/* ===== page-about 专属样式 ===== */
.page-about {
  --about-hero-min-height: 320px;
  --about-hero-overlay-bg: rgba(13, 13, 13, 0.65);
  --about-card-min-height: 140px;
  --about-gov-bg: rgba(255, 255, 255, 0.04);
  --about-gov-border: rgba(255, 215, 0, 0.25);
  --about-contact-gap: 1.5rem;
  --about-inline-accent: #00D4FF;
  max-width: 100%;
  overflow-x: hidden;
  padding: 0;
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
  padding: 0.75rem 1rem;
  font-family: var(--font-body, "Inter", sans-serif);
  font-size: var(--fs-caption, 0.85rem);
  color: var(--color-gray, #A0A0A0);
}
.page-about .breadcrumb a {
  color: var(--color-gray, #A0A0A0);
  text-decoration: none;
  transition: color var(--transition, 0.3s ease);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--color-gold, #FFD700);
}
.page-about .breadcrumb-sep {
  color: var(--color-gold, #FFD700);
  font-weight: var(--fw-bold, 700);
}
.page-about .breadcrumb-current {
  color: var(--color-white, #F5F5F5);
  font-weight: var(--fw-bold, 700);
}

/* ===== 英雄区域 ===== */
.page-about .about-hero {
  position: relative;
  min-height: var(--about-hero-min-height);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  margin-bottom: var(--space-xl, 3rem);
}
.page-about .about-hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.page-about .about-hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  display: block;
}
.page-about .about-hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 2rem 1rem;
  background: var(--about-hero-overlay-bg);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  width: 100%;
}
.page-about .about-hero-title {
  font-family: var(--font-heading, "Oswald", sans-serif);
  font-size: var(--fs-h1, clamp(2.8rem, 8vw, 4.5rem));
  font-weight: var(--fw-black, 900);
  color: var(--color-white, #F5F5F5);
  margin: 0 0 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.page-about .about-hero-sub {
  font-family: var(--font-body, "Inter", sans-serif);
  font-size: var(--fs-h3, clamp(1.4rem, 3vw, 2rem));
  font-weight: var(--fw-bold, 700);
  color: var(--color-gold, #FFD700);
  margin: 0 0 0.5rem;
}
.page-about .about-hero-desc {
  font-family: var(--font-body, "Inter", sans-serif);
  font-size: var(--fs-body, 1rem);
  color: var(--color-gray, #A0A0A0);
  margin: 0;
  letter-spacing: 0.06em;
}

/* ===== 章节通用 ===== */
.page-about .section-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg, 2rem);
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
  padding: var(--space-lg, 2rem) 1rem;
}
.page-about .section-narrow {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm, 0.5rem);
}
.page-about .section-wide {
  flex: 1 1 100%;
}
.page-about .section-label {
  font-family: var(--font-heading, "Oswald", sans-serif);
  font-size: var(--fs-h2, clamp(2rem, 5vw, 3rem));
  font-weight: var(--fw-bold, 700);
  color: var(--color-white, #F5F5F5);
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  line-height: 1.1;
}
.page-about .section-narrow .tag {
  align-self: flex-start;
  margin-top: var(--space-xs, 0.25rem);
}

/* ===== 我们的定位 ===== */
.page-about .about-mission-block {
  display: flex;
  flex-direction: column;
  gap: var(--space-md, 1rem);
  margin-bottom: var(--space-lg, 2rem);
}
.page-about .about-mission-text {
  font-family: var(--font-body, "Inter", sans-serif);
  font-size: var(--fs-body, 1rem);
  line-height: 1.7;
  color: var(--color-white, #F5F5F5);
  margin: 0;
}
.page-about .about-mission-text strong {
  color: var(--color-gold, #FFD700);
  font-weight: var(--fw-bold, 700);
}
.page-about .about-mission-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md, 1rem);
  margin-top: var(--space-sm, 0.5rem);
}
.page-about .about-mission-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md, 8px);
  display: block;
  margin-top: var(--space-md, 1rem);
}

/* ===== 数据服务 ===== */
.page-about .about-data-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md, 1rem);
  margin-bottom: var(--space-lg, 2rem);
}
.page-about .about-data-card {
  background: var(--color-glass, rgba(255,255,255,0.08));
  border-radius: var(--radius-md, 8px);
  padding: var(--space-md, 1rem);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  border-left: 3px solid transparent;
  transition: border-color var(--transition, 0.3s ease), transform var(--transition, 0.3s ease);
  min-height: var(--about-card-min-height);
}
.page-about .about-data-card:hover {
  border-left-color: var(--color-gold, #FFD700);
  transform: translateX(4px);
}
.page-about .about-data-card .card-label {
  font-family: var(--font-heading, "Oswald", sans-serif);
  font-size: var(--fs-caption, 0.85rem);
  text-transform: uppercase;
  color: var(--color-gray, #A0A0A0);
  letter-spacing: 0.05em;
}
.page-about .about-data-card .card-value {
  font-family: var(--font-heading, "Oswald", sans-serif);
  font-size: var(--fs-h3, clamp(1.4rem, 3vw, 2rem));
  font-weight: var(--fw-bold, 700);
  background: var(--gradient-cyber, linear-gradient(135deg, #00D4FF, #8B5CF6));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}
.page-about .about-data-card .card-meta {
  font-family: var(--font-body, "Inter", sans-serif);
  font-size: var(--fs-caption, 0.85rem);
  color: var(--color-gray, #A0A0A0);
  margin: 0;
}
.page-about .about-data-details {
  margin-bottom: var(--space-md, 1rem);
  background: var(--color-glass, rgba(255,255,255,0.08));
  border-radius: var(--radius-md, 8px);
  overflow: hidden;
  transition: background var(--transition, 0.3s ease);
}
.page-about .about-data-details[open] {
  background: rgba(255,255,255,0.12);
}
.page-about .about-data-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md, 1rem);
  font-family: var(--font-body, "Inter", sans-serif);
  font-size: var(--fs-body, 1rem);
  font-weight: var(--fw-bold, 700);
  color: var(--color-gold, #FFD700);
  cursor: pointer;
  list-style: none;
  user-select: none;
}
.page-about .about-data-summary::-webkit-details-marker {
  display: none;
}
.page-about .about-data-summary:hover,
.page-about .about-data-summary:focus-visible {
  background: rgba(255, 255, 255, 0.04);
}
.page-about .about-data-summary-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-gold, #FFD700);
  color: var(--color-black, #0D0D0D);
  font-weight: var(--fw-black, 900);
  font-size: 1.2rem;
  line-height: 1;
  transition: transform var(--transition, 0.3s ease);
}
.page-about .about-data-details[open] .about-data-summary-icon {
  transform: rotate(45deg);
  background: var(--color-red, #E60000);
  color: var(--color-white, #F5F5F5);
}
.page-about .about-data-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm, 0.5rem);
  padding: 0 var(--space-md, 1rem) var(--space-md, 1rem);
}
.page-about .about-data-list .tag {
  font-size: var(--fs-caption, 0.85rem);
  padding: 0.3rem 0.75rem;
}
.page-about .about-data-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md, 8px);
  display: block;
  margin-bottom: var(--space-sm, 0.5rem);
}
.page-about .about-data-footnote {
  font-family: var(--font-body, "Inter", sans-serif);
  font-size: var(--fs-caption, 0.85rem);
  color: var(--color-gray, #A0A0A0);
  margin: 0;
  line-height: 1.5;
}
.page-about .about-inline-link {
  color: var(--about-inline-accent);
  text-decoration: none;
  font-weight: var(--fw-bold, 700);
  transition: color var(--transition, 0.3s ease);
}
.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--color-gold, #FFD700);
  text-decoration: underline;
}

/* ===== 治理透明 ===== */
.page-about .about-gov-card {
  background: var(--about-gov-bg);
  border: 1px solid var(--about-gov-border);
  border-radius: var(--radius-lg, 16px);
  padding: var(--space-lg, 2rem);
  display: flex;
  flex-direction: column;
  gap: var(--space-md, 1rem);
  position: relative;
  overflow: hidden;
}
.page-about .about-gov-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--gradient-cyber, linear-gradient(135deg, #00D4FF, #8B5CF6));
  border-radius: 2px 0 0 2px;
}
.page-about .about-gov-icon {
  flex-shrink: 0;
  opacity: 0.85;
}
.page-about .about-gov-title {
  font-family: var(--font-heading, "Oswald", sans-serif);
  font-size: var(--fs-h3, clamp(1.4rem, 3vw, 2rem));
  font-weight: var(--fw-bold, 700);
  color: var(--color-gold, #FFD700);
  margin: 0;
  text-transform: uppercase;
}
.page-about .about-gov-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm, 0.5rem);
}
.page-about .about-gov-list li {
  font-family: var(--font-body, "Inter", sans-serif);
  font-size: var(--fs-body, 1rem);
  line-height: 1.6;
  color: var(--color-white, #F5F5F5);
  padding-left: 1.5rem;
  position: relative;
}
.page-about .about-gov-list li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--color-cyan, #00D4FF);
  font-weight: var(--fw-bold, 700);
}
.page-about .about-gov-list li strong {
  color: var(--color-gold, #FFD700);
  font-weight: var(--fw-bold, 700);
}
.page-about .about-gov-statement {
  font-family: var(--font-body, "Inter", sans-serif);
  font-size: var(--fs-caption, 0.85rem);
  color: var(--color-gray, #A0A0A0);
  font-style: italic;
  padding: var(--space-sm, 0.5rem) var(--space-md, 1rem);
  border-left: 2px solid var(--color-gold, #FFD700);
  margin: var(--space-sm, 0.5rem) 0 0;
}

/* ===== 联系我们 ===== */
.page-about .about-contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-contact-gap);
}
.page-about .about-contact-item {
  background: var(--color-glass, rgba(255,255,255,0.08));
  border-radius: var(--radius-md, 8px);
  padding: var(--space-md, 1rem);
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition, 0.3s ease), background var(--transition, 0.3s ease);
}
.page-about .about-contact-item:hover {
  border-bottom-color: var(--color-cyan, #00D4FF);
  background: rgba(255, 255, 255, 0.12);
}
.page-about .about-contact-label {
  font-family: var(--font-heading, "Oswald", sans-serif);
  font-size: var(--fs-caption, 0.85rem);
  text-transform: uppercase;
  color: var(--color-gray, #A0A0A0);
  letter-spacing: 0.04em;
}
.page-about .about-contact-value {
  font-family: var(--font-body, "Inter", sans-serif);
  font-size: var(--fs-body, 1rem);
  font-weight: var(--fw-bold, 700);
  color: var(--color-white, #F5F5F5);
  text-decoration: none;
  transition: color var(--transition, 0.3s ease);
  word-break: break-all;
}
.page-about a.about-contact-value:hover,
.page-about a.about-contact-value:focus-visible {
  color: var(--color-cyan, #00D4FF);
}
.page-about .about-contact-hint {
  font-family: var(--font-body, "Inter", sans-serif);
  font-size: var(--fs-small, 0.75rem);
  color: var(--color-gray, #A0A0A0);
  margin-top: 0.15rem;
}
.page-about .about-contact-cta {
  margin-top: var(--space-md, 1rem);
  display: flex;
}

/* ===== 桌面端 (768px+) ===== */
@media (min-width: 768px) {
  .page-about {
    --about-hero-min-height: 420px;
    --about-card-min-height: 160px;
  }
  .page-about .breadcrumb {
    padding: 0.75rem 2rem;
  }
  .page-about .section-panel {
    flex-direction: row;
    gap: var(--space-xl, 3rem);
    padding: var(--space-xl, 3rem) 2rem;
  }
  .page-about .section-narrow {
    flex: 0 0 220px;
    max-width: 220px;
    position: sticky;
    top: calc(var(--header-height, 68px) + 1rem);
    align-self: flex-start;
  }
  .page-about .section-wide {
    flex: 1 1 0;
    min-width: 0;
  }
  .page-about .about-hero-content {
    padding: 3rem 2rem;
  }
  .page-about .about-data-grid {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .about-mission-cta {
    flex-direction: row;
  }
  .page-about .about-contact-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* ===== 宽屏 (1024px+) ===== */
@media (min-width: 1024px) {
  .page-about {
    --about-hero-min-height: 520px;
  }
  .page-about .breadcrumb {
    padding: 0.75rem 2rem;
  }
  .page-about .section-panel {
    padding: var(--space-2xl, 5rem) 2rem;
    gap: 4rem;
  }
  .page-about .section-narrow {
    flex: 0 0 260px;
    max-width: 260px;
  }
  .page-about .about-data-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .about-contact-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .about-hero-title {
    font-size: 5rem;
  }
  .page-about .about-hero-sub {
    font-size: 2.2rem;
  }
}

/* ===== 超大屏 (1440px+) ===== */
@media (min-width: 1440px) {
  .page-about .section-panel {
    padding-left: 0;
    padding-right: 0;
  }
}

/* ===== 安全间距 & 辅助 ===== */
.page-about .trust-statement {
  display: block;
}
.page-about [data-copy] {
  cursor: copy;
  position: relative;
}
.page-about [data-copy]:hover::after {
  content: "📋 复制";
  position: absolute;
  right: -3.5rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.65rem;
  font-family: var(--font-body, "Inter", sans-serif);
  color: var(--color-gold, #FFD700);
  background: rgba(13, 13, 13, 0.85);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm, 4px);
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition, 0.3s ease);
}
.page-about [data-copy]:hover::after {
  opacity: 1;
}

/* ===== 打印优化 ===== */
@media print {
  .page-about .about-hero {
    min-height: auto;
    page-break-inside: avoid;
  }
  .page-about .about-hero-bg {
    display: none;
  }
  .page-about .about-hero-content {
    background: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    color: #000;
  }
  .page-about .about-hero-title,
  .page-about .about-hero-sub,
  .page-about .about-hero-desc {
    color: #000;
  }
  .page-about .section-panel {
    page-break-inside: avoid;
  }
  .page-about .about-data-card .card-value {
    -webkit-text-fill-color: #0055aa;
    color: #0055aa;
  }
}