.vendor-auth-wrapper {
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.auth-message {
    padding: 1rem;
    margin-bottom: 2rem;
    border-radius: 4px;
}

.auth-message.success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.auth-message.error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.auth-tabs {
    display: flex;
    margin-bottom: 2rem;
    border-bottom: 1px solid #ddd;
}

.tab-button {
    background: none;
    border: none;
    padding: 1rem 2rem;
    cursor: pointer;
    font-size: 1rem;
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
}

.tab-button:hover {
    background-color: #f8f9fa;
}

.tab-button.active {
    border-bottom-color: #007cba;
    color: #007cba;
    font-weight: 600;
}

.auth-form {
    display: none;
    animation: fadeIn 0.3s ease-in;
}

.auth-form.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.form-section {
    border: 1px solid #ddd;
    padding: 1.5rem;
    margin-bottom: 2rem;
    border-radius: 8px;
    background-color: #fafafa;
}

.form-section legend {
    font-weight: bold;
    padding: 0 0.5rem;
    color: #333;
    font-size: 1.1rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #333;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    box-sizing: border-box;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #007cba;
    box-shadow: 0 0 0 2px rgba(0, 124, 186, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-group input[type="checkbox"] {
    width: auto;
    margin-right: 0.5rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: #007cba;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    text-decoration: none;
    transition: background-color 0.3s ease, transform 0.1s ease;
    font-weight: 500;
}

.btn:hover {
    background-color: #005a87;
    transform: translateY(-1px);
}

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

.btn-primary {
    background-color: #007cba;
}

.btn:disabled {
    background-color: #ccc;
    cursor: not-allowed;
    transform: none;
}

/* フォームバリデーション */
.form-group input:invalid,
.form-group select:invalid,
.form-group textarea:invalid {
    border-color: #dc3545;
}

.form-group input:valid,
.form-group select:valid,
.form-group textarea:valid {
    border-color: #28a745;
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    .vendor-auth-wrapper {
        padding: 0 0.5rem;
        margin: 1rem auto;
    }
    
    .form-section {
        padding: 1rem;
        margin-bottom: 1.5rem;
    }
    
    .tab-button {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
    }
    
    .auth-tabs {
        margin-bottom: 1.5rem;
    }
    
    .form-group input,
    .form-group select,
    .form-group textarea {
        padding: 0.6rem;
    }
}

@media (max-width: 480px) {
    .vendor-auth-wrapper {
        margin: 0.5rem auto;
    }
    
    .auth-tabs {
        flex-direction: column;
        border-bottom: none;
    }
    
    .tab-button {
        border-bottom: 1px solid #ddd;
        border-radius: 4px;
        margin-bottom: 0.5rem;
    }
    
    .tab-button.active {
        border-color: #007cba;
        background-color: #007cba;
        color: white;
    }
    
    .form-section {
        padding: 0.75rem;
    }
    
    .form-section legend {
        font-size: 1rem;
    }
}