.page-about {
  --ab-body: 40rem;
  --ab-aside: 15rem;
  padding-bottom: 4rem;
}

.page-about .breadcrumbs {
  margin-top: 1.5rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 1.5rem 0 3rem;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 2.5rem;
}

.page-about .about-hero__lead .eyebrow {
  margin-bottom: 1rem;
}

.page-about .about-hero__lead h1 {
  margin: 0 0 1.25rem;
}

.page-about .about-hero__lead .serif-lede {
  max-width: 34rem;
  margin: 0;
}

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

.page-about .fact {
  background: var(--teal);
  padding: 1.05rem 1.1rem 1.2rem;
}

.page-about .fact__v {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--lime);
}

.page-about .fact__k {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.78rem;
  line-height: 1.55;
  color: var(--silver);
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  padding: 2.75rem 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .chapter__head {
  margin-bottom: 1.5rem;
}

.page-about .chapter__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--silver);
  opacity: 0.34;
}

.page-about .chapter__title {
  margin: 0.6rem 0 0;
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 500;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .chapter__body {
  display: grid;
  gap: 2.25rem;
  min-width: 0;
}

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

.page-about .chapter__main > p {
  max-width: var(--ab-body);
  margin: 0 0 1.15rem;
  font-size: 1rem;
  line-height: 1.78;
  color: rgba(242, 245, 239, 0.85);
}

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

.page-about .chapter__main a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 255, 61, 0.4);
  padding-bottom: 1px;
}

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

.page-about .chapter__sub {
  max-width: var(--ab-body);
  margin: 2rem 0 0.9rem;
  font-family: var(--font-body);
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .chapter__after {
  margin-top: 1.75rem !important;
}

.page-about .keyline {
  border-bottom: 2px solid var(--lime);
  padding-bottom: 1px;
  color: var(--paper);
  font-weight: 600;
}

/* ---------- 旁注定义卡 ---------- */
.page-about .chapter__aside {
  min-width: 0;
}

.page-about .defcard {
  border: 1px solid rgba(198, 255, 61, 0.42);
  background: rgba(198, 255, 61, 0.05);
  border-radius: var(--r-m);
  padding: 1.05rem 1.15rem;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.page-about .defcard + .defcard {
  margin-top: 1rem;
}

.page-about .defcard:hover,
.page-about .defcard:focus-within {
  transform: translateY(-2px);
  box-shadow: var(--shadow-soft);
  border-color: rgba(198, 255, 61, 0.8);
}

.page-about .defcard__k {
  display: block;
  margin-bottom: 0.45rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--lime);
}

.page-about .defcard__v {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: rgba(242, 245, 239, 0.8);
}

/* ---------- 团队分工列表 ---------- */
.page-about .roles {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .roles li {
  display: grid;
  grid-template-columns: 2.75rem minmax(0, 1fr);
  gap: 0.3rem 1.1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .role__n {
  grid-row: span 2;
  align-self: start;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--lime);
}

.page-about .role__t {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .role__d {
  font-size: 0.9rem;
  line-height: 1.68;
  color: rgba(242, 245, 239, 0.66);
}

/* ---------- 图片 ---------- */
.page-about .shot {
  margin: 2.25rem 0 0;
  max-width: 46rem;
}

.page-about .shot__frame {
  border-radius: var(--r-l);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: linear-gradient(155deg, rgba(18, 48, 40, 0.95), rgba(11, 31, 26, 0.95));
}

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

.page-about .shot--3x2 .shot__frame {
  aspect-ratio: 3 / 2;
}

.page-about .shot--4x3 .shot__frame {
  aspect-ratio: 4 / 3;
}

.page-about .shot--4x5 .shot__frame {
  aspect-ratio: 4 / 5;
}

.page-about .shot figcaption {
  margin-top: 0.7rem;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--olive);
}

/* ---------- 对比基准确表 ---------- */
.page-about .table-scroll {
  margin-top: 1.75rem;
  border-radius: var(--r-m);
  border: 1px solid var(--line);
  background: rgba(22, 26, 56, 0.45);
}

.page-about .cmp {
  width: 100%;
  min-width: 34rem;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.page-about .cmp th,
.page-about .cmp td {
  padding: 0.85rem 1.05rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.page-about .cmp thead th {
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--silver);
  white-space: nowrap;
}

.page-about .cmp tbody tr:last-child th,
.page-about .cmp tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .cmp td {
  line-height: 1.68;
  color: rgba(242, 245, 239, 0.78);
}

.page-about .cmp td:first-child {
  font-weight: 600;
  color: var(--paper);
  white-space: nowrap;
}

.page-about .cmp tbody tr:hover td {
  background: rgba(198, 255, 61, 0.045);
}

/* ---------- 校对流程 ---------- */
.page-about .steps {
  list-style: none;
  counter-reset: st;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.35rem;
  max-width: var(--ab-body);
}

.page-about .steps li {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr);
  gap: 0.4rem 1rem;
  align-items: start;
}

.page-about .steps li::before {
  counter-increment: st;
  content: counter(st, decimal-leading-zero);
  display: grid;
  place-items: center;
  height: 1.6rem;
  border-radius: var(--r-pill);
  background: rgba(198, 255, 61, 0.08);
  border: 1px solid rgba(198, 255, 61, 0.45);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--lime);
}

.page-about .steps li strong {
  font-size: 0.98rem;
  font-weight: 700;
  line-height: 1.6;
  color: var(--paper);
}

.page-about .steps li p {
  grid-column: 2;
  margin: 0.2rem 0 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(242, 245, 239, 0.7);
}

/* ---------- 时间线 ---------- */
.page-about .tl {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0 0 0 0.35rem;
}

.page-about .tl__item {
  position: relative;
  padding: 0 0 2rem 1.6rem;
  margin-left: 4px;
  border-left: 1px solid var(--line);
  transition: transform 0.25s ease;
}

.page-about .tl__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .tl__dot {
  position: absolute;
  left: -5px;
  top: 0.3rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(198, 255, 61, 0.12);
}

.page-about .tl__ver {
  display: inline-block;
  padding: 0.18rem 0.6rem;
  border-radius: var(--r-pill);
  background: rgba(198, 255, 61, 0.1);
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .tl__year {
  display: block;
  margin: 0.6rem 0 0.35rem;
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
}

.page-about .tl__text {
  margin: 0;
  max-width: 22rem;
  font-size: 0.92rem;
  line-height: 1.65;
  color: rgba(242, 245, 239, 0.8);
}

.page-about .tl__note {
  margin: 0.5rem 0 0;
  max-width: 21rem;
  font-size: 0.82rem;
  line-height: 1.62;
  color: rgba(201, 209, 204, 0.55);
  transition: color 0.25s ease, opacity 0.25s ease;
}

/* ---------- 大屏 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 3rem 0 4.5rem;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    column-gap: 3rem;
    align-items: end;
  }

  .page-about .fact__v {
    font-size: 1.9rem;
  }

  .page-about .chapter {
    display: grid;
    grid-template-columns: 12.5rem minmax(0, 1fr);
    column-gap: 3rem;
    padding: 4rem 0;
  }

  .page-about .chapter__head {
    position: sticky;
    top: 5.5rem;
    align-self: start;
    margin-bottom: 0;
  }

  .page-about .chapter__num {
    font-size: 3rem;
  }

  .page-about .chapter__title {
    font-size: 1.4rem;
  }

  .page-about .tl {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    padding: 2.5rem 0 0;
  }

  .page-about .tl__item {
    padding: 1.6rem 1.75rem 0 0;
    margin-left: 0;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .page-about .tl__item:hover {
    transform: translateY(-2px);
  }

  .page-about .tl__item:hover .tl__note {
    color: rgba(198, 255, 61, 0.85);
  }

  .page-about .tl__dot {
    left: 0;
    top: -5px;
    width: 9px;
    height: 9px;
  }

  .page-about .tl__text {
    max-width: none;
  }

  .page-about .tl__note {
    max-width: none;
  }
}

@media (min-width: 1100px) {
  .page-about .chapter__body--aside {
    grid-template-columns: minmax(0, 1fr) var(--ab-aside);
    column-gap: 2.75rem;
    align-items: start;
  }

  .page-about .defcard + .defcard {
    margin-top: 1.15rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .defcard,
  .page-about .tl__item,
  .page-about .tl__note {
    transition: none;
  }

  .page-about .defcard:hover,
  .page-about .defcard:focus-within,
  .page-about .tl__item:hover {
    transform: none;
  }
}