.page-about {
  --about-rail: 42px;
  --about-hair: 1px solid var(--line-soft);
}

.page-about .about-wrap {
  padding-block: 0 72px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  padding-block: 22px 0;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .breadcrumbs a {
  color: var(--signal);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  text-decoration: underline;
}

.page-about .breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  color: var(--line);
  margin-right: 10px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: 30px 46px;
  border-bottom: var(--edge);
}

.page-about .about-hero__kicker {
  margin: 0 0 18px;
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--signal);
}

.page-about .about-hero__title {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(42px, 12.5vw, 100px);
  line-height: 0.96;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--signal);
}

.page-about .about-hero__lede {
  max-width: 62ch;
  margin: 0;
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: var(--edge);
}

.page-about .about-figures__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 14px 16px;
  background: var(--ink-2);
}

.page-about .about-figures__num {
  font-family: var(--font-num);
  font-size: 25px;
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-figures__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  column-gap: 14px;
  padding-block: 40px 46px;
  border-top: var(--about-hair);
}

.page-about .about-sec--last {
  border-bottom: var(--about-hair);
}

.page-about .about-sec__rail {
  grid-column: 1;
}

.page-about .about-sec__num {
  display: block;
  padding-top: 2px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 9vw, 54px);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--line);
}

.page-about .about-sec__body {
  grid-column: 2;
  min-width: 0;
}

.page-about .about-sec__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 6vw, 38px);
  line-height: 1.14;
  letter-spacing: -0.005em;
  color: var(--paper);
}

.page-about .about-sec__body > p {
  max-width: 66ch;
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-sec__aside {
  max-width: 66ch;
  margin: 22px 0 0;
  padding: 14px 0 14px 16px;
  border-left: 2px solid var(--signal);
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-inline-link {
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 240, 181, 0.45);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ---------- 图片 ---------- */
.page-about .about-media {
  margin: 26px 0 0;
  padding: 0;
  overflow: hidden;
  background: var(--ink-3);
  border: var(--edge);
  box-shadow: var(--shadow-hard);
}

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

/* ---------- 三条主线 ---------- */
.page-about .about-lanes {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .lane {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px 18px 20px;
  background: var(--ink-2);
  border: var(--edge);
  box-shadow: var(--shadow-hard);
  transition: transform 140ms ease, box-shadow 140ms ease;
}

.page-about .lane--amber {
  box-shadow: var(--shadow-amber);
}

.page-about .lane:hover {
  transform: translate(-2px, -2px);
}

.page-about .lane__tag {
  align-self: flex-start;
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--signal);
}

.page-about .lane__tag.tag--amber {
  color: var(--amber);
}

.page-about .lane__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 24px;
  line-height: 1.2;
  color: var(--paper);
}

.page-about .lane__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .lane__link {
  margin-top: auto;
  padding-top: 4px;
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--signal);
  text-decoration: none;
}

.page-about .lane__link::after {
  content: " →";
}

.page-about .lane__link:hover,
.page-about .lane__link:focus-visible {
  color: var(--paper);
}

/* ---------- 检索路径 ---------- */
.page-about .about-paths {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.page-about .path {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 16px 18px;
  background: var(--ink-3);
  border-left: 3px solid var(--amber);
}

.page-about .path__index {
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--amber);
}

.page-about .path__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  line-height: 1.2;
  color: var(--paper);
}

.page-about .path__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .path__hint {
  margin-top: auto;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--signal-deep);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 28px 0 0;
  padding: 0 0 0 28px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--amber) 0%, var(--line) 78%);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 30px;
}

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

.page-about .about-timeline__dot {
  position: absolute;
  left: -28px;
  top: 6px;
  width: 16px;
  height: 16px;
  background: var(--ink);
  border: 2px solid var(--amber);
}

.page-about .about-timeline__year {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  line-height: 1.24;
  color: var(--paper);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 团队分工 ---------- */
.page-about .about-roles {
  display: grid;
  gap: 1px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: var(--edge);
}

.page-about .about-roles__item {
  padding: 18px 16px 20px;
  background: var(--ink-2);
}

.page-about .about-roles__num {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--signal);
}

.page-about .about-roles__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  line-height: 1.2;
  color: var(--paper);
}

.page-about .about-roles__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 结尾 CTA ---------- */
.page-about .about-cta {
  margin-top: 32px;
  padding: 22px 18px 24px;
  background: var(--ink-3);
  border: var(--edge);
  box-shadow: var(--shadow-signal);
}

.page-about .about-cta__text {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 21px;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

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

  .page-about .about-figures__num {
    font-size: 30px;
  }

  .page-about .about-cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding: 24px 26px;
  }

  .page-about .about-cta__text {
    margin: 0;
    max-width: 40ch;
  }
}

@media (min-width: 780px) {
  .page-about .about-lanes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about {
    --about-rail: 118px;
  }

  .page-about .about-wrap {
    padding-block: 0 96px;
  }

  .page-about .about-hero {
    padding-block: 44px 62px;
  }

  .page-about .about-sec {
    column-gap: 28px;
    padding-block: 62px 70px;
  }

  .page-about .about-sec__num {
    position: sticky;
    top: 34px;
  }

  .page-about .about-sec__body > p {
    font-size: 17px;
  }

  .page-about .about-timeline__title,
  .page-about .about-roles__title,
  .page-about .path__title {
    font-size: 24px;
  }

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

  .page-about .about-media--archive {
    margin-top: 30px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .lane,
  .page-about .lane:hover {
    transition: none;
    transform: none;
  }
}