:root {
    /* Colors - Dark Theme */
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-tertiary: #0f3460;
    --text-primary: #eaeaea;
    --text-secondary: #a0a0a0;
    --text-muted: #666;
    --accent: #e94560;
    --accent-hover: #ff6b8a;
    --success: #4caf50;
    --warning: #ff9800;
    --danger: #f44336;
    --border: #2a2a4a;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Sizes */
    --sidebar-width: 280px;
    --toolbar-height: 50px;
    --status-bar-height: 28px;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    --font-size-base: 16px;
    --font-size-editor: 16px;

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

/* Light theme */
body.light-mode {
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-tertiary: #e0e0e0;
    --text-primary: #1a1a1a;
    --text-secondary: #555;
    --text-muted: #999;
    --border: #ddd;
}

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

html {
    font-size: var(--font-size-base);
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow: hidden;
    height: 100vh;
    height: 100dvh;
    display: flex;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    height: 100dvh;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    left: 0;
    top: 0;
    z-index: 100;
    transform: translateX(0);
    transition: transform var(--transition-normal);
}

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

.sidebar-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent);
}

.sidebar-header h2 i {
    margin-right: var(--spacing-sm);
}

#closeSidebar {
    display: none;
}

.sidebar-section {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border);
}

.sidebar-section h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.sidebar-section h3 i {
    margin-right: var(--spacing-xs);
}

.file-list-section {
    flex: 1;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.file-list {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
}

.file-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    border-radius: 4px;
    margin: 2px 0;
    transition: background var(--transition-fast);
}

.file-item:hover {
    background: var(--bg-tertiary);
}

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

.file-item i {
    margin-right: var(--spacing-sm);
    font-size: 0.9rem;
}

.file-item .file-name {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 0.9rem;
}

.file-item.encrypted i:first-child {
    color: var(--warning);
}

.empty-state {
    color: var(--text-muted);
    font-size: 0.85rem;
    text-align: center;
    padding: var(--spacing-lg);
}

.sidebar-footer {
    padding: var(--spacing-md);
    border-top: 1px solid var(--border);
}

/* Sidebar Overlay */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    margin-left: var(--sidebar-width);
    height: 100vh;
    height: 100dvh;
    transition: margin-left var(--transition-normal);
}

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

.toolbar-left,
.toolbar-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.file-name {
    font-weight: 500;
    max-width: 200px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.modified-indicator {
    color: var(--accent);
    font-size: 1.5rem;
    line-height: 1;
}

#menuBtn {
    display: none;
}

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

.editor-wrapper,
.preview-wrapper {
    flex: 1;
    overflow: hidden;
    display: flex;
}

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

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

.preview-wrapper {
    background: var(--bg-primary);
    border-left: 1px solid var(--border);
}

.preview {
    width: 100%;
    height: 100%;
    padding: var(--spacing-md);
    overflow-y: auto;
}

.preview h1,
.preview h2,
.preview h3,
.preview h4 {
    color: var(--accent);
    margin: 1em 0 0.5em;
}

.preview h1 {
    font-size: 1.8rem;
}

.preview h2 {
    font-size: 1.5rem;
}

.preview h3 {
    font-size: 1.25rem;
}

.preview p {
    margin: 0.5em 0;
}

.preview code {
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 3px;
    font-family: var(--font-mono);
    font-size: 0.9em;
}

.preview pre {
    background: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: 6px;
    overflow-x: auto;
    margin: 1em 0;
}

.preview pre code {
    background: none;
    padding: 0;
}

.preview blockquote {
    border-left: 3px solid var(--accent);
    padding-left: var(--spacing-md);
    margin: 1em 0;
    color: var(--text-secondary);
}

.preview ul,
.preview ol {
    padding-left: var(--spacing-lg);
    margin: 0.5em 0;
}

.preview a {
    color: var(--accent);
}

.preview img {
    max-width: 100%;
    height: auto;
}

.preview table {
    border-collapse: collapse;
    width: 100%;
    margin: 1em 0;
}

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

.preview th {
    background: var(--bg-secondary);
}

/* Status Bar */
.status-bar {
    height: var(--status-bar-height);
    background: var(--bg-tertiary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 var(--spacing-md);
    font-size: 0.75rem;
    color: var(--text-secondary);
    flex-shrink: 0;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    width: 100%;
    margin-top: var(--spacing-sm);
}

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

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

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

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

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}

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

.btn-danger {
    background: var(--danger);
    color: white;
}

.btn-danger:hover {
    opacity: 0.9;
}

.icon-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: 6px;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

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

/* Status Badge */
.status-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.8rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 4px;
    background: var(--bg-tertiary);
}

.status-badge.connected i {
    color: var(--success);
}

.status-badge.disconnected i {
    color: var(--text-muted);
}

.status-badge.locked {
    background: rgba(255, 193, 7, 0.1);
    color: #ffc107;
    border: 1px solid rgba(255, 193, 7, 0.3);
}

.status-badge.locked i {
    color: #ffc107;
}

/* Form Elements */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.input:focus {
    outline: none;
    border-color: var(--accent);
}

.input::placeholder {
    color: var(--text-muted);
}

/* Modals */
.modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.7);
    z-index: 200;
    padding: var(--spacing-md);
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: var(--spacing-lg);
    max-width: 400px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-content.modal-large {
    max-width: 500px;
}

.modal-content h3 {
    margin-bottom: var(--spacing-md);
    color: var(--accent);
}

.modal-content h3 i {
    margin-right: var(--spacing-sm);
}

.modal-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.modal-header h3 {
    flex: 1;
    margin-bottom: 0;
}

.modal-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
    margin-top: var(--spacing-lg);
}

.modal-actions .btn {
    width: auto;
    margin-top: 0;
}

/* Browser File List */
.browser-path {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding: var(--spacing-sm);
    background: var(--bg-tertiary);
    border-radius: 4px;
    margin-bottom: var(--spacing-md);
    word-break: break-all;
}

.browser-file-list {
    max-height: 300px;
    overflow-y: auto;
    border: 1px solid var(--border);
    border-radius: 6px;
}

.browser-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    border-bottom: 1px solid var(--border);
    transition: background var(--transition-fast);
}

.browser-item:last-child {
    border-bottom: none;
}

.browser-item:hover {
    background: var(--bg-tertiary);
}

.browser-item i {
    margin-right: var(--spacing-sm);
    color: var(--text-secondary);
}

.browser-item.folder i {
    color: var(--warning);
}

.browser-item.encrypted i:first-child {
    color: var(--accent);
}

.loading {
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--text-muted);
}

/* Danger Zone */
.danger-zone {
    border-top: 1px solid var(--danger);
    padding-top: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.danger-zone h4 {
    color: var(--danger);
    font-size: 0.85rem;
    margin-bottom: var(--spacing-sm);
}

/* Toast */
.toast-container {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 300;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: var(--spacing-md);
    min-width: 250px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    animation: slideIn 0.3s ease;
}

.toast.success {
    border-left: 4px solid var(--success);
}

.toast.error {
    border-left: 4px solid var(--danger);
}

.toast.warning {
    border-left: 4px solid var(--warning);
}

.toast.info {
    border-left: 4px solid var(--accent);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Utility */
.hidden {
    display: none !important;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-overlay.active {
        display: block;
    }

    #closeSidebar {
        display: flex;
    }

    #menuBtn {
        display: flex;
    }

    .main-content {
        margin-left: 0;
    }

    .editor-container {
        flex-direction: column;
    }

    .editor-wrapper,
    .preview-wrapper {
        min-height: 50%;
    }

    .preview-wrapper {
        border-left: none;
        border-top: 1px solid var(--border);
    }

    .file-name {
        max-width: 120px;
    }

    .toast-container {
        left: var(--spacing-md);
        right: var(--spacing-md);
        bottom: calc(var(--status-bar-height) + var(--spacing-md));
    }

    .toast {
        min-width: auto;
    }
}

/* Split view mode (desktop) */
.editor-container.split-view .editor-wrapper,
.editor-container.split-view .preview-wrapper {
    flex: 1;
}

.editor-container.split-view .preview-wrapper {
    display: flex;
}

/* Preview only mode */
.editor-container.preview-only .editor-wrapper {
    display: none;
}

.editor-container.preview-only .preview-wrapper {
    flex: 1;
    border-left: none;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

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

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

/* Visual Editor */
.visual-editor {
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: var(--spacing-md);
    overflow-y: auto;
    outline: none;
    line-height: 1.7;
}

.visual-editor[contenteditable]:empty::before {
    content: attr(placeholder);
    color: var(--text-muted);
}

.visual-editor h1,
.visual-editor h2,
.visual-editor h3 {
    color: var(--accent);
    margin: 1em 0 0.5em;
}

.visual-editor pre {
    background: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: 6px;
    margin: 1em 0;
}

/* Formatting Toolbar */
.formatting-toolbar {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 6px;
    display: flex;
    gap: 4px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    z-index: 1000;
    transition: all 0.3s ease;
}

.formatting-toolbar.hidden {
    opacity: 0;
    pointer-events: none;
    transform: translateX(-50%) translateY(20px);
}

.formatting-toolbar.docked-top {
    top: 0;
    bottom: auto;
    left: 0;
    width: 100%;
    transform: none;
    border-radius: 0;
    border: none;
    border-bottom: 1px solid var(--border);
    justify-content: center;
}

.formatting-toolbar.docked-top.hidden {
    transform: translateY(-100%);
}

.formatting-toolbar.docked-bottom {
    top: auto;
    bottom: 0;
    left: 0;
    width: 100%;
    transform: none;
    border-radius: 0;
    border: none;
    border-top: 1px solid var(--border);
    justify-content: center;
}

.formatting-toolbar.docked-bottom.hidden {
    transform: translateY(100%);
}

/* Adjust Editor Padding */
.toolbar-docked-top .visual-editor {
    padding-top: 60px;
}

.toolbar-docked-bottom .visual-editor {
    padding-bottom: 60px;
}

/* Default floating padding */
.visual-editor {
    padding-bottom: 80px;
}

.format-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    color: var(--text-secondary);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

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

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

/* Context Menu */
.context-menu {
    position: fixed;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 6px 0;
    min-width: 160px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    z-index: 1500;
}

.menu-item {
    padding: 8px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background 0.2s;
}

.menu-item:hover {
    background: var(--bg-tertiary);
}

.menu-item i {
    width: 16px;
    color: var(--text-secondary);
}

.menu-divider {
    height: 1px;
    background: var(--border);
    margin: 6px 0;
}