.page-about {
  background: var(--navy);
  color: var(--ink);
  overflow-x: hidden;
}

.page-about .about-crumbs {
  padding-top: clamp(96px, 13vw, 140px);
  padding-bottom: 6px;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 4vw, 44px) 0 clamp(52px, 8vw, 112px);
}

.page-about .about-hero__slash {
  position: absolute;
  left: -12%;
  right: -12%;
  bottom: 4%;
  height: 46%;
  transform: rotate(-12deg);
  background: linear-gradient(90deg, rgba(0, 255, 170, 0.13), rgba(0, 255, 170, 0) 62%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__glow {
  position: absolute;
  top: -26%;
  right: -14%;
  width: 58vw;
  height: 58vw;
  max-width: 620px;
  max-height: 620px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(30, 74, 138, 0.55), rgba(10, 31, 68, 0) 68%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(32px, 5vw, 56px);
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-size: clamp(30px, 6.4vw, 72px);
  line-height: 1.08;
  font-weight: 300;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.15vw, 18px);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-hero__cta {
  margin: 30px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-facts__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: linear-gradient(150deg, rgba(30, 74, 138, 0.5), rgba(18, 48, 94, 0.3));
  clip-path: polygon(14px 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%, 0 14px);
  transition: background 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .about-facts__item:hover {
  transform: translateY(-4px);
  background: linear-gradient(150deg, rgba(0, 255, 170, 0.2), rgba(18, 48, 94, 0.45));
}

.page-about .about-facts__num {
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--neon);
}

.page-about .about-facts__cap {
  font-size: var(--step-13);
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ============ 编号纵列章节 ============ */
.page-about .about-chapter {
  position: relative;
  padding: clamp(48px, 7.5vw, 112px) 0;
  border-top: 1px solid rgba(30, 74, 138, 0.5);
}

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

.page-about .about-chapter__inner {
  display: grid;
  gap: 18px;
}

.page-about .about-chapter__rail {
  display: flex;
  align-items: baseline;
}

.page-about .about-chapter__num {
  display: block;
  font-size: clamp(38px, 9vw, 92px);
  line-height: 0.8;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: rgba(0, 255, 170, 0.2);
  transition: color 0.4s var(--ease);
}

.page-about .about-chapter__body {
  min-width: 0;
}

.page-about .about-chapter__title {
  margin: 10px 0 0;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.22;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-sub {
  margin: clamp(30px, 4vw, 44px) 0 0;
  font-size: var(--step-16);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-about .about-text {
  margin: 16px 0 0;
  max-width: 36em;
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.85;
  color: rgba(232, 241, 255, 0.86);
}

.page-about .about-note {
  margin: 18px 0 0;
  max-width: 36em;
  padding-left: 14px;
  border-left: 2px solid rgba(0, 255, 170, 0.5);
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ============ 图片 ============ */
.page-about .about-figure {
  margin: clamp(26px, 4vw, 44px) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid rgba(30, 74, 138, 0.7);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .about-figure__cap {
  display: block;
  margin-top: 10px;
  font-size: var(--step-13);
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ============ 规模数字条 ============ */
.page-about .about-stats {
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
  background: rgba(30, 74, 138, 0.35);
}

.page-about .about-stats__item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 18px 18px;
  background: var(--navy);
}

.page-about .about-stats__v {
  flex: 0 0 auto;
  font-size: clamp(22px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--neon);
}

.page-about .about-stats__l {
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}

/* ============ 类别分布条形图 ============ */
.page-about .about-bars {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-bar {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr) 40px;
  align-items: center;
  gap: 10px;
  padding: 4px 0;
}

.page-about .about-bar__name {
  font-size: var(--step-13);
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-bar__track {
  position: relative;
  display: block;
  height: 10px;
  background: rgba(30, 74, 138, 0.42);
  overflow: hidden;
}

.page-about .about-bar__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--rail), var(--neon));
  transition: width 0.6s var(--ease), filter 0.3s var(--ease);
}

.page-about .about-bar:hover .about-bar__fill {
  filter: brightness(1.25);
}

.page-about .about-bar:nth-child(1) .about-bar__fill { width: 100%; }
.page-about .about-bar:nth-child(2) .about-bar__fill { width: 78%; }
.page-about .about-bar:nth-child(3) .about-bar__fill { width: 67%; }
.page-about .about-bar:nth-child(4) .about-bar__fill { width: 39%; }
.page-about .about-bar:nth-child(5) .about-bar__fill { width: 28%; }
.page-about .about-bar:nth-child(6) .about-bar__fill { width: 22%; }
.page-about .about-bar:nth-child(7) .about-bar__fill { width: 11%; }

.page-about .about-bar__val {
  font-size: var(--step-13);
  text-align: right;
  color: var(--neon);
}

/* ============ 内容生产工序 ============ */
.page-about .about-flow {
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-flow__step {
  position: relative;
  padding: 18px 18px 18px 22px;
  background: linear-gradient(135deg, rgba(18, 48, 94, 0.6), rgba(6, 18, 41, 0.35));
  border-left: 2px solid var(--rail);
  transition: border-color 0.28s var(--ease), transform 0.28s var(--ease);
}

.page-about .about-flow__step:hover {
  border-left-color: var(--neon);
  transform: translateX(4px);
}

.page-about .about-flow__idx {
  display: inline-block;
  font-size: var(--step-13);
  letter-spacing: 0.1em;
  color: var(--neon);
}

.page-about .about-flow__h {
  margin: 6px 0 0;
  font-size: clamp(16px, 1.4vw, 19px);
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-flow__p {
  margin: 8px 0 0;
  max-width: 44em;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(232, 241, 255, 0.72);
}

/* ============ 版本时间轴 ============ */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-tl {
  position: relative;
  padding: 18px 20px 18px 28px;
  border-left: 2px solid var(--rail);
  background: linear-gradient(110deg, rgba(18, 48, 94, 0.52), rgba(6, 18, 41, 0.28));
  transition: border-color 0.28s var(--ease), transform 0.28s var(--ease), background 0.28s var(--ease);
}

.page-about .about-tl:hover {
  border-left-color: var(--neon);
  transform: translateX(5px);
  background: linear-gradient(110deg, rgba(0, 255, 170, 0.1), rgba(6, 18, 41, 0.3));
}

.page-about .about-tl__mark {
  position: absolute;
  left: -8px;
  top: 24px;
  width: 13px;
  height: 13px;
  background: var(--navy);
  border: 1px solid var(--rail);
  transform: rotate(45deg);
  transition: background 0.28s var(--ease), border-color 0.28s var(--ease);
}

.page-about .about-tl:hover .about-tl__mark {
  background: var(--neon);
  border-color: var(--neon);
}

.page-about .about-tl__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.page-about .about-tl__ver {
  font-size: var(--step-13);
  letter-spacing: 0.08em;
  color: var(--neon);
}

.page-about .about-tl__name {
  margin: 8px 0 0;
  font-size: clamp(16px, 1.5vw, 20px);
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-tl__text {
  margin: 8px 0 0;
  max-width: 44em;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(232, 241, 255, 0.72);
}

/* ============ 合作与认可 ============ */
.page-about .about-partners {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-partner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  padding: 18px 20px;
  background: rgba(18, 48, 94, 0.45);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
  transition: background 0.28s var(--ease);
}

.page-about .about-partner:hover {
  background: rgba(0, 255, 170, 0.1);
}

.page-about .about-partner__v {
  flex: 0 0 auto;
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 700;
  line-height: 1;
  color: var(--sand);
}

.page-about .about-partner__l {
  flex: 1 1 12em;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(232, 241, 255, 0.82);
}

/* ============ 下一步 ============ */
.page-about .about-next {
  position: relative;
  padding: clamp(56px, 8vw, 120px) 0 clamp(64px, 9vw, 130px);
  background: linear-gradient(160deg, var(--navy-deep) 0%, var(--navy) 70%);
  border-top: 1px solid rgba(30, 74, 138, 0.6);
}

.page-about .about-next__title {
  margin: 12px 0 0;
  font-size: clamp(24px, 3.8vw, 42px);
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-next__text {
  margin-top: 18px;
}

.page-about .about-next__links {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-route {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 22px;
  border: 1px solid rgba(30, 74, 138, 0.8);
  background: rgba(10, 31, 68, 0.6);
  text-decoration: none;
  clip-path: polygon(14px 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%, 0 14px);
  transition: border-color 0.28s var(--ease), transform 0.28s var(--ease), background 0.28s var(--ease);
}

.page-about .about-route:hover,
.page-about .about-route:focus-visible {
  border-color: var(--neon);
  transform: translateY(-4px);
  background: rgba(0, 255, 170, 0.08);
}

.page-about .about-route__t {
  font-size: clamp(17px, 1.5vw, 20px);
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-route:hover .about-route__t {
  color: var(--neon);
}

.page-about .about-route__d {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ============ 响应式 ============ */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-stats__item {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-next__links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 62fr 38fr;
    align-items: end;
  }

  .page-about .about-chapter__inner {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
  }

  .page-about .about-chapter__rail {
    position: sticky;
    top: 118px;
    align-self: start;
  }

  .page-about .about-chapter__num {
    margin-left: -0.14em;
  }

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

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

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

@media (min-width: 1200px) {
  .page-about .about-hero__title {
    max-width: 16em;
  }

  .page-about .about-facts {
    gap: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-facts__item,
  .page-about .about-flow__step,
  .page-about .about-tl,
  .page-about .about-tl__mark,
  .page-about .about-bar__fill,
  .page-about .about-route {
    transition: none;
  }

  .page-about .about-facts__item:hover,
  .page-about .about-flow__step:hover,
  .page-about .about-tl:hover,
  .page-about .about-route:hover {
    transform: none;
  }
}