.page-about {
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  overflow-x: hidden;
  padding-bottom: 64px;
}

.page-about .about-wrap {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding-left: 18px;
  padding-right: 18px;
}

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

.page-about a:hover,
.page-about a:focus-visible {
  color: var(--magenta);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-crumbs {
  max-width: 1160px;
  margin: 0 auto;
  padding: 22px 18px 0;
}

.page-about .about-crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4em;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .about-crumbs li + li::before {
  content: "/";
  margin-right: 0.4em;
  color: var(--line);
}

.page-about .about-crumbs li[aria-current="page"] {
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 26px;
  padding-top: 26px;
  padding-bottom: 46px;
}

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

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: 4px;
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 4px;
  pointer-events: none;
  background: repeating-linear-gradient(
    to bottom,
    rgba(7, 7, 12, 0) 0 3px,
    rgba(7, 7, 12, 0.3) 3px 4px
  );
}

.page-about .about-hero__stamp {
  position: absolute;
  left: 12px;
  bottom: 12px;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ink);
  background: var(--amber);
  padding: 4px 9px;
  border-radius: 2px;
}

.page-about .label {
  display: inline-block;
  margin: 0 0 12px;
  padding: 3px 9px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--violet);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--cyan);
  line-height: 1.5;
}

.page-about h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.05rem, 7.4vw, 4rem);
  line-height: 1.08;
  letter-spacing: 0.005em;
  color: var(--white);
}

.page-about h1 span {
  display: block;
  color: var(--cyan);
}

.page-about .about-lede {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-stats {
  list-style: none;
  margin: 26px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
}

.page-about .about-stats li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.5rem;
  line-height: 1.1;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stats__key {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding: 40px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-head {
  margin-bottom: 24px;
}

.page-about h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.45rem, 4.4vw, 2.3rem);
  line-height: 1.28;
  color: var(--white);
}

.page-about h3.about-mini {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  line-height: 1.4;
  color: var(--amber);
}

.page-about .about-prose p {
  margin: 0 0 1.05em;
  max-width: 36em;
  color: var(--muted);
}

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

.page-about .about-prose--wide {
  margin-top: 26px;
}

.page-about .about-quote {
  margin: 26px 0 0;
  padding: 16px 18px;
  border-left: 2px solid var(--magenta);
  background: var(--cabin);
  border-radius: 0 4px 4px 0;
  font-family: var(--font-display);
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--white);
}

/* ---------- 错位图文 ---------- */
.page-about .about-split {
  display: grid;
  gap: 24px;
}

.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 4px;
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 分类卡 ---------- */
.page-about .about-cats {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .about-cats li {
  position: relative;
  padding: 16px 16px 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
}

.page-about .about-cats li::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--violet);
}

.page-about .about-cats li:nth-child(2)::before { background: var(--cyan); }
.page-about .about-cats li:nth-child(3)::before { background: var(--magenta); }
.page-about .about-cats li:nth-child(4)::before { background: var(--amber); }
.page-about .about-cats li:nth-child(5)::before { background: var(--green); }
.page-about .about-cats li:nth-child(6)::before { background: var(--violet); }

.page-about .about-cats strong {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-cats span {
  display: block;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 折叠卡 ---------- */
.page-about .about-acc {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 4px;
  align-self: start;
}

.page-about .about-acc summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--amber);
}

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

.page-about .about-acc summary::after {
  content: "+";
  font-size: 15px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-acc details[open] summary::after {
  content: "\2212";
}

.page-about .about-acc summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -3px;
}

.page-about .about-acc__list {
  list-style: none;
  margin: 0;
  padding: 0 16px 16px;
  display: grid;
  gap: 10px;
}

.page-about .about-acc__list li {
  padding-left: 12px;
  border-left: 1px solid var(--line);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-acc__list b {
  color: var(--white);
  font-weight: 600;
}

/* ---------- 时间轴 ---------- */
.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(to bottom, var(--cyan), var(--violet) 55%, var(--line));
}

.page-about .about-tl__node {
  position: relative;
  padding-bottom: 6px;
}

.page-about .about-tl__node::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 16px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--violet);
  transition: background var(--t-hover) var(--ease), border-color var(--t-hover) var(--ease);
}

.page-about .about-tl__node:hover::before,
.page-about .about-tl__node:focus-within::before {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-tl summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
  padding: 8px 0 6px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-tl summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .about-tl__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.25rem;
  line-height: 1.1;
  letter-spacing: 0.04em;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .about-tl__title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-tl__body {
  margin: 0 0 12px;
  padding: 2px 0 10px;
  max-width: 34em;
  border-bottom: 1px dashed var(--line);
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 覆盖数据 ---------- */
.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
}

.page-about .about-metrics div {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 14px;
  background: var(--cabin);
  min-width: 0;
}

.page-about .about-metrics__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.35rem, 5vw, 2rem);
  line-height: 1.05;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-metrics__key {
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  margin-top: 26px;
  padding: 24px 18px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background:
    linear-gradient(135deg, rgba(124, 58, 237, 0.28), rgba(34, 211, 238, 0.08) 58%, var(--cabin));
}

.page-about .about-cta__text {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--white);
}

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

.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 18px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: border-color var(--t-hover) var(--ease), color var(--t-hover) var(--ease), transform var(--t-hover) var(--ease);
}

.page-about .btn:hover,
.page-about .btn:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  text-decoration: none;
  transform: translateY(-1px);
}

.page-about .btn--primary {
  background: var(--violet);
  border-color: var(--violet);
  color: var(--white);
}

.page-about .btn--primary:hover,
.page-about .btn--primary:focus-visible {
  background: #8f5bf5;
  border-color: var(--cyan);
  color: var(--white);
}

.page-about [data-reveal] {
  transition: opacity 400ms var(--ease), transform 400ms var(--ease);
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .about-cats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-wrap {
    padding-left: 28px;
    padding-right: 28px;
  }

  .page-about .about-crumbs {
    padding-left: 28px;
    padding-right: 28px;
  }

  .page-about .about-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-wrap {
    padding-left: 40px;
    padding-right: 40px;
  }

  .page-about .about-crumbs {
    padding-left: 40px;
    padding-right: 40px;
    padding-top: 28px;
  }

  .page-about .about-hero {
    grid-template-columns: 5fr 7fr;
    gap: 52px;
    align-items: center;
    padding-top: 48px;
    padding-bottom: 72px;
  }

  .page-about .about-section {
    padding: 68px 0;
  }

  .page-about .about-head {
    margin-bottom: 32px;
  }

  .page-about .about-split {
    grid-template-columns: 7fr 5fr;
    gap: 44px;
    align-items: start;
  }

  .page-about .about-split--flip {
    grid-template-columns: 5fr 7fr;
  }

  .page-about .about-split--flip > .about-prose {
    order: 2;
  }

  .page-about .about-split--flip > .about-figure,
  .page-about .about-split--flip > .about-acc {
    order: 1;
  }

  .page-about .about-figure--offset {
    margin-top: 36px;
  }

  .page-about .about-figure--square img {
    aspect-ratio: 1 / 1;
  }

  .page-about .about-cats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-top: 34px;
  }

  .page-about .about-tl {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 48px;
    padding-left: 26px;
  }

  .page-about .about-tl::before {
    bottom: 24px;
  }

  .page-about .about-cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 28px 30px;
  }

  .page-about .about-cta__text {
    margin: 0;
    max-width: 30em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about .btn,
  .page-about .about-tl__node::before {
    transition: none;
  }

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