.page-about {
  --about-toc-w: 250px;
  --about-rail-gap: 48px;
  position: relative;
  padding-bottom: 80px;
  color: var(--white);
  font-family: var(--font-body);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 26px 0 52px;
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -12% auto -12%;
  height: 150%;
  pointer-events: none;
  background:
    radial-gradient(56% 68% at 84% 4%, rgba(63, 240, 214, .18), transparent 62%),
    radial-gradient(46% 60% at 6% 0%, rgba(255, 79, 163, .14), transparent 66%),
    radial-gradient(72% 58% at 52% 108%, rgba(255, 194, 75, .08), transparent 72%);
}

.page-about .about-crumb {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 26px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--mist);
}

.page-about .about-crumb a {
  color: var(--cyan);
  text-decoration: none;
}

.page-about .about-crumb a:hover {
  text-decoration: underline;
}

.page-about .about-crumb-sep {
  color: var(--line-strong);
}

.page-about .about-hero-grid {
  position: relative;
  display: grid;
  gap: 30px;
}

.page-about .about-h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 7.4vw, 64px);
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--white);
  max-width: 16ch;
}

.page-about .about-lead {
  margin: 20px 0 0;
  max-width: 62ch;
  color: rgba(234, 242, 255, .8);
}

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

.page-about .about-hero-media {
  margin: 0;
  aspect-ratio: 3 / 2;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  overflow: hidden;
  box-shadow: var(--shadow-deep);
}

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 40px 0 72px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .84fr);
    align-items: end;
    gap: 56px;
  }
}

/* ---------- 正文骨架 ---------- */
.page-about .about-body {
  padding-top: 34px;
}

.page-about .about-body-inner {
  display: grid;
  gap: 30px;
}

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

/* ---------- 章节目录 ---------- */
.page-about .about-toc {
  position: sticky;
  top: 0;
  z-index: 4;
  padding: 8px 0 10px;
  background: linear-gradient(180deg, var(--ink) 74%, rgba(11, 16, 32, 0));
}

.page-about .about-toc-label {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-about .about-toc-list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: none;
}

.page-about .about-toc-list::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc-link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--ink-2);
  color: var(--mist);
  font-size: 13px;
  line-height: 1.3;
  text-decoration: none;
  white-space: nowrap;
  transition: color .22s var(--ease), border-color .22s var(--ease), background .22s var(--ease);
}

.page-about .about-toc-num {
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .about-toc-link.is-active,
.page-about .about-toc-link[aria-current] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-toc-link.is-active .about-toc-num,
.page-about .about-toc-link[aria-current] .about-toc-num {
  color: rgba(11, 16, 32, .72);
}

@media (min-width: 1024px) {
  .page-about .about-toc {
    padding: 0;
    background: none;
  }

  .page-about .about-toc-label {
    margin-bottom: 12px;
  }

  .page-about .about-toc-list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-toc-link {
    position: relative;
    border: 0;
    border-radius: 0;
    background: none;
    padding: 10px 12px;
    font-size: 14px;
    white-space: normal;
  }

  .page-about .about-toc-link:hover {
    color: var(--white);
  }

  .page-about .about-toc-link.is-active,
  .page-about .about-toc-link[aria-current] {
    color: var(--cyan);
    background: linear-gradient(90deg, rgba(63, 240, 214, .12), rgba(63, 240, 214, 0));
  }

  .page-about .about-toc-link.is-active .about-toc-num,
  .page-about .about-toc-link[aria-current] .about-toc-num {
    color: var(--cyan);
  }

  .page-about .about-toc-link::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 9px;
    bottom: 9px;
    width: 2px;
    background: transparent;
    transition: background .24s var(--ease);
  }

  .page-about .about-toc-link.is-active::before,
  .page-about .about-toc-link[aria-current]::before {
    background: var(--cyan);
  }
}

/* ---------- 章节 ---------- */
.page-about .about-content {
  min-width: 0;
}

.page-about .about-sec {
  padding-bottom: 52px;
  scroll-margin-top: 88px;
}

.page-about .about-sec + .about-sec::before {
  content: "";
  display: block;
  height: 1px;
  margin: 0 0 46px;
  background: linear-gradient(90deg, rgba(63, 240, 214, .55), rgba(255, 79, 163, .3) 46%, rgba(234, 242, 255, 0) 96%);
}

.page-about .about-sec-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 18px;
}

.page-about .about-sec-num {
  padding: 3px 9px;
  border: 1px solid rgba(63, 240, 214, .34);
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .about-sec-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(22px, 3.6vw, 32px);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-about .about-sec-body > p {
  margin: 0 0 16px;
  max-width: 70ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(234, 242, 255, .86);
}

.page-about .about-inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 240, 214, .38);
  transition: border-color .2s var(--ease);
}

.page-about .about-inline-link:hover {
  border-color: var(--cyan);
}

@media (min-width: 768px) {
  .page-about .about-sec-body > p {
    font-size: 16px;
  }
}

/* ---------- 业务分类 ---------- */
.page-about .about-pillars {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.page-about .about-pillar {
  position: relative;
  overflow: hidden;
  padding: 18px 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(158deg, rgba(30, 39, 69, .92), rgba(18, 26, 51, .92));
}

.page-about .about-pillar::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), rgba(63, 240, 214, 0));
}

.page-about .about-pillar:nth-child(2)::after {
  background: linear-gradient(90deg, var(--magenta), rgba(255, 79, 163, 0));
}

.page-about .about-pillar:nth-child(3)::after {
  background: linear-gradient(90deg, var(--amber), rgba(255, 194, 75, 0));
}

.page-about .about-pillar h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .about-pillar p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

@media (min-width: 640px) {
  .page-about .about-pillars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 团队结构 ---------- */
.page-about .about-team {
  display: grid;
  gap: 24px;
  margin-top: 26px;
  padding: 24px 20px 26px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background:
    radial-gradient(88% 130% at 10% 0%, rgba(63, 240, 214, .1), transparent 62%),
    var(--ink-2);
}

.page-about .about-team-item {
  text-align: center;
}

.page-about .about-team-dot {
  display: grid;
  place-items: center;
  margin: 0 auto 12px;
  border-radius: 50%;
  border: 1px solid rgba(63, 240, 214, .34);
  background: radial-gradient(circle at 32% 26%, rgba(63, 240, 214, .48), rgba(15, 143, 122, .14) 62%, rgba(15, 143, 122, 0) 76%);
}

.page-about .about-team-item--dev .about-team-dot {
  width: 118px;
  height: 118px;
}

.page-about .about-team-item--edit .about-team-dot {
  width: 96px;
  height: 96px;
  border-color: rgba(255, 79, 163, .36);
  background: radial-gradient(circle at 32% 26%, rgba(255, 79, 163, .42), rgba(255, 79, 163, .1) 62%, rgba(255, 79, 163, 0) 76%);
}

.page-about .about-team-item--cs .about-team-dot {
  width: 76px;
  height: 76px;
  border-color: rgba(255, 194, 75, .38);
  background: radial-gradient(circle at 32% 26%, rgba(255, 194, 75, .42), rgba(255, 194, 75, .1) 62%, rgba(255, 194, 75, 0) 76%);
}

.page-about .about-team-num {
  font-size: 27px;
  font-weight: 700;
  line-height: 1;
  color: var(--white);
}

.page-about .about-team-item--edit .about-team-num {
  font-size: 22px;
}

.page-about .about-team-item--cs .about-team-num {
  font-size: 19px;
}

.page-about .about-team-role {
  margin: 0 0 4px;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .about-team-desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

@media (min-width: 720px) {
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: end;
    gap: 18px;
  }
}

/* ---------- 流程配图 ---------- */
.page-about .about-flow-media {
  margin: 22px 0 24px;
  aspect-ratio: 16 / 9;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  overflow: hidden;
}

/* ---------- 四步流程 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 10px;
}

.page-about .about-step {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--ink-2);
  overflow: hidden;
  transition: border-color .24s var(--ease), background .24s var(--ease);
}

.page-about .about-step[data-open] {
  border-color: rgba(63, 240, 214, .38);
  background: linear-gradient(154deg, rgba(30, 39, 69, .96), rgba(18, 26, 51, .96));
}

.page-about .about-step-head {
  margin: 0;
}

.page-about .about-step-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 16px;
  border: 0;
  background: none;
  color: var(--white);
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
}

.page-about .about-step-num {
  padding: 2px 7px;
  border: 1px solid rgba(63, 240, 214, .32);
  border-radius: 6px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .about-step-title {
  flex: 1;
}

.page-about .about-step-icon {
  position: relative;
  flex: 0 0 auto;
  width: 12px;
  height: 12px;
}

.page-about .about-step-icon::before,
.page-about .about-step-icon::after {
  content: "";
  position: absolute;
  border-radius: 2px;
  background: var(--mist);
  transition: transform .24s var(--ease), background .24s var(--ease);
}

.page-about .about-step-icon::before {
  left: 0;
  top: 5px;
  width: 12px;
  height: 2px;
}

.page-about .about-step-icon::after {
  left: 5px;
  top: 0;
  width: 2px;
  height: 12px;
}

.page-about .about-step[data-open] .about-step-icon::before {
  background: var(--cyan);
}

.page-about .about-step[data-open] .about-step-icon::after {
  transform: scaleY(0);
}

.page-about .about-step-panel {
  display: block;
  padding: 0 16px 18px;
}

.page-about .js .about-step-panel {
  display: none;
}

.page-about .js .about-step[data-open] .about-step-panel {
  display: block;
}

.page-about .about-step-panel p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: rgba(234, 242, 255, .82);
}

/* ---------- 内容合作 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 24px;
  margin-top: 8px;
}

.page-about .about-partner-stat {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px dashed var(--line);
}

.page-about .about-partner-num {
  flex: 0 0 auto;
  min-width: 62px;
  font-size: 30px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--amber);
}

.page-about .about-partner-label {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(234, 242, 255, .82);
}

.page-about .about-partners-note {
  margin: 18px 0 10px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-partners-copy p:last-child {
  margin: 0;
}

.page-about .about-partners-media {
  margin: 0;
  aspect-ratio: 4 / 3;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  overflow: hidden;
}

@media (min-width: 860px) {
  .page-about .about-partners {
    grid-template-columns: minmax(0, 1fr) minmax(0, .92fr);
    align-items: center;
    gap: 36px;
  }
}

/* ---------- 版本演进线 ---------- */
.page-about .about-track {
  position: relative;
  list-style: none;
  margin: 26px 0 30px;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, rgba(63, 240, 214, .8), rgba(255, 194, 75, .7));
}

.page-about .about-track-item {
  position: relative;
  padding-left: 26px;
}

.page-about .about-track-item::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 22px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(63, 240, 214, .16);
}

.page-about .about-track-item:last-child::before {
  background: var(--amber);
  box-shadow: 0 0 0 3px rgba(255, 194, 75, .18);
}

.page-about .about-track-link {
  display: block;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(18, 26, 51, .74);
  color: inherit;
  text-decoration: none;
  transition: border-color .24s var(--ease), transform .24s var(--ease), background .24s var(--ease);
}

.page-about .about-track-link:hover {
  border-color: rgba(63, 240, 214, .4);
  background: rgba(30, 39, 69, .82);
}

.page-about .about-track-ver {
  display: block;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-about .about-track-season {
  display: block;
  margin: 4px 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--mist);
}

.page-about .about-track-txt {
  display: block;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(234, 242, 255, .82);
}

@media (min-width: 840px) {
  .page-about .about-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    padding-top: 42px;
    margin-bottom: 34px;
  }

  .page-about .about-track::before {
    left: 24px;
    right: 24px;
    top: 8px;
    bottom: auto;
    width: auto;
    height: 1px;
    background: linear-gradient(90deg, rgba(63, 240, 214, .16), rgba(63, 240, 214, .75) 52%, rgba(255, 194, 75, .75));
  }

  .page-about .about-track-item {
    padding-left: 0;
  }

  .page-about .about-track-item::before {
    left: 22px;
    top: -38px;
  }
}

/* ---------- 能力指标 ---------- */
.page-about .about-caps {
  display: grid;
  gap: 14px;
}

.page-about .about-cap {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(30, 39, 69, .86), rgba(11, 16, 32, .86));
  scroll-margin-top: 100px;
}

.page-about .about-cap-num {
  display: block;
  margin-bottom: 8px;
  font-size: 28px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--amber);
}

.page-about .about-cap h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .about-cap p {
  margin: 0;
  font-size: 13.8px;
  line-height: 1.72;
  color: var(--mist);
}

@media (min-width: 900px) {
  .page-about .about-caps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 使用场景 ---------- */
.page-about .about-scenes {
  display: grid;
  gap: 14px;
  margin: 22px 0 24px;
}

.page-about .about-scene {
  padding: 4px 0 4px 16px;
  border-left: 2px solid rgba(63, 240, 214, .48);
}

.page-about .about-scene:nth-child(2) {
  border-left-color: rgba(255, 79, 163, .48);
}

.page-about .about-scene:nth-child(3) {
  border-left-color: rgba(255, 194, 75, .5);
}

.page-about .about-scene-time {
  display: block;
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--mist);
}

.page-about .about-scene p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(234, 242, 255, .86);
}

@media (min-width: 760px) {
  .page-about .about-scenes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

.page-about .about-related {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

/* ---------- 结尾引导 ---------- */
.page-about .about-cta {
  margin-top: 4px;
  padding: 30px 22px 32px;
  border: 1px solid rgba(63, 240, 214, .24);
  border-radius: var(--r-lg);
  background:
    radial-gradient(88% 140% at 6% 0%, rgba(63, 240, 214, .14), transparent 62%),
    radial-gradient(72% 120% at 100% 100%, rgba(255, 79, 163, .12), transparent 66%),
    var(--ink-2);
}

.page-about .about-cta-title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(20px, 3.4vw, 27px);
  line-height: 1.18;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-about .about-cta-text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.76;
  color: rgba(234, 242, 255, .82);
}

.page-about .about-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

@media (min-width: 768px) {
  .page-about .about-cta {
    padding: 38px 34px 40px;
  }
}

/* ---------- 显现动画 ---------- */
.page-about .reveal {
  transition: opacity .3s var(--ease), transform .3s var(--ease);
}

.page-about.js .reveal,
.js .page-about .reveal {
  opacity: 0;
  transform: translateY(8px);
}

.page-about.js .reveal.is-in,
.js .page-about .reveal.is-in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .reveal,
  .page-about .reveal.is-in {
    opacity: 1;
    transform: none;
    transition: none;
  }
}