.page-about {
  position: relative;
  background: var(--c-paper);
  overflow: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about__crumb-wrap {
  padding: 24px 0 0;
}

.page-about__crumbs ul {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  padding: 0;
  margin: 0;
  font-family: var(--f-mono);
  font-size: 13px;
  color: var(--c-muted);
}

.page-about__crumbs li + li::before {
  content: '/';
  margin-right: 8px;
  color: var(--c-cyan);
}

.page-about__crumbs a {
  color: var(--c-muted);
  text-decoration: none;
  transition: color 0.22s ease;
}

.page-about__crumbs a:hover {
  color: var(--c-orange);
}

/* ---------- 头部 ---------- */
.page-about__head {
  position: relative;
  padding: 48px 0 112px;
  background: linear-gradient(150deg, var(--c-deep) 0%, var(--c-ocean) 72%, var(--c-ink) 100%);
  color: var(--c-paper);
  overflow: hidden;
}

.page-about__head-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 32px;
}

.page-about__head-index {
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--f-mono);
  font-size: 13px;
  color: rgba(244, 249, 255, 0.75);
}

.page-about__head-no {
  font-size: 44px;
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 2px var(--c-orange);
}

.page-about__head-tag {
  padding: 6px 12px;
  border: 2px solid rgba(57, 255, 136, 0.45);
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about__title-main {
  display: block;
  font-family: var(--f-head);
  font-size: clamp(44px, 8vw, 88px);
  line-height: 0.95;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.page-about__title-sub {
  display: block;
  font-family: var(--f-body);
  font-weight: 800;
  font-size: clamp(20px, 3vw, 30px);
  line-height: 1.25;
  color: var(--c-green);
}

.page-about__lead {
  max-width: 640px;
  font-size: 17px;
  line-height: 1.75;
  color: rgba(244, 249, 255, 0.85);
  border-left: 4px solid var(--c-orange);
  padding-left: 18px;
  margin: 0;
}

.page-about__head-deco {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 140px;
  z-index: 0;
  pointer-events: none;
}

.page-about__head-wave {
  width: 100%;
  height: 100%;
  display: block;
}

/* ---------- 章节通用 ---------- */
.page-about__chapter {
  position: relative;
  padding: 64px 0;
}

.page-about__chapter--origin,
.page-about__chapter--data,
.page-about__chapter--milestone {
  background-color: var(--c-paper);
  background-image:
    linear-gradient(rgba(11, 29, 58, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(11, 29, 58, 0.035) 1px, transparent 1px);
  background-size: 48px 48px;
}

.page-about__chapter--calendar {
  background:
    radial-gradient(circle at 88% 16%, rgba(57, 255, 136, 0.1) 0%, transparent 42%),
    linear-gradient(135deg, var(--c-deep) 0%, var(--c-ocean) 100%);
  color: var(--c-paper);
}

.page-about__chapter--shandong {
  background:
    radial-gradient(circle at 92% 28%, rgba(0, 194, 209, 0.16) 0%, transparent 40%),
    radial-gradient(circle at 16% 82%, rgba(57, 255, 136, 0.1) 0%, transparent 36%),
    linear-gradient(135deg, var(--c-deep) 0%, var(--c-ink) 100%);
  color: var(--c-paper);
}

.page-about__grid {
  display: grid;
  gap: 28px;
}

.page-about__side {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 16px;
  padding-bottom: 16px;
  border-bottom: 2px solid rgba(90, 107, 123, 0.35);
  font-family: var(--f-mono);
}

.page-about__side-no {
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--c-deep);
}

.page-about__chapter--calendar .page-about__side-no,
.page-about__chapter--shandong .page-about__side-no {
  -webkit-text-stroke: 1.5px var(--c-orange);
}

.page-about__side-label {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-muted);
  text-transform: uppercase;
}

.page-about__chapter--calendar .page-about__side-label,
.page-about__chapter--shandong .page-about__side-label {
  color: rgba(244, 249, 255, 0.62);
}

.page-about__side-link {
  margin-left: auto;
  font-size: 13px;
  text-decoration: none;
  color: var(--c-cyan);
  border: 2px solid var(--c-cyan);
  padding: 4px 10px;
  border-radius: 2px;
  transition: background 0.2s ease, color 0.2s ease;
}

.page-about__side-link:hover {
  background: var(--c-cyan);
  color: var(--c-deep);
}

.page-about__chapter--calendar .page-about__side-link,
.page-about__chapter--shandong .page-about__side-link {
  color: var(--c-green);
  border-color: var(--c-green);
}

.page-about__chapter--calendar .page-about__side-link:hover,
.page-about__chapter--shandong .page-about__side-link:hover {
  background: var(--c-green);
  color: var(--c-deep);
}

/* ---------- 正文 ---------- */
.page-about__body-head {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.page-about__body h2 {
  font-family: var(--f-head);
  font-size: clamp(30px, 4.5vw, 52px);
  line-height: 1.05;
  color: var(--c-deep);
  margin: 0;
}

.page-about__chapter--calendar h2,
.page-about__chapter--shandong h2 {
  color: var(--c-paper);
}

.page-about__body-lead {
  font-size: 19px;
  line-height: 1.7;
  font-weight: 700;
  color: var(--c-content);
  margin-bottom: 18px;
}

.page-about__chapter--calendar .page-about__body-lead,
.page-about__chapter--shandong .page-about__body-lead {
  color: var(--c-green);
}

.page-about__body p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-content);
  margin-bottom: 16px;
}

.page-about__chapter--calendar .page-about__body p,
.page-about__chapter--shandong .page-about__body p {
  color: rgba(244, 249, 255, 0.85);
}

/* ---------- 图注 ---------- */
.page-about__figure {
  margin: 28px 0 0;
  padding: 10px 10px 0 0;
  border-right: 3px solid var(--c-orange);
  border-bottom: 3px solid var(--c-orange);
  background: var(--c-paper);
  box-shadow: 8px 8px 0 var(--c-deep);
}

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

.page-about__figure figcaption {
  font-size: 13px;
  color: var(--c-muted);
  padding: 10px 4px 8px;
}

.page-about__figure--data {
  max-width: 460px;
  margin-left: auto;
  margin-right: 0;
  border-right-color: var(--c-cyan);
  box-shadow: 8px 8px 0 var(--c-cyan);
}

.page-about__figure--sd {
  border-right-color: var(--c-green);
  box-shadow: 8px 8px 0 var(--c-green);
}

/* ---------- 赛事日历示例卡 ---------- */
.page-about__calendar-card {
  display: grid;
  gap: 14px;
  margin-top: 28px;
  padding: 18px;
  background: rgba(11, 29, 58, 0.4);
  border: 3px solid rgba(255, 107, 44, 0.55);
  border-radius: var(--radius);
}

.page-about__calendar-col {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about__calendar-title {
  font-size: 12px;
  letter-spacing: 0.15em;
  font-weight: 700;
  color: var(--c-orange);
  padding-bottom: 6px;
  border-bottom: 1px dashed rgba(255, 107, 44, 0.45);
}

.page-about__calendar-item {
  font-size: 14px;
  line-height: 1.5;
  color: var(--c-paper);
  background: rgba(0, 194, 209, 0.1);
  padding: 8px 10px;
  border-left: 3px solid var(--c-cyan);
}

/* ---------- 数据统计 ---------- */
.page-about__stats {
  display: grid;
  gap: 16px;
  margin: 28px 0 20px;
  grid-template-columns: repeat(3, 1fr);
}

.page-about__stat {
  padding: 20px 10px;
  border: 3px solid var(--c-deep);
  border-radius: var(--radius);
  background: var(--c-paper);
  box-shadow: 5px 5px 0 var(--c-deep);
  text-align: center;
}

.page-about__stat-num {
  display: block;
  font-family: var(--f-mono);
  font-size: clamp(26px, 3vw, 40px);
  font-weight: 800;
  color: var(--c-orange);
  line-height: 1.1;
}

.page-about__stat-label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  color: var(--c-muted);
  letter-spacing: 0.12em;
}

/* ---------- 联系说明 ---------- */
.page-about__contact-note {
  margin-top: 28px;
  padding: 16px 18px;
  background: rgba(0, 194, 209, 0.12);
  border-left: 4px solid var(--c-cyan);
  font-size: 15px;
  line-height: 1.6;
  color: var(--c-paper);
}

/* ---------- 时间线 ---------- */
.page-about__timeline {
  margin-top: 36px;
  display: grid;
  gap: 0;
}

.page-about__mile {
  position: relative;
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 18px;
  padding: 0 0 32px;
}

.page-about__mile::after {
  content: '';
  position: absolute;
  left: 30px;
  top: 62px;
  bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--c-orange) 0%, var(--c-cyan) 70%, transparent 100%);
}

.page-about__mile:last-child::after {
  display: none;
}

.page-about__mile-no {
  position: relative;
  z-index: 1;
  font-family: var(--f-mono);
  font-size: 20px;
  font-weight: 800;
  color: var(--c-deep);
  background: var(--c-paper);
  border: 3px solid var(--c-deep);
  border-radius: 50%;
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 4px 4px 0 var(--c-orange);
  line-height: 1;
}

.page-about__mile:last-child .page-about__mile-no {
  background: var(--c-orange);
  color: var(--c-deep);
  box-shadow: 4px 4px 0 var(--c-green);
}

.page-about__mile-body h3 {
  font-family: var(--f-head);
  font-size: 22px;
  color: var(--c-deep);
  margin: 0 0 8px;
}

.page-about__mile-body p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-content);
  margin: 0;
}

/* ---------- 结尾CTA ---------- */
.page-about__outro {
  background: var(--c-ink);
  color: var(--c-paper);
  padding: 56px 0;
}

.page-about__outro-inner {
  max-width: 760px;
}

.page-about__outro-index {
  font-size: 13px;
  color: var(--c-cyan);
  letter-spacing: 0.2em;
  margin-bottom: 14px;
  font-family: var(--f-mono);
}

.page-about__outro-title {
  font-family: var(--f-head);
  font-size: clamp(28px, 4vw, 44px);
  color: var(--c-paper);
  margin: 0 0 12px;
}

.page-about__outro-text {
  font-size: 16px;
  line-height: 1.7;
  color: rgba(244, 249, 255, 0.75);
  margin-bottom: 24px;
}

.page-about__outro-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 桌面断点 ---------- */
@media (min-width: 768px) {
  .page-about__head {
    padding: 64px 0 128px;
  }

  .page-about__head-inner {
    grid-template-columns: 260px 1fr;
    gap: 44px;
  }

  .page-about__head-index {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .page-about__head-no {
    font-size: 68px;
  }

  .page-about__title-main {
    font-size: clamp(56px, 8vw, 96px);
  }

  .page-about__lead {
    font-size: 18px;
  }

  .page-about__chapter {
    padding: 84px 0;
  }

  .page-about__grid {
    grid-template-columns: 220px 1fr;
    gap: 52px;
  }

  .page-about__side {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding-bottom: 0;
    border-bottom: none;
    align-self: start;
    position: sticky;
    top: 108px;
  }

  .page-about__side-no {
    font-size: 52px;
    -webkit-text-stroke-width: 2px;
  }

  .page-about__side-link {
    margin-left: 0;
  }

  .page-about__calendar-card {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about__stats {
    gap: 20px;
  }

  .page-about__mile {
    grid-template-columns: 80px 1fr;
    gap: 24px;
    padding-bottom: 36px;
  }

  .page-about__mile::after {
    left: 38px;
    top: 70px;
  }

  .page-about__mile-no {
    width: 76px;
    height: 76px;
    font-size: 24px;
  }

  .page-about__figure {
    margin-top: 36px;
  }

  .page-about__outro {
    padding: 72px 0;
  }
}