 2.2vw, 22px) 0 clamp(16px, 2.2vw, 22px) 18px;
  border-top: 1px solid var(--grid);
  border-left: 1px solid var(--grid);
  transition: border-left-color var(--t-fast), background var(--t-fast);
}

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

.page-about .mile:hover {
  border-left-color: var(--volt);
  background: rgba(0, 229, 255, 0.03);
}

.page-about .mile-time {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-about .mile-title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .mile p {
  margin: 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 行内链接组 ---------- */
.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  margin: clamp(20px, 3vw, 30px) 0 0;
}

/* ---------- 站点信息 ---------- */
.page-about .facts {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .fact {
  margin: 0;
  padding: clamp(14px, 1.8vw, 20px) clamp(16px, 2vw, 22px);
  background: var(--panel);
}

.page-about .fact dt {
  margin-bottom: 6px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .fact dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  color: var(--text);
  overflow-wrap: anywhere;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .mile {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

@media (min-width: 760px) {
  .page-about .about-nums {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (hover: hover) and (min-width: 780px) {
  .page-about .team-duties {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
  }

  .page-about .team-card:hover .team-duties,
  .page-about .team-card:focus-within .team-duties {
    max-height: 12rem;
    opacity: 1;
    margin-top: 12px;
  }
}

@media (min-width: 900px) {
  .page-about .path-list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(36px, 4vw, 72px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

  .page-about .rail-list {
    display: block;
    border-left: 1px solid var(--grid);
  }

  .page-about .rail-list li {
    margin-left: -1px;
    border-left: 1px solid transparent;
    transition: border-color var(--t-fast);
  }

  .page-about .rail-list li:hover,
  .page-about .rail-list li:focus-within {
    border-left-color: var(--volt);
  }

  .page-about .rail-list a {
    display: flex;
    padding: 10px 0 10px 14px;
    border-bottom: 0;
  }

  .page-about .rail-list a:hover,
  .page-about .rail-list a:focus-visible {
    color: var(--volt-soft);
    border-bottom-color: transparent;
  }
}