:root {
    --primary-color: #8b5cf6;
    --primary-hover: #7c3aed;
    --bg-color: #1a1b1e;
    --card-bg: #2a2b2e;
    --text-color: #e5e7eb;
    --text-secondary: #9ca3af;
    --border-color: #374151;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
    
    /* Password strength colors */
    --strength-weak: #ef4444;
    --strength-fair: #f59e0b;
    --strength-good: #10b981;
    --strength-strong: #6366f1;
  }
  
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.5;
  }
  
  .container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem 1rem;
  }
  
  header {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 2rem;
    gap: 0.5rem;
  }
  
  .shield-icon {
    color: var(--primary-color);
  }
  
  main {
    display: grid;
    gap: 2rem;
    grid-template-columns: 1fr;
  }
  
  @media (min-width: 768px) {
    main {
      grid-template-columns: repeat(2, 1fr);
    }
  }
  
  section {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
  }
  
  h1 {
    font-size: 1.5rem;
    font-weight: bold;
  }
  
  h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
  }
  
  .form-group {
    margin-bottom: 1rem;
  }
  
  label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-color);
  }
  
  input {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
    background-color: var(--bg-color);
    color: var(--text-color);
  }
  
  input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.2);
  }
  
  .password-input {
    display: flex;
    gap: 0.5rem;
  }
  
  .password-input input {
    flex: 1;
  }
  
  /* Password Strength Meter */
  .password-strength {
    margin-top: 0.5rem;
  }
  
  .strength-meter {
    height: 4px;
    background-color: var(--border-color);
    border-radius: 2px;
    margin-top: 0.25rem;
  }
  
  .strength-meter-fill {
    height: 100%;
    border-radius: 2px;
    transition: all 0.3s ease;
  }
  
  .strength-text {
    font-size: 0.75rem;
    margin-top: 0.25rem;
  }
  
  .weak { background-color: var(--strength-weak); }
  .fair { background-color: var(--strength-fair); }
  .good { background-color: var(--strength-good); }
  .strong { background-color: var(--strength-strong); }
  
  .icon-button {
    padding: 0.5rem;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
  }
  
  .icon-button:hover {
    background: var(--border-color);
    color: var(--text-color);
  }
  
  .submit-btn {
    width: 100%;
    padding: 0.625rem 1rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s ease;
  }
  
  .submit-btn:hover {
    background: var(--primary-hover);
  }
  
  .password-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }
  
  .password-item {
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 1rem;
    background-color: var(--bg-color);
  }
  
  .password-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
  }
  
  .password-item-title {
    font-weight: 500;
    font-size: 1.125rem;
  }
  
  .password-item-content {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .password-item-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .password-item-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
  }
  
  .password-item-value {
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }
  
  .copy-btn, .delete-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.25rem;
    color: var(--text-secondary);
  }
  
  .copy-btn:hover {
    color: var(--primary-color);
  }
  
  .delete-btn:hover {
    color: var(--strength-weak);
  }
  
  .website-link {
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }
  
  .website-link:hover {
    color: var(--primary-hover);
  }