.page-about {
  --about-gap: 3.25rem;
  --about-shadow: 6px 6px 0 rgba(34, 58, 94, 0.55);
  display: block;
  background: var(--ink);
  color: var(--text);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: 1.5rem;
}

.page-about .about-crumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--t12);
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .about-crumb li + li::before {
  content: "/";
  margin-right: 0.4rem;
  color: var(--line);
}

.page-about .about-crumb a {
  color: var(--cyan);
  text-decoration: none;
  transition: color var(--dur-hover) linear;
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--neon);
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 1.75rem 0 3rem;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image: radial-gradient(rgba(79, 214, 255, 0.16) 1px, transparent 1px);
  background-size: 24px 24px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 72%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 72%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2rem;
}

.page-about .about-hero h1 {
  margin: 0.75rem 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2.1rem, 8.5vw, 4rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-hero__lede {
  margin: 1.15rem 0 0;
  max-width: 36em;
  font-size: var(--t16);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 0.9rem 1rem;
  background: var(--night);
  font-family: var(--font-mono);
  font-size: var(--t12);
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-hero__facts .num {
  font-family: var(--font-mono);
  font-size: var(--t28);
  font-weight: 700;
  line-height: 1;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}

/* ---------- 图片容器 ---------- */
.page-about .about-shot {
  margin: 0;
  overflow: hidden;
  border: 2px solid var(--line);
  background: var(--night);
}

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

.page-about .about-shot figcaption {
  padding: 0.7rem 1rem;
  border-top: 2px solid var(--line);
  background: var(--panel);
  font-family: var(--font-mono);
  font-size: var(--t12);
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--muted);
}

/* ---------- 区块骨架 ---------- */
.page-about .about-block {
  position: relative;
  padding: var(--about-gap) 0;
}

.page-about .about-block + .about-block {
  border-top: 2px solid var(--line);
}

.page-about .about-block--band {
  background: var(--night);
  box-shadow: 0 0 0 100vmax var(--night);
  clip-path: inset(0 -100vmax);
}

.page-about .about-head {
  max-width: 44rem;
  margin-bottom: 2.25rem;
}

.page-about .about-head h2 {
  margin: 0.6rem 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.5rem, 5.5vw, 2.25rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-head p {
  margin: 1rem 0 0;
  max-width: 38em;
  font-size: var(--t16);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-foot {
  margin: 2rem 0 0;
  max-width: 46em;
  font-size: var(--t14);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-foot a,
.page-about .about-prose a,
.page-about .about-steps a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(79, 214, 255, 0.4);
  transition: color var(--dur-hover) linear, border-color var(--dur-hover) linear;
}

.page-about .about-foot a:hover,
.page-about .about-prose a:hover,
.page-about .about-steps a:hover,
.page-about .about-foot a:focus-visible,
.page-about .about-prose a:focus-visible,
.page-about .about-steps a:focus-visible {
  color: var(--neon);
  border-color: var(--neon);
}

/* ---------- 通用正文 ---------- */
.page-about .about-prose p {
  margin: 0 0 1.1rem;
  max-width: 38em;
  font-size: var(--t16);
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-prose h3 {
  margin: 1.75rem 0 0.6rem;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--t16);
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .about-prose h3:first-child {
  margin-top: 0;
}

/* ---------- 定位双栏 ---------- */
.page-about .about-grid2 {
  display: grid;
  gap: 2rem;
}

.page-about .about-why__main h2,
.page-about .about-fix__main h2 {
  margin: 0.6rem 0 1.25rem;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.5rem, 5.5vw, 2.25rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-note {
  align-self: start;
  padding: 1.25rem;
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: var(--about-shadow);
}

.page-about .about-note__label {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: var(--t12);
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-note__list {
  display: grid;
  gap: 0.6rem;
  margin: 0 0 1.25rem;
  padding: 0;
  list-style: none;
}

.page-about .about-note__item {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--line);
  font-size: var(--t16);
  color: var(--text);
}

.page-about .about-note__k {
  font-family: var(--font-mono);
  font-size: var(--t12);
  font-weight: 700;
  color: var(--neon);
}

/* ---------- 赛区表格 ---------- */
.page-about .about-shot--wide {
  margin-bottom: 2rem;
}

.page-about .about-region-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 2px solid var(--line);
  background: var(--panel);
}

.page-about .about-region-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
}

.page-about .about-region-table caption {
  caption-side: top;
  padding: 0.9rem 1rem;
  border-bottom: 2px solid var(--line);
  background: var(--ink);
  text-align: left;
  font-family: var(--font-mono);
  font-size: var(--t12);
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .about-region-table th,
.page-about .about-region-table td {
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  font-size: var(--t14);
  line-height: 1.6;
}

.page-about .about-region-table thead th {
  font-family: var(--font-mono);
  font-size: var(--t12);
  letter-spacing: 0.1em;
  color: var(--muted);
  background: var(--night);
  border-bottom: 2px solid var(--line);
}

.page-about .about-region-table tbody th {
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
}

.page-about .about-region-table tbody td {
  color: var(--muted);
}

.page-about .about-region-table .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: var(--amber);
  text-align: right;
}

.page-about .about-region-table tfoot th,
.page-about .about-region-table tfoot td {
  border-bottom: none;
  border-top: 2px solid var(--line);
  background: var(--night);
  color: var(--text);
  font-weight: 700;
}

/* ---------- 批次时间条 ---------- */
.page-about .about-batches {
  display: grid;
  gap: 2px;
  margin-bottom: 2.5rem;
  border: 2px solid var(--line);
  background: var(--line);
}

.page-about .about-batch {
  padding: 1.25rem 1.15rem;
  border-left: 4px solid var(--line);
  background: var(--panel);
  transition: border-color var(--dur-hover) linear, background-color var(--dur-hover) linear;
}

.page-about .about-batch:hover,
.page-about .about-batch:focus-within {
  border-left-color: var(--neon);
  background: var(--night);
}

.page-about .about-batch__time {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--t28);
  font-weight: 700;
  line-height: 1;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}

.page-about .about-batch h3 {
  margin: 0.7rem 0 0.4rem;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: var(--t16);
  color: var(--text);
}

.page-about .about-batch p {
  margin: 0;
  font-size: var(--t14);
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 生产机制 ---------- */
.page-about .about-produce__grid {
  display: grid;
  gap: 2rem;
}

.page-about .about-cadence {
  margin: 1.5rem 0 0;
  border-top: 2px solid var(--line);
}

.page-about .about-cadence > div {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-cadence dt {
  font-size: var(--t14);
  color: var(--muted);
}

.page-about .about-cadence dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--t14);
  font-weight: 700;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-axis {
  position: relative;
  margin: 0;
  padding: 0 0 0 1.75rem;
  list-style: none;
}

.page-about .about-axis::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0.6rem;
  bottom: 0.6rem;
  width: 2px;
  background: var(--line);
}

.page-about .about-axis__item {
  position: relative;
  padding-bottom: 2rem;
}

.page-about .about-axis__item:last-child {
  padding-bottom: 0;
}

.page-about .about-axis__item::before {
  content: "";
  position: absolute;
  left: -1.75rem;
  top: 0.45rem;
  width: 12px;
  height: 12px;
  background: var(--neon);
}

.page-about .about-axis__ver {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--t22);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-axis__item h3 {
  margin: 0.4rem 0 0.35rem;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: var(--t16);
  color: var(--text);
}

.page-about .about-axis__item p {
  margin: 0;
  max-width: 30em;
  font-size: var(--t14);
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 数据偏差 ---------- */
.page-about .about-fix__grid {
  display: grid;
  gap: 2rem;
}

.page-about .about-steps {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 2px solid var(--line);
  background: var(--line);
}

.page-about .about-steps li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  padding: 1.1rem 1.15rem;
  background: var(--panel);
}

.page-about .about-steps__k {
  font-family: var(--font-mono);
  font-size: var(--t14);
  font-weight: 700;
  color: var(--neon);
}

.page-about .about-steps h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: var(--t16);
  color: var(--text);
}

.page-about .about-steps p {
  margin: 0;
  font-size: var(--t14);
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-aside {
  align-self: start;
  padding: 1.25rem;
  border: 2px solid var(--line);
  border-left: 4px solid var(--coral);
  background: var(--night);
}

.page-about .about-aside h3 {
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: var(--t14);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--coral);
}

.page-about .about-aside p {
  margin: 0 0 0.9rem;
  font-size: var(--t14);
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-aside p:last-child {
  margin-bottom: 0;
}

/* ---------- 使用范围 ---------- */
.page-about .about-scope {
  display: grid;
  gap: 2px;
  border: 2px solid var(--line);
  background: var(--line);
}

.page-about .about-scope__col {
  padding: 1.5rem 1.25rem;
  background: var(--night);
}

.page-about .about-scope__col h3 {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: var(--t14);
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--neon);
}

.page-about .about-scope__col--no h3 {
  color: var(--coral);
}

.page-about .about-scope__col ul {
  display: grid;
  gap: 0.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-scope__col li {
  position: relative;
  padding-left: 1.35rem;
  font-size: var(--t14);
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-scope__col li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 10px;
  height: 2px;
  background: var(--neon);
}

.page-about .about-scope__col--no li::before {
  background: var(--coral);
}

/* ---------- 章节目录 ---------- */
.page-about .chapter-rail {
  display: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about {
    --about-gap: 4.5rem;
  }

  .page-about .about-hero {
    padding: 2.5rem 0 4.5rem;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: end;
    gap: 3rem;
  }

  .page-about .about-hero__fig {
    align-self: stretch;
  }

  .page-about .about-hero__fig img {
    height: 100%;
  }

  .page-about .about-grid2 {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.85fr);
    gap: 3rem;
  }

  .page-about .about-produce__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 2.5rem;
    align-items: start;
  }

  .page-about .about-fix__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.85fr);
    gap: 3rem;
  }

  /* 横向版本时间轴 */
  .page-about .about-axis {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.5rem;
    padding: 2.5rem 0 0;
  }

  .page-about .about-axis::before {
    left: 0;
    right: 0;
    top: 5px;
    bottom: auto;
    width: auto;
    height: 2px;
  }

  .page-about .about-axis__item {
    padding-bottom: 0;
  }

  .page-about .about-axis__item::before {
    left: 0;
    top: -2.5rem;
  }
}

@media (min-width: 1080px) {
  .page-about .chapter-rail {
    position: fixed;
    top: 50%;
    right: 1.5rem;
    z-index: 20;
    display: flex;
    flex-direction: column;
    gap: 2px;
    transform: translateY(-50%);
  }

  .page-about .chapter-rail__link {
    padding: 0.4rem 0.75rem;
    border: 1px solid transparent;
    border-radius: var(--pill);
    background: rgba(10, 23, 41, 0.85);
    font-family: var(--font-mono);
    font-size: var(--t12);
    letter-spacing: 0.06em;
    color: var(--muted);
    text-decoration: none;
    transition: color var(--dur-hover) linear, border-color var(--dur-hover) linear;
  }

  .page-about .chapter-rail__link:hover,
  .page-about .chapter-rail__link:focus-visible {
    color: var(--neon);
    border-color: var(--neon);
  }

  .page-about .chapter-rail__link[aria-current="true"] {
    color: var(--ink);
    background: var(--neon);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}