/*
https://fontawesome.com/search?ip=classic&ic=free-collection
*/
* {
    box-sizing: border-box;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;
    background-color: #cbd3dc;
    color: #334155;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
}

header {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    color: white;
    text-align: center;
    padding: 40px 20px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.logo {
    width: 80px;
    height: auto;
    margin-bottom: 15px;
    transition: transform 0.3s ease;
}

header .logo:hover {
    transform: rotate(-5deg) scale(1.1);
}

header h1 {
    margin: 10px 0 30px;
    font-size: clamp(1.5rem, 5vw, 2.5rem);
    font-weight: 700;
    letter-spacing: -1px;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
}

nav ul li a {
    display: inline-block;
    padding: 8px 20px;
    background-color: rgba(255, 255, 255, 0.1);
    color: #e2e8f0;
    border-radius: 50px;
    font-weight: 500;
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

nav ul li a:hover {
    background-color: #ffffff;
    color: #0f172a;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

main {
    max-width: 1200px;
    margin: -30px auto 40px; 
    padding: 40px;
    background-color: #f8fafc;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
    position: relative;
    z-index: 10;
}

section {
    margin-bottom: 60px;
}

h2 {
    color: #1e293b;
    border-left: 5px solid #4f46e5;
    padding-left: 15px;
    font-size: 1.5rem;
    margin-bottom: 30px;
}

hr {
    border: 0;
    height: 1px;
    background: #e2e8f0;
    margin: 50px 0;
}

/* --- Buscador --- */
#contenedor-buscador {
    margin: 0 auto 50px;
    max-width: 600px;
    position: relative;
}

#buscador {
    width: 100%;
    padding: 15px 20px 15px 50px;
    font-size: 1rem;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    transition: all 0.3s ease;
}

#buscador:focus {
    outline: none;
    border-color: #4f46e5;
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

.icono-buscar {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: #94a3b8;
}


.caja_practicas {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 25px;
}

.cajas_imagenes {
    display: block;
    text-decoration: none;
    background-color: #ffffff;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid #e2e8f0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.cajas_imagenes:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
    border-color: #4f46e5;
    background-color: #D3D3D3;
}

.cajas_imagenes:hover .icon-box {
    background-color: transparent;
    border-color: transparent;
}

.cajas_imagenes.bloqueado {
    opacity: 0.6;
    background-color: #f1f5f9;
}

.cajas_imagenes figure {
    margin: 0;
    height: 100%;
    display: flex;
    flex-direction: column;
}


.icon-box {
    height: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #f1f5f9; 
    transition: background-color 0.3s ease;
}

.icon-box i {
    font-size: 3.5rem;
    color: #64748b;
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.cajas_imagenes:hover .icon-box i {
    transform: scale(1.2);
}

.html i { color: #e34c26; }        
.css i { color: #264de4; }         
.js i { color: #f0db4f; }          
.teorico i { color: #0891b2; }     
.forms i { color: #8b5cf6; }       
.juego i { color: #ef4444; }       
.importante i { color: #dc2626; }  
.locked i { color: #cbd5e1; }     
.path i {color: #ff00ff;} 

/* Texto de la tarjeta */
.cajas_imagenes figcaption {
    padding: 15px;
    text-align: center;
    font-weight: 600;
    color: #334155;
    font-size: 0.95rem;
    border-top: 1px solid #f1f5f9;
    background: white;
}

.cajas_imagenes:hover figcaption {
    color: #4f46e5;
}

/* --- Botón Modo Oscuro --- */
#boton-tema {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(255,255,255,0.15);
    border: none;
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    backdrop-filter: blur(4px);
    transition: 0.5s;
}

#boton-tema:hover {
    background: rgba(255,255,255,0.3);
}

/* --- FOOTER --- */
footer {
    text-align: center;
    padding: 20px 20px;
    color: #4d5d73;
    font-size: 0.9rem;
    border-top: #f1f5f9 solid 1px;
}

footer a {
    color: #4f46e5;
    text-decoration: none;
    font-weight: 600;
}

footer img{
    width: 2%;
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    display: inline-block;
    margin:auto;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

footer img:hover{
    transform: translateY(-2px);
}

.social-links {
    margin-top: 15px;
    font-size: 1.5rem;
}

.social-links a {
    margin: 0 10px;
    color: #94a3b8;
    transition: color 0.3s;
}

.social-links a:hover {
    color: #4f46e5;
}

/* --- MODO OSCURO --- */
body.modo-oscuro {
    background-color: #0f172a;
    color: #cbd5e1;
}

body.modo-oscuro main {
    background-color: #1e293b;
    box-shadow: none;
}

body.modo-oscuro h2 {
    color: #f8fafc;
    border-left-color: #818cf8;
}

body.modo-oscuro .cajas_imagenes {
    background-color: #334155;
    border-color: #475569;
}

body.modo-oscuro .icon-box {
    background-color: #0f172a; 
}

body.modo-oscuro .icon-box:hover {
    background-color: #d3d3d3; 
}

body.modo-oscuro #buscador {
    background-color: #1e293b;
    border-color: #475569;
    color: white;
}
body.modo-oscuro #buscador:focus {
    border-color: #818cf8;
    box-shadow: 0 0 0 4px rgba(129, 140, 248, 0.1);
}