/* 基础样式 */
body, html {
    margin: 0;
    padding: 0;
    font-family: 'Arial', sans-serif;
    scroll-behavior: smooth;
}

nav {
    position: fixed;
    width: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 1000;
}

nav ul {
    list-style: none;
    margin: 0;
    padding: 10px;
    display: flex;
    justify-content: center;
}

nav ul li {
    margin: 0 15px;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-size: 18px;
}

.section {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 20px;
}

#home {
    background: url('images/home-bg.jpg') no-repeat center center/cover;
    color: white;
    position: relative;
}

.overlay {
    background: rgba(0, 0, 0, 0.5);
    padding: 50px;
    border-radius: 10px;
}

#about {
    background-color: #f4f4f4;
}

#portfolio {
    background-color: #333;
    color: white;
}

.gallery {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
}

.gallery-item {
    background-color: #444;
    padding: 20px;
    margin: 10px;
    width: calc(50% - 40px);
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
    transition: transform 0.3s ease-in-out;
}

.gallery-item:hover {
    transform: scale(1.1);
}

#contact {
    background-color: #f4f4f4;
}

button {
    padding: 10px 20px;
    background-color: #007BFF;
    border: none;
    color: white;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #0056b3;
}