:root {
      --primary: #6e44ff;
      --secondary: #b892ff;
      --accent: #00c2ff;
      --dark: #0f1028;
      --light: #f8f9ff;
      --gradient: linear-gradient(135deg, var(--primary), var(--accent));
    }

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

    body {
      font-family: 'Poppins', sans-serif;
      background-color: var(--dark);
      color: var(--light);
      overflow-x: hidden;
      line-height: 1.6;
      background: linear-gradient(rgba(15, 16, 40, 0.95), rgba(15, 16, 40, 0.95)), 
                  url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><rect fill="%230f1028" width="100" height="100"/><path fill="%23171a3d" d="M0 0L100 100" stroke-width="0.5"/></svg>');
      background-size: cover;
    }

    body, .navbar, .section-title, .card, .btn, input, textarea {
      font-family: 'Poppins', system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
    }

    /* Custom Scrollbar */
    ::-webkit-scrollbar {
      width: 8px;
    }

    ::-webkit-scrollbar-track {
      background: var(--dark);
    }

    ::-webkit-scrollbar-thumb {
      background: var(--gradient);
      border-radius: 10px;
    }

    /* Header Section */
    header {
      min-height: 60vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }

    header::before {
      content: '';
      position: absolute;
      top: -50%;
      left: -50%;
      width: 200%;
      height: 200%;
      background: radial-gradient(circle, var(--primary) 0%, transparent 70%);
      opacity: 0.1;
      animation: pulse 15s infinite alternate;
    }

    .hero-title {
      font-size: 3rem;
      font-weight: 800;
      background: var(--gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 1rem;
    }

    .hero-subtitle {
      font-size: 1.2rem;
      margin-bottom: 2rem;
      color: var(--secondary);
    }

    .btn-glow {
      background: var(--gradient);
      border: none;
      border-radius: 50px;
      padding: 10px 25px;
      color: white;
      font-weight: 600;
      position: relative;
      overflow: hidden;
      z-index: 1;
      transition: all 0.3s ease;
    }

    .btn-glow::before {
      content: '';
      position: absolute;
      top: 0;
      left: -100%;
      width: 100%;
      height: 100%;
      background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
      transition: all 0.6s ease;
      z-index: -1;
    }

    .btn-glow:hover::before {
      left: 100%;
    }

    .btn-glow:hover {
      box-shadow: 0 0 20px rgba(110, 68, 255, 0.7);
      transform: translateY(-3px);
    }

    /* Navigation */
    .navbar {
      background: rgba(15, 16, 40, 0.8) !important;
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(184, 146, 255, 0.1);
      transition: all 0.3s ease;
    }

    .navbar.scrolled {
      padding: 5px 0;
      box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    }

    .navbar-brand, .nav-link {
      color: var(--light) !important;
      font-weight: 500;
      transition: all 0.3s ease;
    }

    .nav-link {
      position: relative;
      margin: 0 10px;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--gradient);
      transition: all 0.3s ease;
      transform: translateX(-50%);
    }

    .nav-link:hover::after, .nav-link.active::after {
      width: 100%;
    }

    /* Content Section */
    section {
      padding: 80px 0;
      position: relative;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 2.5rem;
      text-align: center;
      position: relative;
      display: inline-block;
    }

    .section-title::after {
      content: '';
      position: absolute;
      bottom: -10px;
      left: 50%;
      transform: translateX(-50%);
      width: 80px;
      height: 4px;
      background: var(--gradient);
      border-radius: 2px;
    }

    .content-card {
      background: rgba(255, 255, 255, 0.05);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: 15px;
      padding: 25px;
      margin-bottom: 30px;
      transition: all 0.3s ease;
    }

    .content-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
      border-color: rgba(110, 68, 255, 0.3);
    }

    h1 {
      font-size: 2.5rem;
      color: var(--secondary);
      margin-bottom: 1.5rem;
    }

    h2 {
      font-size: 2rem;
      color: var(--secondary);
      margin: 2.5rem 0 1.5rem;
      padding-bottom: 0.5rem;
      border-bottom: 2px solid var(--primary);
    }

    h3 {
      font-size: 1.5rem;
      color: var(--accent);
      margin: 2rem 0 1rem;
    }

    p {
      margin-bottom: 1.2rem;
      text-align: justify;
    }

    /* Code Blocks */
    pre {
      border-radius: 10px;
      margin: 20px 0;
      padding: 20px;
      overflow-x: auto;
      background: #1a1b26 !important;
    }

    code {
      font-family: 'Fira Code', monospace;
      font-size: 0.9rem;
    }

    /* Image Placeholders */
    .img-placeholder {
      width: 100%;
      height: 300px;
      background: linear-gradient(45deg, #2d2f49, #3f4369);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 20px 0;
      color: var(--secondary);
      font-weight: 600;
      text-align: center;
      padding: 0; /* kurangi padding agar gambar bisa lebih besar */
      overflow: hidden; /* pastikan gambar tidak keluar */
    }

    .img-placeholder img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      display: block;
      margin: 0;
      padding: 10px; /* beri sedikit padding agar tidak mentok */
      box-sizing: border-box;
      background: none;
    }

    /* Table of Contents */
    .toc {
      position: sticky;
      top: 100px;
      background: rgba(255, 255, 255, 0.05);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: 15px;
      padding: 20px;
      margin-bottom: 30px;
    }

    .toc-title {
      font-size: 1.3rem;
      color: var(--secondary);
      margin-bottom: 15px;
      padding-bottom: 10px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .toc-list {
      list-style: none;
      padding: 0;
    }

    .toc-list li {
      margin-bottom: 8px;
    }

    .toc-list a {
      color: var(--light);
      text-decoration: none;
      transition: color 0.3s ease;
      display: block;
      padding: 5px 0;
      border-left: 3px solid transparent;
      padding-left: 10px;
    }

    .toc-list a:hover {
      color: var(--accent);
      border-left: 3px solid var(--accent);
    }

    /* Footer */
    footer {
      background: linear-gradient(to right, #0a0c20, #161a3d);
      padding: 30px 0;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
    }

    .social-links {
      margin-bottom: 20px;
    }

    .social-links a {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--gradient);
      color: white;
      margin: 0 10px;
      transition: all 0.3s ease;
    }

    .social-links a:hover {
      transform: translateY(-5px);
      box-shadow: 0 5px 15px rgba(110, 68, 255, 0.4);
    }

    /* Animations */
    @keyframes pulse {
      0% {
        transform: rotate(0deg) scale(1);
        opacity: 0.1;
      }
      50% {
        opacity: 0.15;
      }
      100% {
        transform: rotate(180deg) scale(1.2);
        opacity: 0.1;
      }
    }

    @keyframes float {
      0% {
        transform: translateY(0px);
      }
      50% {
        transform: translateY(-10px);
      }
      100% {
        transform: translateY(0px);
      }
    }

    .floating {
      animation: float 5s ease-in-out infinite;
    }

    /* Particle Background */
    #particles-js {
      position: absolute;
      width: 100%;
      height: 100%;
      top: 0;
      left: 0;
      z-index: -1;
    }

    /* Responsive Design */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.5rem;
      }
      
      .section-title {
        font-size: 2rem;
      }
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 2rem;
      }
      
      .hero-subtitle {
        font-size: 1rem;
      }
      
      section {
        padding: 60px 0;
      }
      
      .section-title {
        font-size: 1.8rem;
      }
      
      h1 {
        font-size: 2rem;
      }
      
      h2 {
        font-size: 1.7rem;
      }
      
      h3 {
        font-size: 1.3rem;
      }
    }