.page-about {
  --about-toc-w: 232px;
  --about-gap: clamp(32px, 5vw, 72px);
  position: relative;
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-block: 20px 4px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(28px, 5vw, 64px) clamp(36px, 6vw, 76px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 56px);
  align-items: center;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 16px;
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--amber);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-narrow);
  font-size: clamp(34px, 7vw, 62px);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -.01em;
  color: var(--mist-white);
}

.page-about .about-hero__intro {
  margin: 0 0 28px;
  max-width: 34em;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.78;
  color: var(--neutral-blue);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
}

.page-about .about-hero__media::before {
  content: "";
  position: absolute;
  inset: 22px -16px -22px 22px;
  background: linear-gradient(140deg, var(--signal-orange), rgba(23, 224, 200, .55));
  clip-path: polygon(0 0, 100% 6%, 92% 100%, 6% 94%);
  opacity: .85;
  border-radius: var(--radius-l);
}

.page-about .about-hero__media img {
  position: relative;
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  border-radius: var(--radius-l);
  border: 1px solid var(--edge-blue);
  box-shadow: var(--shadow-float);
}

/* ---------- 数字带 ---------- */
.page-about .about-figures {
  padding-block: clamp(28px, 4vw, 44px);
  background: linear-gradient(180deg, rgba(18, 38, 63, .85), rgba(11, 26, 46, 0));
  border-top: 1px solid var(--edge-blue);
  border-bottom: 1px solid var(--edge-blue);
}

.page-about .about-figures__row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 20px;
}

.page-about .about-figure {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-left: 14px;
  border-left: 3px solid var(--edge-blue);
}

.page-about .about-figure:nth-child(1) { border-left-color: var(--signal-orange); }
.page-about .about-figure:nth-child(2) { border-left-color: var(--amber); }
.page-about .about-figure:nth-child(3) { border-left-color: var(--neon-cyan); }
.page-about .about-figure:nth-child(4) { border-left-color: var(--neutral-blue); }

.page-about .about-figure__num {
  font-family: var(--font-narrow);
  font-size: clamp(34px, 5vw, 52px);
  font-weight: 700;
  line-height: 1;
  color: var(--mist-white);
}

.page-about .about-figure__unit {
  font-size: 13px;
  color: var(--amber);
}

.page-about .about-figure__label {
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--neutral-blue);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
  padding-block: clamp(40px, 6vw, 84px) clamp(48px, 7vw, 96px);
}

/* ---------- 目录 ---------- */
.page-about .about-toc {
  border: 1px solid var(--edge-blue);
  border-radius: var(--radius-m);
  background: var(--steel-blue);
  padding: 16px 18px;
}

.page-about .about-toc__title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--neutral-blue);
  text-transform: uppercase;
}

.page-about .about-toc__list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc__list li {
  flex: 0 0 auto;
}

.page-about .about-toc .toc__link {
  display: block;
  white-space: nowrap;
  font-size: 13px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--edge-blue);
  color: var(--neutral-blue);
  text-decoration: none;
}

.page-about .about-toc .toc__link[aria-current="true"] {
  border-color: var(--signal-orange);
  background: rgba(255, 106, 31, .14);
  color: var(--mist-white);
}

/* ---------- 章节 ---------- */
.page-about .about-sections {
  display: flex;
  flex-direction: column;
  gap: clamp(48px, 7vw, 96px);
  min-width: 0;
}

.page-about .about-section {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-section .prose {
  max-width: 36em;
}

.page-about .about-section .prose + .prose {
  margin-top: 14px;
}

.page-about .about-section .prose a {
  color: var(--neon-cyan);
  text-underline-offset: 3px;
}

/* ---------- 班组三卡 ---------- */
.page-about .about-crew {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 28px;
}

.page-about .about-crew__card {
  position: relative;
  padding: 24px 20px 22px;
  border-radius: var(--radius-m);
  background: var(--steel-blue);
  border: 1px solid var(--edge-blue);
  border-top-width: 4px;
}

.page-about .about-crew__card--edit { border-top-color: var(--signal-orange); }
.page-about .about-crew__card--tech { border-top-color: var(--neon-cyan); }
.page-about .about-crew__card--ops  { border-top-color: var(--neutral-blue); }

.page-about .about-crew__count {
  margin: 0;
  font-size: 42px;
  font-weight: 700;
  line-height: 1;
  color: var(--mist-white);
}

.page-about .about-crew__card--edit .about-crew__count { color: var(--signal-orange); }
.page-about .about-crew__card--tech .about-crew__count { color: var(--neon-cyan); }
.page-about .about-crew__card--ops  .about-crew__count { color: var(--neutral-blue); }

.page-about .about-crew__name {
  margin: 10px 0 8px;
  font-family: var(--font-narrow);
  font-size: 22px;
  font-weight: 700;
  color: var(--mist-white);
}

.page-about .about-crew__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--neutral-blue);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline-media {
  margin: 26px 0 22px;
}

.page-about .about-timeline-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border-radius: var(--radius-m);
  border: 1px solid var(--edge-blue);
  filter: saturate(.85);
}

.page-about .about-timeline {
  overflow-x: auto;
  padding-bottom: 14px;
  scroll-snap-type: x proximity;
  background-image: repeating-linear-gradient(
    90deg,
    var(--edge-blue) 0,
    var(--edge-blue) 1px,
    transparent 1px,
    transparent 44px
  );
  background-position: left bottom;
  background-size: 100% 10px;
  background-repeat: no-repeat;
}

.page-about .about-timeline:focus-visible {
  outline: 2px solid var(--neon-cyan);
  outline-offset: 4px;
  border-radius: var(--radius-s);
}

.page-about .about-timeline__track {
  display: flex;
  gap: 14px;
  margin: 0;
  padding: 6px 2px 16px;
  list-style: none;
}

.page-about .about-timeline__item {
  flex: 0 0 78%;
  scroll-snap-align: start;
  padding: 20px 18px 22px;
  border-radius: var(--radius-m);
  background: var(--steel-blue);
  border: 1px solid var(--edge-blue);
  border-left: 3px solid var(--amber);
}

.page-about .about-timeline__item:nth-child(4) { border-left-color: var(--neon-cyan); }
.page-about .about-timeline__item:nth-child(5) { border-left-color: var(--signal-orange); }
.page-about .about-timeline__item:nth-child(6) { border-left-color: var(--neutral-blue); }

.page-about .about-timeline__year {
  margin: 0;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--amber);
}

.page-about .about-timeline__title {
  margin: 10px 0 8px;
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  color: var(--mist-white);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--neutral-blue);
}

/* ---------- 工序 ---------- */
.page-about .about-flow-media {
  margin: 26px 0 24px;
}

.page-about .about-flow-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border-radius: var(--radius-m);
  border: 1px solid var(--edge-blue);
}

.page-about .about-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.page-about .about-flow__step {
  position: relative;
  padding: 20px 18px 20px 22px;
  border-radius: var(--radius-m);
  background: rgba(18, 38, 63, .7);
  border: 1px solid var(--edge-blue);
  overflow: hidden;
}

.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: linear-gradient(180deg, var(--signal-orange), var(--amber));
}

.page-about .about-flow__step:nth-child(2)::before { background: linear-gradient(180deg, var(--amber), var(--neon-cyan)); }
.page-about .about-flow__step:nth-child(3)::before { background: linear-gradient(180deg, var(--neon-cyan), var(--neutral-blue)); }
.page-about .about-flow__step:nth-child(4)::before { background: linear-gradient(180deg, var(--neutral-blue), var(--edge-blue)); }
.page-about .about-flow__step:nth-child(5)::before { background: linear-gradient(180deg, var(--edge-blue), var(--charcoal)); }

.page-about .about-flow__no {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 10px;
  font-size: 13px;
  border-radius: 999px;
  background: rgba(255, 181, 71, .14);
  color: var(--amber);
}

.page-about .about-flow__name {
  margin: 0 0 6px;
  font-family: var(--font-narrow);
  font-size: 19px;
  font-weight: 700;
  color: var(--mist-white);
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--neutral-blue);
}

/* ---------- 主题带 ---------- */
.page-about .theme-band {
  margin-top: 26px;
  padding: 18px 20px;
  border-radius: 0 var(--radius-m) var(--radius-m) 0;
  background: linear-gradient(90deg, rgba(23, 224, 200, .14), rgba(11, 26, 46, 0));
}

.page-about .theme-band__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist-white);
}

.page-about .theme-band__text a {
  color: var(--neon-cyan);
  text-underline-offset: 3px;
}

/* ---------- 信条 ---------- */
.page-about .about-creed {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 28px;
}

.page-about .about-creed__item {
  padding: 20px;
  border-radius: var(--radius-m);
  background: var(--steel-blue);
  border: 1px dashed var(--edge-blue);
}

.page-about .about-creed__tag {
  display: inline-block;
  margin: 0 0 12px;
  font-size: 12px;
  padding: 5px 12px;
}

.page-about .about-creed__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist-white);
}

/* ---------- 入口列表 ---------- */
.page-about .about-entries {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-entry {
  display: grid;
  gap: 6px;
  padding: 20px;
  border-radius: var(--radius-m);
  background: var(--steel-blue);
  border: 1px solid var(--edge-blue);
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-entry:hover,
.page-about .about-entry:focus-visible {
  border-color: var(--signal-orange);
  transform: translateY(-2px);
}

.page-about .about-entry__kicker {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--neutral-blue);
  text-transform: uppercase;
}

.page-about .about-entry__name {
  font-family: var(--font-narrow);
  font-size: 22px;
  font-weight: 700;
  color: var(--mist-white);
}

.page-about .about-entry__desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--neutral-blue);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-figures__row {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }

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

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

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

  .page-about .about-timeline__item {
    flex-basis: 42%;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: 5fr 7fr;
    gap: clamp(40px, 5vw, 72px);
  }

  .page-about .about-hero__media {
    transform: translateY(-8px);
  }

  .page-about .about-body {
    grid-template-columns: var(--about-toc-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    padding: 20px 18px;
  }

  .page-about .about-toc__list {
    display: block;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-toc__list li + li {
    margin-top: 6px;
  }

  .page-about .about-toc .toc__link {
    white-space: normal;
    font-size: 14px;
    padding: 9px 12px;
    border-radius: var(--radius-s);
    border-color: transparent;
  }

  .page-about .about-toc .toc__link:hover {
    border-color: var(--edge-blue);
    color: var(--mist-white);
  }

  .page-about .about-flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-timeline__item {
    flex-basis: 30%;
  }
}

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

  .page-about .about-entry:hover,
  .page-about .about-entry:focus-visible {
    transform: none;
  }
}