/* ===== CSS VARIABLES - TEMA CLARO/OSCURO ===== */
:root {
    /* Tema Claro (Default) */
    --color-bg-primary: #FFFFFF;
    --color-bg-secondary: #F4F4F4;
    --color-bg-tertiary: #FFFFFF;
    --color-text-primary: #333333;
    --color-text-secondary: #666666;
    --color-text-inverse: #FFFFFF;
    --color-brand-primary: #0D2C52;
    --color-brand-accent: #1A478B;
    --color-warm: #e9c46a;
    --color-border: #cccccc;
    --color-shadow: rgba(0, 0, 0, 0.1);
    --color-input-bg: #FFFFFF;
    --color-input-border: #cccccc;
}

/* Tema Oscuro (Respeta preferencia del sistema) */
@media (prefers-color-scheme: dark) {
    :root {
        --color-bg-primary: #1a1a1a;
        --color-bg-secondary: #2d2d2d;
        --color-bg-tertiary: #252525;
        --color-text-primary: #e0e0e0;
        --color-text-secondary: #b0b0b0;
        --color-text-inverse: #FFFFFF;
        --color-brand-primary: #1A478B;
        --color-brand-accent: #4a7ac9;
        --color-warm: #f4d89f;
        --color-border: #555555;
        --color-shadow: rgba(0, 0, 0, 0.3);
        --color-input-bg: #333333;
        --color-input-border: #555555;
    }
}

body {
    margin: 0;
    font-family: 'Roboto', sans-serif;
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* ===== CLASES DE UTILIDAD ===== */
.oculto {
    display: none;
}
.oculto-contenido {
    opacity: 0;
    transition: opacity 0.5s ease-in;
}

/* ===== SPLASH SCREEN ===== */
#splash-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-brand-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    transition: opacity 0.5s ease-out;
}

.logo-animado {
    max-width: 400px; 
    width: 80%;
    height: auto;
    opacity: 0; 
    animation: fadein 1s ease-in 0.5s forwards; 
}

@keyframes fadein {
    to {
        opacity: 1;
    }
}


/* ===== CONTENIDO PRINCIPAL (SELECTOR DE IDIOMA) ===== */
#main-content {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start; 
    padding-top: 35vh;
    background-color: var(--color-bg-primary);
}

#selector-idioma {
    text-align: center;
    padding: 30px;
    background: var(--color-bg-tertiary);
    border-radius: 8px;
    box-shadow: 0 4px 15px var(--color-shadow);
}

#selector-idioma p {
    color: var(--color-brand-primary);
    font-weight: 700;
}

.opciones-idioma button {
    padding: 12px 25px;
    margin: 10px;
    border: 2px solid var(--color-warm); 
    background-color: var(--color-warm); 
    color: var(--color-brand-primary); 
    cursor: pointer;
    font-weight: 700;
    font-size: 1em;
    transition: background-color 0.3s, color 0.3s, border-color 0.3s;
    border-radius: 4px;
}

.opciones-idioma button:hover {
    background-color: var(--color-brand-primary); 
    color: var(--color-text-inverse);
    border-color: var(--color-brand-primary);
}


/* ===== NAVBAR Y NAVEGACIÓN ===== */
#navbar-principal {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 5%;
    background-color: var(--color-brand-primary);
    color: var(--color-text-inverse);
    width: 90%;
    box-shadow: 0 2px 5px var(--color-shadow);
    flex-wrap: wrap;
}

#navbar-principal img {
    height: 120px;
    width: auto;
}

.links-nav {
    display: flex;
    gap: 20px;
    list-style: none;
}

.links-nav a {
    color: var(--color-text-inverse);
    text-decoration: none;
    font-weight: 400;
    transition: color 0.3s;
}

.links-nav a:hover {
    color: var(--color-warm);
}

/* ===== MENÚ HAMBURGUESA (MÓVIL) ===== */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--color-text-inverse);
    font-size: 1.5em;
    cursor: pointer;
    padding: 10px;
    transition: transform 0.2s;
}

.menu-toggle:hover {
    transform: scale(1.1);
}

@media (max-width: 768px) {
    #navbar-principal {
        flex-direction: column;
        align-items: flex-start;
        padding: 10px 5%;
        width: calc(90% - 10px);
    }

    #navbar-principal img {
        height: 60px;
        margin-bottom: 10px;
    }

    .menu-toggle {
        display: block;
        position: absolute;
        right: 15px;
        top: 15px;
    }

    .links-nav {
        display: none;
        flex-direction: column;
        width: 100%;
        background: var(--color-brand-accent);
        padding: 15px 0;
        margin-top: 10px;
        gap: 0;
    }

    .links-nav.active {
        display: flex;
    }

    .links-nav a {
        padding: 12px 15px;
        display: block;
    }
}

/* ===== SECCIONES - RESPONSIVE ===== */
section {
    padding: 40px 5%;
    width: 90%;
    background-color: var(--color-bg-secondary);
}

@media (min-width: 768px) {
    section {
        padding: 60px 5%;
    }
}

@media (min-width: 1024px) {
    section {
        padding: 80px 5%;
    }
}

/* ===== HERO SECTION ===== */
#hero-section {
    background-color: var(--color-warm); 
    min-height: 300px;
    color: var(--color-text-inverse); 
    text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.5); 
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    padding: 40px 5%;
}

#hero-section h1 {
    font-size: 1.5em;
    margin-bottom: 10px;
    font-weight: 700;
}

@media (min-width: 768px) {
    #hero-section {
        min-height: 350px;
        padding: 60px 5%;
    }
    
    #hero-section h1 {
        font-size: 2em;
    }
}

@media (min-width: 1024px) {
    #hero-section {
        min-height: 400px;
        padding: 80px 5%;
    }
    
    #hero-section h1 {
        font-size: 2.5em;
    }
}

/* ===== BOTONES CTA ===== */
.cta-principal {
    background-color: var(--color-brand-accent);
    color: var(--color-text-inverse);
    border: none;
    padding: 12px 25px;
    font-size: 1em;
    cursor: pointer;
    border-radius: 4px;
    margin-top: 20px;
    transition: background-color 0.3s, transform 0.2s;
}

.cta-principal:hover {
    background-color: var(--color-brand-primary);
    transform: translateY(-2px);
}

/* ===== SERVICIOS ===== */
#servicios-section {
    background-color: var(--color-bg-secondary);
    text-align: center;
}

.servicio-card {
    width: 100%;
    margin: 15px 0;
    padding: 20px;
    background: var(--color-bg-tertiary);
    border-radius: 8px;
    box-shadow: 0 2px 5px var(--color-shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

.servicio-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px var(--color-shadow);
}

@media (min-width: 768px) {
    .servicio-card {
        display: inline-block;
        width: 48%;
        margin: 1%;
    }
}

@media (min-width: 1024px) {
    .servicio-card {
        width: 30%;
        margin: 1.5%;
    }
}

/* ===== CONTACTO Y FORMULARIO ===== */
#contacto-section {
    background-color: var(--color-bg-primary);
    padding: 40px 5%;
    text-align: center;
}

@media (min-width: 768px) {
    #contacto-section {
        padding: 60px 5%;
    }
}

@media (min-width: 1024px) {
    #contacto-section {
        padding: 80px 5%;
    }
}

#contact_form {
    max-width: 600px;
    margin: 30px auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

#contact_form input,
#contact_form textarea {
    padding: 12px;
    border: 1px solid var(--color-input-border);
    border-radius: 4px;
    font-size: 1em;
    background-color: var(--color-input-bg);
    color: var(--color-text-primary);
    transition: border-color 0.3s, box-shadow 0.3s;
}

#contact_form input:focus,
#contact_form textarea:focus {
    outline: none;
    border-color: var(--color-brand-accent);
    box-shadow: 0 0 5px var(--color-brand-accent);
}

.contact-info {
    margin-top: 40px;
    line-height: 1.6;
}

/* ===== FOOTER ===== */
#footer-principal {
    background-color: #333;
    color: #999;
    text-align: center;
    padding: 20px 0;
    font-size: 0.8em;
}

#footer-principal a {
    color: var(--color-warm);
    text-decoration: none;
    transition: color 0.3s;
}

#footer-principal a:hover {
    color: var(--color-text-inverse);
}

/* ===== BOTÓN DESCARGA DE DOCUMENTOS ===== */
.cta-document {
    background-color: var(--color-brand-primary);
    color: var(--color-text-inverse);
    border: none;
    padding: 12px 25px;
    font-size: 1em;
    cursor: pointer;
    border-radius: 4px;
    margin-top: 20px;
    display: inline-flex;
    align-items: center;
    text-decoration: none;
    transition: background-color 0.3s, transform 0.2s;
}

.cta-document:hover {
    background-color: var(--color-brand-accent);
    transform: translateY(-2px);
}

.cta-document span {
    font-size: 1.2em; 
    margin-right: 10px;
}