/* CSS Variables for theming */
:root {
    /* Light theme */
    --bg-primary: #ffffff;
    --bg-secondary: #f3f3f3;
    --bg-tertiary: #e8e8e8;
    --text-primary: #1e1e1e;
    --text-secondary: #6e6e6e;
    --border-color: #d4d4d4;
    --border-focus: #007acc;
    --editor-bg: #ffffff;
    --line-number-bg: #f3f3f3;
    --line-number-color: #858585;
    --gutter-bg: #f3f3f3;
    --gutter-border: #e0e0e0;
    
    /* VS Code-style diff colors */
    --diff-added-bg: #e6ffed;
    --diff-added-border: #a3d9a4;
    --diff-removed-bg: #ffe6e6;
    --diff-removed-border: #f4a3a3;
    --diff-modified-bg: #fff3cd;
    --diff-modified-border: #ffeaa7;
    --diff-added-text: #22863a;
    --diff-removed-text: #cb2431;
    --diff-modified-text: #b08800;
    
    /* Inline diff colors */
    --inline-added-bg: #acf2bd;
    --inline-removed-bg: #fdb8c0;
    --inline-added-text: #22863a;
    --inline-removed-text: #cb2431;
    
    /* Whitespace indicators */
    --whitespace-color: #d0d0d0;
    --tab-indicator: #ff6b6b;
    --space-indicator: #4ec9b0;
    
    /* Button colors */
    --btn-primary-bg: #007acc;
    --btn-primary-text: #ffffff;
    --btn-secondary-bg: #f3f3f3;
    --btn-secondary-text: #1e1e1e;
    --btn-hover-bg: #005a9e;
    --btn-secondary-hover-bg: #e0e0e0;
}

[data-theme="dark"] {
    /* Dark theme */
    --bg-primary: #1e1e1e;
    --bg-secondary: #252526;
    --bg-tertiary: #2d2d30;
    --text-primary: #cccccc;
    --text-secondary: #969696;
    --border-color: #3c3c3c;
    --border-focus: #007acc;
    --editor-bg: #1e1e1e;
    --line-number-bg: #252526;
    --line-number-color: #858585;
    --gutter-bg: #252526;
    --gutter-border: #3c3c3c;
    
    /* VS Code-style diff colors for dark theme */
    --diff-added-bg: #0c2b0c;
    --diff-added-border: #1b4f1b;
    --diff-removed-bg: #2b0c0c;
    --diff-removed-border: #4f1b1b;
    --diff-modified-bg: #2b2b0c;
    --diff-modified-border: #4f4f1b;
    --diff-added-text: #4ec9b0;
    --diff-removed-text: #f44747;
    --diff-modified-text: #d7ba7d;
    
    /* Inline diff colors for dark theme */
    --inline-added-bg: #0c2b0c;
    --inline-removed-bg: #2b0c0c;
    --inline-added-text: #4ec9b0;
    --inline-removed-text: #f44747;
    
    /* Whitespace indicators for dark theme */
    --whitespace-color: #6e6e6e;
    --tab-indicator: #ff6b6b;
    --space-indicator: #4ec9b0;
    
    /* Button colors for dark theme */
    --btn-primary-bg: #007acc;
    --btn-primary-text: #ffffff;
    --btn-secondary-bg: #3c3c3c;
    --btn-secondary-text: #cccccc;
    --btn-hover-bg: #005a9e;
    --btn-secondary-hover-bg: #4c4c4c;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
}

/* Toolbar */
.toolbar {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 8px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    min-height: 48px;
}

.toolbar-group {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 0 8px;
    border-right: 1px solid var(--border-color);
}

.toolbar-group:last-child {
    border-right: none;
}

.btn {
    background-color: var(--btn-secondary-bg);
    color: var(--btn-secondary-text);
    border: 1px solid var(--border-color);
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 4px;
}

.btn:hover {
    background-color: var(--btn-secondary-hover-bg);
}

.btn.active {
    background-color: var(--btn-primary-bg);
    color: var(--btn-primary-text);
    border-color: var(--btn-primary-bg);
}

.btn-primary {
    background-color: var(--btn-primary-bg);
    color: var(--btn-primary-text);
}

.btn-primary:hover {
    background-color: var(--btn-hover-bg);
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 4px;
}

.checkbox-group input[type="checkbox"] {
    margin: 0;
}

.font-size-controls {
    display: flex;
    align-items: center;
    gap: 4px;
}

.font-size-controls button {
    width: 24px;
    height: 24px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Main container */
.main-container {
    display: flex;
    height: calc(100vh - 48px);
    position: relative;
}

/* Editor container */
.editor-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border-color);
}

.editor-container:last-child {
    border-right: none;
}

.editor-header {
    background-color: var(--bg-tertiary);
    padding: 8px 12px;
    border-bottom: 1px solid var(--border-color);
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
}

.editor-wrapper {
    flex: 1;
    display: flex;
    position: relative;
    overflow: hidden;
}

/* Line numbers */
.line-numbers {
    background-color: var(--line-number-bg);
    border-right: 1px solid var(--gutter-border);
    padding: 8px 0;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    color: var(--line-number-color);
    text-align: right;
    user-select: none;
    min-width: 50px;
    overflow-y: hidden;
    z-index: 3;
}

.line-number {
    padding: 0 8px;
    height: 20px;
    line-height: 20px;
    white-space: nowrap;
}

/* Gutter */
.gutter {
    background-color: var(--gutter-bg);
    border-right: 1px solid var(--gutter-border);
    width: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 8px 0;
    z-index: 3;
}

.gutter-marker {
    width: 12px;
    height: 12px;
    margin: 4px 0;
    border-radius: 2px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 8px;
    font-weight: bold;
    color: white;
}

.gutter-marker.added {
    background-color: var(--diff-added-text);
}

.gutter-marker.removed {
    background-color: var(--diff-removed-text);
}

.gutter-marker.modified {
    background-color: var(--diff-modified-text);
}

/* Text editor */
.text-editor {
    flex: 1;
    background-color: var(--editor-bg);
    color: var(--text-primary);
    border: none;
    outline: none;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    line-height: 20px;
    padding: 8px 12px;
    resize: none;
    white-space: pre;
    overflow-wrap: normal;
    overflow-x: auto;
    overflow-y: auto;
    position: relative;
    z-index: 1;
}

.text-editor:focus {
    border: 1px solid var(--border-focus);
}

/* Editor lines container for diff highlighting */
.editor-lines {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: transparent;
    pointer-events: none;
    z-index: 2;
    overflow: hidden;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    line-height: 20px;
    padding: 8px 0;
}

/* VS Code-style diff highlighting */
.diff-line {
    position: relative;
    border-left: 3px solid transparent;
    margin: 0;
    padding: 0 12px;
    height: 20px;
    line-height: 20px;
    white-space: pre;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
}

.diff-line.equal {
    background-color: transparent !important;
    border-left-color: transparent !important;
    color: transparent !important;
    pointer-events: none;
}

.diff-line.added {
    background-color: var(--diff-added-bg);
    border-left-color: var(--diff-added-border);
}

.diff-line.removed {
    background-color: var(--diff-removed-bg);
    border-left-color: var(--diff-removed-border);
}

.diff-line.modified {
    background-color: var(--diff-modified-bg);
    border-left-color: var(--diff-modified-border);
}

/* Inline diff highlighting */
.diff-word {
    padding: 1px 2px;
    border-radius: 2px;
    font-weight: 500;
}

.diff-word.added {
    background-color: var(--inline-added-bg);
    color: var(--inline-added-text);
}

.diff-word.removed {
    background-color: var(--inline-removed-bg);
    color: var(--inline-removed-text);
    text-decoration: line-through;
}

.diff-word.modified {
    background-color: var(--diff-modified-bg);
    color: var(--diff-modified-text);
}

/* Whitespace visualization */
.whitespace-char {
    position: relative;
    display: inline-block;
    width: 1ch;
    height: 1em;
}

.whitespace-char.space::after {
    content: '·';
    color: var(--space-indicator);
    position: absolute;
    top: 0;
    left: 0;
    font-weight: bold;
}

.whitespace-char.tab::after {
    content: '→';
    color: var(--tab-indicator);
    position: absolute;
    top: 0;
    left: 0;
    font-weight: bold;
}

.whitespace-char.trailing::after {
    content: '·';
    color: var(--whitespace-color);
    position: absolute;
    top: 0;
    right: 0;
    font-weight: bold;
}

/* Line highlighting for current diff */
.diff-line.current {
    background-color: var(--border-focus) !important;
    opacity: 0.8;
}

/* Status bar */
.status-bar {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 4px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: var(--text-secondary);
    height: 24px;
}

.status-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.status-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Navigation controls */
.nav-controls {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-controls button {
    width: 20px;
    height: 20px;
    padding: 0;
    font-size: 10px;
}

/* Responsive design */
@media (max-width: 768px) {
    .toolbar {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }

    .toolbar-group {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding-bottom: 8px;
    }

    .toolbar-group:last-child {
        border-bottom: none;
    }

    .main-container {
        flex-direction: column;
        height: calc(100vh - 120px);
    }

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

    .editor-container:last-child {
        border-bottom: none;
    }
}

/* Scrollbar styling */
.text-editor::-webkit-scrollbar {
    width: 12px;
}

.text-editor::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

.text-editor::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 6px;
}

.text-editor::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* File upload */
.file-upload {
    display: none;
}

/* Loading indicator */
.loading {
    display: none;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: var(--bg-secondary);
    padding: 16px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    z-index: 1000;
}

.loading.show {
    display: block;
}

/* Sample text */
.sample-text {
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    line-height: 20px;
    white-space: pre;
}