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

:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #14141c;
    --bg-tertiary: #1e1e2a;
    --border-color: #2a2a35;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --accent-primary: #4a90e2;
    --accent-success: #52c41a;
    --accent-warning: #fa8c16;
    --accent-danger: #f5222d;
    --grid-color: rgba(74, 144, 226, 0.2);
}

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

.app-container {
    height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Toolbar */
.toolbar {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}

.toolbar-left .logo {
    font-size: 1.2rem;
    font-weight: 600;
}

.toolbar-left .logo i {
    color: var(--accent-primary);
    margin-right: 10px;
}

.toolbar-center {
    display: flex;
    gap: 12px;
    align-items: center;
}

.toolbar-right {
    display: flex;
    align-items: center;
}

/* Buttons */
.btn {
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn i {
    font-size: 16px;
}

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

.btn-primary:hover {
    background: #357abd;
    transform: translateY(-1px);
}

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

.btn-success:hover {
    background: #3c9c1c;
}

.btn-info {
    background: #13c2c2;
    color: white;
}

.btn-info:hover {
    background: #0ea5a5;
}

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

.btn-warning:hover {
    background: #d46b00;
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: #2a2a35;
}

.btn-icon {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 6px;
    border-radius: 4px;
    transition: all 0.3s;
}

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

/* Dropdown */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    min-width: 200px;
    z-index: 1000;
    margin-top: 4px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.dropdown-content button {
    width: 100%;
    padding: 10px 16px;
    text-align: left;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: background 0.2s;
}

.dropdown-content button:hover {
    background: var(--bg-tertiary);
}

.dropdown:hover .dropdown-content {
    display: block;
}

/* Zoom controls */
.zoom-controls {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-tertiary);
    padding: 4px 12px;
    border-radius: 6px;
}

.zoom-controls button {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
}

.zoom-controls button:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

#zoomLevel {
    min-width: 50px;
    text-align: center;
    font-size: 12px;
}

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

/* Sidebar */
.sidebar {
    width: 280px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-header {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar-header h3 {
    font-size: 16px;
    font-weight: 600;
}

.elements-list {
    flex: 1;
    overflow-y: auto;
    padding: 12px;
}

.element-item {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 12px;
    margin-bottom: 8px;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
}

.element-item:hover {
    background: #2a2a35;
    transform: translateX(2px);
}

.element-item.selected {
    border-color: var(--accent-primary);
    background: #1e2a3a;
}

.element-item-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.element-type {
    font-weight: 600;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.element-actions {
    display: flex;
    gap: 6px;
}

.element-actions button {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
}

.element-actions button:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.element-info {
    font-size: 12px;
    color: var(--text-secondary);
}

.element-info p {
    margin: 4px 0;
}

/* Canvas container */
.canvas-container {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #1a1a1a;
    overflow: auto;
    padding: 20px;
}

.canvas-wrapper {
    position: relative;
    background: #000;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
    transition: transform 0.3s;
}

#mainCanvas {
    display: block;
    width: 100%;
    height: auto;
    cursor: crosshair;
}

.canvas-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

/* Properties panel */
.properties-panel {
    width: 320px;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: transform 0.3s;
}

.properties-panel.hidden {
    transform: translateX(100%);
}

.properties-header {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.properties-header h3 {
    font-size: 16px;
    font-weight: 600;
}

.properties-content {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
}

.property-group {
    margin-bottom: 20px;
}

.property-group label {
    display: block;
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.property-group input,
.property-group select,
.property-group textarea {
    width: 100%;
    padding: 8px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 14px;
}

.property-group input:focus,
.property-group select:focus,
.property-group textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.color-preview {
    width: 40px;
    height: 40px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
}

.empty-state {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
}

.modal-content {
    background: var(--bg-secondary);
    margin: 10% auto;
    padding: 20px;
    border-radius: 8px;
    width: 400px;
    text-align: center;
    position: relative;
}

.modal-content .close {
    position: absolute;
    right: 20px;
    top: 20px;
    font-size: 28px;
    cursor: pointer;
    color: var(--text-secondary);
}

#qrCodeContainer {
    margin: 20px 0;
    display: flex;
    justify-content: center;
}

/* Grid */
.canvas-grid {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    background-image: 
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
    background-size: 20px 20px;
}

/* Selection and resize handles */
.resize-handle {
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--accent-primary);
    border: 1px solid white;
    pointer-events: auto;
}

.resize-handle.nw { top: -4px; left: -4px; cursor: nw-resize; }
.resize-handle.n { top: -4px; left: 50%; transform: translateX(-50%); cursor: n-resize; }
.resize-handle.ne { top: -4px; right: -4px; cursor: ne-resize; }
.resize-handle.e { top: 50%; right: -4px; transform: translateY(-50%); cursor: e-resize; }
.resize-handle.se { bottom: -4px; right: -4px; cursor: se-resize; }
.resize-handle.s { bottom: -4px; left: 50%; transform: translateX(-50%); cursor: s-resize; }
.resize-handle.sw { bottom: -4px; left: -4px; cursor: sw-resize; }
.resize-handle.w { top: 50%; left: -4px; transform: translateY(-50%); cursor: w-resize; }

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

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

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

::-webkit-scrollbar-thumb:hover {
    background: #3a3a45;
}

/* Responsive */
@media (max-width: 1200px) {
    .sidebar,
    .properties-panel {
        width: 260px;
    }
}

@media (max-width: 768px) {
    .toolbar-center {
        gap: 6px;
    }
    
    .btn span {
        display: none;
    }
    
    .sidebar,
    .properties-panel {
        width: 200px;
    }
}