/* @import url(https://fonts.googleapis.com/css?family=Oswald:300);
@import url(https://fonts.googleapis.com/css?family=Lato:300); */

@import url('https://fonts.googleapis.com/css2?family=Oswald:wght@300&family=Lato:wght@300');

/* ========================================
   VARIABLES
   ======================================== */
:root {
    --color-primario: #0a1929;
    --color-secundario: #6a0dad;
    --color-acento: #ffd700;
    --espaciado-base: 20px;
    --radio-bordes: 12px;
    --sombra-suave: 0 4px 6px rgba(0, 0, 0, 0.3);
    --color-fondo: #0d1b2a;
    --color-texto: #e0e0e0;

    --contenedor: 1200px;
}

/* ========================================
   ESTILOS GENERALES
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    scroll-behavior: smooth;
}

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

.logo,
h1,
h2,
h3 {
    font-family: Oswald;
}

h2 {
    text-align: center;
    margin: var(--espaciado-base) 0;
    color: var(--color-acento);
    font-size: 2.2em;
}

/* botón flecha arriba */

.scroll-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    background: black;
    color: white;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    text-decoration: none;
    cursor: pointer;
}

.scroll-top:hover {
    background: white;
    color: black;
}


/* ========================================
   PARTE 1: SELECTORES Y VARIABLES
   ======================================== */

/* HEADER */
header {
    background: linear-gradient(135deg, #000000, var(--color-primario));
    padding: var(--espaciado-base);
    box-shadow: var(--sombra-suave);
    text-align: right;
}

header h1,
.logo {
    color: var(--color-acento);
    font-size: 2em;
    margin-bottom: 15px;
    text-align: left;
}

/* nav */

header nav ul li {
    display: inline;
}

.nav-toggle {
    display: none;
}

.nav-toggle-icon {
    display: none;
}


/* 1.4 Pseudo-clases de interacción */
header nav a {
    color: var(--color-texto);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: var(--radio-bordes);
    transition: all 0.3s ease;
}

header nav a:hover {
    color: var(--color-acento);
    background-color: rgba(255, 215, 0, 0.1);
    text-decoration: underline;
}

header nav a:focus {
    outline: 2px solid var(--color-acento);
    outline-offset: 4px;
}

/* HERO SECTION */
.hero {
    /* background: linear-gradient(135deg, var(--color-primario), var(--color-secundario)); */
    background-image: url(https://images.unsplash.com/photo-1504333638930-c8787321eee0?q=80&w=1170&auto=format&fit=crop&ixlib=rb-4.1.0&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D);
    background-size: cover;
    text-align: center;
    padding: calc(var(--espaciado-base) * 4) var(--espaciado-base);
    margin-bottom: var(--espaciado-base);
}

.hero h2 {
    font-size: 3em;
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.7);
    color: white;
}

.hero p {
    font-size: 1.3em;
    margin-top: calc(var(--espaciado-base) / 2);
    color: rgba(255, 255, 255, 0.9);
}

/* 1.2 Selector hermano adyacente */
.hero+h2 {
    margin-top: calc(var(--espaciado-base) * 2);
}

/* ========================================
   PARTE 3: GRID LAYOUT
   ======================================== */

.galeria-galaxias {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--espaciado-base);
    padding: var(--espaciado-base);
    max-width: var(--contenedor);
    margin: 0 auto;
}

/* 1.2 Selector descendiente */
.galeria-galaxias h3 {
    color: var(--color-acento);
    font-size: 1.5em;
    margin-bottom: 10px;
}

.galaxia-card {
    background: rgba(10, 25, 41, 0.6);
    padding: var(--espaciado-base);
    border-radius: var(--radio-bordes);
    box-shadow: var(--sombra-suave);
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.galaxia-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.5);
    background: rgba(10, 25, 41, 0.8);
}

.galaxia-card p {
    margin: 10px 0;
}

.galaxia-card .categoria {
    display: block;
    font-size: 0.9em;
    color: rgba(255, 215, 0, 0.7);
    margin-top: 10px;
}

/* 1.3 Selector de atributo */
/* [class*="premium"] {
    border: 2px solid var(--color-acento);
} */

/* ========================================
   PARTE 2: PSEUDO-CLASES ESTRUCTURALES
   ======================================== */

/* 2.1 nth-child con even/odd */
.galaxia-card:nth-child(even) {
    background: rgba(15, 30, 50, 0.6);
}

.galaxia-card:nth-child(odd) {
    background: rgba(10, 25, 41, 0.6);
}

/* 2.2 nth-child con número específico */
.galaxia-card:nth-child(3) {
    border: 3px solid var(--color-secundario);
}

/* ========================================
   PARTE 4: FLEXBOX LAYOUT
   ======================================== */

.timeline-descubrimientos {
    display: flex;
    flex-wrap: wrap;
    gap: var(--espaciado-base);
    padding: var(--espaciado-base);
    max-width: var(--contenedor);
    margin: 0 auto;
}

/* 1.2 Selector hijo directo */
.timeline-descubrimientos>.evento {
    width: calc((100% - 40px) / 3);
    /* módulos idénticos*/
    background: rgba(106, 13, 173, 0.2);
    padding: calc(var(--espaciado-base) * 0.8);
    border-radius: var(--radio-bordes);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.evento:hover {
    transform: scale(1.05);
    box-shadow: var(--sombra-suave);
}

.evento h4 {
    color: var(--color-acento);
    font-size: 1.8em;
    margin-bottom: 8px;
}

.evento h5 {
    color: var(--color-secundario);
    font-size: 1.2em;
    margin-bottom: 8px;
}

.evento p {
    font-size: 0.95em;
    color: rgba(224, 224, 224, 0.9);
}

/* 2.3 first-of-type y last-of-type */
.evento:first-of-type {
    border-left: 4px solid var(--color-acento);
}

.evento:last-of-type {
    border-right: 4px solid #c0c0c0;
}

/* ========================================
   PARTE 5: OVERFLOW
   ======================================== */

.fichas-tecnicas {
    padding: var(--espaciado-base);
    max-width: var(--contenedor);
    margin: 0 auto;
}

.ficha {
    background: rgba(10, 25, 41, 0.5);
    margin-bottom: calc(var(--espaciado-base) * 1.5);
    padding: var(--espaciado-base);
    border-radius: var(--radio-bordes);
    box-shadow: var(--sombra-suave);
}

.ficha h4 {
    color: var(--color-acento);
    font-size: 1.8em;
    margin-bottom: calc(var(--espaciado-base) / 2);
}

/* 5.1 Overflow-y en descripciones */
.descripcion-larga {
    background: rgba(15, 30, 50, 0.5);
    padding: 15px;
    border-radius: 8px;
    margin-bottom: var(--espaciado-base);
    max-height: 200px;
    overflow-y: scroll;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.descripcion-larga::-webkit-scrollbar {
    width: 8px;
}

.descripcion-larga::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 4px;
}

.descripcion-larga::-webkit-scrollbar-thumb {
    background: var(--color-secundario);
    border-radius: 4px;
}

.descripcion-larga p {
    margin-bottom: 12px;
}

/* 5.2 Overflow-x en tablas */
.datos-tabla {
    background: rgba(106, 13, 173, 0.15);
    padding: 15px;
    border-radius: 8px;
    overflow-x: auto;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.datos-tabla table {
    width: 100%;
    min-width: 800px;
    border-collapse: collapse;
}

.datos-tabla th,
.datos-tabla td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.datos-tabla th {
    background: rgba(106, 13, 173, 0.3);
    color: var(--color-acento);
    font-weight: bold;
}

.datos-tabla td {
    color: var(--color-texto);
}

/* ========================================
   FOOTER
   ======================================== */

footer {
    background: var(--color-primario);
    padding: calc(var(--espaciado-base) * 1.5);
    text-align: center;
    margin-top: calc(var(--espaciado-base) * 2);
    box-shadow: 0 -4px 6px rgba(0, 0, 0, 0.3);
}

footer p {
    margin-bottom: 10px;
    color: rgba(224, 224, 224, 0.8);
}

footer a {
    color: var(--color-acento);
    text-decoration: none;
    transition: all 0.3s ease;
}

footer a:hover {
    color: white;
    text-decoration: underline;
}



@media (max-width: 768px) {

    /* flex - eventos */
    .timeline-descubrimientos>.evento {
        width: calc((100% - 40px) / 2);
    }


    header {
        text-align: left;
    }

    header nav ul li {
        display: block;
    }

    .navbar {
        padding: 0.75rem 0;
    }

    .nav-toggle-icon {
        display: block;
        position: absolute;
        top: 1.25rem;
        right: 20px;
        cursor: pointer;
        z-index: 1001;
    }

    .nav-toggle-icon span {
        display: block;
        width: 25px;
        height: 3px;
        background-color: var(--color-acento);
        margin-bottom: 5px;
        transition: all 0.3s ease;
        border-radius: 2px;
    }



    /* Transformación a X */
    #nav-toggle:checked+.nav-toggle-icon span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 6px);
    }

    #nav-toggle:checked+.nav-toggle-icon span:nth-child(2) {
        opacity: 0;
    }

    #nav-toggle:checked+.nav-toggle-icon span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -6px);
    }

    .menu {
        position: fixed;
        padding-top: 120px;
        top: 0px;
        left: -100%;
        width: 100%;
        height: 100vh;
        background-color: rgb(20, 13, 43);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 30px;
        transition: left 0.3s ease;
        font-size: 1.2rem;
        box-shadow: 0 5px 5px rgba(0, 0, 0, 0.1);
        z-index: 1;
    }

    #nav-toggle:checked~.menu {
        left: 0;
    }



    /* Cerrar el menú cuando se hace clic en un enlace */
    .menu a {
        display: block;
    }
}

/* ========================================
   PARTE 6: ESTILOS PÁGINA VIDEO
   ======================================== */

.hero-small {
    padding: calc(var(--espaciado-base) * 2) var(--espaciado-base);
    min-height: 250px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-page-content {
    max-width: var(--contenedor);
    margin: 0 auto;
    padding: var(--espaciado-base);
}

.video-container {
    width: 100%;
    margin-bottom: var(--espaciado-base);
    position: relative;
    padding-bottom: 56.25%;
    /* 16:9 Aspect Ratio */
    height: 0;
    overflow: hidden;
    border-radius: var(--radio-bordes);
    box-shadow: var(--sombra-suave);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.video-description {
    background: rgba(10, 25, 41, 0.6);
    padding: calc(var(--espaciado-base) * 1.5);
    border-radius: var(--radio-bordes);
    box-shadow: var(--sombra-suave);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.video-description h3 {
    color: var(--color-acento);
    font-size: 1.8em;
    margin-bottom: var(--espaciado-base);
    border-bottom: 2px solid var(--color-secundario);
    padding-bottom: 10px;
    display: inline-block;
}

.video-description p {
    margin-bottom: 15px;
    color: rgba(224, 224, 224, 0.9);
    font-size: 1.1em;
    line-height: 1.8;
    text-align: justify;
}

/* ========================================
   PARTE 7: ESTILOS LISTADO VIDEOS
   ======================================== */

.galaxia-card-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.card-image {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: var(--radio-bordes);
    margin-bottom: 10px;
}