.page-about {
  padding: 34px 0 88px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  margin-top: 22px;
  align-items: end;
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.05rem, 8.4vw, 4rem);
  line-height: 1.06;
  letter-spacing: -0.015em;
  color: var(--white);
  transform: skewX(-3deg);
  transform-origin: left bottom;
}

.page-about .about-hero__hl {
  color: var(--neon);
  -webkit-text-stroke: 1px var(--neon);
  text-shadow: 0 0 26px rgba(53, 255, 139, 0.42);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 46ch;
  color: var(--mist);
  font-size: 1rem;
  line-height: 1.8;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 12px;
  border-left: 2px solid var(--neon);
  color: var(--mist);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
}

.page-about .about-hero__fig-num {
  color: var(--white);
  font-size: 1.32rem;
  font-weight: 700;
  line-height: 1.1;
}

/* ---------- 图片容器 ---------- */
.page-about .about-fig {
  margin: 0;
  position: relative;
}

.page-about .about-fig .frame img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-fig figcaption {
  margin-top: 10px;
  color: var(--mist);
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  line-height: 1.6;
}

.page-about .about-fig--hero {
  border-top: 2px solid var(--steel);
  padding-top: 12px;
}

/* ---------- 时间轴容器 ---------- */
.page-about .about-tl {
  position: relative;
  margin-top: 68px;
  overflow: hidden;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  top: 8%;
  left: -12%;
  width: 132%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--neon) 18%, var(--steel) 62%, transparent);
  transform: rotate(12deg);
  transform-origin: left center;
  opacity: 0.42;
  pointer-events: none;
}

.page-about .about-tl__title {
  position: relative;
  margin: 0 0 26px;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.35rem, 4.6vw, 2rem);
  line-height: 1.3;
  color: var(--white);
}

/* ---------- 阶段轴导航 ---------- */
.page-about .about-axis {
  position: relative;
  margin-bottom: 8px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--steel);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-axis__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  min-width: max-content;
}

.page-about .about-axis__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 14px;
  background: rgba(14, 36, 80, 0.72);
  border: 1px solid var(--steel);
  color: var(--mist);
  font-size: 0.82rem;
  text-decoration: none;
  clip-path: polygon(12px 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
  transition: color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

.page-about .about-axis__list a .mono {
  color: var(--neon);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}

.page-about .about-axis__list a:hover,
.page-about .about-axis__list a:focus-visible {
  color: var(--white);
  background: rgba(53, 255, 139, 0.14);
  transform: translateY(-2px);
}

/* ---------- 章节节点 ---------- */
.page-about .tl-node {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  padding: 46px 0 42px;
  scroll-margin-top: 90px;
}

.page-about .tl-node::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 12px;
  width: 136px;
  height: 2px;
  background: linear-gradient(90deg, var(--neon), var(--steel));
  transform: rotate(12deg);
  transform-origin: left center;
  opacity: 0.75;
  pointer-events: none;
}

.page-about .tl-node__rail {
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-about .tl-node__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 82px;
  height: 62px;
  background: linear-gradient(140deg, rgba(53, 255, 139, 0.2), rgba(29, 50, 96, 0.85));
  border-left: 3px solid var(--neon);
  clip-path: polygon(16% 0, 100% 0, 84% 100%, 0 100%);
  color: var(--white);
  font-size: 1.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: transform 0.25s ease, background 0.25s ease, box-shadow 0.25s ease;
}

.page-about .tl-node__num:hover,
.page-about .tl-node__num:focus-visible {
  transform: translateX(6px) scale(1.05);
  background: linear-gradient(140deg, rgba(53, 255, 139, 0.42), rgba(29, 50, 96, 0.95));
  box-shadow: 0 10px 24px rgba(53, 255, 139, 0.18);
}

.page-about .tl-node__stage {
  margin: 0;
  color: var(--mist);
  font-size: 0.78rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

.page-about .tl-node__body h3 {
  margin: 8px 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.28rem, 5vw, 1.76rem);
  line-height: 1.28;
  color: var(--white);
  transform: skewX(-2deg);
  transform-origin: left center;
}

.page-about .tl-node__body p {
  margin: 0 0 14px;
  color: var(--mist);
  line-height: 1.8;
  font-size: 0.96rem;
}

.page-about .tl-node__body p:last-of-type {
  margin-bottom: 0;
}

.page-about .tl-node__points {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .tl-node__points li {
  position: relative;
  padding-left: 20px;
  color: var(--white);
  font-size: 0.9rem;
  line-height: 1.6;
}

.page-about .tl-node__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.58em;
  width: 10px;
  height: 2px;
  background: var(--neon);
  transform: rotate(-12deg);
}

.page-about .tl-node__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 0;
}

.page-about .tl-node__link {
  display: inline-block;
  margin-top: 20px;
  color: var(--neon);
  font-size: 0.88rem;
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 255, 139, 0.4);
  padding-bottom: 3px;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .tl-node__link::after {
  content: " →";
}

.page-about .tl-node__link:hover,
.page-about .tl-node__link:focus-visible {
  color: var(--white);
  border-color: var(--white);
}

.page-about .about-fig--mid,
.page-about .about-fig--strip {
  margin: 6px 0 0;
  padding-left: 0;
}

.page-about .about-fig--strip .frame {
  max-width: 340px;
}

/* ---------- 规模一览 ---------- */
.page-about .about-scale {
  margin-top: 84px;
  padding: 40px 22px 34px;
  background:
    linear-gradient(150deg, rgba(14, 36, 80, 0.92), rgba(6, 22, 51, 0.6)),
    repeating-linear-gradient(90deg, rgba(29, 50, 96, 0.45) 0, rgba(29, 50, 96, 0.45) 1px, transparent 1px, transparent 22px);
  clip-path: polygon(0 22px, 22px 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .about-scale__head h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.32rem, 4.6vw, 1.94rem);
  line-height: 1.3;
  color: var(--white);
}

.page-about .about-scale__lede {
  margin: 14px 0 0;
  max-width: 52ch;
  color: var(--mist);
  font-size: 0.94rem;
  line-height: 1.8;
}

.page-about .about-scale__grid {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--steel);
  border: 1px solid var(--steel);
}

.page-about .about-scale__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 16px;
  background: var(--ink);
}

.page-about .about-scale__num {
  color: var(--neon);
  font-size: clamp(1.6rem, 7vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
}

.page-about .about-scale__num .about-scale__small {
  font-size: 0.82rem;
  margin-left: 4px;
  letter-spacing: 0.04em;
  color: var(--gold);
}

.page-about .about-scale__unit {
  color: var(--mist);
  font-size: 0.84rem;
  letter-spacing: 0.02em;
}

.page-about .about-scale__team {
  margin-top: 34px;
  padding-top: 26px;
  border-top: 1px dashed var(--steel);
}

.page-about .about-scale__team h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--white);
}

.page-about .about-scale__team p {
  margin: 0 0 12px;
  color: var(--mist);
  font-size: 0.94rem;
  line-height: 1.8;
}

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

/* ---------- 结尾引导 ---------- */
.page-about .about-next {
  margin-top: 66px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  padding: 30px 22px;
  border-left: 3px solid var(--violet);
  background: linear-gradient(100deg, rgba(155, 107, 255, 0.14), rgba(6, 22, 51, 0) 72%);
}

.page-about .about-next h2 {
  margin: 10px 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.2rem, 4.4vw, 1.68rem);
  line-height: 1.32;
  color: var(--white);
}

.page-about .about-next p {
  margin: 0;
  max-width: 48ch;
  color: var(--mist);
  font-size: 0.94rem;
  line-height: 1.8;
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

/* ---------- 平板 ---------- */
@media (min-width: 700px) {
  .page-about .about-scale__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-next {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.8fr);
    align-items: end;
    padding: 36px 30px;
  }

  .page-about .about-next__links {
    justify-content: flex-end;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about {
    padding: 52px 0 108px;
  }

  .page-about .about-hero {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    gap: 52px;
    margin-top: 30px;
  }

  .page-about .about-fig--hero {
    border-top: none;
    padding-top: 0;
    border-right: 2px solid var(--steel);
    padding-right: 22px;
  }

  .page-about .about-tl {
    margin-top: 104px;
  }

  .page-about .about-tl__title {
    margin-bottom: 34px;
  }

  /* 非对称错列：奇数节点内容靠左，偶数节点内容右移 */
  .page-about .tl-node {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 34px;
    padding: 64px 0 58px;
  }

  .page-about .tl-node__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .page-about .tl-node__num {
    width: 104px;
    height: 78px;
    font-size: 2.1rem;
  }

  .page-about .tl-node__body {
    max-width: 62ch;
  }

  .page-about .tl-node:nth-of-type(even) .tl-node__body {
    margin-left: 12%;
  }

  .page-about .tl-node::after {
    width: 220px;
    bottom: 16px;
  }

  .page-about .about-fig--mid {
    width: 72%;
    margin-left: 168px;
    margin-top: -20px;
  }

  .page-about .about-fig--strip {
    width: 30%;
    margin-left: auto;
    margin-right: 6%;
    margin-top: -40px;
  }

  .page-about .about-scale {
    margin-top: 110px;
    padding: 56px 44px 46px;
  }

  .page-about .about-scale__grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    margin-top: 42px;
  }

  .page-about .about-scale__item {
    padding: 26px 14px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero {
    gap: 66px;
  }

  .page-about .about-fig--mid {
    width: 64%;
  }
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .tl-node__num,
  .page-about .about-axis__list a,
  .page-about .tl-node__link {
    transition: none;
  }

  .page-about .tl-node__num:hover,
  .page-about .tl-node__num:focus-visible,
  .page-about .about-axis__list a:hover,
  .page-about .about-axis__list a:focus-visible {
    transform: none;
  }
}