/* Reset default margin and padding */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  /* Enhanced Root Variables */
  :root {
    --primary-color: #1caad9;
    --primary-color-dark: #1790b9;
    --primary-color-light: #3eb8e2;
    --background-color: #0f0f0f;
    --background-gradient: linear-gradient(135deg, #0f0f0f 0%, #1a1a1a 100%);
    --card-background: #1a1a1a;
    --card-background-hover: #222;
    --text-color: #fff;
    --secondary-text: #bbb;
    --accent-color: #ff4081;
    --accent-color-dark: #e03669;
    --card-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    --card-shadow-hover: 0 8px 20px rgba(0, 0, 0, 0.4);
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
  }
  
  /* Improved Body Styling */
  body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--background-gradient);
    color: var(--text-color);
    line-height: 1.6;
    padding-top: 60px; /* For fixed header */
    min-height: 100vh;
  }
  
  /* Enhanced Header */
  header {
    background-color: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.5);
    padding: 10px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: padding var(--transition-medium);
  }
  
  /* Shrink header on scroll */
  header.scrolled {
    padding: 5px 20px;
  }
  
  .logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    transition: transform var(--transition-medium);
  }
  
  .logo:hover {
    transform: scale(1.05);
  }
  
  .logo i {
    margin-right: 8px;
    transform: rotate(0deg);
    transition: transform var(--transition-medium);
  }
  
  .logo:hover i {
    transform: rotate(20deg);
  }
  
  .search-and-nav {
    display: flex;
    align-items: center;
  }
  
  /* Enhanced Navigation */
  nav ul {
    display: flex;
    list-style: none;
  }
  
  nav ul li {
    margin-left: 20px;
  }
  
  nav ul li a {
    color: var(--text-color);
    text-decoration: none;
    transition: all var(--transition-medium);
    padding: 5px 10px;
    border-radius: 4px;
    position: relative;
  }
  
  nav ul li a::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: all var(--transition-medium);
    transform: translateX(-50%);
  }
  
  nav ul li a:hover {
    color: var(--primary-color-light);
  }
  
  nav ul li a:hover::after {
    width: 80%;
  }
  
  /* Improved Search Bar */
.search-bar {
    position: relative;
    margin-right: 15px;
    transition: width var(--transition-medium);
  }
  
  .search-bar input {
    padding: 8px 35px 8px 12px;
    border-radius: 20px;
    border: 1px solid transparent;
    background-color: #333;
    color: var(--text-color);
    width: 200px;
    transition: all var(--transition-medium);
  }
  
  .search-bar input:focus {
    outline: none;
    border-color: var(--primary-color);
    background-color: #3a3a3a;
    width: 220px;
    box-shadow: 0 0 0 2px rgba(28, 170, 217, 0.2);
  }
  
  .search-bar i {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--secondary-text);
    transition: color var(--transition-fast);
  }
  
  .search-bar:hover i {
    color: var(--primary-color);
  }
  
  /* Main Content Styles */
  .main-container {
    max-width: 1200px;
    margin: 20px auto;
    padding: 0 20px;
  }
  
  /* Enhanced Category Title */
  .category-title {
    margin: 40px 0 15px;
    padding-bottom: 12px;
    border-bottom: 1px solid #333;
    font-size: 2rem;
    color: var(--primary-color);
    position: relative;
  }
  
  .category-title::before {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 80px;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 3px;
  }
  
  .category-description {
    margin-bottom: 25px;
    color: var(--secondary-text);
    font-size: 1.05rem;
    max-width: 800px;
  }
  
  /* Improved Model Grid */
  .model-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 25px;
    margin-bottom: 40px;
  }
  
  /* Improved Card Styling and Animations */
  .model-card {
    background-color: var(--card-background);
    border-radius: 12px;
    overflow: hidden;
    transition: transform var(--transition-medium),
                box-shadow var(--transition-medium),
                background-color var(--transition-medium);
    box-shadow: var(--card-shadow);
    position: relative;
  }
  
  .model-card.featured-model {
    border: 1px solid var(--primary-color-dark);
    box-shadow: 0 0 15px rgba(28, 170, 217, 0.2);
  }
  
  .model-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at top right, 
                             rgba(28, 170, 217, 0.1),
                             transparent 65%);
    opacity: 0;
    transition: opacity var(--transition-medium);
    pointer-events: none;
    z-index: 1;
  }
  
  .model-card:hover {
    transform: translateY(-8px) scale(1.01);
    box-shadow: var(--card-shadow-hover);
    background-color: var(--card-background-hover);
  }
  
  .model-card:hover::before {
    opacity: 1;
  }
  
  .model-embed {
    width: 100%;
    padding-top: 75%; /* 4:3 Aspect ratio */
    position: relative;
    overflow: hidden;
  }
  
  .model-embed iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
    transition: transform var(--transition-slow);
  }
  
  .model-info {
    padding: 20px;
    position: relative;
    z-index: 2;
  }
  
  .model-title {
    font-size: 1.3rem;
    margin-bottom: 8px;
    color: var(--primary-color);
    position: relative;
    display: inline-block;
  }
  
  .model-title::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -3px;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width var(--transition-medium);
  }
  
  .model-card:hover .model-title::after {
    width: 100%;
  }
  
  .model-description {
    color: var(--secondary-text);
    font-size: 0.95rem;
    margin-bottom: 12px;
    line-height: 1.5;
  }
  
  /* Model Tags */
  .model-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 15px;
  }
  
  .tag {
    padding: 4px 10px;
    background-color: rgba(28, 170, 217, 0.15);
    color: var(--primary-color-light);
    border-radius: 12px;
    font-size: 0.8rem;
    transition: all var(--transition-fast);
  }
  
  .tag:hover {
    background-color: rgba(28, 170, 217, 0.25);
    transform: scale(1.05);
  }
  
  .attribution {
    font-size: 14px;
    color: var(--secondary-text);
  }
  
  .attribution a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
  }
  
  .attribution a:hover {
    text-decoration: underline;
    color: var(--primary-color-light);
  }
  
  /* Enhanced Filter Controls */
  .filters {
    background-color: rgba(26, 26, 26, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 18px 25px;
    border-radius: 12px;
    margin-bottom: 35px;
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    align-items: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.05);
  }
  
  .filter-label {
    font-weight: 600;
    margin-right: 12px;
    color: var(--text-color);
  }
  
  .filter-options {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
  }
  
  .filter-btn {
    padding: 8px 18px;
    background-color: #333;
    border: none;
    border-radius: 20px;
    color: var(--text-color);
    cursor: pointer;
    transition: all var(--transition-medium);
    font-size: 0.95rem;
  }
  
  .filter-btn.active {
    background-color: var(--primary-color);
    box-shadow: 0 2px 10px rgba(28, 170, 217, 0.4);
  }
  
  .filter-btn:hover:not(.active) {
    background-color: #444;
    transform: translateY(-2px);
  }
  
  /* Button Styles */
  .btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-medium);
    border: none;
    font-size: 0.95rem;
  }
  
  .primary-btn {
    background-color: var(--primary-color);
    color: white;
  }
  
  .primary-btn:hover {
    background-color: var(--primary-color-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  }
  
  .secondary-btn {
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
  }
  
  .secondary-btn:hover {
    background-color: rgba(28, 170, 217, 0.1);
    transform: translateY(-2px);
  }
  
  /* Footer Styles */
  footer {
    background-color: #0a0a0a;
    padding: 40px 20px;
    margin-top: 70px;
    position: relative;
  }
  
  footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(to right, var(--primary-color-dark), var(--primary-color), var(--primary-color-light));
    opacity: 0.7;
  }
  
  .footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
  }
  
  .footer-section {
    flex: 1;
    min-width: 250px;
    margin-bottom: 25px;
  }
  
  .footer-title {
    font-size: 1.3rem;
    margin-bottom: 20px;
    color: var(--primary-color);
    position: relative;
    padding-bottom: 10px;
  }
  
  .footer-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background-color: var(--primary-color);
  }
  
  .footer-links a {
    display: block;
    color: var(--secondary-text);
    text-decoration: none;
    margin-bottom: 10px;
    transition: all var(--transition-medium);
    padding: 2px 0;
  }
  
  .footer-links a:hover {
    color: var(--text-color);
    transform: translateX(5px);
  }
  
  .social-icons {
    display: flex;
    gap: 15px;
    justify-content: flex-start;
    margin-top: 20px;
  }
  
  .social-icons a {
    color: var(--secondary-text);
    font-size: 1.5rem;
    transition: all var(--transition-medium);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.05);
  }
  
  .social-icons a:hover {
    color: var(--primary-color);
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-3px);
  }
  
  .copyright {
    margin-top: 40px;
    color: #666;
    font-size: 0.9rem;
    text-align: center;
    width: 100%;
    padding-top: 20px;
    border-top: 1px solid #222;
  }
  
  /* Improved Loading Animation */
  .loader {
    width: 100%;
    height: 4px;
    background-color: rgba(51, 51, 51, 0.8);
    position: fixed;
    top: 0;
    overflow: hidden;
    z-index: 1001;
  }
  
  .loader:before {
    content: "";
    position: absolute;
    height: 4px;
    width: 30%;
    background: linear-gradient(to right, transparent, var(--primary-color), var(--primary-color-light), transparent);
    animation: loading 1.5s infinite ease-in-out;
    border-radius: 2px;
  }
  
  @keyframes loading {
    0% { 
      left: -30%;
      opacity: 0.6;
    }
    50% { 
      left: 100%; 
      opacity: 1;
    }
    100% { 
      left: -30%;
      opacity: 0.6;
    }
  }
  
  /* Scroll Reveal Animation */
  .reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
  }
  
  .reveal.visible {
    opacity: 1;
    transform: translateY(0);
  }
  
  /* Responsive Styles */
  @media (max-width: 768px) {
    header {
      flex-direction: column;
      padding: 10px;
    }
  
    .logo {
      margin-bottom: 10px;
    }
  
    .search-and-nav {
      width: 100%;
      flex-direction: column;
    }
  
    .search-bar {
      margin: 10px 0;
      width: 100%;
    }
  
    .search-bar input {
      width: 100%;
    }
  
    nav ul {
      justify-content: center;
      margin: 10px 0;
      flex-wrap: wrap;
    }
  
    nav ul li {
      margin: 5px 10px;
    }
  
    .model-grid {
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
  
    .filters {
      flex-direction: column;
      align-items: flex-start;
    }
    
    .filter-options {
      margin-top: 8px;
    }
  }
  
  @media (max-width: 480px) {
    .model-grid {
      grid-template-columns: 1fr;
    }
    
    .category-title {
      font-size: 1.6rem;
    }
    
    .footer-section {
      flex-basis: 100%;
    }
  }
  
  /* Pulse Animation for Featured Elements */
  @keyframes pulse {
    0% {
      box-shadow: 0 0 0 0 rgba(28, 170, 217, 0.4);
    }
    70% {
      box-shadow: 0 0 0 10px rgba(28, 170, 217, 0);
    }
    100% {
      box-shadow: 0 0 0 0 rgba(28, 170, 217, 0);
    }
  }
  
  .featured-model {
    animation: pulse 2s infinite;
  }