.page-about {
  --about-node: 7px;
  padding: 24px 0 80px;
}

.page-about .breadcrumb {
  margin-bottom: 18px;
  font-size: 13px;
  color: var(--muted);
}

.page-about .breadcrumb a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.page-about .breadcrumb__sep {
  margin: 0 8px;
  color: var(--line);
}

.page-about .breadcrumb__current {
  color: var(--muted);
}

/* ---------- 首屏框景 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 32px 22px 26px;
  background:
    radial-gradient(120% 140% at 88% 0%, rgba(200, 247, 65, 0.07) 0%, rgba(200, 247, 65, 0) 58%),
    linear-gradient(158deg, var(--raise) 0%, var(--panel) 62%, var(--bg) 100%);
  border: 1px solid var(--line);
  box-shadow: 8px 8px 0 0 var(--frame);
  margin-bottom: 30px;
}

.page-about .about-hero .h1 {
  margin: 12px 0 0;
  font-family: var(--font-cond);
  font-size: clamp(30px, 7.2vw, 58px);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--ink-strong);
}

.page-about .about-hero__lede {
  max-width: 62ch;
  margin: 18px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
  margin: 26px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 12px;
  line-height: 1.4;
  color: var(--muted);
}

.page-about .about-hero__facts .mono {
  font-size: 21px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.02em;
}

/* ---------- 分屏 ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .about-tl {
  display: flex;
  gap: 20px;
  margin: 0;
  padding: 0 0 12px;
  list-style: none;
  overflow-x: auto;
  border-bottom: 1px solid var(--line);
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-tl__cap {
  margin: 0 0 10px;
}

.page-about .about-tl__item {
  position: relative;
  flex: 0 0 auto;
}

.page-about .about-tl__label {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--font-cond);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur);
}

.page-about .about-tl__no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent-dim);
}

.page-about .about-tl__item.is-active .about-tl__label {
  color: var(--ink-strong);
}

.page-about .about-tl__item.is-active .about-tl__no {
  color: var(--accent);
}

.page-about .about-tl__item.is-active .about-tl__label::after {
  content: "";
  display: block;
  height: 2px;
  margin-top: 4px;
  background: var(--accent);
}

/* ---------- 章节 ---------- */

.page-about .about-sec {
  padding: 30px 0 6px;
  border-top: 1px solid var(--line);
}

.page-about .about-sec .h2 {
  margin: 8px 0 16px;
  font-family: var(--font-cond);
  font-size: clamp(22px, 4.6vw, 34px);
  font-weight: 700;
  line-height: 1.16;
  color: var(--ink-strong);
}

.page-about .about-sec .h3 {
  margin: 10px 0 6px;
  font-family: var(--font-cond);
  font-size: 19px;
  font-weight: 700;
  color: var(--ink-strong);
}

.page-about .about-sec .prose p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.68;
  color: var(--ink);
}

.page-about .about-sec .prose a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--accent-dim);
}

.page-about .about-sec .prose a:hover,
.page-about .about-sec .prose a:focus-visible {
  border-bottom-color: var(--accent);
  background: rgba(200, 247, 65, 0.09);
}

/* ---------- 结构双栏 ---------- */

.page-about .about-duo {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  align-items: start;
}

.page-about .about-duo__media {
  margin: 4px 0 0;
}

.page-about .about-duo__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.68) contrast(1.04);
}

.page-about .media-frame__cap {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 索引示意 ---------- */

.page-about .about-mapwrap {
  margin-top: 26px;
  padding: 18px 16px 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent-dim);
}

.page-about .about-mapwrap__cap {
  margin: 0 0 12px;
}

.page-about .about-map {
  display: block;
  width: 100%;
  height: auto;
  max-width: 560px;
}

.page-about .about-map rect {
  fill: none;
  stroke: var(--line);
  stroke-width: 1;
  transition: stroke var(--dur), fill var(--dur);
}

.page-about .about-map rect:hover {
  stroke: var(--accent);
  fill: rgba(200, 247, 65, 0.06);
}

.page-about .about-map__t {
  fill: var(--ink-strong);
  font-family: var(--font-cond);
  font-size: 13px;
  font-weight: 600;
}

.page-about .about-map__n {
  fill: var(--accent);
  font-family: var(--font-mono);
  font-size: 12px;
}

.page-about .about-mapwrap__note {
  margin: 12px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 通栏图片断点 ---------- */

.page-about .about-break {
  margin: 34px 0 8px;
  padding: 0;
}

.page-about .about-break img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.55) contrast(1.06) brightness(0.92);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

/* ---------- 数据条带 ---------- */

.page-about .about-band {
  margin: 4px 0 20px;
}

.page-about .about-band .band__stat .mono {
  color: var(--accent);
  font-size: 24px;
  font-weight: 700;
}

/* ---------- 版本沿革 ---------- */

.page-about .about-versions__lead {
  margin: 0 0 14px;
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-versions__track {
  display: flex;
  gap: 14px;
  margin: 0;
  padding: 4px 0 18px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-versions__node {
  flex: 0 0 82%;
  scroll-snap-align: start;
  padding: 18px 16px 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 2px solid var(--accent-dim);
  box-shadow: 4px 4px 0 0 var(--frame);
}

.page-about .about-versions__year {
  display: inline-block;
  padding: 2px 8px;
  font-size: 12px;
  font-weight: 700;
  color: var(--bg);
  background: var(--accent);
  letter-spacing: 0.06em;
}

.page-about .about-versions__node .h3 {
  margin: 12px 0 6px;
  font-family: var(--font-cond);
  font-size: 19px;
  font-weight: 700;
  color: var(--ink-strong);
}

.page-about .about-versions__node p {
  margin: 0;
  font-size: 13px;
  line-height: 1.66;
  color: var(--ink);
}

.page-about .about-wide {
  margin: 18px 0 0;
}

.page-about .about-wide img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.5) contrast(1.08);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

/* ---------- 团队分工 ---------- */

.page-about .about-roles {
  margin: 6px 0 20px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-roles__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 0 15px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-roles__name {
  font-family: var(--font-cond);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink-strong);
  border-left: 3px solid var(--accent);
  padding-left: 10px;
}

.page-about .about-roles__name .mono {
  color: var(--accent);
}

.page-about .about-roles__desc {
  font-size: 14px;
  line-height: 1.66;
  color: var(--ink);
  padding-left: 13px;
}

/* ---------- 纸感联系面板 ---------- */

.page-about .about-paper {
  margin: 4px 0 22px;
  padding: 20px 18px;
}

.page-about .about-paper__line {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.6;
}

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

.page-about .about-paper__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.62;
}

.page-about .about-paper__v {
  font-weight: 600;
  word-break: break-word;
}

/* ---------- 中等宽度 ---------- */

@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 42px 34px 32px;
  }

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

  .page-about .about-duo {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    gap: 28px;
  }

  .page-about .about-versions__node {
    flex: 0 0 260px;
  }

  .page-about .about-mapwrap {
    padding: 22px 24px 20px;
  }

  .page-about .about-paper {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 0 26px;
  }

  .page-about .about-roles__row {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }
}

/* ---------- 桌面分屏 ---------- */

@media (min-width: 960px) {
  .page-about {
    padding-top: 34px;
  }

  .page-about .about-split {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 46px;
    align-items: start;
  }

  .page-about .about-split__aside {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-tl {
    display: block;
    padding: 0 0 0 16px;
    overflow: visible;
    border-bottom: 0;
  }

  .page-about .about-tl::before {
    content: "";
    position: absolute;
    left: 3px;
    top: 6px;
    bottom: 6px;
    width: 1px;
    background: var(--line);
  }

  .page-about .about-tl__cap {
    margin-bottom: 14px;
  }

  .page-about .about-tl__item {
    padding: 9px 0;
  }

  .page-about .about-tl__label {
    white-space: normal;
  }

  .page-about .about-tl__item.is-active .about-tl__label {
    transform: translateX(3px);
    transition: transform var(--dur), color var(--dur);
  }

  .page-about .about-tl__item.is-active .about-tl__label::after {
    display: none;
  }

  .page-about .about-tl__item.is-active .about-tl__label::before {
    content: "";
    position: absolute;
    left: -16px;
    top: 8px;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 0 3px rgba(200, 247, 65, 0.14);
  }

  .page-about .about-tl {
    position: relative;
  }

  .page-about .about-tl__item {
    position: relative;
  }

  .page-about .about-sec {
    padding-top: 34px;
  }

  .page-about .about-sec .prose p {
    max-width: 68ch;
  }

  .page-about .about-duo__media {
    margin-top: -6px;
  }

  .page-about .about-break {
    margin: 44px 0 12px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero {
    padding: 52px 46px 38px;
  }

  .page-about .about-hero__lede {
    font-size: 16px;
  }

  .page-about .about-split {
    grid-template-columns: 224px minmax(0, 1fr);
    gap: 60px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__label,
  .page-about .about-map rect,
  .page-about .about-tl__item.is-active .about-tl__label {
    transition: none;
  }
}
</main>