.page-about {
  --ab-line: rgba(185, 196, 206, 0.15);
  --ab-soft: rgba(16, 42, 67, 0.55);
  --ab-graphite-line: rgba(22, 27, 34, 0.14);
  background: var(--deep);
  color: var(--ink);
  font-family: var(--font-sans);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: 2rem 2.5rem;
  border-bottom: 1px solid var(--ab-line);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    repeating-linear-gradient(115deg, rgba(79, 209, 197, 0.05) 0 1px, transparent 1px 24px),
    radial-gradient(120% 90% at 100% 0%, rgba(255, 107, 26, 0.14), transparent 62%);
}
.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: 1.75rem;
  align-items: center;
}
.page-about .about-hero__copy .breadcrumb {
  margin-bottom: 0.9rem;
  font-size: 0.78rem;
  color: var(--silver-dim);
}
.page-about .about-hero__copy .breadcrumb a {
  color: var(--silver-dim);
  text-decoration: none;
}
.page-about .about-hero__copy .breadcrumb a:hover {
  color: var(--orange);
}
.page-about .about-hero__copy .display {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 6.4vw, 3.2rem);
  line-height: 1.16;
  letter-spacing: -0.005em;
  color: var(--mist);
  margin: 0.35rem 0 1rem;
}
.page-about .about-hero__copy .lead {
  max-width: 34rem;
  font-size: 0.98rem;
  line-height: 1.78;
  color: var(--silver);
  margin: 0 0 1.4rem;
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}
.page-about .about-hero__visual {
  border: 1px solid var(--ab-line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(16, 42, 67, 0.92), rgba(8, 19, 31, 0.94));
  padding: 0.85rem;
  box-shadow: var(--shadow-float);
}
.page-about .about-hero__visual svg {
  display: block;
  width: 100%;
  height: auto;
}
.page-about .about-hero__badge {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin: 0.8rem 0 0;
  padding-top: 0.7rem;
  border-top: 1px solid var(--ab-line);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--silver-dim);
}

/* ---------- 章节索引 ---------- */
.page-about .about-indexbar {
  position: sticky;
  top: 0;
  z-index: 6;
  background: rgba(8, 19, 31, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--ab-line);
}
.page-about .chapter-index {
  display: flex;
  gap: 0.4rem;
  overflow-x: auto;
  padding-block: 0.65rem;
  scrollbar-width: none;
}
.page-about .chapter-index::-webkit-scrollbar {
  display: none;
}
.page-about .chapter-link {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--silver-dim);
  text-decoration: none;
  padding: 0.34rem 0.7rem;
  border: 1px solid var(--ab-line);
  border-radius: 999px;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.page-about .chapter-link:hover {
  color: var(--mist);
  border-color: var(--silver);
}
.page-about .chapter-link[aria-current="true"] {
  color: var(--deep);
  background: var(--orange);
  border-color: var(--orange);
}

/* ---------- 区块骨架 ---------- */
.page-about .about-block {
  padding-block: 2.5rem;
  border-top: 1px solid var(--ab-line);
}
.page-about .about-block:first-of-type {
  border-top: 0;
}
.page-about .about-title {
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(1.35rem, 4vw, 1.8rem);
  line-height: 1.32;
  letter-spacing: 0.01em;
  color: var(--mist);
  margin: 0.3rem 0 0.8rem;
}
.page-about .about-lede {
  max-width: 34rem;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--silver-dim);
  margin: 0 0 1.1rem;
}
.page-about .about-text p {
  max-width: 36rem;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--ink);
  margin: 0 0 0.95rem;
}
.page-about .about-text p:last-child {
  margin-bottom: 0;
}
.page-about .about-split {
  display: grid;
  gap: 1rem;
}
.page-about .about-split--crew {
  gap: 1.9rem;
}

/* ---------- 团队 ---------- */
.page-about .crew {
  list-style: none;
  margin: 1.2rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.95rem;
  max-width: 36rem;
}
.page-about .crew li {
  padding-left: 0.85rem;
  border-left: 1px solid var(--ab-line);
}
.page-about .crew__name {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--orange);
  margin-bottom: 0.28rem;
}
.page-about .crew p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--silver);
}
.page-about .about-quote {
  margin: 1.4rem 0 0;
  padding: 0.9rem 1.1rem;
  border-left: 2px solid var(--orange);
  background: var(--ab-soft);
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--silver);
  max-width: 34rem;
}

/* ---------- 图片 ---------- */
.page-about .about-shot {
  margin: 0;
  border: 1px solid var(--ab-line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--tactic);
}
.page-about .about-shot img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-shot figcaption {
  padding: 0.6rem 0.85rem;
  border-top: 1px solid var(--ab-line);
  font-size: 0.76rem;
  line-height: 1.6;
  color: var(--silver-dim);
}
.page-about .about-shot--wide img {
  aspect-ratio: 16 / 6;
}
.page-about .about-shot--sq {
  max-width: 220px;
}

/* ---------- 工序带 ---------- */
.page-about .relay-layout {
  display: grid;
  gap: 1.6rem;
  align-items: start;
}
.page-about .relay-aside__note {
  margin: 0.7rem 0 0;
  max-width: 220px;
  font-size: 0.76rem;
  line-height: 1.65;
  color: var(--silver-dim);
}
.page-about .relay {
  list-style: none;
  margin: 1.4rem 0 0;
  padding: 0 0 0 1.75rem;
  position: relative;
}
.page-about .relay::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 0.5rem;
  bottom: 1.6rem;
  width: 1px;
  background: linear-gradient(180deg, var(--orange), rgba(185, 196, 206, 0.35) 45%, var(--ab-line));
}
.page-about .relay__item {
  position: relative;
  padding-bottom: 1.6rem;
}
.page-about .relay__item:last-child {
  padding-bottom: 0;
}
.page-about .relay__dot {
  position: absolute;
  left: -1.75rem;
  top: 0.4rem;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--silver);
  background: var(--deep);
  transition: background 0.45s ease, border-color 0.45s ease, box-shadow 0.45s ease;
}
.page-about .relay__item.is-inview .relay__dot {
  background: var(--orange);
  border-color: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 26, 0.16);
}
.page-about .relay__when {
  margin: 0 0 0.2rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--silver-dim);
}
.page-about .relay__title {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
  font-weight: 800;
  line-height: 1.4;
  color: var(--mist);
}
.page-about .relay__body p {
  margin: 0 0 0.4rem;
  max-width: 33rem;
  font-size: 0.93rem;
  line-height: 1.75;
  color: var(--ink);
}
.page-about .relay__body .relay__span {
  margin: 0;
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: var(--cyan);
  border: 1px solid rgba(79, 209, 197, 0.28);
  border-radius: 999px;
  padding: 0.14rem 0.55rem;
}

/* ---------- 数字带（浅色分区） ---------- */
.page-about .about-mist {
  background: var(--mist);
  color: var(--graphite);
  padding-block: 2.2rem;
  margin-top: 1.8rem;
}
.page-about .about-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ab-graphite-line);
  border: 1px solid var(--ab-graphite-line);
}
.page-about .band-stat {
  background: var(--mist);
  padding: 1rem 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
.page-about .band-stat__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.85rem, 7vw, 3rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--graphite);
  font-variant-numeric: tabular-nums;
}
.page-about .band-stat__unit {
  font-size: 0.46em;
  font-weight: 600;
  margin-left: 0.12em;
  color: var(--lava);
}
.page-about .band-stat__label {
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--grey);
}
.page-about .mist-copy {
  margin-top: 1.6rem;
}
.page-about .mist-copy p {
  max-width: 40rem;
  margin: 0 0 0.9rem;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--graphite);
}
.page-about .mist-copy p:last-child {
  margin-bottom: 0;
}

/* ---------- 历程 ---------- */
.page-about .route {
  list-style: none;
  margin: 1.3rem 0 0;
  padding: 0;
}
.page-about .route__item {
  display: grid;
  gap: 0.25rem;
  padding: 1rem 0;
  border-top: 1px solid var(--ab-line);
}
.page-about .route__item:last-child {
  border-bottom: 1px solid var(--ab-line);
}
.page-about .route__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  color: var(--orange);
}
.page-about .route__body h3 {
  margin: 0 0 0.3rem;
  font-size: 1rem;
  font-weight: 800;
  color: var(--mist);
}
.page-about .route__body p {
  margin: 0;
  max-width: 36rem;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--silver-dim);
}

/* ---------- 准则 ---------- */
.page-about .creed {
  list-style: none;
  margin: 1.4rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.4rem;
}
.page-about .creed li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.85rem;
  align-items: start;
}
.page-about .creed__no {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.55rem;
  line-height: 1;
  color: var(--orange);
}
.page-about .creed h3 {
  margin: 0 0 0.32rem;
  font-size: 1rem;
  font-weight: 800;
  color: var(--mist);
}
.page-about .creed p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--silver-dim);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  display: grid;
  gap: 1px;
  margin-top: 2rem;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}
.page-about .about-next__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.95rem 1.1rem;
  background: var(--tactic);
  color: var(--mist);
  text-decoration: none;
  font-size: 0.94rem;
  transition: background 0.22s ease, color 0.22s ease;
}
.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: var(--orange);
  color: var(--deep);
}
.page-about .about-next__arrow {
  font-family: var(--font-mono);
  font-size: 1rem;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding-block: 2.5rem 3rem;
  }
  .page-about .about-shot--sq {
    max-width: 260px;
  }
  .page-about .about-next {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-block {
    padding-block: 3.25rem;
  }
  .page-about .about-mist {
    padding-block: 2.75rem;
  }
  .page-about .about-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .band-stat {
    padding: 1.3rem 1.15rem;
  }
  .page-about .creed {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.7rem 2.6rem;
  }
  .page-about .route__item {
    grid-template-columns: 96px minmax(0, 1fr);
    align-items: start;
    gap: 0.3rem 1.2rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    gap: 2.6rem;
  }
  .page-about .about-split {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: 2.6rem;
    align-items: start;
  }
  .page-about .about-split--crew {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    gap: 2.4rem;
  }
  .page-about .relay-layout {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 2.8rem;
  }
  .page-about .relay-aside {
    position: sticky;
    top: 4.5rem;
  }
  .page-about .relay-aside__note {
    max-width: 240px;
  }
  .page-about .about-band {
    border-left: 0;
    border-right: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .relay__dot,
  .page-about .chapter-link,
  .page-about .about-next__link {
    transition: none;
  }
}