/**
 * Modern 360° Viewer CSS Framework
 * CSS Grid + Flexbox + Custom Properties
 */

:root {
    /* Color System */
    --primary-color: #007bff;
    --primary-dark: #0056b3;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --info-color: #17a2b8;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #ffffff;
    --bg-dark: #ffffff;
    --bg-overlay: rgba(0, 0, 0, 0.8);
    
    /* Text Colors */
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-light: #ffffff;
    --text-muted: #adb5bd;
    
    /* Spacing Scale */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-xxl: 3rem;
    
    /* Typography */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-xxl: 1.5rem;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-bold: 700;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 50%;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Z-index scale */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* Reset and Base Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    line-height: 1.5;
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    /* High-DPI display optimization */
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--text-primary);
    background-color: #ffffff !important;
    line-height: 1.6;
    margin: 0;
    padding: 0;
}

/* Modern Layout System */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.grid {
    display: grid;
    gap: var(--space-md);
}

.grid-auto {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.flex-wrap {
    flex-wrap: wrap;
}

.items-center {
    align-items: center;
}

.items-start {
    align-items: flex-start;
}

.items-end {
    align-items: flex-end;
}

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.justify-around {
    justify-content: space-around;
}

.justify-evenly {
    justify-content: space-evenly;
}

/* Modern 360 Viewer Styles */
.viewer-wrapper {
    position: relative;
    width: 100%;
    height: 100vh;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.viewer-main {
    position: relative;
    width: 90%;
    max-width: 800px;
    height: 80vh;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

.viewer-header {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.8) 0%, transparent 100%);
    padding: var(--space-lg);
    color: var(--text-light);
    z-index: var(--z-fixed);
}

.viewer-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-xs);
}

.viewer-subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.viewer-footer {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(0deg, rgba(0, 0, 0, 0.8) 0%, transparent 100%);
    padding: var(--space-lg);
    z-index: var(--z-fixed);
}

/* Control Components */
.controls-panel {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    background: var(--bg-overlay);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-xl);
    padding: var(--space-md) var(--space-lg);
}

.control-button {
    background: transparent;
    border: 2px solid transparent;
    color: var(--text-light);
    font-size: var(--font-size-lg);
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.control-button:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.3);
    transform: scale(1.05);
}

.control-button:active {
    transform: scale(0.95);
}

.control-button.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

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

/* Progress Bar */
.progress-container {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    min-width: 200px;
}

.progress-bar {
    flex: 1;
    height: 6px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-sm);
    overflow: hidden;
    cursor: pointer;
    position: relative;
}

.progress-bar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(255, 255, 255, 0.1) 50%, 
        transparent 100%);
    animation: shimmer 2s infinite;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-dark));
    border-radius: var(--radius-sm);
    transition: width var(--transition-normal);
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 4px;
    height: 100%;
    background: rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-sm);
}

.progress-text {
    color: var(--text-light);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    min-width: 60px;
    text-align: center;
    font-variant-numeric: tabular-nums;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(200%); }
}

/* Loading States */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-overlay);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    z-index: var(--z-modal);
    backdrop-filter: blur(10px);
}

.spinner {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top: 3px solid var(--primary-color);
    border-radius: var(--radius-full);
    animation: spin 1s linear infinite;
    margin-bottom: var(--space-lg);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-text {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--space-md);
}

.loading-progress {
    font-size: var(--font-size-base);
    color: var(--primary-color);
    font-weight: var(--font-weight-bold);
}

/* Responsive Design */
@media (max-width: 768px) {
    .viewer-wrapper {
        height: 100vh;
        padding: 0;
    }
    
    .viewer-main {
        width: 100%;
        height: 100%;
        border-radius: 0;
    }
    
    .viewer-header,
    .viewer-footer {
        padding: var(--space-md);
    }
    
    .controls-panel {
        gap: var(--space-sm);
        padding: var(--space-sm) var(--space-md);
    }
    
    .control-button {
        width: 40px;
        height: 40px;
        font-size: var(--font-size-base);
    }
    
    .progress-container {
        min-width: 150px;
    }
}

@media (max-width: 480px) {
    .viewer-header,
    .viewer-footer {
        padding: var(--space-sm);
    }
    
    .viewer-title {
        font-size: var(--font-size-lg);
    }
    
    .controls-panel {
        gap: var(--space-xs);
        padding: var(--space-xs) var(--space-sm);
    }
    
    .control-button {
        width: 36px;
        height: 36px;
        font-size: var(--font-size-sm);
    }
    
    .progress-container {
        min-width: 120px;
    }
}

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

.invisible {
    visibility: hidden !important;
}

.opacity-0 {
    opacity: 0 !important;
}

.opacity-50 {
    opacity: 0.5 !important;
}

.opacity-100 {
    opacity: 1 !important;
}

.pointer-events-none {
    pointer-events: none !important;
}

.cursor-pointer {
    cursor: pointer !important;
}

.cursor-grab {
    cursor: grab !important;
}

.cursor-grabbing {
    cursor: grabbing !important;
}

.select-none {
    user-select: none !important;
}

/* Animation Utilities */
.fade-in {
    animation: fadeIn var(--transition-normal) ease;
}

.fade-out {
    animation: fadeOut var(--transition-normal) ease;
}

.slide-in-right {
    animation: slideInRight var(--transition-normal) ease;
}

.slide-out-right {
    animation: slideOutRight var(--transition-normal) ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

@keyframes slideInRight {
    from { transform: translateX(100%); }
    to { transform: translateX(0); }
}

@keyframes slideOutRight {
    from { transform: translateX(0); }
    to { transform: translateX(100%); }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #1a1a1a;
        --bg-secondary: #2d2d2d;
        --text-primary: #ffffff;
        --text-secondary: #b3b3b3;
        --text-muted: #666666;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #0066cc;
        --bg-overlay: rgba(0, 0, 0, 0.95);
    }
    
    .control-button {
        border-width: 3px;
    }
    
    .progress-bar {
        border: 1px solid rgba(255, 255, 255, 0.5);
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High-DPI Canvas Optimization */
modern-360-viewer {
    display: block;
    width: 100%;
    height: 100%;
}

modern-360-viewer canvas {
    /* High-DPI rendering optimization */
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
    image-rendering: pixelated;
    
    /* Ensure smooth scaling */
    width: 100% !important;
    height: 100% !important;
    
    /* Disable browser image smoothing when scaled */
    -ms-interpolation-mode: nearest-neighbor;
    
    /* Hardware acceleration */
    will-change: transform, opacity;
    transform: translateZ(0);
    
    /* Touch action for mobile */
    touch-action: manipulation;
}

/* Mobile-specific canvas optimizations */
@media (max-width: 768px) {
    modern-360-viewer canvas {
        /* Force hardware acceleration on mobile */
        -webkit-transform: translateZ(0);
        transform: translateZ(0);
        -webkit-backface-visibility: hidden;
        backface-visibility: hidden;
        
        /* Better touch response */
        touch-action: pan-x pan-y pinch-zoom;
    }
}

/* High-DPI display optimization */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 2dppx) {
    modern-360-viewer canvas {
        /* Use crisp edges for high-DPI displays */
        image-rendering: -webkit-optimize-contrast;
        image-rendering: optimize-contrast;
        image-rendering: crisp-edges;
    }
}