:root {
    --primary-color: #10b981;
    --secondary-color: #059669;
    --bg-dark: #111827;
    --bg-card: #1f2937;
    --text-color: #e5e7eb;
    --text-muted: #9ca3af;
    --border-color: #374151;
    --accent-color: #f59e0b;
    
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    line-height: 1.5;
    font-weight: 400;
    
    color: var(--text-color);
    background-color: var(--bg-dark);
    
    font-synthesis: none;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }
  
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
  }
  
  #app {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    width: 100%;
  }
  
  header {
    text-align: center;
    margin-bottom: 1.5rem;
  }
  
  .logo {
    margin-bottom: 0.5rem;
  }
  
  .logo h1 {
    font-family: 'Bebas Neue', sans-serif;
    font-size: clamp(2.5rem, 8vw, 4rem);
    color: var(--text-color);
    letter-spacing: 2px;
    text-transform: uppercase;
  }
  
  .tagline {
    font-size: clamp(0.875rem, 4vw, 1.2rem);
    color: var(--text-muted);
    font-weight: 500;
  }
  
  .hero {
    text-align: center;
    margin-bottom: 1.5rem;
    padding: 0.75rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-color);
  }
  
  .signup-counter {
    font-size: clamp(0.875rem, 3vw, 1rem);
    margin-bottom: 0.75rem;
    color: var(--text-muted);
  }
  
  #signupCount {
    font-weight: 600;
    color: var(--primary-color);
  }
  
  .cta-banner {
    background-color: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    font-size: clamp(0.75rem, 2.5vw, 0.875rem);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: inline-block;
  }
  
  .signup-form {
    max-width: 600px;
    margin: 0 auto;
    padding: 1.5rem;
    background-color: var(--bg-card);
    border-radius: 8px;
    border: 1px solid var(--border-color);
  }
  
  .form-group {
    margin-bottom: 1.5rem;
  }
  
  label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-color);
    font-size: clamp(0.875rem, 3vw, 1rem);
  }
  
  input, select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: clamp(0.875rem, 3vw, 1rem);
    transition: border-color 0.3s, box-shadow 0.3s;
    background-color: var(--bg-dark);
    color: var(--text-color);
  }
  
  input:focus, select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
  }
  
  input::placeholder {
    color: var(--text-muted);
  }
  
  select[multiple] {
    height: 150px;
    padding: 0.5rem;
  }
  
  select[multiple] option {
    padding: 0.5rem;
    border-radius: 4px;
    background-color: var(--bg-dark);
    color: var(--text-color);
  }
  
  select[multiple] option:checked {
    background-color: var(--primary-color);
    color: white;
  }
  
  small {
    display: block;
    color: var(--text-muted);
    font-size: clamp(0.75rem, 2.5vw, 0.875rem);
    margin-top: 0.25rem;
  }
  
  .submit-btn {
    width: 100%;
    padding: 1rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: clamp(0.875rem, 3vw, 1.1rem);
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, background-color 0.3s;
    text-transform: uppercase;
    letter-spacing: 0.5px;
  }
  
  .submit-btn:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
  }
  
  .submit-btn:active {
    transform: translateY(0);
  }
  
  footer {
    margin-top: auto;
    text-align: center;
    padding: 1.5rem;
    color: var(--text-muted);
    font-size: clamp(0.75rem, 2.5vw, 0.875rem);
  }
  
  .footnote {
    margin-top: 0.25rem;
  }
  
  /* Responsive adjustments */
  @media (min-width: 768px) {
    #app {
      padding: 2rem;
    }
    
    .signup-form {
      padding: 2rem;
    }
  }
  
  @media (max-width: 320px) {
    #app {
      padding: 0.75rem;
    }
    
    .hero {
      padding: 0.5rem;
    }
    
    .signup-form {
      padding: 1rem;
    }
    
    .form-group {
      margin-bottom: 1rem;
    }
  }
  #app {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    width: 100%;
  }
  
  .dev-banner {
    background-color: var(--accent-color);
    color: var(--bg-dark);
    text-align: center;
    padding: 0.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    border-radius: 6px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    font-size: 0.9rem;
  }
  .success-message {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 999;
    align-items: center;
    justify-content: center;
  }
  
  .success-content {
    background-color: var(--bg-card);
    border: 2px solid var(--primary-color);
    border-radius: 8px;
    padding: 2rem;
    max-width: 90%;
    width: 500px;
    text-align: center;
  }
  
  .success-content h3 {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-bottom: 1rem;
  }
  
  .success-content p {
    margin-bottom: 1.5rem;
  }
  
  .close-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s;
  }
  
  .close-btn:hover {
    background-color: var(--secondary-color);
  }