.page-about {
  --about-rail-w: 190px;
  --about-paper-line: rgba(20, 24, 31, .12);
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-about [id] {
  scroll-margin-top: 120px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding-top: clamp(16px, 3vw, 28px);
  padding-bottom: clamp(20px, 4vw, 38px);
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--muted);
}

.page-about .breadcrumbs a {
  color: var(--nebula-soft);
  text-decoration: none;
  transition: color .2s var(--ease);
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--volt);
}

.page-about .breadcrumbs__sep {
  opacity: .5;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-bottom: clamp(34px, 5vw, 58px);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  max-width: 20ch;
  font-size: clamp(2rem, 5.4vw, 4.1rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--frost);
}

.page-about .about-hero h1 em {
  font-style: normal;
  color: var(--flame);
}

.page-about .about-hero__lead {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  max-width: 66ch;
  font-size: clamp(15.5px, 1.4vw, 17px);
  line-height: 1.9;
  color: rgba(232, 238, 249, .82);
}

.page-about .about-hero__figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-hero__figures li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  background: var(--ink-module);
}

.page-about .about-hero__num {
  font-size: clamp(1.2rem, 2.3vw, 1.7rem);
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--volt);
}

.page-about .about-hero__unit {
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--muted);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 44px);
}

.page-about .about-flow {
  display: grid;
  gap: clamp(38px, 5vw, 66px);
  min-width: 0;
}

/* ---------- 左侧迷你时间轴 ---------- */
.page-about .about-rail__title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--muted);
}

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

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--nebula), rgba(109, 63, 196, .06));
}

.page-about .about-track__item + .about-track__item {
  margin-top: 2px;
}

.page-about .about-track__link {
  position: relative;
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr);
  grid-template-areas:
    "dot num"
    "dot name";
  column-gap: 12px;
  padding: 7px 10px 7px 0;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: background .22s var(--ease);
}

.page-about .about-track__link:hover,
.page-about .about-track__link:focus-visible {
  background: rgba(169, 139, 245, .1);
}

.page-about .about-track__dot {
  grid-area: dot;
  width: 11px;
  height: 11px;
  margin-top: 5px;
  border-radius: 50%;
  border: 1.5px solid var(--nebula-soft);
  background: var(--ink-deep);
  transition: background .24s var(--ease), border-color .24s var(--ease), box-shadow .24s var(--ease);
}

.page-about .about-track__link:hover .about-track__dot,
.page-about .about-track__link:focus-visible .about-track__dot {
  background: var(--flame);
  border-color: var(--flame);
  box-shadow: 0 0 0 4px rgba(255, 122, 41, .18);
}

.page-about .about-track__num {
  grid-area: num;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--volt);
}

.page-about .about-track__name {
  grid-area: name;
  font-size: 14px;
  line-height: 1.4;
  color: var(--frost);
}

/* ---------- 章节通用 ---------- */
.page-about .about-h2 {
  margin: 0;
  font-size: clamp(1.5rem, 3.1vw, 2.3rem);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -.02em;
  color: var(--frost);
}

.page-about .about-section__lead {
  margin: 12px 0 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(232, 238, 249, .78);
}

/* ---------- 编年史 ---------- */
.page-about .about-banner {
  margin: 0 0 clamp(22px, 3.2vw, 34px);
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
}

.page-about .about-chapter__lead {
  margin: 14px 0 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.9;
  color: rgba(232, 238, 249, .78);
}

.page-about .about-stages {
  display: grid;
  gap: 14px;
  margin-top: clamp(22px, 3.2vw, 34px);
}

.page-about .about-stage {
  position: relative;
  padding: clamp(18px, 2.6vw, 28px) clamp(18px, 2.6vw, 30px);
  border-radius: var(--radius);
  border: 1px solid var(--about-paper-line);
  background: var(--paper);
  color: var(--ink);
  box-shadow: 0 12px 28px rgba(4, 8, 22, .34);
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px solid rgba(20, 24, 31, .1);
  border-radius: calc(var(--radius) - 7px);
  pointer-events: none;
}

.page-about .about-stage__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  margin-bottom: 10px;
}

.page-about .about-stage__no {
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--nebula);
}

.page-about .about-stage__title {
  margin: 0;
  font-size: clamp(1.02rem, 1.8vw, 1.28rem);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .about-stage__range {
  margin-left: auto;
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(20, 24, 31, .48);
}

.page-about .about-stage__text {
  position: relative;
  margin: 0;
  font-family: var(--font-serif);
  font-size: 15.5px;
  line-height: 1.92;
  color: rgba(20, 24, 31, .88);
}

/* ---------- 档案流程 ---------- */
.page-about .about-process {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.6vw, 40px);
  margin-top: clamp(22px, 3.2vw, 32px);
}

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

.page-about .about-step {
  position: relative;
  padding-left: 52px;
}

.page-about .about-step__no {
  position: absolute;
  left: 0;
  top: 0;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: rgba(42, 212, 224, .07);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--volt);
}

.page-about .about-step h3 {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--frost);
}

.page-about .about-step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: rgba(232, 238, 249, .74);
}

.page-about .about-process__media {
  margin: 0;
}

.page-about .about-process__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
}

.page-about .about-process__note {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 14px 18px;
  border-left: 3px solid var(--flame);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: rgba(255, 122, 41, .09);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--frost);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 12px;
  margin-top: clamp(22px, 3.2vw, 32px);
}

.page-about .about-team__item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-module);
  overflow: hidden;
  transition: border-color .24s var(--ease);
}

.page-about .about-team__item[open] {
  border-color: rgba(42, 212, 224, .42);
}

.page-about .about-team__trigger {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px clamp(16px, 2.4vw, 22px);
  list-style: none;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 700;
  color: var(--frost);
}

.page-about .about-team__trigger::-webkit-details-marker {
  display: none;
}

.page-about .about-team__trigger:focus-visible {
  outline: 2px solid var(--volt);
  outline-offset: -3px;
  border-radius: var(--radius);
}

.page-about .about-team__count {
  margin-left: auto;
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--volt);
}

.page-about .about-team__icon {
  position: relative;
  flex: 0 0 14px;
  width: 14px;
  height: 14px;
}

.page-about .about-team__icon::before,
.page-about .about-team__icon::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1.5px;
  border-radius: 2px;
  background: var(--nebula-soft);
  transition: transform .24s var(--ease);
}

.page-about .about-team__icon::after {
  transform: rotate(90deg);
}

.page-about .about-team__item[open] .about-team__icon::after {
  transform: rotate(0deg);
}

.page-about .about-team__panel {
  padding: 16px clamp(16px, 2.4vw, 22px) clamp(18px, 2.4vw, 24px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-team__panel p {
  margin: 0;
  font-size: 14.8px;
  line-height: 1.85;
  color: rgba(232, 238, 249, .76);
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(22px, 3.2vw, 32px);
}

.page-about .about-partner {
  padding: clamp(20px, 2.4vw, 24px);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: linear-gradient(158deg, rgba(109, 63, 196, .2), rgba(22, 34, 77, .92));
}

.page-about .about-partner__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 4vw, 2.8rem);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--flame);
}

.page-about .about-partner__unit {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: .09em;
  color: var(--muted);
}

.page-about .about-partner p {
  margin: 14px 0 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: rgba(232, 238, 249, .76);
}

/* ---------- 纹理分隔带 ---------- */
.page-about .about-ripple {
  margin: 0;
}

.page-about .about-ripple img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
  opacity: .92;
}

/* ---------- 里程碑 ---------- */
.page-about .about-milestones {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(22px, 3.2vw, 32px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-milestones li {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 20px;
  background: var(--ink-module);
}

.page-about .about-milestones span {
  font-size: clamp(1.15rem, 2vw, 1.4rem);
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--volt);
}

.page-about .about-milestones p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(232, 238, 249, .78);
}

/* ---------- 结尾引导 ---------- */
.page-about .about-cta {
  position: relative;
  padding: clamp(28px, 4vw, 48px);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background:
    radial-gradient(120% 140% at 10% 0%, rgba(109, 63, 196, .36), transparent 62%),
    linear-gradient(140deg, var(--ink-module), var(--ink-deep));
  overflow: hidden;
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  left: 38%;
  right: -12%;
  bottom: -70%;
  height: 220px;
  background: radial-gradient(closest-side, rgba(42, 212, 224, .24), transparent);
  pointer-events: none;
}

.page-about .about-cta .about-h2,
.page-about .about-cta p,
.page-about .about-cta__actions,
.page-about .about-cta__links {
  position: relative;
}

.page-about .about-cta p {
  max-width: 60ch;
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.88;
  color: rgba(232, 238, 249, .82);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-cta__links {
  margin: 18px 0 0;
  font-size: 14px;
  color: var(--muted);
}

.page-about .about-cta__links a {
  color: var(--nebula-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(169, 139, 245, .5);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-cta__links a:hover,
.page-about .about-cta__links a:focus-visible {
  color: var(--volt);
  border-color: var(--volt);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-hero__figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-process {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    align-items: start;
  }

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

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(36px, 4.5vw, 64px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 108px;
    align-self: start;
  }
}

@media (min-width: 1180px) {
  .page-about .about-milestones {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-track__link,
  .page-about .about-track__dot,
  .page-about .about-team__item,
  .page-about .about-team__icon::before,
  .page-about .about-team__icon::after,
  .page-about .about-cta__links a {
    transition: none;
  }
}