/* ===== 3D ROOM PLANNER PRO STYLES ===== */

/* === ROOT VARIABLES === */
:root {
    /* Colors */
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-200: #bfdbfe;
    --primary-300: #93c5fd;
    --primary-400: #60a5fa;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    --primary-800: #1e40af;
    --primary-900: #1e3a8a;

    --secondary-50: #faf5ff;
    --secondary-100: #f3e8ff;
    --secondary-200: #e9d5ff;
    --secondary-300: #d8b4fe;
    --secondary-400: #c084fc;
    --secondary-500: #a855f7;
    --secondary-600: #9333ea;
    --secondary-700: #7c3aed;
    --secondary-800: #6b21a8;
    --secondary-900: #581c87;

    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    --success-500: #10b981;
    --warning-500: #f59e0b;
    --error-500: #ef4444;

    /* Glass morphism */
    --glass-bg: rgba(255, 255, 255, 0.25);
    --glass-border: rgba(255, 255, 255, 0.18);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-base: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 500ms ease;

    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-base: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Spacing */
    --space-px: 1px;
    --space-0: 0;
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-attachment: fixed;
    color: var(--gray-800);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* === LOADING SCREEN === */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: linear-gradient(135deg, var(--primary-600), var(--secondary-600));
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    transition: all var(--transition-slow);
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
    transform: scale(1.1);
}

.loading-content {
    text-align: center;
    color: white;
    max-width: 400px;
    padding: var(--space-8);
}

.loading-content h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-6);
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top: 4px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--space-6);
}

.loading-progress {
    margin-top: var(--space-6);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--space-3);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #fff, rgba(255, 255, 255, 0.8));
    border-radius: var(--radius-full);
    transition: width var(--transition-base);
    animation: progressShimmer 1.5s ease-in-out infinite;
}

#loading-text {
    font-size: 0.875rem;
    opacity: 0.9;
}

/* === GLASS UTILITY CLASS === */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

/* === BUTTONS === */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    border: none;
    border-radius: var(--radius-base);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    user-select: none;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    color: white;
    box-shadow: var(--shadow-base);
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--primary-700), var(--primary-800));
    box-shadow: var(--shadow-lg);
    transform: translateY(-1px);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--gray-600), var(--gray-700));
    color: white;
    box-shadow: var(--shadow-base);
}

.btn-secondary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--gray-700), var(--gray-800));
    box-shadow: var(--shadow-lg);
    transform: translateY(-1px);
}

.btn-ghost {
    background: var(--glass-bg);
    color: var(--gray-700);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(16px);
}

.btn-ghost:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.4);
    transform: translateY(-1px);
}

.btn-danger {
    background: linear-gradient(135deg, var(--error-500), #dc2626);
    color: white;
}

.btn-danger:hover:not(:disabled) {
    background: linear-gradient(135deg, #dc2626, #b91c1c);
    transform: translateY(-1px);
}

.btn-sm {
    padding: var(--space-2) var(--space-3);
    font-size: 0.75rem;
}

.btn-full {
    width: 100%;
    justify-content: center;
}

/* === HEADER === */
.app-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: var(--space-4) 0;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    flex-wrap: wrap;
}

.app-title {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.app-title i {
    font-size: 2rem;
    background: linear-gradient(135deg, var(--primary-600), var(--secondary-600));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.app-title h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-800);
    margin: 0;
}

.version-badge {
    background: linear-gradient(135deg, var(--warning-500), #f97316);
    color: white;
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
}

.header-stats {
    display: flex;
    gap: var(--space-4);
}

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

.stat-value {
    display: block;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-800);
}

.stat-label {
    display: block;
    font-size: 0.75rem;
    color: var(--gray-600);
    margin-top: var(--space-1);
}

.header-actions {
    display: flex;
    gap: var(--space-3);
    align-items: center;
}

/* === MAIN LAYOUT === */
.app-main {
    display: flex;
    min-height: calc(100vh - 100px);
    gap: var(--space-4);
    padding: var(--space-4);
    max-width: 1400px;
    margin: 0 auto;
}

/* === TOOLS PANEL === */
.tools-panel {
    width: 350px;
    min-width: 350px;
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: transform var(--transition-base);
    height: fit-content;
    max-height: calc(100vh - 140px);
    overflow-y: auto;
}

.tools-panel.collapsed {
    transform: translateX(-320px);
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-5);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--glass-border);
}

.panel-header h3 {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin: 0;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-800);
}

.panel-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-base);
    color: var(--gray-600);
    transition: all var(--transition-fast);
}

.panel-toggle:hover {
    background: var(--gray-100);
    color: var(--gray-800);
}

.tools-panel.collapsed .panel-toggle i {
    transform: rotate(180deg);
}

.panel-content {
    padding: var(--space-5);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(16px);
}

/* === TOOL GROUPS === */
.tool-group {
    margin-bottom: var(--space-8);
    padding-bottom: var(--space-6);
    border-bottom: 1px solid var(--gray-200);
}

.tool-group:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.tool-group h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--space-4);
    color: var(--gray-800);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.tool-group h4 i {
    color: var(--primary-600);
}

/* === ROOM TEMPLATES === */
.template-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
}

.template-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-4);
    background: var(--gray-50);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
}

.template-btn:hover {
    background: var(--primary-50);
    border-color: var(--primary-300);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.template-btn i {
    font-size: 1.5rem;
    color: var(--primary-600);
}

.template-btn span {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
}

/* === INPUT GROUPS === */
.input-group {
    margin-bottom: var(--space-4);
}

.input-group label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--space-2);
    color: var(--gray-700);
    font-size: 0.875rem;
}

.input-group input,
.input-group select {
    width: 100%;
    padding: var(--space-3);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-base);
    background: white;
    color: var(--gray-800);
    font-size: 0.875rem;
    transition: all var(--transition-fast);
}

.input-group input:focus,
.input-group select:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* === MATERIAL CATEGORIES === */
.material-category {
    margin-bottom: var(--space-3);
}

.material-category label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--space-2);
    color: var(--gray-700);
    font-size: 0.875rem;
}

/* === FURNITURE LIBRARY === */
.furniture-search {
    position: relative;
    margin-bottom: var(--space-4);
}

.furniture-search input {
    width: 100%;
    padding: var(--space-3) var(--space-10) var(--space-3) var(--space-3);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-base);
    background: white;
    font-size: 0.875rem;
}

.search-btn {
    position: absolute;
    right: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--gray-500);
    cursor: pointer;
}

.furniture-categories {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.category-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-3);
    background: var(--gray-50);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-base);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.75rem;
    color: var(--gray-600);
}

.category-btn:hover {
    background: var(--gray-100);
    border-color: var(--gray-300);
}

.category-btn.active {
    background: var(--primary-100);
    border-color: var(--primary-500);
    color: var(--primary-700);
}

.category-btn i {
    font-size: 1.25rem;
}

.furniture-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
    max-height: 300px;
    overflow-y: auto;
}

.furniture-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3);
    background: white;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    cursor: grab;
    transition: all var(--transition-fast);
    user-select: none;
}

.furniture-item:hover {
    border-color: var(--primary-300);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.furniture-item:active {
    cursor: grabbing;
}

.furniture-item.dragging {
    opacity: 0.7;
    transform: scale(0.9) rotate(5deg);
    z-index: 1000;
}

.furniture-icon {
    width: 40px;
    height: 40px;
    background: var(--primary-100);
    border-radius: var(--radius-base);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-600);
    font-size: 1.25rem;
}

.furniture-name {
    font-size: 0.75rem;
    font-weight: 600;
    text-align: center;
    color: var(--gray-800);
}

.furniture-dimensions {
    font-size: 0.625rem;
    color: var(--gray-500);
    text-align: center;
}

/* === LIGHTING CONTROLS === */
.lighting-preset,
.slider-input {
    margin-bottom: var(--space-4);
}

.slider-input label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-2);
}

.slider-value {
    font-weight: 600;
    color: var(--primary-600);
    font-size: 0.875rem;
}

input[type="range"] {
    width: 100%;
    height: 6px;
    border-radius: var(--radius-full);
    background: var(--gray-200);
    outline: none;
    cursor: pointer;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-600);
    cursor: pointer;
    box-shadow: var(--shadow-base);
    transition: all var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--primary-700);
    transform: scale(1.1);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-600);
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-base);
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--gray-700);
}

.checkbox-label input[type="checkbox"] {
    width: auto;
    margin: 0;
    accent-color: var(--primary-600);
}

/* === VIEWER CONTAINER === */
.viewer-container {
    flex: 1;
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    background: var(--gray-100);
    min-height: 600px;
}

.room-viewer {
    width: 100%;
    height: 100%;
    position: relative;
}

.room-viewer canvas {
    display: block;
    width: 100%;
    height: 100%;
    border-radius: var(--radius-xl);
}

/* === VIEWPORT CONTROLS === */
.viewport-controls {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    z-index: 100;
}

.view-buttons {
    display: flex;
    gap: var(--space-2);
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--space-2);
}

.view-btn {
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    border-radius: var(--radius-base);
    color: var(--gray-600);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.view-btn:hover {
    background: rgba(255, 255, 255, 0.5);
    color: var(--gray-800);
}

.view-btn.active {
    background: var(--primary-600);
    color: white;
    box-shadow: var(--shadow-base);
}

.render-mode select {
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-base);
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    color: var(--gray-800);
    font-size: 0.875rem;
}

.viewport-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--space-3);
}

/* === OBJECT INSPECTOR === */
.object-inspector {
    position: absolute;
    bottom: var(--space-4);
    right: var(--space-4);
    width: 300px;
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-base);
    z-index: 200;
}

.object-inspector.hidden {
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
}

.inspector-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--glass-border);
}

.inspector-header h4 {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-800);
}

.inspector-close {
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-base);
    color: var(--gray-500);
    transition: all var(--transition-fast);
}

.inspector-close:hover {
    background: var(--gray-100);
    color: var(--gray-800);
}

.inspector-content {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(16px);
}

.inspector-tabs {
    display: flex;
    border-bottom: 1px solid var(--gray-200);
}

.tab-btn {
    flex: 1;
    padding: var(--space-3);
    background: none;
    border: none;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-600);
    cursor: pointer;
    transition: all var(--transition-fast);
    border-bottom: 2px solid transparent;
}

.tab-btn:hover {
    color: var(--gray-800);
    background: var(--gray-50);
}

.tab-btn.active {
    color: var(--primary-600);
    border-bottom-color: var(--primary-600);
    background: var(--primary-50);
}

.tab-content {
    display: none;
    padding: var(--space-4);
}

.tab-content.active {
    display: block;
}

.property-group {
    margin-bottom: var(--space-4);
}

.property-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: var(--space-2);
}

.property-group input,
.property-group select {
    width: 100%;
    padding: var(--space-2) var(--space-3);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-base);
    background: white;
    font-size: 0.875rem;
}

.inspector-actions {
    display: flex;
    gap: var(--space-2);
    padding: var(--space-4);
    border-top: 1px solid var(--gray-200);
    background: rgba(255, 255, 255, 0.95);
}

.info-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--space-2);
    font-size: 0.875rem;
}

.info-label {
    color: var(--gray-600);
}

.info-value {
    font-weight: 600;
    color: var(--gray-800);
}

/* === VIEWER TOOLS === */
.viewer-tools {
    position: absolute;
    bottom: var(--space-4);
    left: var(--space-4);
    display: flex;
    gap: var(--space-2);
    z-index: 100;
}

.tool-btn {
    width: 48px;
    height: 48px;
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    color: var(--gray-700);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.125rem;
}

.tool-btn:hover:not(:disabled) {
    background: var(--primary-600);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.tool-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* === MINIMAP === */
.minimap {
    position: absolute;
    top: var(--space-4);
    left: var(--space-4);
    width: 200px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    z-index: 100;
}

.minimap-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--glass-border);
}

.minimap-header h5 {
    margin: 0;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-800);
}

.minimap-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-1);
    border-radius: var(--radius-base);
    color: var(--gray-600);
    transition: all var(--transition-fast);
}

.minimap-toggle:hover {
    background: var(--gray-100);
    color: var(--gray-800);
}

.minimap-content {
    padding: var(--space-3);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(16px);
}

#minimap-canvas {
    border-radius: var(--radius-base);
    border: 1px solid var(--gray-200);
}

/* === PROGRESS INDICATOR === */
.progress-indicator {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    z-index: 1000;
    text-align: center;
}

.progress-indicator.hidden {
    display: none;
}

.progress-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
}

.progress-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--gray-200);
    border-top: 3px solid var(--primary-600);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* === MODALS === */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.modal:not(.hidden) {
    opacity: 1;
    visibility: visible;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-2xl);
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow: hidden;
    transform: scale(0.95);
    transition: transform var(--transition-base);
}

.modal:not(.hidden) .modal-content {
    transform: scale(1);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-6);
    border-bottom: 1px solid var(--gray-200);
    background: var(--gray-50);
}

.modal-header h3 {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-800);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--gray-500);
    transition: color var(--transition-fast);
    padding: var(--space-2);
    border-radius: var(--radius-base);
}

.modal-close:hover {
    color: var(--gray-800);
    background: var(--gray-200);
}

.modal-body {
    padding: var(--space-6);
    max-height: 60vh;
    overflow-y: auto;
}

/* === EXPORT OPTIONS === */
.export-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.export-option .btn {
    width: 100%;
    justify-content: center;
    padding: var(--space-4);
    font-size: 1rem;
}

/* === DRAG AND DROP === */
.viewer-container.drag-over {
    background: rgba(59, 130, 246, 0.05);
    border: 2px dashed var(--primary-400);
}

.furniture-item.dragging {
    opacity: 0.7;
    transform: scale(0.9) rotate(5deg);
    z-index: 1000;
    pointer-events: none;
}

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

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* === ANIMATIONS === */
@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes progressShimmer {
    0% { opacity: 0.6; }
    50% { opacity: 1; }
    100% { opacity: 0.6; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* === RESPONSIVE DESIGN === */
@media (max-width: 1200px) {
    .tools-panel {
        width: 320px;
        min-width: 320px;
    }
    
    .header-stats {
        gap: var(--space-3);
    }
    
    .furniture-categories,
    .template-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 1024px) {
    .app-main {
        flex-direction: column;
        gap: var(--space-3);
    }
    
    .tools-panel {
        width: 100%;
        max-height: 400px;
        order: 2;
    }
    
    .tools-panel.collapsed {
        transform: translateY(350px);
    }
    
    .viewer-container {
        order: 1;
        min-height: 500px;
    }
    
    .object-inspector {
        position: relative;
        bottom: auto;
        right: auto;
        width: 100%;
        margin-top: var(--space-4);
    }
    
    .minimap {
        position: relative;
        top: auto;
        left: auto;
        width: 100%;
        margin-bottom: var(--space-4);
    }
    
    .viewer-tools {
        position: relative;
        bottom: auto;
        left: auto;
        justify-content: center;
        margin-top: var(--space-4);
    }
    
    .viewport-controls {
        position: relative;
        top: auto;
        right: auto;
        flex-direction: row;
        justify-content: center;
        margin-bottom: var(--space-4);
    }
}

@media (max-width: 768px) {
    .app-main {
        padding: var(--space-3);
    }
    
    .header-content {
        flex-direction: column;
        text-align: center;
        gap: var(--space-3);
    }
    
    .app-title h1 {
        font-size: 1.25rem;
    }
    
    .header-stats {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .header-actions {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .panel-content {
        padding: var(--space-4);
    }
    
    .tool-group {
        margin-bottom: var(--space-6);
    }
    
    .furniture-grid {
        grid-template-columns: 1fr;
    }
    
    .template-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .view-buttons {
        flex-wrap: wrap;
    }
    
    .modal-content {
        margin: var(--space-4);
        width: calc(100% - 2rem);
    }
    
    .modal-body {
        padding: var(--space-4);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-3);
    }
    
    .app-main {
        padding: var(--space-2);
    }
    
    .tools-panel {
        max-height: 300px;
    }
    
    .panel-content {
        padding: var(--space-3);
    }
    
    .furniture-categories {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-1);
    }
    
    .category-btn {
        padding: var(--space-2);
        font-size: 0.625rem;
    }
    
    .template-grid {
        grid-template-columns: 1fr;
    }
    
    .header-stats {
        gap: var(--space-2);
    }
    
    .stat-value {
        font-size: 1rem;
    }
    
    .stat-label {
        font-size: 0.625rem;
    }
    
    .viewer-tools {
        flex-wrap: wrap;
    }
    
    .tool-btn {
        width: 44px;
        height: 44px;
    }
}

/* === ACCESSIBILITY === */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

@media (prefers-color-scheme: dark) {
    :root {
        --gray-50: #111827;
        --gray-100: #1f2937;
        --gray-200: #374151;
        --gray-300: #4b5563;
        --gray-400: #6b7280;
        --gray-500: #9ca3af;
        --gray-600: #d1d5db;
        --gray-700: #e5e7eb;
        --gray-800: #f3f4f6;
        --gray-900: #f9fafb;
    }
    
    body {
        background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
        color: var(--gray-300);
    }
    
    .glass {
        background: rgba(0, 0, 0, 0.25);
        border: 1px solid rgba(255, 255, 255, 0.1);
    }
}

/* Focus styles for accessibility */
button:focus-visible,
input:focus-visible,
select:focus-visible {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .tools-panel,
    .viewer-tools,
    .viewport-controls,
    .app-header,
    .object-inspector,
    .minimap {
        display: none !important;
    }
    
    .viewer-container {
        width: 100%;
        height: 100vh;
        position: static;
        border-radius: 0;
    }
    
    .app-main {
        flex-direction: column;
        padding: 0;
    }
}