/*
* Secure Password Generator
* Enhanced CSS with modern design and responsive features
*/

:root {
    /* Color scheme */
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --success-color: #2ecc71;
    --warning-color: #f39c12;
    --light-color: #ecf0f1;
    --dark-color: #2c3e50;
    --card-bg: #ffffff;
    --text-color: #333333;
    
    /* Typography */
    --font-main: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-heading: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    
    /* Sizing */
    --border-radius: 8px;
    --box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
    --transition-speed: 0.3s;
  }
  
  /* CSS Reset and Base Styles */
  *,
  *::before,
  *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  
  html {
    font-size: 62.5%; /* 1rem = 10px */
    scroll-behavior: smooth;
  }
  
  body {
    font-family: var(--font-main);
    font-size: 1.6rem;
    line-height: 1.5;
    color: var(--text-color);
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    margin: 0;
    padding: 0;
  }
  
  /* Typography */
  h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
  }
  
  h1 {
    font-size: 3.2rem;
    font-weight: 700;
  }
  
  h2 {
    font-size: 2.4rem;
    font-weight: 600;
  }
  
  h3 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 1.2rem;
  }
  
  h4 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 1rem;
  }
  
  p {
    margin-bottom: 1.5rem;
  }
  
  a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: color var(--transition-speed) ease;
  }
  
  a:hover {
    color: var(--primary-color);
    text-decoration: underline;
  }
  
  /* Layout */
  .wrapper {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
  }
  
  header {
    text-align: center;
    padding: 2rem 0;
  }
  
  .subtitle {
    font-size: 1.8rem;
    color: var(--primary-color);
    opacity: 0.8;
    margin-top: -1rem;
  }
  
  main {
    padding: 2rem 0;
  }
  
  footer {
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
    font-size: 1.4rem;
    color: var(--primary-color);
  }
  
  /* Card Component */
  .card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin: 0 auto;
    max-width: 800px;
    overflow: hidden;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
  }
  
  .card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.2);
  }
  
  .card-header {
    background-color: var(--primary-color);
    color: white;
    padding: 2rem;
    position: relative;
  }
  
  .card-header h2 {
    color: white;
    margin: 0;
  }
  
  .card-body {
    padding: 3rem;
  }
  
  .card-footer {
    background-color: var(--light-color);
    padding: 2rem;
    text-align: center;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
  }
  
  /* Password Display */
  .password-container {
    position: relative;
    margin-bottom: 2rem;
  }
  
  #password {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    width: 100%;
    padding: 1.5rem;
    font-family: 'Courier New', monospace;
    font-size: 1.8rem;
    line-height: 1.4;
    color: var(--text-color);
    background-color: var(--light-color);
    border: 2px solid var(--primary-color);
    border-radius: var(--border-radius);
    resize: none;
    height: 8rem;
    overflow: auto;
    text-align: left;
    transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
  }
  
  #password:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.3);
  }
  
  .btn-copy {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 4rem;
    height: 4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background-color var(--transition-speed);
  }
  
  .btn-copy:hover,
  .btn-copy:focus {
    background-color: var(--primary-color);
    outline: none;
  }
  
  .btn-copy.success {
    background-color: var(--success-color);
  }
  
  .btn-copy:disabled {
    background-color: #ccc;
    cursor: not-allowed;
  }
  
  /* Strength Indicator */
  .strength-indicator {
    margin-bottom: 2.5rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem;
  }
  
  .strength-indicator label {
    font-weight: 600;
    min-width: 15rem;
  }
  
  progress {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    max-width: 30rem;
    height: 1rem;
    border-radius: 5px;
    overflow: hidden;
  }
  
  progress::-webkit-progress-bar {
    background-color: #eee;
    border-radius: 5px;
  }
  
  progress::-webkit-progress-value {
    background-color: var(--warning-color);
    transition: background-color var(--transition-speed), width var(--transition-speed);
  }
  
  progress.weak::-webkit-progress-value {
    background-color: var(--accent-color);
  }
  
  progress.medium::-webkit-progress-value {
    background-color: var(--warning-color);
  }
  
  progress.strong::-webkit-progress-value {
    background-color: var(--success-color);
  }
  
  progress.very-strong::-webkit-progress-value {
    background-color: #27ae60;
  }
  
  #strength-text {
    font-weight: 600;
    padding: 0.3rem 0.8rem;
    border-radius: 3px;
    color: white;
    background-color: #95a5a6;
  }
  
  #strength-text.weak {
    background-color: var(--accent-color);
  }
  
  #strength-text.medium {
    background-color: var(--warning-color);
  }
  
  #strength-text.strong {
    background-color: var(--success-color);
  }
  
  #strength-text.very-strong {
    background-color: #27ae60;
  }
  
  /* Error Message */
  .error {
    background-color: rgba(231, 76, 60, 0.1);
    color: var(--accent-color);
    border-left: 4px solid var(--accent-color);
    padding: 1rem 1.5rem;
    margin-bottom: 2rem;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    font-weight: 500;
    display: none;
  }
  
  .error.show {
    display: block;
  }
  
  /* Options Container */
  .options-container {
    margin-top: 3rem;
  }
  
  .length-option {
    margin-bottom: 2.5rem;
  }
  
  .length-option label {
    display: block;
    font-weight: 600;
    margin-bottom: 1rem;
  }
  
  .slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 0.8rem;
    background: #ddd;
    border-radius: 5px;
    outline: none;
    margin-bottom: 1rem;
  }
  
  .slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 2.2rem;
    height: 2.2rem;
    border-radius: 50%;
    background: var(--secondary-color);
    cursor: pointer;
    transition: background-color var(--transition-speed);
  }
  
  .slider::-moz-range-thumb {
    width: 2.2rem;
    height: 2.2rem;
    border-radius: 50%;
    background: var(--secondary-color);
    cursor: pointer;
    transition: background-color var(--transition-speed);
  }
  
  .slider::-webkit-slider-thumb:hover,
  .slider::-moz-range-thumb:hover {
    background: var(--primary-color);
  }
  
  .range-labels {
    display: flex;
    justify-content: space-between;
    font-size: 1.2rem;
    color: #666;
  }
  
  /* Character Options */
  .character-options {
    margin-bottom: 2.5rem;
  }
  
  .checkbox-group {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
  }
  
  .checkbox-container {
    display: flex;
    align-items: center;
  }
  
  .checkbox-container input[type="checkbox"] {
    margin-right: 1rem;
    width: 1.8rem;
    height: 1.8rem;
    cursor: pointer;
  }
  
  .checkbox-container label {
    cursor: pointer;
  }
  
  /* Advanced Options */
  .toggle-btn {
    background-color: transparent;
    color: var(--secondary-color);
    border: none;
    padding: 1rem 0;
    font-size: 1.6rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    transition: color var(--transition-speed);
  }
  
  .toggle-btn:hover,
  .toggle-btn:focus {
    color: var(--primary-color);
    text-decoration: underline;
    outline: none;
  }
  
  .advanced-options {
    margin-top: 2rem;
    padding: 2rem;
    background-color: #f8f9fa;
    border-radius: var(--border-radius);
    border: 1px solid #e9ecef;
    display: none;
  }
  
  .advanced-options.show {
    display: block;
  }
  
  .info-box {
    margin-top: 2rem;
    padding: 1.5rem;
    background-color: rgba(52, 152, 219, 0.1);
    border-left: 4px solid var(--secondary-color);
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
  }
  
  .info-box h4 {
    color: var(--secondary-color);
    margin-bottom: 1rem;
  }
  
  .info-box ul {
    margin-left: 2rem;
  }
  
  .info-box li {
    margin-bottom: 0.5rem;
  }
  
  /* Button Styles */
  .btn {
    display: inline-block;
    background-color: var(--secondary-color);
    color: white;
    font-size: 1.6rem;
    font-weight: 600;
    padding: 1.2rem 2.4rem;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color var(--transition-speed), transform var(--transition-speed);
  }
  
  .btn:hover,
  .btn:focus {
    background-color: var(--primary-color);
    transform: translateY(-2px);
    outline: none;
  }
  
  .btn:active {
    transform: translateY(0);
  }
  
  .btn i {
    margin-right: 0.8rem;
  }
  
  /* Responsive Styles */
  @media (max-width: 768px) {
    html {
      font-size: 55%;
    }
    
    .card {
      margin: 0 1rem;
    }
    
    .card-body {
      padding: 2rem;
    }
    
    .checkbox-group {
      grid-template-columns: 1fr;
    }
  }
  
  @media (max-width: 480px) {
    html {
      font-size: 50%;
    }
    
    h1 {
      font-size: 2.8rem;
    }
    
    .card-body {
      padding: 1.5rem;
    }
    
    .btn {
      width: 100%;
    }
  }