/* 淡入动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 上浮动画 */
@keyframes floatUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 缩放动画 */
@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* 应用动画的类 */
.fade-in {
    animation: fadeIn 0.3s ease-out;
}

.float-up {
    animation: floatUp 0.8s ease forwards;
}

.scale-in {
    animation: scaleIn 0.6s ease forwards;
}

/* 延迟动画类 */
.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }

/* 滚动显示动画 */
.scroll-reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
}

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

/* 基础动画 */
@keyframes slideIn {
    from { transform: translateX(-100%); }
    to { transform: translateX(0); }
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

/* 动画类 */
.slide-in {
    animation: slideIn 0.3s ease-out;
}

.pulse {
    animation: pulse 2s infinite;
}

/* 过渡效果 */
.transition-all {
    transition: all 0.3s ease;
}

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

.hover-lift:hover {
    transform: translateY(-2px);
}

/* 导航动画 */
.nav-toggle span {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-toggle.active span {
    background-color: var(--hover-color);
}

.nav-toggle.active span:nth-child(1) {
    transform: translateY(11px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
    transform: translateX(-10px);
}

.nav-toggle.active span:nth-child(3) {
    transform: translateY(-11px) rotate(-45deg);
}

/* 遮罩层动画 */
body.menu-open::after {
    transition: opacity 0.3s ease;
}

/* 卡片悬停动画 */
.article-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* 子菜单动画 */
.sub-menu a::before {
    transform-origin: bottom;
    transition: transform 0.3s ease;
}