:root {
    /* Light Theme */
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-muted: #9ca3af;
    --border-color: #e5e7eb;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --selection: #dbeafe;
    --sidebar-width: 280px;
    --header-height: 56px;
    --footer-height: 28px;
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --bg-tertiary: #374151;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-muted: #6b7280;
    --border-color: #374151;
    --accent-color: #60a5fa;
    --accent-hover: #93c5fd;
    --selection: #1e3a8a;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

body {
    height: 100vh;
    background: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
    transition: background var(--transition), color var(--transition);
}

/* Layout */
.app {
    display: flex;
    height: 100vh;
    width: 100vw;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: var(--transition);
    z-index: 10;
}

.toolbar {
    padding: 20px 16px;
    display: flex;
    gap: 12px;
}

.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 14px;
    font-size: 14px;
    font-weight: 600;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition);
    flex: 1;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.btn:hover {
    background: var(--bg-tertiary);
    transform: translateY(-2px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn:active {
    transform: translateY(0);
}

.btn.primary {
    background: linear-gradient(135deg, var(--accent-color), #2563eb);
    color: white;
    border: none;
}

.btn.primary:hover {
    background: linear-gradient(135deg, var(--accent-hover), #1d4ed8);
}

/* Search */
.search {
    padding: 0 16px 16px 16px;
}

.search-container {
    position: relative;
    display: flex;
    align-items: center;
}

.search input {
    width: 100%;
    padding: 10px 12px;
    font-size: 14px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
    outline: none;
    transition: all var(--transition);
}

.search input:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
    background: var(--bg-primary);
}

/* File tree */
.file-tree {
    flex: 1;
    overflow-y: auto;
    padding: 8px 0;
}

.file-item {
    display: flex;
    align-items: center;
    padding: 10px 16px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-secondary);
    transition: all var(--transition);
    border-radius: 8px;
    margin: 2px 12px;
    position: relative;
    user-select: none;
}

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


.file-item.active {
    background: var(--selection);
    color: var(--accent-color);
    font-weight: 600;
}

.file-item .icon {
    margin-right: 10px;
    width: 18px;
    text-align: center;
}

.file-item .actions {
    margin-left: auto;
    display: none;
    gap: 4px;
}

.file-item:hover .actions {
    display: flex;
}

.action-btn {
    padding: 2px;
    border-radius: 4px;
    cursor: pointer;
    opacity: 0.6;
    transition: var(--transition);
}

.action-btn:hover {
    opacity: 1;
    background: rgba(0, 0, 0, 0.1);
}

/* Main Content */
.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
    min-width: 0;
    transition: background var(--transition);
}

/* Top bar */
.topbar {
    height: var(--header-height);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    background: var(--bg-primary);
    transition: background var(--transition), border var(--transition);
}

#breadcrumb {
    font-size: 14px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.breadcrumb-item:hover {
    color: var(--text-primary);
    cursor: pointer;
}

.breadcrumb-item:not(:last-child)::after {
    content: "/";
    margin-left: 8px;
    color: var(--text-muted);
}

.controls {
    display: flex;
    gap: 8px;
}

.control-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
    font-size: 14px;
    transition: var(--transition);
}

.control-btn:hover {
    background: var(--bg-tertiary);
}

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

.line-numbers {
    width: 50px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    font-size: 13px;
    color: var(--text-muted);
    text-align: right;
    padding: 16px 12px 0 0;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    user-select: none;
    transition: background var(--transition), border var(--transition);
}

.line-numbers div {
    height: 24px;
}

textarea {
    flex: 1;
    border: none;
    outline: none;
    padding: 16px 20px;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 15px;
    line-height: 24px;
    color: var(--text-primary);
    background: transparent;
    resize: none;
    white-space: pre;
    tab-size: 4;
}

/* Status Bar */
.statusbar {
    height: var(--footer-height);
    border-top: 1px solid var(--border-color);
    font-size: 12px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: 0 16px;
    background: var(--bg-secondary);
    color: var(--text-muted);
    transition: background var(--transition), border var(--transition);
}

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

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 10px;
}

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

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.4);
    display: none;
    align-items: flex-start;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
    transition: var(--transition);
}

.modal-overlay.active {
    display: flex;
}

.modal-container {
    width: 500px;
    background: var(--bg-primary);
    margin-top: 60px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    padding: 20px;
    animation: slideDown 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideDown {
    from {
        transform: translateY(-20px);
        opacity: 0;
    }

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

.modal-title {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-secondary);
}

.modal-input {
    width: 100%;
    padding: 12px 16px;
    font-size: 15px;
    border-radius: 8px;
    border: 1px solid var(--accent-color);
    background: var(--bg-primary);
    color: var(--text-primary);
    outline: none;
    font-family: inherit;
}

.modal-actions {
    margin-top: 12px;
    display: flex;
    justify-content: flex-end;
}

.secondary-toolbar {
    padding: 0 16px 12px;
    gap: 8px;
    justify-content: flex-start;
}

.btn-small {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

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

/* Modals */
.modal-message {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.5;
}

.modal-buttons {
    display: flex;
    gap: 10px;
    width: 100%;
}

.modal-btn {
    flex: 1;
    padding: 10px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    cursor: pointer;
    font-weight: 600;
    font-size: 14px;
    transition: var(--transition);
}

.modal-btn.primary {
    background: #ef4444;
    color: white;
    border: none;
}

.modal-btn.primary:hover {
    background: #dc2626;
}

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

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


.file-item.dragging {
    opacity: 0.5;
    background: var(--bg-tertiary);
}

.file-item.drag-over {
    background: var(--selection);
    outline: 2px dashed var(--accent-color);
    outline-offset: -2px;
}

/* Context Menu */

.context-menu {
    position: fixed;
    min-width: 160px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    padding: 6px 0;
    z-index: 2000;
}

.context-menu-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    font-size: 13px;
    color: var(--text-primary);
    cursor: pointer;
    transition: background 0.1s;
}

.context-menu-item:hover {
    background: var(--selection);
    color: var(--accent-color);
}

.context-menu-item i {
    opacity: 0.7;
}

.hidden {
    display: none !important;
}



/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(5px);
    }

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


.file-item {
    animation: fadeIn 0.3s ease forwards;
}