:root {
    --bg-color: #101217;
    --sec-color: #1a1d24;
    --sec-color-2: #2a2d35;
    --green: rgb(86, 222, 147);
    --white: #ffffff;
    --border-radius: 12px;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
  }
  
  * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  
  body {
    font-family: "Arial", sans-serif;
    background-color: var(--bg-color);
    color: var(--white);
    line-height: 1.6;
    overflow-x: hidden;
  }
  
  /* Header */
  header {
    padding: 2rem 1rem;
    text-align: center;
    background: linear-gradient(135deg, var(--bg-color) 0%, var(--sec-color) 100%);
  }
  
  h1 {
    color: var(--green);
    font-size: clamp(2rem, 5vw, 3rem);
    margin-bottom: 0.5rem;
    font-weight: 700;
  }
  
  .subtitle {
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
    opacity: 0.8;
  }
  
  .subtitle:hover {
    opacity: 1;
    color: var(--green);
  }
  
  /* Modal */
  .modal {
    display: none;
    position: fixed;
    inset: 0;
    backdrop-filter: blur(8px);
    z-index: 999;
    align-items: center;
    justify-content: center;
  }
  
  .modal-content {
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
  }
  
  select {
    font-size: 1.5rem;
    padding: 1rem;
    color: var(--white);
    border: 2px solid var(--green);
    border-radius: var(--border-radius);
    cursor: pointer;
  }
  
  /* Container */
  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
  }
  
  /* Intro Section */
  .intro-section {
    text-align: center;
    margin: 3rem 0;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }
  
  .intro-section.visible {
    opacity: 1;
    transform: translateY(0);
  }
  
  .intro-text {
    font-size: 1.2rem;
    color: #aaa;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.8;
  }
  
  /* Filter Section */
  .filter-section {
    margin: 3rem 0;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }
  
  .filter-section.visible {
    opacity: 1;
    transform: translateY(0);
  }
  
  .filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 2rem;
  }
  
  .filter-btn {
    background: var(--green);
    border: none;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--bg-color);
    cursor: pointer;
    border-radius: 25px;
    transition: var(--transition);
    user-select: none;
  }
  
  .filter-btn:hover {
    background: #68d998;
    transform: translateY(-2px);
  }
  
  .filter-btn.active {
    box-shadow: 0 0 15px rgba(86, 222, 147, 0.5);
    background: #68d998;
  }
  
  /* Covers Grid */
  .covers-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    margin: 3rem 0;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }
  
  .covers-grid.visible {
    opacity: 1;
    transform: translateY(0);
  }
  
  @media (min-width: 768px) {
    .covers-grid {
      grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    }
  }
  
  @media (min-width: 1024px) {
    .covers-grid {
      grid-template-columns: repeat(2, 1fr);
    }
  }
  
  /* Cover Card */
  .cover-card {
    border-radius: var(--border-radius);
    padding: 2rem;
    transition: var(--transition);
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
  }
  
  .cover-card:hover {
    transform: translateY(-5px);
  }
  
  @keyframes fadeInUp {
    from {
      opacity: 0;
      transform: translateY(20px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
  
  /* Cover Header */
  .cover-header {
    margin-bottom: 1.5rem;
  }
  
  .cover-title {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 0.5rem;
    line-height: 1.3;
  }
  
  .cover-date {
    color: #aaa;
    font-size: 0.9rem;
    margin-bottom: 1rem;
  }
  
  .cover-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
  }
  
  .tag {
    background: var(--sec-color-2);
    color: var(--green);
    padding: 0.25rem 0.75rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid var(--green);
    transition: var(--transition);
  }
  
  .tag:hover {
    background: var(--green);
    color: var(--bg-color);
  }
  
  /* Video Container */
  .video-container {
    position: relative;
    width: 100%;
    height: 0;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
  }
  
  .video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
    border-radius: var(--border-radius);
  }
  
  /* Stats Section */
  .cover-stats {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--sec-color-2);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    color: #aaa;
  }
  
  .watch-on-youtube {
    color: var(--green);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
  }
  
  .watch-on-youtube:hover {
    color: var(--white);
    text-decoration: underline;
  }
  
  /* Footer */
  footer {
    margin-top: 6rem;
    padding: 3rem 1rem;
    text-align: center;
    background: var(--sec-color);
    border-top: 1px solid var(--sec-color-2);
  }
  
  .mirrors {
    color: var(--green);
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1rem;
  }
  
  .social-links {
    margin: 0.5rem 0;
  }
  
  .social-links a {
    color: var(--white);
    text-decoration: none;
    transition: var(--transition);
  }
  
  .social-links a:hover {
    color: var(--green);
  }
  
  /* Fade-in Animation */
  .fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }
  
  .fade-in.visible {
    opacity: 1;
    transform: translateY(0);
  }
  
  /* Mobile Optimizations */
  @media (max-width: 768px) {
    .container {
      padding: 0 0.5rem;
    }
  
    .cover-card {
      padding: 1.5rem;
    }
  
    .cover-title {
      font-size: 1.2rem;
    }
  
    .filter-buttons {
      gap: 0.5rem;
    }
  
    .filter-btn {
      padding: 0.5rem 1rem;
      font-size: 0.9rem;
    }
  
    .covers-grid {
      gap: 2rem;
    }
  
    .cover-stats {
      flex-direction: column;
      gap: 0.5rem;
      align-items: flex-start;
    }
  }
  
  @media (max-width: 480px) {
    .cover-card {
      padding: 1rem;
    }
  
    .intro-text {
      font-size: 1rem;
    }
  
    .cover-tags {
      gap: 0.25rem;
    }
  
    .tag {
      font-size: 0.7rem;
      padding: 0.2rem 0.5rem;
    }
  }
  
  /* Loading Animation */
  @keyframes pulse {
    0%,
    100% {
      opacity: 1;
    }
    50% {
      opacity: 0.5;
    }
  }
  
  .loading {
    animation: pulse 1.5s ease-in-out infinite;
  }
  
  /* Smooth Scrolling */
  html {
    scroll-behavior: smooth;
  }
  
  /* Custom Scrollbar */
  ::-webkit-scrollbar {
    width: 8px;
  }
  
  ::-webkit-scrollbar-track {
    background: var(--bg-color);
  }
  
  ::-webkit-scrollbar-thumb {
    background: var(--green);
    border-radius: 4px;
  }
  
  ::-webkit-scrollbar-thumb:hover {
    background: #68d998;
  }
  
  /* Responsive Video Adjustments */
  @media (max-width: 480px) {
    .video-container {
      padding-bottom: 60%; /* Slightly taller on mobile for better viewing */
    }
  }
  
  /* Hover Effects for Better Interaction */
  .cover-card:hover .cover-title {
    color: var(--green);
  }
  
  .cover-card:hover .video-container {
    transform: scale(1.02);
  }
  
  /* Focus States for Accessibility */
  .filter-btn:focus,
  .watch-on-youtube:focus {
    outline: 2px solid var(--green);
    outline-offset: 2px;
  }
  
  /* High Contrast Mode Support */
  @media (prefers-contrast: high) {
    .tag {
      border-width: 2px;
    }
  
    .cover-card {
      border-left-width: 6px;
    }
  }