*, *::before, *::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Helvetica Neue", Arial, sans-serif;
    background: whitesmoke;
    color: #333;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 20px;
}

h1 {
    font-size: 32px;
    margin-bottom: 8px;
}

.subtitle {
    color: #777;
    margin-bottom: 40px;
}

/* メーカー一覧 */
.maker-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.maker-card {
    background: #fff;
    padding: 24px;
    border-radius: 12px;
    text-align: center;
    font-weight: bold;
    text-decoration: none;
    color: #333;
    border-top: 4px solid #2563eb;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
    transition: 0.3s;
}

.maker-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 30px rgba(0,0,0,0.15);
}

/* お問い合わせセクション */
.contact-section {
    margin-top: 60px;
    background: #fff;
    padding: 36px 30px;
    border-radius: 12px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
    border-top: 4px solid #2563eb;
}

.contact-section h2 {
    font-size: 24px;
    margin-top: 0;
    margin-bottom: 24px;
    text-align: center;
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
}

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

.form-group label {
    display: block;
    font-weight: bold;
    font-size: 14px;
    margin-bottom: 8px;
    color: #444;
}

.required {
    background-color: #ef4444;
    color: #fff;
    font-size: 11px;
    padding: 2px 6px;
    border-radius: 4px;
    margin-left: 6px;
    vertical-align: middle;
}

.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form textarea {
    width: 100%;
    padding: 12px 14px;
    font-size: 15px;
    font-family: inherit;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    background-color: #f9fafb;
    transition: border-color 0.2s, box-shadow 0.2s, background-color 0.2s;
}

.contact-form input[type="text"]:focus,
.contact-form input[type="email"]:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: #2563eb;
    background-color: #fff;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.contact-form textarea {
    resize: vertical;
    min-height: 120px;
}

.submit-btn {
    display: block;
    width: 100%;
    max-width: 240px;
    margin: 30px auto 0;
    padding: 14px 20px;
    font-size: 16px;
    font-weight: bold;
    color: #fff;
    background-color: #2563eb;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
    transition: background-color 0.2s, transform 0.2s, box-shadow 0.2s;
}

.submit-btn:hover {
    background-color: #1d4ed8;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(37, 99, 235, 0.35);
}

.submit-btn:active {
    transform: translateY(0);
}

/* フッター */
.footer {
    margin-top: 80px;
    background: whitesmoke;
    border-top: 1px solid #e5e7eb;
}

.footer-inner {
    max-width: 900px;
    margin: 0 auto;
    padding: 24px 20px;
    text-align: center;
    color: #777;
    font-size: 14px;
}

/* レスポンシブ対応 */
@media (max-width: 600px) {
    .maker-list {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .contact-section {
        padding: 24px 16px;
    }

    .submit-btn {
        max-width: 100%;
    }
}