/* ===== 品牌与团队 / page-about ===== */

.page-about {
  --about-card-bg: linear-gradient(158deg, rgba(20, 26, 54, 0.94), rgba(11, 16, 38, 0.78));
  --about-shadow: 0 20px 46px -32px rgba(0, 0, 0, 0.92);
}

/* ---------- 面包屑 ---------- */
.page-about .yh-crumbs {
  padding: 20px 0 2px;
}

.page-about .yh-crumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--yh-muted);
}

.page-about .yh-crumbs__list a {
  color: var(--yh-muted);
  text-decoration: none;
  transition: color 0.18s var(--yh-ease);
}

.page-about .yh-crumbs__list a:hover {
  color: var(--yh-violet-soft);
}

.page-about .yh-crumbs__list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--yh-line);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: 18px;
}

.page-about .about-hero__frame {
  padding: 30px 22px 26px;
  background:
    radial-gradient(130% 96% at 100% 0%, rgba(108, 92, 231, 0.2), transparent 62%),
    linear-gradient(180deg, rgba(20, 26, 54, 0.96), rgba(11, 16, 38, 0.9));
  box-shadow: var(--about-shadow);
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  align-items: start;
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-size: clamp(30px, 8vw, 54px);
  line-height: 1.14;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lead {
  margin: 16px 0 0;
  max-width: 48ch;
}

.page-about .about-stats {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
}

.page-about .about-stat {
  border-top: 1px solid var(--yh-line);
  padding-top: 10px;
}

.page-about .about-stat__label {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--yh-muted);
}

.page-about .about-stat__num {
  margin: 6px 0 0;
  font-family: var(--yh-font-mono);
  font-weight: 500;
  font-size: 21px;
  line-height: 1.2;
  color: var(--yh-cyan);
}

/* ---------- 全宽横幅 ---------- */
.page-about .about-banner {
  padding: 26px 0 0;
}

.page-about .about-banner__media {
  aspect-ratio: 16 / 9;
}

/* ---------- 通用媒体 ---------- */
.page-about .yh-media {
  border-radius: var(--yh-radius);
  overflow: hidden;
}

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

.page-about .yh-media__caption {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: 0.03em;
  color: var(--yh-muted);
}

/* ---------- 品牌由来 ---------- */
.page-about .about-origin__main p {
  margin: 14px 0 0;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--yh-text);
}

.page-about .about-origin__main a {
  color: var(--yh-violet-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(166, 155, 255, 0.35);
  transition: color 0.18s var(--yh-ease), border-color 0.18s var(--yh-ease);
}

.page-about .about-origin__main a:hover {
  color: var(--yh-violet);
  border-color: var(--yh-violet);
}

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

.page-about .about-origin__note {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--yh-muted);
}

/* ---------- 三类角色 ---------- */
.page-about .about-roles__head {
  margin-bottom: 26px;
}

.page-about .about-roles__list {
  display: grid;
  gap: 18px;
}

.page-about .about-role {
  position: relative;
  padding: 24px 20px 22px;
  background: var(--about-card-bg);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border-radius: 14px;
  box-shadow: var(--about-shadow);
  transition: border-color 0.2s var(--yh-ease), transform 0.2s var(--yh-ease);
}

.page-about .about-role:hover {
  border-color: rgba(108, 92, 231, 0.55);
  transform: translateY(-2px);
}

.page-about .about-role__no {
  display: inline-block;
  color: var(--yh-violet-soft);
  font-size: 13px;
}

.page-about .about-role .yh-card__title {
  margin: 10px 0 0;
  font-size: 19px;
  line-height: 1.4;
}

.page-about .about-role .yh-card__meta {
  margin: 6px 0 0;
  font-family: var(--yh-font-mono);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--yh-cyan);
}

.page-about .about-role__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .about-role__list li {
  position: relative;
  padding-left: 16px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--yh-muted);
}

.page-about .about-role__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 7px;
  height: 1px;
  background: var(--yh-violet);
}

.page-about .about-role__list a {
  color: var(--yh-violet-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(166, 155, 255, 0.3);
}

.page-about .about-role__list a:hover {
  color: var(--yh-violet);
}

/* ---------- 角色索引 ---------- */
.page-about .about-index {
  margin-top: 24px;
}

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

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 0;
  border-top: 1px solid var(--yh-line);
  font-size: 14.5px;
  color: var(--yh-muted);
  text-decoration: none;
  transition: color 0.18s var(--yh-ease), padding-left 0.18s var(--yh-ease);
}

.page-about .about-index__link:hover {
  color: var(--yh-violet-soft);
  padding-left: 6px;
}

.page-about .about-index__link .yh-index {
  color: var(--yh-cyan);
}

.page-about .about-index__tip {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: 0.03em;
  color: var(--yh-muted);
}

/* ---------- 内容节奏 ---------- */
.page-about .about-cadence__text > p {
  margin: 14px 0 0;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--yh-text);
}

.page-about .about-cadence__list {
  margin: 24px 0 0;
  display: grid;
  gap: 0;
}

.page-about .about-cadence__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 14px 0;
  border-top: 1px solid var(--yh-line);
}

.page-about .about-cadence__item:last-child {
  border-bottom: 1px solid var(--yh-line);
}

.page-about .about-cadence__item dt {
  font-family: var(--yh-font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--yh-amber);
}

.page-about .about-cadence__item dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--yh-muted);
}

.page-about .about-cadence__tail {
  margin: 22px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--yh-text);
}

.page-about .about-cadence__tail a {
  color: var(--yh-violet-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(166, 155, 255, 0.35);
}

.page-about .about-cadence__tail a:hover {
  color: var(--yh-violet);
}

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

.page-about .about-cadence__media {
  aspect-ratio: 9 / 7;
}

/* ---------- 版本演进 ---------- */
.page-about .about-roadmap__head {
  margin-bottom: 24px;
}

.page-about .about-roadmap__media {
  aspect-ratio: 12 / 5;
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--yh-violet), var(--yh-line) 70%, transparent);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 26px 26px;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 4px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 1px solid var(--yh-violet);
  background: var(--yh-bg);
  transition: background 0.2s var(--yh-ease), border-color 0.2s var(--yh-ease);
}

.page-about .about-timeline__item:last-child::before {
  background: var(--yh-amber);
  border-color: var(--yh-amber);
  box-shadow: 0 0 0 5px rgba(240, 162, 75, 0.16);
}

.page-about .about-timeline__item:hover::before {
  background: var(--yh-violet);
}

.page-about .about-timeline__item:last-child:hover::before {
  background: var(--yh-amber-deep);
}

.page-about .about-timeline__ver {
  display: inline-block;
  font-family: var(--yh-font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--yh-cyan);
}

.page-about .about-timeline__title {
  margin: 8px 0 0;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--yh-text);
  transition: color 0.18s var(--yh-ease);
}

.page-about .about-timeline__item:hover .about-timeline__title {
  color: var(--yh-violet-soft);
}

.page-about .about-timeline__desc {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--yh-muted);
}

.page-about .about-roadmap__aside {
  margin-top: 28px;
  border-left: 1px solid var(--yh-line);
  padding-left: 18px;
}

.page-about .about-roadmap__aside-text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--yh-muted);
}

.page-about .about-roadmap__aside .yh-btn {
  margin-top: 16px;
}

/* ---------- 平台与人群 ---------- */
.page-about .about-platforms__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.page-about .about-platform {
  border-top: 1px solid var(--yh-line);
  padding: 16px 0 18px;
}

.page-about .about-platform__name {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--yh-text);
}

.page-about .about-platform__req {
  margin: 6px 0 0;
  font-family: var(--yh-font-mono);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--yh-cyan);
}

.page-about .about-platform__desc {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--yh-muted);
}

.page-about .about-platforms__aside {
  margin-top: 26px;
  padding: 20px 18px;
  background: var(--about-card-bg);
  border-radius: 14px;
  box-shadow: var(--about-shadow);
}

.page-about .about-platforms__aside-title {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--yh-violet-soft);
}

.page-about .about-platforms__people {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-platforms__people li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--yh-muted);
}

.page-about .about-platforms__people li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  border: 1px solid var(--yh-violet);
}

/* ---------- 结尾行动 ---------- */
.page-about .about-next {
  padding-bottom: 0;
}

.page-about .about-next__frame {
  padding: 30px 22px 28px;
  background:
    radial-gradient(120% 100% at 0% 100%, rgba(240, 162, 75, 0.12), transparent 58%),
    linear-gradient(180deg, rgba(20, 26, 54, 0.94), rgba(11, 16, 38, 0.9));
  text-align: left;
}

.page-about .about-next__title {
  margin: 0;
  font-size: clamp(24px, 6vw, 34px);
  line-height: 1.24;
}

.page-about .about-next__lead {
  margin: 14px 0 0;
  max-width: 46ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--yh-muted);
}

.page-about .about-next__actions {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero__frame {
    padding: 40px 34px 34px;
  }

  .page-about .about-platforms__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 28px;
  }

  .page-about .about-cadence__item {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }

  .page-about .about-next__frame {
    padding: 40px 38px 36px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    gap: 36px;
  }

  .page-about .about-hero__aside {
    padding-left: 22px;
    border-left: 1px solid var(--yh-line);
  }

  .page-about .about-banner__media {
    aspect-ratio: 21 / 9;
  }

  .page-about .about-origin__aside {
    margin-top: 0;
    padding-left: 22px;
  }

  .page-about .about-roles__list {
    gap: 20px;
  }

  .page-about .about-index {
    margin-top: 0;
    position: sticky;
    top: calc(var(--yh-header-h) + 20px);
    align-self: start;
  }

  .page-about .about-cadence__figure {
    margin-top: 0;
    align-self: start;
  }

  .page-about .about-roadmap__aside {
    margin-top: 0;
    padding-left: 22px;
    position: sticky;
    top: calc(var(--yh-header-h) + 20px);
    align-self: start;
  }

  .page-about .about-platforms__aside {
    margin-top: 0;
    position: sticky;
    top: calc(var(--yh-header-h) + 20px);
    align-self: start;
  }

  .page-about .about-next__frame {
    padding: 48px 44px 42px;
  }

  .page-about .about-next__actions {
    gap: 14px;
  }
}

/* ---------- 尊重减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-index__link,
  .page-about .about-timeline__item::before,
  .page-about .about-timeline__title {
    transition: none;
  }

  .page-about .about-role:hover {
    transform: none;
  }

  .page-about .about-index__link:hover {
    padding-left: 0;
  }
}