.page-about {
  --about-edge: rgba(233, 180, 76, 0.26);
  --about-edge-soft: rgba(233, 180, 76, 0.14);
  --about-line: rgba(247, 241, 227, 0.1);
  --about-text: rgba(247, 241, 227, 0.82);
  --about-dim: rgba(247, 241, 227, 0.62);
  background: var(--ink);
  color: var(--cream);
  padding-bottom: 72px;
  overflow-x: clip;
}

.page-about a {
  color: var(--red-bright);
}

/* ---------- 卷首 ---------- */

.page-about .about-lede {
  position: relative;
  padding-block: 40px 12px;
}

.page-about .about-lede::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -8%;
  left: 34%;
  height: 460px;
  background:
    radial-gradient(circle at 68% 34%, rgba(217, 71, 56, 0.3), transparent 62%),
    radial-gradient(circle at 26% 74%, rgba(47, 183, 168, 0.14), transparent 58%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-lede .container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero {
  display: grid;
  gap: 28px;
  margin-top: 22px;
}

.page-about .about-hero__title,
.page-about h1 {
  font-family: var(--font-display);
  font-size: clamp(30px, 5.2vw, 54px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.02em;
  margin: 14px 0 0;
  color: var(--cream);
  max-width: 15em;
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--about-text);
  max-width: 34em;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 4px;
  padding: 18px 16px;
  border: 1px solid var(--about-edge);
  border-radius: var(--radius-md);
  background: linear-gradient(160deg, rgba(23, 58, 94, 0.6), rgba(11, 16, 38, 0.18));
}

.page-about .about-stat {
  padding-inline: 4px;
  border-left: 1px solid var(--about-edge-soft);
}

.page-about .about-stat:first-child {
  border-left: 0;
  padding-left: 0;
}

.page-about .about-stat__num {
  display: block;
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--mauve);
  letter-spacing: 0.02em;
}

.page-about .about-hero__figure {
  margin: 34px 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--about-edge);
}

.page-about .media-frame {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

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

.page-about .media-frame__caption {
  padding: 10px 14px;
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--mauve);
  background: rgba(11, 16, 38, 0.6);
}

/* ---------- 双栏主体 ---------- */

.page-about .about-body {
  margin-top: 6px;
  padding-top: 44px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-body__grid {
  display: grid;
  gap: 30px;
}

/* 移动端横向 scroll-snap 年表 */
.page-about .about-rail {
  position: relative;
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 10px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__item {
  flex: 0 0 auto;
  scroll-snap-align: start;
}

.page-about .about-rail__link {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 16px;
  border: 1px solid var(--about-edge-soft);
  border-radius: var(--radius-pill);
  background: rgba(23, 58, 94, 0.4);
  color: var(--about-dim);
  font-size: 14px;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-rail__link::before {
  content: "";
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--mauve);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--gold-light);
  border-color: var(--about-edge);
  background: rgba(23, 58, 94, 0.68);
}

.page-about .about-rail__link:hover::before,
.page-about .about-rail__link:focus-visible::before {
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(233, 180, 76, 0.2);
}

.page-about .about-rail__link:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

.page-about .about-rail__label {
  white-space: nowrap;
}

.page-about .about-rail__year {
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--mauve);
}

/* ---------- 章节流 ---------- */

.page-about .about-flow {
  counter-reset: about-sec;
  min-width: 0;
}

.page-about .about-section {
  padding-block: 34px 40px;
  border-top: 1px solid var(--about-edge-soft);
}

.page-about .about-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-section__title {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 10px;
  font-family: var(--font-display);
  font-size: clamp(21px, 3.6vw, 31px);
  font-weight: 700;
  line-height: 1.32;
  letter-spacing: -0.015em;
  color: var(--cream);
  margin: 0 0 18px;
}

.page-about .about-section__title::before {
  counter-increment: about-sec;
  content: counter(about-sec, decimal-leading-zero);
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--gold);
  padding: 3px 8px;
  border: 1px solid var(--about-edge-soft);
  border-radius: var(--radius-pill);
}

.page-about .about-section p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--about-text);
  max-width: 34em;
}

.page-about .about-section strong {
  color: var(--gold-light);
  font-weight: 600;
}

.page-about .about-link {
  color: var(--red-bright);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 122, 100, 0.45);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

.page-about .about-link:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
  border-radius: 3px;
}

/* ---------- 团队三块 ---------- */

.page-about .about-crew {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-crew__item {
  padding: 16px 16px 18px;
  border: 1px solid var(--about-edge-soft);
  border-radius: var(--radius-md);
  background: linear-gradient(150deg, rgba(23, 58, 94, 0.55), rgba(11, 16, 38, 0.14));
}

.page-about .about-crew__num {
  display: block;
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-crew__name {
  display: block;
  margin-top: 8px;
  font-size: 15px;
  font-weight: 600;
  color: var(--cream);
}

.page-about .about-crew__desc {
  display: block;
  margin-top: 5px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--mauve);
}

/* ---------- 七类标签 ---------- */

.page-about .about-cats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 22px;
  padding: 0;
  list-style: none;
}

.page-about .about-cats li {
  padding: 7px 15px;
  border: 1px solid var(--about-edge);
  border-radius: var(--radius-pill);
  background: rgba(23, 58, 94, 0.45);
  font-size: 13px;
  color: var(--cream);
}

/* ---------- 折叠补充 ---------- */

.page-about .about-fold {
  margin: 20px 0;
  padding: 14px 16px;
  border: 1px solid var(--about-edge-soft);
  border-radius: var(--radius-md);
  background: rgba(23, 58, 94, 0.24);
}

.page-about .about-fold summary {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 32px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 600;
  color: var(--gold-light);
}

.page-about .about-fold summary::-webkit-details-marker {
  display: none;
}

.page-about .about-fold summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-fold[open] summary::after {
  content: "−";
}

.page-about .about-fold summary:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 4px;
  border-radius: 6px;
}

.page-about .about-fold p {
  margin: 12px 0 0;
  font-size: 15px;
}

/* ---------- 时间轴 SVG ---------- */

.page-about .about-tl {
  margin: 22px 0 24px;
  padding: 14px 10px;
  border: 1px solid var(--about-edge);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 150% at 8% 0%, rgba(217, 71, 56, 0.18), transparent 56%),
    rgba(23, 58, 94, 0.26);
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-tl svg {
  display: block;
  width: 100%;
  min-width: 520px;
  height: auto;
}

.page-about .about-tl text {
  font-family: var(--font-mono);
}

/* ---------- 图片错落 ---------- */

.page-about .about-figure {
  margin: 24px 0 22px;
  border: 1px solid var(--about-edge-soft);
}

/* ---------- 收束 ---------- */

.page-about .about-cta {
  margin-top: 26px;
  padding: 26px 22px;
  border: 1px solid var(--about-edge);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(135deg, rgba(217, 71, 56, 0.22), rgba(23, 58, 94, 0.42) 58%, rgba(11, 16, 38, 0.12));
}

.page-about .about-cta__title {
  font-family: var(--font-display);
  font-size: clamp(19px, 2.8vw, 24px);
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: -0.01em;
  margin: 0 0 12px;
  color: var(--cream);
  max-width: 24em;
}

.page-about .about-cta__text {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-text);
  max-width: 32em;
}

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

/* ---------- 平板及以上 ---------- */

@media (min-width: 640px) {
  .page-about .about-crew {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-hero__stats {
    padding: 20px;
  }

  .page-about .about-cta {
    padding: 32px 28px;
  }
}

@media (min-width: 900px) {
  .page-about .about-lede {
    padding-block: 56px 16px;
  }

  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 56px;
    align-items: end;
    margin-top: 28px;
  }

  .page-about .about-hero__stats {
    align-self: end;
  }

  .page-about .about-body__grid {
    grid-template-columns: 156px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 48px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__item {
    flex: none;
  }

  .page-about .about-rail__link {
    width: 100%;
    border: 0;
    border-left: 2px solid var(--about-edge-soft);
    border-radius: 0;
    background: transparent;
    padding: 11px 0 11px 14px;
    font-size: 13px;
    transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-color: transparent;
    border-left-color: var(--gold);
    background: linear-gradient(90deg, rgba(233, 180, 76, 0.14), transparent 82%);
  }

  .page-about .about-rail__year {
    display: none;
  }

  .page-about .about-section {
    padding-block: 44px 52px;
  }

  .page-about .about-figure--narrow {
    max-width: 620px;
    margin-inline-end: 56px;
  }

  .page-about .about-tl {
    padding: 20px 18px;
  }

  .page-about .about-figure {
    margin-block: 30px 26px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-body__grid {
    grid-template-columns: 172px minmax(0, 1fr);
    gap: 72px;
  }

  .page-about .about-hero__figure {
    margin-top: 42px;
  }
}

/* ---------- 降级动画 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }
}