基础样式 */
body {
    font-family: 'Inter', sans-serif;
    margin: 0;
    line-height: 1.6;
    color: #333;
}

header {
    display: flex;
    justify-content: space-between;
    padding: 1rem 5%;
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.hero {
    height: 80vh;
    background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), 
                url('hero-bg.jpg') center/cover;
    color: white;
    display: flex;
    align-items: center;
    text-align: center;
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    padding: 2rem 5%;
}

/* 响应式设计 */
@media (max-width: 768px) {
    nav ul { display: none; }
    .mobile-menu { display: block; }
}