.page-about {
  background: var(--bs-paper);
  color: var(--bs-text);
  overflow-x: hidden;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: 26px 0 46px;
  border-radius: 0 0 var(--bs-r-lg) var(--bs-r-lg);
  background: linear-gradient(152deg, #0B2036 0%, #14406E 48%, #2E6FA8 100%);
  color: #EAF2FA;
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: radial-gradient(112% 84% at 88% 4%, rgba(228, 118, 42, .30), transparent 62%);
}

.page-about .about-hero__main {
  max-width: 760px;
}

.page-about .about-hero__crumb {
  margin-bottom: 22px;
}

.page-about .about-hero__crumb .bs-breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
}

.page-about .about-hero__crumb .bs-breadcrumb__item {
  color: rgba(234, 242, 250, .60);
}

.page-about .about-hero__crumb .bs-breadcrumb__item + .bs-breadcrumb__item::before {
  content: "/";
  margin: 0 8px;
  color: rgba(234, 242, 250, .35);
}

.page-about .about-hero__crumb .bs-breadcrumb__item a {
  color: rgba(234, 242, 250, .84);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .22s var(--bs-ease), color .22s var(--bs-ease);
}

.page-about .about-hero__crumb .bs-breadcrumb__item a:hover,
.page-about .about-hero__crumb .bs-breadcrumb__item a:focus-visible {
  color: #FFFFFF;
  border-bottom-color: rgba(234, 242, 250, .68);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  color: #F3AE72;
  font-family: var(--bs-font-mono);
  font-size: 12.5px;
  letter-spacing: .14em;
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-family: var(--bs-font-display);
  font-weight: 800;
  font-size: clamp(28px, 5.2vw, 46px);
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: #FFFFFF;
}

.page-about .about-hero__lede {
  margin: 0 0 30px;
  max-width: 640px;
  font-family: var(--bs-font-body);
  font-size: 16px;
  line-height: 1.85;
  color: rgba(234, 242, 250, .86);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__facts li {
  padding: 14px 18px;
  border: 1px solid rgba(234, 242, 250, .18);
  border-radius: var(--bs-r-card);
  background: rgba(251, 252, 254, .07);
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--bs-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  font-weight: 700;
  line-height: 1.15;
  color: #FFFFFF;
  letter-spacing: -0.01em;
}

.page-about .about-fact__unit {
  margin-left: 3px;
  font-size: 14px;
  font-weight: 500;
  color: rgba(234, 242, 250, .70);
}

.page-about .about-fact__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(234, 242, 250, .68);
}

/* ============ 章节索引 ============ */
.page-about .about-toc {
  background: var(--bs-paper);
  border-bottom: 1px solid var(--bs-line);
}

.page-about .about-toc__inner {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-top: 16px;
  padding-bottom: 16px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-toc__hint {
  flex: 0 0 auto;
  font-family: var(--bs-font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--bs-muted);
  text-transform: uppercase;
}

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

.page-about .about-toc__pill {
  display: inline-block;
  padding: 8px 16px;
  border: 1px solid var(--bs-line);
  border-radius: var(--bs-r-pill);
  background: var(--bs-paper);
  color: var(--bs-blue);
  font-size: 14px;
  line-height: 1.4;
  white-space: nowrap;
  text-decoration: none;
  transition: transform .22s var(--bs-ease), background-color .22s var(--bs-ease),
    border-color .22s var(--bs-ease), color .22s var(--bs-ease);
}

.page-about .about-toc__pill:hover,
.page-about .about-toc__pill:focus-visible {
  transform: translateY(-2px);
  background: var(--bs-mist);
  border-color: var(--bs-blue-lift);
}

/* ============ 章节骨架 ============ */
.page-about .about-chapter {
  padding: 42px 0;
  border-top: 1px solid var(--bs-line-soft);
  scroll-margin-top: 96px;
}

.page-about .about-chapter--mist {
  background: var(--bs-mist);
}

.page-about .about-chapter--ink {
  background: var(--bs-ink);
  border-top-color: rgba(234, 242, 250, .14);
  color: rgba(234, 242, 250, .84);
}

.page-about .about-chapter__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.page-about .about-chapter__num {
  display: inline-block;
  font-family: var(--bs-font-display);
  font-weight: 800;
  font-size: 40px;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--bs-orange);
}

.page-about .about-chapter__title {
  margin: 0 0 14px;
  font-family: var(--bs-font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 32px);
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--bs-ink);
}

.page-about .about-chapter--ink .about-chapter__title {
  color: #FFFFFF;
}

.page-about .about-chapter__intro {
  margin: 0 0 26px;
  font-family: var(--bs-font-body);
  font-size: 17px;
  line-height: 1.85;
  color: var(--bs-text);
}

.page-about .about-chapter--ink .about-chapter__intro {
  color: rgba(234, 242, 250, .82);
}

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

/* ============ 01 职责 ============ */
.page-about .about-duties {
  display: grid;
  gap: 14px;
  margin: 0 0 28px;
  padding: 0;
  list-style: none;
}

.page-about .about-duty {
  padding: 20px 22px;
  border: 1px solid var(--bs-line-soft);
  border-radius: var(--bs-r-card);
  background: var(--bs-paper);
  transition: border-color .22s var(--bs-ease), transform .22s var(--bs-ease),
    box-shadow .22s var(--bs-ease);
}

.page-about .about-duty:hover {
  transform: translateY(-2px);
  border-color: var(--bs-blue-lift);
  box-shadow: var(--bs-shadow-soft);
}

.page-about .about-duty__title {
  margin: 0 0 8px;
  font-family: var(--bs-font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.4;
  color: var(--bs-blue);
}

.page-about .about-duty__body {
  margin: 0;
  font-family: var(--bs-font-body);
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--bs-text);
}

/* ============ 02 维护节奏 ============ */
.page-about .about-cycle {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cycle__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 16px 20px;
  border: 1px solid var(--bs-line-soft);
  border-radius: var(--bs-r-card);
  background: var(--bs-paper);
}

.page-about .about-cycle__tag {
  display: inline-block;
  padding: 5px 14px;
  border-radius: var(--bs-r-pill);
  background: var(--bs-orange-soft);
  color: #A6500F;
  font-family: var(--bs-font-mono);
  font-size: 13px;
  line-height: 1.5;
  white-space: nowrap;
}

.page-about .about-cycle__tag--jade {
  background: var(--bs-jade-soft);
  color: #1B6B65;
}

.page-about .about-cycle__tag--blue {
  background: rgba(46, 111, 168, .14);
  color: var(--bs-blue);
}

.page-about .about-cycle__item p {
  margin: 0;
  font-family: var(--bs-font-body);
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--bs-text);
}

/* ============ 03 团队 ============ */
.page-about .about-crew {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 0 0 28px;
  padding: 0;
  list-style: none;
}

.page-about .about-crew__item {
  padding: 20px;
  border: 1px solid var(--bs-line-soft);
  border-radius: var(--bs-r-card);
  background: linear-gradient(168deg, rgba(232, 240, 247, .92) 0%, var(--bs-paper) 70%);
}

.page-about .about-crew__num {
  display: block;
  font-family: var(--bs-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--bs-blue);
}

.page-about .about-crew__name {
  display: block;
  margin-top: 10px;
  font-family: var(--bs-font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--bs-ink);
}

.page-about .about-crew__desc {
  display: block;
  margin-top: 8px;
  font-family: var(--bs-font-body);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--bs-text);
}

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

.page-about .about-media .bs-media__frame {
  border-radius: var(--bs-r-card);
  overflow: hidden;
  background: linear-gradient(150deg, var(--bs-mist), var(--bs-jade-soft));
}

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

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

.page-about .about-media .bs-media__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--bs-muted);
}

.page-about .about-chapter--ink .about-media .bs-media__caption {
  color: rgba(234, 242, 250, .58);
}

/* ============ 04 时间线 ============ */
.page-about .about-timeline {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline__item {
  padding: 18px 20px;
  border: 1px solid rgba(234, 242, 250, .16);
  border-radius: var(--bs-r-card);
  background: rgba(251, 252, 254, .06);
  transition: transform .22s var(--bs-ease), border-color .22s var(--bs-ease),
    background-color .22s var(--bs-ease);
}

.page-about .about-timeline__item:hover,
.page-about .about-timeline__item:focus-within {
  transform: translateY(-3px);
  border-color: rgba(228, 118, 42, .72);
  background: rgba(228, 118, 42, .13);
}

.page-about .about-timeline__node {
  display: inline-block;
  padding: 5px 14px;
  border-radius: var(--bs-r-pill);
  background: rgba(47, 163, 154, .22);
  color: #A6E4DE;
  font-family: var(--bs-font-mono);
  font-size: 12.5px;
  line-height: 1.5;
  white-space: nowrap;
}

.page-about .about-timeline__text {
  margin: 12px 0 0;
  font-family: var(--bs-font-body);
  font-size: 15px;
  line-height: 1.8;
  color: rgba(234, 242, 250, .78);
}

/* ============ 05 三道关口 ============ */
.page-about .about-checks {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--bs-line);
}

.page-about .about-checks__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 12px 16px;
  align-items: start;
  padding: 18px 0;
  border-bottom: 1px solid var(--bs-line);
}

.page-about .about-checks__idx {
  font-family: var(--bs-font-display);
  font-weight: 800;
  font-size: 20px;
  line-height: 1.5;
  color: var(--bs-orange);
}

.page-about .about-checks__name {
  margin: 0;
  font-family: var(--bs-font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.5;
  color: var(--bs-ink);
}

.page-about .about-checks__text {
  grid-column: 2 / -1;
  margin: 0;
  font-family: var(--bs-font-body);
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--bs-text);
}

/* ============ 右侧注释位 ============ */
.page-about .about-chapter__note {
  padding: 18px 20px;
  border: 1px solid var(--bs-line-soft);
  border-radius: var(--bs-r-card);
  background: var(--bs-mist);
}

.page-about .about-chapter--mist .about-chapter__note {
  background: var(--bs-paper);
}

.page-about .about-chapter--ink .about-chapter__note {
  border-color: rgba(234, 242, 250, .16);
  background: rgba(251, 252, 254, .07);
}

.page-about .about-note__label {
  margin: 0 0 8px;
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--bs-muted);
}

.page-about .about-chapter--ink .about-note__label {
  color: rgba(234, 242, 250, .58);
}

.page-about .about-note__value {
  margin: 0;
  font-family: var(--bs-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 24px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--bs-blue);
}

.page-about .about-chapter--ink .about-note__value {
  color: var(--bs-orange);
}

.page-about .about-note__desc {
  margin: 10px 0 0;
  font-family: var(--bs-font-body);
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--bs-text);
}

.page-about .about-chapter--ink .about-note__desc {
  color: rgba(234, 242, 250, .74);
}

/* ============ 收口 ============ */
.page-about .about-cta {
  padding: 46px 0 54px;
  border-top: 1px solid var(--bs-line);
  background: var(--bs-paper);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--bs-font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.4vw, 28px);
  line-height: 1.34;
  letter-spacing: -0.02em;
  color: var(--bs-ink);
}

.page-about .about-cta__text p {
  margin: 0;
  max-width: 620px;
  font-family: var(--bs-font-body);
  font-size: 16px;
  line-height: 1.85;
  color: var(--bs-text);
}

.page-about .about-cta__hint {
  margin-top: 14px !important;
  font-size: 14px !important;
  color: var(--bs-muted) !important;
}

.page-about .about-cta__hint a {
  color: var(--bs-blue);
  text-decoration: none;
  border-bottom: 1px solid var(--bs-line);
  transition: border-color .22s var(--bs-ease), color .22s var(--bs-ease);
}

.page-about .about-cta__hint a:hover,
.page-about .about-cta__hint a:focus-visible {
  color: var(--bs-blue-lift);
  border-bottom-color: var(--bs-blue-lift);
}

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

/* ============ 焦点环 ============ */
.page-about a:focus-visible,
.page-about .about-toc__pill:focus-visible {
  outline: 2px solid var(--bs-orange);
  outline-offset: 3px;
}

/* ============ 响应式 ============ */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding: 34px 0 58px;
  }

  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-checks__item {
    grid-template-columns: 44px minmax(0, 220px) minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

  .page-about .about-checks__text {
    grid-column: auto;
  }
}

@media (min-width: 860px) {
  .page-about .about-chapter {
    padding: 54px 0;
  }

  .page-about .about-chapter__inner {
    grid-template-columns: 68px minmax(0, 620px) 226px;
    column-gap: 44px;
    align-items: start;
    justify-content: start;
  }

  .page-about .about-chapter__aside {
    padding-top: 4px;
  }

  .page-about .about-crew {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

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

@media (min-width: 1080px) {
  .page-about .about-hero__main {
    max-width: 800px;
  }

  .page-about .about-hero__lede {
    font-size: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__pill,
  .page-about .about-duty,
  .page-about .about-timeline__item {
    transition: none;
  }

  .page-about .about-toc__pill:hover,
  .page-about .about-duty:hover,
  .page-about .about-timeline__item:hover {
    transform: none;
  }
}