styles.css

/*
 * Global Styles and Theme Variables
 */
:root {
    /* Base font size – makes rem calculations easy */
    font-size: 16px;

    /* Light theme defaults */
    --bg-color: #f0f0f0;
    --text-color: #333333;
    --toolbar-bg: #e0e0e0;
    --button-bg: #007bff;
    --button-hover-bg: #0056b3;
    --button-text: #ffffff;
    --code-bg: #f5f5f5;
    --code-text: #2d2d2d;
    --border-color: #cccccc;
    --editor-bg: #ffffff;
    --preview-bg: #fafafa;
}

/* Dark theme – activated by adding data-theme="dark" to <html> or <body> */
[data-theme="dark"] {
    --bg-color: #1e1e1e;
    --text-color: #e0e0e0;
    --toolbar-bg: #2c2c2c;
    --button-bg: #4a90e2;
    --button-hover-bg: #357ab8;
    --button-text: #ffffff;
    --code-bg: #2d2d2d;
    --code-text: #f8f8f2;
    --border-color: #555555;
    --editor-bg: #2b2b2b;
    --preview-bg: #2a2a2a;
}

body {
    margin: 0;
    padding: 0;
    font-family: Arial, Helvetica, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.5;
}

/* Layout container */
.app {
    display: grid;
    grid-template-columns: 1fr 1fr; /* two equal columns */
    gap: 1rem;
    padding: 1rem;
    max-width: 1200px;
    margin: 0 auto;
    box-sizing: border-box;
    background-color: var(--bg-color);
}

/* Toolbar */
.toolbar {
    grid-column: 1 / -1; /* span full width */
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--toolbar-bg);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    box-sizing: border-box;
}

.toolbar button {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    font-size: 1rem;
    padding: 0.4rem 0.6rem;
    border-radius: 4px;
    transition: background-color 0.2s ease;
}

.toolbar button:hover {
    background-color: rgba(0, 0, 0, 0.1);
}

/* Theme toggle button – usually placed inside .toolbar */
.theme-toggle {
    margin-left: auto; /* push to the right */
    background-color: var(--button-bg);
    color: var(--button-text);
    padding: 0.4rem 0.8rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.theme-toggle:hover {
    background-color: var(--button-hover-bg);
}

/* Editor styling */
.editor {
    /* container for the textarea – using the same grid cell as before */
    display: flex;
    flex-direction: column;
}

.editor textarea,
#editor {
    font-family: "Courier New", Courier, monospace;
    font-size: 1rem;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    resize: vertical;
    width: 100%;
    height: 300px;
    box-sizing: border-box;
    background-color: var(--editor-bg);
    color: var(--text-color);
}

/* Preview pane styling */
.preview,
#preview {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--preview-bg);
    overflow: auto;
    min-height: 300px;
    box-sizing: border-box;
    color: var(--text-color);
}

/* Controls (buttons) – kept for backward compatibility */
.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.controls button {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 4px;
    background-color: var(--button-bg);
    color: var(--button-text);
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.2s ease;
}

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

/* Responsive layout – stack columns on narrow screens */
@media (max-width: 600px) {
    .app {
        grid-template-columns: 1fr; /* single column */
    }
    .toolbar {
        flex-wrap: wrap;
    }
}

/* Highlight.js syntax highlighting – basic theme that respects our CSS variables */
.hljs {
    display: block;
    overflow-x: auto;
    padding: 0.5rem;
    background: var(--code-bg);
    color: var(--code-text);
    border-radius: 4px;
}

.hljs-comment,
.hljs-quote {
    color: #6a9955; /* comment color – will adapt in dark mode via variable if needed */
    font-style: italic;
}

.hljs-keyword,
.hljs-selector-tag,
.hljs-subst {
    color: #569cd6;
    font-weight: bold;
}

.hljs-string,
.hljs-title,
.hljs-section,
.hljs-attribute,
.hljs-attr {
    color: #ce9178;
}

.hljs-number,
.hljs-symbol,
.hljs-bullet,
.hljs-addition {
    color: #b5cea8;
}

.hljs-variable,
.hljs-template-variable,
.hljs-link {
    color: #9cdcfe;
}

.hljs-built_in,
.hljs-builtin-name {
    color: #dcdcaa;
}

.hljs-meta {
    color: #d4d4d4;
}

.hljs-deletion {
    background: #ffdddd;
}

.hljs-emphasis {
    font-style: italic;
}

.hljs-strong {
    font-weight: bold;
}

/* Optional Google Font – uncomment if you want to use a custom font */
/* @import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap');
body { font-family: 'Inter', Arial, Helvetica, sans-serif; } */