.page-about {
  --about-note: #4F5D55;
  --about-rule: rgba(20, 17, 14, .14);
  background: var(--paper);
  color: var(--paper-ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--about-note);
}

.page-about .breadcrumb a {
  color: var(--ink-green);
  text-decoration: none;
  border-bottom: 2px solid transparent;
}

.page-about .breadcrumb a:hover {
  border-bottom-color: var(--neon);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: 24px 0 34px;
  border-bottom: var(--bw) solid var(--paper-ink);
  background: var(--paper);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(0deg, rgba(107, 74, 50, .13) 0 1px, transparent 1px 28px),
    repeating-linear-gradient(90deg, rgba(107, 74, 50, .13) 0 1px, transparent 1px 56px);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .95), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .95), transparent 76%);
}

.page-about .eyebrow {
  color: var(--ink-green);
  margin-top: 26px;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: condensed;
  font-size: clamp(2.5rem, 9.5vw, 5rem);
  line-height: .96;
  letter-spacing: -.01em;
  margin: 14px 0 20px;
  max-width: 15ch;
}

.page-about .about-hero .lede {
  font-size: 1rem;
  line-height: 1.8;
  max-width: 58ch;
  color: var(--paper-ink);
  margin: 0;
}

.page-about .hero-facts {
  list-style: none;
  margin: 30px 0 0;
  padding: 20px 0 0;
  border-top: 1px dashed var(--about-rule);
  display: flex;
  flex-wrap: wrap;
  gap: 18px 32px;
}

.page-about .hero-facts li {
  display: flex;
  align-items: baseline;
  gap: 9px;
}

.page-about .fact-num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1;
  color: var(--ink-green);
  border-bottom: 4px solid var(--neon);
  padding-bottom: 3px;
}

.page-about .fact-label {
  font-size: .82rem;
  line-height: 1.4;
  color: var(--about-note);
  letter-spacing: .03em;
}

/* ---------- 目录 ---------- */

.page-about .about-flow {
  padding-top: 40px;
  padding-bottom: 10px;
}

.page-about .about-toc {
  max-width: 640px;
  margin-bottom: 34px;
}

.page-about .toc-head {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: .74rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--about-note);
}

.page-about .about-toc ol {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--bw) solid var(--paper-ink);
}

.page-about .about-toc a {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 13px 2px;
  border-bottom: 1px solid var(--about-rule);
  color: var(--paper-ink);
  text-decoration: none;
  font-size: .95rem;
  font-weight: 600;
  transition: color .2s var(--ease);
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--ink-green);
}

.page-about .toc-num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: .8rem;
  letter-spacing: .06em;
  color: var(--stand-orange);
  flex: none;
}

/* ---------- 章节 ---------- */

.page-about .chapter {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 34px 0 26px;
  border-top: 1px solid var(--about-rule);
}

.page-about .chapter-num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 2.3rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--paper-ink);
}

.page-about .chapter-num::after {
  content: "";
  display: block;
  width: 44px;
  height: 5px;
  margin-top: 10px;
  background: var(--neon);
  box-shadow: 0 0 0 1px rgba(20, 17, 14, .3);
}

.page-about .chapter-main {
  display: flow-root;
  min-width: 0;
}

.page-about .chapter-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: condensed;
  font-size: clamp(1.65rem, 6vw, 2.6rem);
  line-height: 1.02;
  margin: 10px 0 18px;
  color: var(--paper-ink);
}

.page-about .chapter-body p {
  font-size: 1rem;
  line-height: 1.82;
  margin: 0 0 16px;
  max-width: 62ch;
}

.page-about .chapter-body a {
  color: var(--ink-green);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 2px solid var(--neon);
}

.page-about .chapter-body a:hover {
  border-bottom-color: var(--stand-orange);
}

.page-about .aside-note {
  display: block;
  margin: 20px 0;
  padding: 2px 0 2px 14px;
  border-left: 4px solid var(--stand-orange);
  font-size: .855rem;
  line-height: 1.72;
  color: var(--about-note);
  max-width: 46ch;
}

/* ---------- 年份折叠 ---------- */

.page-about .year-list {
  margin: 24px 0 6px;
  border-top: var(--bw) solid var(--paper-ink);
}

.page-about .year {
  border-bottom: 1px solid var(--about-rule);
}

.page-about .year summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 15px 0;
  cursor: pointer;
  list-style: none;
}

.page-about .year summary::-webkit-details-marker {
  display: none;
}

.page-about .year-num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 1rem;
  color: var(--stand-orange);
  flex: none;
}

.page-about .year-title {
  font-size: .98rem;
  font-weight: 700;
  color: var(--paper-ink);
}

.page-about .year summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-num);
  font-size: 1.1rem;
  color: var(--about-note);
}

.page-about .year[open] summary::after {
  content: "−";
  color: var(--ink-green);
}

.page-about .year[open] .year-title {
  color: var(--ink-green);
}

.page-about .year p {
  margin: 0 0 18px;
  font-size: .93rem;
  line-height: 1.78;
  color: var(--paper-ink);
  max-width: 58ch;
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: 26px 0 8px;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--bw) solid var(--paper-ink);
  box-shadow: var(--hard-sm);
  filter: saturate(.85) contrast(1.05) brightness(.94);
}

.page-about .about-figure--wide img {
  aspect-ratio: 16 / 7;
}

.page-about .about-figure figcaption {
  margin-top: 13px;
  padding-top: 9px;
  border-top: 1px solid var(--about-rule);
  font-size: .78rem;
  letter-spacing: .04em;
  color: var(--about-note);
}

/* ---------- 记分牌章节 ---------- */

.page-about .chapter--board .chapter-main {
  background: var(--ink-green);
  color: var(--lamp);
  border: var(--bw) solid var(--paper-ink);
  box-shadow: var(--hard);
  padding: 24px 20px 28px;
  margin-top: 12px;
}

.page-about .chapter--board .chapter-title {
  color: var(--lamp);
}

.page-about .chapter--board .chapter-body p {
  color: rgba(247, 251, 247, .86);
}

.page-about .chapter--board .chapter-body a {
  color: var(--neon);
  border-bottom-color: rgba(198, 255, 61, .45);
}

.page-about .board {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 20px;
  margin: 26px 0 20px;
  border-top: 1px solid rgba(198, 255, 61, .3);
}

.page-about .board-cell {
  padding: 18px 0 14px;
  border-bottom: 1px solid rgba(143, 167, 155, .22);
}

.page-about .board-num {
  display: block;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2rem, 8vw, 2.7rem);
  font-weight: 700;
  line-height: 1;
  color: var(--neon);
  text-shadow: 0 0 20px rgba(198, 255, 61, .32);
}

.page-about .board-label {
  display: block;
  margin-top: 9px;
  font-size: .76rem;
  line-height: 1.5;
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 收尾 ---------- */

.page-about .about-next {
  margin-top: 40px;
  padding: 44px 0 54px;
  border-top: var(--bw) solid var(--paper-ink);
  background-color: var(--ink-green);
  background-image:
    repeating-linear-gradient(135deg, rgba(107, 74, 50, .18) 0 2px, transparent 2px 15px),
    linear-gradient(170deg, #102A22 0%, #0B0F0E 100%);
  color: var(--lamp);
}

.page-about .about-next h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: condensed;
  font-size: clamp(1.7rem, 6.4vw, 3rem);
  line-height: 1.04;
  margin: 0 0 14px;
  color: var(--lamp);
  max-width: 18ch;
}

.page-about .about-next p {
  margin: 0 0 24px;
  font-size: .98rem;
  line-height: 1.78;
  max-width: 52ch;
  color: rgba(247, 251, 247, .82);
}

.page-about .about-next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-next .btn-ghost {
  color: var(--lamp);
  border-color: rgba(247, 251, 247, .55);
}

.page-about .about-next .btn-ghost:hover {
  border-color: var(--neon);
  color: var(--neon);
}

/* ---------- 宽屏 ---------- */

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 34px 0 52px;
  }

  .page-about .about-hero h1 {
    margin-top: 18px;
  }

  .page-about .about-hero .lede {
    font-size: 1.08rem;
  }

  .page-about .fact-num {
    font-size: 2.1rem;
  }

  .page-about .about-flow {
    padding-top: 56px;
  }

  .page-about .chapter {
    grid-template-columns: 132px minmax(0, 1fr);
    column-gap: 46px;
    padding: 48px 0 36px;
  }

  .page-about .chapter-num {
    font-size: 2.8rem;
  }

  .page-about .chapter-title {
    margin-top: 0;
  }

  .page-about .chapter--board .chapter-main {
    margin-top: 0;
    padding: 34px 34px 36px;
  }

  .page-about .board {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 24px;
  }

  .page-about .aside-note {
    float: right;
    width: 218px;
    margin: 6px 0 18px 34px;
    clear: right;
  }

  .page-about .about-figure {
    margin: 34px 0 12px;
  }

  .page-about .about-next {
    padding: 66px 0 74px;
  }
}

@media (min-width: 1180px) {
  .page-about .chapter {
    grid-template-columns: 168px minmax(0, 1fr);
    column-gap: 64px;
  }

  .page-about .about-toc {
    margin-bottom: 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc a,
  .page-about .chapter-body a {
    transition: none;
  }
}