/* ===================== page-about ===================== */
.page-about {
  --ab-rail: 212px;
  --ab-flow-gap: 60px;
  position: relative;
  display: block;
  background: var(--c-void);
  overflow-x: clip;
}

.page-about p {
  margin: 0 0 16px;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--c-steel);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: 26px 0 0;
  background:
    radial-gradient(120% 92% at 88% -12%, rgba(122, 92, 255, .40) 0%, rgba(122, 92, 255, 0) 56%),
    radial-gradient(96% 88% at 4% 8%, rgba(34, 224, 255, .17) 0%, rgba(34, 224, 255, 0) 60%),
    linear-gradient(160deg, var(--c-void) 0%, var(--c-deep) 52%, var(--c-void) 100%);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg,
    rgba(34, 224, 255, 0) 0%,
    rgba(34, 224, 255, .55) 18%,
    rgba(122, 92, 255, .5) 62%,
    rgba(255, 107, 44, 0) 100%);
}

.page-about .ab-hero__wedge {
  position: absolute;
  top: -22%;
  right: -14%;
  width: min(60vw, 640px);
  height: 140%;
  background: linear-gradient(148deg,
    rgba(34, 224, 255, .15) 0%,
    rgba(122, 92, 255, .06) 46%,
    rgba(255, 107, 44, .16) 100%);
  clip-path: polygon(20% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .ab-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-bottom: 26px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-steel);
}

.page-about .ab-crumb a {
  color: var(--c-steel);
  text-decoration: none;
  transition: color .22s var(--ease);
}

.page-about .ab-crumb a:hover,
.page-about .ab-crumb a:focus-visible {
  color: var(--c-cyan);
}

.page-about .ab-crumb .breadcrumb__sep {
  color: var(--c-line);
}

.page-about .ab-hero__grid {
  position: relative;
  display: grid;
  gap: 30px;
  align-items: start;
  padding-bottom: 36px;
}

.page-about .ab-eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--c-cyan);
}

.page-about h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.2vw, 60px);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--c-white);
}

.page-about .ab-hero__lead {
  max-width: 46ch;
  margin: 0 0 24px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-steel);
}

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

.page-about .ab-hero__panel {
  position: relative;
  padding: 22px 22px 20px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: linear-gradient(150deg, rgba(16, 40, 74, .92) 0%, rgba(10, 27, 54, .74) 100%);
  box-shadow: var(--shadow-soft);
}

.page-about .ab-hero__panel::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  width: 3px;
  height: 34px;
  background: linear-gradient(180deg, var(--c-cyan), var(--c-violet));
}

.page-about .ab-hero__panelTitle {
  margin: 0 0 6px;
  font-size: 10.5px;
  letter-spacing: .26em;
  color: var(--c-steel);
}

.page-about .ab-hero__facts {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 15px;
}

.page-about .ab-hero__fact {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
}

.page-about .ab-hero__fact + .ab-hero__fact {
  border-top: 1px solid rgba(30, 58, 95, .72);
  padding-top: 15px;
}

.page-about .ab-hero__factNum {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--c-cyan);
  white-space: nowrap;
}

.page-about .ab-hero__fact:nth-child(2) .ab-hero__factNum {
  color: var(--c-orange);
}

.page-about .ab-hero__factText {
  font-size: 13px;
  line-height: 1.65;
  color: var(--c-steel);
}

.page-about .ab-hero__media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--c-deep);
  clip-path: polygon(0 1.8%, 100% 0, 100% 98.2%, 0 100%);
}

.page-about .ab-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(5, 11, 24, 0) 46%, rgba(5, 11, 24, .72) 100%);
}

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

/* ---------- 正文两栏 ---------- */
.page-about .ab-body {
  position: relative;
  padding: 46px 0 0;
  background: linear-gradient(180deg, var(--c-void) 0%, var(--c-deep) 26%, var(--c-void) 100%);
}

.page-about .ab-body__inner {
  display: grid;
  gap: 34px;
  min-width: 0;
  padding-bottom: 68px;
}

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

.page-about .ab-rail__label {
  margin: 0 0 14px;
  font-size: 10.5px;
  letter-spacing: .28em;
  color: var(--c-steel);
}

.page-about .ab-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border-left: 1px solid var(--c-line);
}

.page-about .ab-rail__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  font-size: 13.5px;
  line-height: 1.4;
  color: var(--c-steel);
  text-decoration: none;
  transition: color .22s var(--ease), background-color .22s var(--ease);
}

.page-about .ab-rail__link span {
  font-size: 10.5px;
  letter-spacing: .12em;
  color: var(--c-line);
  transition: color .22s var(--ease);
}

.page-about .ab-rail__link::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 50%;
  width: 2px;
  height: 0;
  transform: translateY(-50%);
  background: linear-gradient(180deg, var(--c-cyan), var(--c-violet));
  transition: height .26s var(--ease);
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  color: var(--c-white);
  background: rgba(34, 224, 255, .06);
}

.page-about .ab-rail__link:hover::before,
.page-about .ab-rail__link:focus-visible::before {
  height: 58%;
}

.page-about .ab-rail__link[aria-current="true"],
.page-about .ab-rail__link[aria-current="page"] {
  color: var(--c-cyan);
  background: rgba(34, 224, 255, .08);
}

.page-about .ab-rail__link[aria-current="true"] span,
.page-about .ab-rail__link[aria-current="page"] span {
  color: var(--c-orange);
}

.page-about .ab-rail__link[aria-current="true"]::before,
.page-about .ab-rail__link[aria-current="page"]::before {
  height: 76%;
}

/* ---------- 叙事流 ---------- */
.page-about .ab-flow {
  display: grid;
  gap: var(--ab-flow-gap);
  min-width: 0;
}

.page-about .ab-sec {
  position: relative;
  scroll-margin-top: 96px;
}

.page-about .ab-sec__head {
  display: grid;
  gap: 8px;
  margin-bottom: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(30, 58, 95, .6);
}

.page-about .ab-sec__index {
  margin: 0;
  font-size: 11px;
  letter-spacing: .26em;
  color: var(--c-orange);
}

.page-about .ab-sec h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.8vw, 34px);
  line-height: 1.22;
  letter-spacing: -.015em;
  color: var(--c-white);
}

.page-about .ab-sec > p.ab-sec__lead {
  margin: 0 0 18px;
  font-size: 16.5px;
  line-height: 1.82;
  color: var(--c-white);
  max-width: 60ch;
}

.page-about .ab-sec > *:last-child {
  margin-bottom: 0;
}

/* ---------- 价值主张 ---------- */
.page-about .ab-values {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-line);
  overflow: hidden;
}

.page-about .ab-value {
  position: relative;
  padding: 22px 20px 20px;
  background: linear-gradient(160deg, rgba(16, 40, 74, .9), rgba(10, 27, 54, .94));
}

.page-about .ab-value::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--c-cyan), rgba(34, 224, 255, 0));
  opacity: .7;
}

.page-about .ab-value:nth-child(2)::after {
  background: linear-gradient(90deg, var(--c-orange), rgba(255, 107, 44, 0));
}

.page-about .ab-value:nth-child(3)::after {
  background: linear-gradient(90deg, var(--c-violet), rgba(122, 92, 255, 0));
}

.page-about .ab-value:nth-child(4)::after {
  background: linear-gradient(90deg, var(--c-green), rgba(53, 227, 155, 0));
}

.page-about .ab-value__idx {
  display: block;
  margin-bottom: 12px;
  font-size: 10.5px;
  letter-spacing: .22em;
  color: var(--c-steel);
}

.page-about .ab-value__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.35;
  color: var(--c-white);
}

.page-about .ab-value p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--c-steel);
}

/* ---------- 内容能力数字 ---------- */
.page-about .ab-metrics {
  display: grid;
  gap: 16px;
  margin: 22px 0 26px;
}

.page-about .ab-metric {
  position: relative;
  padding: 24px 20px 20px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background:
    radial-gradient(124% 92% at 100% 0%, rgba(34, 224, 255, .15), rgba(34, 224, 255, 0) 62%),
    linear-gradient(160deg, rgba(16, 40, 74, .82), rgba(5, 11, 24, .92));
}

.page-about .ab-metric:nth-child(2) {
  background:
    radial-gradient(124% 92% at 100% 0%, rgba(255, 107, 44, .18), rgba(255, 107, 44, 0) 62%),
    linear-gradient(160deg, rgba(16, 40, 74, .82), rgba(5, 11, 24, .92));
}

.page-about .ab-metric:nth-child(3) {
  background:
    radial-gradient(124% 92% at 100% 0%, rgba(122, 92, 255, .22), rgba(122, 92, 255, 0) 62%),
    linear-gradient(160deg, rgba(16, 40, 74, .82), rgba(5, 11, 24, .92));
}

.page-about .ab-metric__idx {
  display: block;
  margin-bottom: 14px;
  font-size: 10.5px;
  letter-spacing: .22em;
  color: var(--c-steel);
}

.page-about .ab-metric__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(36px, 6vw, 50px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--c-cyan);
}

.page-about .ab-metric:nth-child(2) .ab-metric__num {
  color: var(--c-orange);
}

.page-about .ab-metric:nth-child(3) .ab-metric__num {
  color: #A38BFF;
}

.page-about .ab-metric__unit {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-white);
}

.page-about .ab-metric__desc {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--c-steel);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline__media {
  position: relative;
  margin: 0 0 30px;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--c-line);
  background: var(--c-deep);
}

.page-about .ab-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 6px 0 0 30px;
}

.page-about .ab-timeline__axis {
  position: absolute;
  left: 3px;
  top: 8px;
  width: 3px;
  height: calc(100% - 16px);
  display: block;
}

.page-about .ab-timeline__item {
  position: relative;
  padding-bottom: 30px;
}

.page-about .ab-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-void);
  border: 2px solid var(--c-cyan);
  box-shadow: 0 0 0 4px rgba(34, 224, 255, .12);
}

.page-about .ab-timeline__item:nth-child(3)::before {
  border-color: #7A5CFF;
  box-shadow: 0 0 0 4px rgba(122, 92, 255, .16);
}

.page-about .ab-timeline__item:nth-child(4)::before {
  border-color: var(--c-orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 44, .16);
}

.page-about .ab-timeline__item:nth-child(5)::before {
  border-color: var(--c-green);
  box-shadow: 0 0 0 4px rgba(53, 227, 155, .16);
  animation: abPulse 2.6s var(--ease) infinite;
}

@keyframes abPulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(53, 227, 155, .16); }
  50% { box-shadow: 0 0 0 8px rgba(53, 227, 155, .04); }
}

.page-about .ab-timeline__year {
  display: block;
  margin-bottom: 6px;
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--c-cyan);
}

.page-about .ab-timeline__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17.5px;
  line-height: 1.4;
  color: var(--c-white);
}

.page-about .ab-timeline__item h3 .tag {
  margin-left: 8px;
  vertical-align: middle;
}

.page-about .ab-timeline__item p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--c-steel);
}

/* ---------- 团队与协作 ---------- */
.page-about .ab-team {
  display: grid;
  gap: 24px;
  margin-top: 22px;
}

.page-about .ab-team__media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--c-line);
  background: var(--c-deep);
  clip-path: polygon(0 0, 100% 2.4%, 100% 100%, 0 97.6%);
}

.page-about .ab-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border-left: 1px solid var(--c-line);
}

.page-about .ab-role {
  position: relative;
  padding: 14px 0 14px 18px;
}

.page-about .ab-role::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 22px;
  width: 1px;
  height: 18px;
  background: var(--c-cyan);
}

.page-about .ab-role:nth-child(2)::before { background: var(--c-orange); }
.page-about .ab-role:nth-child(3)::before { background: #7A5CFF; }
.page-about .ab-role:nth-child(4)::before { background: var(--c-green); }

.page-about .ab-role__name {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 15.5px;
  color: var(--c-white);
}

.page-about .ab-role p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-steel);
}

/* ---------- 资质与服务 ---------- */
.page-about .ab-contact {
  margin: 22px 0 20px;
  padding: 0;
  display: grid;
  gap: 1px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-line);
  overflow: hidden;
}

.page-about .ab-contact__row {
  display: grid;
  gap: 6px;
  padding: 15px 18px;
  margin: 0;
  background: linear-gradient(150deg, rgba(16, 40, 74, .78), rgba(10, 27, 54, .9));
}

.page-about .ab-contact__row dt {
  font-size: 10.5px;
  letter-spacing: .22em;
  color: var(--c-steel);
}

.page-about .ab-contact__row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--c-white);
  word-break: break-word;
}

.page-about .ab-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}

/* ---------- 下一步 ---------- */
.page-about .ab-next {
  position: relative;
  overflow: hidden;
  padding: 32px 24px 28px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background:
    radial-gradient(112% 120% at 94% 0%, rgba(122, 92, 255, .34), rgba(122, 92, 255, 0) 58%),
    radial-gradient(94% 120% at 0% 100%, rgba(255, 107, 44, .2), rgba(255, 107, 44, 0) 62%),
    linear-gradient(150deg, rgba(16, 40, 74, .9), rgba(5, 11, 24, .94));
}

.page-about .ab-next::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 52%;
  height: 2px;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-violet), rgba(122, 92, 255, 0));
}

.page-about .ab-next__eyebrow {
  margin: 0 0 10px;
  font-size: 10.5px;
  letter-spacing: .26em;
  color: var(--c-cyan);
}

.page-about .ab-next h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(21px, 3.4vw, 30px);
  line-height: 1.26;
  color: var(--c-white);
}

.page-about .ab-next p {
  max-width: 62ch;
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--c-steel);
}

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

/* ---------- 返回顶部 ---------- */
.page-about .back-to-top {
  position: fixed;
  right: 18px;
  bottom: 22px;
  z-index: 40;
}

.page-about .back-to-top__arrow {
  display: block;
  font-size: 15px;
  line-height: 1;
}

/* ===================== 响应式 ===================== */
@media (min-width: 640px) {
  .page-about .ab-hero {
    padding-top: 32px;
  }

  .page-about .ab-contact__row {
    grid-template-columns: 132px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }

  .page-about .ab-contact__row dt {
    letter-spacing: .14em;
  }
}

@media (min-width: 720px) {
  .page-about .ab-values {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .ab-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, .88fr);
    gap: 52px;
    padding-bottom: 44px;
  }

  .page-about .ab-flow {
    --ab-flow-gap: 76px;
  }

  .page-about .ab-next {
    padding: 40px 40px 34px;
  }
}

@media (min-width: 1000px) {
  .page-about .ab-body {
    padding-top: 60px;
  }

  .page-about .ab-body__inner {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: 56px;
    padding-bottom: 88px;
  }

  .page-about .ab-rail {
    display: block;
    position: sticky;
    top: 88px;
    align-self: start;
  }

  .page-about .ab-sec__head {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }

  .page-about .ab-sec__index {
    padding-top: 6px;
  }
}

@media (min-width: 1240px) {
  .page-about {
    --ab-rail: 236px;
  }

  .page-about .ab-timeline {
    padding-left: 38px;
  }

  .page-about .ab-timeline__item::before {
    left: -39px;
  }

  .page-about .ab-timeline__axis {
    left: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-timeline__item:nth-child(5)::before {
    animation: none;
  }

  .page-about .ab-rail__link,
  .page-about .ab-rail__link::before {
    transition: none;
  }
}