:root {
    --colorprimario: #F8F9FA;
    --colorsecundario: #1B263B;
    --colorterciario: #D4AF37;
}

* {
    box-sizing: border-box;
}

html,
body {
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Ubuntu', sans-serif;
    background-color: var(--colorprimario);
    color: var(--colorprimario);
    overflow-x: hidden;
}

body.no-scroll {
    overflow: hidden;
}

main,
section,
header,
footer {
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
}

/* Error modal */

.error-modal {
    position: fixed;
    inset: 0;
    z-index: 10000;
    background: rgba(10, 16, 26, 0.58);
    backdrop-filter: blur(6px);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1.2rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

.error-modal.activo {
    opacity: 1;
    pointer-events: all;
}

.error-card {
    width: 100%;
    max-width: 420px;
    background: rgba(27, 38, 59, 0.96);
    border: 1px solid rgba(212, 175, 55, 0.32);
    border-radius: 26px;
    box-shadow: 0 22px 55px rgba(0,0,0,0.35);
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.1rem;
    text-align: center;
    transform: translateY(12px) scale(0.98);
    transition: transform 0.25s ease;
}

.error-modal.activo .error-card {
    transform: translateY(0) scale(1);
}

.error-icono {
    width: 68px;
    height: 68px;
    border-radius: 22px;
    background: linear-gradient(180deg, rgba(212, 175, 55, 0.96), rgba(212, 175, 55, 0.82));
    display: flex;
    justify-content: center;
    align-items: center;
}

.error-icono i {
    color: var(--colorsecundario);
    font-size: 2rem;
}

.error-contenido h3 {
    margin: 0 0 0.4rem;
    color: var(--colorprimario);
    font-size: 1.6rem;
    text-transform: uppercase;
}

.error-contenido p {
    margin: 0;
    color: rgba(248, 249, 250, 0.9);
    font-family: 'Quicksand', sans-serif;
    font-size: 1rem;
    line-height: 1.6;
    text-transform: none;
}

.btn-cerrar-error {
    margin-top: 0.4rem;
    background-color: var(--colorterciario);
    color: var(--colorsecundario);
    border: none;
    border-radius: 999px;
    padding: 0.85rem 2rem;
    font-size: 0.95rem;
    cursor: pointer;
    text-transform: uppercase;
    font-weight: 800;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-cerrar-error:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 18px rgba(0,0,0,0.25);
}

/* Menu overlay */

.menu-overlay {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: rgba(27, 38, 59, 0.96);
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.menu-overlay.activo {
    opacity: 1;
    pointer-events: all;
    transform: translateY(0);
}

.menu-overlay .fa-xmark {
    position: absolute;
    top: 1.2rem;
    right: 1.2rem;
    font-size: 2rem;
    color: var(--colorterciario);
    cursor: pointer;
}

.overlay-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
    text-align: center;
}

.overlay-content h2 {
    margin: 0 0 1rem;
    color: var(--colorprimario);
    font-size: clamp(2rem, 6vw, 3.5rem);
    text-transform: uppercase;
}

.overlay-content a {
    text-decoration: none;
    color: var(--colorprimario);
    font-size: clamp(1.2rem, 4vw, 2rem);
    padding: 0.75rem 1.5rem;
    border: 1px solid rgba(212, 175, 55, 0.35);
    border-radius: 999px;
    transition: transform 0.2s ease, background-color 0.2s ease, color 0.2s ease;
    text-transform: uppercase;
}

.overlay-content a:hover {
    background-color: var(--colorterciario);
    color: var(--colorsecundario);
    transform: translateY(-2px);
}

/* Menu top */

.MenuTop {
    background-color: var(--colorsecundario);
    display: flex;
    align-items: center;
    gap: 3%;
    padding: 15px;
}

.MenuTop i {
    color: var(--colorterciario);
    font-size: 200%;
    cursor: pointer;
}

.menustart {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0 1rem;
    min-width: 0;
}

.menustart h1 {
    margin: 0;
    color: var(--colorprimario);
    font-size: clamp(1.2rem, 4vw, 2rem);
    text-transform: uppercase;
    overflow-wrap: anywhere;
}

.menucenter {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 1.5rem;
    padding: 0 4%;
}

.menucenter a {
    text-decoration: none;
    color: var(--colorprimario);
    font-size: 1.05rem;
    text-transform: uppercase;
    transition: color 0.2s ease;
}

.menucenter a:hover {
    color: var(--colorterciario);
}

.menu-hambur {
    display: none;
    font-size: 1.1rem;
    color: var(--colorprimario);
    cursor: pointer;
    margin-left: auto;
}

/* Main */

main {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-image:
        linear-gradient(rgba(46, 55, 65, 0.82), rgba(46, 55, 65, 0.82)),
        url("../assets/img/mathematical-physical-formulas-against-background-260nw-2602477871copia.jpg");
    background-size: 900px auto;
    background-position: center top;
    background-repeat: repeat;
    background-attachment: scroll;
}

/* Hero */

.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 3rem;
    padding: 2rem 1rem;
    text-align: center;
}

.hero h2 {
    margin: 0;
    width: 100%;
    max-width: 100%;
    color: var(--colorprimario);
    letter-spacing: 3px;
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    line-height: 1.15;
    text-transform: uppercase;
    text-shadow: 2px 2px 8px rgba(0,0,0,0.6);
    overflow-wrap: break-word;
}

.hero p {
    margin: 0;
    max-width: 92vw;
    color: var(--colorprimario);
    letter-spacing: 1px;
    font-size: clamp(1rem, 2.5vw, 2rem);
    line-height: 1.5;
    text-transform: none;
    text-shadow: 1px 1px 6px rgba(0,0,0,0.6);
}

.hero .button-scroll {
    margin-top: 0.5rem;
}

.hero button,
.btn-form {
    position: relative;
    background-color: var(--colorterciario);
    color: var(--colorsecundario);
    border: none;
    border-radius: 999px;
    padding: 1rem 2.5rem;
    font-size: 1rem;
    cursor: pointer;
    overflow: hidden;
    text-transform: uppercase;
    font-weight: 700;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.hero button::after {
    content: "";
    position: absolute;
    top: 0;
    left: -75%;
    width: 50%;
    height: 100%;
    background: rgba(255,255,255,0.3);
    transform: skewX(-20deg);
    transition: 0.5s;
}

.hero button:hover::after {
    left: 125%;
}

.hero button:hover,
.btn-form:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 18px rgba(0,0,0,0.2);
}

/* Estadisticas */

.estadisticas {
    min-height: 50vh;
    width: 100%;
    padding: 3rem 1rem 5rem;
    display: flex;
    justify-content: center;
    align-items: center;
}

.estadisticas-inner {
    width: 100%;
    max-width: 1150px;
    display: flex;
    gap: 2rem;
    justify-content: center;
    align-items: stretch;
}

.estadisticas-inner div {
    background: linear-gradient(180deg, rgba(212, 175, 55, 0.96), rgba(212, 175, 55, 0.88));
    border-radius: 26px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    flex: 1;
    min-height: 290px;
    padding: 2.4rem 1.8rem;
    box-shadow: 0 14px 35px rgba(0,0,0,0.20);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1.2rem;
}

.estadisticas-inner div:hover {
    transform: translateY(-8px);
    box-shadow: 0 18px 38px rgba(0,0,0,0.28);
}

.estadisticas h3 {
    font-family: 'Quicksand', sans-serif;
    font-size: clamp(2.8rem, 5vw, 4.2rem);
    font-weight: 700;
    letter-spacing: -1px;
    color: var(--colorsecundario);
    margin: 0;
    line-height: 1;
}

.estadisticas p {
    font-family: 'Quicksand', sans-serif;
    font-size: 1.05rem;
    color: rgba(27, 38, 59, 0.95);
    text-align: center;
    font-weight: 600;
    margin: 0;
    line-height: 1.55;
    max-width: 20ch;
    text-transform: none;
}

.estadisticas-inner div i {
    font-size: 2.3rem;
    color: var(--colorsecundario);
    opacity: 0.85;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.estadisticas-inner div:hover i {
    transform: scale(1.08) rotate(4deg);
    opacity: 1;
}

/* Materias */

.materias {
    width: 100%;
    padding: 3rem 1rem 5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2.8rem;
}

.materias-titulo {
    width: 100%;
    max-width: 1150px;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
}

.materias-etiqueta {
    display: inline-block;
    align-self: center;
    padding: 0.45rem 1rem;
    border-radius: 999px;
    background: rgba(212, 175, 55, 0.15);
    border: 1px solid rgba(212, 175, 55, 0.35);
    color: var(--colorterciario);
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.materias-titulo h2 {
    margin: 0;
    color: var(--colorprimario);
    font-size: clamp(2rem, 5vw, 3.2rem);
    text-transform: uppercase;
}

.materias-titulo p {
    margin: 0 auto;
    max-width: 760px;
    color: var(--colorprimario);
    font-family: 'Quicksand', sans-serif;
    font-size: 1.05rem;
    font-weight: 500;
    line-height: 1.6;
    text-transform: none;
}

.materias-revista {
    width: 100%;
    max-width: 1150px;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.materia-feature {
    display: grid;
    grid-template-columns: 320px 1fr;
    align-items: stretch;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(212, 175, 55, 0.20);
    border-radius: 30px;
    overflow: hidden;
    box-shadow: 0 14px 35px rgba(0,0,0,0.18);
    backdrop-filter: blur(10px);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.materia-feature:hover {
    transform: translateY(-8px);
    box-shadow: 0 18px 42px rgba(0,0,0,0.25);
    border-color: rgba(212, 175, 55, 0.42);
}

.materia-feature.reverse {
    grid-template-columns: 1fr 320px;
}

.materia-feature.reverse .materia-imagen {
    order: 2;
}

.materia-feature.reverse .materia-info {
    order: 1;
}

.materia-imagen {
    position: relative;
    min-height: 100%;
    overflow: hidden;
}

.materia-imagen img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.45s ease;
}

.materia-feature:hover .materia-imagen img {
    transform: scale(1.04);
}

.materia-info {
    padding: 2.2rem 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.materia-kicker {
    display: inline-block;
    width: fit-content;
    padding: 0.4rem 0.9rem;
    border-radius: 999px;
    background: var(--colorterciario);
    color: var(--colorsecundario);
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.materia-info h3 {
    margin: 0;
    color: var(--colorprimario);
    font-size: clamp(1.7rem, 3vw, 2.4rem);
    line-height: 1.15;
    text-transform: none;
}

.materia-descripcion {
    margin: 0;
    color: var(--colorprimario);
    font-family: 'Quicksand', sans-serif;
    font-size: 1rem;
    font-weight: 500;
    line-height: 1.75;
    text-transform: none;
}

.materia-bloques {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.2rem;
    margin-top: 0.5rem;
}

.materia-bloque {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(212, 175, 55, 0.15);
    border-radius: 20px;
    padding: 1.2rem;
}

.materia-bloque h4 {
    margin: 0 0 0.9rem 0;
    color: var(--colorterciario);
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.materia-bloque p {
    margin: 0;
    color: var(--colorprimario);
    font-family: 'Quicksand', sans-serif;
    font-size: 0.98rem;
    line-height: 1.7;
    text-transform: none;
}

.materia-bloque ul {
    margin: 0;
    padding-left: 1.2rem;
    color: var(--colorprimario);
    font-family: 'Quicksand', sans-serif;
    font-size: 0.98rem;
    line-height: 1.8;
}

.materia-bloque li {
    margin-bottom: 0.2rem;
    text-transform: none;
}

/* Opiniones */

.opiniones {
    width: 100%;
    padding: 3rem 1rem 5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2.5rem;
}

.opiniones-titulo {
    text-align: center;
    max-width: 760px;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.opiniones-titulo h2 {
    margin: 0;
    color: var(--colorprimario);
    font-size: clamp(2rem, 5vw, 3.2rem);
    text-transform: uppercase;
}

.opiniones-titulo p {
    margin: 0;
    color: var(--colorprimario);
    font-family: 'Quicksand', sans-serif;
    font-size: 1.05rem;
    font-weight: 500;
    line-height: 1.6;
    text-transform: none;
}

.opiniones-grid {
    width: 100%;
    max-width: 1150px;
    display: grid;
    grid-template-columns: repeat(2, minmax(280px, 1fr));
    gap: 2rem;
}

.opinion-card {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(212, 175, 55, 0.18);
    border-radius: 26px;
    backdrop-filter: blur(10px);
    padding: 2.4rem 1.8rem;
    box-shadow: 0 14px 35px rgba(0,0,0,0.18);
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.opinion-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 18px 40px rgba(0,0,0,0.24);
    border-color: rgba(212, 175, 55, 0.4);
}

.opinion-card i {
    width: 68px;
    height: 68px;
    border-radius: 18px;
    background: linear-gradient(180deg, rgba(212, 175, 55, 0.96), rgba(212, 175, 55, 0.82));
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2rem;
    color: var(--colorsecundario);
}

.opinion-card p {
    margin: 0;
    color: var(--colorprimario);
    font-family: 'Quicksand', sans-serif;
    font-size: 1rem;
    font-weight: 500;
    line-height: 1.75;
    text-transform: none;
}

.opinion-card span {
    color: var(--colorterciario);
    font-family: 'Quicksand', sans-serif;
    font-size: 0.95rem;
    font-weight: 700;
    text-transform: uppercase;
}

/* Contacto */

.contacto {
    width: 100%;
    padding: 4rem 1rem 5rem;
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    border-top: 1px solid rgba(212, 175, 55, 0.25);
    scroll-margin-top: 30px;
}

.contacto.active {
    display: flex;
}

.contacto-texto {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    text-align: center;
}

.contacto-texto h2 {
    margin: 0;
    color: var(--colorprimario);
    font-size: clamp(2rem, 5vw, 3rem);
    text-transform: uppercase;
}

.contacto-texto p {
    margin: 0;
    color: var(--colorprimario);
    font-weight: 400;
    text-transform: none;
}

.formulario {
    width: 100%;
    max-width: 500px;
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
    background: rgba(255,255,255,0.05);
    padding: 3rem 1.5rem;
    border-radius: 15px;
    backdrop-filter: blur(10px);
}

.campo {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    width: 100%;
}

.campo label {
    color: var(--colorprimario);
    font-size: 0.95rem;
    text-transform: uppercase;
}

.campo input,
.campo select,
.campo textarea {
    width: 100%;
    padding: 0.9rem 1rem;
    border-radius: 8px;
    border: none;
    outline: none;
    font-family: 'Ubuntu', sans-serif;
    font-size: 1rem;
    text-transform: none;
}

.campo input:focus,
.campo select:focus,
.campo textarea:focus {
    outline: 2px solid var(--colorterciario);
}

.campo input.error,
.campo select.error {
    outline: 2px solid #ff5a5a;
}

/* Responsive */

@media screen and (max-width: 1020px) {
    main {
        background-size: 700px auto;
        background-position: center top;
        background-repeat: repeat;
        background-attachment: scroll;
    }

    .menucenter {
        display: none;
    }

    .menu-hambur {
        display: block;
    }

    .MenuTop {
        width: 100%;
        max-width: 100%;
        padding: 12px 14px;
        gap: 0.75rem;
    }

    .MenuTop i {
        font-size: 1.6rem;
    }

    .menustart {
        padding: 0;
        gap: 0.6rem;
    }

    .menustart h1 {
        font-size: clamp(1.1rem, 5vw, 1.45rem);
    }

    .hero {
        width: 100%;
        max-width: 100%;
        gap: 2rem;
        padding: 2rem 1rem;
        overflow-x: hidden;
    }

    .hero h2 {
        width: 100%;
        max-width: 94vw;
        font-size: clamp(2rem, 8vw, 3.4rem);
        letter-spacing: 1px;
        line-height: 1.15;
        text-align: center;
    }

    .hero p {
        max-width: 92vw;
        font-size: clamp(1rem, 4vw, 1.5rem);
        line-height: 1.5;
    }

    .estadisticas {
        width: 100%;
        min-height: auto;
        padding: 2rem 1rem 3rem;
    }

    .estadisticas-inner {
        flex-direction: column;
        gap: 1.5rem;
        width: 100%;
        max-width: 100%;
        align-items: center;
    }

    .estadisticas-inner div {
        width: 100%;
        max-width: 340px;
        min-height: 220px;
        padding: 1.8rem 1.2rem;
    }

    .estadisticas-inner div:hover {
        transform: translateY(-6px);
    }

    .estadisticas h3 {
        font-size: clamp(2.2rem, 8vw, 3rem);
    }

    .estadisticas p {
        font-size: 0.95rem;
        max-width: 24ch;
    }

    .materias {
        padding: 2rem 1rem 3rem;
        gap: 2rem;
    }

    .materias-titulo,
    .opiniones-titulo,
    .contacto-texto {
        padding: 0 0.5rem;
    }

    .materias-revista {
        max-width: 100%;
        gap: 1.5rem;
    }

    .materia-feature,
    .materia-feature.reverse {
        width: 100%;
        max-width: 340px;
        margin: 0 auto;
        grid-template-columns: 1fr;
    }

    .materia-feature.reverse .materia-imagen,
    .materia-feature.reverse .materia-info {
        order: initial;
    }

    .materia-imagen {
        height: 190px;
    }

    .materia-info {
        padding: 1.4rem 1rem;
    }

    .materia-info h3 {
        font-size: clamp(1.45rem, 7vw, 2rem);
        line-height: 1.2;
    }

    .materia-bloques {
        grid-template-columns: 1fr;
    }

    .materia-bloque {
        padding: 1rem;
    }

    .materia-descripcion,
    .materia-bloque p,
    .materia-bloque ul {
        font-size: 0.95rem;
    }

    .opiniones {
        padding: 2rem 1rem 3rem;
        gap: 2rem;
    }

    .opiniones-grid {
        grid-template-columns: 1fr;
        max-width: 340px;
    }

    .opinion-card {
        padding: 1.8rem 1.2rem;
    }

    .opinion-card:hover {
        transform: translateY(-6px);
    }

    .opiniones-titulo p,
    .opinion-card p {
        font-size: 0.95rem;
    }

    .formulario {
        max-width: 360px;
        padding: 2rem 1rem;
    }

    .error-card {
        padding: 1.8rem 1.2rem;
    }

    .error-contenido h3 {
        font-size: 1.4rem;
    }
}

@media screen and (max-width: 430px) {
    .hero h2 {
        font-size: clamp(1.8rem, 9vw, 2.4rem);
        letter-spacing: 0.5px;
        max-width: 92vw;
    }

    .hero button,
    .btn-form {
        width: 100%;
        max-width: 300px;
        padding: 0.9rem 1.4rem;
    }

    .estadisticas-inner div,
    .materia-feature,
    .opiniones-grid,
    .formulario {
        max-width: 320px;
    }

    .materia-imagen {
        height: 170px;
    }

    .opinion-card,
    .materia-info {
        padding: 1.3rem 1rem;
    }

    .overlay-content a {
        min-width: 240px;
    }
}