.page-about {
  --about-rail-w: 236px;
  --about-gap: clamp(1.75rem, 4vw, 3.5rem);
  --about-body-max: 68ch;
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

/* 面包屑 */
.page-about .breadcrumb {
  padding-top: clamp(1.25rem, 3vw, 2rem);
}
.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  color: var(--sand-2);
}
.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 0.35rem;
  color: var(--line-2);
}
.page-about .breadcrumb a {
  color: var(--sand-2);
  text-decoration: none;
  border-bottom: 1px solid var(--line-soft-2);
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--cyan);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.75rem, 5vw, 3.5rem) 0 clamp(2rem, 4vw, 3rem);
}
.page-about .about-hero__ghost {
  position: absolute;
  top: 0.4rem;
  right: -0.05em;
  font-family: var(--font-num);
  font-weight: 800;
  font-size: clamp(6rem, 20vw, 15rem);
  line-height: 0.8;
  letter-spacing: -0.06em;
  color: rgba(34, 240, 206, 0.07);
  pointer-events: none;
  user-select: none;
}
.page-about .about-hero .eyebrow,
.page-about .about-hero__title,
.page-about .about-hero__lead,
.page-about .about-stats {
  position: relative;
  z-index: 1;
}
.page-about .about-hero__title {
  margin: 0.35em 0 0;
  font-size: clamp(2.5rem, 8.4vw, 5.8rem);
  font-weight: 900;
  line-height: 0.96;
  letter-spacing: -0.045em;
  color: var(--sand);
}
.page-about .about-hero__lead {
  margin: clamp(1rem, 2.4vw, 1.6rem) 0 0;
  max-width: 62ch;
  font-size: clamp(0.98rem, 1.3vw, 1.1rem);
  line-height: 1.85;
  color: var(--sand-2);
}
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(0.9rem, 2.4vw, 1.6rem);
  margin: clamp(1.75rem, 4vw, 2.75rem) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
  padding-top: clamp(1.1rem, 2.6vw, 1.75rem);
}
.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 0;
}
.page-about .about-stat__value {
  font-family: var(--font-num);
  font-size: clamp(1.5rem, 4.4vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
  word-break: break-word;
}
.page-about .about-stat__label {
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--sand-2);
}

/* 主版式：窄栏 + 宽内容区 */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 3.25rem);
  margin-top: clamp(1.5rem, 4vw, 2.75rem);
}

/* 左侧常驻栏 */
.page-about .about-rail {
  position: relative;
  border-top: 1px solid var(--line);
  padding-top: 1rem;
}
.page-about .about-rail__title {
  margin: 0 0 0.75rem;
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--cyan);
}
.page-about .about-rail__list {
  display: grid;
  gap: 0.15rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.45rem 0.75rem;
  border-left: 2px solid transparent;
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  font-size: 0.83rem;
  line-height: 1.5;
  color: var(--sand-2);
  text-decoration: none;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), background-color 0.25s var(--ease);
}
.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--sand);
  border-left-color: var(--cyan);
  background: rgba(34, 240, 206, 0.07);
}
.page-about .about-rail__idx {
  font-family: var(--font-num);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
}
.page-about .about-rail__scale {
  margin-top: 1.5rem;
  padding-top: 1.15rem;
  border-top: 1px solid var(--line-soft);
}
.page-about .about-rail__subtitle {
  margin: 0 0 0.6rem;
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  color: var(--sand-2);
}
.page-about .about-scale {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.page-about .about-scale__node {
  font-family: var(--font-num);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  padding: 0.25rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  color: var(--sand-2);
  text-decoration: none;
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease), background-color 0.22s var(--ease);
}
.page-about .about-scale__node:hover,
.page-about .about-scale__node:focus-visible {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* 章节 */
.page-about .about-flow {
  min-width: 0;
}
.page-about .chapter {
  position: relative;
  padding-top: clamp(0.5rem, 1.5vw, 1rem);
}
.page-about .chapter::before {
  content: "";
  display: block;
  width: 64px;
  height: 4px;
  margin-bottom: clamp(0.9rem, 2vw, 1.4rem);
  border-radius: 2px;
  background: var(--cyan);
  transform: skewX(-26deg);
}
.page-about .chapter__kicker {
  margin: 0;
  font-family: var(--font-num);
  font-weight: 200;
  font-size: clamp(2.3rem, 6vw, 4.2rem);
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: var(--cyan-soft);
  -webkit-text-stroke: 1px var(--line-2);
}
.page-about .chapter__title {
  margin: 0.35rem 0 clamp(1rem, 2.4vw, 1.6rem);
  font-size: clamp(1.45rem, 3.4vw, 2.4rem);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.025em;
  color: var(--sand);
}
.page-about .chapter__body {
  max-width: var(--about-body-max);
  color: var(--sand-2);
  font-size: 0.96rem;
  line-height: 1.82;
}
.page-about .chapter__body p {
  margin: 0 0 1.05em;
}
.page-about .chapter__body > .chapter__body {
  margin-top: 1.2rem;
}

/* 图文错位并置 */
.page-about .chapter__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 3vw, 2rem);
}
.page-about .about-figure {
  margin: 0;
  min-width: 0;
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--r-block);
  object-fit: cover;
  border: 1px solid var(--line-soft);
}

/* 口径提示条 */
.page-about .caliber-note {
  margin: 1.4rem 0 0;
  padding: 0.95rem 1.15rem;
  border-left: 3px solid var(--cyan);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: linear-gradient(90deg, var(--cyan-soft), rgba(14, 63, 71, 0));
  color: var(--sand-2);
  font-size: 0.9rem;
  line-height: 1.75;
}
.page-about .caliber-note__tag {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

/* 球场线分隔 */
.page-about .about-slice {
  position: relative;
  height: 1px;
  margin: clamp(2.25rem, 5vw, 3.75rem) 0;
  background: var(--line-soft);
}
.page-about .about-slice::after {
  content: "";
  position: absolute;
  left: 0;
  top: -2.5px;
  width: 128px;
  height: 6px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--cyan), rgba(34, 240, 206, 0));
}

/* 七类归档清单 */
.page-about .ledger-list {
  display: grid;
  gap: 0.85rem;
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
}
.page-about .ledger-item {
  display: grid;
  gap: 0.55rem;
  padding: 1rem 1.1rem;
  border: 1px solid rgba(34, 240, 206, 0.14);
  border-radius: var(--r-block);
  background: var(--ink-2);
}
.page-about .ledger-item__head {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}
.page-about .ledger-item__idx {
  flex: none;
  font-family: var(--font-num);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  padding: 0.2rem 0.55rem;
  border-radius: var(--r-pill);
  background: var(--cyan-soft);
  color: var(--cyan);
}
.page-about .ledger-item__name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--sand);
}
.page-about .ledger-item__row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.6rem;
  align-items: baseline;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--sand-2);
}
.page-about .ledger-item__key {
  flex: none;
  padding: 0.08rem 0.45rem;
  border: 1px solid var(--line-2);
  border-radius: var(--r-pill);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
  white-space: nowrap;
}
.page-about .ledger-item__key--no {
  border-style: dashed;
  border-color: var(--line-soft-2);
  color: var(--sand-2);
}
.page-about .about-figure--aside img {
  object-fit: cover;
}

/* 分段规则表 */
.page-about .rule-list {
  margin: 1.4rem 0 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-soft);
}
.page-about .rule-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.3rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .rule-item dt {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--cyan);
}
.page-about .rule-item dd {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--sand-2);
}

/* 净胜球正负图例 */
.page-about .net-legend {
  display: grid;
  gap: 0.8rem;
  margin: 1.5rem 0 0;
  padding: 1.1rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-block);
  background: var(--ink-2);
}
.page-about .net-legend__row {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 0.85rem;
  align-items: center;
}
.page-about .net-legend__swatch {
  position: relative;
  display: block;
  height: 10px;
  border-radius: var(--r-pill);
  background: var(--ink-3);
  overflow: hidden;
}
.page-about .net-legend__swatch::after {
  content: "";
  position: absolute;
  inset: 0 50% 0 0;
  border-radius: var(--r-pill);
}
.page-about .net-legend__swatch--plus::after {
  inset: 0 34% 0 0;
  background: var(--grass);
}
.page-about .net-legend__swatch--zero::after {
  inset: 0;
  background: var(--sand-2);
}
.page-about .net-legend__swatch--minus::after {
  inset: 0 0 0 34%;
  background: var(--coral);
}
.page-about .net-legend__text {
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--sand-2);
}

/* 术语悬停注释 */
.page-about .term {
  position: relative;
  display: inline-block;
  color: var(--sand);
  border-bottom: 1px dashed var(--line-2);
  cursor: help;
}
.page-about .term:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}
.page-about .term__pop {
  position: absolute;
  left: 0;
  bottom: calc(100% + 0.55rem);
  width: min(20rem, 76vw);
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--line-2);
  border-radius: var(--r-sm);
  background: var(--ink-3);
  color: var(--sand);
  font-size: 0.82rem;
  line-height: 1.65;
  letter-spacing: 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity 0.22s var(--ease), transform 0.22s var(--ease), visibility 0.22s;
  z-index: 20;
}
.page-about .term:hover .term__pop,
.page-about .term:focus-visible .term__pop {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* 复核流程折叠 */
.page-about .flow {
  display: grid;
  gap: 0.6rem;
  margin: 1.4rem 0 1.4rem;
}
.page-about .flow-step {
  border: 1px solid var(--line-soft);
  border-radius: var(--r-sm);
  background: var(--ink-2);
  transition: border-color 0.25s var(--ease);
}
.page-about .flow-step[open] {
  border-color: var(--line-2);
}
.page-about .flow-step summary {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.85rem 1rem;
  cursor: pointer;
  list-style: none;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--sand);
}
.page-about .flow-step summary::-webkit-details-marker {
  display: none;
}
.page-about .flow-step summary::after {
  content: "＋";
  margin-left: auto;
  font-size: 0.95rem;
  color: var(--cyan);
  transition: transform 0.25s var(--ease);
}
.page-about .flow-step[open] summary::after {
  transform: rotate(45deg);
}
.page-about .flow-step summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
  border-radius: var(--r-sm);
}
.page-about .flow-step__idx {
  font-family: var(--font-num);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  padding: 0.18rem 0.5rem;
  border-radius: var(--r-pill);
  background: var(--cyan-soft);
  color: var(--cyan);
}
.page-about .flow-step__body {
  padding: 0 1rem 1rem 1rem;
  font-size: 0.89rem;
  line-height: 1.78;
  color: var(--sand-2);
}

/* 赛季里程碑 */
.page-about .era-list {
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}
.page-about .era-item {
  position: relative;
  padding: 0 0 1.7rem 3.2rem;
}
.page-about .era-item::before {
  content: "";
  position: absolute;
  left: 1.15rem;
  top: 2.5rem;
  bottom: -0.2rem;
  width: 1px;
  background: var(--line);
}
.page-about .era-item:last-child::before {
  display: none;
}
.page-about .era-item__badge {
  position: absolute;
  left: 0;
  top: 0;
  width: 2.35rem;
  height: 2.35rem;
  display: grid;
  place-items: center;
  font-family: var(--font-num);
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--ink);
  background: var(--cyan);
  border-radius: var(--r-sm);
  clip-path: polygon(0 0, 100% 0, 100% 70%, 68% 100%, 0 100%);
}
.page-about .era-item__year {
  margin: 0;
  font-family: var(--font-num);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cyan);
}
.page-about .era-item__title {
  margin: 0.2rem 0 0.35rem;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--sand);
}
.page-about .era-item__text {
  margin: 0;
  max-width: 58ch;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--sand-2);
}

/* 通栏收束图 */
.page-about .about-figure--wide {
  margin-top: clamp(2.25rem, 5vw, 3.5rem);
}
.page-about .about-figure--wide img {
  border-radius: var(--r-panel);
}

/* 收尾说明 */
.page-about .about-closing {
  margin-top: clamp(2rem, 4.5vw, 3rem);
  padding: clamp(1.2rem, 3vw, 1.9rem);
  border: 1px solid var(--line);
  border-radius: var(--r-panel);
  background: linear-gradient(135deg, var(--ink-2), var(--ink));
}
.page-about .about-closing__title {
  margin: 0 0 0.7rem;
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  font-weight: 800;
  letter-spacing: -0.015em;
  color: var(--sand);
}
.page-about .about-closing p {
  margin: 0 0 0.8rem;
  max-width: 60ch;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--sand-2);
}
.page-about .about-closing__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
  margin-top: 1rem;
}
.page-about .about-closing__dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--line-2);
}

/* 通用文字链接 */
.page-about .about-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-2);
  transition: border-color 0.22s var(--ease), color 0.22s var(--ease);
}
.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  border-bottom-color: var(--cyan);
}

/* 入场点亮 */
.js .page-about [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
}
.page-about [data-reveal] {
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
  transition-delay: var(--reveal-delay, 0s);
}
.page-about [data-reveal][data-revealed] {
  opacity: 1;
  transform: none;
}

/* 桌面：常驻窄栏 + 宽内容区 */
@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }
  .page-about .about-rail {
    position: sticky;
    top: 5.5rem;
    align-self: start;
    max-height: calc(100vh - 8rem);
    overflow-y: auto;
    border-top: none;
    border-left: 1px solid var(--line-soft);
    padding: 0 0 0 1.25rem;
  }
  .page-about .chapter__split--offset {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
  }
  .page-about .chapter__split--offset .about-figure {
    margin-top: clamp(1.5rem, 5vw, 3.25rem);
  }
  .page-about .chapter__split--aside {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: clamp(1.5rem, 3vw, 2.5rem);
    align-items: start;
  }
  .page-about .about-figure--aside {
    position: sticky;
    top: 6rem;
  }
  .page-about .about-figure--aside img {
    aspect-ratio: 1 / 1;
  }
}

/* 宽屏微调 */
@media (min-width: 1280px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .rule-item {
    grid-template-columns: minmax(0, 9rem) minmax(0, 1fr);
    gap: 1rem;
    align-items: baseline;
  }
}

/* 动效降级 */
@media (prefers-reduced-motion: reduce) {
  .js .page-about [data-reveal] {
    opacity: 1;
    transform: none;
  }
  .page-about [data-reveal],
  .page-about .term__pop,
  .page-about .flow-step summary::after {
    transition: none;
  }
}

.page-about {
  --reveal-delay: 0.3s;
}