.page-about {
  --about-rail-w: 208px;
}

/* ---------- 面包屑与首屏 ---------- */
.page-about .breadcrumb {
  padding: 22px 0 4px;
}

.page-about .about-hero {
  display: grid;
  gap: 30px;
  padding: 18px 0 52px;
}

.page-about .about-hero__copy h1 {
  margin: 10px 0 0;
  font-size: clamp(2rem, 5.4vw, 3.35rem);
  line-height: 1.1;
  letter-spacing: -.025em;
  font-weight: 900;
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 40em;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--ink-2);
}

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

/* 首屏纯 CSS 视觉 */
.page-about .viz {
  position: relative;
  overflow: hidden;
  padding: 20px 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 80% at 88% 0%, rgba(46, 107, 255, .22), transparent 62%),
    linear-gradient(180deg, rgba(35, 224, 200, .08), transparent 70%),
    var(--panel);
}

.page-about .viz::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(180deg, rgba(237, 243, 248, .05) 0 1px, transparent 1px 4px);
}

.page-about .viz__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-about .viz__title {
  font-size: .8125rem;
  letter-spacing: .16em;
  color: var(--ink-2);
}

.page-about .viz__pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--lime);
  animation: about-pulse 2.4s var(--ease) infinite;
}

@keyframes about-pulse {
  0%, 100% { opacity: .35; transform: scale(.85); }
  50% { opacity: 1; transform: scale(1); }
}

.page-about .viz__rows {
  margin-top: 6px;
}

.page-about .viz__row {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--line);
}

.page-about .viz__label {
  font-size: .8125rem;
  color: var(--ink-2);
}

.page-about .viz__bar {
  display: block;
  height: 8px;
  border-radius: 4px;
  background: var(--blue);
}

.page-about .viz__row:nth-child(1) .viz__bar { width: 82%; background: var(--blue); }
.page-about .viz__row:nth-child(2) .viz__bar { width: 66%; background: var(--cyan); }
.page-about .viz__row:nth-child(3) .viz__bar { width: 91%; background: var(--orange); }
.page-about .viz__row:nth-child(4) .viz__bar { width: 54%; background: var(--magenta); }

.page-about .viz__foot {
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .02em;
  color: var(--ink-2);
}

/* ---------- 双列主体 ---------- */
.page-about .about-body {
  display: grid;
  gap: 16px;
  padding-bottom: 76px;
}

.page-about .about-rail {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-about .about-rail__title {
  margin: 0 0 10px;
  font-size: .75rem;
  letter-spacing: .18em;
  color: var(--ink-2);
}

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

.page-about .about-rail__item {
  position: relative;
}

.page-about .about-rail__link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 0;
  font-size: .875rem;
  line-height: 1.4;
  color: var(--ink-2);
  text-decoration: none;
  transition: color .22s var(--ease);
}

.page-about .about-rail__link::before {
  content: "";
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--bg);
  transition: border-color .22s var(--ease), background .22s var(--ease), box-shadow .22s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--ink);
}

.page-about .about-rail__link:hover::before,
.page-about .about-rail__link:focus-visible::before {
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(35, 224, 200, .16);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding: 0 0 46px;
  margin-bottom: 46px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-sec:last-of-type {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-about .sec-head {
  display: grid;
  gap: 10px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  margin-bottom: 22px;
}

.page-about .sec-tag {
  font-size: .75rem;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .sec-head h2 {
  margin: 0;
  font-size: clamp(1.4rem, 2.8vw, 1.95rem);
  line-height: 1.28;
  letter-spacing: -.015em;
  font-weight: 800;
}

.page-about .sub-head {
  margin: 34px 0 0;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
  font-size: 1rem;
  font-weight: 800;
  color: var(--ink);
}

.page-about .sec-note {
  margin: 22px 0 0;
  font-size: .875rem;
  line-height: 1.72;
  color: var(--ink-2);
}

.page-about .sec-note a,
.page-about .tool-block a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 107, 255, .45);
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

.page-about .sec-note a:hover,
.page-about .tool-block a:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 图片 ---------- */
.page-about .media {
  margin: 24px 0;
}

.page-about .media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
}

.page-about .about-banner {
  margin-top: 0;
}

/* ---------- 四类内容 ---------- */
.page-about .offer-grid {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .offer-item {
  padding: 18px 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  transition: transform .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .offer-item:hover {
  transform: translateY(-4px);
  border-color: var(--cyan);
  box-shadow: 0 14px 32px rgba(0, 0, 0, .32);
}

.page-about .offer-item__num {
  font-size: .75rem;
  letter-spacing: .14em;
  color: var(--orange);
}

.page-about .offer-item__title {
  margin: 8px 0 8px;
  font-size: 1.0625rem;
  font-weight: 800;
}

.page-about .offer-item__desc {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.72;
  color: var(--ink-2);
}

/* ---------- 场景列表 ---------- */
.page-about .scene-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .scene-list li {
  position: relative;
  padding-left: 24px;
  font-size: .9375rem;
  line-height: 1.72;
  color: var(--ink-2);
}

.page-about .scene-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: .72em;
  width: 10px;
  height: 2px;
  background: var(--orange);
}

/* ---------- 数据条 ---------- */
.page-about .databar {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(90deg, rgba(46, 107, 255, .12), rgba(35, 224, 200, .06) 48%, transparent 88%);
  display: grid;
}

.page-about .databar__item {
  padding: 15px 18px;
  display: grid;
  gap: 4px;
}

.page-about .databar__item + .databar__item {
  border-top: 1px solid var(--line);
}

.page-about .databar__value {
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .databar__caption {
  font-size: .8125rem;
  line-height: 1.5;
  color: var(--ink-2);
}

/* ---------- 数据流程 ---------- */
.page-about .flow-steps {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .flow-steps li {
  display: grid;
  grid-template-columns: 82px minmax(0, 1fr);
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  font-size: .9375rem;
  line-height: 1.72;
  color: var(--ink-2);
}

.page-about .flow-steps__n {
  font-size: .8125rem;
  letter-spacing: .1em;
  color: var(--cyan);
  line-height: 2;
}

/* ---------- 工具 ---------- */
.page-about .tools-layout {
  display: grid;
  gap: 22px;
}

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

.page-about .tool-block h3 {
  margin: 0 0 8px;
  font-size: 1.0625rem;
  font-weight: 800;
}

.page-about .tool-block p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.78;
  color: var(--ink-2);
}

.page-about .tools-figure {
  margin: 0;
}

/* ---------- 版本时间轴 ---------- */
.page-about .version-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  position: relative;
}

.page-about .version-list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 14px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--blue), var(--cyan) 48%, var(--orange));
  opacity: .6;
}

.page-about .version-item {
  position: relative;
  padding: 0 0 24px 34px;
}

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

.page-about .version-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 3px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--blue);
}

.page-about .version-item:nth-child(2)::before { border-color: var(--cyan); }
.page-about .version-item:nth-child(3)::before { border-color: var(--lime); }
.page-about .version-item:nth-child(4)::before { border-color: var(--orange); background: rgba(255, 122, 26, .18); }

.page-about .version-item__badge {
  font-size: .75rem;
  letter-spacing: .14em;
  color: var(--orange);
}

.page-about .version-item__title {
  margin: 6px 0 6px;
  font-size: 1rem;
  font-weight: 800;
}

.page-about .version-item__desc {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.72;
  color: var(--ink-2);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .team-card {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-2);
}

.page-about .team-card__name {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 800;
}

.page-about .team-card__count {
  font-size: .75rem;
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-about .team-card p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.72;
  color: var(--ink-2);
}

.page-about .team-note {
  margin-top: 26px;
}

/* ---------- 规模 ---------- */
.page-about .scale-grid {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .scale-cell {
  background: var(--panel);
  padding: 20px 18px;
  display: grid;
  gap: 6px;
}

.page-about .scale-cell__num {
  font-size: clamp(1.75rem, 4.4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .scale-cell__cap {
  font-size: .8125rem;
  color: var(--ink-2);
}

.page-about .scale-spark {
  margin: 22px 0 0;
  padding: 12px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .scale-spark svg {
  display: block;
  width: 100%;
  height: 44px;
}

.page-about .scale-figure {
  margin: 26px 0 0;
}

/* ---------- 备案信息 ---------- */
.page-about .register-box {
  display: grid;
  gap: 14px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, rgba(46, 107, 255, .08), transparent 70%),
    var(--panel);
}

.page-about .register-row {
  display: grid;
  gap: 4px;
}

.page-about .register-row__label {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .12em;
  color: var(--ink-2);
}

.page-about .register-row__value {
  font-size: .9375rem;
  line-height: 1.6;
  color: var(--ink);
  word-break: break-word;
}

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

  .page-about .databar {
    grid-auto-flow: column;
    grid-auto-columns: 1fr;
  }

  .page-about .databar__item + .databar__item {
    border-top: 0;
    border-left: 1px solid var(--line);
  }

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

  .page-about .register-row--wide {
    grid-column: 1 / -1;
  }
}

@media (min-width: 760px) {
  .page-about .scale-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    gap: 52px;
    align-items: center;
    padding: 26px 0 68px;
  }

  .page-about .tools-layout {
    grid-template-columns: minmax(0, 1fr) minmax(220px, 300px);
    gap: 34px;
    align-items: start;
  }

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

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--status-h) + 24px);
  }

  .page-about .about-rail__list::before {
    content: "";
    position: absolute;
    left: 5px;
    top: 16px;
    bottom: 16px;
    width: 1px;
    background: var(--line);
  }

  .page-about .about-rail__link::before {
    position: relative;
    z-index: 1;
  }
}

@media (max-width: 999px) {
  .page-about .about-rail__list {
    display: flex;
    gap: 10px;
    overflow-x: auto;
    padding-bottom: 10px;
    scrollbar-width: thin;
  }

  .page-about .about-rail__item {
    flex: 0 0 auto;
  }

  .page-about .about-rail__link {
    padding: 7px 14px;
    border: 1px solid var(--line);
    border-radius: 999px;
    white-space: nowrap;
  }

  .page-about .about-rail__link::before {
    display: none;
  }
}

@media (max-width: 520px) {
  .page-about .flow-steps li {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .page-about .viz__row {
    grid-template-columns: 62px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}