.page-about {
  --about-axis-w: 92px;
  --about-gap: 20px;
  overflow-x: clip;
}

/* ---------- HERO ---------- */
.page-about .about-hero {
  position: relative;
  padding: 26px 0 40px;
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -18% -24% 34% -24%;
  background:
    radial-gradient(58% 62% at 74% 16%, rgba(91, 71, 214, 0.42), transparent 72%),
    radial-gradient(42% 48% at 8% -4%, rgba(0, 232, 206, 0.16), transparent 74%);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-hero__crumb {
  margin-bottom: 12px;
  font-size: 13px;
}

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

.page-about .about-hero__title {
  margin: 0 0 16px;
  font-size: clamp(32px, 8vw, 66px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  font-weight: 900;
  color: var(--yh-ink);
  text-shadow: 0 0 26px rgba(0, 232, 206, 0.22);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--yh-text-soft);
}

.page-about .about-hero__media {
  position: relative;
  border-radius: var(--yh-radius);
  overflow: hidden;
  background: linear-gradient(160deg, var(--yh-deep), var(--yh-void));
  min-height: 220px;
  aspect-ratio: 16 / 11;
}

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

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 22px;
  margin: 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--yh-line);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 92px;
}

.page-about .about-stat__num {
  font-size: 22px;
  font-weight: 700;
  color: var(--yh-cyan);
  letter-spacing: 0.08em;
}

.page-about .about-stat__label {
  font-size: 12.5px;
  color: var(--yh-mist);
}

/* ---------- 发展脉络 ---------- */
.page-about .about-line {
  background: linear-gradient(180deg, transparent, rgba(21, 18, 56, 0.62) 46%, rgba(10, 10, 28, 0.9));
}

.page-about .about-line__head {
  margin-bottom: 26px;
}

.page-about .about-line__body {
  display: grid;
  gap: 22px;
}

.page-about .about-axis {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 2px 0 8px;
  scrollbar-width: none;
  position: relative;
}

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

.page-about .about-axis__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border-radius: var(--yh-pill);
  border: 1px solid var(--yh-line);
  color: var(--yh-mist);
  font-family: var(--yh-font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.16s var(--yh-ease), border-color 0.16s var(--yh-ease);
}

.page-about .about-axis__item:hover,
.page-about .about-axis__item.is-active {
  color: var(--yh-cyan);
  border-color: var(--yh-line-strong);
}

.page-about .about-axis__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--yh-mist);
  flex: none;
}

.page-about .about-axis__item.is-active .about-axis__dot {
  background: var(--yh-cyan);
  box-shadow: 0 0 10px var(--yh-cyan);
}

.page-about .about-stages {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-stage {
  position: relative;
  padding: 24px 22px;
  border-radius: var(--yh-radius);
  border: 1px solid transparent;
  background: linear-gradient(160deg, rgba(36, 28, 85, 0.9), rgba(21, 18, 56, 0.5));
  transition: border-color 0.16s var(--yh-ease);
}

.page-about .about-stage:nth-child(2) {
  background: linear-gradient(160deg, rgba(36, 28, 85, 0.7), rgba(21, 18, 56, 0.46));
}

.page-about .about-stage:nth-child(3) {
  background: linear-gradient(160deg, rgba(30, 24, 72, 0.54), rgba(10, 10, 28, 0.62));
}

.page-about .about-stage:nth-child(4) {
  background: linear-gradient(160deg, rgba(26, 22, 66, 0.4), rgba(10, 10, 28, 0.78));
}

.page-about .about-stage::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(140px 140px at 100% 0%, rgba(0, 232, 206, 0.16), transparent 72%);
  opacity: 0;
  transition: opacity 0.16s var(--yh-ease);
  pointer-events: none;
}

.page-about .about-stage:hover {
  border-color: var(--yh-line-strong);
}

.page-about .about-stage:hover::after {
  opacity: 1;
}

.page-about .about-stage__tag {
  margin: 0 0 10px;
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: var(--yh-orange);
}

.page-about .about-stage__title {
  margin: 0 0 10px;
  color: var(--yh-ink);
}

.page-about .about-stage__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--yh-text-soft);
  max-width: 66ch;
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 24px;
}

.page-about .about-team__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--yh-text-soft);
  max-width: 60ch;
}

.page-about .about-team__media {
  border-radius: var(--yh-radius);
  overflow: hidden;
  background: linear-gradient(160deg, var(--yh-lift), var(--yh-deep));
  aspect-ratio: 3 / 2;
}

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

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

.page-about .about-team__group {
  padding: 16px 18px;
  border-radius: var(--yh-radius-sm);
  border: 1px solid var(--yh-line);
  background: rgba(21, 18, 56, 0.55);
  transition: border-color 0.16s var(--yh-ease);
}

.page-about .about-team__group:hover {
  border-color: var(--yh-line-strong);
}

.page-about .about-team__num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--yh-orange);
  margin-bottom: 6px;
}

.page-about .about-team__name {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--yh-ink);
}

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

/* ---------- 家庭专区 ---------- */
.page-about .about-family {
  background: linear-gradient(180deg, rgba(21, 18, 56, 0.72), rgba(10, 10, 28, 0.94));
}

.page-about .about-family__grid {
  display: grid;
  gap: 24px;
}

.page-about .about-family__text {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--yh-text-soft);
  max-width: 60ch;
}

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

.page-about .about-family__media {
  border-radius: var(--yh-radius);
  overflow: hidden;
  background: linear-gradient(160deg, var(--yh-lift), var(--yh-void));
  aspect-ratio: 14 / 9;
}

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

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

.page-about .about-family__point {
  padding: 16px 18px;
  border-left: 2px solid var(--yh-line-strong);
  background: linear-gradient(90deg, rgba(36, 28, 85, 0.5), transparent);
  border-radius: 0 var(--yh-radius-sm) var(--yh-radius-sm) 0;
}

.page-about .about-family__point p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--yh-text-soft);
}

/* ---------- 版本节奏 ---------- */
.page-about .about-version__head {
  margin-bottom: 26px;
}

.page-about .about-version__grid {
  display: grid;
  gap: 26px;
}

.page-about .about-version__text {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--yh-text-soft);
  max-width: 58ch;
}

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

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

.page-about .about-version__details .yh-details {
  border-radius: var(--yh-radius-sm);
  border: 1px solid var(--yh-line);
  background: rgba(21, 18, 56, 0.6);
  padding: 14px 18px;
  transition: border-color 0.16s var(--yh-ease);
}

.page-about .about-version__details .yh-details:hover {
  border-color: var(--yh-line-strong);
}

.page-about .about-version__details .yh-details__body p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--yh-text-soft);
}

/* ---------- 协作网络 ---------- */
.page-about .about-partner__head {
  margin-bottom: 22px;
}

.page-about .about-partner__lede {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--yh-text-soft);
  max-width: 66ch;
}

.page-about .about-partner__cols {
  display: grid;
  gap: 20px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-partner__col {
  padding-top: 16px;
  border-top: 1px solid var(--yh-line);
}

.page-about .about-partner__num {
  display: block;
  font-size: 20px;
  font-weight: 700;
  color: var(--yh-gold);
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.page-about .about-partner__col p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--yh-mist);
}

.page-about .about-partner__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ---------- 服务响应 ---------- */
.page-about .about-service {
  padding-bottom: 56px;
}

.page-about .about-service__grid {
  display: grid;
  gap: 26px;
  padding: 28px 24px;
  border-radius: var(--yh-radius);
  background:
    radial-gradient(120% 130% at 100% 0%, rgba(91, 71, 214, 0.34), transparent 68%),
    linear-gradient(150deg, rgba(36, 28, 85, 0.85), rgba(10, 10, 28, 0.9));
}

.page-about .about-service__text {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--yh-text-soft);
  max-width: 58ch;
}

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

.page-about .about-service__sla-item {
  padding: 14px 16px;
  border-radius: var(--yh-radius-sm);
  background: rgba(10, 10, 28, 0.5);
  border: 1px solid var(--yh-line);
}

.page-about .about-service__sla-num {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--yh-cyan);
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}

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

/* ---------- 焦点可达 ---------- */
.page-about a:focus-visible {
  outline: 2px solid var(--yh-cyan);
  outline-offset: 2px;
  border-radius: var(--yh-radius-sm);
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-team__groups {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-partner__cols {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }

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

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 34px 0 52px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 1fr);
    grid-template-areas:
      "copy media"
      "stats media";
    align-items: start;
    gap: 26px 52px;
  }

  .page-about .about-hero__copy {
    grid-area: copy;
    padding-top: 8px;
  }

  .page-about .about-hero__media {
    grid-area: media;
    aspect-ratio: auto;
    min-height: 380px;
    align-self: stretch;
  }

  .page-about .about-hero__stats {
    grid-area: stats;
    gap: 14px 34px;
  }

  .page-about .about-line__body {
    grid-template-columns: var(--about-axis-w) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-axis {
    position: sticky;
    top: calc(var(--yh-header-h) + 30px);
    flex-direction: column;
    align-items: flex-start;
    gap: 34px;
    overflow: visible;
    padding: 6px 0 6px 22px;
  }

  .page-about .about-axis::before {
    content: "";
    position: absolute;
    left: 3px;
    top: 6px;
    bottom: 6px;
    width: 1px;
    background: linear-gradient(180deg, rgba(0, 232, 206, 0.5), rgba(91, 71, 214, 0.24), transparent);
  }

  .page-about .about-axis__item {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding: 0;
    border: 0;
    border-radius: 0;
    background: none;
    font-size: 13px;
  }

  .page-about .about-axis__item:hover,
  .page-about .about-axis__item.is-active {
    border: 0;
  }

  .page-about .about-axis__year {
    writing-mode: vertical-rl;
    text-orientation: upright;
    letter-spacing: 0.2em;
  }

  .page-about .about-stage {
    padding: 28px 30px;
  }

  .page-about .about-stage:nth-child(1) {
    margin-right: 14%;
  }

  .page-about .about-stage:nth-child(2) {
    margin-right: 9%;
  }

  .page-about .about-stage:nth-child(3) {
    margin-right: 4%;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 1fr);
    grid-template-areas:
      "copy media"
      "groups media";
    align-items: start;
    gap: 26px 52px;
  }

  .page-about .about-team__copy {
    grid-area: copy;
  }

  .page-about .about-team__media {
    grid-area: media;
    aspect-ratio: 4 / 5;
  }

  .page-about .about-team__groups {
    grid-area: groups;
  }

  .page-about .about-family__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    grid-template-areas:
      "copy media"
      "points media";
    align-items: start;
    gap: 26px 52px;
  }

  .page-about .about-family__copy {
    grid-area: copy;
  }

  .page-about .about-family__media {
    grid-area: media;
    aspect-ratio: 14 / 15;
  }

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

  .page-about .about-version__grid {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-service__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: center;
    gap: 44px;
    padding: 40px 44px;
  }

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

@media (min-width: 1120px) {
  .page-about .about-service__sla {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ---------- 减少动态效果 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-stage,
  .page-about .about-stage::after,
  .page-about .about-team__group,
  .page-about .about-axis__item,
  .page-about .about-version__details .yh-details {
    transition: opacity 0.12s linear;
  }
}
</main>