/* Professional Notepad - Cursor-style Dark Theme
 * Modern code editor with file explorer and comprehensive editing features
 * CSS Variables for consistent theming and easy customization
 */

/* ===== ROOT VARIABLES ===== */
:root {
    /* Light theme colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-muted: #adb5bd;
    --border-color: #dee2e6;
    --accent-color: #007bff;
    --accent-hover: #0056b3;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    
    /* UI element colors */
    --toolbar-bg: var(--bg-secondary);
    --sidebar-bg: var(--bg-tertiary);
    --editor-bg: var(--bg-primary);
    --line-number-bg: var(--bg-secondary);
    --line-number-color: var(--text-secondary);
    --button-bg: var(--bg-primary);
    --button-hover: var(--bg-tertiary);
    --dialog-bg: var(--bg-primary);
    
    /* Spacing and sizing */
    --toolbar-height: 40px;
    --sidebar-width: 240px;
    --font-size: 14px;
    --font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', 'Consolas', monospace;
    --border-radius: 4px;
    --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.2s ease;
}

/* Dark theme variables */
.theme-dark {
    --bg-primary: #1e1e1e;
    --bg-secondary: #252526;
    --bg-tertiary: #2d2d30;
    --text-primary: #cccccc;
    --text-secondary: #969696;
    --text-muted: #6a6a6a;
    --border-color: #3e3e42;
    --accent-color: #0078d4;
    --accent-hover: #106ebe;
    --success-color: #4fc3f7;
    --warning-color: #ffb74d;
    --danger-color: #f48fb1;
    
    --toolbar-bg: var(--bg-tertiary);
    --sidebar-bg: var(--bg-secondary);
    --editor-bg: var(--bg-primary);
    --line-number-bg: var(--bg-secondary);
    --line-number-color: var(--text-secondary);
    --button-bg: transparent;
    --button-hover: rgba(255, 255, 255, 0.1);
    --dialog-bg: var(--bg-tertiary);
}

/* ===== RESET AND BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
    transition: var(--transition);
}

/* Focus visible styles for accessibility */
*:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 1px;
}

/* ===== MAIN LAYOUT ===== */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    background-color: var(--bg-primary);
}

/* ===== TOOLBAR ===== */
.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: var(--toolbar-height);
    background-color: var(--toolbar-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 0 12px;
    flex-shrink: 0;
}

.toolbar-section {
    display: flex;
    align-items: center;
    gap: 4px;
}

.toolbar-btn {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 6px 8px;
    background-color: var(--button-bg);
    border: 1px solid transparent;
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 12px;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.toolbar-btn:hover {
    background-color: var(--button-hover);
    border-color: var(--border-color);
}

.toolbar-btn.active {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

.btn-icon {
    font-size: 14px;
    line-height: 1;
}

.btn-text {
    font-size: 11px;
    font-weight: 500;
}

.toolbar-separator {
    width: 1px;
    height: 20px;
    background-color: var(--border-color);
    margin: 0 8px;
}

/* ===== MAIN CONTENT ===== */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* ===== SIDEBAR ===== */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--sidebar-bg);
}

.sidebar-controls {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--sidebar-bg);
}

.file-search {
    flex: 1;
    padding: 4px 8px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--editor-bg);
    color: var(--text-primary);
    font-size: 12px;
    outline: none;
}

.file-search:focus {
    border-color: var(--accent-color);
}

.sort-dropdown {
    padding: 4px 8px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--editor-bg);
    color: var(--text-primary);
    font-size: 12px;
    cursor: pointer;
    outline: none;
}

.sort-dropdown:focus {
    border-color: var(--accent-color);
}

.sidebar-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

.sidebar-actions {
    display: flex;
    gap: 4px;
}

.icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background-color: transparent;
    border: none;
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    font-size: 12px;
}

.icon-btn:hover {
    background-color: var(--button-hover);
    color: var(--text-primary);
}

/* File Tree Styles */
.file-tree {
    flex: 1;
    overflow-y: auto;
    padding: 4px;
    background-color: var(--sidebar-bg);
}

.file-tree:empty::before {
    content: 'No files yet. Create your first file!';
    display: block;
    padding: 20px 12px;
    text-align: center;
    color: var(--text-muted);
    font-style: italic;
    font-size: 12px;
}

.tree-item {
    display: flex;
    align-items: center;
    padding: 6px 8px;
    margin: 2px 4px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-primary);
    transition: var(--transition);
    position: relative;
    user-select: none;
    border: 1px solid transparent;
}

.tree-item.dragging {
    opacity: 0.5;
    transform: scale(0.95);
}

.tree-item.drop-target {
    border-color: var(--accent-color);
    background-color: rgba(0, 120, 212, 0.1);
}

.tree-item:hover {
    background-color: var(--button-hover);
    border-color: var(--border-color);
}

.tree-item:hover .tree-actions {
    opacity: 1;
}

.tree-item.selected {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    font-weight: 500;
}

.tree-item.selected .tree-actions {
    opacity: 1;
}

.tree-item.selected .tree-actions button {
    color: white;
}

.tree-item.selected .tree-actions button:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

.tree-item.editing input {
    background: transparent;
    border: 1px solid var(--accent-color);
    color: var(--text-primary);
    font-size: 13px;
    padding: 2px 4px;
    border-radius: 2px;
    width: 100%;
}

.tree-icon {
    margin-right: 8px;
    font-size: 14px;
    width: 16px;
    text-align: center;
    flex-shrink: 0;
}

.tree-expand {
    margin-right: 4px;
    font-size: 10px;
    width: 12px;
    text-align: center;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
    flex-shrink: 0;
}

.tree-expand:hover {
    color: var(--text-primary);
}

.tree-expand.expanded {
    transform: rotate(90deg);
}

.tree-name {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.tree-actions {
    display: flex;
    gap: 2px;
    opacity: 0;
    transition: var(--transition);
    margin-left: 4px;
}

.tree-action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    border: none;
    border-radius: 3px;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    font-size: 10px;
}

.tree-action-btn:hover {
    background-color: var(--button-hover);
    color: var(--text-primary);
}

.tree-indent {
    margin-left: 20px;
}

.tree-item[data-depth="1"] { padding-left: 16px; }
.tree-item[data-depth="2"] { padding-left: 32px; }
.tree-item[data-depth="3"] { padding-left: 48px; }
.tree-item[data-depth="4"] { padding-left: 64px; }

.file-type-txt .tree-icon::before { content: '📄'; }
.file-type-md .tree-icon::before { content: '📝'; }
.file-type-js .tree-icon::before { content: '📜'; }
.file-type-css .tree-icon::before { content: '🎨'; }
.file-type-html .tree-icon::before { content: '🌐'; }
.file-type-json .tree-icon::before { content: '⚙️'; }
.file-type-py .tree-icon::before { content: '🐍'; }
.file-type-unknown .tree-icon::before { content: '📄'; }

.folder-icon .tree-icon::before { content: '📁'; }
.folder-icon.expanded .tree-icon::before { content: '📂'; }

.tree-item.recent::after {
    content: '●';
    color: var(--success-color);
    font-size: 8px;
    margin-left: 4px;
}

/* Keyboard navigation */
.tree-item:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: -1px;
}

.tree-item:focus:not(:focus-visible) {
    outline: none;
}

/* Empty state styling */
.file-tree-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 200px;
    color: var(--text-muted);
    text-align: center;
}

.file-tree-empty-icon {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.file-tree-empty-text {
    font-size: 14px;
    margin-bottom: 8px;
}

.file-tree-empty-hint {
    font-size: 12px;
    opacity: 0.7;
}

/* Loading state */
.file-tree.loading {
    opacity: 0.6;
    pointer-events: none;
}

.file-tree.loading::after {
    content: 'Loading...';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--text-secondary);
    font-size: 14px;
}

/* ===== EDITOR PANEL ===== */
.editor-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Find Bar */
.find-bar {
    background-color: var(--toolbar-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 8px 12px;
    flex-shrink: 0;
}

.find-controls {
    display: flex;
    align-items: center;
    gap: 8px;
    max-width: 500px;
}

.find-input {
    flex: 1;
    padding: 4px 8px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--editor-bg);
    color: var(--text-primary);
    font-size: 13px;
    font-family: var(--font-family);
}

.find-results {
    font-size: 12px;
    color: var(--text-secondary);
    white-space: nowrap;
    min-width: 80px;
}

.find-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background-color: var(--button-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
    font-size: 12px;
}

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

/* Editor Container */
.editor-container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.line-numbers {
    background-color: var(--line-number-bg);
    color: var(--line-number-color);
    padding: 8px 8px 8px 12px;
    font-family: var(--font-family);
    font-size: var(--font-size);
    line-height: 1.5;
    text-align: right;
    user-select: none;
    border-right: 1px solid var(--border-color);
    white-space: pre;
    overflow: hidden;
    min-width: 50px;
    flex-shrink: 0;
}

#editor {
    flex: 1;
    border: none;
    outline: none;
    padding: 8px 12px;
    font-family: var(--font-family);
    font-size: var(--font-size);
    line-height: 1.5;
    background-color: var(--editor-bg);
    color: var(--text-primary);
    resize: none;
    overflow-y: auto;
    white-space: pre;
    overflow-wrap: normal;
    transition: background-color 0.2s ease;
}

/* Bold text styles */
.bold-enabled #editor {
    font-weight: bold;
}

/* ===== STATUS BAR ===== */
.status-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 22px;
    background-color: var(--toolbar-bg);
    border-top: 1px solid var(--border-color);
    padding: 0 12px;
    font-size: 11px;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.status-left {
    display: flex;
    align-items: center;
    gap: 8px;
}

.status-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.status-separator {
    color: var(--border-color);
}

#current-file {
    font-weight: 500;
    color: var(--text-primary);
}

#save-indicator {
    color: var(--success-color);
    font-weight: 500;
}

#save-indicator.saving {
    color: var(--warning-color);
}

/* ===== DIALOGS ===== */
.settings-modal {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--dialog-bg);
    color: var(--text-primary);
    padding: 0;
    max-width: 500px;
    width: 90%;
    box-shadow: var(--shadow-medium);
}

.settings-modal::backdrop {
    background-color: rgba(0, 0, 0, 0.6);
}

.settings-content {
    padding: 24px;
}

.settings-content h3 {
    margin-bottom: 20px;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.setting-group {
    margin-bottom: 16px;
}

.setting-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    font-size: 13px;
    color: var(--text-primary);
}

.setting-group select {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--editor-bg);
    color: var(--text-primary);
    font-size: 13px;
    font-family: inherit;
}

.settings-buttons {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 24px;
}

.settings-btn {
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--button-bg);
    color: var(--text-primary);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: var(--transition);
}

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

.settings-btn.primary {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

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

/* ===== CONTEXT MENU ===== */
.context-menu {
    position: fixed;
    background-color: var(--dialog-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    padding: 6px 0;
    z-index: 1000;
    min-width: 160px;
    backdrop-filter: blur(10px);
}

.context-item {
    display: flex;
    align-items: center;
    padding: 8px 16px;
    font-size: 13px;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
    gap: 8px;
}

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

.context-item:active {
    background-color: var(--accent-color);
    color: white;
}

.context-item.danger {
    color: var(--danger-color);
}

.context-item.danger:hover {
    background-color: var(--danger-color);
    color: white;
}

.context-item:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.context-separator {
    height: 1px;
    background-color: var(--border-color);
    margin: 4px 0;
}

/* ===== SCROLLBARS ===== */
/* Webkit scrollbars */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 4px;
}

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

/* Firefox scrollbars */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--text-muted) var(--bg-secondary);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 1024px) {
    .sidebar {
        width: 200px;
    }
    
    .btn-text {
        display: none;
    }
    
    .toolbar-btn {
        padding: 6px;
    }
}

@media (max-width: 768px) {
    .sidebar {
        position: absolute;
        left: -240px;
        height: calc(100vh - var(--toolbar-height) - 22px);
        z-index: 100;
        transition: left 0.3s ease;
    }
    
    .sidebar.open {
        left: 0;
    }
    
    .toolbar-separator {
        display: none;
    }
    
    .find-controls {
        flex-wrap: wrap;
    }
    
    .find-results {
        order: -1;
        width: 100%;
        margin-bottom: 4px;
    }
}

@media (max-width: 480px) {
    .app-container {
        font-size: 12px;
    }
    
    .sidebar {
        width: 100%;
        left: -100%;
    }
    
    .editor-container {
        flex-direction: column;
    }
    
    .line-numbers {
        display: none;
    }
    
    #editor {
        padding: 12px;
    }
}

/* ===== UTILITY CLASSES ===== */
.hidden {
    display: none !important;
}

.loading {
    opacity: 0.6;
    pointer-events: none;
}

.highlight {
    background-color: var(--warning-color);
    color: var(--bg-primary);
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideDown {
    from { transform: translateY(-100%); }
    to { transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.2s ease;
}

.slide-down {
    animation: slideDown 0.2s ease;
}

/* ===== PRINT STYLES ===== */
@media print {
    .toolbar,
    .sidebar,
    .status-bar,
    .find-bar {
        display: none !important;
    }
    
    .main-content {
        display: block;
    }
    
    .editor-panel {
        width: 100%;
    }
    
    #editor {
        border: none;
        background: white;
        color: black;
        font-size: 12px;
        line-height: 1.4;
    }
}