:root {
  --bg: #1a1a1a;
  --accent: #4ade80;
  --text: #e5e7eb;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'JetBrains Mono', 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', 'Courier New', monospace;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  line-height: 1.4;
  font-size: 13px;
}

.container {
  background: var(--bg);
  border: 1px solid rgba(229, 231, 235, 0.1);
  border-radius: 16px;
  padding: 40px;
  max-width: 500px;
  width: 100%;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

header h1 {
  text-align: center;
  color: var(--text);
  margin-bottom: 28px;
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.form-group {
  margin-bottom: 24px;
}

.form-group > label {
  display: block;
  margin-bottom: 10px;
  font-weight: 500;
  color: var(--text);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.radio-group {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.radio-label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-weight: 400;
  font-size: 0.75rem;
  transition: opacity 0.2s ease;
}

.radio-label:hover {
  opacity: 0.8;
}

.radio-label input[type="radio"] {
  accent-color: var(--accent);
  cursor: pointer;
}

.length-control {
  display: flex;
  align-items: center;
  gap: 16px;
}

#length, #wordCount {
  flex: 1;
  height: 6px;
  background: rgba(229, 231, 235, 0.2);
  border-radius: 8px;
  outline: none;
  accent-color: var(--accent);
  cursor: pointer;
  transition: opacity 0.2s ease;
}

#length:hover, #wordCount:hover {
  opacity: 0.8;
}

#lengthValue, #wordCountValue {
  font-weight: 500;
  color: var(--accent);
  min-width: 28px;
  text-align: center;
  background: rgba(74, 222, 128, 0.1);
  padding: 4px 8px;
  border-radius: 6px;
  border: 1px solid rgba(74, 222, 128, 0.2);
  font-size: 0.75rem;
}

.checkbox-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-weight: 400;
  font-size: 0.75rem;
  transition: opacity 0.2s ease;
}

.checkbox-label:hover {
  opacity: 0.8;
}

.checkbox-label input[type="checkbox"] {
  accent-color: var(--accent);
  transform: scale(1.1);
  cursor: pointer;
}

.separator-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  gap: 12px;
}

.generate-btn {
  width: 100%;
  background: var(--accent);
  color: var(--bg);
  border: none;
  padding: 14px;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s ease, transform 0.1s ease;
  font-family: inherit;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.generate-btn:hover {
  opacity: 0.9;
}

.generate-btn:active {
  transform: scale(0.98);
}

.result-section {
  margin-top: 32px;
}

.password-display {
  display: flex;
  gap: 12px;
}

#passwordOutput {
  flex: 1;
  padding: 12px;
  border: 1px solid rgba(229, 231, 235, 0.2);
  border-radius: 6px;
  font-family: inherit;
  font-size: 0.8rem;
  background: rgba(229, 231, 235, 0.05);
  color: var(--text);
  outline: none;
  transition: border-color 0.2s ease, opacity 0.2s ease;
  letter-spacing: 0.5px;
}

#passwordOutput:focus {
  border-color: var(--accent);
  opacity: 1;
}

#passwordOutput::placeholder {
  color: rgba(229, 231, 235, 0.5);
}

.copy-btn {
  background: rgba(229, 231, 235, 0.1);
  color: var(--text);
  border: 1px solid rgba(229, 231, 235, 0.2);
  padding: 12px 16px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 500;
  font-size: 0.75rem;
  transition: opacity 0.2s ease, transform 0.1s ease;
  font-family: inherit;
  white-space: nowrap;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.copy-btn:hover:not(:disabled) {
  opacity: 0.8;
}

.copy-btn:active:not(:disabled) {
  transform: scale(0.98);
}

.copy-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.copy-btn.copied {
  background: rgba(74, 222, 128, 0.15);
  border-color: rgba(74, 222, 128, 0.3);
  color: var(--accent);
}

@media (max-width: 600px) {
  body {
    padding: 16px;
  }
  
  .container {
    padding: 24px;
  }
  
  header h1 {
    font-size: 1.3rem;
    margin-bottom: 20px;
  }
  
  .radio-group {
    flex-direction: column;
    gap: 12px;
  }
  
  .checkbox-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  
  .separator-grid {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  
  .password-display {
    flex-direction: column;
  }
  
  .copy-btn {
    width: 100%;
  }

  .length-control {
    gap: 12px;
  }

  #lengthValue, #wordCountValue {
    min-width: 24px;
    padding: 3px 6px;
    font-size: 0.7rem;
  }
}

@media (max-width: 400px) {
  .container {
    padding: 20px;
  }
  
  .form-group {
    margin-bottom: 20px;
  }
  
  .generate-btn {
    padding: 12px;
    font-size: 0.75rem;
  }
  
  #passwordOutput {
    padding: 10px;
    font-size: 0.75rem;
  }
  
  .copy-btn {
    padding: 10px 12px;
    font-size: 0.7rem;
  }
}