body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f4f4f9;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
}

.editor-container {
    background-color: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    max-width: 1010px;
    display: flex;
    flex-direction: column;
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 20px;
}

#editor {
    width: 950px;
    height: 400px;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
    line-height: 1.6;
    resize: vertical;
    box-sizing: border-box;
}

#editor:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 5px rgba(0, 123, 255, 0.5);
}

.file-name-input-group {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    margin-top: 20px;
    gap: 10px;
}

.file-name-input-group label {
    font-size: 16px;
    color: #555;
}

#fileNameInput {
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
    width: 200px;
}

.button-group {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 10px;
}

.button-group button {
    padding: 12px 25px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.2s;
}

#loadButton {
    background-color: #6c757d;
    color: white;
}

#loadButton:hover {
    background-color: #5a6268;
}

#saveAsButton {
    background-color: #007bff;
    color: white;
}

#saveAsButton:hover {
    background-color: #0056b3;
}

/* 新しいボタンのスタイル */
#pauseButton {
    background-color: #ffc107;
    color: #333;
}

#pauseButton:hover {
    background-color: #e0a800;
}

#resumeButton {
    background-color: #28a745;
    color: white;
}

#resumeButton:hover:not(:disabled) {
    background-color: #218838;
}

#resumeButton:disabled {
    background-color: #a0a0a0;
    cursor: not-allowed;
}

#messageArea {
    text-align: right;
    margin-top: 10px;
    font-size: 14px;
    color: #6c757d;
    opacity: 1;
    transition: opacity 0.5s ease-in-out;
}

.message-hidden {
    opacity: 0;
}

.return-top-group {
    margin-top: 20px;
    text-align: center;
}

.return-button {
    display: inline-block;
    padding: 10px 20px;
    background-color: #4CAF50;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    font-size: 16px;
    transition: background-color 0.2s;
}

.return-button:hover {
    background-color: #45a049;
}