.page-about {
  --about-line: 2px solid var(--grid-blue);
  --about-ease: .2s ease;
}

/* ---------- 页首 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink-800);
  border-bottom: 3px solid var(--gold);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .5;
}

.page-about .about-hero__veil {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(11, 21, 36, .42) 0%, rgba(11, 21, 36, .84) 58%, var(--ink-900) 100%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
  padding: clamp(38px, 7vw, 86px) 0 clamp(34px, 5vw, 64px);
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: 24px;
}

.page-about .about-hero__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.2vw, 62px);
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--text-primary);
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 640px;
  font-size: clamp(15.5px, 1.9vw, 18px);
  line-height: 1.8;
  color: var(--text-secondary);
}

.page-about .about-facts {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-about .about-fact {
  border: 2px solid var(--grid-blue);
  border-radius: var(--radius);
  background: rgba(23, 41, 63, .88);
  padding: 14px 16px;
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(21px, 3.2vw, 28px);
  line-height: 1.2;
  color: var(--gold);
}

.page-about .about-fact__label {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--text-secondary);
}

/* ---------- 01 定位陈述 ---------- */
.page-about .about-statement {
  margin-top: 8px;
}

.page-about .about-statement__lede {
  margin: 0;
  padding-left: 18px;
  border-left: 4px solid var(--gold);
  max-width: 34em;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.7vw, 27px);
  font-weight: 700;
  line-height: 1.62;
  color: var(--text-primary);
}

.page-about .about-statement__split {
  display: grid;
  gap: 20px;
  margin-top: 30px;
}

.page-about .about-statement__split p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text-secondary);
}

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

.page-about .about-link {
  display: inline-block;
  font-size: 15px;
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(217, 164, 65, .55);
  padding-bottom: 2px;
  transition: color var(--about-ease), border-color var(--about-ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--gold-bright);
  border-bottom-color: var(--gold-bright);
}

/* ---------- 02 流程时间轴 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 38px;
  margin-top: 6px;
}

.page-about .about-flow__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 34px;
  position: relative;
}

.page-about .about-flow__list::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--grid-blue) 62%, rgba(62, 90, 122, .25) 100%);
}

.page-about .about-step {
  position: relative;
  padding-bottom: 18px;
  outline: none;
}

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

.page-about .about-step__dot {
  position: absolute;
  left: -34px;
  top: 2px;
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border: 2px solid var(--grid-blue);
  border-radius: 50%;
  background: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 9px;
  line-height: 1;
  color: var(--text-secondary);
  transition: border-color var(--about-ease), color var(--about-ease), background-color var(--about-ease);
}

.page-about .about-step__card {
  border: var(--about-line);
  border-radius: var(--radius);
  background: var(--ink-700);
  padding: 16px 18px;
  transition: border-color var(--about-ease), box-shadow var(--about-ease), transform var(--about-ease);
}

.page-about .about-step__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--text-primary);
}

.page-about .about-step__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 10px 0 0;
}

.page-about .about-step__time {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--text-secondary);
}

.page-about .about-step__detail {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-secondary);
  overflow: hidden;
}

.page-about .about-step__detail a {
  color: var(--gold);
}

.page-about .about-step:hover .about-step__dot,
.page-about .about-step:focus .about-step__dot,
.page-about .about-step:focus-within .about-step__dot {
  border-color: var(--gold);
  background: var(--ink-700);
  color: var(--gold);
}

.page-about .about-step:hover .about-step__card,
.page-about .about-step:focus .about-step__card,
.page-about .about-step:focus-within .about-step__card {
  border-color: var(--gold);
  box-shadow: var(--shadow-hard);
  transform: translate(-2px, -2px);
}

.page-about .about-flow__aside {
  order: -1;
}

.page-about .about-flow__figure {
  margin: 0;
}

.page-about .about-flow__figure .media-frame {
  border: var(--about-line);
  border-radius: var(--radius);
  background: var(--ink-800);
}

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

/* ---------- 03 规模表 ---------- */
.page-about .about-scale {
  margin-top: 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-scale .data-table {
  width: 100%;
  min-width: 560px;
}

.page-about .about-scale .data-table td.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  text-align: right;
  color: var(--gold);
  white-space: nowrap;
}

.page-about .about-scale__note {
  margin: 18px 0 0;
  max-width: 66ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-secondary);
}

.page-about .about-scale__note a {
  color: var(--gold);
}

/* ---------- 04 岗位卡片 ---------- */
.page-about .about-roles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 6px;
}

.page-about .about-role {
  position: relative;
  border: var(--about-line);
  border-radius: var(--radius);
  background: var(--ink-700);
  padding: 20px 18px 18px;
  outline: none;
  transition: border-color var(--about-ease), box-shadow var(--about-ease), background-color var(--about-ease);
}

.page-about .about-role:focus-visible,
.page-about .about-role:hover {
  border-color: var(--gold);
  box-shadow: var(--shadow-hard);
  background: var(--ink-800);
}

.page-about .about-role__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .about-role__title {
  margin: 9px 0 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--text-primary);
}

.page-about .about-role__count {
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 24px;
  line-height: 1.2;
  color: var(--gold);
}

.page-about .about-role__desc {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-secondary);
  border-top: 1px solid rgba(62, 90, 122, .55);
  padding-top: 12px;
}

.page-about .about-roles__note {
  margin: 24px 0 0;
  max-width: 68ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-secondary);
}

/* ---------- 05 年度轨道 ---------- */
.page-about .about-era-section {
  position: relative;
  overflow: hidden;
}

.page-about .about-era-section__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-era-section__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .16;
}

.page-about .about-era-section > .container {
  position: relative;
  z-index: 1;
}

.page-about .about-timeline {
  margin-top: 6px;
}

.page-about .about-timeline__track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 232px;
  gap: 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scroll-snap-type: x proximity;
  border-top: 2px solid var(--grid-blue);
  border-bottom: 2px solid var(--grid-blue);
  padding-bottom: 4px;
  outline: none;
}

.page-about .about-timeline__track:focus-visible {
  box-shadow: 0 0 0 2px var(--gold-bright);
  box-shadow: 0 0 0 2px var(--gold-bright);
}

.page-about .about-era {
  position: relative;
  scroll-snap-align: start;
  padding: 24px 18px 22px;
  border-right: 1px solid var(--grid-blue);
  background: rgba(23, 41, 63, .82);
  transition: background-color var(--about-ease);
}

.page-about .about-era:last-child {
  border-right: 0;
}

.page-about .about-era::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--gold) 0%, rgba(217, 164, 65, 0) 100%);
}

.page-about .about-era:hover {
  background: rgba(16, 30, 51, .92);
}

.page-about .about-era__year {
  display: inline-block;
  padding: 2px 9px;
  background: var(--gold);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .08em;
}

.page-about .about-era__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text-primary);
}

.page-about .about-era__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-secondary);
}

.page-about .about-timeline__hint {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--text-secondary);
}

.page-about .about-era-section__note {
  margin: 24px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-secondary);
}

.page-about .about-era-section__note a {
  color: var(--gold);
}

/* ---------- 06 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 6px;
}

.page-about .about-partner {
  border: var(--about-line);
  border-radius: var(--radius);
  background: var(--ink-800);
  padding: 22px 20px;
  transition: border-color var(--about-ease), box-shadow var(--about-ease);
}

.page-about .about-partner:hover {
  border-color: var(--gold);
  box-shadow: var(--shadow-hard);
}

.page-about .about-partner__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(34px, 5vw, 48px);
  line-height: 1;
  color: var(--cinnabar);
}

.page-about .about-partner__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--text-primary);
}

.page-about .about-partner__text {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-secondary);
}

.page-about .about-honor {
  margin-top: 26px;
  border: var(--about-line);
  border-left: 4px solid var(--cinnabar);
  border-radius: var(--radius);
  background: var(--ink-700);
  padding: 20px 20px 22px;
}

.page-about .about-honor__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cinnabar);
}

.page-about .about-honor__text {
  margin: 10px 0 0;
  max-width: 72ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-primary);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 30px 0 0;
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .about-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 760px) {
  .page-about .about-statement__split {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 40px;
  }

  .page-about .about-statement__lede {
    max-width: 30em;
  }
}

@media (min-width: 900px) {
  .page-about .about-step__detail {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    transition: max-height .24s ease, opacity .24s ease, margin-top .24s ease;
  }

  .page-about .about-step:hover .about-step__detail,
  .page-about .about-step:focus .about-step__detail,
  .page-about .about-step:focus-within .about-step__detail {
    max-height: 220px;
    margin-top: 10px;
    opacity: 1;
  }
}

@media (min-width: 1000px) {
  .page-about .about-flow {
    grid-template-columns: minmax(0, 1fr) 336px;
    gap: 54px;
    align-items: start;
  }

  .page-about .about-flow__aside {
    order: 0;
    position: sticky;
    top: 96px;
  }

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

  .page-about .about-timeline__track {
    grid-auto-columns: 200px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-timeline__track {
    grid-auto-columns: 1fr;
    grid-auto-flow: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-link,
  .page-about .about-step__dot,
  .page-about .about-step__card,
  .page-about .about-step__detail,
  .page-about .about-role,
  .page-about .about-era,
  .page-about .about-partner {
    transition: none;
  }

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