.page-about {
  background: var(--bg-deep);
  color: var(--paper);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-top: 18px;
}

.page-about .about-crumbs .crumbs__link {
  color: var(--cyan-soft);
}

.page-about .about-crumbs .crumbs__sep {
  color: var(--bg-line);
}

.page-about .about-crumbs .crumbs__item {
  color: var(--text-dim);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 34px 0 50px;
  border-bottom: 1px solid var(--bg-line);
  background: linear-gradient(112deg, rgba(4, 33, 26, .97) 0%, rgba(11, 56, 44, .94) 54%, rgba(18, 84, 69, .92) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(90deg, rgba(43, 240, 200, .055) 0 1px, transparent 1px 88px);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -42%;
  right: -12%;
  width: 54%;
  height: 190%;
  transform: skewX(-16deg);
  background: linear-gradient(180deg, rgba(43, 240, 200, .18), rgba(43, 240, 200, 0) 68%);
  pointer-events: none;
}

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

.page-about .about-hero__title {
  margin: 10px 0 16px;
  font-size: clamp(36px, 7.4vw, 82px);
  line-height: .98;
  letter-spacing: -.025em;
  font-weight: 900;
  max-width: 16ch;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 64ch;
  color: var(--cyan-soft);
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.85;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--bg-line);
  border: 1px solid var(--bg-line);
}

.page-about .about-hero__fact {
  background: rgba(4, 33, 26, .84);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .about-hero__num--hot {
  color: var(--orange);
}

.page-about .about-hero__cap {
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-dim);
}

@media (min-width: 760px) {
  .page-about .about-hero {
    padding: 46px 0 62px;
  }

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

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: 28px;
  padding: 40px 0 52px;
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 232px minmax(0, 1fr);
    align-items: start;
    gap: 60px;
    padding: 72px 0 88px;
  }
}

/* ---------- 竖向时间轴索引 ---------- */
.page-about .about-rail__card {
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--ink);
  box-shadow: var(--stack-paper);
  padding: 14px 14px 10px;
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-rail__list > li {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 4px 9px;
  color: var(--text-dim-ink);
  text-decoration: none;
  font-size: 13px;
  line-height: 1.35;
  white-space: nowrap;
  border-bottom: 2px solid rgba(10, 13, 12, .16);
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--orange);
  outline: none;
}

.page-about .about-rail__idx {
  font-size: 11px;
  color: var(--orange);
}

@media (min-width: 1000px) {
  .page-about .about-rail {
    position: sticky;
    top: 88px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }

  .page-about .about-rail__list > li {
    flex: 1 1 auto;
    width: 100%;
  }

  .page-about .about-rail__link {
    width: 100%;
    padding: 9px 2px;
    white-space: normal;
    border-bottom: 1px solid rgba(10, 13, 12, .16);
  }

  .page-about .about-rail__list > li:last-child .about-rail__link {
    border-bottom: 0;
  }
}

/* ---------- 文章块 ---------- */
.page-about .about-articles {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.page-about .about-article {
  position: relative;
  padding: 0 0 46px 22px;
  border-left: 1px solid var(--bg-line);
}

.page-about .about-article--last {
  border-left-color: transparent;
  padding-bottom: 34px;
}

.page-about .about-article::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 4px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--bg-deep);
  border: 2px solid var(--cyan);
  transition: background .2s var(--ease), border-color .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .about-article:target::before {
  background: var(--orange);
  border-color: var(--orange);
  box-shadow: 0 0 0 5px rgba(255, 122, 47, .18);
}

.page-about .about-article__num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .about-article__title {
  margin: 0 0 18px;
  font-size: clamp(25px, 3.6vw, 42px);
  line-height: 1.08;
  letter-spacing: -.018em;
  font-weight: 800;
  color: var(--paper);
  max-width: 20ch;
}

.page-about .about-article__body p {
  margin: 0 0 16px;
  max-width: 66ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text-dim);
}

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

.page-about .about-article__body a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-article .media-frame {
  margin: 26px 0 0;
}

/* ---------- 团队构成条形图 ---------- */
.page-about .team-bars {
  margin-top: 26px;
  display: grid;
  gap: 12px;
}

.page-about .team-bar {
  background: var(--bg-mid);
  border: 1px solid var(--bg-line);
  padding: 14px 16px 16px;
  transition: transform .2s var(--ease);
}

.page-about .team-bar:hover,
.page-about .team-bar:focus-within {
  transform: translateX(4px);
}

.page-about .team-bar__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.page-about .team-bar__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .team-bar__value {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--cyan-soft);
}

.page-about .team-bar__track {
  height: 8px;
  background: rgba(169, 255, 241, .1);
  overflow: hidden;
}

.page-about .team-bar__fill {
  display: block;
  height: 100%;
}

.page-about .team-bar--cyan .team-bar__fill {
  width: 35%;
  background: var(--cyan);
}

.page-about .team-bar--hot .team-bar__fill {
  width: 45%;
  background: var(--orange);
}

.page-about .team-bar--paper .team-bar__fill {
  width: 20%;
  background: var(--paper);
}

.page-about .team-bar__note {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--text-dim);
}

/* ---------- 版本层叠卡片 ---------- */
.page-about .versions {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .version {
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--ink);
  box-shadow: var(--stack-paper);
  padding: 16px 18px 18px;
  transition: transform .2s var(--ease);
}

.page-about .version:hover {
  transform: translateY(-3px);
}

.page-about .version__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--orange);
  background: var(--ink);
  padding: 3px 8px;
  margin-bottom: 10px;
}

.page-about .version__title {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.32;
  font-weight: 800;
  color: var(--ink);
}

.page-about .version__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim-ink);
}

@media (min-width: 760px) {
  .page-about .versions {
    gap: 16px;
  }

  .page-about .version:nth-child(2) {
    margin-left: 36px;
  }

  .page-about .version:nth-child(3) {
    margin-left: 72px;
  }
}

/* ---------- 认证印章 ---------- */
.page-about .seals {
  margin-top: 24px;
  display: grid;
  gap: 12px;
}

.page-about .seal {
  position: relative;
  border: 1px dashed var(--amber);
  background: rgba(255, 196, 143, .06);
  padding: 18px 16px 16px;
}

.page-about .seal::after {
  content: "";
  position: absolute;
  inset: 5px;
  border: 1px solid rgba(255, 196, 143, .2);
  pointer-events: none;
}

.page-about .seal__mark {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--amber);
}

.page-about .seal__title {
  margin: 8px 0 8px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .seal__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--text-dim);
}

@media (min-width: 680px) {
  .page-about .seals {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}

/* ---------- 尾部入口 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  margin-top: 4px;
  padding: 26px 22px 28px;
  border: 1px solid var(--bg-line);
  background: linear-gradient(135deg, rgba(18, 84, 69, .92), rgba(4, 33, 26, .97));
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 0 0 20px;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 窄屏细调 ---------- */
@media (max-width: 480px) {
  .page-about .about-hero__title {
    max-width: none;
  }

  .page-about .about-article {
    padding-left: 16px;
  }

  .page-about .about-article__title {
    max-width: none;
  }

  .page-about .team-bar__head {
    flex-wrap: wrap;
  }
}