/* Aurora Background Effect */
.aurora-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    background: transparent;
    pointer-events: none;
}

.aurora-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.8;
}

.aurora-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse 80% 60% at 30% 40%, rgba(147, 51, 234, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse 70% 80% at 70% 60%, rgba(59, 130, 246, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse 60% 70% at 50% 80%, rgba(16, 185, 129, 0.1) 0%, transparent 50%);
    mix-blend-mode: screen;
    animation: aurora-overlay 40s infinite ease-in-out;
}

@keyframes aurora-overlay {

    0%,
    100% {
        opacity: 0.3;
        transform: scale(1) rotate(0deg);
    }

    50% {
        opacity: 0.6;
        transform: scale(1.1) rotate(180deg);
    }
}

.aurora-item {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    animation: aurora-move 20s infinite linear;
    mix-blend-mode: screen;
    opacity: 0.8;
}

.aurora-item:nth-child(1) {
    width: 450px;
    height: 450px;
    background: radial-gradient(ellipse 60% 80%, rgba(147, 51, 234, 0.4) 0%, rgba(147, 51, 234, 0.2) 40%, rgba(147, 51, 234, 0.08) 70%, transparent 100%);
    top: 5%;
    left: 5%;
    animation-duration: 25s;
    animation-delay: 0s;
}

.aurora-item:nth-child(2) {
    width: 500px;
    height: 500px;
    background: radial-gradient(ellipse 70% 90%, rgba(59, 130, 246, 0.35) 0%, rgba(59, 130, 246, 0.18) 40%, rgba(59, 130, 246, 0.06) 70%, transparent 100%);
    top: 15%;
    right: 10%;
    animation-duration: 30s;
    animation-delay: -5s;
}

.aurora-item:nth-child(3) {
    width: 380px;
    height: 380px;
    background: radial-gradient(ellipse 80% 60%, rgba(16, 185, 129, 0.4) 0%, rgba(16, 185, 129, 0.2) 40%, rgba(16, 185, 129, 0.08) 70%, transparent 100%);
    bottom: 25%;
    left: 15%;
    animation-duration: 35s;
    animation-delay: -10s;
}

.aurora-item:nth-child(4) {
    width: 420px;
    height: 420px;
    background: radial-gradient(ellipse 65% 85%, rgba(236, 72, 153, 0.35) 0%, rgba(236, 72, 153, 0.18) 40%, rgba(236, 72, 153, 0.06) 70%, transparent 100%);
    bottom: 15%;
    right: 20%;
    animation-duration: 28s;
    animation-delay: -15s;
}

.aurora-item:nth-child(5) {
    width: 350px;
    height: 350px;
    background: radial-gradient(ellipse 75% 70%, rgba(251, 191, 36, 0.4) 0%, rgba(251, 191, 36, 0.2) 40%, rgba(251, 191, 36, 0.08) 70%, transparent 100%);
    top: 45%;
    left: 45%;
    animation-duration: 22s;
    animation-delay: -8s;
}

.aurora-item:nth-child(6) {
    width: 480px;
    height: 480px;
    background: radial-gradient(ellipse 55% 95%, rgba(139, 92, 246, 0.35) 0%, rgba(139, 92, 246, 0.18) 40%, rgba(139, 92, 246, 0.06) 70%, transparent 100%);
    top: 55%;
    right: 35%;
    animation-duration: 32s;
    animation-delay: -12s;
}

@keyframes aurora-move {
    0% {
        transform: translate(0, 0) rotate(0deg) scale(1);
    }

    20% {
        transform: translate(80px, -30px) rotate(72deg) scale(1.15);
    }

    40% {
        transform: translate(-40px, 80px) rotate(144deg) scale(0.85);
    }

    60% {
        transform: translate(-80px, -60px) rotate(216deg) scale(1.1);
    }

    80% {
        transform: translate(60px, 40px) rotate(288deg) scale(0.9);
    }

    100% {
        transform: translate(0, 0) rotate(360deg) scale(1);
    }
}

/* 响应式调整 */
@media (max-width: 768px) {
    .aurora-item {
        filter: blur(40px);
    }

    .aurora-item:nth-child(1) {
        width: 280px;
        height: 280px;
    }

    .aurora-item:nth-child(2) {
        width: 320px;
        height: 320px;
    }

    .aurora-item:nth-child(3) {
        width: 250px;
        height: 250px;
    }

    .aurora-item:nth-child(4) {
        width: 290px;
        height: 290px;
    }

    .aurora-item:nth-child(5) {
        width: 220px;
        height: 220px;
    }

    .aurora-item:nth-child(6) {
        width: 300px;
        height: 300px;
    }

    .aurora-container::before {
        opacity: 0.8;
    }
}

/* Aurora背景作为覆盖层，不替换原有背景 */
.aurora-background {
    background: transparent;
}

/* 暗色主题适配 */
[data-theme="dark"] .aurora-background {
    background: transparent;
}

[data-theme="dark"] .aurora-container {
    opacity: 0.8;
}

/* 亮色主题适配 */
[data-theme="light"] .aurora-background {
    background: transparent;
}

[data-theme="light"] .aurora-container {
    opacity: 0.6;
}

[data-theme="light"] .aurora-item {
    opacity: 0.8;
    mix-blend-mode: multiply;
}

[data-theme="light"] .aurora-item:nth-child(1) {
    background: radial-gradient(ellipse 60% 80%, rgba(147, 51, 234, 0.25) 0%, rgba(147, 51, 234, 0.12) 40%, rgba(147, 51, 234, 0.05) 70%, transparent 100%);
}

[data-theme="light"] .aurora-item:nth-child(2) {
    background: radial-gradient(ellipse 70% 90%, rgba(59, 130, 246, 0.22) 0%, rgba(59, 130, 246, 0.10) 40%, rgba(59, 130, 246, 0.04) 70%, transparent 100%);
}

[data-theme="light"] .aurora-item:nth-child(3) {
    background: radial-gradient(ellipse 80% 60%, rgba(16, 185, 129, 0.25) 0%, rgba(16, 185, 129, 0.12) 40%, rgba(16, 185, 129, 0.05) 70%, transparent 100%);
}

[data-theme="light"] .aurora-item:nth-child(4) {
    background: radial-gradient(ellipse 65% 85%, rgba(236, 72, 153, 0.22) 0%, rgba(236, 72, 153, 0.10) 40%, rgba(236, 72, 153, 0.04) 70%, transparent 100%);
}

[data-theme="light"] .aurora-item:nth-child(5) {
    background: radial-gradient(ellipse 75% 70%, rgba(251, 191, 36, 0.25) 0%, rgba(251, 191, 36, 0.12) 40%, rgba(251, 191, 36, 0.05) 70%, transparent 100%);
}

[data-theme="light"] .aurora-item:nth-child(6) {
    background: radial-gradient(ellipse 55% 95%, rgba(139, 92, 246, 0.22) 0%, rgba(139, 92, 246, 0.10) 40%, rgba(139, 92, 246, 0.04) 70%, transparent 100%);
}

[data-theme="light"] .aurora-container::before {
    background: radial-gradient(ellipse 80% 60% at 30% 40%, rgba(147, 51, 234, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse 70% 80% at 70% 60%, rgba(59, 130, 246, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse 60% 70% at 50% 80%, rgba(16, 185, 129, 0.08) 0%, transparent 50%);
}

/* Split Text Animation */
.split-text {
  overflow: hidden;
  position: relative;
}

.split-text .char {
  display: inline-block;
  opacity: 0;
  transform: translateY(40px);
  transition: all 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  will-change: transform, opacity;
}

.split-text .char.animate {
  opacity: 1;
  transform: translateY(0);
}

/* 为空格添加特殊处理 */
.split-text .char.space {
  width: 0.3em;
}

/* 动画延迟变量 */
.split-text .char:nth-child(1) { transition-delay: 0ms; }
.split-text .char:nth-child(2) { transition-delay: 100ms; }
.split-text .char:nth-child(3) { transition-delay: 200ms; }
.split-text .char:nth-child(4) { transition-delay: 300ms; }
.split-text .char:nth-child(5) { transition-delay: 400ms; }
.split-text .char:nth-child(6) { transition-delay: 500ms; }
.split-text .char:nth-child(7) { transition-delay: 600ms; }
.split-text .char:nth-child(8) { transition-delay: 700ms; }
.split-text .char:nth-child(9) { transition-delay: 800ms; }
.split-text .char:nth-child(10) { transition-delay: 900ms; }
.split-text .char:nth-child(11) { transition-delay: 1000ms; }
.split-text .char:nth-child(12) { transition-delay: 1100ms; }
.split-text .char:nth-child(13) { transition-delay: 1200ms; }
.split-text .char:nth-child(14) { transition-delay: 1300ms; }
.split-text .char:nth-child(15) { transition-delay: 1400ms; }
.split-text .char:nth-child(16) { transition-delay: 1500ms; }
.split-text .char:nth-child(17) { transition-delay: 1600ms; }
.split-text .char:nth-child(18) { transition-delay: 1700ms; }
.split-text .char:nth-child(19) { transition-delay: 1800ms; }
.split-text .char:nth-child(20) { transition-delay: 1900ms; }
.split-text .char:nth-child(21) { transition-delay: 2000ms; }
.split-text .char:nth-child(22) { transition-delay: 2100ms; }
.split-text .char:nth-child(23) { transition-delay: 2200ms; }
.split-text .char:nth-child(24) { transition-delay: 2300ms; }
.split-text .char:nth-child(25) { transition-delay: 2400ms; }
.split-text .char:nth-child(26) { transition-delay: 2500ms; }
.split-text .char:nth-child(27) { transition-delay: 2600ms; }
.split-text .char:nth-child(28) { transition-delay: 2700ms; }
.split-text .char:nth-child(29) { transition-delay: 2800ms; }
.split-text .char:nth-child(30) { transition-delay: 2900ms; }

/* 响应式调整 */
@media (max-width: 768px) {
  .split-text .char {
    transform: translateY(30px);
  }
}

/* 减少动画偏好支持 */
@media (prefers-reduced-motion: reduce) {
  .split-text .char {
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}