.page-about {
  --about-index-w: 190px;
  color: var(--white);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 34px 0 66px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -160px;
  right: -14%;
  width: 78vw;
  max-width: 980px;
  height: 560px;
  background:
    radial-gradient(circle at 62% 42%, rgba(46, 242, 200, 0.16), transparent 62%),
    linear-gradient(122deg, rgba(255, 122, 46, 0.14), transparent 58%);
  transform: skewY(-7deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(30, 50, 72, 0.55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 50, 72, 0.55) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.45;
  -webkit-mask-image: radial-gradient(circle at 72% 24%, #000 0%, transparent 70%);
  mask-image: radial-gradient(circle at 72% 24%, #000 0%, transparent 70%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 40px;
}

.page-about .about-hero__copy h1 {
  margin: 14px 0 20px;
  font-family: var(--font-display);
  font-size: clamp(38px, 7vw, 74px);
  line-height: 1.05;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-hero__lead {
  margin: 0 0 26px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(245, 249, 255, 0.78);
}

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

.page-about .about-hero__visual {
  position: relative;
  display: grid;
  gap: 0;
}

.page-about .about-figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.page-about .about-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(6, 11, 20, 0.55), transparent 55%),
    repeating-linear-gradient(90deg, rgba(46, 242, 200, 0.09) 0 1px, transparent 1px 48px);
  pointer-events: none;
}

.page-about .about-figure__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure--wide {
  margin-bottom: 6px;
}

.page-about .about-wall {
  position: relative;
  z-index: 2;
  width: calc(100% - 26px);
  margin: -46px 0 0 auto;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--cyan-line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.page-about .about-wall li {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 15px 16px;
  background: var(--glass);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.page-about .about-wall__num {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-wall__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 主体布局 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 26px;
  padding-bottom: 44px;
}

.page-about .about-index__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--ink-800);
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: color 180ms ease, border-color 180ms ease, background-color 180ms ease;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--white);
  border-color: var(--cyan-line);
  background: var(--cyan-soft);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding: 46px 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 96px;
}

.page-about .about-body > .about-section:first-child {
  border-top: 0;
  padding-top: 4px;
}

.page-about .about-section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 24px;
}

.page-about .about-section__num {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.16em;
  color: var(--cyan);
  border: 1px solid var(--cyan-line);
  border-radius: 999px;
  padding: 2px 10px;
}

.page-about .about-section__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(23px, 3.6vw, 34px);
  line-height: 1.22;
  font-weight: 800;
  letter-spacing: -0.015em;
  color: var(--white);
}

.page-about .about-section__lead {
  margin: 0 0 24px;
  max-width: 36em;
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(245, 249, 255, 0.7);
}

.page-about .prose p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(245, 249, 255, 0.8);
}

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

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

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

.page-about .about-prose--tight {
  margin-top: 22px;
}

.page-about .about-caption {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .about-split {
  display: grid;
  gap: 26px;
}

.page-about .about-split--after {
  margin-top: 26px;
}

.page-about .about-aside {
  align-self: start;
  padding: 22px;
  border-radius: var(--radius);
  background: var(--glass);
  border: 1px solid var(--cyan-line);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow);
}

.page-about .about-aside__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-aside ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-aside li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.65;
  color: rgba(245, 249, 255, 0.75);
}

.page-about .about-aside li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--orange);
}

/* ---------- 四道手 ---------- */
.page-about .about-steps {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-steps li {
  position: relative;
  padding: 20px 20px 20px 60px;
  border-radius: var(--radius);
  background: var(--ink-800);
  border: 1px solid var(--line);
  transition: border-color 200ms ease, transform 200ms ease;
}

.page-about .about-steps li:hover {
  border-color: var(--cyan-line);
  transform: translateY(-2px);
}

.page-about .about-steps__num {
  position: absolute;
  left: 20px;
  top: 21px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-steps h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

.page-about .about-steps p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(245, 249, 255, 0.7);
}

/* ---------- 覆盖数据 ---------- */
.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-metrics li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 18px 16px;
  background: var(--ink-800);
}

.page-about .about-metrics__num {
  font-family: var(--font-mono);
  font-size: clamp(23px, 3vw, 30px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-metrics__num--cyan {
  color: var(--cyan);
}

.page-about .about-metrics__num--orange {
  color: var(--orange);
}

.page-about .about-metrics__num--violet {
  color: var(--violet);
}

.page-about .about-metrics__label {
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team li {
  display: grid;
  gap: 8px;
}

.page-about .about-team__name {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--white);
}

.page-about .about-team__bar {
  display: block;
  height: 8px;
  border-radius: 999px;
  background: rgba(30, 50, 72, 0.9);
  overflow: hidden;
}

.page-about .about-team__fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
}

.page-about .about-team__fill--a {
  width: 62%;
}

.page-about .about-team__fill--b {
  width: 24%;
}

.page-about .about-team__fill--c {
  width: 14%;
}

.page-about .about-team__value {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--muted);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 32px 0 14px;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
}

.page-about .about-timeline:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
  border-radius: var(--radius);
}

.page-about .about-timeline__track {
  position: relative;
  display: flex;
  gap: 14px;
  min-width: max-content;
  margin: 0;
  padding: 0 4px;
  list-style: none;
}

.page-about .about-timeline__track::before {
  content: "";
  position: absolute;
  top: -14px;
  left: 12px;
  right: 12px;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--cyan), var(--orange) 55%, var(--violet));
  opacity: 0.55;
}

.page-about .about-timeline__node {
  position: relative;
  flex: 0 0 auto;
  width: 235px;
  padding: 20px;
  border-radius: var(--radius);
  background: var(--ink-800);
  border: 1px solid var(--line);
  scroll-snap-align: start;
  transition: border-color 200ms ease, transform 200ms ease, box-shadow 200ms ease;
}

.page-about .about-timeline__node::before {
  content: "";
  position: absolute;
  top: -19px;
  left: 22px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(46, 242, 200, 0.12);
}

.page-about .about-timeline__node:hover {
  border-color: rgba(46, 242, 200, 0.42);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--orange);
}

.page-about .about-timeline__node h3 {
  margin: 6px 0 8px;
  font-size: 16px;
  line-height: 1.45;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-timeline__node p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.68;
  color: var(--muted);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 26px;
}

.page-about .about-partners__text {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(245, 249, 255, 0.76);
}

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

.page-about .about-nodes li {
  padding: 13px 14px 11px;
  border-radius: var(--radius-sm);
  background: var(--ink-800);
  border: 1px solid var(--line);
  transition: border-color 200ms ease, background-color 200ms ease;
}

.page-about .about-nodes li:hover {
  border-color: rgba(167, 139, 250, 0.5);
  background: var(--violet-soft);
}

.page-about .about-nodes__name {
  display: block;
  margin-bottom: 3px;
  font-size: 13.5px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--white);
}

.page-about .about-nodes__type {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--violet);
}

.page-about .about-proof {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-proof li {
  padding-left: 13px;
  border-left: 2px solid var(--cyan);
}

.page-about .about-proof strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-proof span {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  margin-top: 30px;
  padding: 32px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--cyan-line);
  background:
    radial-gradient(circle at 92% 0%, rgba(255, 122, 46, 0.16), transparent 58%),
    linear-gradient(135deg, rgba(46, 242, 200, 0.12), rgba(13, 23, 38, 0.9) 62%);
  display: grid;
  gap: 22px;
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(21px, 3vw, 27px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-cta__desc {
  margin: 0;
  max-width: 40em;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(245, 249, 255, 0.76);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-team li {
    grid-template-columns: 112px minmax(0, 1fr) 44px;
    align-items: center;
    gap: 14px;
  }

  .page-about .about-proof {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .about-hero {
    padding: 46px 0 80px;
  }

  .page-about .about-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 38px 34px;
  }
}

@media (min-width: 880px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.85fr) minmax(0, 1fr);
    gap: 38px;
  }

  .page-about .about-partners {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 38px;
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
    gap: 52px;
  }

  .page-about .about-hero__visual {
    transform: translateY(-8px);
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    gap: 46px;
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-index__link {
    position: relative;
    padding: 9px 0 9px 14px;
    border: 0;
    border-radius: 0;
    background: none;
    white-space: normal;
    line-height: 1.5;
  }

  .page-about .about-index__link::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: transparent;
    transition: background-color 180ms ease;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    background: none;
  }

  .page-about .about-index__link:hover::before,
  .page-about .about-index__link:focus-visible::before {
    background: var(--cyan);
  }

  .page-about .about-section {
    padding: 56px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-steps li,
  .page-about .about-timeline__node,
  .page-about .about-index__link,
  .page-about .about-nodes li {
    transition: none;
  }

  .page-about .about-steps li:hover,
  .page-about .about-timeline__node:hover {
    transform: none;
  }
}