.page-about {
  background: var(--c-void);
  color: var(--body-text);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 26px 0 56px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(56, 224, 123, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(56, 224, 123, 0.055) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(ellipse 72% 82% at 78% 22%, #000 0%, transparent 72%);
  mask-image: radial-gradient(ellipse 72% 82% at 78% 22%, #000 0%, transparent 72%);
  pointer-events: none;
}

.page-about .breadcrumbs {
  position: relative;
  z-index: 1;
  margin-bottom: 30px;
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
}

.page-about .about-hero-copy {
  min-width: 0;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 6.2vw, 3.75rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--c-white);
  margin: 12px 0 20px;
  max-width: 18ch;
}

.page-about .about-hero-lead {
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--body-text);
  max-width: 52ch;
  margin: 0;
}

.page-about .about-hero-meta {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 26px 0 0;
  padding: 0;
}

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

/* ---------- 通用区块头 ---------- */

.page-about .about-section-head {
  border-top: 1px solid var(--rule);
  padding-top: 22px;
  margin-bottom: 36px;
}

.page-about .about-section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 4.4vw, 2.5rem);
  line-height: 1.28;
  color: var(--c-white);
  margin: 10px 0 14px;
  max-width: 22ch;
}

.page-about .about-section-sub {
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--c-steel);
  max-width: 58ch;
  margin: 0;
}

/* ---------- 图片框 ---------- */

.page-about .media-frame {
  position: relative;
  margin: 0;
  overflow: hidden;
  background: var(--c-night);
  border: 1px solid var(--rule-strong);
  box-shadow: 9px 9px 0 -1px rgba(56, 224, 123, 0.14);
}

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

/* ---------- 时间轴 ---------- */

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

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-green) 0%, rgba(56, 224, 123, 0.22) 55%, rgba(56, 224, 123, 0.04) 100%);
}

.page-about .timeline-item {
  position: relative;
  padding-left: 34px;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 21px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-void);
  border: 2px solid var(--c-green);
  z-index: 1;
}

.page-about .timeline-trigger {
  width: 100%;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 16px 4px 16px 0;
  margin: 0;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--rule);
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: border-color var(--dur) ease;
}

.page-about .timeline-trigger:hover {
  border-bottom-color: rgba(56, 224, 123, 0.45);
}

.page-about .timeline-trigger:focus-visible {
  outline: 2px solid var(--c-green);
  outline-offset: 3px;
}

.page-about .timeline-mark {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--c-green);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.page-about .timeline-title {
  font-family: var(--font-display);
  font-size: var(--fs-20);
  line-height: 1.4;
  color: var(--c-white);
  min-width: 0;
}

.page-about .timeline-toggle {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--c-steel);
  border: 1px solid var(--rule);
  padding: 4px 9px;
  white-space: nowrap;
  transition: color var(--dur) ease, border-color var(--dur) ease;
}

.page-about .timeline-trigger:hover .timeline-toggle,
.page-about .timeline-trigger[aria-expanded="true"] .timeline-toggle {
  color: var(--c-green);
  border-color: rgba(56, 224, 123, 0.5);
}

.page-about .timeline-panel {
  padding: 4px 0 22px;
}

.page-about .timeline-panel p {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--body-text);
  max-width: 62ch;
}

/* ---------- 团队工序 ---------- */

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

.page-about .team-card {
  position: relative;
  border: 1px solid var(--rule);
  background: var(--c-night);
  padding: 22px 20px 24px;
  transition: border-color var(--dur) ease, transform var(--dur) ease;
}

.page-about .team-card::after {
  content: "";
  position: absolute;
  left: 20px;
  right: 20px;
  top: 0;
  height: 2px;
  background: rgba(56, 224, 123, 0.28);
}

.page-about .team-card:hover {
  border-color: rgba(56, 224, 123, 0.42);
  transform: translateY(-3px);
}

.page-about .team-card-index {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--c-green);
  margin: 0 0 12px;
}

.page-about .team-card-title {
  font-family: var(--font-display);
  font-size: var(--fs-20);
  line-height: 1.42;
  color: var(--c-white);
  margin: 0 0 12px;
}

.page-about .team-card-text {
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--body-text);
  margin: 0;
}

.page-about .about-team-figure {
  margin-top: 26px;
}

/* ---------- 版本演进 ---------- */

.page-about .version-track {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  position: relative;
}

.page-about .version-card {
  position: relative;
  border: 1px solid var(--rule);
  border-top: 2px solid rgba(124, 141, 163, 0.5);
  background: rgba(18, 41, 74, 0.55);
  padding: 20px 18px 22px;
}

.page-about .version-card--current {
  border-top-color: var(--c-green);
  background: rgba(20, 58, 44, 0.6);
}

.page-about .version-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-20);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-steel);
  margin: 0 0 10px;
}

.page-about .version-badge--current {
  color: var(--c-green);
}

.page-about .version-name {
  font-family: var(--font-body);
  font-size: var(--fs-16);
  font-weight: 700;
  color: var(--c-white);
  margin: 0 0 10px;
}

.page-about .version-text {
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--body-text);
  margin: 0;
}

/* ---------- 读者画像 ---------- */

.page-about .reader-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-about .reader-stats {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.page-about .stat {
  background: var(--c-void);
  padding: 18px 16px 20px;
  min-width: 0;
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 5.4vw, 2.1rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-white);
  font-variant-numeric: tabular-nums;
  margin-bottom: 8px;
}

.page-about .stat:nth-child(4) .stat-num {
  color: var(--c-green-soft);
}

.page-about .stat-label {
  display: block;
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--c-steel);
  line-height: 1.6;
}

.page-about .reader-note {
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--body-text);
  margin: 0;
  max-width: 58ch;
}

.page-about .reader-figure {
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.page-about .reader-figure svg {
  width: min(240px, 62vw);
  height: auto;
  display: block;
}

.page-about .reader-figure figcaption {
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--c-steel);
  text-align: center;
  max-width: 34ch;
}

/* ---------- 合作生态 ---------- */

.page-about .partners-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-about .partners-list {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  border-top: 1px solid var(--rule);
}

.page-about .partner-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding: 18px 0;
  border-bottom: 1px solid var(--rule);
}

.page-about .partner-num {
  font-size: clamp(1.75rem, 6vw, 2.5rem);
  line-height: 1;
  font-weight: 700;
}

.page-about .partner-text {
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--body-text);
  min-width: 0;
}

.page-about .partners-note {
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--body-text);
  margin: 0;
  max-width: 56ch;
}

.page-about .partners-note a {
  color: var(--c-green);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .partners-note a:hover {
  color: var(--c-green-soft);
}

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

/* ---------- 广东现场 ---------- */

.page-about .local-band {
  position: relative;
  border: 1px solid var(--rule-strong);
  background: linear-gradient(150deg, rgba(20, 58, 44, 0.85) 0%, rgba(18, 41, 74, 0.85) 62%, rgba(10, 26, 47, 0.95) 100%);
  padding: 34px 22px 38px;
  overflow: hidden;
}

.page-about .local-band::before {
  content: "";
  position: absolute;
  right: -60px;
  top: -60px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(56, 224, 123, 0.18) 0%, transparent 68%);
  pointer-events: none;
}

.page-about .local-title {
  position: relative;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4.4vw, 2.25rem);
  line-height: 1.3;
  color: var(--c-white);
  margin: 10px 0 18px;
  max-width: 20ch;
}

.page-about .local-copy {
  position: relative;
  font-size: var(--fs-16);
  line-height: 1.9;
  color: var(--body-text);
  margin: 0 0 16px;
  max-width: 60ch;
}

.page-about .cta-row {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 36px 0 72px;
  }

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

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

  .page-about .reader-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .local-band {
    padding: 46px 40px 52px;
  }

  .page-about .timeline-trigger {
    gap: 18px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 52px;
    align-items: center;
  }

  .page-about .timeline-item {
    padding-left: 42px;
  }

  .page-about .timeline-trigger {
    grid-template-columns: 9ch minmax(0, 1fr) auto;
  }

  .page-about .reader-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 44px;
    align-items: center;
  }

  .page-about .partners-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 44px;
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .version-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-hero {
    padding: 44px 0 88px;
  }

  .page-about .about-section-head {
    margin-bottom: 46px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .timeline-trigger,
  .page-about .timeline-toggle {
    transition: none;
  }

  .page-about .team-card:hover {
    transform: none;
  }
}