body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #f5f5f5;
    height: 100vh;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
}

.container {
    display: flex;
    flex-direction: column;
    height: 100%;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

h1 {
    margin-top: 0;
    margin-bottom: 20px;
    font-size: 24px;
    color: #333;
}

.controls {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 20px;
    background: white;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

select {
    padding: 8px 12px;
    font-size: 14px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background-color: white;
}

.timezone-selector {
    display: flex;
    gap: 15px;
}

.timezone-selector label {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-size: 14px;
    color: #555;
}

.editor-pane {
    display: flex;
    gap: 20px;
    flex: 1;
    min-height: 0; /* Important for nested flex scrolling */
}

textarea {
    flex: 1;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    resize: none;
    font-family: "SF Mono", "Monaco", "Inconsolata", "Fira Mono", "Droid Sans Mono", "Source Code Pro", monospace;
    font-size: 13px;
    line-height: 1.5;
    white-space: pre;
    overflow-y: auto;
    background-color: white;
}

textarea:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 2px rgba(0,123,255,0.1);
}

#output {
    background-color: #f8f9fa;
    color: #333;
}