.blog-background {
  position: fixed;
  inset: 0;
  z-index: -1;
  background: var(--sp-color-background);
}

.blog-background::before {
  content: '';
  position: fixed;
  top: -150px;
  right: -150px;
  width: 600px;
  height: 600px;
  border-radius: var(--sp-radius-full);
  background: radial-gradient(
    circle,
    rgba(var(--sp-color-primary-rgb), 0.25) 0%,
    rgba(var(--sp-color-primary-rgb), 0.15) 35%,
    rgba(var(--sp-color-primary-rgb), 0.05) 70%,
    transparent 100%
  );
  animation: pulse-soft 8s cubic-bezier(0.4, 0, 0.6, 1) infinite;
  pointer-events: none;
}

.blog-background::after {
  content: '';
  position: fixed;
  bottom: -200px;
  right: -200px;
  width: 500px;
  height: 500px;
  border-radius: var(--sp-radius-full);
  background: radial-gradient(
    circle,
    rgba(var(--sp-color-primary-rgb), 0.22) 0%,
    rgba(var(--sp-color-primary-rgb), 0.12) 40%,
    rgba(var(--sp-color-primary-rgb), 0.04) 70%,
    transparent 100%
  );
  animation: pulse-soft 8s cubic-bezier(0.4, 0, 0.6, 1) infinite 2s;
  pointer-events: none;
}

.blog-shape-left {
  position: fixed;
  left: -150px;
  top: 50%;
  transform: translateY(-50%);
  width: 300px;
  height: 300px;
  border-radius: var(--sp-radius-full);
  background: radial-gradient(
    circle,
    rgba(var(--sp-color-primary-rgb), 0.40) 0%,
    rgba(var(--sp-color-primary-rgb), 0.22) 30%,
    rgba(var(--sp-color-primary-rgb), 0.08) 60%,
    transparent 100%
  );
  animation: pulse-soft 8s cubic-bezier(0.4, 0, 0.6, 1) infinite 4s;
  pointer-events: none;
  z-index: -1;
}

@keyframes pulse-soft {
  0%, 100% { opacity: 0.9; transform: translateY(-50%) scale(1); }
  50% { opacity: 0.7; transform: translateY(-50%) scale(1.05); }
}