/* 自定义样式补充 */
.hero {
    background-image: url('https://picsum.photos/1200/600?grayscale');
    background-size: cover;
    background-position: center;
    background-blend-mode: overlay;
}

.mobile-menu {
    display: none;
}

.mobile-menu.active {
    display: block;
}

/* 动画效果 */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.features div {
    animation: fadeIn 0.5s ease-out forwards;
}

.features div:nth-child(1) { animation-delay: 0.1s; }
.features div:nth-child(2) { animation-delay: 0.3s; }
.features div:nth-child(3) { animation-delay: 0.5s; }

/* 响应式调整 */
@media (max-width: 768px) {
    .hero {
        padding: 4rem 2rem;
        text-align: center;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero p {
        font-size: 1.2rem;
    }
}