.page-about {
  padding-inline: 6vw;
  padding-top: clamp(16px, 2.5vw, 30px);
  padding-bottom: clamp(64px, 9vw, 120px);
  font-family: var(--body);
  color: var(--ink);
  overflow-x: clip;
}

@media (max-width: 680px) {
  .page-about {
    padding-inline: 20px;
  }
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(22px, 3vw, 40px);
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--ink-2);
}

.page-about .about-crumb a {
  color: var(--ink-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-crumb a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-crumb span[aria-hidden] {
  color: var(--indigo-600);
}

.page-about .about-crumb__here {
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(20px, 3.5vw, 48px) clamp(34px, 5vw, 68px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -4%;
  right: -6vw;
  width: min(58%, 760px);
  height: 84%;
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(63, 240, 216, .18), transparent 62%),
    linear-gradient(210deg, rgba(139, 108, 246, .16), transparent 68%);
  clip-path: polygon(22% 0, 100% 0, 100% 100%, 0 74%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__head {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 4vw, 56px);
}

@media (min-width: 940px) {
  .page-about .about-hero__head {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: end;
  }
}

.page-about .about-hero h1 {
  margin: 14px 0 20px;
  font-family: var(--head);
  font-weight: 900;
  font-size: clamp(34px, 5.4vw, 62px);
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .about-lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.35vw, 18px);
  line-height: 1.85;
  color: var(--ink-2);
}

.page-about .about-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__facts {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--indigo-600);
  border: 1px solid var(--indigo-600);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-hero__facts > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  background: var(--indigo-900);
}

.page-about .about-hero__facts dt {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--ink-2);
}

.page-about .about-hero__facts dd {
  margin: 0;
  font-family: var(--mono);
  font-size: 20px;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .about-hero__figure {
  position: relative;
  z-index: 1;
  margin: clamp(34px, 5vw, 64px) 0 0;
  border: 1px solid var(--indigo-600);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--indigo-900);
}

@media (min-width: 900px) {
  .page-about .about-hero__figure {
    transform: rotate(-1deg);
  }
}

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

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
  margin-top: clamp(44px, 6vw, 92px);
}

@media (min-width: 1040px) {
  .page-about .about-body {
    grid-template-columns: minmax(180px, 220px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
  }
}

.page-about .about-rail .px-toc__title {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ink-2);
}

.page-about .about-rail ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-rail .px-toc__link {
  display: block;
  padding: 9px 0 9px 14px;
  border-left: 2px solid var(--indigo-600);
  color: var(--ink-2);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.5;
  transition: color .2s var(--ease), border-color .2s var(--ease), padding-left .2s var(--ease);
}

.page-about .about-rail .px-toc__link:hover {
  color: var(--ink);
  border-left-color: var(--cyan-700);
}

.page-about .about-rail .px-toc__link[aria-current="true"] {
  color: var(--cyan);
  border-left-color: var(--cyan);
  padding-left: 18px;
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  scroll-margin-top: 96px;
  padding-block: clamp(42px, 6vw, 84px);
}

.page-about .about-sec + .about-sec {
  border-top: 1px solid var(--indigo-600);
}

.page-about .about-sec__grid {
  display: grid;
  gap: clamp(14px, 2vw, 26px);
}

@media (min-width: 800px) {
  .page-about .about-sec__grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    gap: clamp(24px, 3.5vw, 60px);
  }
}

.page-about .about-label {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-note {
  margin: 0;
  max-width: 30ch;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .about-sec__title {
  margin: 0 0 20px;
  font-family: var(--head);
  font-weight: 800;
  font-size: clamp(25px, 3vw, 36px);
  line-height: 1.28;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .about-prose {
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink-2);
}

.page-about .about-prose p {
  margin: 0 0 1.05em;
}

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

.page-about .about-prose--tight {
  margin-bottom: clamp(22px, 3vw, 34px);
}

/* ---------- 版本演进 ---------- */
.page-about .about-vervisual {
  margin: 0 0 clamp(30px, 4vw, 52px);
  border: 1px solid var(--indigo-600);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--indigo-900);
}

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

.page-about .about-tl {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--cyan-700) 42%, rgba(63, 240, 216, .12));
}

.page-about .about-tl__item {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 33vh;
  padding-left: 34px;
  padding-bottom: clamp(28px, 3.5vw, 46px);
}

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

.page-about .about-tl__dot {
  position: absolute;
  left: 0;
  top: 50%;
  width: 11px;
  height: 11px;
  margin-top: -5.5px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(245, 185, 74, .14);
}

.page-about .about-tl__ver {
  margin: 0 0 6px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .16em;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .about-tl__title {
  margin: 0 0 10px;
  font-family: var(--head);
  font-weight: 800;
  font-size: clamp(20px, 2.4vw, 26px);
  line-height: 1.35;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .about-tl__text {
  margin: 0 0 12px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-2);
}

.page-about .about-tl__gain {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-size: 14px;
  color: var(--ink);
}

@media (max-width: 799px) {
  .page-about .about-tl__item {
    min-height: 0;
    justify-content: flex-start;
    padding-bottom: 34px;
  }

  .page-about .about-tl__dot {
    top: 8px;
    margin-top: 0;
  }
}

/* ---------- 运转方式 ---------- */
.page-about .about-pillars {
  list-style: none;
  margin: 0 0 clamp(26px, 3.5vw, 44px);
  padding: 0;
  display: grid;
  gap: 18px;
}

@media (min-width: 880px) {
  .page-about .about-pillars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-pillars__item {
  padding: 22px 20px 20px 22px;
  border: 1px solid var(--indigo-600);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius-sm);
  background: linear-gradient(180deg, rgba(29, 36, 86, .85), rgba(20, 26, 69, .55));
  transition: box-shadow .22s var(--ease), border-color .22s var(--ease);
}

.page-about .about-pillars__item:nth-child(2) {
  border-left-color: var(--gold);
}

.page-about .about-pillars__item:nth-child(3) {
  border-left-color: var(--violet);
}

.page-about .about-pillars__item:hover {
  box-shadow: 2px 2px 0 rgba(63, 240, 216, .25);
}

.page-about .about-pillars__name {
  margin: 0 0 10px;
  font-family: var(--head);
  font-weight: 800;
  font-size: 19px;
  color: var(--ink);
}

.page-about .about-pillars__text {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .about-pillars__nums {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
}

.page-about .about-pillars__nums span {
  padding: 4px 10px;
  border: 1px solid var(--indigo-600);
  border-radius: 99px;
  background: rgba(11, 16, 48, .6);
  font-family: var(--mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .about-rhythm {
  margin-bottom: clamp(24px, 3.5vw, 40px);
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--indigo-600);
  border-radius: var(--radius);
  background: var(--indigo-900);
}

.page-about .about-rhythm__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 18px;
}

.page-about .about-rhythm__title {
  margin: 0;
  font-family: var(--head);
  font-weight: 800;
  font-size: 18px;
  color: var(--ink);
}

.page-about .about-rhythm__meta {
  margin: 0;
  font-family: var(--mono);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  letter-spacing: .08em;
  color: var(--gold);
}

.page-about .about-ticks {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 5px;
  margin-bottom: 16px;
}

.page-about .about-ticks i {
  display: block;
  height: 34px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--cyan), var(--cyan-700));
  opacity: .82;
}

.page-about .about-ticks i:nth-child(3n) {
  background: linear-gradient(180deg, var(--gold), #c9901f);
}

.page-about .about-rhythm__note {
  margin: 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-2);
}

@media (max-width: 560px) {
  .page-about .about-ticks {
    gap: 3px;
  }

  .page-about .about-ticks i {
    height: 26px;
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team__visual {
  display: grid;
  gap: clamp(24px, 3vw, 40px);
  margin-bottom: clamp(30px, 4vw, 48px);
}

@media (min-width: 860px) {
  .page-about .about-team__visual {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: center;
  }
}

.page-about .about-donut {
  text-align: center;
}

.page-about .about-donut__ring {
  position: relative;
  width: min(220px, 62vw);
  aspect-ratio: 1 / 1;
  margin: 0 auto 22px;
  border-radius: 50%;
  background: conic-gradient(
    var(--cyan) 0deg 132deg,
    var(--gold) 132deg 240deg,
    var(--violet) 240deg 360deg
  );
}

.page-about .about-donut__ring::after {
  content: "";
  position: absolute;
  inset: 27%;
  border-radius: 50%;
  background: var(--indigo-950);
  border: 1px solid var(--indigo-600);
}

.page-about .about-donut__center {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.page-about .about-donut__center strong {
  font-family: var(--mono);
  font-size: 30px;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

.page-about .about-donut__center small {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--ink-2);
}

.page-about .about-legend {
  list-style: none;
  display: grid;
  gap: 10px;
  max-width: 320px;
  margin: 0 auto;
  padding: 0;
  text-align: left;
}

.page-about .about-legend li {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--ink-2);
}

.page-about .about-legend i {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .about-legend li:nth-child(2) i {
  background: var(--gold);
}

.page-about .about-legend li:nth-child(3) i {
  background: var(--violet);
}

.page-about .about-legend em {
  font-style: normal;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

.page-about .about-team__figure {
  margin: 0;
  border: 1px solid var(--indigo-600);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--indigo-900);
}

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

.page-about .about-team__figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--indigo-600);
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-2);
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

@media (min-width: 760px) {
  .page-about .about-steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 16px;
  }
}

.page-about .about-steps li {
  position: relative;
  padding-top: 16px;
  border-top: 2px solid var(--indigo-600);
}

.page-about .about-steps li::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  width: 32px;
  height: 2px;
  background: var(--cyan);
}

.page-about .about-steps__n {
  display: block;
  margin-bottom: 6px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .about-steps__name {
  margin: 0 0 6px;
  font-family: var(--head);
  font-weight: 800;
  font-size: 16px;
  color: var(--ink);
}

.page-about .about-steps__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ink-2);
}

/* ---------- 服务覆盖 ---------- */
.page-about .about-metrics {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: 0 0 clamp(24px, 3.5vw, 40px);
  padding: 0;
  background: var(--indigo-600);
  border: 1px solid var(--indigo-600);
  border-radius: var(--radius);
  overflow: hidden;
}

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

.page-about .about-metrics__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(18px, 2.5vw, 26px);
  background: var(--indigo-900);
}

.page-about .about-metrics__num {
  margin: 0;
  font-family: var(--mono);
  font-size: clamp(26px, 3.4vw, 36px);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .about-metrics__item:nth-child(2n) .about-metrics__num {
  color: var(--gold);
}

.page-about .about-metrics__label {
  margin: 0;
  font-size: 13.5px;
  letter-spacing: .04em;
  color: var(--ink-2);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  list-style: none;
  display: grid;
  gap: 18px;
  margin: 0 0 clamp(26px, 4vw, 44px);
  padding: 0;
}

@media (min-width: 820px) {
  .page-about .about-next {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-next li {
  padding-left: 16px;
  border-left: 2px solid var(--indigo-600);
}

.page-about .about-next h3 {
  margin: 0 0 8px;
  font-family: var(--head);
  font-weight: 800;
  font-size: 17px;
  color: var(--ink);
}

.page-about .about-next p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .about-outro {
  display: grid;
  gap: 18px;
  margin-top: clamp(30px, 4vw, 52px);
  padding: clamp(24px, 3.5vw, 38px);
  border: 1px solid var(--indigo-600);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(63, 240, 216, .12), transparent 58%),
    var(--indigo-800);
}

@media (min-width: 760px) {
  .page-about .about-outro {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 28px;
  }
}

.page-about .about-outro__text {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-2);
}

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

/* ---------- 进入视口轻浮起 ---------- */
.page-about [data-reveal].is-in {
  animation: aboutRise .34s var(--ease) both;
}

@keyframes aboutRise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }

  to {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal].is-in {
    animation: none;
  }

  .page-about .about-hero__figure {
    transform: none;
  }
}