* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
    line-height: 1.6;
    background: #1a1a1a;
    color: #e0e0e0;
}

.container {
    background: #2b2b2b;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.5);
}

h1 {
    margin-top: 0;
    color: #f0f0f0;
}

input[type="text"] {
    padding: 12px;
    font-size: 16px;
    border: 1px solid #404040;
    border-radius: 4px;
    background: #1a1a1a;
    color: #e0e0e0;
}

input[type="text"]:focus {
    outline: none;
    border-color: #5eb3d6;
}

button, .save-button {
    padding: 10px 24px;
    background: #5eb3d6;
    color: #1a1a1a;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.2s;
    font-weight: 500;
}

button:hover, .save-button:hover {
    background: #7ec9e6;
}

.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    border-bottom: 2px solid #404040;
}

.tabs .spacer {
    flex: 1;
}

.tab-button {
    padding: 10px 20px;
    border: none;
    background: none;
    cursor: pointer;
    font-size: 16px;
    color: #a0a0a0;
    border-bottom: 3px solid transparent;
    transition: all 0.2s;
}

.tab-button:hover {
    color: #e0e0e0;
    background: #333;
}

.tab-button.active {
    color: #5eb3d6;
    border-bottom-color: #5eb3d6;
}

#preview {
    min-height: 200px;
    padding: 20px;
    border: 1px solid #404040;
    border-radius: 4px;
    background: #1f1f1f;
    color: #e0e0e0;
}

#preview h1, #preview h2, #preview h3 {
    margin-top: 24px;
    margin-bottom: 12px;
    color: #f0f0f0;
}

#preview h1:first-child,
#preview h2:first-child,
#preview h3:first-child {
    margin-top: 0;
}

#preview ul, #preview ol {
    padding-left: 24px;
}

#preview input[type="checkbox"] {
    margin-right: 8px;
    cursor: pointer;
}

#preview a {
    color: #5eb3d6;
}

#preview a:hover {
    color: #7ec9e6;
}

#preview code {
    background: #333;
    padding: 2px 6px;
    border-radius: 3px;
    font-family: monospace;
    font-size: 0.9em;
    color: #e0e0e0;
}

#preview pre {
    background: #1a1a1a;
    padding: 12px;
    border-radius: 4px;
    overflow-x: auto;
    border: 1px solid #404040;
}

#preview pre code {
    background: none;
    padding: 0;
}

#editor-wrap {
    display: none;
}

#editor {
    width: 100%;
    min-height: 400px;
    padding: 12px;
    font-family: monospace;
    font-size: 14px;
    border: 1px solid #404040;
    border-radius: 4px;
    resize: none;
    background: #1a1a1a;
    color: #e0e0e0;
}

.save-button {
    margin-top: 10px;
}