.page-about {
  position: relative;
  overflow-x: clip;
  padding-bottom: 12px;
}

.page-about .about-veil {
  position: absolute;
  inset: 0 0 auto 0;
  height: 640px;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(820px 420px at 6% -14%, rgba(124, 58, 237, .38), transparent 70%),
    radial-gradient(700px 380px at 94% -10%, rgba(6, 182, 212, .3), transparent 72%),
    linear-gradient(180deg, rgba(7, 10, 18, .85), rgba(11, 15, 26, 0));
}

.page-about > .container,
.page-about .about-hero {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumbs {
  padding: 22px 0 0;
  font-size: .82rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 30px 0 clamp(38px, 6vw, 72px);
}

.page-about .about-hero .eyebrow {
  margin: 0;
  font-size: .72rem;
  letter-spacing: .22em;
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  max-width: 17ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 6.2vw, 3.9rem);
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--bright);
  text-shadow: 0 0 34px rgba(124, 58, 237, .45), 0 0 90px rgba(6, 182, 212, .2);
}

.page-about .about-hero .lede {
  margin: 22px 0 0;
  max-width: 60ch;
  font-size: clamp(1rem, 1.5vw, 1.08rem);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__actions .btn {
  min-height: 46px;
}

.page-about .about-hero__facts {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(30px, 4.5vw, 46px) 0 0;
  padding: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 18px 16px;
  background: linear-gradient(165deg, rgba(30, 38, 54, .92), rgba(11, 15, 26, .96));
}

.page-about .about-hero__facts .stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.55rem, 3vw, 2.05rem);
  font-weight: 700;
  line-height: 1;
  color: var(--benz-gold);
  text-shadow: 0 0 22px rgba(212, 175, 55, .35);
}

.page-about .about-hero__facts .stat__label {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--muted);
}

/* ---------- 编号章节骨架 ---------- */
.page-about .about-chapter {
  position: relative;
  display: grid;
  gap: 18px;
  padding: clamp(34px, 5vw, 64px) 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-chapter__aside {
  align-self: start;
}

.page-about .about-chapter__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.8rem, 9vw, 4.6rem);
  line-height: .82;
  letter-spacing: -.03em;
  color: rgba(124, 58, 237, .3);
}

@supports (-webkit-text-stroke: 1px red) {
  .page-about .about-chapter__num {
    color: transparent;
    -webkit-text-stroke: 1.5px rgba(124, 58, 237, .78);
  }
}

.page-about .about-chapter__kicker {
  display: block;
  margin-top: 10px;
  font-size: .68rem;
  letter-spacing: .24em;
  color: var(--electric-blue);
  opacity: .85;
}

.page-about .about-chapter__body {
  max-width: 72ch;
}

.page-about .about-chapter__body .section-title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: clamp(1.42rem, 3.4vw, 2.25rem);
  line-height: 1.24;
  color: var(--bright);
  text-shadow: 0 0 26px rgba(124, 58, 237, .26);
}

.page-about .about-chapter__body > p {
  margin: 0 0 16px;
  font-size: 1rem;
  line-height: 1.82;
  color: var(--muted);
}

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

/* ---------- 版本时间线 ---------- */
.page-about .version-line {
  position: relative;
  list-style: none;
  display: grid;
  gap: 14px;
  margin: 6px 0 26px;
  padding: 0 0 0 30px;
}

.page-about .version-line::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--neon-purple), var(--electric-blue) 62%, rgba(6, 182, 212, 0));
}

.page-about .version-line__item {
  position: relative;
  padding: 12px 14px 14px;
  border-left: 2px solid rgba(6, 182, 212, .32);
  background: linear-gradient(90deg, rgba(30, 38, 54, .6), rgba(30, 38, 54, 0));
  transition: border-color .35s var(--ease), background .35s var(--ease);
}

.page-about .version-line__item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 18px;
  width: 10px;
  height: 10px;
  background: var(--night);
  border: 2px solid var(--electric-blue);
  transform: rotate(45deg);
  box-shadow: 0 0 14px rgba(6, 182, 212, .65);
  transition: border-color .35s var(--ease), box-shadow .35s var(--ease);
}

.page-about .version-line__item:hover,
.page-about .version-line__item:focus-within {
  border-left-color: var(--laser-green);
  background: linear-gradient(90deg, rgba(57, 255, 136, .09), rgba(30, 38, 54, 0));
}

.page-about .version-line__item:hover::before,
.page-about .version-line__item:focus-within::before {
  border-color: var(--laser-green);
  box-shadow: 0 0 18px rgba(57, 255, 136, .8);
}

.page-about .version-line__code {
  display: block;
  font-size: .74rem;
  letter-spacing: .16em;
  color: var(--benz-gold);
}

.page-about .version-line__item h3 {
  margin: 5px 0 6px;
  font-family: var(--font-display);
  font-size: clamp(1.02rem, 2vw, 1.2rem);
  font-weight: 700;
  line-height: 1.4;
  color: var(--bright);
}

.page-about .version-line__item p {
  margin: 0;
  font-size: .94rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 区域中心点阵 ---------- */
.page-about .center-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(158px, 1fr));
  gap: 10px;
  margin: 8px 0 26px;
  padding: 0;
}

.page-about .center-grid__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px 18px;
  border: 1px solid var(--line);
  background: linear-gradient(155deg, rgba(30, 38, 54, .88), rgba(11, 15, 26, .94));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: transform .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .center-grid__item:hover,
.page-about .center-grid__item:focus-within {
  transform: translateY(-3px);
  border-color: var(--line-strong);
  box-shadow: 0 14px 30px -18px rgba(124, 58, 237, .95);
}

.page-about .center-grid__item .mono {
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--benz-gold);
}

.page-about .center-grid__item strong {
  font-family: var(--font-display);
  font-size: 1.04rem;
  color: var(--bright);
}

.page-about .center-grid__item em {
  font-style: normal;
  font-size: .79rem;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 资质标签 ---------- */
.page-about .cred-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
}

/* ---------- 收尾入口 ---------- */
.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-cta .btn {
  min-height: 46px;
}

/* ---------- 图片容器 ---------- */
.page-about .about-chapter__body .media-frame {
  margin: 26px 0;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 900px) {
  .page-about .about-chapter {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 60px);
  }

  .page-about .about-chapter__aside {
    position: sticky;
    top: 112px;
  }
}

@media (min-width: 760px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 480px) {
  .page-about .about-hero__actions .btn,
  .page-about .about-cta .btn {
    flex: 1 1 100%;
    justify-content: center;
  }

  .page-about .center-grid {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .version-line__item,
  .page-about .center-grid__item {
    transition: none;
  }

  .page-about .center-grid__item:hover,
  .page-about .center-grid__item:focus-within {
    transform: none;
  }
}