/* 动画关键帧定义 */
@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes scaleIn {
    from {
        transform: scale(0.9);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

/* 滚动动画类 */
.animate-on-scroll {
    opacity: 1;
    transform: translateY(0);
    transition: all 0.6s ease-out;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 渐入动画 */
.fade-in {
    animation: fadeIn 0.5s ease-in-out forwards;
}

/* 向上滑入动画 */
.slide-up {
    animation: slideUp 0.5s ease-out forwards;
}

/* 缩放动画 */
.scale-in {
    animation: scaleIn 0.5s ease-out forwards;
}

/* 交互动画 */
.hover-lift {
    transition: transform 0.3s ease;
}

.hover-lift:hover {
    transform: translateY(-5px);
}

.hover-scale {
    transition: transform 0.3s ease;
}

.hover-scale:hover {
    transform: scale(1.05);
}

/* 导航栏滚动动画 */
.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

/* 按钮点击动画 */
.btn-pulse {
    position: relative;
    overflow: hidden;
}

.btn-pulse::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.3s ease-out, height 0.3s ease-out;
}

.btn-pulse:active::after {
    width: 200px;
    height: 200px;
}

/* 图片悬停效果 */
.img-zoom {
    overflow: hidden;
}

.img-zoom img {
    transition: transform 0.3s ease;
}

.img-zoom:hover img {
    transform: scale(1.1);
}

/* 文字渐变动画 */
.text-gradient {
    background: linear-gradient(45deg, #0066cc, #00cc99);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-size: 200% 200%;
    animation: gradient 3s ease infinite;
}

@keyframes gradient {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 30px;
    height: 30px;
    border: 3px solid rgba(0, 102, 204, 0.3);
    border-radius: 50%;
    border-top-color: #0066cc;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* 滚动提示动画 */
.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 50px;
    border: 2px solid white;
    border-radius: 15px;
}

.scroll-indicator::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    width: 4px;
    height: 8px;
    background: white;
    border-radius: 2px;
    transform: translateX(-50%);
    animation: scrollIndicator 2s infinite;
}

@keyframes scrollIndicator {
    0% {
        opacity: 1;
        transform: translate(-50%, 0);
    }
    100% {
        opacity: 0;
        transform: translate(-50%, 20px);
    }
}