.page-about {
  --about-rail-w: 212px;
  --about-body-w: 44em;
  display: block;
  padding-bottom: clamp(48px, 8vw, 112px);
  background:
    radial-gradient(120% 60% at 8% 0%, rgba(75, 58, 143, .22) 0%, rgba(75, 58, 143, 0) 62%),
    radial-gradient(90% 50% at 100% 12%, rgba(47, 224, 208, .12) 0%, rgba(47, 224, 208, 0) 60%);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: clamp(20px, 3vw, 32px);
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--fog);
}

.page-about .breadcrumb a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 160ms var(--ease), color 160ms var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  border-bottom-color: var(--cyan);
}

.page-about .breadcrumb .rule {
  color: var(--mist);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
  padding-top: clamp(24px, 4vw, 52px);
  padding-bottom: clamp(32px, 6vw, 76px);
}

.page-about .about-h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6.4vw, 66px);
  line-height: 1.06;
  letter-spacing: -.01em;
  color: var(--porcelain);
}

.page-about .about-hero__lead .lede {
  margin-top: 20px;
  color: var(--porcelain);
  font-size: 16.5px;
  line-height: 1.85;
}

.page-about .about-hero__aside {
  display: grid;
  gap: 16px;
}

.page-about .about-figure {
  position: relative;
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line-cyan);
  background: var(--indigo);
}

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

.page-about .about-figure--flow {
  margin-top: 26px;
}

.page-about .about-figure--flow img {
  aspect-ratio: 16 / 9;
}

.page-about .about-figure .frame__cap {
  padding: 11px 16px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--fog);
}

.page-about .about-nums {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 22px 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-nums > div {
  padding: 14px 16px;
  background: rgba(19, 43, 82, .82);
}

.page-about .about-nums dt {
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--fog);
}

.page-about .about-nums dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(20px, 3.4vw, 26px);
  line-height: 1.1;
  color: var(--porcelain);
  text-shadow: 0 0 12px var(--line-cyan);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .about-rail {
  padding: 18px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: rgba(19, 43, 82, .68);
}

.page-about .rail__title {
  margin: 0;
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--fog);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-rail__link {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 9px 10px;
  border-radius: var(--r-sm);
  border-left: 2px solid transparent;
  color: var(--fog);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.45;
  transition: color 160ms var(--ease), background 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--porcelain);
  background: rgba(47, 224, 208, .08);
  border-left-color: var(--cyan);
}

.page-about .about-rail__link[aria-current="true"] {
  color: var(--cyan);
  background: rgba(47, 224, 208, .1);
  border-left-color: var(--cyan);
}

.page-about .about-rail__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--amber);
}

.page-about .about-rail__stats {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.page-about .about-rail__stats p {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--fog);
}

.page-about .about-rail__stat {
  margin-right: 6px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 16px;
  color: var(--neon);
}

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

/* ---------- 章节抬头与正文 ---------- */
.page-about .about-section {
  padding: clamp(26px, 4.4vw, 52px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--amber);
}

.page-about .about-h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 3.8vw, 42px);
  line-height: 1.14;
  letter-spacing: -.005em;
  color: var(--porcelain);
}

.page-about .about-main p {
  max-width: var(--about-body-w);
  margin: 16px 0 0;
  color: var(--porcelain);
  font-size: 16.5px;
  line-height: 1.85;
}

/* ---------- 阶段时间轴 ---------- */
.page-about .about-stages {
  position: relative;
  list-style: none;
  margin: 28px 0 0;
  padding: 0 0 0 26px;
  display: grid;
  gap: 14px;
}

.page-about .about-stages::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--violet) 52%, var(--wine) 100%);
  opacity: .6;
}

.page-about .about-stage {
  position: relative;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(19, 43, 82, .78);
  animation: about-slide-in 460ms var(--ease) both;
  transition: border-color 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 22px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(47, 224, 208, .14);
}

.page-about .about-stage:nth-child(2) { animation-delay: 60ms; }
.page-about .about-stage:nth-child(3) { animation-delay: 120ms; }
.page-about .about-stage:nth-child(4) { animation-delay: 180ms; }

.page-about .about-stage:hover {
  border-color: var(--line-cyan);
  transform: translateX(2px);
}

.page-about .about-stage__era {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--neon);
}

.page-about .about-stage__text {
  margin: 8px 0 0;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--porcelain);
}

@keyframes about-slide-in {
  from { opacity: 0; transform: translateX(-10px); }
  to { opacity: 1; transform: translateX(0); }
}

/* ---------- 团队分工 ---------- */
.page-about .about-team {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-team__item {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(19, 43, 82, .6);
  transition: border-color 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .about-team__item:hover {
  border-color: var(--line-cyan);
  transform: translateY(-2px);
}

.page-about .about-team__num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 34px;
  line-height: 1;
  color: var(--cyan);
  text-shadow: 0 0 14px var(--line-cyan);
}

.page-about .about-team__role {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  letter-spacing: .01em;
  color: var(--porcelain);
}

.page-about .about-team__text {
  margin: 8px 0 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--fog);
}

/* ---------- 生产流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  counter-reset: about-step;
}

.page-about .about-step {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  border-top: 2px solid var(--line-cyan);
  background: rgba(19, 43, 82, .72);
}

.page-about .about-step__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--amber);
}

.page-about .about-step__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 20px;
  color: var(--porcelain);
}

.page-about .about-step__body {
  margin: 8px 0 0;
  max-width: 30em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--fog);
}

/* ---------- 赛季节奏 ---------- */
.page-about .about-season {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-season__card {
  padding: 20px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: rgba(11, 30, 58, .72);
}

.page-about .about-season__card--cyan { border-top: 3px solid var(--cyan); }
.page-about .about-season__card--amber { border-top: 3px solid var(--amber); }
.page-about .about-season__card--violet { border-top: 3px solid var(--violet); }

.page-about .about-season__tag {
  margin: 0;
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--fog);
}

.page-about .about-season__body {
  margin: 12px 0 0;
  max-width: 30em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--porcelain);
}

/* ---------- 四端 ---------- */
.page-about .about-ends {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-end {
  padding: 20px;
  border-radius: var(--r-lg);
  color: var(--porcelain);
  transition: transform 180ms var(--ease);
}

.page-about .about-end--abyss { background: var(--abyss); border: 1px solid var(--line-cyan); }
.page-about .about-end--indigo { background: var(--indigo); border: 1px solid var(--line-cyan); }
.page-about .about-end--wine { background: var(--wine); border: 1px solid rgba(232, 238, 247, .18); }
.page-about .about-end--violet { background: var(--violet); border: 1px solid rgba(232, 238, 247, .18); }

.page-about .about-end:hover {
  transform: translateY(-3px);
}

.page-about .about-end__tag {
  margin: 0;
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--r-pill);
  background: rgba(11, 30, 58, .5);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--porcelain);
}

.page-about .about-end__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 21px;
  color: var(--porcelain);
}

.page-about .about-end__text {
  margin: 8px 0 0;
  max-width: 26em;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(232, 238, 247, .84);
}

/* ---------- 数据来源 ---------- */
.page-about .about-data {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3.4vw, 40px);
  align-items: start;
}

.page-about .about-data__list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-data__list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 13px 16px;
  background: rgba(19, 43, 82, .78);
}

.page-about .about-data__k {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--fog);
}

.page-about .about-data__v {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 16px;
  color: var(--neon);
  text-align: right;
}

/* ---------- 衡量标准 ---------- */
.page-about .about-std {
  margin-top: 26px;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-std__row {
  padding: 20px;
  background: rgba(19, 43, 82, .78);
}

.page-about .about-std__key {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-about .about-std__val {
  margin: 8px 0 0;
  max-width: 42em;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--porcelain);
}

/* ---------- 下一页入口 ---------- */
.page-about .about-next {
  padding-top: clamp(28px, 4.4vw, 52px);
  border-top: 1px solid var(--line);
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: 22px;
}

.page-about .about-next__card {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(19, 43, 82, .6);
  text-decoration: none;
  transition: border-color 160ms var(--ease), transform 160ms var(--ease), background 160ms var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  border-color: var(--cyan);
  background: rgba(47, 224, 208, .08);
  transform: translateY(-2px);
}

.page-about .about-next__label {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  color: var(--porcelain);
}

.page-about .about-next__desc {
  font-size: 14px;
  line-height: 1.65;
  color: var(--fog);
}

/* ---------- 栅格与响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-season {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-ends {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-next__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 1000px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-hero__aside {
    margin-top: 44px;
  }

  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--head-h) + 20px);
    max-height: calc(100vh - var(--head-h) - 48px);
    overflow-y: auto;
  }

  .page-about .about-season {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-data {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  }

  .page-about .about-next__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1200px) {
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stage {
    animation: none;
  }

  .page-about .about-stage:hover,
  .page-about .about-team__item:hover,
  .page-about .about-end:hover,
  .page-about .about-next__card:hover,
  .page-about .about-next__card:focus-visible {
    transform: none;
  }
}