/* ===== MOBILE-FIRST RESPONSIVE 3D PRODUCT SHOWCASE ===== */
/* Base styles for mobile (320px+) */

/* CSS Custom Properties for consistent theming */
:root {
    --primary-color: #4ade80;
    --primary-dark: #22c55e;
    --secondary-color: #764ba2;
    --accent-color: #667eea;
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.9);
    --text-muted: rgba(255, 255, 255, 0.7);
    --bg-primary: rgba(255, 255, 255, 0.1);
    --bg-secondary: rgba(255, 255, 255, 0.05);
    --border-color: rgba(255, 255, 255, 0.2);
    --shadow-light: rgba(255, 255, 255, 0.1);
    --shadow-primary: rgba(74, 222, 128, 0.3);
    --shadow-dark: rgba(0, 0, 0, 0.3);
    
    /* Spacing scale */
    --space-xs: 0.5rem;
    --space-sm: 0.75rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Typography scale */
    --font-size-xs: 0.875rem;
    --font-size-sm: 1rem;
    --font-size-base: 1.125rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 1.75rem;
    --font-size-3xl: 2rem;
    
    /* Touch targets */
    --touch-target: 2.75rem;
    --touch-target-large: 3.5rem;
    
    /* Transitions */
    --transition-fast: 0.2s 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;
    --z-floating: 1080;
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

*::before,
*::after {
    box-sizing: border-box;
}

html {
    font-size: 16px; /* Base font size for rem calculations */
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--secondary-color) 100%);
    min-height: 100vh;
    overflow-x: hidden;
    color: var(--text-primary);
    position: relative;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container and layout */
.container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    position: relative;
}

/* Mobile Navigation Toggle */
.mobile-toggle {
    display: block;
    position: fixed;
    top: var(--space-md);
    left: var(--space-md);
    z-index: var(--z-fixed);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: var(--space-sm);
    cursor: pointer;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
    min-width: var(--touch-target);
    min-height: var(--touch-target);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    font-size: var(--font-size-lg);
}

.mobile-toggle:hover,
.mobile-toggle:focus {
    background: var(--bg-secondary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-light);
}

.mobile-toggle:active {
    transform: translateY(0);
}

/* Product Showcase Container */
.product-showcase {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    position: relative;
}

/* ===== PRODUCT CARD SYSTEM ===== */

/* Product Card - Mobile First */
.product-card {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: var(--bg-primary);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    z-index: var(--z-modal);
    transform: translateX(0);
    transition: transform var(--transition-normal) cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.product-card.closed {
    transform: translateX(-100%);
}

/* Close Button - Highly Visible */
.close-btn {
    position: absolute;
    top: var(--space-lg);
    right: var(--space-lg);
    width: var(--touch-target-large);
    height: var(--touch-target-large);
    background: var(--primary-color);
    border: none;
    border-radius: 50%;
    color: var(--text-primary);
    font-size: var(--font-size-2xl);
    font-weight: 700;
    cursor: pointer;
    z-index: var(--z-floating);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 15px var(--shadow-primary);
    min-width: var(--touch-target-large);
    min-height: var(--touch-target-large);
}

.close-btn:hover,
.close-btn:focus {
    background: var(--primary-dark);
    transform: scale(1.1);
    box-shadow: 0 6px 20px var(--shadow-primary);
}

.close-btn:active {
    transform: scale(0.95);
}

.close-icon {
    line-height: 1;
    font-weight: 700;
}

/* Card Content */
.card-content {
    flex: 1;
    padding: calc(var(--touch-target-large) + var(--space-xl)) var(--space-lg) var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

/* Product Information */
.product-info {
    margin-bottom: var(--space-xl);
}

.product-info h2 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--space-sm);
    font-weight: 600;
    line-height: 1.2;
}

.product-info .price {
    font-size: var(--font-size-xl);
    color: var(--primary-color);
    margin-bottom: var(--space-lg);
    font-weight: 700;
}

.product-info p {
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
    font-size: var(--font-size-base);
}

/* Product Specifications */
.product-specs {
    background: var(--bg-secondary);
    border-radius: 0.75rem;
    padding: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.product-specs h3 {
    margin-bottom: var(--space-lg);
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.spec-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--space-md);
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--border-color);
    font-size: var(--font-size-base);
}

.spec-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

/* Product Selector */
.product-selector h3 {
    margin-bottom: var(--space-lg);
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.product-thumbnails {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
}

.thumbnail {
    background: var(--bg-secondary);
    border: 2px solid transparent;
    border-radius: 0.75rem;
    padding: var(--space-lg);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    min-height: var(--touch-target-large);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    color: var(--text-primary);
    text-decoration: none;
    font-family: inherit;
    font-size: inherit;
}

.thumbnail:hover,
.thumbnail:focus {
    background: var(--bg-primary);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--shadow-light);
}

.thumbnail.active {
    border-color: var(--primary-color);
    background: rgba(74, 222, 128, 0.1);
}

.thumbnail-icon {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--space-xs);
}

.thumbnail-name {
    font-size: var(--font-size-sm);
    font-weight: 500;
}

/* Buy Button */
.buy-button {
    width: 100%;
    background: linear-gradient(45deg, var(--primary-color), var(--primary-dark));
    border: none;
    border-radius: 0.75rem;
    padding: var(--space-lg);
    color: var(--text-primary);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    margin-top: var(--space-lg);
    min-height: var(--touch-target-large);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    box-shadow: 0 4px 15px rgba(74, 222, 128, 0.3);
}

.buy-button:hover,
.buy-button:focus {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--shadow-primary);
}

.buy-button:active {
    transform: translateY(0);
}

.button-icon {
    font-size: var(--font-size-lg);
}

/* ===== 3D MODEL CONTAINER ===== */

/* Model Container */
.model-container {
    flex: 1;
    position: relative;
    min-height: calc(100vh - var(--touch-target) - var(--space-lg));
    margin-top: calc(var(--touch-target) + var(--space-lg));
}

/* 3D Viewport */
.viewport {
    width: 100%;
    height: 100%;
    position: relative;
    cursor: grab;
    min-height: 60vh;
}

.viewport:active {
    cursor: grabbing;
}

/* Controls */
.controls {
    position: absolute;
    top: var(--space-lg);
    right: var(--space-lg);
    z-index: var(--z-sticky);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.control-btn {
    width: var(--touch-target-large);
    height: var(--touch-target-large);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: var(--text-primary);
    font-size: var(--font-size-lg);
    min-width: var(--touch-target-large);
    min-height: var(--touch-target-large);
}

.control-btn:hover,
.control-btn:focus {
    background: var(--bg-secondary);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px var(--shadow-light);
}

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

/* Loading State */
.loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: var(--z-modal);
    text-align: center;
}

.spinner {
    width: 3.75rem;
    height: 3.75rem;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top: 3px solid var(--text-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--space-lg);
}

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

.loading p {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
}

/* Instructions */
.instructions {
    position: absolute;
    bottom: var(--space-lg);
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: var(--text-muted);
    z-index: var(--z-sticky);
    background: var(--bg-primary);
    padding: var(--space-md);
    border-radius: 0.5rem;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
}

.instructions p {
    margin-bottom: var(--space-xs);
    font-size: var(--font-size-sm);
}

.instructions p:last-child {
    margin-bottom: 0;
}

/* ===== FLOATING INFO TOGGLE BUTTON ===== */

/* Info Toggle Button (Mobile Only) */
.info-toggle {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    width: var(--touch-target-large);
    height: var(--touch-target-large);
    background: var(--primary-color);
    border: none;
    border-radius: 50%;
    color: var(--text-primary);
    font-size: var(--font-size-lg);
    cursor: pointer;
    z-index: var(--z-floating);
    display: none; /* Hidden by default, shown when card is closed */
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 15px var(--shadow-primary);
    min-width: var(--touch-target-large);
    min-height: var(--touch-target-large);
}

.info-toggle:hover,
.info-toggle:focus {
    background: var(--primary-dark);
    transform: scale(1.1);
    box-shadow: 0 6px 20px var(--shadow-primary);
}

.info-toggle:active {
    transform: scale(0.95);
}

.info-toggle.visible {
    display: flex;
}

.info-icon {
    font-size: var(--font-size-lg);
}

/* ===== RESPONSIVE BREAKPOINTS ===== */

/* Mobile Large (481px - 768px) */
@media (min-width: 481px) {
    .product-card {
        width: 85%;
        max-width: 400px;
    }
    
    .product-thumbnails {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .controls {
        top: var(--space-xl);
        right: var(--space-xl);
    }
    
    .instructions {
        bottom: var(--space-xl);
    }
    
    .info-toggle {
        bottom: var(--space-xl);
        right: var(--space-xl);
    }
}

/* Tablet (769px - 1024px) */
@media (min-width: 769px) {
    .product-showcase {
        flex-direction: row;
    }
    
    .mobile-toggle {
        display: none;
    }
    
    .product-card {
        position: relative;
        width: 320px;
        height: 100vh;
        transform: none;
        flex-shrink: 0;
        border-right: 1px solid var(--border-color);
        border-top: none;
        border-left: none;
        border-bottom: none;
    }
    
    .close-btn {
        display: none; /* Hide close button on tablet+ */
    }
    
    .card-content {
        padding: var(--space-2xl) var(--space-lg) var(--space-lg);
    }
    
    .model-container {
        margin-top: 0;
        min-height: 100vh;
    }
    
    .controls {
        top: var(--space-2xl);
        right: var(--space-2xl);
        flex-direction: row;
        gap: var(--space-md);
    }
    
    .instructions {
        bottom: var(--space-2xl);
        left: 50%;
        transform: translateX(-50%);
    }
    
    .product-thumbnails {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-lg);
    }
    
    .thumbnail {
        padding: var(--space-xl);
    }
    
    .info-toggle {
        display: none; /* Hide on tablet+ */
    }
}

/* Desktop Small (1025px - 1200px) */
@media (min-width: 1025px) {
    .product-card {
        width: 360px;
        padding: var(--space-2xl);
    }
    
    .product-info h2 {
        font-size: var(--font-size-3xl);
    }
    
    .product-info .price {
        font-size: var(--font-size-2xl);
    }
    
    .product-thumbnails {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-xl);
    }
    
    .controls {
        top: var(--space-2xl);
        right: var(--space-2xl);
    }
}

/* Desktop Large (1201px+) */
@media (min-width: 1201px) {
    .product-card {
        width: 400px;
    }
    
    .product-thumbnails {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-xl);
    }
    
    .controls {
        top: var(--space-2xl);
        right: var(--space-2xl);
    }
    
    .instructions {
        bottom: var(--space-2xl);
    }
}

/* ===== ACCESSIBILITY & UX ENHANCEMENTS ===== */

/* Focus styles for keyboard navigation */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: rgba(255, 255, 255, 0.8);
        --bg-primary: rgba(255, 255, 255, 0.2);
        --bg-secondary: rgba(255, 255, 255, 0.15);
    }
}

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

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #ffffff;
        --text-secondary: rgba(255, 255, 255, 0.9);
        --text-muted: rgba(255, 255, 255, 0.7);
    }
}

/* Print styles */
@media print {
    .mobile-toggle,
    .controls,
    .instructions,
    .info-toggle {
        display: none;
    }
    
    .product-card {
        position: static;
        width: 100%;
        height: auto;
        transform: none;
        background: white;
        color: black;
    }
    
    .model-container {
        display: none;
    }
}

/* ===== PERFORMANCE OPTIMIZATIONS ===== */

/* Hardware acceleration for animations */
.product-card,
.control-btn,
.thumbnail,
.buy-button,
.close-btn,
.info-toggle {
    will-change: transform;
    transform: translateZ(0);
    -webkit-transform: translateZ(0);
}

/* Smooth scrolling for product card */
.product-card {
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;
}

.product-card::-webkit-scrollbar {
    width: 6px;
}

.product-card::-webkit-scrollbar-track {
    background: transparent;
}

.product-card::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

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

/* ===== MOBILE CARD ANIMATIONS ===== */

/* Card slide animations */
.product-card {
    transition: transform var(--transition-normal) cubic-bezier(0.4, 0, 0.2, 1);
}

.product-card.closed {
    transform: translateX(-100%);
}

/* Info toggle button animations */
.info-toggle {
    transition: all var(--transition-normal) cubic-bezier(0.4, 0, 0.2, 1);
}

.info-toggle.visible {
    animation: fadeInUp 0.3s ease-out;
}

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

/* ===== MOBILE-SPECIFIC OPTIMIZATIONS ===== */

@media (max-width: 768px) {
    /* Ensure 3D model takes full space when card is closed */
    .model-container {
        margin-top: calc(var(--touch-target) + var(--space-lg));
        min-height: calc(100vh - var(--touch-target) - var(--space-lg));
    }
    
    /* Mobile toggle should always be visible */
    .mobile-toggle {
        display: flex !important;
    }
    
    /* Optimize touch interactions */
    .product-card {
        -webkit-overflow-scrolling: touch;
    }
    
    /* Ensure proper z-index layering on mobile */
    .product-card {
        z-index: var(--z-modal);
    }
    
    .info-toggle {
        z-index: var(--z-floating);
    }
}