.page-about {
  --rail: 34px;
  --dot: 12px;
  position: relative;
}

@media (min-width: 768px) {
  .page-about {
    --rail: 56px;
    --dot: 14px;
  }
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: 26px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 36px 0 52px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -160px;
  right: -150px;
  width: 460px;
  height: 460px;
  background: radial-gradient(circle at 50% 50%, rgba(108, 75, 232, 0.4), rgba(108, 75, 232, 0) 64%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -180px;
  bottom: -220px;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle at 50% 50%, rgba(46, 242, 224, 0.16), rgba(46, 242, 224, 0) 66%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: 34px;
}

.page-about .about-hero__title {
  margin: 16px 0 18px;
  font-size: clamp(2rem, 8vw, 3.35rem);
  font-weight: 200;
  line-height: 1.08;
  letter-spacing: 0.012em;
  color: var(--white);
}

.page-about .about-hero__lede {
  max-width: 48ch;
  margin: 0;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--gray);
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 1px;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-fact {
  display: grid;
  grid-template-columns: minmax(78px, auto) minmax(0, 1fr);
  align-items: baseline;
  gap: 4px 16px;
  padding: 16px 18px;
  background: var(--ink-800);
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 600;
  line-height: 1.1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

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

.page-about .about-fact__cap {
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--gray);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 56px;
    align-items: center;
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  position: relative;
  padding: 46px 0;
}

@media (min-width: 768px) {
  .page-about .about-section {
    padding: 68px 0;
  }
}

/* ---------- 错位双栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: 28px;
  margin-top: 30px;
}

.page-about .about-split__text p {
  margin: 0 0 16px;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--gray);
}

.page-about .about-split__text p:first-child {
  color: var(--white);
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  }
}

/* ---------- 图片与图注 ---------- */
.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure .media {
  display: block;
}

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

.page-about .about-figure figcaption {
  margin-top: 12px;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--gray-dim);
}

/* ---------- 流程小卡 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 20px 0 0;
  padding: 1px;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-flow__step {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 0 14px;
  padding: 14px 16px;
  background: var(--ink-800);
  transition: background-color var(--dur) var(--ease);
}

.page-about .about-flow__step:hover {
  background: var(--ink-700);
}

.page-about .about-flow__idx {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
  padding-top: 3px;
}

.page-about .about-flow__title {
  margin: 0 0 4px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--white);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--gray);
}

/* ---------- 发展历程时间轴 ---------- */
.page-about .about-timeline {
  margin-top: 34px;
}

.page-about .about-stage {
  position: relative;
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  gap: 0 16px;
  padding-bottom: 24px;
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: calc(var(--rail) / 2);
  top: 22px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--violet));
  opacity: 0.45;
}

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

.page-about .about-stage:last-child::before {
  display: none;
}

.page-about .about-stage__dot {
  width: var(--dot);
  height: var(--dot);
  margin-top: 9px;
  margin-left: calc((var(--rail) - var(--dot)) / 2);
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  box-shadow: var(--glow-cyan);
  position: relative;
  z-index: 1;
  transition: background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-stage:hover .about-stage__dot {
  background: var(--cyan);
  transform: scale(1.15);
}

.page-about .about-stage__body {
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  padding: 18px 20px;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-stage:hover .about-stage__body {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .about-stage__id {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--ice);
  text-transform: uppercase;
}

.page-about .about-stage__title {
  margin: 8px 0 10px;
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--white);
}

.page-about .about-stage__body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--gray);
}

.page-about .about-timeline__figure {
  margin: 4px 0 26px;
}

@media (min-width: 768px) {
  .page-about .about-timeline__figure {
    padding-left: calc(var(--rail) + 16px);
  }
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 16px;
  margin-top: 30px;
}

.page-about .about-partner {
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
}

.page-about .about-partner h3 {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--white);
}

.page-about .about-partner p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--gray);
}

@media (min-width: 760px) {
  .page-about .about-partners {
    grid-template-columns: 1.15fr 0.9fr 0.95fr;
    gap: 20px;
  }
}

.page-about .about-partners__foot {
  margin: 26px 0 0;
  padding: 18px 20px;
  border-left: 2px solid var(--violet);
  background: linear-gradient(90deg, rgba(108, 75, 232, 0.16), rgba(108, 75, 232, 0));
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--gray);
}

.page-about .about-partners__foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 242, 224, 0.4);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-partners__foot a:hover {
  color: var(--ice);
  border-color: var(--ice);
}

/* ---------- 服务网络 ---------- */
.page-about .about-network__body p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--gray);
}

.page-about .about-rhythm {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-rhythm li {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-rhythm li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .about-rhythm__num {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-rhythm__txt {
  font-size: 0.9375rem;
  line-height: 1.72;
  color: var(--gray);
}

/* ---------- 资质与安全 ---------- */
.page-about .about-trust {
  display: grid;
  gap: 18px;
  margin-top: 30px;
}

.page-about .about-trust__card {
  padding: 24px 22px;
  background: linear-gradient(155deg, var(--ink-800) 0%, rgba(10, 23, 51, 0.75) 100%);
}

.page-about .about-trust__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--green);
  margin-bottom: 10px;
}

.page-about .about-trust__card h3 {
  margin: 0 0 12px;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--white);
}

.page-about .about-trust__card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--gray);
}

@media (min-width: 820px) {
  .page-about .about-trust {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }
}

/* ---------- 收束 ---------- */
.page-about .about-closing {
  padding-bottom: 72px;
}

.page-about .about-closing__inner {
  position: relative;
  padding-top: 34px;
  border-top: 1px solid var(--line);
}

.page-about .about-closing__inner::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 88px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
}

.page-about .about-closing__title {
  margin: 0 0 14px;
  font-size: clamp(1.5rem, 5vw, 2.1rem);
  font-weight: 200;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-about .about-closing__text {
  margin: 0 0 24px;
  max-width: 56ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--gray);
}

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

/* ---------- 悬浮快捷入口 ---------- */
.page-about .about-quicklinks {
  display: none;
}

@media (min-width: 1180px) {
  .page-about .about-quicklinks {
    display: flex;
    flex-direction: column;
    gap: 8px;
    position: fixed;
    right: 22px;
    bottom: 34px;
    z-index: 20;
  }

  .page-about .about-quicklink {
    display: block;
    padding: 9px 14px;
    font-size: 0.8125rem;
    color: var(--gray);
    text-decoration: none;
    background: rgba(10, 23, 51, 0.92);
    border: 1px solid var(--line);
    border-radius: var(--radius-s);
    backdrop-filter: blur(6px);
    transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
  }

  .page-about .about-quicklink:hover,
  .page-about .about-quicklink:focus-visible {
    color: var(--cyan);
    border-color: var(--cyan);
    transform: translateY(-2px);
  }
}

/* ---------- 减动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-stage:hover .about-stage__body,
  .page-about .about-stage:hover .about-stage__dot,
  .page-about .about-quicklink:hover {
    transform: none;
  }
}