:root {
    --color-primario: #4ECDC4;    
    --color-secundario: #FF6B6B; 
    --color-fondo: #F7FFF7;      
    --color-texto: #2D3436;     
    --color-pie: #1A535C;         
    --fuente-titulos: 'Fredoka', sans-serif;
    --fuente-cuerpo: 'Nunito', sans-serif;
}

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

body {
    font-family: var(--fuente-cuerpo);
    background-color: var(--color-fondo);
    color: var(--color-texto);
    line-height: 1.6;
}

header {
    background-color: var(--color-primario);
    color: white;
    padding: 2rem;
    text-align: center;
    border-bottom: 5px solid rgba(0,0,0,0.1);
}

header h1 {
    font-family: var(--fuente-titulos);
    font-size: 3rem;
    text-shadow: 2px 2px 0px rgba(0,0,0,0.1);
}

nav {
    background-color: #fff;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav ul {
    display: flex;
    justify-content: center;
    list-style: none;
    padding: 1rem;
}

nav a {
    text-decoration: none;
    color: var(--color-texto);
    font-weight: 700;
    margin: 0 15px;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    transition: all 0.3s ease;
}

nav a:hover {
    background-color: var(--color-secundario);
    color: white;
}

main {
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 20px;
}

.hero {
    display: flex;
    align-items: center;
    background-color: white;
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.05);
    margin-bottom: 40px;
}

.hero-texto { width: 50%; padding-right: 20px; }
.hero-imagen { width: 50%; text-align: center; }

.hero-imagen img {
    width: 100%;
    max-width: 400px;
    border-radius: 20px;
    border: 5px solid var(--color-primario);
    box-shadow: 10px 10px 0px var(--color-secundario);
}

h2.seccion-titulo {
    text-align: center;
    font-family: var(--fuente-titulos);
    color: var(--color-pie);
    font-size: 2rem;
    margin-bottom: 30px;
}

.grid-cursos {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.tarjeta {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
    border-bottom: 5px solid var(--color-primario);
}

.tarjeta:hover { transform: translateY(-10px); }

.tarjeta img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.contenido-tarjeta { padding: 20px; text-align: center; }

.boton {
    display: inline-block;
    margin-top: 15px;
    padding: 10px 20px;
    background-color: var(--color-primario);
    color: white;
    text-decoration: none;
    border-radius: 25px;
    font-weight: bold;
}

footer {
    background-color: var(--color-pie);
    color: white;
    text-align: center;
    padding: 2rem;
    margin-top: 50px;
}

@media (max-width: 768px) {
    .hero { flex-direction: column; text-align: center; }
    .hero-texto, .hero-imagen { width: 100%; }
    nav ul { flex-direction: column; align-items: center; gap: 10px; }
}