body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #000;
    color: #fff;
}

.container {
    width: 90%;
    margin: 0 auto;
    padding: 0 10px;
}

header {
    background-color: #333;
    color: #fff;
    padding: 10px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    height: 70px; /* ヘッダーの高さを固定 */
}

header .logo {
    height: 50px;
    width: auto;
}

header .menu-toggle {
    display: none;
    font-size: 24px;
    cursor: pointer;
}

header nav ul {
    list-style: none;
    display: flex;
    margin: 0;
    padding: 0;
    width: 100%;
    justify-content: space-around;
}

header nav ul li {
    margin: 0 10px;
    flex-grow: 1;
    text-align: center;
}

header nav ul li a {
    color: #fff;
    text-decoration: none;
    white-space: nowrap;
    display: block;
}

main {
    padding: 80px 0 20px 0; /* ヘッダーの固定分の余白を確保 */
    background-color: #000;
}

section {
    padding: 60px 0;
}

.feature-item, .service-item, .details-item, .art-item, .process-steps .step, .faq-item {
    background-color: #333;
    border-radius: 10px;
    padding: 20px;
    margin: 20px 0;
    display: flex;
    flex-direction: column; /* モバイル表示で要素を縦並びに */
    align-items: center;
    border: 1px solid #555;
}

.feature-item .icon, .service-item .icon, .details-item .icon, .art-item .icon, .process-steps .step .icon, .faq-item .icon {
    margin-bottom: 10px; /* アイコンとテキストの間に余白を追加 */
    font-size: 24px;
}

.welcome-section {
    background: url('path_to_your_banner_image.png') no-repeat center center;
    background-size: cover;
    color: #fff;
    text-align: center;
    position: relative;
    padding: 100px 0;
    height: 100vh; /* 高さを画面全体に設定 */
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.welcome-section::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 0;
}

.welcome-section h1, .welcome-section p {
    position: relative;
    z-index: 1;
}

.banner-image {
    max-width: 80%; /* バナー画像の最大幅を調整 */
    height: auto;
    margin-top: 20px; /* バナー画像の上部に余白を追加 */
}

footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 20px 0;
}

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

footer ul li {
    margin: 0 10px;
}

footer ul li a {
    color: #fff;
    text-decoration: none;
}

form {
    display: flex;
    flex-direction: column;
}

form label {
    margin: 10px 0 5px;
}

form input, form textarea {
    padding: 10px;
    margin-bottom: 20px;
    border: 1px solid #ccc;
    border-radius: 5px;
}

form button {
    padding: 10px 20px;
    border: none;
    background-color: #007bff;
    color: #fff;
    cursor: pointer;
    border-radius: 5px;
}

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

@media (max-width: 768px) {
    header {
        flex-direction: column;
        align-items: flex-start;
        padding: 10px;
        height: auto; /* モバイル表示では高さを自動調整 */
    }

    header .logo {
        height: 50px;
    }

    header .menu-toggle {
        display: block;
    }

    header nav {
        display: none;
        width: 100%;
    }

    header nav ul {
        flex-direction: column;
        width: 100%;
    }

    header nav ul li {
        margin: 10px 0;
    }

    main {
        padding: 100px 0 20px 0;
    }

    section {
        padding: 40px 0;
    }

    .container {
        width: 100%;
        padding: 0 10px; /* モバイルでも左右の余白を追加 */
    }

    .welcome-section {
        height: 80vh; /* モバイルでは少し高さを調整 */
    }

    .banner-image {
        max-width: 90%; /* モバイルでは最大幅を少し広げる */
    }
}