body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #f4f7f9;
    color: #333;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    width: 80%;
    max-width: 900px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    padding: 2rem;
}

header {
    text-align: center;
    border-bottom: 1px solid #e0e0e0;
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
}

h1 {
    color: #2c3e50;
    margin: 0;
}

p {
    color: #7f8c8d;
}

.editor-container {
    border: 1px solid #ccc;
    border-radius: 4px;
    overflow: hidden;
}

#rules-editor {
    width: 100%;
    height: 400px;
    border: none;
    padding: 1rem;
    font-family: "SF Mono", "Fira Code", "Courier New", monospace;
    font-size: 14px;
    line-height: 1.5;
    resize: vertical;
    box-sizing: border-box;
}

.actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 1.5rem;
}

button {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

#save-button {
    background-color: #3498db;
    color: white;
}

#save-button:hover {
    background-color: #2980b9;
}

#run-button {
    background-color: #2ecc71;
    color: white;
}

#run-button:hover {
    background-color: #27ae60;
}

#status-message {
    margin-top: 1rem;
    padding: 0.75rem;
    border-radius: 4px;
    text-align: center;
    font-weight: 500;
    display: none; /* Hidden by default */
}

#status-message.success {
    background-color: #e8f5e9;
    color: #2e7d32;
    display: block;
}

#status-message.error {
    background-color: #ffebee;
    color: #c62828;
    display: block;
}

footer {
    text-align: center;
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid #e0e0e0;
    color: #bdc3c7;
}