body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: #f5f5f5;
}

/* iframe用のコンパクト表示 */
body.iframe-mode {
    max-width: 100%;
    margin: 0;
    padding: 10px;
    background-color: white;
}

.container {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

/* iframe用のコンテナスタイル */
body.iframe-mode .container {
    padding: 15px;
    border-radius: 5px;
    box-shadow: none;
    border: 1px solid #e0e0e0;
}

h1 {
    color: #333;
    text-align: center;
    margin-bottom: 30px;
}

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

label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: #555;
}

textarea, select {
    width: 100%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
    box-sizing: border-box;
}

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

button {
    background: #007bff;
    color: white;
    padding: 12px 30px;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    width: 100%;
    margin-top: 10px;
}

button:hover {
    background: #0056b3;
}

button:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.result {
    margin-top: 30px;
    padding: 20px;
    background: #e7f3ff;
    border: 1px solid #b3d9ff;
    border-radius: 5px;
    display: none;
}

.error {
    background: #ffe7e7;
    border: 1px solid #ffb3b3;
    color: #d00;
}

.loading {
    text-align: center;
    color: #666;
    font-style: italic;
}