.page-about {
  --about-rail-w: 236px;
  position: relative;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(34px, 6vw, 76px) clamp(30px, 4vw, 52px);
  background: linear-gradient(180deg, var(--c-void) 0%, var(--c-night) 100%);
  border-bottom: var(--stroke);
  border-color: var(--c-steel);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(1.95rem, 6.2vw, 4.1rem);
  line-height: 1.06;
  letter-spacing: -0.015em;
  color: var(--c-ice);
  margin: 14px 0 0;
  max-width: 17ch;
}

.page-about .about-hero__lead {
  max-width: 62ch;
  margin: 20px 0 0;
  font-size: clamp(1rem, 1.5vw, 1.1rem);
  line-height: 1.8;
  color: var(--c-haze);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 44px) 0 0;
  background: var(--c-steel);
  border: var(--stroke);
  border-color: var(--c-steel);
}

.page-about .about-hero__stat {
  background: var(--c-void);
  padding: 14px 16px;
  min-width: 0;
}

.page-about .about-hero__stat-label {
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--c-haze);
  margin: 0;
}

.page-about .about-hero__stat-value {
  margin: 8px 0 0;
  font-size: clamp(1.3rem, 3vw, 1.85rem);
  line-height: 1;
  color: var(--c-medal);
  word-break: break-word;
}

/* ---------- 主布局 ---------- */
.page-about .about-layout {
  padding-block: clamp(38px, 6vw, 84px) clamp(48px, 7vw, 96px);
}

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(46px, 6vw, 86px);
  min-width: 0;
}

/* ---------- 左侧检票口式索引 ---------- */
.page-about .about-rail {
  margin-block-end: clamp(26px, 4vw, 40px);
}

.page-about .about-rail__heading {
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  color: var(--c-haze);
  margin: 0 0 12px;
}

.page-about .about-rail__list {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  list-style: none;
  margin: 0;
  padding: 0 0 8px;
  scrollbar-width: thin;
}

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

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 14px;
  border: var(--stroke);
  border-color: var(--c-console);
  color: var(--c-ice);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--c-signal);
  color: var(--c-signal);
  background: rgba(0, 245, 200, 0.06);
}

.page-about .about-rail__num {
  font-size: 0.72rem;
  color: var(--c-signal);
}

.page-about .about-rail__name {
  font-size: 0.92rem;
}

.page-about .about-rail__note {
  display: none;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  min-width: 0;
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-section__head {
  margin-block-end: clamp(20px, 3vw, 32px);
}

.page-about .about-section__index {
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  color: var(--c-signal);
  margin: 0 0 10px;
}

.page-about .about-section__title {
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 3.6vw, 2.35rem);
  line-height: 1.22;
  color: var(--c-ice);
  margin: 0;
  max-width: 22ch;
}

.page-about .about-section__lead {
  margin: 14px 0 0;
  max-width: 56ch;
  line-height: 1.78;
  color: var(--c-haze);
}

.page-about .about-section__body p {
  max-width: 66ch;
  line-height: 1.82;
  color: var(--c-haze);
  margin: 0 0 1em;
}

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

/* ---------- 图片框 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(22px, 3vw, 34px);
}

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

.page-about .about-figure--square {
  max-width: 420px;
}

/* ---------- 三大索引组 ---------- */
.page-about .about-groups {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--c-steel);
  border: var(--stroke);
  border-color: var(--c-steel);
  margin: 0 0 clamp(24px, 4vw, 38px);
}

.page-about .about-group {
  background: var(--c-void);
  padding: clamp(18px, 2.6vw, 26px);
  min-width: 0;
  transition: background-color 0.22s var(--ease);
}

.page-about .about-group:hover {
  background: var(--c-night);
}

.page-about .about-group__tag {
  font-family: var(--font-cond);
  font-size: 0.84rem;
  letter-spacing: 0.16em;
  color: var(--c-signal);
  margin: 0 0 10px;
}

.page-about .about-group__title {
  font-family: var(--font-display);
  font-size: 1.06rem;
  line-height: 1.4;
  color: var(--c-ice);
  margin: 0 0 8px;
}

.page-about .about-group__text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--c-haze);
}

/* ---------- 数据块 ---------- */
.page-about .about-blocks {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-block-start: clamp(24px, 4vw, 38px);
}

.page-about .about-block {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: clamp(132px, 18vw, 160px);
  padding: clamp(18px, 2.4vw, 24px);
  border: var(--stroke);
  border-color: var(--c-steel);
  background: var(--c-console);
  overflow: hidden;
  transition: border-color 0.22s var(--ease), box-shadow 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .about-block:hover,
.page-about .about-block:focus-within {
  border-color: var(--c-signal);
  box-shadow: var(--shadow-hard);
  transform: translateY(-2px);
}

.page-about .about-block__value {
  margin: 0;
  font-size: clamp(1.9rem, 5vw, 2.8rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-medal);
}

.page-about .about-block__label {
  margin: 10px 0 0;
  font-size: 0.95rem;
  color: var(--c-ice);
}

.page-about .about-block__note {
  margin: 10px 0 0;
  font-size: 0.84rem;
  line-height: 1.65;
  color: var(--c-haze);
  transition: opacity 0.24s var(--ease), transform 0.24s var(--ease), visibility 0.24s;
}

/* ---------- 团队分工 ---------- */
.page-about .about-crew {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-crew__item {
  border-left: 3px solid var(--c-steel);
  padding: 4px 0 4px 16px;
  transition: border-color 0.22s var(--ease);
}

.page-about .about-crew__item:hover {
  border-left-color: var(--c-signal);
}

.page-about .about-crew__role {
  font-size: 0.88rem;
  letter-spacing: 0.14em;
  color: var(--c-signal-2);
  margin: 0 0 8px;
}

.page-about .about-crew__text {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--c-haze);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 34px);
  margin-block-end: clamp(24px, 4vw, 36px);
}

.page-about .about-partner {
  border-top: var(--stroke);
  border-color: var(--c-steel);
  padding-top: 18px;
  min-width: 0;
  transition: border-color 0.22s var(--ease);
}

.page-about .about-partner:hover {
  border-top-color: var(--c-signal);
}

.page-about .about-partner__num {
  margin: 0;
  font-size: clamp(1.8rem, 4.4vw, 2.6rem);
  line-height: 1;
  color: var(--c-signal);
}

.page-about .about-partner__title {
  font-family: var(--font-display);
  font-size: 1.08rem;
  color: var(--c-ice);
  margin: 12px 0 8px;
}

.page-about .about-partner__text {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.78;
  color: var(--c-haze);
}

/* ---------- 版本与荣誉 ---------- */
.page-about .about-honor {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
}

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

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 2px;
  border-left: var(--stroke);
  border-color: var(--c-steel);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(20px, 3vw, 28px) 24px;
  transition: color 0.22s var(--ease);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 6px;
  width: 10px;
  height: 10px;
  background: var(--c-void);
  border: 2px solid var(--c-steel);
  transform: rotate(45deg);
  transition: border-color 0.22s var(--ease), background-color 0.22s var(--ease);
}

.page-about .about-timeline__item:hover::before {
  border-color: var(--c-signal);
  background: var(--c-signal);
}

.page-about .about-timeline__year {
  margin: 0;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--c-medal);
}

.page-about .about-timeline__title {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--c-ice);
}

.page-about .about-timeline__text {
  margin: 6px 0 0;
  font-size: 0.93rem;
  line-height: 1.72;
  color: var(--c-haze);
}

.page-about .about-award {
  margin-block-start: clamp(24px, 3vw, 34px);
  border: var(--stroke);
  border-color: var(--c-steel);
  border-left: 4px solid var(--c-flag);
  background: var(--c-console);
  padding: clamp(16px, 2.4vw, 22px);
}

.page-about .about-award__tag {
  margin: 0 0 8px;
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  color: var(--c-medal);
}

.page-about .about-award__text {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.78;
  color: var(--c-ice);
}

/* ---------- 服务节奏 ---------- */
.page-about .about-cadence {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 38px);
}

.page-about .about-cadence__main p {
  margin: 0 0 1em;
  max-width: 62ch;
  line-height: 1.82;
  color: var(--c-haze);
}

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

.page-about .about-cadence__facts {
  margin: 0;
  border: var(--stroke);
  border-color: var(--c-steel);
  background: var(--c-void);
}

.page-about .about-cadence__fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 16px;
  border-bottom: 1px solid var(--c-steel);
}

.page-about .about-cadence__fact:last-child {
  border-bottom: 0;
}

.page-about .about-cadence__fact dt {
  font-size: 0.9rem;
  color: var(--c-haze);
}

.page-about .about-cadence__fact dd {
  margin: 0;
  font-size: 0.92rem;
  color: var(--c-ice);
  text-align: right;
}

.page-about .about-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: clamp(26px, 4vw, 40px) 0 0;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .about-crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 26px;
  }

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

/* ---------- 桌面看台式分栏 ---------- */
@media (min-width: 960px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    margin-block-end: 0;
  }

  .page-about .about-rail__list {
    display: block;
    overflow: visible;
    padding: 0;
    margin: 0;
    list-style: none;
  }

  .page-about .about-rail__item {
    display: block;
  }

  .page-about .about-rail__link {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 2px 10px;
    border: 0;
    border-left: 3px solid var(--c-steel);
    padding: 10px 0 10px 16px;
    white-space: normal;
    background: transparent;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-left-color: var(--c-signal);
    background: rgba(0, 245, 200, 0.05);
    color: var(--c-signal);
  }

  .page-about .about-rail__name {
    font-size: 0.95rem;
  }

  .page-about .about-rail__note {
    display: block;
    grid-column: 2;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--c-haze);
  }

  .page-about .about-honor {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }

  .page-about .about-cadence {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }
}

/* ---------- 悬停显示说明（仅精确指针设备） ---------- */
@media (hover: hover) and (pointer: fine) {
  .page-about .about-block__note {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    margin: 0;
    padding: 12px clamp(18px, 2.4vw, 24px);
    background: var(--c-night);
    border-top: 1px solid var(--c-steel);
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
  }

  .page-about .about-block:hover .about-block__note,
  .page-about .about-block:focus-within .about-block__note {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-group,
  .page-about .about-block,
  .page-about .about-block__note,
  .page-about .about-crew__item,
  .page-about .about-partner,
  .page-about .about-timeline__item::before {
    transition: none;
  }

  .page-about .about-block:hover,
  .page-about .about-block:focus-within {
    transform: none;
  }
}