// 页面加载完成后执行
document.addEventListener('DOMContentLoaded', function() {
    // 添加卡片点击效果
    addCardClickEffects();
    
    // 添加滚动动画
    addScrollAnimations();
    
    // 添加触摸反馈
    addTouchFeedback();
});

// 添加卡片点击效果
function addCardClickEffects() {
    const cards = document.querySelectorAll('.card');
    
    cards.forEach((card, index) => {
        // 鼠标悬停效果
        card.addEventListener('mouseenter', function() {
            this.style.transform = 'translateY(-4px) scale(1.02)';
        });
        
        card.addEventListener('mouseleave', function() {
            this.style.transform = 'translateY(0) scale(1)';
        });
    });
}



// 添加滚动动画
function addScrollAnimations() {
    const cards = document.querySelectorAll('.card');
    
    const observer = new IntersectionObserver((entries) => {
        entries.forEach((entry, index) => {
            if (entry.isIntersecting) {
                entry.target.style.opacity = '0';
                entry.target.style.transform = 'translateY(30px)';
                
                setTimeout(() => {
                    entry.target.style.transition = 'all 0.6s ease';
                    entry.target.style.opacity = '1';
                    entry.target.style.transform = 'translateY(0)';
                }, index * 100);
            }
        });
    }, {
        threshold: 0.1,
        rootMargin: '0px 0px -50px 0px'
    });
    
    cards.forEach(card => {
        observer.observe(card);
    });
}

// 添加触摸反馈
function addTouchFeedback() {
    const cards = document.querySelectorAll('.card');
    
    cards.forEach(card => {
        card.addEventListener('touchstart', function() {
            this.style.transform = 'scale(0.98)';
        });
        
        card.addEventListener('touchend', function() {
            this.style.transform = 'scale(1)';
        });
    });
}

// 添加CSS动画样式
const style = document.createElement('style');
style.textContent = `
    @keyframes ripple {
        to {
            transform: scale(4);
            opacity: 0;
        }
    }
    
    .card {
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    
    .card:active {
        transform: scale(0.98) !important;
    }
`;

document.head.appendChild(style);

// 添加页面加载动画
window.addEventListener('load', function() {
    document.body.style.opacity = '0';
    document.body.style.transition = 'opacity 0.5s ease';
    
    setTimeout(() => {
        document.body.style.opacity = '1';
    }, 100);
});

// 添加键盘导航支持
document.addEventListener('keydown', function(e) {
    const cards = document.querySelectorAll('.card');
    const currentIndex = Array.from(cards).findIndex(card => 
        card === document.activeElement || card.contains(document.activeElement)
    );
    
    let nextIndex = currentIndex;
    
    switch(e.key) {
        case 'ArrowDown':
            e.preventDefault();
            nextIndex = Math.min(currentIndex + 1, cards.length - 1);
            break;
        case 'ArrowUp':
            e.preventDefault();
            nextIndex = Math.max(currentIndex - 1, 0);
            break;
        case 'Enter':
        case ' ':
            e.preventDefault();
            if (currentIndex >= 0) {
                cards[currentIndex].click();
            }
            break;
    }
    
    if (nextIndex !== currentIndex && nextIndex >= 0) {
        cards[nextIndex].focus();
    }
});

// 为卡片添加焦点样式
document.querySelectorAll('.card').forEach(card => {
    card.setAttribute('tabindex', '0');
});