/* VARIABLES  */
@font-face {
    font-family: 'Coolvetica';
    src: url('coolvetica.otf') format('opentype');
}

/*colores*/
:root {
    --color-primario: #073d67ed; 
    --color-secundario: #154b62ec;
    --color-terciario: #15344df0;
    --color-clarito: #055c9e8b;
    --color-texto: #f5f9fcf0;
    --color-oscuro:#022746;
    --color-menosclaro: #04345aa8;
}

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

/* Configuración del cuerpo */
body {
    font-family: 'Coolvetica';
    font-weight:lighter;
    letter-spacing: 1.4px; 
    background-image: url("fondo_scishark.webp");
    background-size: cover;
    background-position: center; 
    background-repeat: no-repeat;
    background-attachment: fixed; 
    color: var(--color--oscuro);
    transition: background-color 0.4s, color 0.4s;
}

/* HEADER */
header {
    background-color: var(--color-clarito);
    color: var(--color-texto);
    text-align: center;
    padding: 25px;
    font-size: 17px;
    font-weight: 55;
    letter-spacing: 2px;

}

.top-bar {
    display: flex;
    align-items: center;
    gap: 10px;
}

/*logitooo*/
.logo {
    width: 68px;
    height: auto;
    transition: transform 0.3s ease;
}

.logo:hover {
    transform: scale(1.3);
}

/* BUSCADOR */
.search {
    text-align: center;
    margin: 20px;

}

.search input {
    width: 60%;
    padding: 10px;
    border-radius: 20px;
    border: 1px solid var(--color-clarito);
    background-color: var(--color-clarito);
    color:var(--color-texto);

}
.search input::placeholder {
    color: var(--color--oscuro);
    font-weight: bold;
}

.search input:focus {
    outline: 3px solid var(--color-texto);
}

.search-box {
    position: relative;
    width: 60%;
    margin: 20px auto;
}

.search-box input {
    width: 100%;
    padding: 10px 40px 10px 15px;
    border-radius: 20px;
}

.search-box i {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    color: var(--color-secundario);
}

/* GRID */
.container {
    padding: 20px;
}

/* TARJETAS */
.cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    color: var(--color-oscuro);
    gap: 20px;
}

.card {
    background-color: var(--color-clarito);
    padding: 20px;
    border-radius: 20px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    color: var(--color--oscuro);
}

.card:hover {
    transform: scale(1.03);
    box-shadow: 0 10px 20px rgba(0,0,0,0.15);
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
}

.tag {
    display: flex;
    width: 30%;
    justify-content: center;
    padding: 5px 10px;
    border-radius: 10px;
    font-size: 12px;
    color: white;
}

/* TODAS las etiquetas con tu paleta */
.fisica { background: var(--color-menosclaro); }
.quimica { background: var(--color-menosclaro); }
.biologia { background: var(--color-menosclaro); }

/* BOTONES */
button {
    margin-top: 10px;
    background-color: var(--color-oscuro);
    color: var(--color-texto);
    border: none;
    padding: 10px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.25s ease;
}

button:hover {
    background-color: var(--color-oscuro);
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

button:active {
    transform: scale(0.97);
}

button:focus {
    outline: 3px solid var(--color-clarito);
    outline-offset: 3px;
}

/* ICONITO */
h1 i {
    margin-right: 10px;
    color: var(--color-texto);
}

/* RESPONSIVE */
@media (max-width: 640px) {
    .cards {
        grid-template-columns: 1fr;
    }

    .search input {
        width: 90%;
    }
}

@media (min-width: 768px) and (max-width: 1023px) {
    .cards {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* FOOTER */
footer{
    text-align:center;
    padding:20px;
    background-color: var(--color-primario);
    color: var(--color-texto);
    margin-top:500px;
}

/* BOTON LINK */
a.btn-primario {
    display: inline-block;
    margin-top: 10px;
    background-color: var(--color-menosclaro);
    color: var(--color-texto);
    padding: 10px;
    border-radius: 6px;
    text-decoration: none;
    transition: all 0.25s ease;
}

a.btn-primario:hover {
    background-color: var(--color-menosclaro);
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

a.btn-primario:focus {
    outline: 3px solid var(--color-primario);
    outline-offset: 3px;
}

/* CONTENIDO DEL TUTORIAL */
.tutorial {
    max-width: 900px;
    margin: 40px auto;
    padding: 20px;
    background-color: var(--color-clarito);
    border-radius: 20px;
}

/* TITULO */
.tutorial h1 {
    text-align: center;
    margin-bottom: 20px;
    color: var(--color-primario);
}

/* VIDEO */
.video {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}

.video iframe {
    width: 100%;
    max-width: 700px;
    border-radius: 15px;
}

/* DESCRIPCION */
.descripcion {
    margin-top: 20px;
}

.descripcion h2 {
    margin-bottom: 10px;
    color: var(--color-secundario);
}

.descripcion p {
    line-height: 1.6;
    color: var(--color--oscuro);
}

/* BOTON VOLVER */
.btn {
    display: inline-block;
    margin-top: 20px;
    background-color: var(--color-secundario);
    color: var(--color-texto);
    padding: 10px 15px;
    border-radius: 8px;
    text-decoration: none;
}

.btn:hover {
    background-color: var(--color-terciario);
    transform: translateY(-3px);
}


/* RESPONSIVE */
@media (max-width: 640px) {
    .tutorial {
        margin: 20px;
        padding: 15px;
    }

    .video iframe {
        height: 200px;
    }
}

/* TRANSICIONES  */
a, button {
    transition: all 0.25s ease;
}

/* IMAGENES */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/*CAMBIO DE MODO*/ 

/* Funcionalidad modo oscuro CSS */
#modo-check {
    display: none;
}

/* Botón */
.btn-toggle {
    display: block;
    margin: 40px 0 10px 10%; 
    padding: 10px 20px;
    background-color: var(--color-oscuro);
    color: white;
    border-radius: 8px;
    cursor: pointer;
    width: fit-content;
    transition: 0.3s;
}

.btn-toggle:hover {
    background-color: var(--color-secundario);
}

/* activar modo oscuro */
body:has(#modo-check:checked) {
    background-color: #2f5e91;
    background-image: url("fondo_scishark.webp");
}

/*  TEXTO NEGRO */
body:has(#modo-check:checked) h1,
body:has(#modo-check:checked) h2,
body:has(#modo-check:checked) p,
body:has(#modo-check:checked) a,
body:has(#modo-check:checked) h3,
body:has(#modo-check:checked) span,
body:has(#modo-check:checked) a,
body:has(#modo-check:checked) div,
body:has(#modo-check:checked) i,
body:has(#modo-check:checked) input

 {
    color: #0f0404df !important;
}

/* CARDS OSCURAS */
body:has(#modo-check:checked) .card {
    background-color: #10385881;
    color: white;
}