body {
    font-family: 'Noto Sans JP', sans-serif;
    color: #333;
    background-color: #f5f5f5;
}

.header-container {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: #222;
    padding: 10px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 15px;
}

.nav-menu li a {
    color: #fff;
    text-decoration: none;
    padding: 10px 15px;
    font-weight: bold;
    transition: background 0.3s;
}

.nav-menu li a:hover {
    background-color: #00bcd4;
    border-radius: 4px;
}

.slider-container {
    position: relative;
    width: 100%;
    height: 400px;
    overflow: hidden;
}

.slide {
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
}