:root {
    --primary-color: #ff4444;
    --secondary-color: #333;
    --accent-color: #555;
    --background-color: #f0f4f8;
    --card-background: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --transition-speed: 0.3s;
}

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

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    background: linear-gradient(135deg, var(--background-color) 0%, #e0e8f0 100%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    padding: 1.5rem;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin: 0;
}

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

.nav-bar li a {
    color: var(--secondary-color);
    text-decoration: none;
    padding: 0.75rem 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border-radius: 6px;
    transition: all var(--transition-speed) ease;
}

.nav-bar li a i {
    font-size: 1.1rem;
}

.nav-bar li a:hover {
    color: var(--primary-color);
    background-color: rgba(255, 68, 68, 0.1);
    transform: translateY(-2px);
}

.main-container {
    flex: 1;
    padding: 2rem 1rem;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    gap: 2rem;
}

aside {
    flex: 1;
    background: var(--card-background);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px var(--shadow-color);
}

article {
    flex: 3;
}

.fondo-imagen {
    background: var(--card-background);
    padding: 3rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px var(--shadow-color);
    margin-bottom: 2rem;
}

.fondo-imagen h2 {
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
    font-size: 2rem;
}

.fondo-imagen p {
    color: var(--accent-color);
    line-height: 1.8;
    font-size: 1.1rem;
}

footer {
    background: linear-gradient(135deg, var(--secondary-color) 0%, rgba(51, 51, 51, 0.9) 100%);
    color: white;
    padding: 2rem 1rem;
    margin-top: auto;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    text-align: center;  
    padding: 20px; 
    background-color: #333; 
    color: white; 
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

footer p {
    display: inline-block; 
    padding: 10px 20px; 
    background-color: #555; 
    border-radius: 10px; 
    color: white; 
}

@media (max-width: 1200px) {
    .header-content {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
    
    .nav-bar {
        gap: 1rem;
    }
    
    .main-container {
        flex-direction: column;
    }
    
    aside {
        margin-bottom: 2rem;
    }
}

@media (max-width: 768px) {
    .nav-bar {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .fondo-imagen {
        padding: 1.5rem;
    }
    
    aside {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 2rem;
    }
    
    .fondo-imagen {
        padding: 1rem;
    }
    
    aside {
        padding: 1rem;
    }
}