.page-about {
  --about-gap: clamp(22px, 4vw, 56px);
  --about-pad: clamp(18px, 3vw, 28px);
  --about-accent: var(--ams-silver);
  background: var(--ams-night);
  color: var(--ams-cream);
}

/* 面包屑 */
.page-about .about-crumb {
  padding-top: clamp(18px, 3vw, 30px);
}

/* 首屏 */
.page-about .about-hero {
  padding-top: clamp(20px, 3.4vw, 40px);
  padding-bottom: clamp(32px, 5vw, 58px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  align-items: center;
}

.page-about .about-hero__text {
  min-width: 0;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(22px, 4vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-top: 10px;
  border-top: 2px solid var(--ams-line-dark);
}

.page-about .about-hero__num {
  flex: 0 0 auto;
  font-family: var(--ams-font-display);
  font-size: clamp(38px, 7vw, 54px);
  line-height: .88;
  letter-spacing: -.02em;
  color: var(--ams-lime);
}

.page-about .about-hero__cap {
  font-size: 14px;
  line-height: 1.55;
  color: var(--ams-cream-70);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 4vw, 34px);
}

.page-about .about-hero__visual {
  min-width: 0;
  padding: clamp(12px, 2vw, 20px);
  background: var(--ams-turf);
  border: 3px solid var(--ams-line-dark);
  box-shadow: var(--ams-shadow);
}

.page-about .about-pitch {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-pitch__bg {
  fill: var(--ams-night);
}

.page-about .about-pitch__frame,
.page-about .about-pitch__line {
  fill: none;
  stroke: rgba(185, 196, 192, .32);
  stroke-width: 3;
}

.page-about .about-pitch__heat {
  fill: none;
  stroke-width: 12;
  stroke-linecap: square;
  opacity: .5;
}

.page-about .about-pitch__heat--lime { stroke: var(--ams-lime); }
.page-about .about-pitch__heat--orange { stroke: var(--ams-orange); }

.page-about .about-pitch__node { fill: var(--ams-lime); }
.page-about .about-pitch__node--orange { fill: var(--ams-orange); }

@media (prefers-reduced-motion: no-preference) {
  .page-about .about-pitch__heat {
    stroke-dasharray: 680;
    stroke-dashoffset: 680;
    animation: about-dash 1.9s ease-out forwards;
  }
  .page-about .about-pitch__heat--orange {
    animation-delay: .35s;
  }
}

@keyframes about-dash {
  to { stroke-dashoffset: 0; }
}

/* 主体两栏 */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  padding-top: clamp(34px, 6vw, 72px);
}

.page-about .about-index {
  min-width: 0;
}

.page-about .about-index__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  color: var(--ams-cream-70);
  border: 2px solid var(--ams-line-dark);
  transition: color .18s ease, border-color .18s ease, background-color .18s ease;
}

.page-about .about-index__link:hover {
  color: var(--ams-cream);
  border-color: var(--ams-lime);
}

.page-about .about-index__link[aria-current="true"] {
  color: var(--ams-lime);
  border-color: var(--ams-orange);
  background: rgba(255, 106, 43, .12);
}

.page-about .about-index__no {
  font-family: var(--ams-font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--ams-silver);
}

.page-about .about-flow {
  min-width: 0;
}

/* 章节 */
.page-about .about-chapter {
  padding-bottom: clamp(40px, 6vw, 76px);
}

.page-about .about-chapter + .about-chapter {
  padding-top: clamp(40px, 6vw, 76px);
  border-top: 2px solid var(--ams-line-dark);
}

.page-about .about-chapter__head {
  max-width: 68ch;
  margin-bottom: clamp(24px, 3.6vw, 42px);
}

.page-about .about-chapter__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3.4vw, 34px);
}

/* 时间轴 */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 20px 0 20px 28px;
  border-top: 2px dashed var(--ams-line-dark);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 27px;
  width: 10px;
  height: 10px;
  background: var(--ams-orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 43, .18);
}

.page-about .about-timeline__item::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 43px;
  bottom: -2px;
  width: 2px;
  background: var(--ams-line-dark);
}

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

.page-about .about-timeline__mark {
  display: block;
  margin-bottom: 6px;
  font-family: var(--ams-font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--ams-silver);
}

.page-about .about-timeline__body p {
  margin: 8px 0 0;
  color: var(--ams-cream-82);
  line-height: 1.7;
}

/* 横幅图 */
.page-about .about-banner {
  margin: clamp(28px, 4vw, 46px) 0 0;
  background: var(--ams-turf);
  border: 3px solid var(--ams-line-dark);
  box-shadow: var(--ams-shadow);
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.page-about .about-banner__cap {
  padding: 10px 14px;
  font-family: var(--ams-font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--ams-cream-70);
  border-top: 3px solid var(--ams-line-dark);
}

/* 梯队阶梯 */
.page-about .about-ladder {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-ladder__step {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding: var(--about-pad);
  background: var(--ams-turf);
  border: 3px solid var(--ams-line-dark);
  border-left: 8px solid var(--about-accent);
  transition: transform .18s ease, box-shadow .18s ease;
}

.page-about .about-ladder__step:nth-child(1) { --about-accent: var(--ams-silver); }
.page-about .about-ladder__step:nth-child(2) { --about-accent: var(--ams-lime-soft); }
.page-about .about-ladder__step:nth-child(3) { --about-accent: var(--ams-lime); }
.page-about .about-ladder__step:nth-child(4) { --about-accent: var(--ams-amber); }
.page-about .about-ladder__step:nth-child(5) { --about-accent: var(--ams-orange); }

.page-about .about-ladder__age {
  font-family: var(--ams-font-display);
  font-size: clamp(34px, 6vw, 46px);
  line-height: .92;
  letter-spacing: -.01em;
  color: var(--about-accent);
}

.page-about .about-ladder__info p {
  margin: 8px 0 0;
  color: var(--ams-cream-82);
  line-height: 1.7;
}

.page-about .about-ladder__meta {
  font-family: var(--ams-font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--ams-silver) !important;
}

.page-about .about-academy__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: clamp(26px, 4vw, 40px) 0 0;
}

.page-about .about-academy__stat {
  padding: 14px 0;
  border-top: 3px solid var(--ams-lime);
}

.page-about .about-academy__stat dt {
  font-family: var(--ams-font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--ams-cream-70);
}

.page-about .about-academy__stat dd {
  margin: 8px 0 0;
  font-family: var(--ams-font-display);
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.05;
  color: var(--ams-cream);
}

.page-about .about-shot {
  margin: clamp(26px, 4vw, 44px) 0 0;
  border: 3px solid var(--ams-line-dark);
  background: var(--ams-turf);
  box-shadow: var(--ams-shadow-soft);
}

.page-about .about-shot img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-shot__cap {
  padding: 10px 14px;
  font-family: var(--ams-font-mono);
  font-size: 12px;
  color: var(--ams-cream-70);
  border-top: 3px solid var(--ams-line-dark);
}

.page-about .about-note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 14px 16px;
  border-left: 6px solid var(--ams-orange);
  background: rgba(255, 106, 43, .08);
  font-size: 15px;
  line-height: 1.7;
  color: var(--ams-cream-82);
}

/* 球迷服务网络 */
.page-about .about-supporters__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-supporters__text p {
  margin: 0 0 16px;
  color: var(--ams-cream-82);
  line-height: 1.75;
}

.page-about .about-supporters__text .ams-btn {
  margin-top: 6px;
}

.page-about .about-supporters__figure {
  margin: 0;
  border: 3px solid var(--ams-line-dark);
  background: var(--ams-turf);
  box-shadow: var(--ams-shadow);
}

.page-about .about-supporters__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
}

.page-about .about-supporters__cap {
  padding: 10px 14px;
  font-family: var(--ams-font-mono);
  font-size: 12px;
  color: var(--ams-cream-70);
  border-top: 3px solid var(--ams-line-dark);
}

.page-about .about-mapwrap {
  margin-top: clamp(28px, 4vw, 46px);
  padding: clamp(16px, 2.6vw, 26px);
  background: var(--ams-turf);
  border: 3px solid var(--ams-line-dark);
}

.page-about .about-map {
  display: block;
  width: 100%;
  max-width: 560px;
  height: auto;
  margin: 0 auto;
}

.page-about .about-map__outline {
  fill: rgba(198, 255, 61, .05);
  stroke: rgba(185, 196, 192, .3);
  stroke-width: 2;
}

.page-about .about-map__links path {
  fill: none;
  stroke: rgba(185, 196, 192, .25);
  stroke-width: 1.5;
  stroke-dasharray: 5 6;
}

.page-about .about-map__nodes circle {
  fill: var(--ams-lime);
}

.page-about .about-map__nodes circle:nth-child(3n) {
  fill: var(--ams-orange);
}

.page-about .about-mapwrap__cap {
  margin: 14px 0 0;
  text-align: center;
  font-family: var(--ams-font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--ams-cream-70);
}

/* 栏目数据 */
.page-about .about-ledger {
  display: grid;
}

.page-about .about-ledger__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 16px 0;
  border-top: 2px solid var(--ams-line-dark);
  transition: transform .18s ease;
}

.page-about .about-ledger__row:last-child {
  border-bottom: 2px solid var(--ams-line-dark);
}

.page-about .about-ledger__no {
  font-family: var(--ams-font-display);
  font-size: 32px;
  line-height: 1;
  color: var(--ams-lime);
}

.page-about .about-ledger__name {
  font-size: 17px;
  font-weight: 600;
  color: var(--ams-cream);
}

.page-about .about-ledger__note {
  font-size: 14px;
  line-height: 1.6;
  color: var(--ams-cream-70);
  font-family: var(--ams-font-mono);
}

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: clamp(24px, 3.6vw, 36px);
}

.page-about .about-metrics__item {
  padding: 16px 14px;
  background: var(--ams-turf);
  border: 3px solid var(--ams-line-dark);
  border-top: 6px solid var(--ams-silver);
}

.page-about .about-metrics__item--lime { border-top-color: var(--ams-lime); }
.page-about .about-metrics__item--amber { border-top-color: var(--ams-amber); }
.page-about .about-metrics__item--orange { border-top-color: var(--ams-orange); }

.page-about .about-metrics__value {
  display: block;
  font-family: var(--ams-font-display);
  font-size: clamp(28px, 4.4vw, 42px);
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--ams-cream);
}

.page-about .about-metrics__label {
  display: block;
  margin-top: 8px;
  font-family: var(--ams-font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--ams-cream-70);
}

/* 合作生态 */
.page-about .about-eco {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-eco__card {
  padding: var(--about-pad);
  background: var(--ams-turf);
  border: 3px solid var(--ams-line-dark);
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}

.page-about .about-eco__card:hover {
  border-color: var(--ams-lime);
  box-shadow: var(--ams-shadow-soft);
}

.page-about .about-eco__card p {
  margin: 10px 0 0;
  color: var(--ams-cream-82);
  line-height: 1.7;
}

.page-about .about-eco__card .ams-tag {
  margin-bottom: 4px;
}

/* 尾段 */
.page-about .about-cta {
  margin-top: clamp(20px, 4vw, 40px);
  padding: clamp(38px, 6vw, 72px) 0;
  background: var(--ams-turf);
  border-top: 3px solid var(--ams-line-dark);
  border-bottom: 3px solid var(--ams-line-dark);
}

.page-about .about-cta__inner {
  max-width: 820px;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3.4vw, 32px);
}

/* 悬停位移 */
@media (hover: hover) and (min-width: 900px) {
  .page-about .about-ledger__row:hover {
    transform: translateX(10px);
  }
  .page-about .about-ladder__step:hover,
  .page-about .about-eco__card:hover {
    transform: translate(-2px, -2px);
  }
}

/* 平板及以上 */
@media (min-width: 700px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
  .page-about .about-hero__facts li {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  .page-about .about-ladder__step {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 22px;
    align-items: start;
  }
  .page-about .about-academy__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-ledger__row {
    grid-template-columns: 74px minmax(0, 1fr) 1.35fr;
    align-items: baseline;
    gap: 18px;
  }
}

/* 桌面端 */
@media (min-width: 1000px) {
  .page-about .about-hero__grid {
    grid-template-columns: 5fr 7fr;
  }
  .page-about .about-body {
    grid-template-columns: 244px minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-index__inner {
    position: sticky;
    top: 96px;
  }
  .page-about .about-index__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
  }
  .page-about .about-index__link {
    padding: 11px 10px;
    border: 0;
    border-bottom: 1px solid var(--ams-line-dark);
  }
  .page-about .about-index__link:hover {
    background: rgba(198, 255, 61, .08);
  }
  .page-about .about-index__link[aria-current="true"] {
    background: rgba(198, 255, 61, .1);
    border-bottom-color: var(--ams-lime);
  }
  .page-about .about-ladder__step:nth-child(1) { margin-left: 0; }
  .page-about .about-ladder__step:nth-child(2) { margin-left: 18px; }
  .page-about .about-ladder__step:nth-child(3) { margin-left: 36px; }
  .page-about .about-ladder__step:nth-child(4) { margin-left: 54px; }
  .page-about .about-ladder__step:nth-child(5) { margin-left: 72px; }

  .page-about .about-supporters__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  }
  .page-about .about-mapwrap {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 24px;
  }
  .page-about .about-mapwrap__cap {
    margin: 0;
    text-align: left;
    font-size: 14px;
    letter-spacing: .12em;
  }
  .page-about .about-eco {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
  .page-about .about-eco__card--a { grid-column: span 4; }
  .page-about .about-eco__card--b { grid-column: span 2; }
  .page-about .about-eco__card--c { grid-column: span 2; }
  .page-about .about-eco__card--d { grid-column: span 4; }
}