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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--ink);
  color: var(--paper);
  padding: calc(var(--nav-h) + 44px) 0 60px;
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: var(--flag);
}

.page-about .about-hero__eyebrow {
  margin-top: 22px;
  color: var(--leaf);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  max-width: 17em;
  font-size: clamp(29px, 6.4vw, 52px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(247, 242, 232, 0.8);
}

.page-about .about-hero__specs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 18px;
  margin: 34px 0 0;
  padding-top: 26px;
  border-top: 1px solid rgba(143, 163, 212, 0.3);
}

.page-about .about-hero__spec dt {
  font-family: var(--mono);
  font-size: 25px;
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--gold);
}

.page-about .about-hero__spec dd {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: rgba(247, 242, 232, 0.68);
}

/* ---------- 分屏主体 ---------- */
.page-about .about-split {
  padding-top: 42px;
  padding-bottom: 76px;
}

.page-about .about-rail {
  margin-bottom: 38px;
}

.page-about .about-rail__figure {
  margin: 0 0 22px;
}

.page-about .about-rail__figure img {
  display: block;
  width: 100%;
  height: 168px;
  object-fit: cover;
  border-radius: 4px;
}

.page-about .about-rail__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--mist);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.62);
  white-space: nowrap;
  text-decoration: none;
}

.page-about .about-rail__no {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--red);
}

.page-about .about-rail__label {
  font-size: 13px;
  color: var(--text);
}

.page-about .about-body {
  min-width: 0;
}

/* ---------- 正文章节 ---------- */
.page-about .about-sec {
  scroll-margin-top: calc(var(--nav-h) + 24px);
  padding-bottom: 52px;
}

.page-about .about-sec:last-of-type {
  padding-bottom: 30px;
}

.page-about .about-sec__title {
  margin: 0 0 18px;
  font-size: clamp(21px, 3.5vw, 30px);
  line-height: 1.36;
  font-weight: 800;
  letter-spacing: -0.005em;
  color: var(--ink);
}

.page-about .about-sec__no {
  display: inline-block;
  min-width: 28px;
  margin-right: 12px;
  padding: 3px 6px;
  border-radius: 3px;
  background: var(--red);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 11px;
  line-height: 19px;
  text-align: center;
  letter-spacing: 0.08em;
  vertical-align: 3px;
}

.page-about .about-sec > p,
.page-about .about-tabs .idx-panel p {
  margin: 0 0 18px;
  max-width: 37em;
  font-size: 16.5px;
  line-height: 1.92;
  color: var(--text);
}

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

.page-about .about-body p a {
  color: var(--jade);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-body p a:hover {
  color: var(--red);
}

/* ---------- 图文 ---------- */
.page-about .about-figure {
  margin: 28px 0 6px;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 4px;
}

.page-about .about-figure .idx-figure__cap {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(26, 31, 43, 0.58);
}

/* ---------- 等宽数字带 ---------- */
.page-about .about-stats {
  position: relative;
  margin: 0 0 52px;
  padding: 34px 24px 32px;
  border-radius: 4px;
  background: var(--ink-deep);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 26px 18px;
  overflow: hidden;
}

.page-about .about-stats::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 4px;
  background: var(--flag);
}

.page-about .about-stats__num {
  margin: 0;
  font-family: var(--mono);
  font-size: clamp(26px, 5.2vw, 38px);
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--gold);
}

.page-about .about-stats__suffix,
.page-about .about-stats__op {
  margin-left: 2px;
  font-size: 15px;
  color: var(--leaf);
}

.page-about .about-stats__unit {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: 0.03em;
  color: var(--leaf);
}

/* ---------- 分段切换 ---------- */
.page-about .about-tabs {
  margin-top: 4px;
}

.page-about .about-tabs .idx-seg {
  margin-bottom: 22px;
}

.page-about .about-tabs .idx-panel {
  outline: none;
}

.page-about .about-tabs .idx-panel p:last-child {
  margin-bottom: 0;
}

/* ---------- 地区一致性色带 ---------- */
.page-about .about-region {
  position: relative;
  margin: 0 0 52px;
  border-radius: 4px;
  overflow: hidden;
  background: var(--ink-deep);
  color: var(--paper);
  scroll-margin-top: calc(var(--nav-h) + 24px);
}

.page-about .about-region__media {
  position: absolute;
  inset: 0;
}

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

.page-about .about-region__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 24, 48, 0.88) 0%, rgba(11, 24, 48, 0.68) 52%, rgba(11, 24, 48, 0.9) 100%);
}

.page-about .about-region__body {
  position: relative;
  padding: 36px 24px;
}

.page-about .about-region__title {
  margin: 0 0 16px;
  font-size: clamp(21px, 3.4vw, 29px);
  line-height: 1.36;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-region__body p {
  margin: 0 0 16px;
  max-width: 34em;
  font-size: 16.5px;
  line-height: 1.9;
  color: rgba(247, 242, 232, 0.84);
}

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

.page-about .about-region .about-sec__no {
  background: var(--gold);
  color: var(--ink);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: 6px;
}

.page-about .about-cta__rule {
  height: 4px;
  border-radius: 2px;
  background: var(--flag);
  margin-bottom: 28px;
}

.page-about .about-cta__text {
  margin: 0 0 20px;
  max-width: 30em;
  font-size: 17px;
  line-height: 1.7;
  font-weight: 600;
  color: var(--ink);
}

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

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding: calc(var(--nav-h) + 56px) 0 68px;
  }

  .page-about .about-hero__specs {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px 20px;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    padding: 40px 34px 36px;
    gap: 30px 20px;
  }
}

/* ---------- 桌面：左侧粘性时间轴 ＋ 右侧滚动正文 ---------- */
@media (min-width: 1024px) {
  .page-about .about-split {
    display: grid;
    grid-template-columns: 264px minmax(0, 1fr);
    gap: 64px;
    align-items: start;
    padding-top: 68px;
    padding-bottom: 104px;
  }

  .page-about .about-rail {
    margin-bottom: 0;
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: calc(var(--nav-h) + 20px);
  }

  .page-about .about-rail__figure img {
    height: 206px;
  }

  .page-about .about-rail__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__list::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 8px;
    bottom: 8px;
    width: 1px;
    background: var(--mist);
  }

  .page-about .about-rail__item {
    position: relative;
    padding-left: 24px;
    margin-bottom: 20px;
  }

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

  .page-about .about-rail__item::before {
    content: "";
    position: absolute;
    left: 0;
    top: 7px;
    width: 9px;
    height: 9px;
    border-radius: 2px;
    background: var(--gold);
  }

  .page-about .about-rail__link {
    display: block;
    padding: 0;
    border: 0;
    border-radius: 0;
    background: none;
    white-space: normal;
  }

  .page-about .about-rail__link:hover .about-rail__label {
    color: var(--red);
  }

  .page-about .about-rail__no {
    font-size: 14px;
  }

  .page-about .about-rail__label {
    display: block;
    margin-top: 3px;
    font-size: 14px;
    line-height: 1.45;
  }

  .page-about .about-region__body {
    padding: 56px 48px;
    max-width: 62%;
  }
}

/* ---------- 减少动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__inner {
    position: static;
  }

  .page-about .idx-reveal {
    opacity: 1 !important;
    transform: none !important;
  }
}