:root {
  --primary-color: #4a6ee0;
  --secondary-color: #6c84eb;
  --accent-color: #8a9ded;
  --text-color: #333333;
  --light-bg: #f5f7ff;
  --light-gray: #e0e5ff;
  --medium-gray: #ccd4f8;
  --dark-gray: #9aa5d8;
  --danger-color: #e74c3c;
  --warning-color: #f39c12;
  --success-color: #2ecc71;
  --info-color: #3498db;
  --border-radius: 8px;
  --box-shadow: 0 8px 24px rgba(149, 157, 165, 0.2);
  --transition-speed: 0.3s;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background-color: #f0f2fa;
  background-image: linear-gradient(135deg, #f5f7ff 0%, #e0e5ff 100%);
  color: var(--text-color);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  margin: 0;
}

.container {
  background-color: white;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  width: 100%;
  max-width: 480px;
  overflow: hidden;
  animation: fadeIn 0.5s ease-in-out;
  margin: 0 auto;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.tabs {
  display: flex;
  border-bottom: 1px solid var(--light-gray);
  background-color: var(--light-bg);
}

.tab {
  flex: 1;
  padding: 14px 8px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
  font-weight: 600;
  color: var(--text-color);
  position: relative;
  overflow: hidden;
  font-size: 15px;
}

.tab:hover {
  background-color: var(--light-gray);
}

.tab.active {
  color: var(--primary-color);
  background-color: white;
}

.tab.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: var(--primary-color);
}

.tab-content {
  display: none;
  padding: 22px;
}

.tab-content.active {
  display: block;
  animation: fadeIn 0.3s ease-in-out;
}

.option-group {
  margin-bottom: 20px;
}

.option-title {
  font-weight: 600;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
}

.option-title i {
  margin-right: 8px;
  color: var(--primary-color);
}

.algorithm-options {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}

.algorithm-option {
  flex: 1;
  min-width: 100px;
  background-color: var(--light-bg);
  border: 2px solid var(--light-gray);
  border-radius: var(--border-radius);
  padding: 10px;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
  text-align: center;
  font-weight: 500;
  font-size: 14px;
}

.algorithm-option:hover {
  background-color: var(--light-gray);
}

.algorithm-option.active {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  color: white;
}

.algorithm-option:hover {
  background-color: var(--light-gray);
}

.algorithm-option.active {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  color: white;
}

.algorithm-option:hover {
  background-color: var(--light-gray);
}

.algorithm-option.active {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  color: white;
}

.custom-options {
  background-color: var(--light-bg);
  border-radius: var(--border-radius);
  padding: 16px;
  margin-top: 16px;
  display: none;
}

.custom-options.visible {
  display: block;
  animation: fadeIn 0.3s ease-in-out;
}

.option-row {
  display: flex;
  align-items: center;
  margin-bottom: 12px;
}

.option-row:last-child {
  margin-bottom: 0;
}

.option-label {
  flex: 1;
  font-size: 14px;
}

.checkbox-wrapper {
  position: relative;
  display: inline-block;
  width: 42px;
  height: 24px;
}

.toggle {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--dark-gray);
  transition: 0.4s;
  border-radius: 34px;
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: 0.4s;
  border-radius: 50%;
}

.toggle:checked + .toggle-slider {
  background-color: var(--primary-color);
}

.toggle:checked + .toggle-slider:before {
  transform: translateX(18px);
}

.length-slider {
  flex: 1;
  margin-right: 0;
  height: 8px;
  -webkit-appearance: none;
  appearance: none;
  background-color: var(--medium-gray);
  border-radius: 10px;
  outline: none;
}

.length-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: var(--primary-color);
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.length-slider::-webkit-slider-thumb:hover {
  transform: scale(1.1);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

.length-slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: var(--primary-color);
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.length-slider::-moz-range-thumb:hover {
  transform: scale(1.1);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

.length-value {
  min-width: 40px;
  text-align: right;
  font-weight: 600;
  color: var(--primary-color);
  margin-left: 15px;
}

.result-container {
  margin-top: 20px;
  position: relative;
}

.result-input {
  width: 100%;
  padding: 12px 50px 12px 14px;
  border: 2px solid var(--light-gray);
  border-radius: var(--border-radius);
  font-size: 15px;
  color: var(--text-color);
  background-color: var(--light-bg);
  transition: all var(--transition-speed) ease;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.result-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(74, 110, 224, 0.2);
}

.pin-result {
  font-size: 24px;
  letter-spacing: 4px;
  text-align: center;
  font-family: "Courier New", monospace;
  font-weight: bold;
}

.copy-btn {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  border: none;
  color: var(--primary-color);
  font-size: 16px;
  cursor: pointer;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all 0.2s ease;
}

.copy-btn:hover {
  background-color: rgba(74, 110, 224, 0.1);
}

.generate-btn {
  display: block;
  width: 100%;
  padding: 14px;
  margin-top: 20px;
  background-color: var(--primary-color);
  color: white;
  border: none;
  border-radius: var(--border-radius);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
}

.generate-btn i {
  margin-right: 8px;
}

.generate-btn:hover {
  background-color: var(--secondary-color);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(74, 110, 224, 0.3);
}

.generate-btn:active {
  transform: translateY(0);
  box-shadow: none;
}

.strength-meter {
  margin-top: 20px;
  background-color: var(--light-bg);
  border-radius: var(--border-radius);
  padding: 16px;
}

.strength-title {
  font-weight: 600;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 15px;
}

.strength-label {
  font-weight: 600;
}

.strength-value {
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 14px;
}

.strength-bar {
  height: 8px;
  width: 100%;
  background-color: var(--medium-gray);
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: 16px;
}

.strength-progress {
  height: 100%;
  width: 0;
  transition: width 0.3s ease;
}

.strength-info {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.info-item {
  flex: 1;
  min-width: 140px;
  background-color: white;
  border-radius: var(--border-radius);
  padding: 12px;
  font-size: 14px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.info-label {
  color: var(--dark-gray);
  margin-bottom: 5px;
}

.info-value {
  font-weight: 600;
  color: var(--text-color);
}

.pin-options {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
}

.pin-option {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background-color: var(--light-bg);
  border: 2px solid var(--light-gray);
  border-radius: var(--border-radius);
  padding: 10px;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
  font-weight: 500;
  font-size: 14px;
}

.pin-option:hover {
  background-color: var(--light-gray);
}

.pin-option.active {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  color: white;
}

.passphrase-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 16px;
}

.passphrase-field {
  grid-column: 1 / -1;
  margin-bottom: 6px;
}

.select-wrapper {
  position: relative;
}

.select-wrapper::after {
  content: "\f107";
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--dark-gray);
  pointer-events: none;
}

select {
  width: 100%;
  padding: 10px 30px 10px 12px;
  border: 2px solid var(--light-gray);
  border-radius: var(--border-radius);
  background-color: white;
  appearance: none;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
  font-size: 14px;
}

select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(74, 110, 224, 0.2);
}

/* Toast notifications */
.toaster {
  position: fixed;
  top: 20px;
  right: 20px;
  max-width: 300px;
  z-index: 1000;
}

.toast {
  padding: 12px 16px;
  margin-bottom: 10px;
  border-radius: var(--border-radius);
  color: white;
  display: flex;
  align-items: center;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
  transform: translateX(120%);
  transition: transform 0.3s ease;
  cursor: pointer;
  font-size: 14px;
}

.toast.show {
  transform: translateX(0);
}

.toast i {
  margin-right: 10px;
  font-size: 16px;
}

.toast-success {
  background-color: var(--success-color);
}

.toast-error {
  background-color: var(--danger-color);
}

.toast-info {
  background-color: var(--info-color);
}

.toast-warning {
  background-color: var(--warning-color);
}

.footer {
  border-top: 1px solid var(--light-gray);
  padding: 14px 16px;
  text-align: center;
  color: var(--dark-gray);
  font-size: 14px;
  background-color: var(--light-bg);
  margin-top: 10px;
}

.footer a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer a:hover {
  color: var(--secondary-color);
  text-decoration: underline;
}

/* Responsive styles */
@media screen and (max-width: 480px) {
  .container {
    border-radius: var(--border-radius);
    max-width: 100%;
    display: flex;
    flex-direction: column;
    margin: 0;
    min-height: auto;
    max-height: 100vh;
  }

  .tab-content {
    flex: 1;
    overflow-y: auto;
    padding: 18px;
  }

  body {
    padding: 15px;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .passphrase-options {
    grid-template-columns: 1fr;
  }

  .algorithm-option {
    min-width: 80px;
    font-size: 13px;
    padding: 8px;
  }

  .pin-option {
    font-size: 13px;
    padding: 8px;
  }

  .option-label {
    font-size: 13px;
  }

  .tab {
    padding: 12px 5px;
    font-size: 14px;
  }

  .result-input {
    font-size: 14px;
    padding: 10px 40px 10px 12px;
  }

  .pin-result {
    font-size: 22px;
  }

  .footer {
    padding: 12px;
    font-size: 13px;
  }
}