* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-color: #f5f5f5;
    --container-bg: white;
    --toolbar-bg: #f8f9fa;
    --border-color: #dee2e6;
    --text-color: #333;
    --status-text-color: #6c757d;
    --button-hover: #e9ecef;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --container-bg: #2d2d2d;
    --toolbar-bg: #363636;
    --border-color: #404040;
    --text-color: #e0e0e0;
    --status-text-color: #b0b0b0;
    --button-hover: #404040;
    --shadow-color: rgba(0, 0, 0, 0.3);
}

body {
    font-family: Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 1200px;
    margin: 20px auto;
    background-color: var(--container-bg);
    box-shadow: 0 0 10px var(--shadow-color);
    border-radius: 8px;
    overflow: hidden;
    transition: background-color 0.3s;
}

.toolbar {
    padding: 10px;
    background-color: var(--toolbar-bg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    gap: 20px;
    transition: background-color 0.3s;
}

.file-operations,
.text-operations {
    display: flex;
    gap: 10px;
    align-items: center;
}

button {
    padding: 8px 12px;
    border: none;
    background-color: transparent;
    cursor: pointer;
    border-radius: 4px;
    transition: background-color 0.2s;
    color: var(--text-color);
}

button:hover {
    background-color: var(--button-hover);
}

select {
    padding: 6px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    background-color: var(--container-bg);
    color: var(--text-color);
}

.editor-container {
    height: 70vh;
    padding: 20px;
    overflow-y: auto;
}

#editor {
    width: 100%;
    height: 100%;
    outline: none;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--container-bg);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

.status-bar {
    padding: 10px;
    background-color: var(--toolbar-bg);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    color: var(--status-text-color);
    font-size: 14px;
    transition: background-color 0.3s;
}

/* Active state for formatting buttons */
button.active {
    background-color: #e9ecef;
    color: #0d6efd;
}

.theme-toggle {
    margin-left: auto;
}

#themeToggle i {
    font-size: 1.2em;
}