.page-about {
  --about-line: rgba(143, 163, 200, 0.24);
  --about-line-strong: rgba(143, 163, 200, 0.16);
  --about-violet-line: rgba(155, 140, 255, 0.42);
  --about-rail-w: 212px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(36px, 7vw, 78px) 0 clamp(44px, 8vw, 92px);
  background:
    radial-gradient(58% 52% at 88% 0%, rgba(56, 225, 208, 0.15), transparent 68%),
    radial-gradient(46% 46% at 2% 10%, rgba(155, 140, 255, 0.15), transparent 72%),
    var(--c-void);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-neon), var(--c-violet), transparent);
  opacity: 0.45;
}

.page-about .about-hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-crumbs {
  grid-column: 1 / -1;
}

.page-about .about-title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.05rem, 6.2vw, 4rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--c-paper);
  text-wrap: balance;
}

.page-about .about-lead {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 56ch;
  font-size: clamp(1rem, 1.6vw, 1.06rem);
  line-height: 1.78;
  color: var(--c-mist);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 10px;
  list-style: none;
  border-radius: var(--radius-l);
  border: 1px solid var(--glass-line);
  background: var(--glass);
  box-shadow: var(--shadow-soft);
}

.page-about .about-fact {
  padding: 16px 14px;
  border-radius: var(--radius-m);
  background: rgba(7, 16, 38, 0.45);
}

.page-about .about-fact-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.5rem, 3.6vw, 2.05rem);
  line-height: 1.1;
  letter-spacing: 0.06em;
  color: var(--c-amber);
  font-variant-numeric: tabular-nums;
}

.page-about .about-fact-label {
  display: block;
  margin-top: 8px;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--c-mist);
}

/* ---------- 起点 ---------- */
.page-about .about-origin-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-prose p {
  margin: 0 0 1em;
  color: var(--c-mist);
  line-height: 1.78;
}

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

.page-about .about-origin-figure,
.page-about .about-team-figure {
  margin: 0;
}

.page-about .about-origin-figure .figure-media,
.page-about .about-team-figure .figure-media,
.page-about .about-rail-figure {
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--about-violet-line);
  background: var(--c-night);
}

.page-about .about-origin-figure img,
.page-about .about-team-figure img,
.page-about .about-rail-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .figure-caption {
  margin-top: 12px;
  color: var(--c-mist);
  font-size: 0.84rem;
  line-height: 1.65;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  margin-top: clamp(28px, 4vw, 48px);
}

.page-about .about-rail {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 32px;
}

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

.page-about .about-years {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-year-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--about-line);
  color: var(--c-mist);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-year-link:hover,
.page-about .about-year-link:focus-visible {
  color: var(--c-void);
  background: var(--c-neon);
  border-color: var(--c-neon);
}

.page-about .about-year-num {
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  font-variant-numeric: tabular-nums;
}

.page-about .about-year-label {
  letter-spacing: 0.04em;
}

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

.page-about .about-rail-figure img {
  max-height: 190px;
}

.page-about .about-stages {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
  display: grid;
  gap: clamp(16px, 2.6vw, 24px);
}

.page-about .about-stages::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg,
    var(--c-neon) 0%,
    rgba(56, 225, 208, 0.3) 34%,
    var(--c-violet) 68%,
    rgba(255, 179, 92, 0.55) 100%);
  opacity: 0.55;
}

.page-about .about-stage {
  position: relative;
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 26px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--c-void);
  border: 1px solid var(--c-neon);
  box-shadow: 0 0 0 4px rgba(56, 225, 208, 0.1);
}

.page-about .about-stage-card {
  padding: clamp(18px, 2.6vw, 26px);
  border: 1px solid var(--about-line-strong);
  border-left: 1px solid var(--about-violet-line);
  border-radius: 0 var(--radius-m) var(--radius-m) 0;
  background: linear-gradient(100deg, rgba(16, 31, 63, 0.88), rgba(11, 22, 48, 0.55));
}

.page-about .about-stage-year {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.3rem, 3vw, 1.7rem);
  letter-spacing: 0.08em;
  color: var(--c-amber);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stage-title {
  margin: 8px 0 0;
  font-size: clamp(1.02rem, 2vw, 1.16rem);
  font-weight: 500;
  line-height: 1.5;
  color: var(--c-paper);
}

.page-about .about-stage-body {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: 0.95rem;
  line-height: 1.78;
  color: var(--c-mist);
}

/* ---------- 服务范围三层 ---------- */
.page-about .about-scope-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2.4vw, 22px);
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .about-scope-card {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 2.8vw, 28px);
  border-radius: var(--radius-l);
  background: var(--c-paper);
  color: var(--ink-on-paper);
  box-shadow: var(--shadow-soft);
}

.page-about .about-scope-card::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 96px;
  height: 96px;
  background: radial-gradient(circle at 100% 0%, rgba(56, 225, 208, 0.38), transparent 70%);
  pointer-events: none;
}

.page-about .about-scope-index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--ink-soft-on-paper);
}

.page-about .about-scope-title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.15rem, 2.4vw, 1.4rem);
  color: var(--ink-on-paper);
}

.page-about .about-scope-list {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-scope-list li {
  position: relative;
  padding-left: 18px;
  font-size: 0.95rem;
  line-height: 1.72;
  color: var(--ink-soft-on-paper);
}

.page-about .about-scope-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 9px;
  height: 1px;
  background: var(--c-violet);
}

/* ---------- 团队与资质 ---------- */
.page-about .about-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-divisions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-division {
  padding: 16px;
  border-radius: var(--radius-m);
  border: 1px solid var(--about-line);
  background: rgba(16, 31, 63, 0.62);
}

.page-about .about-division-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.65rem;
  letter-spacing: 0.06em;
  color: var(--c-amber);
  font-variant-numeric: tabular-nums;
}

.page-about .about-division-label {
  display: block;
  margin-top: 6px;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  color: var(--c-mist);
}

.page-about .about-cert {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin: 24px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-cert-text {
  flex: 1 1 240px;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--c-mist);
}

/* ---------- 合作与长期运营 ---------- */
.page-about .about-partners .track-divider {
  margin-bottom: clamp(24px, 3.6vw, 40px);
}

.page-about .about-partners-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-partners-facts {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  border-radius: var(--radius-l);
  border: 1px solid var(--glass-line);
  background: var(--glass);
  overflow: hidden;
}

.page-about .about-partners-fact {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 18px 20px;
  background: rgba(11, 22, 48, 0.42);
}

.page-about .about-partners-num {
  flex: 0 0 auto;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.5rem, 3.4vw, 1.9rem);
  letter-spacing: 0.06em;
  color: var(--c-amber);
  font-variant-numeric: tabular-nums;
}

.page-about .about-partners-label {
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--c-mist);
}

/* ---------- 下一步入口带 ---------- */
.page-about .about-band {
  display: flex;
  gap: 14px;
  margin: clamp(24px, 3.6vw, 38px) 0 0;
  padding: 4px 2px 14px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scroll-snap-type: x proximity;
}

.page-about .about-band-item {
  flex: 1 0 min(280px, 78vw);
  scroll-snap-align: start;
}

.page-about .about-band-link {
  display: flex;
  flex-direction: column;
  gap: 10px;
  height: 100%;
  padding: 22px;
  border-radius: var(--radius-l);
  border: 1px solid var(--glass-line);
  background: var(--glass);
  text-decoration: none;
  color: var(--c-paper);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-about .about-band-link:hover,
.page-about .about-band-link:focus-visible {
  border-color: var(--c-neon);
  background: rgba(16, 31, 63, 0.9);
  transform: translateY(-3px);
}

.page-about .about-band-index {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--c-neon);
}

.page-about .about-band-title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.2rem;
  color: var(--c-paper);
}

.page-about .about-band-note {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--c-mist);
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .about-scope-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-rail-figure img {
    max-height: 240px;
  }
}

@media (min-width: 940px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: end;
  }

  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    align-items: center;
  }

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

@media (min-width: 960px) {
  .page-about .about-timeline {
    display: grid;
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(30px, 4.5vw, 64px);
  }

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

  .page-about .about-years {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }

  .page-about .about-year-link {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    align-items: baseline;
    gap: 12px;
    padding: 9px 10px 9px 15px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: transparent;
    font-size: 0.88rem;
  }

  .page-about .about-year-link:hover,
  .page-about .about-year-link:focus-visible {
    color: var(--c-neon);
    background: rgba(56, 225, 208, 0.08);
    border-left-color: var(--c-neon);
  }

  .page-about .about-year-num {
    font-family: var(--font-display);
    font-size: 1.02rem;
    color: var(--c-paper);
  }

  .page-about .about-rail-figure img {
    max-height: 300px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-rail-figure img {
    max-height: 340px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-band-link,
  .page-about .about-year-link {
    transition: none;
  }

  .page-about .about-band-link:hover,
  .page-about .about-band-link:focus-visible {
    transform: none;
  }
}