/* Aurora Background - 极光背景 */
/* 用法: 作为容器的背景，内容放在上面 */

.aurora {
  position: relative;
  overflow: hidden;
  background: #0a0a1a;
  border-radius: 20px;
}

.aurora__bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.aurora__blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.6;
  animation: aurora-float 8s ease-in-out infinite alternate;
}

.aurora__blob--1 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, #6366f1, transparent 70%);
  top: -100px;
  left: -100px;
  animation-delay: 0s;
}

.aurora__blob--2 {
  width: 350px;
  height: 350px;
  background: radial-gradient(circle, #10b981, transparent 70%);
  top: 50%;
  right: -80px;
  animation-delay: -3s;
  animation-duration: 10s;
}

.aurora__blob--3 {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, #ec4899, transparent 70%);
  bottom: -100px;
  left: 30%;
  animation-delay: -5s;
  animation-duration: 12s;
}

@keyframes aurora-float {
  0% {
    transform: translate(0, 0) scale(1);
  }
  33% {
    transform: translate(30px, -50px) scale(1.1);
  }
  66% {
    transform: translate(-20px, 20px) scale(0.9);
  }
  100% {
    transform: translate(10px, -30px) scale(1.05);
  }
}

/* 内容层 */
.aurora__content {
  position: relative;
  z-index: 1;
  padding: 3rem;
  color: #fff;
}

/* 变体 */
.aurora--blue .aurora__blob--1 { background: radial-gradient(circle, #3b82f6, transparent 70%); }
.aurora--blue .aurora__blob--2 { background: radial-gradient(circle, #6366f1, transparent 70%); }
.aurora--blue .aurora__blob--3 { background: radial-gradient(circle, #06b6d4, transparent 70%); }

.aurora--sunset .aurora__blob--1 { background: radial-gradient(circle, #f59e0b, transparent 70%); }
.aurora--sunset .aurora__blob--2 { background: radial-gradient(circle, #ef4444, transparent 70%); }
.aurora--sunset .aurora__blob--3 { background: radial-gradient(circle, #ec4899, transparent 70%); }

/* 网格叠加 */
.aurora__grid {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  z-index: 0;
}