:root {
  
  --bg-color: #f8f9fa;        
  --text-color: #333333;      
  --primary-color: #2c3e50;   
  --secondary-color: #3498db; 
  --footer-bg: #e9ecef;       
  --white: #ffffff;
  
  --font-main: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-size-base: 16px;
  --line-height: 1.6;         
}

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

body {
  font-family: var(--font-main);
  font-size: var(--font-size-base);
  line-height: var(--line-height);
  color: var(--text-color);
  background-color: var(--bg-color);
  
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header {
  background-color: var(--primary-color);
  color: var(--white);
  padding: 1.5rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1); 
}

header h1 {
  font-size: 1.8rem;
  margin: 0;
}

nav ul {
  list-style: none; 
  display: flex;
  gap: 1.5rem;      
}

nav a {
  color: var(--white);
  text-decoration: none;
  font-weight: 500;
  padding: 0.5rem;
}

nav a:hover {
  color: var(--secondary-color);
}


main {
  flex: 1;
  max-width: 900px; 
  margin: 2rem auto; 
  padding: 2rem;
  background-color: var(--white);
  border-radius: 8px; /* Bordes redondeados */
  box-shadow: 0 2px 10px rgba(0,0,0,0.05); 
}

main p {
  margin-bottom: 1.5rem; 
  text-align: justify;   
}

main img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  display: block;
  margin: 1.5rem auto;
}


footer {
  background-color: var(--footer-bg);
  color: var(--text-color);
  text-align: center;
  padding: 1.5rem;
  font-size: 0.9rem;
  border-top: 1px solid #ccc;
}