/* Design System Implementation */
:root {
    /* Primary Colors */
    --primary-navy: #1a1d29;
    --primary-blue: #2563eb;
    --primary-accent: #3b82f6;
    
    /* Secondary Colors */
    --secondary-warm: #f59e0b;
    --secondary-orange: #ea580c;
    --secondary-green: #10b981;
    --secondary-red: #ef4444;
    
    /* Neutral Palette */
    --neutral-900: #111827;
    --neutral-800: #1f2937;
    --neutral-700: #374151;
    --neutral-600: #4b5563;
    --neutral-500: #6b7280;
    --neutral-400: #9ca3af;
    --neutral-300: #d1d5db;
    --neutral-200: #e5e7eb;
    --neutral-100: #f3f4f6;
    --neutral-50: #f9fafb;
    --white: #ffffff;
    
    /* Glassmorphism & Effects */
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --backdrop-blur: blur(20px);
    --shadow-soft: 0 8px 32px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 12px 48px rgba(0, 0, 0, 0.15);
    --shadow-strong: 0 20px 64px rgba(0, 0, 0, 0.2);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', Monaco, Consolas, monospace;
    --font-display: 'Plus Jakarta Sans', 'Inter', sans-serif;
    
    /* Type Scale */
    --text-5xl: 3rem;
    --text-4xl: 2.25rem;
    --text-3xl: 1.875rem;
    --text-2xl: 1.5rem;
    --text-xl: 1.25rem;
    --text-lg: 1.125rem;
    --text-base: 1rem;
    --text-sm: 0.875rem;
    --text-xs: 0.75rem;
    
    /* Spacing */
    --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;
    --space-24: 6rem;
    
    /* Animation */
    --ease-out: cubic-bezier(0, 0, 0.2, 1);
    --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

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

body {
    font-family: var(--font-primary);
    background: linear-gradient(135deg, var(--neutral-50) 0%, var(--neutral-100) 100%);
    color: var(--neutral-900);
    line-height: 1.6;
    min-height: 100vh;
}

/* Navigation */
.nav-top {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: var(--backdrop-blur);
    border-bottom: 1px solid var(--neutral-200);
    padding: var(--space-4) 0;
    position: sticky;
    top: 0;
    z-index: 50;
    box-shadow: var(--shadow-soft);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--primary-navy);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.nav-menu {
    display: flex;
    gap: var(--space-2);
    list-style: none;
}

.nav-item {
    padding: var(--space-2) var(--space-4);
    border-radius: 8px;
    color: var(--neutral-600);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s ease;
}

.nav-item:hover,
.nav-item.active {
    background: var(--primary-blue);
    color: var(--white);
}

/* Mobile Navigation */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: var(--text-2xl);
    color: var(--neutral-700);
    cursor: pointer;
    padding: var(--space-2);
    border-radius: 8px;
    transition: all 0.2s var(--ease-out);
}

.mobile-menu-btn:hover {
    background: var(--neutral-100);
    color: var(--primary-blue);
}

/* Hamburger Icon */
.hamburger {
    width: 24px;
    height: 18px;
    position: relative;
    cursor: pointer;
}

.hamburger span {
    display: block;
    position: absolute;
    height: 2px;
    width: 100%;
    background: currentColor;
    border-radius: 2px;
    opacity: 1;
    left: 0;
    transform: rotate(0deg);
    transition: 0.25s ease-in-out;
}

.hamburger span:nth-child(1) {
    top: 0px;
}

.hamburger span:nth-child(2) {
    top: 8px;
}

.hamburger span:nth-child(3) {
    top: 16px;
}

/* Hamburger Animation */
.mobile-menu-btn.active .hamburger span:nth-child(1) {
    top: 8px;
    transform: rotate(135deg);
}

.mobile-menu-btn.active .hamburger span:nth-child(2) {
    opacity: 0;
    left: -60px;
}

.mobile-menu-btn.active .hamburger span:nth-child(3) {
    top: 8px;
    transform: rotate(-135deg);
}

/* Mobile Menu Overlay */
.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 998;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s var(--ease-out);
}

.mobile-menu-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Mobile Menu Panel */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 300px;
    max-width: 85vw;
    height: 100vh;
    background: var(--white);
    z-index: 999;
    transition: right 0.3s var(--ease-out);
    box-shadow: var(--shadow-strong);
    display: flex;
    flex-direction: column;
}

.mobile-menu.active {
    right: 0;
}

.mobile-menu-header {
    padding: var(--space-6);
    border-bottom: 1px solid var(--neutral-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.mobile-menu-close {
    background: none;
    border: none;
    font-size: var(--text-2xl);
    color: var(--neutral-700);
    cursor: pointer;
    padding: var(--space-2);
    border-radius: 8px;
    transition: all 0.2s var(--ease-out);
}

.mobile-menu-close:hover {
    background: var(--neutral-100);
    color: var(--primary-blue);
}

.mobile-menu-nav {
    flex: 1;
    padding: var(--space-6);
}

.mobile-menu-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.mobile-menu-nav li {
    margin-bottom: var(--space-2);
}

.mobile-menu-nav .nav-item {
    display: block;
    padding: var(--space-4);
    font-size: var(--text-lg);
    font-weight: 500;
    border-radius: 12px;
    transition: all 0.2s var(--ease-out);
}

.mobile-menu-nav .nav-item:hover {
    background: var(--neutral-100);
    transform: translateX(4px);
}

.mobile-menu-nav .nav-item.active {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-accent) 100%);
    color: var(--white);
}

.mobile-menu-footer {
    padding: var(--space-6);
    border-top: 1px solid var(--neutral-200);
    text-align: center;
}

.mobile-menu-footer p {
    color: var(--neutral-500);
    font-size: var(--text-sm);
    margin: 0;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-navy) 0%, var(--neutral-800) 100%);
    color: var(--white);
    padding: var(--space-16) 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--primary-accent) 0%, transparent 70%);
    opacity: 0.1;
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-30px) rotate(180deg); }
}

.hero-content {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: var(--text-5xl);
    font-weight: 800;
    margin-bottom: var(--space-4);
    background: linear-gradient(135deg, var(--white) 0%, var(--primary-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--text-xl);
    color: var(--neutral-300);
    max-width: 600px;
}

/* Stats Section */
.stats-section {
    max-width: 1280px;
    margin: calc(var(--space-8) * -1) auto var(--space-12);
    padding: 0 var(--space-6);
    position: relative;
    z-index: 10;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-6);
}

.stat-card {
    background: var(--white);
    border-radius: 20px;
    padding: var(--space-6);
    box-shadow: var(--shadow-medium);
    text-align: center;
    transition: transform 0.3s var(--ease-bounce);
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--space-3);
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-accent) 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.stat-number {
    font-size: var(--text-3xl);
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-2);
}

.stat-label {
    font-size: var(--text-sm);
    color: var(--neutral-600);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Filter Section */
.filter-section {
    max-width: 1280px;
    margin: 0 auto var(--space-8);
    padding: 0 var(--space-6);
}

.filter-container {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
    align-items: center;
}

.filter-btn {
    padding: var(--space-2) var(--space-4);
    border: 1px solid var(--neutral-300);
    background: var(--white);
    border-radius: 20px;
    font-size: var(--text-sm);
    color: var(--neutral-600);
    cursor: pointer;
    transition: all 0.2s ease;
    font-weight: 500;
}

.filter-btn:hover {
    border-color: var(--primary-blue);
    color: var(--primary-blue);
    transform: translateY(-2px);
}

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

/* Gallery Grid */
.gallery-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-6) var(--space-16);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--space-8);
}

.model-card {
    background: var(--white);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    transition: all 0.3s ease;
    position: relative;
}

.model-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-strong);
}

.model-thumbnail {
    width: 100%;
    height: 250px;
    background: linear-gradient(135deg, var(--neutral-800) 0%, var(--neutral-900) 100%);
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.model-thumbnail::before {
    content: '🎮';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 48px;
    opacity: 0.3;
}

.model-thumbnail:hover::after {
    content: 'Click to View 3D Model';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--white);
    font-weight: 600;
    background: rgba(0, 0, 0, 0.7);
    padding: var(--space-3) var(--space-6);
    border-radius: 12px;
    backdrop-filter: blur(10px);
}

.model-info {
    padding: var(--space-6);
}

.model-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-3);
}

.model-title {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--primary-navy);
}

.model-status {
    padding: var(--space-1) var(--space-3);
    border-radius: 20px;
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
}

.status-completed {
    background: rgba(16, 185, 129, 0.1);
    color: var(--secondary-green);
}

.status-progress {
    background: rgba(245, 158, 11, 0.1);
    color: var(--secondary-warm);
}

.status-review {
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary-blue);
}

.model-category {
    display: inline-block;
    padding: var(--space-1) var(--space-2);
    background: var(--neutral-100);
    border-radius: 6px;
    font-size: var(--text-xs);
    color: var(--neutral-600);
    margin-bottom: var(--space-3);
    font-family: var(--font-mono);
}

.model-description {
    color: var(--neutral-600);
    font-size: var(--text-sm);
    line-height: 1.6;
    margin-bottom: var(--space-4);
}

.model-actions {
    display: flex;
    gap: var(--space-3);
}

.btn-view-3d {
    flex: 1;
    padding: var(--space-3);
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-accent) 100%);
    color: var(--white);
    border: none;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-view-3d:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.btn-details {
    padding: var(--space-3);
    background: var(--glass-bg);
    border: 1px solid var(--neutral-300);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-details:hover {
    border-color: var(--primary-blue);
    color: var(--primary-blue);
}

/* Modal for 3D Viewer */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 100;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.active {
    display: flex;
    opacity: 1;
    align-items: center;
    justify-content: center;
}

.modal-content {
    width: 90%;
    max-width: 1200px;
    height: 80vh;
    background: var(--white);
    border-radius: 20px;
    overflow: hidden;
    position: relative;
    box-shadow: var(--shadow-strong);
}

.modal-header {
    background: linear-gradient(135deg, var(--primary-navy) 0%, var(--neutral-800) 100%);
    color: var(--white);
    padding: var(--space-4) var(--space-6);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: var(--text-xl);
    font-weight: 600;
}

.modal-close {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 24px;
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(90deg);
}

.viewer-container {
    width: 100%;
    height: calc(100% - 70px);
    background: var(--neutral-100);
    position: relative;
}

#api-frame {
    width: 100%;
    height: 100%;
    border: none;
}

.hidden {
    visibility: hidden;
    height: 0;
    width: 0;
}

.loading-spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    border: 4px solid var(--neutral-300);
    border-top-color: var(--primary-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

.viewer-controls {
    position: absolute;
    bottom: var(--space-4);
    left: 50%;
    transform: translateX(-50%);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: var(--space-3);
    border-radius: 12px;
    display: flex;
    gap: var(--space-2);
    box-shadow: var(--shadow-medium);
}

.control-btn {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background: var(--white);
    border: 1px solid var(--neutral-300);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.control-btn:hover {
    background: var(--primary-blue);
    color: var(--white);
    transform: translateY(-2px);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: var(--text-3xl);
    }
    
    .nav-menu {
        display: none;
    }
    
    .gallery-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .modal-content {
        width: 95%;
        height: 90vh;
        border-radius: 10px;
    }
}

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

.animate-fadeInUp {
    animation: fadeInUp 0.5s var(--ease-out);
}

/* Environment Section */
.environments-section {
    padding: var(--space-20) 0;
    background: linear-gradient(135deg, var(--neutral-100) 0%, var(--white) 100%);
    border-top: 1px solid var(--neutral-200);
}

.environments-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.section-subtitle {
    color: var(--neutral-600);
    font-size: var(--text-lg);
    text-align: center;
    margin-bottom: var(--space-12);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.environments-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-8);
    margin-top: var(--space-12);
}

.environment-card {
    background: var(--white);
    border-radius: 24px;
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    transition: all 0.3s var(--ease-out);
    position: relative;
    border: 1px solid var(--neutral-200);
}

.environment-card:hover {
    transform: translateY(-12px);
    box-shadow: var(--shadow-strong);
    border-color: var(--primary-accent);
}

.environment-thumbnail {
    width: 100%;
    height: 280px;
    background: linear-gradient(135deg, var(--neutral-800) 0%, var(--neutral-900) 100%);
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.environment-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s var(--ease-out);
}

.environment-card:hover .environment-thumbnail img {
    transform: scale(1.05);
}

.environment-overlay {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: var(--backdrop-blur);
    padding: var(--space-2) var(--space-3);
    border-radius: 12px;
    border: 1px solid var(--neutral-200);
}

.environment-type {
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--primary-blue);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.environment-info {
    padding: var(--space-6);
}

.environment-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-3);
}

.environment-title {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--primary-navy);
    line-height: 1.3;
    margin-bottom: var(--space-1);
}

.environment-status {
    padding: var(--space-2) var(--space-3);
    border-radius: 20px;
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.environment-category {
    display: inline-block;
    background: var(--neutral-100);
    color: var(--neutral-700);
    padding: var(--space-1) var(--space-3);
    border-radius: 12px;
    font-size: var(--text-xs);
    font-weight: 500;
    margin-bottom: var(--space-4);
}

.environment-description {
    color: var(--neutral-600);
    font-size: var(--text-sm);
    line-height: 1.6;
    margin-bottom: var(--space-6);
}

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

/* Environment 3D Viewer */
.environment-viewer {
    width: 100%;
    height: 100%;
    background: var(--neutral-100);
    border-radius: 12px;
    overflow: hidden;
    position: relative;
}

.environment-viewer canvas {
    width: 100%;
    height: 100%;
    display: block;
}

/* Environment Modal Specific Styles */
#environmentModal .modal-content {
    max-width: 90vw;
    max-height: 90vh;
}

#environmentModal .viewer-container {
    height: 70vh;
    min-height: 500px;
}

#environmentModal .loading-spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    border: 4px solid var(--neutral-200);
    border-top: 4px solid var(--primary-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    z-index: 10;
}

@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

/* Updated Responsive Design for Environment Section */
@media (max-width: 768px) {
    /* Mobile Navigation */
    .nav-menu {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .nav-container {
        padding: 0 var(--space-4);
    }
    
    .nav-logo {
        font-size: var(--text-lg);
    }
    
    /* Environment Section */
    .environments-container {
        padding: 0 var(--space-4);
    }
    
    .environments-grid {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }
    
    #environmentModal .viewer-container {
        height: 50vh;
        min-height: 300px;
    }
    
    /* Other responsive adjustments */
    .gallery-container {
        padding: var(--space-6) var(--space-4);
    }
    
    .gallery-grid {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }
    
    .hero {
        padding: var(--space-16) 0 var(--space-12);
    }
    
    .hero-title {
        font-size: var(--text-4xl);
    }
    
    .filter-container {
        flex-wrap: wrap;
        gap: var(--space-2);
    }
    
    .modal-content {
        margin: var(--space-4);
        max-height: calc(100vh - 2rem);
    }
    
    .viewer-container {
        height: 300px;
    }
}