.page-about {
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* 面包屑 */
.page-about__crumbs {
  max-width: var(--container);
  margin: 0 auto;
  padding: 28px 24px 0;
}

/* 首屏 */
.page-about__hero {
  background: var(--cream);
}
.page-about__hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  max-width: var(--container);
  margin: 0 auto;
}
.page-about__hero-year {
  background: var(--moss);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px 20px 40px;
  position: relative;
  min-height: 240px;
}
.page-about__hero-year::after {
  content: '';
  position: absolute;
  left: 24px;
  right: 24px;
  bottom: 0;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--gold), transparent);
}
.page-about__hero-year-num {
  font-family: var(--font-display);
  font-size: clamp(88px, 26vw, 150px);
  font-style: italic;
  line-height: .92;
  color: var(--gold-soft);
  letter-spacing: 6px;
  transition: transform .28s var(--ease-out), text-shadow .28s var(--ease-out), color .28s var(--ease-out);
}
.page-about__hero-year:hover .page-about__hero-year-num,
.page-about__hero-year:focus-within .page-about__hero-year-num {
  color: var(--gold);
  transform: rotate(-2deg) scale(1.03);
  text-shadow: 0 0 44px rgba(212, 175, 55, .4);
}
.page-about__hero-year-label {
  color: var(--mist);
  font-size: 13px;
  letter-spacing: .34em;
  margin-top: 14px;
}
.page-about__hero-year-bar {
  width: 36px;
  height: 2px;
  background: var(--gold);
  margin-top: 16px;
  transition: width .3s var(--ease-out);
}
.page-about__hero-year:hover .page-about__hero-year-bar {
  width: 72px;
}
.page-about__hero-copy {
  padding: 40px 20px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  border-left: 1px solid var(--gold);
}
.page-about__hero-copy h1 {
  font-family: var(--font-display);
  font-size: clamp(30px, 6vw, 46px);
  font-style: italic;
  line-height: 1.12;
  color: var(--moss);
  margin: 0 0 20px;
}
.page-about__hero-copy .lead {
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink);
  margin: 0 0 24px;
}
.page-about__hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about__hero-media {
  position: relative;
  min-height: 300px;
  overflow: hidden;
}
.page-about__hero-media::after {
  content: '';
  position: absolute;
  right: 16px;
  top: 16px;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(212, 175, 55, .55);
  border-left-color: transparent;
  border-bottom-color: transparent;
  z-index: 1;
}
.page-about__hero-img {
  width: 100%;
  height: auto;
  max-width: 100%;
  display: block;
  object-fit: cover;
  min-height: 320px;
}

/* 第一章 从安徽看台开始 */
.page-about__origin {
  padding: 72px 0;
  background: var(--cream);
}
.page-about__origin-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}
.page-about__origin-head .section-heading {
  margin-bottom: 32px;
}
.page-about__notebook {
  width: 140px;
  height: 168px;
  background: #fffdf6;
  border: 1px solid var(--mist);
  border-left: 3px solid var(--gold);
  box-shadow: 12px 14px 0 rgba(12, 59, 46, .09);
  padding: 20px 16px;
  margin: 0 auto 20px;
  position: relative;
  transform: rotate(-2deg);
}
.page-about__notebook-ring {
  width: 18px;
  height: 18px;
  border: 2px solid var(--gold);
  border-radius: 50%;
  position: absolute;
  left: -11px;
  top: 22px;
  background: var(--cream);
}
.page-about__notebook-lines {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 8px;
}
.page-about__notebook-lines span {
  display: block;
  height: 4px;
  background: repeating-linear-gradient(90deg, var(--mist) 0 2px, transparent 2px 6px);
  opacity: .7;
}
.page-about__notebook-stamp {
  position: absolute;
  right: 8px;
  bottom: 8px;
  font-size: 9px;
  letter-spacing: .2em;
  color: var(--clay);
  border: 1px solid var(--clay);
  padding: 2px 5px;
  opacity: .6;
  transform: rotate(-8deg);
}
.page-about__origin-p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
  margin-bottom: 16px;
}
.page-about__origin-cards {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 28px;
}

/* 第二章 八年数据 */
.page-about__data-section {
  background: var(--moss);
  color: var(--cream);
  padding: 72px 0;
}
.page-about__data-section .section-heading__index {
  color: var(--gold);
}
.page-about__data-section .section-heading__title {
  color: var(--cream);
}
.page-about__data-lead {
  font-size: 19px;
  color: var(--mist);
  line-height: 1.7;
  margin: 32px 0;
}
.page-about__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 48px;
}
.page-about__stat {
  border: 1px solid rgba(212, 175, 55, .28);
  background: rgba(10, 20, 16, .45);
  padding: 28px 24px;
}
.page-about__stat-num {
  display: block;
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(40px, 7vw, 64px);
  color: var(--gold);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.page-about__stat-unit {
  display: block;
  font-size: 15px;
  color: var(--mist);
  margin-top: 8px;
  letter-spacing: .04em;
}
.page-about__stat-desc {
  display: block;
  font-size: 12px;
  color: rgba(244, 239, 230, .72);
  margin-top: 6px;
  line-height: 1.5;
}
.page-about__chart-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
.page-about__chart {
  background: rgba(7, 40, 31, .55);
  border: 1px solid rgba(212, 175, 55, .3);
  padding: 24px 16px 12px;
}
.page-about__chart svg {
  display: block;
  width: 100%;
  height: auto;
}
.page-about__chart-gridline {
  stroke: rgba(244, 239, 230, .18);
  stroke-width: 1;
  stroke-dasharray: 4 4;
}
.page-about__chart-line {
  fill: none;
  stroke: var(--gold);
  stroke-width: 3;
  stroke-linecap: square;
}
.page-about__chart-dot {
  fill: var(--gold);
}
.page-about__chart .page-about__chart-axis-label {
  font-family: var(--font-body);
  font-size: 11px;
  fill: var(--mist);
}
.page-about__chart .page-about__chart-grid-label {
  font-family: var(--font-body);
  font-size: 10px;
  fill: var(--rock);
}
.page-about__chart-note {
  margin-top: 0;
  font-size: 13px;
  color: var(--mist);
  line-height: 1.7;
  border-left: 2px solid var(--gold);
  padding-left: 14px;
  max-width: 68ch;
}
.page-about__data-image-frame {
  margin-top: 40px;
  border: 1px solid rgba(212, 175, 55, .4);
  padding: 8px;
  background: rgba(7, 40, 31, .4);
}
.page-about__data-image-frame img {
  display: block;
  width: 100%;
  height: auto;
}

/* 第三章 三十轮可查 */
.page-about__rounds {
  padding: 72px 0;
  background: var(--cream);
}
.page-about__rounds-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  margin-top: 40px;
}
.page-about__rounds-copy .lead {
  font-size: 19px;
  line-height: 1.7;
  margin-bottom: 16px;
}
.page-about__rounds-copy p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
  margin-bottom: 16px;
}
.page-about__rounds-copy .btn--sm {
  border: 1px solid var(--moss);
  color: var(--moss);
}
.page-about__rounds-details {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* 第四章 同一个入口 */
.page-about__three {
  padding: 72px 0;
  background: var(--moss-deep);
  color: var(--cream);
}
.page-about__three .section-heading__index {
  color: var(--gold);
}
.page-about__three .section-heading__title {
  color: var(--cream);
}
.page-about__three-lead {
  font-size: 19px;
  color: var(--mist);
  max-width: 720px;
  line-height: 1.7;
  margin: 32px 0;
}
.page-about__action-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  align-items: start;
}
.page-about__action-card {
  background: linear-gradient(160deg, rgba(12, 59, 46, .92) 0%, rgba(7, 40, 31, .95) 100%);
  border: 1px solid rgba(212, 175, 55, .25);
  border-top: 3px solid var(--gold);
  padding: 32px 24px;
  position: relative;
}
.page-about__action-num {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 44px;
  line-height: 1;
  color: rgba(212, 175, 55, .35);
  display: block;
  margin-bottom: 20px;
}
.page-about__action-title {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 24px;
  color: var(--cream);
  margin: 0 0 12px;
}
.page-about__action-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
  margin-bottom: 24px;
}
.page-about__action-card .btn--sm {
  border: 1px solid var(--gold);
  color: var(--gold);
  background: transparent;
  padding: 8px 14px;
}

/* 尾部品牌区 */
.page-about__closing {
  padding: 72px 0;
  background: var(--moss);
  color: var(--cream);
}
.page-about__closing-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}
.page-about__closing-copy p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
  margin-bottom: 16px;
}
.page-about__closing-title {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 34px;
  line-height: 1.2;
  color: var(--gold-soft);
  margin-bottom: 20px;
}
.page-about__closing-image img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid rgba(212, 175, 55, .4);
}

/* 900px 以上：平板与桌面 */
@media (min-width: 900px) {
  .page-about__hero-grid {
    grid-template-columns: 340px minmax(0, 1fr) 400px;
    min-height: 680px;
  }
  .page-about__hero-year {
    min-height: 680px;
    padding: 60px 32px;
  }
  .page-about__hero-year-label {
    writing-mode: vertical-rl;
    letter-spacing: .5em;
    margin-top: 0;
  }
  .page-about__hero-copy {
    padding: 64px 48px;
  }
  .page-about__hero-media {
    min-height: 680px;
  }
  .page-about__hero-img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    min-height: 0;
  }
  .page-about__origin-layout {
    grid-template-columns: 1fr 1.2fr;
    gap: 64px;
    align-items: start;
  }
  .page-about__origin-head {
    position: sticky;
    top: 110px;
  }
  .page-about__stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }
  .page-about__chart-wrap {
    grid-template-columns: minmax(0, 1fr) 260px;
    align-items: end;
  }
  .page-about__rounds-layout {
    grid-template-columns: 1fr 1fr;
    gap: 64px;
  }
  .page-about__action-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
  .page-about__action-card:nth-child(2) {
    transform: translateY(28px);
  }
  .page-about__closing-layout {
    grid-template-columns: 1fr 1fr;
    gap: 64px;
  }
}