.page-about {
  --ab-railw: 148px;
  --ab-asidew: 220px;
  background:
    radial-gradient(880px 460px at 12% 0%, rgba(43, 184, 255, 0.10), transparent 62%),
    radial-gradient(640px 400px at 92% 16%, rgba(0, 239, 196, 0.07), transparent 66%);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: 30px 0 0;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(680px 360px at 74% 12%, rgba(0, 239, 196, 0.13), transparent 64%);
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 2;
}

.page-about .ab-hero__title {
  margin: 16px 0 0;
  font-family: var(--ly-font-display);
  font-size: clamp(2.3rem, 6.6vw, 4.5rem);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: 0.005em;
  color: var(--ly-ink);
}

.page-about .ab-hero__lead {
  max-width: 48ch;
  margin: 20px 0 0;
  font-size: 1.02rem;
  line-height: 1.78;
  color: var(--ly-text);
}

.page-about .ab-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-hero__facts li {
  padding-left: 11px;
  border-left: 2px solid rgba(0, 239, 196, 0.45);
  font-family: var(--ly-font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.07em;
  color: var(--ly-cyan);
  line-height: 1.5;
}

.page-about .ab-hero__media {
  position: relative;
  margin: 32px 0 0;
  border-radius: var(--ly-radius);
  overflow: hidden;
  border: 1px solid rgba(23, 58, 90, 0.9);
  background: linear-gradient(120deg, rgba(8, 38, 60, 0.9), rgba(5, 19, 31, 0.95));
}

.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  opacity: 0.44;
  filter: saturate(0.85) contrast(1.08);
}

.page-about .ab-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5, 19, 31, 0.05) 0%, rgba(5, 19, 31, 0.86) 100%);
  pointer-events: none;
}

/* ---------- 主体骨架 ---------- */
.page-about .ab-body {
  display: grid;
  gap: 26px;
  padding-top: 44px;
  padding-bottom: 76px;
}

@media (min-width: 1024px) {
  .page-about .ab-body {
    grid-template-columns: var(--ab-railw) minmax(0, 1fr) var(--ab-asidew);
    gap: 40px;
    align-items: start;
  }
}

/* ---------- 阶段导轨 ---------- */
.page-about .ab-rail {
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .ab-rail__title {
  display: none;
  margin: 0 0 12px;
  font-family: var(--ly-font-display);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ly-text);
  opacity: 0.75;
}

.page-about .ab-rail__list {
  display: flex;
  gap: 9px;
  margin: 0;
  padding: 0 2px 8px;
  list-style: none;
}

.page-about .ab-rail__link {
  display: inline-block;
  white-space: nowrap;
  padding: 7px 14px;
  border: 1px solid var(--ly-line);
  border-radius: 999px;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  color: var(--ly-text);
  text-decoration: none;
  transition: color var(--ly-dur) ease, border-color var(--ly-dur) ease, background var(--ly-dur) ease;
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  color: var(--ly-cyan);
  border-color: rgba(0, 239, 196, 0.5);
  background: rgba(0, 239, 196, 0.07);
}

@media (min-width: 1024px) {
  .page-about .ab-rail {
    position: sticky;
    top: 84px;
    overflow: visible;
  }

  .page-about .ab-rail__title {
    display: block;
  }

  .page-about .ab-rail__list {
    flex-direction: column;
    gap: 0;
    padding: 0;
  }

  .page-about .ab-rail__link {
    position: relative;
    display: block;
    padding: 11px 0 11px 24px;
    border: 0;
    border-radius: 0;
    background: none;
    font-size: 0.76rem;
    letter-spacing: 0.08em;
  }

  .page-about .ab-rail__link::before {
    content: "";
    position: absolute;
    left: 5px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--ly-line);
  }

  .page-about .ab-rail__link::after {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 11px;
    height: 11px;
    margin-top: -5.5px;
    border-radius: 50%;
    background: var(--ly-deep);
    border: 2px solid rgba(0, 239, 196, 0.65);
    transition: background var(--ly-dur) ease, border-color var(--ly-dur) ease;
  }

  .page-about .ab-rail__link:hover::after,
  .page-about .ab-rail__link:focus-visible::after {
    background: var(--ly-cyan);
    border-color: var(--ly-cyan);
  }
}

/* ---------- 章节 ---------- */
.page-about .ab-sec {
  position: relative;
  padding: 26px 0 30px;
  border-top: 1px solid rgba(23, 58, 90, 0.72);
}

.page-about .ab-sec:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .ab-sec:nth-of-type(even)::before {
  content: "";
  position: absolute;
  left: -22px;
  right: -22px;
  top: 0;
  bottom: 0;
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(11, 35, 56, 0.5), rgba(11, 35, 56, 0.06));
  pointer-events: none;
  z-index: 0;
}

.page-about .ab-sec > * {
  position: relative;
  z-index: 1;
}

.page-about .ab-sec__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 16px;
}

.page-about .ab-sec__num {
  flex: none;
  padding: 3px 9px;
  border: 1px solid rgba(0, 239, 196, 0.35);
  border-radius: 999px;
  font-family: var(--ly-font-mono);
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--ly-cyan);
}

.page-about .ab-sec__title {
  margin: 0;
  font-family: var(--ly-font-display);
  font-size: clamp(1.35rem, 3.4vw, 2.05rem);
  font-weight: 700;
  line-height: 1.24;
  color: var(--ly-ink);
}

/* ---------- 路径列表 ---------- */
.page-about .ab-routes {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-route + .ab-route {
  border-top: 1px solid rgba(23, 58, 90, 0.6);
}

.page-about .ab-route__link {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  grid-template-areas:
    "arrow name"
    "arrow desc";
  gap: 3px 12px;
  padding: 15px 6px;
  text-decoration: none;
  border-radius: 10px;
  transition: background var(--ly-dur) ease;
}

.page-about .ab-route__link:hover,
.page-about .ab-route__link:focus-visible {
  background: rgba(0, 239, 196, 0.07);
}

.page-about .ab-route__arrow {
  grid-area: arrow;
  align-self: start;
  font-size: 1rem;
  line-height: 1.3;
  color: var(--ly-blue);
  transition: color var(--ly-dur) ease, transform var(--ly-dur) ease;
}

.page-about .ab-route__link:hover .ab-route__arrow,
.page-about .ab-route__link:focus-visible .ab-route__arrow {
  color: var(--ly-cyan);
  transform: translateX(4px);
}

.page-about .ab-route__name {
  grid-area: name;
  font-family: var(--ly-font-display);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--ly-ink);
}

.page-about .ab-route__desc {
  grid-area: desc;
  font-size: 0.86rem;
  line-height: 1.66;
  color: var(--ly-text);
}

/* ---------- 数字块 ---------- */
.page-about .ab-figures {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 12px;
  margin-top: 22px;
}

.page-about .ab-figure {
  padding: 16px 16px 14px;
  border-radius: 12px;
  border: 1px solid rgba(43, 184, 255, 0.24);
  background: linear-gradient(160deg, rgba(43, 184, 255, 0.13), rgba(11, 35, 56, 0.5));
}

.page-about .ab-figure:nth-child(2) {
  border-color: rgba(0, 239, 196, 0.26);
  background: linear-gradient(160deg, rgba(0, 239, 196, 0.12), rgba(11, 35, 56, 0.5));
}

.page-about .ab-figure:nth-child(3) {
  border-color: rgba(255, 122, 47, 0.3);
  background: linear-gradient(160deg, rgba(255, 122, 47, 0.14), rgba(11, 35, 56, 0.5));
}

.page-about .ab-figure__num {
  display: block;
  font-family: var(--ly-font-mono);
  font-size: 1.95rem;
  font-weight: 600;
  line-height: 1;
  color: var(--ly-ink);
}

.page-about .ab-figure__num em {
  font-style: normal;
  font-size: 0.9rem;
  color: var(--ly-cyan);
  margin-left: 1px;
}

.page-about .ab-figure__label {
  display: block;
  margin-top: 9px;
  font-size: 0.77rem;
  letter-spacing: 0.07em;
  color: var(--ly-text);
}

/* ---------- 流程步骤 ---------- */
.page-about .ab-steps {
  display: grid;
  gap: 2px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-step {
  display: grid;
  grid-template-columns: 50px minmax(0, 1fr);
  gap: 14px;
  padding: 15px 14px;
  border-radius: 12px;
  transition: background var(--ly-dur) ease;
}

.page-about .ab-step:hover {
  background: rgba(0, 239, 196, 0.07);
}

.page-about .ab-step__num {
  font-family: var(--ly-font-mono);
  font-size: 1.45rem;
  font-weight: 600;
  line-height: 1.15;
  color: rgba(0, 239, 196, 0.68);
  transition: color var(--ly-dur) ease;
}

.page-about .ab-step:hover .ab-step__num {
  color: var(--ly-ink);
}

.page-about .ab-step__title {
  margin: 0;
  font-family: var(--ly-font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--ly-ink);
  transition: color var(--ly-dur) ease;
}

.page-about .ab-step:hover .ab-step__title {
  color: var(--ly-cyan);
}

.page-about .ab-step__text {
  margin: 6px 0 0;
  font-size: 0.88rem;
  line-height: 1.72;
  color: var(--ly-text);
}

/* ---------- 图文容器 ---------- */
.page-about .ab-team__media,
.page-about .ab-stage__media {
  margin: 22px 0 24px;
  border-radius: var(--ly-radius);
  overflow: hidden;
  border: 1px solid rgba(23, 58, 90, 0.85);
  background: linear-gradient(140deg, rgba(11, 35, 56, 0.9), rgba(5, 19, 31, 0.95));
}

.page-about .ab-team__media img,
.page-about .ab-stage__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  opacity: 0.72;
  filter: saturate(0.9);
}

.page-about .ab-team__media .ly-media__caption,
.page-about .ab-stage__media .ly-media__caption {
  display: block;
  padding: 11px 15px;
  font-size: 0.77rem;
  line-height: 1.65;
  color: var(--ly-text);
  background: rgba(5, 19, 31, 0.65);
  border-top: 1px solid rgba(23, 58, 90, 0.7);
}

/* ---------- 团队分工 ---------- */
.page-about .ab-teams {
  display: grid;
  gap: 12px;
  margin-top: 4px;
}

@media (min-width: 768px) {
  .page-about .ab-teams {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .ab-team {
  padding: 16px 16px 18px;
  border-radius: 12px;
  border: 1px solid var(--ly-line);
  background: linear-gradient(170deg, rgba(11, 35, 56, 0.85), rgba(5, 19, 31, 0.6));
}

.page-about .ab-team__name {
  margin: 0;
  font-family: var(--ly-font-display);
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--ly-ink);
}

.page-about .ab-team__name::before {
  content: "";
  display: block;
  width: 18px;
  height: 2px;
  margin-bottom: 10px;
  background: var(--ly-cyan);
}

.page-about .ab-team__text {
  margin: 9px 0 0;
  font-size: 0.86rem;
  line-height: 1.72;
  color: var(--ly-text);
}

.page-about .ab-note {
  margin: 18px 0 0;
  padding: 13px 16px;
  border-left: 2px solid var(--ly-warn);
  border-radius: 0 10px 10px 0;
  background: rgba(255, 210, 74, 0.07);
  font-size: 0.87rem;
  line-height: 1.72;
  color: var(--ly-ink);
}

/* ---------- 演进阶段 ---------- */
.page-about .ab-stages {
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-stage {
  position: relative;
  padding: 0 0 24px 26px;
  border-left: 1px solid var(--ly-line);
}

.page-about .ab-stage:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .ab-stage::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ly-cyan);
  box-shadow: 0 0 0 4px rgba(0, 239, 196, 0.13);
}

.page-about .ab-stage__idx {
  display: block;
  font-family: var(--ly-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--ly-blue);
}

.page-about .ab-stage__name {
  margin: 7px 0 0;
  font-family: var(--ly-font-display);
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--ly-ink);
}

.page-about .ab-stage__text {
  margin: 7px 0 0;
  max-width: 52ch;
  font-size: 0.87rem;
  line-height: 1.72;
  color: var(--ly-text);
}

/* ---------- 合作条带 ---------- */
.page-about .ab-strip {
  display: flex;
  gap: 10px;
  margin: 22px 0 0;
  padding: 4px 2px 12px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  -webkit-mask-image: linear-gradient(90deg, #000 0, #000 90%, transparent 100%);
  mask-image: linear-gradient(90deg, #000 0, #000 90%, transparent 100%);
}

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

.page-about .ab-strip__item {
  flex: 0 0 auto;
  scroll-snap-align: start;
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid var(--ly-line);
  background: rgba(11, 35, 56, 0.62);
  font-size: 0.82rem;
  white-space: nowrap;
  color: var(--ly-text);
  transition: color var(--ly-dur) ease, border-color var(--ly-dur) ease;
}

.page-about .ab-strip__item:hover {
  color: var(--ly-cyan);
  border-color: rgba(0, 239, 196, 0.45);
}

@media (min-width: 768px) {
  .page-about .ab-strip {
    flex-wrap: wrap;
    overflow: visible;
    padding: 0;
    -webkit-mask-image: none;
    mask-image: none;
  }
}

/* ---------- 服务与支持 ---------- */
.page-about .ab-service {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}

@media (min-width: 640px) {
  .page-about .ab-service {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .ab-service__block {
  padding: 16px 16px 18px;
  border-radius: 12px;
  border: 1px solid rgba(43, 184, 255, 0.22);
  background: linear-gradient(165deg, rgba(43, 184, 255, 0.09), rgba(11, 35, 56, 0.55));
}

.page-about .ab-service__label {
  margin: 0 0 10px;
  font-family: var(--ly-font-display);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ly-cyan);
}

.page-about .ab-service__line {
  margin: 0 0 6px;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--ly-ink);
  word-break: break-word;
}

.page-about .ab-service__line:last-child {
  margin-bottom: 0;
}

.page-about .ab-service__cta {
  margin: 18px 0 0;
  font-size: 0.89rem;
  line-height: 1.8;
  color: var(--ly-text);
}

.page-about .ab-service__cta a {
  color: var(--ly-blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 184, 255, 0.4);
  transition: color var(--ly-dur) ease, border-color var(--ly-dur) ease;
}

.page-about .ab-service__cta a:hover,
.page-about .ab-service__cta a:focus-visible {
  color: var(--ly-cyan);
  border-color: var(--ly-cyan);
}

/* ---------- 规模面板 ---------- */
.page-about .ab-metrics {
  position: relative;
  overflow: hidden;
  padding: 18px 18px 20px;
  border-radius: var(--ly-radius);
  border: 1px solid var(--ly-line);
  background: linear-gradient(165deg, rgba(11, 35, 56, 0.95), rgba(5, 19, 31, 0.92));
}

.page-about .ab-metrics::before {
  content: "";
  position: absolute;
  top: -46px;
  right: -46px;
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 239, 196, 0.26), transparent 70%);
  pointer-events: none;
}

.page-about .ab-metrics__title {
  position: relative;
  margin: 0 0 14px;
  font-family: var(--ly-font-display);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ly-text);
}

.page-about .ab-metrics__list {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 16px;
}

@media (min-width: 1024px) {
  .page-about .ab-metrics {
    position: sticky;
    top: 84px;
  }

  .page-about .ab-metrics__list {
    grid-template-columns: minmax(0, 1fr);
    gap: 15px;
  }
}

.page-about .ab-metric {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .ab-metric .ly-metric__value {
  display: block;
  font-family: var(--ly-font-mono);
  font-size: 1.55rem;
  font-weight: 600;
  line-height: 1.05;
  color: var(--ly-ink);
}

.page-about .ab-metric .ly-metric__value em {
  font-style: normal;
  font-size: 0.78rem;
  margin-left: 2px;
  color: var(--ly-cyan);
}

.page-about .ab-metric .ly-metric__label {
  display: block;
  font-size: 0.73rem;
  letter-spacing: 0.09em;
  line-height: 1.5;
  color: var(--ly-text);
}

@media (min-width: 1280px) {
  .page-about .ab-metric .ly-metric__value {
    font-size: 1.8rem;
  }
}