.page-about {
  --about-marker: var(--tqb-accent-primary);
  position: relative;
  background-color: var(--tqb-bg-primary);
  background-image:
    linear-gradient(var(--tqb-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--tqb-grid-line) 1px, transparent 1px);
  background-size: 32px 32px;
}

/* ---------- 通用区块头部 ---------- */
.page-about .about-section-marker {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--tqb-accent-primary);
  margin: 0 0 10px;
  padding: 4px 10px;
  border: 1px solid var(--tqb-border-line);
  border-radius: 999px;
  background: var(--tqb-overlay-glass);
}

.page-about .about-section-title {
  font-family: var(--tqb-font-headline);
  font-size: clamp(24px, 4vw, 32px);
  line-height: 1.2;
  color: var(--tqb-text-primary);
  margin: 0 0 12px;
  font-weight: 900;
}

.page-about .about-section-desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--tqb-text-secondary);
  max-width: 640px;
  margin: 0;
}

.page-about .about-section-header {
  margin-bottom: 32px;
}

/* ---------- 英雄首屏 ---------- */
.page-about .about-hero {
  padding: 40px 0 48px;
  border-bottom: 1px solid var(--tqb-border-line);
  position: relative;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--tqb-accent-primary), transparent);
  opacity: 0.6;
}

.page-about .about-hero-kicker {
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--tqb-accent-primary);
  margin: 0 0 14px;
}

.page-about .about-hero-title {
  font-size: clamp(30px, 6vw, 52px);
  line-height: 1.12;
  color: var(--tqb-text-primary);
  margin: 0 0 20px;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.page-about .about-hero-desc {
  font-size: 16px;
  line-height: 1.8;
  color: var(--tqb-text-secondary);
  max-width: 680px;
  margin: 0 0 26px;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 28px;
}

.page-about .about-issue-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  border-top: 1px solid var(--tqb-border-line);
  padding-top: 18px;
}

.page-about .about-issue-nav a {
  font-size: 12px;
  text-decoration: none;
  color: var(--tqb-text-secondary);
  border: 1px solid var(--tqb-border-line);
  border-radius: var(--tqb-radius);
  padding: 6px 10px;
  transition: color var(--tqb-duration) var(--tqb-ease), border-color var(--tqb-duration) var(--tqb-ease);
}

.page-about .about-issue-nav a span {
  color: var(--tqb-accent-primary);
  margin-right: 4px;
  font-family: var(--tqb-font-data);
}

.page-about .about-issue-nav a:hover,
.page-about .about-issue-nav a:focus {
  color: var(--tqb-text-primary);
  border-color: var(--tqb-accent-primary);
}

.page-about .about-hero-index {
  background: var(--tqb-overlay-glass);
  border: 1px solid var(--tqb-border-line);
  border-radius: var(--tqb-radius);
  padding: 20px;
  margin-top: 28px;
}

.page-about .about-hero-index-title {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--tqb-text-secondary);
  margin: 0 0 16px;
  border-bottom: 1px dashed var(--tqb-border-line);
  padding-bottom: 12px;
}

.page-about .about-hero-index-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px 12px;
  margin: 0;
  padding: 0;
}

.page-about .about-hero-index-list div {
  border-left: 2px solid var(--tqb-accent-primary);
  padding-left: 10px;
}

.page-about .about-hero-index-list dt {
  font-size: 13px;
  color: var(--tqb-text-secondary);
  margin-bottom: 4px;
}

.page-about .about-hero-index-list dd {
  font-family: var(--tqb-font-data);
  font-size: 22px;
  font-weight: 600;
  color: var(--tqb-text-primary);
  margin: 0;
}

.page-about .about-hero-index-list .is-accent {
  border-left-color: var(--tqb-accent-secondary);
}

.page-about .about-hero-index-list .is-accent dd {
  color: var(--tqb-accent-secondary);
}

/* ---------- 品牌使命 ---------- */
.page-about .about-mission {
  padding: 56px 0 48px;
}

.page-about .about-mission-title {
  font-size: var(--tqb-fs-h2);
  line-height: 1.25;
  color: var(--tqb-text-primary);
  font-weight: 900;
  margin: 0 0 16px;
}

.page-about .about-mission .tqb-prose p {
  font-size: 16px;
  line-height: 1.9;
  color: var(--tqb-text-secondary);
  margin: 0 0 16px;
}

/* ---------- 品牌视觉分隔 ---------- */
.page-about .about-brand-block {
  padding: 8px 0 56px;
  text-align: center;
}

.page-about .about-brand-img {
  display: inline-block;
  width: 100%;
  max-width: 400px;
  height: auto;
  border: 1px solid var(--tqb-border-line);
  border-radius: var(--tqb-radius);
  object-fit: cover;
}

/* ---------- 发展里程碑 ---------- */
.page-about .about-milestones {
  padding: 56px 0;
  border-top: 1px solid var(--tqb-border-line);
  border-bottom: 1px solid var(--tqb-border-line);
}

.page-about .about-timeline {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline-item {
  position: relative;
  padding-left: 24px;
  margin-bottom: 36px;
}

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: -30px;
  width: 1px;
  background: var(--tqb-border-line);
}

.page-about .about-timeline-item:last-child::before {
  display: none;
}

.page-about .about-timeline-item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 2px solid var(--tqb-accent-primary);
  background: var(--tqb-bg-primary);
}

.page-about .about-timeline-node {
  margin-bottom: 12px;
}

.page-about .about-timeline-version {
  font-family: var(--tqb-font-data);
  font-size: 14px;
  color: var(--tqb-accent-primary);
  background: var(--tqb-overlay-glass);
  border: 1px solid var(--tqb-border-line);
  border-radius: 999px;
  padding: 4px 12px;
  display: inline-block;
  margin-right: 8px;
}

.page-about .about-timeline-label {
  font-size: 14px;
  color: var(--tqb-text-secondary);
  display: inline-block;
  font-weight: 600;
}

.page-about .about-timeline-body {
  background: var(--tqb-bg-secondary);
  border: 1px solid var(--tqb-border-line);
  border-radius: var(--tqb-radius);
  padding: 16px;
  transition: border-color var(--tqb-duration) var(--tqb-ease), transform var(--tqb-duration) var(--tqb-ease), box-shadow var(--tqb-duration) var(--tqb-ease);
}

.page-about .about-timeline-body:hover,
.page-about .about-timeline-body:focus-within {
  border-color: var(--tqb-accent-primary);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

.page-about .about-timeline-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--tqb-text-secondary);
}

/* ---------- 数据服务能力 ---------- */
.page-about .about-capabilities {
  padding: 56px 0;
  background: linear-gradient(180deg, transparent, var(--tqb-overlay-glass) 25%, var(--tqb-overlay-glass) 75%, transparent);
}

.page-about .about-caps-layout {
  margin-top: 32px;
  display: grid;
  gap: 20px;
}

.page-about .about-caps-main {
  display: grid;
  gap: 16px;
}

.page-about .about-cap-card {
  background: var(--tqb-bg-secondary);
  border: 1px solid var(--tqb-border-line);
  border-radius: var(--tqb-radius);
  padding: 20px;
  transition: border-color var(--tqb-duration) var(--tqb-ease), transform var(--tqb-duration) var(--tqb-ease);
}

.page-about .about-cap-card:hover,
.page-about .about-cap-card:focus-within {
  border-color: var(--tqb-accent-primary);
  transform: translateY(-2px);
}

.page-about .about-cap-card:nth-child(3) {
  border-top: 2px solid var(--tqb-accent-secondary);
}

.page-about .about-cap-card h3 {
  font-size: var(--tqb-fs-h3);
  color: var(--tqb-text-primary);
  font-weight: 900;
  margin: 0 0 10px;
}

.page-about .about-cap-card p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--tqb-text-secondary);
  margin: 0 0 14px;
}

.page-about .about-cap-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-cap-list li {
  font-size: 14px;
  color: var(--tqb-text-secondary);
  border-left: 2px solid var(--tqb-accent-primary);
  padding-left: 10px;
  line-height: 1.5;
}

.page-about .about-cap-figure {
  margin: 0;
  border: 1px solid var(--tqb-border-line);
  border-radius: var(--tqb-radius);
  background: var(--tqb-bg-secondary);
  padding: 8px;
}

.page-about .about-cap-image,
.page-about .about-venue-image {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 2px;
  object-fit: cover;
}

.page-about .about-cap-figure figcaption,
.page-about .about-venue-figure figcaption {
  padding: 10px 6px 4px;
  font-size: 13px;
  color: var(--tqb-text-secondary);
  text-align: center;
}

/* ---------- 场馆信息查询 ---------- */
.page-about .about-venue {
  padding: 56px 0;
}

.page-about .about-venue-layout {
  display: grid;
  gap: 24px;
}

.page-about .about-venue-figure {
  margin: 0;
  border: 1px solid var(--tqb-border-line);
  border-radius: var(--tqb-radius);
  padding: 8px;
  background: var(--tqb-bg-secondary);
}

.page-about .about-venue-desc {
  font-size: 16px;
  line-height: 1.8;
  color: var(--tqb-text-secondary);
  margin: 0 0 20px;
}

/* ---------- 团队与组织 ---------- */
.page-about .about-team {
  padding: 56px 0;
  border-top: 1px solid var(--tqb-border-line);
}

.page-about .about-team-layout {
  margin-top: 32px;
  display: grid;
  gap: 24px;
}

.page-about .about-team-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.page-about .about-stat-box {
  background: var(--tqb-overlay-glass);
  border: 1px solid var(--tqb-border-line);
  border-radius: var(--tqb-radius);
  padding: 18px 14px;
  text-align: center;
  transition: border-color var(--tqb-duration) var(--tqb-ease), transform var(--tqb-duration) var(--tqb-ease);
}

.page-about .about-stat-box:hover {
  border-color: var(--tqb-accent-primary);
  transform: translateY(-2px);
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--tqb-font-data);
  font-size: 26px;
  font-weight: 700;
  color: var(--tqb-accent-primary);
  line-height: 1.2;
}

.page-about .about-stat-caption {
  display: block;
  font-size: 13px;
  color: var(--tqb-text-secondary);
  margin-top: 8px;
  line-height: 1.4;
}

.page-about .about-team-copy p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--tqb-text-secondary);
  margin: 0 0 16px;
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 64px 0 72px;
  }

  .page-about .about-hero-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-hero-index {
    margin-top: 0;
    position: sticky;
    top: 96px;
  }

  .page-about .about-mission {
    padding: 80px 0 64px;
  }

  .page-about .about-mission .tqb-prose p {
    font-size: 17px;
  }

  .page-about .about-brand-block {
    padding: 8px 0 80px;
  }

  .page-about .about-milestones {
    padding: 80px 0;
  }

  .page-about .about-section-header {
    margin-bottom: 40px;
  }

  .page-about .about-timeline {
    margin-top: 40px;
  }

  .page-about .about-timeline-item {
    width: 50%;
    padding-left: 0;
  }

  .page-about .about-timeline-item::before {
    display: none;
  }

  .page-about .about-timeline::before {
    content: "";
    position: absolute;
    left: 50%;
    top: 10px;
    bottom: 10px;
    width: 1px;
    background: var(--tqb-border-line);
    transform: translateX(-1px);
  }

  .page-about .about-timeline-item:nth-child(odd) {
    padding-right: 32px;
    text-align: right;
  }

  .page-about .about-timeline-item:nth-child(even) {
    margin-left: 50%;
    padding-left: 32px;
  }

  .page-about .about-timeline-item::after {
    left: auto;
    right: 0;
    transform: translateX(50%);
  }

  .page-about .about-timeline-item:nth-child(even)::after {
    left: 0;
    right: auto;
    transform: translateX(-50%);
  }

  .page-about .about-timeline-body {
    max-width: 460px;
    margin-right: 28px;
    margin-left: auto;
  }

  .page-about .about-timeline-item:nth-child(even) .about-timeline-body {
    margin-right: auto;
    margin-left: 28px;
  }

  .page-about .about-timeline-node {
    display: flex;
    justify-content: flex-start;
  }

  .page-about .about-timeline-item:nth-child(odd) .about-timeline-node {
    justify-content: flex-end;
  }

  .page-about .about-timeline-version {
    margin-right: 8px;
  }

  .page-about .about-caps-layout {
    grid-template-columns: minmax(0, 1fr) 400px;
    gap: 32px;
    align-items: start;
  }

  .page-about .about-cap-figure {
    position: sticky;
    top: 96px;
  }

  .page-about .about-venue {
    padding: 80px 0;
  }

  .page-about .about-venue-layout {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
  }

  .page-about .about-team {
    padding: 80px 0;
  }

  .page-about .about-team-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 48px;
    align-items: center;
  }

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