:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #64748b;
    --danger: #ef4444;
    --success: #10b981;
    --warning: #f59e0b;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --border: #e2e8f0;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
}

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

/* Header moderne */
header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 1.5rem;
    box-shadow: var(--shadow);
}

h1 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

/* Toolbar améliorée */
.toolbar {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.tool-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.tool-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.tool-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.tool-btn svg {
    width: 20px;
    height: 20px;
}

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

/* Sidebar moderne */
.sidebar {
    width: 320px;
    background: var(--bg-primary);
    border-right: 1px solid var(--border);
    overflow-y: auto;
    box-shadow: var(--shadow);
}

.panel {
    display: none;
    padding: 1.5rem;
}

.panel.active {
    display: block;
}

.panel h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

/* Quick actions */
.quick-actions {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.shape-btn {
    flex: 1;
    padding: 0.75rem;
    background: var(--bg-secondary);
    border: 2px solid var(--border);
    border-radius: 6px;
    font-size: 1.5rem;
    cursor: pointer;
    transition: all 0.2s;
}

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

.shape-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* Input controls */
.input-controls {
    margin-bottom: 1.5rem;
}

.input-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.input-row label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.quick-input {
    flex: 1;
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 0.875rem;
}

.quick-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.btn-add {
    padding: 0.5rem 1rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 4px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}

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

/* Option groups */
.option-group {
    margin-bottom: 1.5rem;
}

.option-group h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

/* Toggle switches */
.toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.toggle input {
    display: none;
}

.toggle-slider {
    position: relative;
    width: 42px;
    height: 24px;
    background: var(--bg-tertiary);
    border-radius: 12px;
    transition: background 0.2s;
}

.toggle-slider::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    transition: transform 0.2s;
    box-shadow: var(--shadow);
}

.toggle input:checked + .toggle-slider {
    background: var(--primary);
}

.toggle input:checked + .toggle-slider::after {
    transform: translateX(18px);
}

/* Action buttons */
.action-buttons {
    display: flex;
    gap: 0.5rem;
    margin-top: 1.5rem;
}

.btn-action {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

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

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

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

/* Stats display */
.draw-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

.stat-item {
    text-align: center;
}

.stat-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.stat-value {
    display: block;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Canvas moderne */
.canvas-container {
    flex: 1;
    position: relative;
    background: var(--bg-tertiary);
    overflow: hidden;
}

#facade-canvas {
    background: white;
    box-shadow: inset 0 0 0 1px var(--border);
}

/* Canvas tools */
.canvas-tools {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--bg-primary);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    padding: 0.5rem;
}

.tool-group {
    display: flex;
    gap: 0.25rem;
}

.zoom-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-secondary);
}

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

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

/* Status bar */
.canvas-status {
    position: absolute;
    bottom: 1rem;
    left: 1rem;
    right: 1rem;
    background: var(--bg-primary);
    border-radius: 6px;
    box-shadow: var(--shadow-lg);
    padding: 0.75rem 1rem;
    display: flex;
    gap: 2rem;
    font-size: 0.875rem;
}

.status-item {
    color: var(--text-secondary);
}

/* Visual feedback */
.point-marker {
    position: absolute;
    width: 10px;
    height: 10px;
    background-color: #e74c3c;
    border: 2px solid white;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
    z-index: 10;
}

.dimension-label {
    position: absolute;
    background-color: rgba(255, 255, 255, 0.9);
    padding: 2px 6px;
    font-size: 12px;
    border-radius: 3px;
    pointer-events: none;
    z-index: 5;
}

/* Highlight effect */
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

.highlight {
    animation: pulse 0.5s ease-in-out;
}

/* Floating input for direct entry */
.floating-input {
    position: absolute;
    background-color: rgba(255, 255, 255, 0.95);
    border: 2px solid #3498db;
    border-radius: 6px;
    padding: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    z-index: 1000;
    pointer-events: all;
}

.floating-input .input-group {
    display: flex;
    align-items: center;
    margin-bottom: 4px;
}

.floating-input label {
    font-weight: bold;
    color: #2c3e50;
    width: 20px;
    margin: 0;
}

.floating-input .direct-input {
    width: 80px;
    padding: 4px 6px;
    border: 1px solid #ddd;
    border-radius: 3px;
    font-size: 14px;
    margin: 0 4px;
}

.floating-input .direct-input:focus {
    outline: none;
    border-color: #3498db;
    background-color: #f0f8ff;
}

.floating-input .unit {
    font-size: 12px;
    color: #666;
}

.floating-input .input-hint {
    text-align: center;
    font-size: 11px;
    color: #888;
    margin-top: 4px;
    padding-top: 4px;
    border-top: 1px solid #eee;
}

/* Active input highlight */
.input-group.active .direct-input {
    background-color: #e3f2fd;
    border-color: #1976d2;
}

/* Direct input indicator in canvas info */
#current-info {
    font-weight: bold;
    color: #2c3e50;
}

/* Selected items */
.bac-item.selected, .accessoire-item.selected {
    background-color: #3498db;
    color: white;
    transform: scale(1.05);
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

/* Canvas drawing helpers */
.canvas-container.drawing {
    cursor: crosshair;
}

/* Smooth transitions */
#facade-canvas {
    transition: none; /* Disable transitions for smooth drawing */
}

/* Responsive pour tablettes */
@media (max-width: 768px) {
    .sidebar {
        width: 250px;
    }
    
    .tool-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.875rem;
    }
}

@media (max-width: 600px) {
    .main-content {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        height: 200px;
        order: 2;
    }
    
    .canvas-container {
        order: 1;
        height: calc(100vh - 300px);
    }
}

/* Snap indicators */
.snap-indicator {
    position: absolute;
    pointer-events: none;
    z-index: 100;
}

.snap-indicator.midpoint {
    width: 12px;
    height: 12px;
    border: 2px solid #e74c3c;
    background-color: rgba(231, 76, 60, 0.2);
    transform: translate(-50%, -50%) rotate(45deg);
}

.snap-indicator.vertex {
    width: 12px;
    height: 12px;
    border: 2px solid #e74c3c;
    border-radius: 50%;
    background-color: rgba(231, 76, 60, 0.2);
    transform: translate(-50%, -50%);
}

.snap-indicator.perpendicular::before,
.snap-indicator.perpendicular::after {
    content: '';
    position: absolute;
    background-color: #e74c3c;
}

.snap-indicator.perpendicular::before {
    width: 12px;
    height: 2px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.snap-indicator.perpendicular::after {
    width: 2px;
    height: 12px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* Segments editor */
.segments-editor {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

.segments-editor h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.segments-list {
    max-height: 300px;
    overflow-y: auto;
    padding-right: 0.25rem;
}

.segment-item {
    display: flex;
    align-items: center;
    padding: 0.5rem;
    margin-bottom: 0.25rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}

.segment-item:hover {
    background: var(--bg-tertiary);
    border-color: var(--primary);
    transform: translateX(2px);
}

.segment-item.selected {
    background: #e0e7ff;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}

.segment-number {
    width: 28px;
    height: 28px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    font-weight: 600;
    margin-right: 0.75rem;
    flex-shrink: 0;
}

.segment-item.selected .segment-number {
    background: var(--primary-dark);
}

/* Edit popup */
.edit-popup {
    position: absolute;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    min-width: 280px;
}

.popup-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
    font-weight: 600;
}

.popup-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
}

.popup-close:hover {
    background: var(--bg-secondary);
}

.popup-content {
    padding: 1rem;
}

.popup-row {
    display: flex;
    align-items: center;
    margin-bottom: 0.75rem;
}

.popup-row label {
    width: 80px;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.popup-input {
    flex: 1;
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 0.875rem;
}

.popup-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.popup-input.error {
    border-color: var(--danger);
    background-color: #fee;
}

.popup-input.error:focus {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.popup-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.popup-actions button {
    flex: 1;
    padding: 0.5rem;
    border: none;
    border-radius: 4px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

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

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

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

.btn-danger:hover {
    background: #dc2626;
}

/* Notifications */
.error-notification,
.success-notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 1rem 1.5rem;
    border-radius: 6px;
    box-shadow: var(--shadow-lg);
    font-size: 0.875rem;
    font-weight: 500;
    animation: slideIn 0.3s ease-out;
    z-index: 9999;
}

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

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

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Error screen */
.error-screen {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    font-size: 1.25rem;
    color: var(--danger);
    text-align: center;
    padding: 2rem;
}

/* Loading state */
.canvas-container.loading {
    position: relative;
}

.canvas-container.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 40px;
    height: 40px;
    margin: -20px 0 0 -20px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Performance mode indicator */
.performance-mode {
    position: fixed;
    bottom: 20px;
    left: 20px;
    padding: 0.5rem 1rem;
    background: var(--warning);
    color: white;
    border-radius: 4px;
    font-size: 0.75rem;
    opacity: 0.8;
}

/* ...existing code... */