:root {
  --primary-color: #2563eb;
  --primary-dark: #1e40af;
  --border-color: #e5e7eb;
  --text-secondary: #6b7280;
}

main {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 2rem 1.25rem;
}

.container {
  width: 100%;
  max-width: 500px;
}

.tool-card {
  background: white;
  border-radius: 8px;
  padding: 2rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  border: 1px solid var(--border-color);
}

input {
  width: 100%;
  padding: 0.9rem 1rem;
  font-size: 1rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  outline: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  font-family: inherit;
}

input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.btn-primary {
  width: 100%;
  margin-top: 1rem;
  padding: 0.9rem 1rem;
  font-size: 1rem;
  border: none;
  border-radius: 6px;
  background: var(--primary-color);
  color: white;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 6px rgba(37, 99, 235, 0.2);
}

.btn-primary:active {
  transform: translateY(0);
}

.hint {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-align: center;
}