:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --border: #30363d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --accent: #58a6ff;
  --accent-hover: #79b8ff;
  --success: #3fb950;
  --warning: #d29922;
  --danger: #f85149;
}

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

body {
  font-family: 'Outfit', system-ui, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background-image: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(88, 166, 255, 0.08), transparent),
    radial-gradient(ellipse 60% 40% at 100% 100%, rgba(63, 185, 80, 0.05), transparent);
}

.container {
  width: 100%;
  max-width: 420px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

@media (min-width: 768px) {
  .container {
    max-width: 640px;
  }
}

h1 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  text-align: center;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 0.9rem;
  text-align: center;
  margin-bottom: 1.5rem;
}

.password-field-wrapper {
  margin-bottom: 0.5rem;
}

.password-field {
  width: 100%;
  font-family: 'JetBrains Mono', monospace;
  font-size: 1rem;
  padding: 0 1rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  letter-spacing: 0.05em;
  height: 51px;
  text-align: center;
}

.password-field::placeholder {
  color: var(--text-secondary);
}

.btn {
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0 1rem;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s ease;
  height: 51px;
  flex-shrink: 0;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--border);
}

.button-row {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.button-row .btn {
  flex: 1;
  height: 51px;
}

.btn-copy {
  min-width: 80px;
}

.btn-copy.copied {
  background: var(--success);
  color: #fff;
  border-color: var(--success);
}

.settings {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.5rem;
}

.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.setting-label {
  font-size: 0.95rem;
}

.length-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  color: var(--accent);
  min-width: 2ch;
}

input[type="range"] {
  flex: 1;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--bg-tertiary);
  border-radius: 3px;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  transition: transform 0.15s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.1);
}

.checkbox-group {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  font-size: 0.95rem;
  user-select: none;
}

.checkbox-label input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
  cursor: pointer;
}

.footer {
  margin-top: 2rem;
  text-align: center;
}

.footer a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  text-decoration: none;
  transition: color 0.15s ease;
}

.footer a:hover {
  color: var(--accent);
}