.page-about {
  display: block;
  padding-bottom: 72px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 40px 0 44px;
  background:
    linear-gradient(180deg, rgba(11, 26, 43, .2), rgba(11, 26, 43, .92)),
    repeating-linear-gradient(0deg, rgba(53, 224, 214, .045) 0 1px, transparent 1px 5px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -240px;
  right: -200px;
  width: 640px;
  height: 640px;
  background: radial-gradient(circle, rgba(53, 224, 214, .16), transparent 66%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -120px;
  bottom: -220px;
  width: 520px;
  height: 520px;
  background: radial-gradient(circle, rgba(242, 160, 61, .1), transparent 68%);
  pointer-events: none;
}

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

.page-about .breadcrumb-list {
  list-style: none;
  margin: 0 0 30px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--mist);
}

.page-about .breadcrumb-list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-about .breadcrumb-list a {
  color: var(--mist);
  text-decoration: none;
  transition: color .22s var(--ease);
}

.page-about .breadcrumb-list a:hover { color: var(--cyan); }

.page-about .breadcrumb-list span[aria-current="page"] { color: var(--paper); }

.page-about .about-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6vw, 68px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--paper);
  margin: 14px 0 22px;
  max-width: 900px;
}

.page-about .about-lede {
  font-family: var(--font-mono);
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--mist);
  max-width: 760px;
  margin: 0 0 34px;
}

.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 20px;
}

.page-about .about-stat {
  border-top: 2px solid var(--brass);
  padding-top: 12px;
  min-width: 0;
}

.page-about .about-stat-value {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 4.4vw, 36px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--amber);
}

.page-about .about-stat-label {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--mist);
}

/* ---------- 布局骨架 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 28px;
  margin-top: 12px;
  min-width: 0;
}

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

/* ---------- 左侧章节轴 ---------- */
.page-about .chapter-rail {
  min-width: 0;
  font-family: var(--font-mono);
}

.page-about .rail-title {
  margin: 0 0 10px;
  font-size: 11.5px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--brass);
}

.page-about .chapter-rail-list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .chapter-rail-list::-webkit-scrollbar { display: none; }

.page-about .chapter-rail-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: rgba(18, 40, 63, .5);
  color: var(--mist);
  text-decoration: none;
  font-size: 12.5px;
  white-space: nowrap;
  transition: color .22s var(--ease), border-color .22s var(--ease), background .22s var(--ease);
}

.page-about .chapter-rail-num {
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--brass);
  transition: color .22s var(--ease);
}

.page-about .chapter-rail-link:hover {
  color: var(--paper);
  border-color: var(--cyan);
}

.page-about .chapter-rail-link.is-current {
  color: var(--paper);
  border-color: var(--amber);
  background: rgba(242, 160, 61, .14);
}

.page-about .chapter-rail-link.is-current .chapter-rail-num { color: var(--amber); }

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  --ch-accent: var(--cyan);
  position: relative;
  padding: 44px 0 54px;
  scroll-margin-top: 112px;
  min-width: 0;
}

.page-about .about-chapter::before {
  content: "";
  display: block;
  width: 52px;
  height: 3px;
  border-radius: 2px;
  background: var(--ch-accent);
  margin-bottom: 20px;
}

.page-about .about-chapter + .about-chapter {
  border-top: 1px solid rgba(35, 64, 92, .55);
}

.page-about #ch-night { --ch-accent: var(--amber); }
.page-about #ch-venue { --ch-accent: var(--cyan); }
.page-about #ch-archive { --ch-accent: var(--wine); }
.page-about #ch-evolution { --ch-accent: var(--indigo); }
.page-about #ch-team { --ch-accent: var(--amber); }
.page-about #ch-partners { --ch-accent: var(--cyan); }

.page-about .about-chapter-head {
  display: grid;
  gap: 8px;
  margin-bottom: 28px;
}

.page-about .about-chapter .section-index {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--ch-accent);
}

.page-about .about-chapter .section-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 3.6vw, 40px);
  line-height: 1.2;
  letter-spacing: -.015em;
  color: var(--paper);
  margin: 0;
}

.page-about .about-lead {
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist);
  max-width: 660px;
  margin: 0 0 26px;
}

.page-about .about-note {
  margin: 26px 0 0;
  padding: 16px 18px;
  border-left: 3px solid var(--cyan);
  background: rgba(53, 224, 214, .06);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 图文错位 ---------- */
.page-about .about-split {
  display: grid;
  gap: 26px;
  min-width: 0;
}

.page-about .about-text {
  min-width: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.9;
  color: var(--paper);
}

.page-about .about-text p { margin: 0 0 16px; }

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

.page-about .about-points {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-points li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--amber);
}

.page-about .about-points strong {
  display: inline-block;
  margin-right: 8px;
  color: var(--paper);
  font-weight: 700;
}

.page-about .about-figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-figure .img-frame { margin: 0; }

.page-about .about-figure .img-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

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

.page-about .about-figure--band { margin-top: 34px; }

.page-about .about-figure--plain {
  align-self: start;
}

/* ---------- 档案分类标签 ---------- */
.page-about .about-tags {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------- 场地平面图 ---------- */
.page-about .court-map {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, rgba(18, 40, 63, .78), rgba(11, 26, 43, .94));
  box-shadow: inset 0 1px 0 rgba(53, 224, 214, .1);
}

.page-about .court-map-svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .map-shell {
  fill: none;
  stroke: rgba(35, 64, 92, .95);
  stroke-width: 1.5;
}

.page-about .court rect {
  fill: rgba(53, 224, 214, .07);
  stroke: rgba(53, 224, 214, .42);
  stroke-width: 1.4;
  transition: fill .24s var(--ease), stroke .24s var(--ease);
}

.page-about .court text {
  fill: var(--mist);
  font-family: var(--font-mono);
  font-size: 15px;
  text-anchor: middle;
  pointer-events: none;
  transition: fill .24s var(--ease);
}

.page-about .court:hover rect {
  fill: rgba(242, 160, 61, .2);
  stroke: var(--amber);
}

.page-about .court:hover text { fill: var(--paper); }

.page-about .stand rect {
  fill: rgba(138, 90, 34, .24);
  stroke: rgba(138, 90, 34, .7);
  stroke-width: 1.4;
}

.page-about .stand text {
  fill: var(--amber);
  font-family: var(--font-mono);
  font-size: 14px;
  text-anchor: middle;
  pointer-events: none;
}

/* ---------- 三次重构 ---------- */
.page-about .phase-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .phase {
  position: relative;
  padding: 22px 20px 24px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: rgba(18, 40, 63, .48);
  backdrop-filter: blur(6px);
  transition: border-color .24s var(--ease), transform .24s var(--ease);
}

.page-about .phase::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 0;
  width: 34px;
  height: 3px;
  border-radius: 2px;
  background: var(--indigo);
}

.page-about .phase:hover {
  border-color: rgba(53, 224, 214, .55);
  transform: translateY(-3px);
}

.page-about .phase-num {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--brass);
}

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

.page-about .phase-text {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 16px;
}

.page-about .team-card {
  position: relative;
  padding: 22px 20px 24px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(18, 40, 63, .6), rgba(11, 26, 43, .82));
  min-width: 0;
}

.page-about .team-card::after {
  content: "";
  position: absolute;
  right: 18px;
  top: 18px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.page-about .team-card--ops::after { background: var(--amber); }
.page-about .team-card--edit::after { background: var(--wine); }
.page-about .team-card--tech::after { background: var(--cyan); }

.page-about .team-count {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 34px;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .team-card--ops .team-count { color: var(--amber); }
.page-about .team-card--edit .team-count { color: #C98A9B; }

.page-about .team-title {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--paper);
}

.page-about .team-text {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 合作信息条 ---------- */
.page-about .partner-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .partner-list li {
  display: grid;
  gap: 4px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .partner-key {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--brass);
}

.page-about .partner-val {
  font-family: var(--font-mono);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--paper);
}

/* ---------- 尾部动作 ---------- */
.page-about .about-cta {
  margin-top: 44px;
  padding: 26px 22px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background:
    radial-gradient(circle at 88% 12%, rgba(53, 224, 214, .14), transparent 62%),
    rgba(18, 40, 63, .55);
  display: grid;
  gap: 18px;
}

.page-about .about-cta-text {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-stats { grid-template-columns: repeat(4, minmax(0, 1fr)); }

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

  .page-about .partner-list li {
    grid-template-columns: 140px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    align-items: start;
    gap: 32px;
  }

  .page-about .about-split > .about-text { grid-column: 1 / span 6; }
  .page-about .about-split > .about-figure { grid-column: 8 / span 5; margin-top: 34px; }

  .page-about .about-split--flip > .about-figure { grid-column: 1 / span 6; margin-top: 0; }
  .page-about .about-split--flip > .about-text { grid-column: 8 / span 5; margin-top: 26px; }

  .page-about .about-split > .about-figure--plain { margin-top: 0; }

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

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

@media (min-width: 1040px) {
  .page-about .about-layout {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 60px;
    align-items: start;
  }

  .page-about .chapter-rail {
    position: sticky;
    top: 116px;
    align-self: start;
  }

  .page-about .chapter-rail-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .chapter-rail-link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    margin-left: -1px;
    padding: 13px 0 13px 16px;
    background: transparent;
  }

  .page-about .chapter-rail-link:hover {
    border-color: var(--cyan);
    background: linear-gradient(90deg, rgba(53, 224, 214, .1), transparent);
  }

  .page-about .chapter-rail-link.is-current {
    border-color: var(--amber);
    background: linear-gradient(90deg, rgba(242, 160, 61, .16), transparent);
  }

  .page-about .about-hero { padding: 56px 0 52px; }
  .page-about .about-chapter { padding: 56px 0 68px; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .chapter-rail-link,
  .page-about .court rect,
  .page-about .court text,
  .page-about .phase,
  .page-about .breadcrumb-list a {
    transition: none;
  }

  .page-about .phase:hover { transform: none; }
}