/* ========================================================= */
/* VARIABLES */
/* ========================================================= */
:root {
    --color-primario: #1f4586;
    --color-secundario: #1871ac;
    --color-terciario: #ffffff;
    
    --fondo-oscuro-base: #0e1e3b;
    --fondo-oscuro-superficie: #142a52;
    
    --color-blanco: #ffffff;
    
    --textura-fondo: url(../img/fondo.png);
}

/* ========================================================= */
/* 0. FONDO FIJO, BASE & TIPOGRAFÍA */
/* ========================================================= */

.fondo-fijo {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1; 
    
    background-image: var(--textura-fondo);
    background-position: center center;
    background-size: cover;
    background-repeat: no-repeat;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--color-terciario); 
    background-color: transparent; 
}

section, footer {
    background-color: var(--fondo-oscuro-base); 
}

.container {
    width: 90%;
    max-width: 1600px; 
    margin: 0 auto;
}

h1, h2, h3 {
    margin-bottom: 0.5em;
    color: var(--color-blanco); 
}

h2 {
    font-size: 3.2em; 
    text-align: center;
    margin-bottom: 15px;
    font-weight: 700;
}

.subtitle {
    text-align: center;
    color: var(--color-terciario); 
    margin-bottom: 70px; 
    font-size: 1.2em;
}

a {
    text-decoration: none;
    color: var(--color-secundario);
    transition: color 0.3s;
}

/* ========================================================= */
/* BOTONES Y CTAs */
/* ========================================================= */

.btn-primario, .btn-secundario {
    display: inline-block;
    padding: 16px 40px; 
    border-radius: 6px; 
    font-weight: 600;
    text-align: center;
    transition: background-color 0.3s, transform 0.2s, box-shadow 0.3s;
    border: none;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-primario {
    background: var(--color-primario);
    color: var(--color-terciario); 
    margin-top: 25px;
    font-size: 1.2em;
    box-shadow: 0 4px 10px rgba(31, 69, 134, 0.4);
}

.btn-primario:hover {
    background: var(--color-secundario);
    color: var(--color-terciario);
    box-shadow: 0 6px 15px rgba(24, 113, 172, 0.6);
}

/* ========================================================= */
/* 1. NAVEGACIÓN (HEADER) */
/* ========================================================= */

.encabezado-principal {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 50px;
    background: var(--fondo-oscuro-base); 
    box-shadow: 0 2px 5px rgba(31, 69, 134, 0.2); 
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo-img {
    max-height: 45px; 
    width: auto;
    display: block;
}

.navegacion-principal {
    flex-grow: 1; 
    display: flex;
    justify-content: center; 
}

.navegacion-principal ul {
    list-style: none;
    display: flex;
    align-items: center; 
    gap: 0; 
}

.navegacion-principal ul li a {
    padding: 12px 18px; 
    display: block;
    color: var(--color-terciario); 
    font-weight: 500;
    white-space: nowrap; 
    transition: color 0.3s;
}

.navegacion-principal ul li a:hover, .navegacion-principal ul li a.active {
    color: var(--color-secundario);
    border-bottom: 3px solid var(--color-secundario); 
}

.nav-idiomas-item-movil {
    display: none; 
}

.menu-toggle {
    display: none; 
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 10px;
    z-index: 1001; 
}

.menu-toggle .bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    background-color: var(--color-secundario);
    transition: all 0.3s ease-in-out;
}

.selector-idioma-escritorio { display: flex; }
.selector-idioma-movil { display: none; }
.selector-idioma { display: flex; align-items: center; margin-left: 20px; z-index: 10; }
.lang-btn {
    background: transparent; color: var(--color-terciario); border: 1px solid var(--color-secundario); 
    padding: 8px 12px; font-size: 0.9em; font-weight: 600; cursor: pointer; 
    transition: background-color 0.3s, color 0.3s, border-color 0.3s; text-transform: uppercase; font-family: inherit; 
}
#btn-es, #btn-es-movil { border-radius: 4px 0 0 4px; border-right: none; }
#btn-en, #btn-en-movil { border-radius: 0 4px 4px 0; }
.lang-btn.active { background-color: var(--color-secundario); color: var(--fondo-oscuro-base); border-color: var(--color-secundario); cursor: default; }
.lang-btn:not(.active):hover { background-color: var(--color-primario); border-color: var(--color-primario); }


/* ========================================================= */
/* 6. PIE DE PÁGINA (FOOTER) */
/* ========================================================= */

footer {
    background: var(--fondo-oscuro-base); 
    color: var(--color-terciario);
    padding: 50px 0 20px;
}

footer .container {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 40px;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--color-primario); 
}

.pie-info h3 { color: var(--color-terciario); margin-bottom: 15px; font-size: 1.6em; }
.pie-enlaces h4 { color: var(--color-secundario); margin-bottom: 10px; }
.pie-enlaces a { color: var(--color-terciario); display: block; padding: 5px 0; }
.pie-enlaces a:hover { color: var(--color-secundario); }
.pie-social h4 { color: var(--color-secundario); margin-bottom: 10px; }
.pie-social a { color: var(--color-terciario); font-size: 2em; margin-right: 20px; }
.pie-social a:hover { color: var(--color-secundario); }
.copyright { text-align: center; margin-top: 30px; font-size: 0.9em; color: var(--color-terciario); }

/* ========================================================= */
/* RESPONSIVE (Móviles) */
/* ========================================================= */

@media (max-width: 900px) {
    .encabezado-principal { padding: 15px 20px; }
    .logo-img { max-height: 35px; }
    .selector-idioma-escritorio { display: none !important; }
    .nav-idiomas-item-movil { 
        display: block; width: 100%; text-align: center; padding: 20px 0 30px; 
        border-bottom: 1px solid var(--fondo-oscuro-superficie); 
    }
    .selector-idioma-movil { display: flex; justify-content: center; width: 100%; margin: 0; padding: 0; }
    .menu-toggle { display: block; }
    .navegacion-principal { 
        flex-grow: 0; position: fixed; top: 65px; right: 0; left: auto; width: 100%; height: 100vh; 
        background: var(--fondo-oscuro-base); transform: translateX(100%); transition: transform 0.4s ease-in-out;
        z-index: 999; overflow-y: auto; 
    }
    .navegacion-principal.menu-activo { transform: translateX(0); }
    .navegacion-principal ul { flex-direction: column; padding: 20px 0; align-items: stretch; }
    .navegacion-principal ul li a { 
        padding: 18px 25px; text-align: center; border-bottom: 1px solid var(--fondo-oscuro-superficie); 
        font-size: 1.1em;
    }
    .navegacion-principal ul li a:hover, .navegacion-principal ul li a.active { 
        border-bottom: none; background-color: var(--fondo-oscuro-superficie);
    }
    .menu-toggle.menu-activo .bar:nth-child(2) { opacity: 0; }
    .menu-toggle.menu-activo .bar:nth-child(1) { transform: translateY(8px) rotate(45deg); }
    .menu-toggle.menu-activo .bar:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }
    
    footer .container {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
}


/* ========================================================= */
/* ESTILOS ESPECÍFICOS: SECCIÓN COTIZACIÓN */
/* ========================================================= */

.seccion-cotizar {
    padding: 80px 0;
    background: none; 
    min-height: 80vh;
}

.titulo-cotizar {
    margin-bottom: 40px;
}

.contenedor-formulario {
    background: var(--fondo-oscuro-superficie);
    padding: 50px;
    border-radius: 12px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.5);
    border: 1px solid var(--color-primario);
    max-width: 900px;
    margin: 0 auto;
}

.formulario-cotizar {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.grupo-campo {
    border: 2px solid var(--color-secundario);
    border-radius: 8px;
    padding: 20px;
}

.grupo-campo legend {
    font-size: 1.6em;
    color: var(--color-blanco);
    font-weight: 700;
    padding: 0 10px;
}

.grilla-campos {
    display: grid;
    gap: 20px;
}

.grilla-campos.col-2 {
    grid-template-columns: 1fr 1fr;
}

.input-grupo {
    display: flex;
    flex-direction: column;
}

.input-grupo label {
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--color-blanco);
    font-size: 1em;
}

.formulario-cotizar input,
.formulario-cotizar select,
.formulario-cotizar textarea {
    padding: 12px;
    border: 1px solid var(--color-primario);
    border-radius: 4px;
    /* Fondo de casilla oscuro y sólido */
    background: var(--fondo-oscuro-superficie); 
    /* Texto blanco para que resalte */
    color: var(--color-blanco); 
    font-size: 1em;
    transition: border-color 0.3s;
    width: 100%;
}

.formulario-cotizar select {
    appearance: none; 
    padding-right: 30px; 
}

.formulario-cotizar textarea {
    resize: vertical;
}

.formulario-cotizar input:focus,
.formulario-cotizar select:focus,
.formulario-cotizar textarea:focus {
    border-color: var(--color-secundario);
    outline: none;
}

.hint {
    color: var(--color-secundario);
    font-size: 0.9em;
    margin-top: 5px;
    display: block;
}

.required-note {
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    margin-top: 20px;
    font-size: 0.9em;
}

.btn-primario.large-btn {
    padding: 20px 40px;
    font-size: 1.4em;
    margin-top: 40px;
}

@media (max-width: 768px) {
    .contenedor-formulario {
        padding: 20px;
    }
    .grilla-campos.col-2 {
        grid-template-columns: 1fr;
    }
    .grupo-campo legend {
        font-size: 1.4em;
    }
    .seccion-cotizar {
        padding: 40px 0;
    }
}