* {
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

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

header h1 {
    margin: 0;
    font-size: 2rem;
}

nav {
    background-color: #444;
    padding: 0;
}

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

nav li {
    margin: 0;
}

nav a {
    display: block;
    color: white;
    text-decoration: none;
    padding: 15px 20px;
    transition: background-color 0.3s;
}

nav a:hover {
    background-color: #555;
}

main {
    background-color: white;
    margin: 20px auto;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

section {
    max-width: 900px;
    margin: 0 auto;
}

section h2 {
    font-size: 1.8rem;
    color: #333;
}

footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 20px 0;
    margin-top: 40px;
}

footer p {
    margin: 0;
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.5rem;
    }

    nav ul {
        flex-direction: column;
    }

    nav a {
        padding: 12px 15px;
    }

    main {
        margin: 10px 0;
        padding: 15px;
    }

    section h2 {
        font-size: 1.4rem;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.2rem;
    }

    nav a {
        padding: 10px 12px;
        font-size: 0.9rem;
    }

    main {
        padding: 10px;
    }

    section h2 {
        font-size: 1.1rem;
    }
}

/* お問い合わせページのスタイル */
.contact-info {
    background-color: #f9f9f9;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
    border-left: 4px solid #333;
}

.contact-info h3 {
    margin-top: 0;
    color: #333;
}

.info-item {
    margin-bottom: 15px;
}

.info-item h4 {
    margin: 0 0 5px 0;
    color: #555;
    font-size: 0.95rem;
}

.info-item p {
    margin: 0;
    color: #333;
}

.info-item a {
    color: #0066cc;
    text-decoration: none;
}

.info-item a:hover {
    text-decoration: underline;
}

.contact-form {
    background-color: #fff;
}

.contact-form h3 {
    color: #333;
    margin-top: 0;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #333;
    font-weight: bold;
}

.form-group .required {
    color: #e74c3c;
    margin-left: 3px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-family: Arial, sans-serif;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #0066cc;
    box-shadow: 0 0 5px rgba(0, 102, 204, 0.3);
}

.submit-btn {
    background-color: #333;
    color: white;
    padding: 12px 30px;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s;
}

.submit-btn:hover {
    background-color: #555;
}

.submit-btn:active {
    background-color: #222;
}

/* レスポンシブ対応（お問い合わせページ） */
@media (max-width: 768px) {
    .contact-info {
        padding: 15px;
    }

    .form-group input,
    .form-group textarea {
        font-size: 16px;
    }
}