body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f6f8fa;
    margin: 0;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

.container {
    background: #ffffff;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    padding: 30px;
    width: 95%;
    max-width: 1400px;
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 25px;
}

h2 {
    color: #4a4a4a;
    font-size: 1.2em;
    border-bottom: 1px solid #eee;
    padding-bottom: 5px;
    margin-top: 0;
}

.editor-container {
    display: flex;
    gap: 20px;
}

.pane {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

#markdown-input {
    flex-grow: 1;
    min-height: 600px;
    padding: 15px;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 14px;
    resize: none;
    outline: none;
    transition: border-color 0.2s;
}

#markdown-input:focus {
    border-color: #0366d6;
    box-shadow: 0 0 0 3px rgba(3, 102, 214, 0.2);
}

#preview-output {
    flex-grow: 1;
    min-height: 600px;
    padding: 15px;
    border: 1px solid #ccc;
    border-radius: 5px;
    background-color: #fff;
    overflow-y: auto;
}

.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4 {
    border-bottom: none;
}

.markdown-body pre {
    background-color: #f6f8fa;
    padding: 10px;
    border-radius: 3px;
    overflow-x: auto;
}

.markdown-body code {
    background-color: rgba(27, 31, 35, 0.05);
    padding: 2px 4px;
    border-radius: 3px;
}

.license-footer {
    margin-top: 30px;
    font-size: 12px;
    color: #6a737d;
}

.license-footer a {
    color: #0366d6;
    text-decoration: none;
}

@media (max-width: 900px) {
    .editor-container {
        flex-direction: column;
    }
    
    .pane {
        width: 100%;
    }

    #markdown-input, #preview-output {
        min-height: 400px;
    }
}