* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  html {
    scroll-behavior: smooth;
  }
  
  body {
    font-family: -apple-system, BlinkMacSystemFont, sans-serif;
    color: white;
    line-height: 1.6;
    background:
      radial-gradient(circle at top left, rgba(139,92,246,0.28), transparent 28%),
      radial-gradient(circle at top right, rgba(59,130,246,0.22), transparent 30%),
      linear-gradient(180deg, #0f172a 0%, #111827 45%, #0f172a 100%);
    background-attachment: fixed;
  }
  
  /* Header */
  .site-header {
    width: 100%;
    padding: 24px 8%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    backdrop-filter: blur(12px);
    background: rgba(15, 23, 42, 0.7);
    border-bottom: none;
    z-index: 100;
    transition: transform 0.3s ease;
  }
  
  .logo {
    text-decoration: none;
    color: white;
    font-size: 1.4rem;
    font-weight: 700;
  }
  
  .logo span {
    color: #8b5cf6;
  }
  
  nav {
    display: flex;
    gap: 24px;
  }
  
  nav a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    font-weight: 700;
    font-size: 1rem;
    transition: 0.3s;
  }

  nav {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
  }

  nav a:hover {
    color: white;
  }
  
  /* Hero */
  .hero {
    min-height: auto;
    padding: 90px 8% 70px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
    overflow: hidden;
    background: transparent;
  }
  
  .badge {
    padding: 10px 18px;
    border-radius: 999px;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.08);
    margin-bottom: 24px;
    font-size: 0.95rem;
  }
  
  .hero h1 {
    font-size: 4rem;
    max-width: 900px;
    line-height: 1.1;
    margin-bottom: 24px;
  }
  
  .hero-text {
    max-width: 700px;
    font-size: 1.2rem;
    color: rgba(255,255,255,0.7);
    margin-bottom: 42px;
  }
  
  /* Tool */
  .tool-card {
    width: 100%;
    max-width: 700px;
    padding: 40px;
    border-radius: 28px;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.08);
    backdrop-filter: blur(14px);
  }
  
  .invisible-box {
    width: 100%;
    height: 90px;
    border-radius: 20px;
    background: rgba(255,255,255,0.04);
    border: 1px dashed rgba(255,255,255,0.12);
    margin-bottom: 24px;
    font-size: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  
  .primary-button {
    width: 100%;
    padding: 18px;
    border: none;
    border-radius: 18px;
    background: linear-gradient(135deg, #8b5cf6, #6366f1);
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: 0.3s;
  }
  
  .primary-button:hover {
    transform: translateY(-2px);
    opacity: 0.95;
  }
  
  .copy-message {
    margin-top: 18px;
    color: rgba(255,255,255,0.7);
    font-size: 0.95rem;
  }
  
  .generator-box {
    display: flex;
    gap: 12px;
    margin-top: 20px;
  }
  
  .generator-box input {
    flex: 1;
    padding: 16px;
    border-radius: 14px;
    border: 1px solid rgba(255,255,255,0.1);
    background: rgba(255,255,255,0.05);
    color: white;
    font-size: 16px;
    outline: none;
  }
  
  .generator-box button {
    padding: 16px 24px;
    border: none;
    border-radius: 14px;
    background: linear-gradient(90deg,#7c5cff,#6d6dff);
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: 0.2s ease;
  }
  
  .generator-box button:hover {
    transform: translateY(-2px);
  }
  
  textarea {
    width: 100%;
    margin-top: 24px;
    min-height: 140px;
    border-radius: 18px;
    border: 1px solid rgba(255,255,255,0.08);
    background: rgba(255,255,255,0.04);
    color: white;
    padding: 18px;
    resize: none;
    font-size: 1rem;
  }
  
  textarea::placeholder {
    color: rgba(255,255,255,0.4);
  }
  
  /* Sections */
  .section {
    padding: 70px 8%;
    background: transparent;
  }
  
  .section h2 {
    font-size: 2.6rem;
    margin-bottom: 16px;
    text-align: center;
  }
  
  .section-intro {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 42px;
    color: rgba(255,255,255,0.7);
  }
  
  /* Cards */
  .grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
  
  .card,
  .step {
    padding: 28px;
    border-radius: 24px;
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
  }
  
  .card h3,
  .step h3 {
    margin-bottom: 10px;
  }
  
  .card p,
  .step p {
    color: rgba(255,255,255,0.7);
  }
  
  /* Steps */
  .steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 36px;
  }
  
  .step span {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: #8b5cf6;
    font-weight: bold;
    margin-bottom: 20px;
  }
  
  /* FAQ */
  .faq {
    max-width: 900px;
    margin: auto;
    padding-top: 70px;
  }
  
  details {
    padding: 24px;
    border-radius: 20px;
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    margin-bottom: 20px;
  }
  
  summary {
    cursor: pointer;
    font-weight: 600;
    font-size: 1.05rem;
  }
  
  details p {
    margin-top: 16px;
    color: rgba(255,255,255,0.7);
  }
  
  /* Footer */
  footer {
    padding: 40px;
    text-align: center;
    color: rgba(255,255,255,0.5);
  }
  
  /* Mobile */
  @media (max-width: 900px) {
    .grid,
    .steps {
      grid-template-columns: 1fr;
    }
  }
  
  @media (max-width: 768px) {
    .site-header {
        padding: 20px 8%;
        position: sticky;
        top: 0;
      }
  
    nav {
      display: none;
    }
  
    .hero {
      padding: 42px 8% 44px;
    }
  
    .badge {
      margin-bottom: 18px;
      font-size: 0.85rem;
    }
  
    .hero h1 {
      font-size: 2.35rem;
      line-height: 1.1;
      margin-bottom: 16px;
    }
  
    .hero-text {
      font-size: 1rem;
      line-height: 1.7;
      margin-bottom: 28px;
    }
  
    .tool-card {
      padding: 24px;
      border-radius: 24px;
    }
  
    .generator-box {
      flex-direction: column;
    }
  
    .section {
      padding: 48px 8%;
    }
  
    .section h2 {
      font-size: 2rem;
    }
  
    .section-intro {
      margin-bottom: 28px;
    }
  
    .grid,
    .steps {
      gap: 18px;
      margin-top: 28px;
    }
  
    .card,
    .step {
      padding: 24px;
    }
  
    .faq {
      padding-top: 48px;
    }
  }
  .mobile-header-hidden {
    transform: translateY(-100%);
  }