.page-about {
  --about-rail: 62px;
  --about-measure: 60ch;
  background: var(--night);
  color: var(--field);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 4vw, 44px) 0 clamp(34px, 6vw, 68px);
  background:
    radial-gradient(90% 70% at 88% -18%, rgba(30, 107, 69, .55), transparent 62%),
    radial-gradient(60% 54% at 4% 112%, rgba(242, 178, 51, .14), transparent 72%),
    linear-gradient(180deg, var(--night) 0%, var(--stand) 100%);
  border-bottom: 1px solid rgba(220, 211, 196, .16);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--turf) 0%, var(--amber) 44%, var(--cyan) 76%, var(--rose) 100%);
  opacity: .85;
}

.page-about .about-hero .breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
}

.page-about .about-hero .breadcrumb a {
  color: rgba(247, 250, 248, .72);
  text-decoration: none;
}

.page-about .about-hero .breadcrumb a:hover,
.page-about .about-hero .breadcrumb a:focus-visible {
  color: var(--amber);
}

.page-about .hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: clamp(20px, 4vw, 34px) 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--turf-lift);
}

.page-about .hero__eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--amber);
}

.page-about .hero__title {
  margin: 14px 0 0;
  max-width: 16ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(40px, 10vw, 88px);
  line-height: 1.02;
  letter-spacing: -.01em;
  color: var(--field);
}

.page-about .hero__title em {
  font-style: normal;
  color: var(--amber);
}

.page-about .hero__lede {
  max-width: 58ch;
  margin: clamp(16px, 3vw, 26px) 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(247, 250, 248, .78);
}

.page-about .hero__stats {
  list-style: none;
  margin: clamp(26px, 5vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(220, 211, 196, .2);
  border: 1px solid rgba(220, 211, 196, .2);
}

.page-about .hero__stats li {
  background: rgba(11, 27, 43, .74);
  padding: 14px 16px;
}

.page-about .hero__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 4vw, 30px);
  line-height: 1.1;
  color: var(--amber);
}

.page-about .hero__label {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  letter-spacing: .05em;
  color: rgba(247, 250, 248, .64);
}

/* ---------- 章节索引条 ---------- */
.page-about .about-index {
  background: var(--stand);
  border-bottom: 1px solid rgba(220, 211, 196, .14);
  padding: 11px 0;
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border: 1px solid rgba(220, 211, 196, .24);
  border-radius: var(--radius-pill);
  font-size: 13px;
  white-space: nowrap;
  color: rgba(247, 250, 248, .78);
  text-decoration: none;
  transition: border-color .18s ease, color .18s ease;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-color: var(--amber);
  color: var(--amber);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--turf-lift);
}

/* ---------- 纸张画布 ---------- */
.page-about .about-canvas {
  padding: clamp(26px, 5vw, 62px) 0 clamp(40px, 7vw, 88px);
  background:
    radial-gradient(70% 42% at 50% 0%, rgba(30, 107, 69, .16), transparent 72%),
    var(--night);
}

.page-about .about-paper {
  position: relative;
  background: var(--paper);
  border: 1px solid var(--paper-edge);
  padding: clamp(14px, 3vw, 52px) clamp(14px, 3vw, 52px);
  color: var(--rock);
}

.page-about .about-paper::before,
.page-about .about-paper::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--paper);
  border: 1px solid var(--paper-edge);
}

.page-about .about-paper::before {
  transform: translate(7px, 7px);
}

.page-about .about-paper::after {
  transform: translate(14px, 14px);
  background: #E7DFD0;
}

/* ---------- 编年章节 ---------- */
.page-about .chapters {
  position: relative;
}

.page-about .chapters::before {
  content: "";
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: calc(var(--about-rail) - 1px);
  width: 1px;
  background: linear-gradient(180deg, transparent 0%, rgba(180, 100, 60, .55) 5%, rgba(180, 100, 60, .55) 95%, transparent 100%);
}

.page-about .chapter {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  column-gap: 0;
  padding-bottom: clamp(28px, 5vw, 54px);
}

.page-about .chapter + .chapter {
  padding-top: clamp(28px, 5vw, 54px);
}

.page-about .chapter + .chapter::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: min(190px, 55%);
  height: 5px;
  border-radius: 2px;
  background: repeating-linear-gradient(90deg, rgba(30, 107, 69, .58) 0 13px, rgba(30, 107, 69, .1) 13px 26px);
}

.page-about .chapter__year {
  grid-column: 1;
  margin: 0;
  padding: 5px 12px 0 0;
  text-align: right;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--clay);
}

.page-about .chapter__title {
  grid-column: 2;
  margin: 0 0 14px;
  padding-left: 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 4.4vw, 36px);
  line-height: 1.22;
  letter-spacing: -.005em;
  color: var(--night);
}

.page-about .chapter__body {
  grid-column: 2;
  padding-left: 12px;
  max-width: var(--about-measure);
}

.page-about .chapter__body p {
  margin: 0 0 1em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--rock);
}

.page-about .chapter__note {
  margin: 14px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--amber);
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(58, 65, 73, .84);
}

/* ---------- 三条数据线清单 ---------- */
.page-about .line-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  border-top: 1px solid rgba(58, 65, 73, .24);
}

.page-about .line-list__item {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 0 10px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(58, 65, 73, .16);
}

.page-about .line-list__num {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--turf);
}

.page-about .line-list__name {
  margin: 0 0 5px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 19px;
  line-height: 1.3;
  color: var(--night);
}

.page-about .line-list__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--rock);
}

/* ---------- 折线示意 ---------- */
.page-about .growth {
  margin: 22px 0 0;
  padding: 16px 14px 12px;
  border: 1px solid rgba(58, 65, 73, .22);
  background: linear-gradient(180deg, #FBF9F4 0%, var(--field) 100%);
  overflow-x: auto;
}

.page-about .growth svg {
  display: block;
  width: 100%;
  min-width: 400px;
  height: auto;
}

.page-about .growth figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.7;
  color: rgba(58, 65, 73, .72);
}

/* ---------- 比分牌式口径表 ---------- */
.page-about .board {
  margin-top: 20px;
  border: 1px solid rgba(58, 65, 73, .28);
  background: var(--field);
}

.page-about .board__head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin: 0;
  padding: 8px 14px;
  background: var(--stand);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
}

.page-about .board__row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 11px 14px;
  border-top: 1px solid rgba(58, 65, 73, .16);
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--night);
}

.page-about .board__row span:first-child {
  color: var(--clay);
}

/* ---------- 图片 ---------- */
.page-about .shot {
  position: relative;
  margin: 22px 0 0;
  border: 1px solid var(--paper-edge);
  background: var(--night);
}

.page-about .shot::after {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 64px;
  height: 4px;
  background: var(--amber);
}

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

.page-about .shot figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--paper-edge);
  background: var(--field);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.75;
  color: rgba(58, 65, 73, .74);
}

/* ---------- 编辑准则编号条 ---------- */
.page-about .rules {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  border-top: 1px solid rgba(58, 65, 73, .24);
}

.page-about .rules__item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 0 10px;
  padding: 13px 0;
  border-bottom: 1px solid rgba(58, 65, 73, .16);
}

.page-about .rules__num {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--amber);
  text-shadow: 0 0 0 transparent;
  -webkit-text-stroke: .4px rgba(180, 100, 60, .8);
}

.page-about .rules__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--rock);
}

/* ---------- 折叠 ---------- */
.page-about .fold {
  margin-top: 20px;
  border: 1px solid rgba(58, 65, 73, .24);
  background: var(--field);
}

.page-about .fold__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--turf);
}

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

.page-about .fold__summary::after {
  content: "＋";
  color: var(--clay);
}

.page-about .fold[open] .fold__summary::after {
  content: "－";
}

.page-about .fold__list {
  margin: 0;
  padding: 2px 18px 18px 34px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--rock);
}

.page-about .fold__list li {
  margin-bottom: 7px;
}

.page-about .fold__list li:last-child {
  margin-bottom: 0;
}

/* ---------- 联络信息 ---------- */
.page-about .contact-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  border-top: 1px solid rgba(58, 65, 73, .24);
}

.page-about .contact-list li {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid rgba(58, 65, 73, .16);
}

.page-about .contact-list__k {
  font-size: 12.5px;
  letter-spacing: .04em;
  color: rgba(58, 65, 73, .7);
}

.page-about .contact-list__v {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--night);
  word-break: break-word;
}

/* ---------- 页末入口 ---------- */
.page-about .about-next {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(24px, 5vw, 44px);
  padding-top: 22px;
  border-top: 1px solid rgba(58, 65, 73, .2);
}

.page-about .about-next a {
  display: inline-flex;
  align-items: center;
  padding: 9px 16px;
  border: 1px solid rgba(58, 65, 73, .3);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--night);
  text-decoration: none;
  transition: border-color .18s ease, color .18s ease, background-color .18s ease;
}

.page-about .about-next a:hover,
.page-about .about-next a:focus-visible {
  border-color: var(--turf);
  background: rgba(30, 107, 69, .08);
  color: var(--turf);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about {
    --about-rail: 84px;
  }

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

  .page-about .chapter__year {
    font-size: 12.5px;
    padding-right: 16px;
  }

  .page-about .chapter__title,
  .page-about .chapter__body {
    padding-left: 16px;
  }
}

@media (min-width: 1020px) {
  .page-about {
    --about-rail: 120px;
  }

  .page-about .hero__title {
    max-width: 18ch;
  }

  .page-about .chapter__year {
    padding-right: 26px;
  }

  .page-about .chapter__title,
  .page-about .chapter__body {
    padding-left: 26px;
  }

  .page-about .chapter__note {
    margin-left: 26px;
    padding-left: 14px;
  }
}

@media (min-width: 1280px) {
  .page-about {
    --about-rail: 140px;
  }
}

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