/* ==========================================================
   平台介绍页 /introduction/  ——  .page-about 作用域
   ========================================================== */

.page-about {
  --about-axis-w: 176px;
  --about-rad: 2px;
  --about-shadow: 0 2px 0 0 var(--yp-night), 0 14px 28px -20px rgba(8, 14, 28, .55);
  background: var(--yp-paper);
  color: var(--yp-graphite);
}

.page-about a {
  color: inherit;
  text-decoration: none;
}

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--yp-jade);
  outline-offset: 3px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  background:
    radial-gradient(120% 140% at 88% 0%, rgba(110, 106, 168, .38) 0%, rgba(14, 23, 48, 0) 58%),
    var(--yp-ink);
  color: var(--yp-paper);
  padding: 28px 0 56px;
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--yp-jade) 0%, var(--yp-jade) 18%, var(--yp-gold) 18%, var(--yp-gold) 30%, var(--yp-mist) 30%, var(--yp-mist) 100%);
  opacity: .9;
}

.page-about .about-crumb {
  margin-bottom: 28px;
  color: var(--yp-slate);
}

.page-about .about-crumb .yp-breadcrumb__current {
  color: var(--yp-paper);
}

.page-about .about-crumb .yp-breadcrumb__link:hover {
  color: var(--yp-jade);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-size: clamp(30px, 6.4vw, 56px);
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: .01em;
  color: var(--yp-paper);
}

.page-about .about-hero__text {
  margin: 0;
  max-width: 46ch;
  font-size: var(--yp-fs-sm);
  line-height: 1.9;
  color: var(--yp-slate);
}

.page-about .about-quick {
  align-self: end;
  padding: 20px;
  border: 1px solid rgba(169, 176, 192, .28);
  border-left: 3px solid var(--yp-jade);
  border-radius: var(--about-rad);
  background: rgba(245, 243, 238, .05);
}

.page-about .about-quick__title {
  margin: 0 0 14px;
  font-family: var(--yp-font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--yp-gold);
}

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

.page-about .about-quick__link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-height: 44px;
  padding: 10px 12px;
  border-radius: var(--about-rad);
  transition: background-color var(--yp-t) var(--yp-ease), color var(--yp-t) var(--yp-ease);
}

.page-about .about-quick__link:hover {
  background: rgba(47, 191, 155, .14);
  color: #fff;
}

.page-about .about-quick__path {
  font-size: 11px;
  letter-spacing: .04em;
  color: var(--yp-slate);
}

/* ---------- 长卷骨架 ---------- */

.page-about .about-stage {
  padding-top: 40px;
  padding-bottom: 72px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .about-axis {
  position: sticky;
  top: 68px;
  z-index: 6;
  margin: -8px -4px 4px;
  padding: 8px 4px;
  background: linear-gradient(180deg, var(--yp-paper) 72%, rgba(245, 243, 238, 0));
}

.page-about .about-axis__title {
  display: none;
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--yp-mist);
}

.page-about .about-axis__list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-axis__link {
  display: flex;
  align-items: center;
  gap: 7px;
  min-height: 44px;
  padding: 8px 12px;
  white-space: nowrap;
  border: 1px solid rgba(28, 44, 91, .16);
  border-radius: 999px;
  background: rgba(255, 255, 255, .6);
  font-size: 13px;
  transition: border-color var(--yp-t) var(--yp-ease), background-color var(--yp-t) var(--yp-ease);
}

.page-about .about-axis__link:hover {
  border-color: var(--yp-jade);
  background: rgba(47, 191, 155, .12);
}

.page-about .about-axis__num {
  font-family: var(--yp-font-mono);
  font-size: 11px;
  letter-spacing: .04em;
  color: var(--yp-gold-deep);
}

.page-about .about-axis__name {
  font-weight: 600;
  color: var(--yp-indigo);
}

/* ---------- 章节通用 ---------- */

.page-about .about-section {
  scroll-margin-top: 132px;
  padding: 8px 0 4px;
}

.page-about .about-section__head {
  margin-bottom: 20px;
}

.page-about .about-section__title {
  margin: 8px 0 0;
  font-size: clamp(22px, 4.4vw, 33px);
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: .01em;
  color: var(--yp-indigo);
}

.page-about .about-prose p {
  margin: 0 0 16px;
  font-size: var(--yp-fs-sm);
  line-height: 1.9;
  color: var(--yp-graphite);
}

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

.page-about .about-note {
  margin: 22px 0 0;
  padding: 14px 16px;
  border-left: 3px solid var(--yp-mist);
  background: rgba(110, 106, 168, .09);
  font-size: var(--yp-fs-xs);
  line-height: 1.85;
  color: #4A4780;
}

/* ---------- 雾紫过渡带 ---------- */

.page-about .about-band {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 30px 0 8px;
  padding: 10px 16px;
  border-radius: var(--about-rad);
  border-left: 4px solid var(--yp-mist);
  background: linear-gradient(90deg, rgba(110, 106, 168, .2), rgba(110, 106, 168, .02));
}

.page-about .about-band__num {
  font-family: var(--yp-font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--yp-gold-deep);
}

.page-about .about-band__text {
  font-size: 12px;
  letter-spacing: .2em;
  color: #565286;
}

/* ---------- 01 双卡 ---------- */

.page-about .about-duo {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 24px;
}

.page-about .about-duo__card {
  display: flex;
  flex-direction: column;
  padding: 20px;
  border: 2px solid var(--yp-night);
  border-radius: var(--about-rad);
  background: var(--yp-card);
  box-shadow: var(--about-shadow);
}

.page-about .about-duo__card .yp-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.page-about .about-duo__card .yp-card__title {
  margin: 0;
  font-size: var(--yp-fs-md);
  font-weight: 800;
  color: var(--yp-indigo);
}

.page-about .about-duo__card .yp-card__meta {
  margin: 8px 0 14px;
  font-size: var(--yp-fs-xs);
  color: #58607A;
}

.page-about .about-duo__card .yp-card__body {
  flex: 1;
}

.page-about .about-duo__card .yp-card__foot {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid rgba(8, 14, 28, .14);
}

.page-about .about-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-list li {
  position: relative;
  padding-left: 20px;
  font-size: var(--yp-fs-xs);
  line-height: 1.8;
  color: var(--yp-graphite);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  background: var(--yp-jade);
  border-radius: 1px;
}

.page-about .about-link {
  font-size: var(--yp-fs-xs);
  font-weight: 600;
  color: var(--yp-indigo);
  border-bottom: 2px solid var(--yp-gold);
  padding-bottom: 2px;
  transition: color var(--yp-t) var(--yp-ease), border-color var(--yp-t) var(--yp-ease);
}

.page-about .about-link:hover {
  color: var(--yp-jade);
  border-color: var(--yp-jade);
}

/* ---------- 02 焦点项 ---------- */

.page-about .about-slot {
  margin-top: 24px;
}

.page-about .about-slot__rail {
  display: block;
  margin-bottom: 12px;
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--yp-mist);
}

.page-about .about-focus {
  position: relative;
  padding: 26px 20px 22px;
  border: 2px solid var(--yp-night);
  border-radius: var(--about-rad);
  background: var(--yp-indigo);
  color: var(--yp-paper);
  box-shadow: var(--about-shadow);
}

.page-about .about-focus__badge {
  display: inline-block;
  margin-bottom: 14px;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--yp-gold);
  color: var(--yp-night);
  font-family: var(--yp-font-mono);
  font-size: 11px;
  letter-spacing: .1em;
}

.page-about .about-focus__title {
  margin: 0 0 12px;
  font-size: var(--yp-fs-lg);
  line-height: 1.4;
  font-weight: 800;
  color: #fff;
}

.page-about .about-focus__text {
  margin: 0 0 20px;
  max-width: 52ch;
  font-size: var(--yp-fs-sm);
  line-height: 1.9;
  color: var(--yp-slate);
}

.page-about .about-path {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-path li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  min-height: 32px;
  padding: 9px 14px;
  border-left: 2px solid rgba(47, 191, 155, .7);
  background: rgba(8, 14, 28, .35);
  border-radius: var(--about-rad);
  font-size: var(--yp-fs-xs);
  line-height: 1.7;
  color: var(--yp-paper);
}

.page-about .about-path__num {
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--yp-jade);
  flex: none;
}

/* ---------- 03 标签 ---------- */

.page-about .about-tags__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 20px;
}

.page-about .about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
}

.page-about .about-tags .yp-tag {
  padding: 9px 14px;
  font-size: var(--yp-fs-xs);
}

.page-about .about-tags__foot {
  margin: 16px 0 0;
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--yp-mist);
}

.page-about .about-tags__figure {
  margin: 0;
  border: 2px solid var(--yp-night);
  border-radius: var(--about-rad);
  overflow: hidden;
  background: var(--yp-card);
  box-shadow: var(--about-shadow);
}

.page-about .about-tags__figure img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  transform: rotate(-2.5deg) scale(1.06);
  transform-origin: center;
}

.page-about .about-tags__figure .yp-figure__caption {
  padding: 12px 14px;
  font-family: var(--yp-font-mono);
  font-size: 11px;
  letter-spacing: .03em;
  color: #58607A;
  background: var(--yp-paper);
  border-top: 1px solid rgba(8, 14, 28, .12);
}

/* ---------- 04 流程 ---------- */

.page-about .about-flow__figure {
  margin: 0 0 24px;
  border: 2px solid var(--yp-night);
  border-radius: var(--about-rad);
  overflow: hidden;
  background: var(--yp-indigo);
  box-shadow: var(--about-shadow);
}

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

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

.page-about .about-step {
  padding: 18px;
  border: 1px solid rgba(8, 14, 28, .16);
  border-top: 3px solid var(--yp-indigo);
  border-radius: var(--about-rad);
  background: #fff;
  transition: border-top-color var(--yp-t) var(--yp-ease), box-shadow var(--yp-t) var(--yp-ease);
}

.page-about .about-step:hover,
.page-about .about-step:focus-within {
  border-top-color: var(--yp-jade);
  box-shadow: 0 12px 24px -20px rgba(8, 14, 28, .6);
}

.page-about .about-step__num {
  display: block;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--yp-gold-deep);
}

.page-about .about-step__name {
  margin: 8px 0 8px;
  font-size: var(--yp-fs-md);
  font-weight: 800;
  color: var(--yp-indigo);
}

.page-about .about-step__desc {
  margin: 0;
  font-size: var(--yp-fs-xs);
  line-height: 1.85;
  color: var(--yp-graphite);
}

.page-about .about-step__out {
  margin: 14px 0 0;
  padding: 6px 10px;
  display: inline-block;
  border-radius: 999px;
  background: rgba(110, 106, 168, .14);
  font-family: var(--yp-font-mono);
  font-size: 11px;
  letter-spacing: .04em;
  color: #565286;
  opacity: .55;
  transition: opacity var(--yp-t) var(--yp-ease), background-color var(--yp-t) var(--yp-ease);
}

.page-about .about-step:hover .about-step__out,
.page-about .about-step:focus-within .about-step__out {
  opacity: 1;
  background: rgba(47, 191, 155, .18);
  color: #1D6B57;
}

/* ---------- 05 改版历程 ---------- */

.page-about .about-revision__figure {
  margin: 0 0 22px;
  border: 2px solid var(--yp-night);
  border-radius: var(--about-rad);
  overflow: hidden;
  background: var(--yp-ink);
  box-shadow: var(--about-shadow);
}

.page-about .about-revision__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  opacity: .92;
}

.page-about .about-timeline {
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
  display: flex;
  gap: 0;
  overflow-x: auto;
  border-bottom: 2px solid rgba(28, 44, 91, .18);
}

.page-about .about-timeline__node {
  position: relative;
  flex: 1 0 72px;
  padding: 0 0 16px;
  text-align: center;
}

.page-about .about-timeline__dot {
  display: block;
  width: 12px;
  height: 12px;
  margin: 0 auto 10px;
  border-radius: 50%;
  background: var(--yp-mist);
}

.page-about .about-timeline__node.is-current .about-timeline__dot {
  background: var(--yp-jade);
  box-shadow: 0 0 0 5px rgba(47, 191, 155, .22);
}

.page-about .about-timeline__label {
  font-size: 11px;
  letter-spacing: .04em;
  color: #58607A;
}

.page-about .about-timeline__node.is-current .about-timeline__label {
  color: var(--yp-indigo);
  font-weight: 700;
}

.page-about .about-folds {
  display: grid;
  gap: 10px;
}

.page-about .about-folds .yp-fold {
  border: 1px solid rgba(8, 14, 28, .16);
  border-radius: var(--about-rad);
  background: #fff;
}

.page-about .about-folds .yp-fold__summary {
  min-height: 48px;
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: var(--yp-fs-sm);
  font-weight: 700;
  color: var(--yp-indigo);
  cursor: pointer;
}

.page-about .about-folds .yp-fold__body {
  padding: 0 16px 16px;
}

.page-about .about-folds .yp-fold__body p {
  margin: 0;
  font-size: var(--yp-fs-xs);
  line-height: 1.9;
  color: var(--yp-graphite);
}

/* ---------- 06 团队 ---------- */

.page-about .about-metrics {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-metric {
  padding: 16px 14px;
  border-radius: var(--about-rad);
  background: var(--yp-indigo);
  color: var(--yp-paper);
}

.page-about .about-metric__num {
  display: block;
  font-size: var(--yp-fs-xl);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: .04em;
  color: var(--yp-jade);
}

.page-about .about-metric__key {
  display: block;
  margin-top: 8px;
  font-size: var(--yp-fs-xs);
  color: var(--yp-slate);
}

.page-about .about-assure {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 22px;
}

.page-about .about-assure__item {
  padding: 18px;
  border: 1px solid rgba(8, 14, 28, .16);
  border-left: 3px solid var(--yp-gold);
  border-radius: var(--about-rad);
  background: rgba(231, 228, 220, .55);
}

.page-about .about-assure__title {
  margin: 0 0 8px;
  font-size: var(--yp-fs-sm);
  font-weight: 800;
  color: var(--yp-indigo);
}

.page-about .about-assure__item p {
  margin: 0;
  font-size: var(--yp-fs-xs);
  line-height: 1.85;
  color: var(--yp-graphite);
}

/* ---------- 07 规模与收束 ---------- */

.page-about .about-band--last {
  margin-top: 36px;
}

.page-about .about-section--last {
  padding-bottom: 8px;
}

.page-about .about-scale {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: 2px solid var(--yp-night);
}

.page-about .about-scale__item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 4px;
  border-bottom: 1px solid rgba(8, 14, 28, .16);
}

.page-about .about-scale__num {
  font-size: var(--yp-fs-lg);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--yp-indigo);
  order: -1;
}

.page-about .about-scale__key {
  font-size: var(--yp-fs-xs);
  color: #58607A;
}

.page-about .about-cta {
  margin-top: 34px;
  padding: 26px 20px;
  border: 2px solid var(--yp-night);
  border-radius: var(--about-rad);
  background: var(--yp-ink);
  box-shadow: var(--about-shadow);
}

.page-about .about-cta__text {
  margin: 0 0 20px;
  max-width: 52ch;
  font-size: var(--yp-fs-sm);
  line-height: 1.9;
  color: var(--yp-slate);
}

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

.page-about .about-cta__actions .yp-btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* ==========================================================
   断点：平板
   ========================================================== */

@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 34px 0 68px;
  }

  .page-about .about-duo {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-scale__item {
    padding: 18px 6px;
  }
}

/* ==========================================================
   断点：桌面 —— 左侧编号轴 + 右侧宽内容
   ========================================================== */

@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 40px 0 84px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) 306px;
    gap: 64px;
    align-items: end;
  }

  .page-about .about-hero__text {
    font-size: var(--yp-fs-md);
    line-height: 1.85;
  }

  .page-about .about-stage {
    grid-template-columns: var(--about-axis-w) minmax(0, 1fr);
    gap: 56px;
    padding-top: 64px;
    padding-bottom: 112px;
  }

  .page-about .about-axis {
    position: sticky;
    top: 96px;
    align-self: start;
    margin: 0;
    padding: 4px 0 0;
    background: none;
    overflow: visible;
  }

  .page-about .about-axis__title {
    display: block;
  }

  .page-about .about-axis__list {
    flex-direction: column;
    gap: 0;
    padding: 0;
    overflow: visible;
    border-left: 2px solid rgba(28, 44, 91, .16);
  }

  .page-about .about-axis__link {
    border: none;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: none;
    margin-left: -2px;
    padding: 11px 10px 11px 12px;
    justify-content: flex-start;
  }

  .page-about .about-axis__link:hover {
    border-left-color: var(--yp-jade);
    background: rgba(47, 191, 155, .08);
  }

  .page-about .about-axis__name {
    font-size: 13px;
  }

  .page-about .about-section {
    scroll-margin-top: 108px;
  }

  .page-about .about-band {
    margin: 44px 0 10px;
    padding: 12px 20px;
  }

  .page-about .about-tags__grid {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 44px;
    align-items: start;
  }

  .page-about .about-slot {
    display: grid;
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 28px;
    align-items: start;
  }

  .page-about .about-slot__rail {
    margin: 0;
    padding-top: 26px;
    writing-mode: horizontal-tb;
    line-height: 2.1;
    letter-spacing: .1em;
  }

  .page-about .about-scale {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 28px;
  }

  .page-about .about-scale__item {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 20px 0;
  }

  .page-about .about-cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
    padding: 30px 32px;
  }

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

  .page-about .about-cta__actions {
    flex: none;
  }
}

/* ==========================================================
   断点：宽屏
   ========================================================== */

@media (min-width: 1180px) {
  .page-about {
    --about-axis-w: 196px;
  }

  .page-about .about-stage {
    gap: 72px;
  }
}

/* ==========================================================
   动效降级
   ========================================================== */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-quick__link,
  .page-about .about-axis__link,
  .page-about .about-step,
  .page-about .about-step__out,
  .page-about .about-link,
  .page-about .about-tags__figure img {
    transition: none;
  }

  .page-about .about-tags__figure img {
    transform: none;
  }
}
</final>`