.page-about {
  --about-timeline-marker: 14px;
  background: var(--bg-deep);
  color: var(--text-light);
  overflow-x: hidden;
  position: relative;
}

/* ===== 首屏 ===== */
.page-about__hero {
  padding: 48px 0 72px;
  background:
    linear-gradient(135deg, rgba(6, 13, 31, 0.9), rgba(11, 19, 43, 0.72)),
    repeating-linear-gradient(90deg, rgba(248, 249, 250, 0.045) 0 1px, transparent 1px 88px),
    repeating-linear-gradient(0deg, rgba(248, 249, 250, 0.03) 0 1px, transparent 1px 88px);
  border-bottom: 1px solid var(--border-slate);
}
.page-about__hero .container {
  padding-top: 28px;
}
.page-about__eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-gold);
  margin-bottom: 12px;
}
.page-about__hero h1 {
  font-family: var(--font-display);
  font-size: clamp(42px, 10vw, 68px);
  line-height: 0.98;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  margin: 0 0 14px;
}
.page-about__lead {
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--accent-orange);
  margin-bottom: 18px;
}
.page-about__hero-copy > p:last-child {
  color: rgba(248, 249, 250, 0.82);
  line-height: 1.7;
  max-width: 56ch;
  margin: 0;
}
.page-about__hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
  margin-top: 40px;
}
.page-about__hero-panel {
  padding: 20px 22px;
  background: var(--bg-card);
  border: 1px solid var(--border-slate);
  box-shadow: var(--shadow);
}
.page-about__stat-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
}
.page-about__stat-list > div {
  padding: 13px 0;
  border-bottom: 1px dashed var(--border-slate);
}
.page-about__stat-list > div:last-child {
  border-bottom: 0;
}
.page-about__stat-list dt {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-bottom: 4px;
}
.page-about__stat-list dd {
  margin: 0;
  font-family: var(--font-mono);
  color: var(--text-light);
}

/* ===== 品牌故事 ===== */
.page-about__story {
  padding: 64px 0;
  background: linear-gradient(180deg, var(--bg-deeper) 0%, var(--bg-deep) 100%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 32px), 0 100%);
}
.page-about__story-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}
.page-about__story-copy h2,
.page-about__milestones h2,
.page-about__cap-copy h2,
.page-about__membership-copy h2,
.page-about__recognition h2 {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  line-height: 1.1;
  font-weight: 700;
  margin: 0 0 18px;
}
.page-about__story-copy p,
.page-about__cap-copy p,
.page-about__membership-copy p {
  line-height: 1.7;
  color: rgba(248, 249, 250, 0.84);
  margin-bottom: 14px;
}
.page-about__story-frame {
  aspect-ratio: 3 / 2;
  box-shadow: var(--shadow);
}
.page-about__story-frame img,
.page-about__membership-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ===== 里程碑 ===== */
.page-about__milestones {
  padding: 64px 0 80px;
  background: var(--bg-deep);
}
.page-about__milestones-inner {
  max-width: 760px;
  margin: 0 auto;
}
.page-about__section-note {
  margin-bottom: 36px;
  color: var(--text-muted);
  line-height: 1.7;
}
.page-about__timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent-orange), var(--border-slate));
  opacity: 0.6;
}
.page-about__timeline-item {
  position: relative;
  padding-left: 34px;
  margin-bottom: 24px;
}
.page-about__timeline-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  width: var(--about-timeline-marker);
  height: var(--about-timeline-marker);
  border-radius: 50%;
  background: var(--accent-orange);
  border: 3px solid var(--bg-deep);
  box-shadow: 0 0 0 3px rgba(247, 127, 0, 0.25);
}
.page-about__timeline-card {
  background: var(--bg-card);
  border: 1px solid var(--border-slate);
  border-left: 3px solid var(--accent-orange);
  border-radius: 0 12px 12px 0;
  padding: 18px 20px;
}
.page-about__timeline-card summary {
  cursor: pointer;
  color: var(--text-light);
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: 0.02em;
  list-style: none;
  position: relative;
  padding-right: 28px;
}
.page-about__timeline-card summary::-webkit-details-marker {
  display: none;
}
.page-about__timeline-card summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  color: var(--accent-orange);
  font-size: 20px;
  transition: transform var(--transition);
}
.page-about__timeline-card[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}
.page-about__timeline-year {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--accent-gold);
  letter-spacing: 0.1em;
  margin-bottom: 4px;
}
.page-about__timeline-detail {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed var(--border-slate);
}
.page-about__timeline-detail p {
  margin: 0;
  font-size: var(--text-sm);
  color: rgba(248, 249, 250, 0.78);
  line-height: 1.7;
}

/* ===== 数据服务能力 ===== */
.page-about__capability {
  position: relative;
  padding: 72px 0;
  overflow: hidden;
  background: var(--bg-deeper);
}
.page-about__cap-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.page-about__cap-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
}
.page-about__cap-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(6, 13, 31, 0.94) 0%, rgba(11, 19, 43, 0.82) 50%, rgba(6, 13, 31, 0.96) 100%);
}
.page-about__capability .container {
  position: relative;
  z-index: 1;
}
.page-about__cap-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: end;
  margin-bottom: 40px;
}
.page-about__cap-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
.page-about__cap-stat {
  padding: 20px 14px;
  text-align: center;
  background: rgba(17, 28, 54, 0.82);
  backdrop-filter: blur(4px);
  border: 1px solid var(--border-slate);
  box-shadow: var(--shadow);
}
.page-about__cap-stat .data {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  line-height: 1;
  color: var(--accent-orange);
  margin-bottom: 8px;
}
.page-about__cap-stat span:last-child {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

/* ===== 联赛标签页 ===== */
.page-about__league-tabs {
  margin-top: 48px;
  padding: 20px;
  background: rgba(6, 13, 31, 0.66);
  border: 1px solid var(--border-slate);
  box-shadow: var(--shadow);
}
.page-about__league-tabs .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  border-bottom: 1px solid var(--border-slate);
  margin-bottom: 20px;
}
.page-about__league-tabs .tabs__btn {
  appearance: none;
  border: 0;
  background: transparent;
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  padding: 10px 16px;
  cursor: pointer;
  position: relative;
  transition: color var(--transition);
}
.page-about__league-tabs .tabs__btn::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: -1px;
  height: 2px;
  background: var(--accent-orange);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}
.page-about__league-tabs .tabs__btn:hover,
.page-about__league-tabs .tabs__btn:focus-visible {
  color: var(--text-light);
  outline: none;
}
.page-about__league-tabs .tabs__btn[aria-selected="true"] {
  color: var(--text-light);
}
.page-about__league-tabs .tabs__btn[aria-selected="true"]::after {
  transform: scaleX(1);
}
.page-about__league-panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  align-items: center;
}
.page-about__league-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}
.page-about__league-list li {
  background: rgba(11, 19, 43, 0.72);
  border: 1px solid var(--border-slate);
  padding: 10px 12px;
  font-weight: 600;
  font-size: var(--text-base);
  display: flex;
  align-items: center;
  gap: 8px;
}
.page-about__league-list li::before {
  content: "";
  width: 6px;
  height: 6px;
  flex: 0 0 6px;
  background: var(--accent-blue);
  transform: skewX(-18deg);
}
.page-about__league-note {
  margin: 0;
  color: rgba(248, 249, 250, 0.8);
  font-size: var(--text-sm);
  line-height: 1.7;
}

/* ===== 会员体系 ===== */
.page-about__membership {
  padding: 72px 0;
  background: var(--bg-deep);
}
.page-about__membership-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
  margin-bottom: 44px;
}
.page-about__membership-frame {
  aspect-ratio: 16 / 10;
  box-shadow: var(--shadow);
}
.page-about__service-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.page-about__service-card {
  margin: 0;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-slate);
  box-shadow: none;
}
.page-about__service-card p {
  margin: 14px 0 0;
  color: rgba(248, 249, 250, 0.78);
  font-size: var(--text-sm);
  line-height: 1.7;
}

/* ===== 行业认可 ===== */
.page-about__recognition {
  padding: 72px 0;
  background: var(--bg-deep);
  border-top: 1px solid var(--border-slate);
}
.page-about__recognition-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 28px;
}
.page-about__recognition-card {
  background: var(--bg-card);
  border: 1px solid var(--border-slate);
  border-left: 3px solid var(--accent-gold);
  padding: 24px 20px;
}
.page-about__recognition-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  margin: 10px 0 8px;
  color: var(--text-light);
}
.page-about__recognition-card p {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.65;
  color: rgba(248, 249, 250, 0.76);
}
.page-about__recognition-tag {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ===== 继续了解 ===== */
.page-about__cta {
  padding: 0 0 80px;
  background: var(--bg-deeper);
}
.page-about__cta-inner {
  max-width: 860px;
  margin: 0 auto;
  padding: 48px 28px;
  text-align: center;
  border: 1px solid var(--border-slate);
  background: linear-gradient(135deg, rgba(247, 127, 0, 0.16), rgba(28, 119, 255, 0.08));
  box-shadow: var(--shadow);
}
.page-about__cta-inner h2 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  margin: 0 0 12px;
}
.page-about__cta-inner p {
  color: rgba(248, 249, 250, 0.8);
  line-height: 1.7;
  margin: 0 auto 24px;
  max-width: 52ch;
}
.page-about__cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

/* ===== 桌面端增强 ===== */
@media (min-width: 700px) {
  .page-about__service-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about__recognition-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about__league-panel {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 900px) {
  .page-about__hero-grid {
    grid-template-columns: 7fr 5fr;
    margin-top: 56px;
  }
  .page-about__story-grid {
    grid-template-columns: 7fr 5fr;
  }
  .page-about__cap-grid {
    grid-template-columns: 6fr 6fr;
  }
  .page-about__membership-grid {
    grid-template-columns: 1.1fr 0.9fr;
  }
}