.page-about {
  --about-divider-gradient: linear-gradient(90deg, var(--color-accent), var(--color-accent-2));
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* 首屏 */
.page-about__hero {
  position: relative;
  padding: var(--space-lg) 0;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 12% 22%, rgba(255,45,149,0.16), transparent 45%),
    radial-gradient(ellipse at 88% 68%, rgba(0,229,255,0.1), transparent 42%),
    linear-gradient(180deg, var(--color-panel) 0%, var(--color-bg) 100%);
  border-bottom: 1px solid var(--color-border-blue);
}

.page-about__hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 220px;
  height: 220px;
  background: repeating-linear-gradient(45deg, rgba(255,45,149,0.06) 0 1px, transparent 1px 14px);
  pointer-events: none;
}

.page-about__breadcrumbs {
  margin-bottom: var(--space-md);
  position: relative;
  z-index: 1;
}

.page-about__hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  align-items: center;
  position: relative;
  z-index: 1;
}

.page-about__hero-copy {
  max-width: 640px;
}

.page-about__hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 7vw, 3.4rem);
  line-height: 1.12;
  margin: var(--space-sm) 0 var(--space-md);
  letter-spacing: 0.01em;
  color: var(--color-text);
  text-shadow: 0 0 26px rgba(255,45,149,0.28), 0 0 52px rgba(0,229,255,0.12);
}

.page-about__hero-title em {
  font-style: italic;
  color: var(--color-accent);
}

.page-about__hero-lead {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text-muted);
  margin: 0 0 var(--space-md);
}

.page-about__hero-lead strong {
  color: var(--color-accent-2);
  font-weight: 600;
}

.page-about__hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  align-items: center;
}

.page-about__hero-media {
  margin: 0;
  position: relative;
  border-radius: var(--radius) 0 var(--radius) 0;
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: 0 24px 48px rgba(10,6,20,0.6), 0 8px 24px rgba(255,45,149,0.12);
  transform: rotate(-1.2deg);
}

.page-about__hero-media img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about__hero-caption {
  position: absolute;
  right: 0;
  bottom: 0;
  background: rgba(10,6,20,0.75);
  backdrop-filter: blur(6px);
  border-top-left-radius: var(--radius);
  padding: 0.4rem 0.75rem;
  font-size: 0.75rem;
  color: var(--color-accent-2);
  letter-spacing: 0.08em;
}

/* 主体布局 */
.page-about__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  padding: var(--space-xl) 0;
}

.page-about__toc-wrap {
  position: relative;
}

.page-about__toc {
  background: var(--color-glass);
  backdrop-filter: blur(10px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-md);
  margin-bottom: var(--space-md);
  position: relative;
  overflow: hidden;
}

.page-about__toc::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: var(--about-divider-gradient);
}

.page-about__toc-label {
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin: 0 0 var(--space-sm);
}

.page-about__toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: toc-item;
}

.page-about__toc-list li {
  margin: 0;
  border-bottom: 1px solid rgba(0,229,255,0.1);
  counter-increment: toc-item;
}

.page-about__toc-list li:last-child {
  border-bottom: 0;
}

.page-about__toc-list a {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  padding: 0.65rem 0.25rem;
  border-radius: 4px;
  transition: color 0.2s ease, padding-left 0.2s ease, background 0.2s ease;
}

.page-about__toc-list a::before {
  content: "0" counter(toc-item);
  font-family: var(--font-heading);
  color: var(--color-accent);
  font-weight: 700;
  font-size: 0.85rem;
}

.page-about__toc-list a:hover {
  color: var(--color-accent-2);
  padding-left: 0.6rem;
  background: rgba(0,229,255,0.05);
}

.page-about__toc-note {
  margin-top: var(--space-sm);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--color-border-blue);
  font-size: 0.78rem;
  color: var(--color-text-dim);
  line-height: 1.6;
}

.page-about__toc-note p:first-child {
  margin: 0 0 0.4rem;
  color: var(--color-text-muted);
}

.page-about__toc-note .tag {
  margin: 0.2rem 0.3rem 0.2rem 0;
}

.page-about__articles {
  min-width: 0;
}

/* 章节 */
.page-about__section {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid rgba(184,168,224,0.16);
}

.page-about__section:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-about__section .section-heading {
  margin-bottom: var(--space-sm);
}

.page-about__section-lead {
  margin: var(--space-sm) 0 var(--space-md);
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.page-about__body-text p {
  margin: 0 0 var(--space-sm);
  line-height: 1.8;
  color: var(--color-text-muted);
  font-size: 0.96rem;
}

.page-about__body-text strong {
  color: var(--color-accent-2);
  font-weight: 600;
}

.page-about__quote {
  margin: var(--space-md) 0;
  padding: var(--space-sm) var(--space-md);
  border-left: 3px solid var(--color-accent);
  background: linear-gradient(135deg, rgba(255,45,149,0.1), transparent 70%);
  font-family: var(--font-heading);
  font-size: 1.15rem;
  line-height: 1.5;
  color: var(--color-text);
}

/* 时间轴 */
.page-about__timeline {
  margin-top: var(--space-lg);
}

.page-about__timeline-head {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.page-about__timeline-icon {
  border-radius: 6px;
  border: 1px solid var(--color-border-blue);
  box-shadow: 0 0 14px rgba(0,229,255,0.25);
  width: 40px;
  height: 40px;
  flex: 0 0 auto;
}

.page-about__timeline-head-text {
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-accent-2);
  font-size: 0.9rem;
  text-transform: uppercase;
}

.page-about__timeline-list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  margin-left: 14px;
  border-left: 1px solid var(--color-border);
}

.page-about__timeline-item {
  position: relative;
  margin: 0;
  padding: var(--space-xs) 0 var(--space-md) var(--space-lg);
}

.page-about__timeline-item::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 18px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 2px solid var(--color-accent);
  box-shadow: 0 0 10px rgba(255,45,149,0.55);
}

.page-about__timeline-year {
  display: block;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--color-accent);
  margin-bottom: 0.2rem;
}

.page-about__timeline-item p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--color-text-muted);
}

/* 补录流程 */
.page-about__workflow {
  border: 1px solid rgba(0,229,255,0.16);
  border-radius: var(--radius);
  overflow: hidden;
  background: rgba(21,11,46,0.38);
}

.page-about__workflow-trigger {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  width: 100%;
  min-height: 58px;
  padding: var(--space-sm) var(--space-md);
  background: rgba(21,11,46,0.65);
  border: 0;
  border-bottom: 1px solid rgba(0,229,255,0.1);
  color: var(--color-text);
  cursor: pointer;
  text-align: left;
  transition: background 0.2s ease;
}

.page-about__workflow-trigger:hover {
  background: rgba(255,45,149,0.08);
}

.page-about__workflow-trigger[aria-expanded="true"] {
  background: rgba(0,229,255,0.07);
  border-bottom-color: rgba(255,45,149,0.3);
}

.page-about__step-num {
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-accent);
  border: 1px solid var(--color-border);
  background: rgba(255,45,149,0.08);
}

.page-about__step-title {
  flex: 1;
  font-weight: 600;
  font-size: 0.95rem;
}

.page-about__workflow-trigger .accordion__icon {
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 1px solid var(--color-border-blue);
  position: relative;
}

.page-about__workflow-trigger .accordion__icon::before,
.page-about__workflow-trigger .accordion__icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background: var(--color-accent-2);
  transform: translate(-50%, -50%);
}

.page-about__workflow-trigger .accordion__icon::before {
  width: 8px;
  height: 1.5px;
}

.page-about__workflow-trigger .accordion__icon::after {
  width: 1.5px;
  height: 8px;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.page-about__workflow-trigger[aria-expanded="true"] .accordion__icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
  opacity: 0;
}

.page-about__workflow .accordion__panel {
  background: rgba(10,6,20,0.45);
}

.page-about__workflow .accordion__panel-inner {
  padding: var(--space-sm) var(--space-md) var(--space-md);
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--color-text-muted);
}

/* 运营规模 */
.page-about__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm);
  margin: var(--space-md) 0 var(--space-lg);
}

.page-about__stat-card {
  position: relative;
  padding: var(--space-md);
  background: var(--color-panel);
  border: 1px solid rgba(255,45,149,0.22);
  overflow: hidden;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.page-about__stat-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--about-divider-gradient);
}

.page-about__stat-card:hover {
  border-color: rgba(255,45,149,0.55);
  box-shadow: 0 10px 28px rgba(255,45,149,0.14), 0 4px 12px rgba(0,229,255,0.08);
}

.page-about__stat-num {
  display: block;
  font-family: var(--font-heading);
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.15;
}

.page-about__stat-label {
  display: block;
  margin-top: var(--space-xs);
  font-size: 0.76rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  letter-spacing: 0.02em;
}

.page-about__chart {
  margin: var(--space-lg) 0;
}

.page-about__chart img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--color-border-blue);
  transition: box-shadow 0.2s ease;
}

.page-about__chart img:hover {
  box-shadow: 0 8px 24px rgba(0,229,255,0.15);
}

.page-about__chart figcaption {
  margin-top: var(--space-xs);
  font-size: 0.78rem;
  color: var(--color-text-dim);
  text-align: right;
}

.page-about__scale-note {
  margin: var(--space-md) 0 0;
  padding: var(--space-sm) var(--space-md);
  background: rgba(0,229,255,0.06);
  border-left: 2px solid var(--color-accent-2);
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--color-text-muted);
}

/* 内容标准 */
.page-about__standards-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-sm);
}

.page-about__standards-item {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md) var(--space-sm) var(--space-sm);
  background: rgba(21,11,46,0.42);
  border-radius: var(--radius);
  border-left: 2px solid var(--color-accent-2);
  transition: background 0.2s ease, border-left-color 0.2s ease;
}

.page-about__standards-item:hover {
  background: rgba(21,11,46,0.7);
  border-left-color: var(--color-accent);
}

.page-about__standards-num {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--color-accent);
  line-height: 1.2;
}

.page-about__standards-item h3 {
  margin: 0 0 0.3rem;
  font-size: 1rem;
  color: var(--color-text);
}

.page-about__standards-item p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--color-text-muted);
}

/* 底部 CTA */
.page-about__footer-cta {
  margin-top: var(--space-xl);
  padding: var(--space-lg) var(--space-md);
  background:
    linear-gradient(135deg, rgba(255,45,149,0.1), transparent 60%),
    var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
}

.page-about__footer-cta::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--about-divider-gradient);
}

.page-about__footer-cta-title {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0 0 var(--space-xs);
}

.page-about__footer-cta p:not(.page-about__footer-cta-title) {
  color: var(--color-text-muted);
  font-size: 0.92rem;
  line-height: 1.7;
  margin: 0 0 var(--space-md);
}

.page-about__footer-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.page-about__footer-cta-links .btn {
  text-decoration: none;
}

/* 响应式增强 */
@media (min-width: 768px) {
  .page-about__hero {
    padding: var(--space-xl) 0;
  }

  .page-about__hero-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }

  .page-about__stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about__standards-list {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .page-about__layout {
    grid-template-columns: 240px minmax(0, 1fr);
    align-items: start;
    gap: var(--space-xl);
  }

  .page-about__toc-wrap {
    position: sticky;
    top: calc(var(--space-xl) + 30px);
  }

  .page-about__toc {
    margin-bottom: 0;
  }

  .page-about__hero-title {
    font-size: 3.4rem;
  }
}