body {
    margin: 0;
    padding-top: 75px; /* Fixed header için */
    font-family: 'Poppins', sans-serif;
    background: #0F172A;
    color: #E2E8F0;
  }
  
  .main-header {
    background: rgba(30, 41, 59, 0.95);
    backdrop-filter: blur(10px);
    padding: 15px 0;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 15px rgba(0,0,0,0.3);
    transition: all 0.3s ease;
    border-bottom: 1px solid rgba(59, 130, 246, 0.2);
  }
  .main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 90%;
    margin: auto;
  }
  .main-header a {
    text-decoration: none;
    color: #3B82F6;
    font-weight: 600;
    transition: color 0.3s ease;
  }
  
  .main-header a:hover {
    color: #60A5FA;
  }
  .main-header ul {
    display: flex;
    list-style: none;
    gap: 20px;
  }
  
  .hero {
    position: relative;
    height: 85vh;
    background: linear-gradient(135deg, #1E293B, #0F172A, #334155);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 0 20px;
    overflow: hidden;
  }
  .hero-content {
    position: relative;
    z-index: 100;
    max-width: 700px;
    margin: 0 auto;
    width: 100%;
    text-align: center;
  }
  .hero-content h1 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    font-weight: 700;
    background: linear-gradient(90deg, #3B82F6, #60A5FA, #93C5FD);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-align: center;
  }
  .hero-content p {
    font-size: 1.1rem;
    color: #CBD5E1;
    margin-bottom: 25px;
    line-height: 1.6;
    text-align: center;
    margin-left: auto;
    margin-right: auto;
  }
  .hero .btn {
    background: linear-gradient(135deg, #3B82F6, #2563EB);
    color: #fff;
    padding: 12px 30px;
    border-radius: 30px;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
    font-weight: 500;
  }
  .hero .btn:hover {
    background: linear-gradient(135deg, #60A5FA, #3B82F6);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
  }
  
  .features, .pricing {
    padding: 80px 0;
  }
  .features h2, .pricing h2 {
    text-align: center;
    color: #60A5FA;
    margin-bottom: 40px;
    font-weight: 600;
  }
  .grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    width: 90%;
    margin: auto;
  }
  
  /* Features için 3 sütunlu grid */
  .features .grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    max-width: 1200px;
  }
  .card, .paket {
    background: linear-gradient(145deg, #1E293B, #334155);
    padding: 25px;
    border-radius: 15px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    border: 1px solid rgba(59, 130, 246, 0.1);
  }
  .card:hover, .paket:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 30px rgba(59, 130, 246, 0.2);
    border-color: rgba(59, 130, 246, 0.3);
  }
  .price {
    font-size: 1.8rem;
    color: #60A5FA;
    font-weight: 700;
  }
  .paket.premium {
    border: 2px solid #3B82F6;
    background: linear-gradient(145deg, #1E293B, #2563EB15);
    position: relative;
  }
  
  .paket.premium::before {
    content: 'EN POPÜLER';
    position: absolute;
    top: -10px;
    right: 20px;
    background: linear-gradient(135deg, #3B82F6, #2563EB);
    color: white;
    padding: 5px 15px;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
  }
  /* Partikül canvas pozisyonlama */
  .particle-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
  }

  /* Fade-in animasyonu */
  section {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.8s ease-out;
  }

  section.visible {
    opacity: 1;
    transform: translateY(0);
  }

  /* Container sınıfı */
  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
  }

  /* Responsive düzeltmeler */
  @media (max-width: 768px) {
    body {
      padding-top: 65px;
    }
    
    .hero {
      height: 70vh;
      padding: 0 15px;
    }
    
    .hero-content h1 {
      font-size: 2rem;
    }
    
    .hero-content p {
      font-size: 1rem;
    }
    
    .main-header .container {
      width: 95%;
    }
    
    .grid {
      grid-template-columns: 1fr;
      width: 95%;
    }
    
    .features, .pricing {
      padding: 60px 0;
    }
  }

  @media (max-width: 480px) {
    .hero-content h1 {
      font-size: 1.6rem;
    }
    
    .hero-content p {
      font-size: 0.9rem;
    }
    
    .main-header ul {
      gap: 15px;
    }
    
    .card, .paket {
      padding: 20px;
    }
  }

  footer {
    background: #0F172A;
    border-top: 1px solid rgba(59, 130, 246, 0.2);
    text-align: center;
    padding: 20px 0;
    color: #94A3B8;
  }