* {
  box-sizing: border-box;
}

/* 基础布局结构 */
body { 
  margin: 0; 
  padding: 0; 
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Microsoft YaHei", sans-serif; 
  background: #0f172a; 
  color: #e5e7eb; 
  min-height: 100vh;
  overflow-x: hidden;
}

/* SEO H1 视觉隐藏样式 */
.seo-h1 {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Skip to content link */
.skip-link {
  position: absolute;
  top: 0;
  left: 0;
  padding: 10px 20px;
  background: var(--primary-green, #10b981);
  color: white;
  z-index: 10000;
  text-decoration: none;
  border-radius: 0 0 8px 0;
  font-weight: 600;
  transform: translateY(-100%);
  transition: transform 0.2s;
}

.skip-link:focus {
  transform: translateY(0);
}