.page-about {
  --about-body: #BFD2CA;
  --about-line: rgba(31, 107, 81, 0.5);
  --about-rail: 208px;
  --about-gap: 44px;
  background:
    radial-gradient(115% 55% at 84% -6%, rgba(25, 240, 200, 0.13), transparent 62%),
    linear-gradient(180deg, var(--ink) 0%, var(--field) 46%, var(--ink) 100%);
  padding-bottom: 76px;
}

/* ---------- 首屏 ---------- */
.page-about .breadcrumb {
  margin: 26px 0 0;
}

.page-about .about-hero {
  padding: 22px 0 34px;
}

.page-about .about-hero .eyebrow {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(30px, 5.6vw, 60px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 20ch;
  margin: 0 0 20px;
}

.page-about .about-lede {
  max-width: 58ch;
  margin: 0 0 26px;
  font-size: 17px;
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 16px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 30px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-facts li {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.page-about .about-facts b {
  font-weight: 700;
  color: var(--orange);
  margin-right: 6px;
}

/* ---------- 骨架：左索引 + 右阅读流 ---------- */
.page-about .about-shell {
  margin-top: 26px;
  min-width: 0;
}

.page-about .about-rail {
  margin-bottom: 20px;
  min-width: 0;
}

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

.page-about .about-rail-list li {
  flex: 0 0 auto;
}

.page-about .about-rail-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border-left: 3px solid transparent;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 14px;
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color 160ms var(--ease), background-color 160ms var(--ease),
    border-color 160ms var(--ease);
}

.page-about .about-rail-link .mono {
  font-size: 12px;
  letter-spacing: 0.06em;
  opacity: 0.75;
}

.page-about .about-rail-link:hover {
  color: var(--paper);
  background: var(--glass);
}

.page-about .about-rail-link.is-active {
  color: var(--paper);
  background: var(--glass-strong);
  border-left-color: var(--cyan);
}

.page-about .about-rail-link.is-active .mono {
  opacity: 1;
}

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 0;
}

/* ---------- 章节面板 ---------- */
.page-about .about-section {
  position: relative;
  padding: 28px 22px 32px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(18, 64, 47, 0.5), rgba(11, 36, 29, 0.84));
  box-shadow: 0 16px 34px rgba(0, 0, 0, 0.3);
  scroll-margin-top: 96px;
  min-width: 0;
}

.page-about .about-section--paper {
  background: var(--paper);
  border-color: rgba(10, 21, 18, 0.1);
  box-shadow: 0 20px 44px rgba(0, 0, 0, 0.38);
}

.page-about .about-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about .about-num {
  flex: 0 0 auto;
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .about-section--paper .about-num {
  color: var(--orange);
}

.page-about .about-title {
  margin: 0;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(21px, 2.3vw, 30px);
  line-height: 1.32;
  color: var(--paper);
}

.page-about .about-section--paper .about-title {
  color: var(--char);
}

.page-about .about-text {
  max-width: 62ch;
  margin: 0 0 14px;
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--about-body);
}

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

.page-about .about-section--paper .about-text {
  color: var(--muted-ink);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 22px 0 0;
  padding: 0 0 0 4px;
  border-left: 1px solid var(--about-line);
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 22px 22px;
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -4.5px;
  top: 6px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--line);
  transition: background-color 160ms var(--ease), box-shadow 160ms var(--ease),
    transform 160ms var(--ease);
}

.page-about .tl-item:hover::before {
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(25, 240, 200, 0.18);
  transform: scale(1.25);
}

.page-about .tl-year {
  display: block;
  margin-bottom: 3px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .tl-title {
  margin: 0 0 4px;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 17px;
  color: var(--paper);
}

.page-about .tl-text {
  max-width: 58ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-body);
  opacity: 0.76;
  transition: opacity 160ms var(--ease);
}

.page-about .tl-item:hover .tl-text {
  opacity: 1;
}

/* ---------- 区域清单与类别标签 ---------- */
.page-about .region-grid {
  list-style: none;
  margin: 20px 0 4px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
}

.page-about .region-item {
  display: flex;
  align-items: center;
  padding: 10px 12px;
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius) var(--radius) 0;
  background: rgba(10, 21, 18, 0.045);
  font-size: 15px;
  color: var(--char);
  transition: background-color 160ms var(--ease), border-color 160ms var(--ease),
    transform 160ms var(--ease);
}

.page-about .region-item:hover {
  background: rgba(25, 240, 200, 0.2);
  border-left-color: var(--line);
  transform: translateX(3px);
}

.page-about .sport-tags {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .sport-tags .tag {
  padding: 6px 13px;
  border-radius: 999px;
  font-size: 14px;
  background: rgba(18, 64, 47, 0.08);
  border: 1px solid rgba(18, 64, 47, 0.22);
  color: var(--turf);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 22px 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--about-line);
  background: linear-gradient(135deg, var(--field), var(--turf));
}

.page-about .about-section--paper .about-figure {
  border-color: rgba(10, 21, 18, 0.12);
}

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

/* ---------- 规模数字 ---------- */
.page-about .stat-strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 22px 0 18px;
}

.page-about .stat-item {
  padding: 16px 16px 14px;
  border-top: 2px solid var(--cyan);
  border-radius: 0 0 var(--radius) var(--radius);
  background: rgba(25, 240, 200, 0.05);
}

.page-about .stat-num {
  display: block;
  font-size: clamp(26px, 3.8vw, 38px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--orange);
}

.page-about .stat-label {
  display: block;
  margin-top: 6px;
  font-size: 14px;
  color: var(--about-body);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-top: 20px;
}

.page-about .team-card {
  padding: 18px 18px 20px;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(10, 21, 18, 0.1);
  background: rgba(10, 21, 18, 0.04);
  transition: transform 160ms var(--ease), box-shadow 160ms var(--ease),
    border-color 160ms var(--ease);
}

.page-about .team-card:hover {
  transform: translateY(-4px);
  border-color: var(--turf);
  box-shadow: 0 14px 28px rgba(10, 21, 18, 0.16);
}

.page-about .team-count {
  display: block;
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--turf);
}

.page-about .team-name {
  margin: 10px 0 6px;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 16.5px;
  color: var(--char);
}

.page-about .team-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted-ink);
}

/* ---------- 版本节奏 ---------- */
.page-about .cadence {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .cadence-item {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  align-items: baseline;
  padding: 15px 18px;
  border-left: 3px solid var(--line);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: rgba(25, 240, 200, 0.05);
  transition: background-color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .cadence-item:hover {
  background: var(--glass-strong);
  border-left-color: var(--orange);
}

.page-about .cadence-key {
  flex: 0 0 auto;
  min-width: 74px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--orange-soft);
}

.page-about .cadence-body {
  flex: 1 1 240px;
  min-width: 0;
}

.page-about .cadence-title {
  margin: 0 0 3px;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 16px;
  color: var(--paper);
}

.page-about .cadence-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--about-body);
}

/* ---------- 联系方式 ---------- */
.page-about .contact-list {
  list-style: none;
  margin: 20px 0 18px;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .contact-item {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  align-items: baseline;
  padding: 12px 14px;
  border-left: 3px solid rgba(18, 64, 47, 0.35);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: rgba(18, 64, 47, 0.05);
  transition: border-color 160ms var(--ease), background-color 160ms var(--ease);
}

.page-about .contact-item:hover {
  border-left-color: var(--turf);
  background: rgba(18, 64, 47, 0.09);
}

.page-about .contact-key {
  flex: 0 0 auto;
  min-width: 76px;
  font-size: 14px;
  color: var(--muted-ink);
}

.page-about .contact-val {
  flex: 1 1 220px;
  min-width: 0;
  font-size: 15px;
  color: var(--char);
  word-break: break-word;
}

.page-about .contact-val.mono {
  font-size: 14.5px;
  letter-spacing: 0.01em;
}

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about .about-section--paper .btn-ghost {
  color: var(--turf);
  border-color: rgba(18, 64, 47, 0.42);
}

.page-about .about-section--paper .btn-ghost:hover {
  background: rgba(18, 64, 47, 0.08);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-section {
    padding: 34px 34px 38px;
  }

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

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

@media (min-width: 900px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 980px) {
  .page-about .about-shell {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    margin-bottom: 0;
    align-self: start;
  }

  .page-about .about-rail-list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail-link {
    white-space: normal;
    padding: 9px 12px;
  }

  .page-about .about-hero {
    padding: 30px 0 40px;
  }

  .page-about .about-section {
    padding: 40px 44px 46px;
  }

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

@media (min-width: 1200px) {
  .page-about .about-section {
    padding: 46px 54px 52px;
  }

  .page-about .about-figure {
    margin-top: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .region-item:hover,
  .page-about .team-card:hover,
  .page-about .tl-item:hover::before {
    transform: none;
  }
}