:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --background: #f8fafc;
    --surface: #ffffff;
    --border: #e2e8f0;
    --text: #1e293b;
  }
  
  body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background: var(--background);
    color: var(--text);
    line-height: 1.6;
    margin: 0;
    padding: 2rem;
  }
  
  .container {
    max-width: 800px;
    margin: 0 auto;
  }
  
  /* Form Styling */
  .form-card {
    background: var(--surface);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
  }
  
  .input-group {
    display: grid;
    gap: 1rem;
    margin-bottom: 1.5rem;
  }
  
  /* Calendar Entry Styling */
  .calendar-entry {
    display: flex;
    gap: 1rem;
    align-items: center;
    padding: 1rem;
    background: var(--background);
    border-radius: 8px;
    transition: all 0.2s ease;
    margin-bottom: 1rem;
  }
  
  .calendar-entry:hover {
    transform: translateY(-2px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  }
  
  /* Input Elements */
  input[type="text"],
  input[type="url"] {
    padding: 0.75rem;
    border: 2px solid var(--border);
    border-radius: 6px;
    width: 100%;
    transition: border-color 0.2s ease;
  }
  
  input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
  }
  
  /* Checkbox Styling */
  .checkbox-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }
  
  input[type="checkbox"] {
    width: 1.2em;
    height: 1.2em;
    accent-color: var(--primary);
  }
  
  /* Button Styling */
  .button {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
  }
  
  .primary-btn {
    background: var(--primary);
    color: white;
  }
  
  .primary-btn:hover {
    background: var(--primary-hover);
  }
  
  .secondary-btn {
    background: var(--background);
    border: 2px solid var(--border);
  }
  
  /* Result Display */
  #result {
    padding: 1.5rem;
    background: var(--surface);
    border-radius: 8px;
    margin-top: 1rem;
    border: 2px dashed var(--border);
  }
  
  #result a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
  }
  
  /* Responsive Design */
  @media (max-width: 640px) {
    .calendar-entry {
      flex-direction: column;
      align-items: stretch;
    }
    
    input[type="text"] {
      width: 100%;
    }
  }