/* Browser Notes - Styles
   ====================== */

/* CSS Custom Properties for Theming */
:root {
    /* Light Theme (default) */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #495057;
    --text-muted: #6c757d;
    --border-color: #dee2e6;
    --accent-color: #0d6efd;
    --accent-hover: #0b5ed7;
    --code-bg: #f1f3f5;
    --blockquote-border: #ced4da;
    --focus-ring: rgba(13, 110, 253, 0.25);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Typography */
    --font-mono: 'SF Mono', 'Fira Code', 'Consolas', 'Monaco', monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-tertiary: #0f3460;
    --text-primary: #e9ecef;
    --text-secondary: #adb5bd;
    --text-muted: #868e96;
    --border-color: #495057;
    --accent-color: #4dabf7;
    --accent-hover: #74c0fc;
    --code-bg: #0f3460;
    --blockquote-border: #495057;
    --focus-ring: rgba(77, 171, 247, 0.25);
}

/* Reset & Base Styles */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: var(--font-size-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    line-height: var(--line-height-base);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    min-height: 100vh;
    overflow: hidden;
}

/* App Container */
.app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100%;
}

/* Toolbar */
.toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
    min-height: 48px;
}

.toolbar-title {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.toolbar-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.toolbar-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-md);
    min-width: 44px;
    min-height: 44px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.toolbar-btn:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--accent-color);
}

.toolbar-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--focus-ring);
}

.toolbar-btn:active {
    transform: scale(0.98);
}

/* Main Content - Split View */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Editor Pane */
.editor-pane {
    flex: 1;
    display: flex;
    min-width: 0;
    border-right: 1px solid var(--border-color);
    transition: flex var(--transition-normal);
}

.editor-pane.full-width {
    border-right: none;
}

.editor {
    width: 100%;
    height: 100%;
    padding: var(--spacing-lg);
    border: none;
    outline: none;
    resize: none;
    font-family: var(--font-mono);
    font-size: 0.9375rem;
    line-height: 1.7;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    tab-size: 2;
}

.editor::placeholder {
    color: var(--text-muted);
    opacity: 0.7;
}

.editor:focus {
    outline: none;
}

/* Preview Pane */
.preview-pane {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    background-color: var(--bg-secondary);
    transition: flex var(--transition-normal), opacity var(--transition-normal);
}

.preview-pane.hidden {
    flex: 0;
    opacity: 0;
    overflow: hidden;
}

.preview {
    height: 100%;
    padding: var(--spacing-lg);
    overflow-y: auto;
    overflow-x: hidden;
}

.preview-placeholder {
    color: var(--text-muted);
    font-style: italic;
}

/* Markdown Preview Styles */
.preview h1,
.preview h2,
.preview h3,
.preview h4,
.preview h5,
.preview h6 {
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-primary);
}

.preview h1:first-child,
.preview h2:first-child,
.preview h3:first-child,
.preview h4:first-child,
.preview h5:first-child,
.preview h6:first-child {
    margin-top: 0;
}

.preview h1 { font-size: 2rem; }
.preview h2 { font-size: 1.5rem; }
.preview h3 { font-size: 1.25rem; }
.preview h4 { font-size: 1.125rem; }
.preview h5 { font-size: 1rem; }
.preview h6 { font-size: 0.875rem; }

.preview p {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.preview a {
    color: var(--accent-color);
    text-decoration: none;
}

.preview a:hover {
    text-decoration: underline;
}

.preview strong {
    font-weight: 600;
}

.preview em {
    font-style: italic;
}

.preview ul,
.preview ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-xl);
}

.preview li {
    margin-bottom: var(--spacing-xs);
}

.preview li > ul,
.preview li > ol {
    margin-top: var(--spacing-xs);
    margin-bottom: 0;
}

.preview code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    padding: 0.125em 0.375em;
    background-color: var(--code-bg);
    border-radius: 4px;
    color: var(--text-primary);
}

.preview pre {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--code-bg);
    border-radius: 6px;
    overflow-x: auto;
}

.preview pre code {
    padding: 0;
    background-color: transparent;
    border-radius: 0;
    font-size: 0.875rem;
    line-height: 1.5;
}

.preview blockquote {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    border-left: 4px solid var(--blockquote-border);
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    font-style: italic;
}

.preview blockquote p:last-child {
    margin-bottom: 0;
}

.preview hr {
    margin: var(--spacing-lg) 0;
    border: none;
    border-top: 1px solid var(--border-color);
}

.preview img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
}

.preview table {
    width: 100%;
    margin-bottom: var(--spacing-md);
    border-collapse: collapse;
}

.preview th,
.preview td {
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    text-align: left;
}

.preview th {
    background-color: var(--bg-tertiary);
    font-weight: 600;
}

/* Responsive Design */
@media (max-width: 768px) {
    .toolbar-title {
        font-size: 1rem;
    }

    .toolbar-btn {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.8125rem;
    }

    .editor,
    .preview {
        padding: var(--spacing-md);
    }

    /* Stack view on mobile by default */
    .main-content {
        flex-direction: column;
    }

    .editor-pane {
        flex: 1;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    .preview-pane {
        flex: 1;
    }

    .preview-pane.hidden {
        display: none;
    }
}

@media (max-width: 480px) {
    .toolbar {
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .toolbar-title {
        font-size: 0.9rem;
    }

    .editor,
    .preview {
        padding: var(--spacing-sm);
        font-size: 0.875rem;
    }
}

/* Accessibility - Focus Styles */
*:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-muted: #333333;
    }

    [data-theme="dark"] {
        --border-color: #ffffff;
        --text-muted: #cccccc;
    }
}

/* Print styles */
@media print {
    .toolbar {
        display: none;
    }

    .editor-pane {
        display: none;
    }

    .preview-pane {
        flex: 1;
        background: white;
    }

    .preview {
        color: black;
    }
}