.page-about {
  --color-about-bg-start: #0a0a0f;
  --color-about-bg-mid: #1a1a2e;
  --color-about-bg-end: #16213e;
  --color-about-accent: #8b5cf6;
  --color-about-accent-glow: rgba(139,92,246,0.25);
  --color-about-line: rgba(139,92,246,0.25);
  --color-about-dot: #8b5cf6;
  --color-about-dot-inactive: rgba(139,92,246,0.2);
  --color-about-text: #e2e8f0;
  --color-about-text-secondary: #94a3b8;
  --color-about-border: rgba(139,92,246,0.2);
  --color-about-card-bg: rgba(26,26,46,0.6);
  --font-about-mono: 'JetBrains Mono', 'Courier New', monospace;
  --font-about-heading: 'Orbitron', 'Arial Black', 'Impact', sans-serif;
  --font-about-body: 'Noto Sans SC', 'Microsoft YaHei', 'PingFang SC', system-ui, sans-serif;
  --about-panel-max: 1200px;
  --about-panel-padding: 1.25rem;
  --about-indicator-width: 32px;
  display: block;
  width: 100%;
  background: var(--color-about-bg-start);
  position: relative;
}

/* ===== 容器 ===== */
.page-about__container {
  max-width: var(--about-panel-max);
  margin: 0 auto;
  padding: 0 var(--about-panel-padding);
  display: flex;
  gap: 0;
  position: relative;
}

/* ===== 左侧章节指示器 ===== */
.page-about__indicator {
  position: sticky;
  top: 80px;
  left: 0;
  width: var(--about-indicator-width);
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding-top: 3rem;
  z-index: 10;
  height: fit-content;
}

.page-about__indicator-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-about-dot-inactive);
  border: 1.5px solid var(--color-about-line);
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  cursor: default;
  flex-shrink: 0;
}

.page-about__indicator-dot.active {
  background: var(--color-about-dot);
  box-shadow: 0 0 8px var(--color-about-accent-glow), 0 0 16px var(--color-about-accent-glow);
  transform: scale(1.2);
  border-color: var(--color-about-dot);
}

.page-about__indicator-line {
  width: 1px;
  flex: 1;
  min-height: 16px;
  background: var(--color-about-line);
}

/* ===== 面板堆叠 ===== */
.page-about__panels {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.page-about__panel {
  width: 100%;
  padding: 3rem 0 3rem 1.25rem;
  position: relative;
  transition: background var(--transition-smooth);
}

.page-about__panel--hero {
  background: var(--color-about-bg-start);
  padding-top: 1.5rem;
}

.page-about__panel--data {
  background: var(--color-about-bg-mid);
}

.page-about__panel--contact {
  background: var(--color-about-bg-end);
}

.page-about__panel-inner {
  max-width: var(--about-panel-max);
  margin: 0 auto;
}

/* ===== 面包屑 ===== */
.page-about__breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-family: var(--font-about-mono);
  color: var(--color-about-text-secondary);
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-about-line);
}

.page-about__breadcrumb a {
  color: var(--color-about-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.page-about__breadcrumb a:hover {
  color: var(--color-about-accent);
}

.page-about__breadcrumb-sep {
  color: var(--color-about-line);
}

.page-about__breadcrumb-current {
  color: var(--color-about-text);
  font-weight: 600;
}

/* ===== 通用文字 ===== */
.page-about__suptitle {
  display: inline-block;
  font-family: var(--font-about-mono);
  font-size: 0.7rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-about-accent);
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--color-about-border);
  margin-bottom: 0.75rem;
  background: rgba(139,92,246,0.06);
}

.page-about__section-title {
  font-family: var(--font-about-heading);
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: 3px;
  line-height: 1.2;
  margin: 0 0 0.5rem 0;
  filter: drop-shadow(0 0 6px var(--color-about-accent-glow));
}

.page-about__section-desc {
  font-family: var(--font-about-body);
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-about-text-secondary);
  max-width: 640px;
  margin: 0 0 1.5rem 0;
}

/* ===== 首屏 ===== */
.page-about__hero-content {
  display: flex;
  align-items: flex-start;
  gap: 2rem;
  flex-wrap: wrap;
}

.page-about__hero-text {
  flex: 1 1 300px;
  min-width: 0;
}

.page-about__hero-title {
  font-family: var(--font-about-heading);
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: 4px;
  line-height: 1.15;
  margin: 0 0 0.25rem 0;
  filter: drop-shadow(0 0 12px var(--color-about-accent-glow));
}

.page-about__hero-tagline {
  font-size: 0.9rem;
  color: var(--color-about-text-secondary);
  margin-bottom: 1rem;
  font-family: var(--font-about-mono);
  letter-spacing: 1px;
}

.page-about__hero-desc {
  font-family: var(--font-about-body);
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-about-text-secondary);
  margin-bottom: 1.5rem;
  max-width: 520px;
}

.page-about__hero-stats {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.page-about__stat-item {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  border-left: 2px solid var(--color-about-accent);
  padding-left: 0.6rem;
}

.page-about__stat-value {
  font-family: var(--font-about-mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-about-text);
  line-height: 1;
}

.page-about__stat-label {
  font-family: var(--font-about-mono);
  font-size: 0.65rem;
  letter-spacing: 1px;
  color: var(--color-about-text-secondary);
  text-transform: uppercase;
}

.page-about__hero-visual {
  flex: 1 1 280px;
  min-width: 0;
}

.page-about__hero-img {
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--color-about-border);
  box-shadow: 0 0 20px rgba(139,92,246,0.08);
  display: block;
}

/* ===== 数据可靠性 - 时间线 ===== */
.page-about__data-header {
  margin-bottom: 2rem;
}

.page-about__timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  padding-left: 1.5rem;
  border-left: 1px solid var(--color-about-line);
  margin-bottom: 2rem;
}

.page-about__timeline-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem 0;
  position: relative;
  cursor: default;
  transition: background var(--transition-fast);
  border-radius: 4px;
  margin-left: -1.5rem;
  padding-left: 1.5rem;
}

.page-about__timeline-item:hover {
  background: rgba(139,92,246,0.04);
}

.page-about__timeline-item:hover .page-about__timeline-dot {
  transform: scale(1.4);
  box-shadow: 0 0 12px var(--color-about-accent-glow);
}

.page-about__timeline-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-about-dot);
  border: 2px solid var(--color-about-bg-mid);
  flex-shrink: 0;
  margin-top: 4px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
  z-index: 2;
}

.page-about__timeline-content {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  flex: 1;
}

.page-about__timeline-label {
  font-family: var(--font-about-mono);
  font-size: 0.7rem;
  letter-spacing: 1.5px;
  color: var(--color-about-accent);
  text-transform: uppercase;
  font-weight: 700;
}

.page-about__timeline-text {
  font-family: var(--font-about-body);
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--color-about-text);
}

/* ===== 信任徽章 ===== */
.page-about__trust-badge {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: rgba(139,92,246,0.05);
  border: 1px solid var(--color-about-border);
  max-width: 640px;
  margin-top: 1rem;
}

.page-about__trust-icon {
  font-size: 1.2rem;
  color: var(--color-about-accent);
  flex-shrink: 0;
}

.page-about__trust-text {
  font-family: var(--font-about-body);
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--color-about-text-secondary);
}

/* ===== 分隔图片 ===== */
.page-about__divider {
  width: 100%;
  overflow: hidden;
  line-height: 0;
  background: var(--color-about-bg-start);
}

.page-about__divider-img {
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  display: block;
  opacity: 0.6;
}

/* ===== 联系区域 ===== */
.page-about__contact-grid {
  display: flex;
  gap: 2.5rem;
  align-items: flex-start;
  flex-wrap: wrap;
}

.page-about__contact-info {
  flex: 1 1 300px;
  min-width: 0;
}

.page-about__contact-card {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  background: var(--color-about-card-bg);
  border: 1px solid var(--color-about-border);
  margin-bottom: 0.75rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  cursor: default;
}

.page-about__contact-card:hover {
  border-color: var(--color-about-accent);
  box-shadow: 0 0 12px var(--color-about-accent-glow);
}

.page-about__contact-card[data-copy] {
  cursor: pointer;
}

.page-about__contact-card[data-copy]:hover .page-about__contact-hint {
  opacity: 1;
}

.page-about__contact-icon {
  font-size: 1.2rem;
  color: var(--color-about-accent);
  flex-shrink: 0;
  width: 2rem;
  text-align: center;
}

.page-about__contact-detail {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  flex: 1;
}

.page-about__contact-label {
  font-family: var(--font-about-mono);
  font-size: 0.6rem;
  letter-spacing: 1.5px;
  color: var(--color-about-text-secondary);
  text-transform: uppercase;
}

.page-about__contact-value {
  font-family: var(--font-about-mono);
  font-size: 0.95rem;
  color: var(--color-about-text);
  text-decoration: none;
  word-break: break-all;
}

a.page-about__contact-value:hover {
  color: var(--color-about-accent);
}

.page-about__contact-hint {
  font-family: var(--font-about-body);
  font-size: 0.65rem;
  color: var(--color-about-accent);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.page-about__contact-note {
  font-family: var(--font-about-body);
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--color-about-text-secondary);
  margin-top: 0.75rem;
  padding: 0.5rem 0.75rem;
  border-left: 2px solid var(--color-about-line);
  background: rgba(139,92,246,0.03);
}

.page-about__contact-visual {
  flex: 1 1 240px;
  min-width: 0;
}

.page-about__contact-img {
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--color-about-border);
  box-shadow: 0 0 20px rgba(139,92,246,0.06);
  display: block;
}

/* ===== 移动端优先：窄屏适配 ===== */
@media (max-width: 767px) {
  .page-about__container {
    padding: 0 0.75rem;
    flex-direction: column;
  }

  .page-about__indicator {
    display: none;
  }

  .page-about__panel {
    padding: 2rem 0 2rem 0;
  }

  .page-about__panel--hero {
    padding-top: 1rem;
  }

  .page-about__hero-content {
    flex-direction: column;
    gap: 1.25rem;
  }

  .page-about__hero-title {
    font-size: 1.7rem;
    letter-spacing: 2px;
  }

  .page-about__hero-tagline {
    font-size: 0.8rem;
  }

  .page-about__hero-desc {
    font-size: 0.85rem;
  }

  .page-about__hero-stats {
    gap: 1rem;
  }

  .page-about__stat-value {
    font-size: 1.3rem;
  }

  .page-about__hero-visual {
    flex-basis: auto;
    width: 100%;
  }

  .page-about__section-title {
    font-size: 1.3rem;
    letter-spacing: 2px;
  }

  .page-about__section-desc {
    font-size: 0.85rem;
  }

  .page-about__timeline {
    padding-left: 1rem;
    margin-left: 0;
  }

  .page-about__timeline-item {
    margin-left: -1rem;
    padding-left: 1rem;
  }

  .page-about__timeline-text {
    font-size: 0.8rem;
  }

  .page-about__trust-badge {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.4rem;
  }

  .page-about__divider {
    height: auto;
  }

  .page-about__contact-grid {
    flex-direction: column;
    gap: 1.5rem;
  }

  .page-about__contact-card {
    padding: 0.65rem 0.75rem;
  }

  .page-about__contact-value {
    font-size: 0.85rem;
  }

  .page-about__contact-visual {
    flex-basis: auto;
    width: 100%;
  }

  .page-about__breadcrumb {
    font-size: 0.65rem;
    flex-wrap: wrap;
  }
}

/* ===== 桌面端微调 ===== */
@media (min-width: 768px) {
  .page-about__panel {
    padding: 4rem 0 4rem 2.5rem;
  }

  .page-about__panel--hero {
    padding-top: 2rem;
  }

  .page-about__hero-title {
    font-size: 3rem;
  }

  .page-about__section-title {
    font-size: 2rem;
  }

  .page-about__hero-visual {
    max-width: 480px;
  }

  .page-about__contact-visual {
    max-width: 400px;
  }
}