/**
 * 滚动触发动画系统 CSS
 * 配合 GSAP ScrollTrigger 使用的动画类
 * 使用方法：为元素添加相应的CSS类名即可
 */

/* ===== 基础动画配置 ===== */
.scroll-animate {
    /* 确保动画平滑 */
    will-change: transform, opacity;
    /* 硬件加速 */
    transform: translateZ(0);
    backface-visibility: hidden;
    perspective: 1000px;
}

/* ===== Fade In Up 动画 ===== */
.fade-in-up {
    opacity: 0;
    transform: translateY(50px);
    transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.fade-in-up.animate-active {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Fade In Down 动画 ===== */
.fade-in-down {
    opacity: 0;
    transform: translateY(-50px);
    transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.fade-in-down.animate-active {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Fade In Left 动画 ===== */
.fade-in-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.fade-in-left.animate-active {
    opacity: 1;
    transform: translateX(0);
}

/* ===== Fade In Right 动画 ===== */
.fade-in-right {
    opacity: 0;
    transform: translateX(50px);
    transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.fade-in-right.animate-active {
    opacity: 1;
    transform: translateX(0);
}

/* ===== Scale In 动画 ===== */
.scale-in {
    opacity: 0;
    transform: scale(0.8);
    transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.scale-in.animate-active {
    opacity: 1;
    transform: scale(1);
}

/* ===== Rotate In 动画 ===== */
.rotate-in {
    opacity: 0;
    transform: rotate(-10deg) scale(0.9);
    transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.rotate-in.animate-active {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

/* ===== 组合动画 ===== */
.fade-scale-up {
    opacity: 0;
    transform: translateY(30px) scale(0.95);
    transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.fade-scale-up.animate-active {
    opacity: 1;
    transform: translateY(0) scale(1);
}

/* ===== 动画延迟类 ===== */
.animate-delay-100 { transition-delay: 0.1s; }
.animate-delay-200 { transition-delay: 0.2s; }
.animate-delay-300 { transition-delay: 0.3s; }
.animate-delay-400 { transition-delay: 0.4s; }
.animate-delay-500 { transition-delay: 0.5s; }
.animate-delay-600 { transition-delay: 0.6s; }
.animate-delay-700 { transition-delay: 0.7s; }
.animate-delay-800 { transition-delay: 0.8s; }

/* ===== 动画速度类 ===== */
.animate-fast {
    transition-duration: 0.4s !important;
}

.animate-slow {
    transition-duration: 1.2s !important;
}

.animate-slower {
    transition-duration: 1.6s !important;
}

/* ===== 动画缓动函数类 ===== */
.animate-ease-out {
    transition-timing-function: cubic-bezier(0.25, 0.46, 0.45, 0.94) !important;
}

.animate-ease-in-out {
    transition-timing-function: cubic-bezier(0.42, 0, 0.58, 1) !important;
}

.animate-bounce {
    transition-timing-function: cubic-bezier(0.68, -0.55, 0.265, 1.55) !important;
}

/* ===== 特殊效果 ===== */
.blur-in {
    opacity: 0;
    filter: blur(10px);
    transform: translateY(20px);
    transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.blur-in.animate-active {
    opacity: 1;
    filter: blur(0px);
    transform: translateY(0);
}

/* ===== 文字动画 ===== */
.text-reveal {
    opacity: 0;
    transform: translateY(100%);
    display: inline-block;
    transition: all 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.text-reveal.animate-active {
    opacity: 1;
    transform: translateY(0);
}

/* ===== 容器动画（用于包含多个子元素的情况） ===== */
.stagger-container .stagger-item {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.stagger-container.animate-active .stagger-item:nth-child(1) {
    transition-delay: 0.1s;
}

.stagger-container.animate-active .stagger-item:nth-child(2) {
    transition-delay: 0.2s;
}

.stagger-container.animate-active .stagger-item:nth-child(3) {
    transition-delay: 0.3s;
}

.stagger-container.animate-active .stagger-item:nth-child(4) {
    transition-delay: 0.4s;
}

.stagger-container.animate-active .stagger-item:nth-child(5) {
    transition-delay: 0.5s;
}

.stagger-container.animate-active .stagger-item {
    opacity: 1;
    transform: translateY(0);
}

/* ===== 响应式优化 ===== */
@media (max-width: 768px) {
    .fade-in-up,
    .fade-in-down,
    .fade-in-left,
    .fade-in-right,
    .scale-in,
    .rotate-in,
    .fade-scale-up,
    .blur-in {
        /* 移动端减少动画距离 */
        transform: translateY(20px);
        transition-duration: 0.6s;
    }
    
    .fade-in-left {
        transform: translateX(-20px);
    }
    
    .fade-in-right {
        transform: translateX(20px);
    }
}

/* ===== 减少动画偏好设置支持 ===== */
@media (prefers-reduced-motion: reduce) {
    .fade-in-up,
    .fade-in-down,
    .fade-in-left,
    .fade-in-right,
    .scale-in,
    .rotate-in,
    .fade-scale-up,
    .blur-in,
    .text-reveal,
    .stagger-item {
        transition-duration: 0.01ms !important;
        transition-delay: 0.01ms !important;
    }
}

/* ===== 调试模式 ===== */
.scroll-animate-debug {
    position: relative;
}

.scroll-animate-debug::before {
    content: 'ScrollTrigger Debug';
    position: absolute;
    top: -20px;
    left: 0;
    background: rgba(255, 0, 0, 0.8);
    color: white;
    padding: 2px 6px;
    font-size: 10px;
    z-index: 9999;
    pointer-events: none;
}