.page-about {
  --about-rail-w: 88px;
  --about-pad: 84px;
  display: block;
  overflow-x: clip;
}

@media (min-width: 900px) {
  .page-about {
    --about-rail-w: 108px;
    --about-pad: 148px;
  }
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: 32px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 20px 0 56px;
  background:
    radial-gradient(880px 460px at 84% -6%, rgba(46, 107, 255, .2), transparent 68%),
    radial-gradient(620px 420px at 8% 108%, rgba(255, 106, 43, .1), transparent 70%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
  align-items: center;
  padding-block: 28px 36px;
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    gap: 56px;
    padding-block: 44px 60px;
  }
}

.page-about .about-hero h1 {
  margin: 16px 0 0;
  font-size: clamp(34px, 6.2vw, 60px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--snow);
}

.page-about .about-hero__copy .lead {
  margin: 22px 0 0;
  max-width: 34em;
  font-size: clamp(16px, 1.15vw, 18px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-hero__visual {
  position: relative;
  padding: 8px 0;
}

.page-about .about-hero__svg {
  display: block;
  width: 100%;
  max-width: 520px;
  height: auto;
  margin-inline: auto;
}

@media (min-width: 960px) {
  .page-about .about-hero__svg {
    margin-inline: 0 0;
  }
}

.page-about .about-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  position: relative;
  padding-block: var(--about-pad);
}

.page-about .about-section + .about-section {
  border-top: 1px solid var(--line);
}

.page-about .about-section__grid {
  display: grid;
  gap: 22px;
}

@media (min-width: 900px) {
  .page-about .about-section__grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 0 48px;
  }
}

.page-about .about-section--media .about-section__grid {
  align-items: start;
}

@media (min-width: 1100px) {
  .page-about .about-section--media .about-section__grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1.04fr) minmax(0, .84fr);
    gap: 0 56px;
  }
}

/* 章节左侧编号轨道 */
.page-about .about-rail {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

@media (min-width: 900px) {
  .page-about .about-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    position: sticky;
    top: 104px;
    align-self: start;
  }
}

.page-about .about-rail__num {
  font-size: clamp(40px, 8vw, 56px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: transparent;
  -webkit-text-stroke: 1.6px var(--blue);
}

@supports not (-webkit-text-stroke: 1px #000) {
  .page-about .about-rail__num {
    color: var(--blue);
  }
}

.page-about .about-rail__label {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .3em;
  color: var(--mist);
}

@media (min-width: 900px) {
  .page-about .about-rail__label {
    writing-mode: vertical-rl;
    letter-spacing: .36em;
    padding-left: 6px;
  }
}

/* 章节正文 */
.page-about .about-section__body h2 {
  margin: 0 0 22px;
  font-size: clamp(26px, 3.5vw, 40px);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -.02em;
  color: var(--snow);
}

.page-about .about-section__body p {
  margin: 0 0 1.2em;
  max-width: 34em;
  font-size: clamp(16px, 1.06vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}

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

.page-about .about-section__media {
  margin: 28px 0 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-900);
}

@media (min-width: 900px) {
  .page-about .about-section--media .about-section__media {
    margin: 0;
  }
}

@media (min-width: 900px) and (max-width: 1099px) {
  .page-about .about-section--media .about-section__grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
  }

  .page-about .about-section--media .about-section__media {
    grid-column: 2;
    margin-top: 8px;
  }
}

.page-about .about-section__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* 01 起点小胶囊 */
.page-about .about-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-pill {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 18px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  background: rgba(20, 27, 43, .7);
}

.page-about .about-pill__k {
  font-size: 15px;
  font-weight: 700;
  color: var(--green);
}

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

/* ---------- 02 版图 ---------- */
.page-about .about-map {
  position: relative;
  margin-top: 44px;
}

.page-about .about-map img {
  display: block;
  width: 100%;
  height: clamp(260px, 42vw, 500px);
  object-fit: cover;
  border-radius: var(--r-lg);
  opacity: .7;
}

.page-about .about-map::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--r-lg);
  background-image: radial-gradient(rgba(111, 227, 255, .34) 1px, transparent 1.4px);
  background-size: 22px 22px;
  -webkit-mask-image: radial-gradient(72% 72% at 50% 50%, #000 24%, transparent 100%);
  mask-image: radial-gradient(72% 72% at 50% 50%, #000 24%, transparent 100%);
  pointer-events: none;
}

.page-about .about-map__hot {
  position: absolute;
  z-index: 2;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 6px rgba(55, 245, 160, .16);
  transform: translate(-50%, -50%);
  outline: none;
}

.page-about .about-map__hot--a { left: 44%; top: 66%; }
.page-about .about-map__hot--b { left: 66%; top: 34%; }
.page-about .about-map__hot--c { left: 26%; top: 42%; background: var(--orange); box-shadow: 0 0 0 6px rgba(255, 106, 43, .16); }

.page-about .about-map__tip {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 14px);
  transform: translateX(-50%) translateY(6px);
  white-space: nowrap;
  padding: 8px 14px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-strong);
  background: var(--ink-800);
  color: var(--snow);
  font-size: 13px;
  line-height: 1.2;
  opacity: 0;
  pointer-events: none;
  transition: opacity .24s var(--ease), transform .24s var(--ease);
}

.page-about .about-map__hot:hover .about-map__tip,
.page-about .about-map__hot:focus .about-map__tip,
.page-about .about-map__hot:focus-visible .about-map__tip {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-stat {
  padding: 26px 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(180deg, rgba(20, 27, 43, .92), rgba(11, 18, 32, .68));
}

.page-about .about-stat__num {
  display: block;
  font-size: clamp(28px, 3.6vw, 40px);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--snow);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 03 内容线 ---------- */
.page-about .about-layers {
  margin: 40px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-layer {
  display: grid;
  gap: 12px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

@media (min-width: 760px) {
  .page-about .about-layer {
    grid-template-columns: 168px minmax(0, 1fr) 170px;
    gap: 36px;
    align-items: start;
    padding: 34px 0;
  }
}

.page-about .about-layer__key {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--cyan);
}

.page-about .about-layer p {
  margin: 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-layer__meta {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--green);
}

@media (min-width: 760px) {
  .page-about .about-layer__meta {
    text-align: right;
    padding-top: 4px;
  }
}

/* ---------- 04 团队 ---------- */
.page-about .about-section__body--split {
  display: grid;
  gap: 32px;
}

@media (min-width: 760px) {
  .page-about .about-section__body--split {
    grid-template-columns: auto minmax(0, 1fr);
    gap: 44px;
    align-items: center;
  }
}

.page-about .about-ring {
  position: relative;
  width: min(240px, 64vw);
  aspect-ratio: 1;
  border-radius: 50%;
  background: conic-gradient(
    from -90deg,
    var(--blue) 0 62.2%,
    var(--orange) 62.2% 88.9%,
    var(--ink-800) 88.9% 100%
  );
}

.page-about .about-ring__hole {
  position: absolute;
  inset: 26px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border-radius: 50%;
  background: var(--ink-950);
  text-align: center;
}

.page-about .about-ring__num {
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  color: var(--snow);
}

.page-about .about-ring__cap {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .about-team__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 24px;
}

.page-about .about-team__list strong {
  display: block;
  font-size: 16px;
  font-weight: 700;
  color: var(--snow);
}

.page-about .about-team__list p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  margin-right: 10px;
  border-radius: 50%;
  vertical-align: middle;
}

.page-about .about-dot--blue { background: var(--blue); }
.page-about .about-dot--orange { background: var(--orange); }

.page-about .about-wide-media {
  margin: 44px 0 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-900);
}

.page-about .about-wide-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-wide-media figcaption {
  padding: 14px 20px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
  border-top: 1px solid var(--line);
}

/* ---------- 05 版本 ---------- */
.page-about .about-versions {
  display: grid;
  gap: 18px;
  margin: 40px 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 860px) {
  .page-about .about-versions {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }
}

.page-about .about-ver-item {
  position: relative;
  padding: 28px 24px 30px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(180deg, rgba(20, 27, 43, .82), rgba(5, 7, 13, .5));
}

.page-about .about-ver-item::before {
  content: "";
  position: absolute;
  left: 24px;
  right: 24px;
  top: 0;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--green), transparent);
}

.page-about .about-ver-item--current {
  border-color: rgba(46, 107, 255, .55);
  background: linear-gradient(180deg, rgba(46, 107, 255, .16), rgba(5, 7, 13, .5));
}

.page-about .about-ver-item--current::before {
  background: linear-gradient(90deg, var(--blue), transparent);
}

.page-about .about-ver {
  display: inline-block;
  padding: 7px 16px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-strong);
  font-size: 14px;
  letter-spacing: .08em;
  color: var(--snow);
  background: rgba(5, 7, 13, .6);
}

.page-about .about-ver-item--current .about-ver {
  background: var(--blue);
  border-color: var(--blue);
  color: var(--snow);
}

.page-about .about-ver-item h3 {
  margin: 18px 0 10px;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--snow);
}

.page-about .about-ver-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

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

/* ---------- 06 协作生态 ---------- */
.page-about .about-accordion {
  margin-top: 40px;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  position: relative;
  margin-top: 40px;
  padding-block: 72px;
  border-top: 1px solid var(--line);
  background:
    radial-gradient(720px 360px at 88% 20%, rgba(255, 106, 43, .14), transparent 70%),
    radial-gradient(560px 320px at 6% 90%, rgba(46, 107, 255, .16), transparent 72%);
}

@media (min-width: 900px) {
  .page-about .about-cta {
    padding-block: 104px;
  }
}

.page-about .about-cta__inner {
  display: grid;
  gap: 32px;
}

@media (min-width: 900px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.2fr) auto;
    gap: 56px;
    align-items: center;
  }
}

.page-about .about-cta h2 {
  margin: 0;
  font-size: clamp(24px, 3.2vw, 38px);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -.02em;
  color: var(--snow);
}

.page-about .about-cta p {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

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

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-map__tip {
    transition: none;
  }
}