:root {
      --bg-dark: #000000;
      --text-light: #ffffff;
      --text-muted: rgba(255, 255, 255, 0.7);
      --text-dark: #000000;
      --card-bg: rgba(255, 255, 255, 0.9);
      --card-border: rgba(229, 231, 235, 0.8);
      --card-hover-border: rgba(209, 213, 219, 1);
      --btn-bg: #000000;
      --btn-hover: #1f2937;
      --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    }

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

    body {
      font-family: var(--font-family);
      background-color: var(--bg-dark);
      color: var(--text-light);
      min-height: 100vh;
      overflow-x: hidden;
      display: flex;
      flex-direction: column;
    }

    /* Shader Canvas */
    #bg-canvas {
      position: fixed;
      top: -6vh;
      left: -6vw;
      width: 112vw;
      height: 112vh;
      z-index: -10;
      display: block;
      background-color: #000000;
      transform: translate3d(0, 0, 0);
      backface-visibility: hidden;
      perspective: 1000;
      pointer-events: none;
    }

    /* Layout */
    .app-layout {
      display: flex;
      flex-direction: column;
      min-height: 100vh;
      position: relative;
      z-index: 1;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    /* Header / Navbar */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 40;
      background: rgba(0, 0, 0, 0.75);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
      height: 64px;
      display: flex;
      align-items: center;
    }

    .navbar-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-light);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    /* Hero Section */
    .hero-section {
      padding: 5rem 0 3.5rem 0;
      text-align: center;
    }

    .badge {
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      background: rgba(255, 255, 255, 0.1);
      backdrop-filter: blur(6px);
      -webkit-backdrop-filter: blur(6px);
      border: 1px solid rgba(255, 255, 255, 0.2);
      border-radius: 9999px;
      padding: 0.5rem 1rem;
      margin-bottom: 1.5rem;
      font-size: 0.875rem;
      font-weight: 500;
    }

    .badge svg {
      width: 1.125rem;
      height: 1.125rem;
      flex-shrink: 0;
    }

    .hero-title {
      font-size: 2.5rem;
      font-weight: 800;
      letter-spacing: -0.04em;
      margin-bottom: 1rem;
      background: linear-gradient(180deg, #FFFFFF 0%, rgba(255, 255, 255, 0.85) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    @media (min-width: 768px) {
      .hero-title {
        font-size: 3.5rem;
      }
    }

    @media (min-width: 1024px) {
      .hero-title {
        font-size: 4rem;
      }
    }

    .hero-subtitle {
      font-size: 1.125rem;
      color: var(--text-muted);
      max-width: 700px;
      margin: 0 auto;
      line-height: 1.6;
    }

    @media (min-width: 768px) {
      .hero-subtitle {
        font-size: 1.25rem;
      }
    }

    /* Cards Grid */
    .cards-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 1.75rem;
      margin-bottom: 4.5rem;
    }

    @media (min-width: 768px) {
      .cards-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (min-width: 1024px) {
      .cards-grid {
        grid-template-columns: repeat(3, 1fr);
      }
    }

    .card {
      background: var(--card-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--card-border);
      border-radius: 16px;
      padding: 1.75rem;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      gap: 1.5rem;
      box-shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.3), 0 8px 12px -6px rgba(0, 0, 0, 0.3);
      transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.4s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.3s ease;
      color: var(--text-dark);
      opacity: 0;
      transform: translateY(20px);
      animation: slideUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    }

    @keyframes slideUp {
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    .card:hover {
      transform: translateY(-8px) scale(1.02);
      box-shadow: 0 25px 40px -10px rgba(0, 0, 0, 0.5);
      border-color: var(--card-hover-border);
    }

    .card-header {
      display: flex;
      flex-direction: column;
      gap: 0.75rem;
    }

    .card-meta {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .card-icon {
      color: var(--text-dark);
      display: flex;
      align-items: center;
    }

    .card-icon svg {
      width: 3rem;
      height: 3rem;
    }

    .version-tag {
      font-size: 0.75rem;
      font-weight: 600;
      color: #374151;
      background: #f3f4f6;
      padding: 0.25rem 0.625rem;
      border-radius: 9999px;
    }

    .card-title {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--text-dark);
    }

    .card-desc {
      font-size: 0.95rem;
      color: #4b5563;
      line-height: 1.5;
    }

    .card-details {
      display: flex;
      flex-direction: column;
      gap: 0.5rem;
      font-size: 0.875rem;
      border-top: 1px solid rgba(0, 0, 0, 0.08);
      padding-top: 1rem;
    }

    .detail-row {
      display: flex;
      justify-content: space-between;
      color: #4b5563;
    }

    .detail-val {
      font-weight: 600;
      color: var(--text-dark);
      text-align: right;
      max-width: 60%;
    }

    /* Buttons */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      width: 100%;
      padding: 0.875rem;
      border-radius: 8px;
      font-size: 0.95rem;
      font-weight: 600;
      cursor: pointer;
      text-decoration: none;
      transition: background-color 0.2s ease, transform 0.1s ease, box-shadow 0.2s ease;
      border: none;
      outline: none;
    }

    .btn svg {
      width: 1.125rem;
      height: 1.125rem;
      flex-shrink: 0;
    }

    .btn-primary {
      background: var(--btn-bg);
      color: var(--text-light);
      box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.15), 0 2px 4px -1px rgba(0, 0, 0, 0.1);
    }

    .btn-primary:hover {
      background: var(--btn-hover);
    }

    .btn-disabled {
      background: #e5e7eb;
      color: #9ca3af;
      cursor: not-allowed;
      box-shadow: none !important;
    }

    /* Additional Info (Why Lupyd) */
    .info-section {
      margin-bottom: 4.5rem;
    }

    .info-card {
      background: var(--card-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--card-border);
      border-radius: 16px;
      padding: 2rem;
      box-shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.3);
      color: var(--text-dark);
    }

    .info-title {
      font-size: 1.5rem;
      font-weight: 700;
      text-align: center;
      margin-bottom: 2rem;
      color: var(--text-dark);
    }

    .info-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 1.75rem;
    }

    @media (min-width: 768px) {
      .info-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    .info-item {
      display: flex;
      flex-direction: column;
      gap: 0.5rem;
    }

    .info-item-title {
      font-size: 1.125rem;
      font-weight: 600;
      color: var(--text-dark);
    }

    .info-item-desc {
      font-size: 0.925rem;
      color: #4b5563;
      line-height: 1.5;
    }

    /* Footer */
    .footer {
      background: rgba(0, 0, 0, 0.85);
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding: 4rem 0 2rem 0;
      margin-top: auto;
    }

    .footer-logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--text-light);
      text-decoration: none;
    }

    .footer-desc {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 1.5rem;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .copyright {
      font-size: 0.75rem;
      color: var(--text-muted);
    }