/* ==========================================================================
   PROYECTO: Valle Del Sur
   HOJA DE ESTILOS INSTITUCIONAL (CSS3 PURO)
   Paleta:
   - Verde oscuro institucional: #045c29 (RGB 4, 92, 41)
   - Verde secundario:          #1a8043 (RGB 26, 128, 67)
   - Blanco:                    #ffffff
   ========================================================================== */

/* --- Variables y configuración global --- */
:root {
    --color-primario: #045c29;
    --color-secundario: #1a8043;
    --color-blanco: #ffffff;
    --color-fondo-suave: #f4f8f5;
    --color-texto-oscuro: #1c2b21;
    --color-borde: rgba(4, 92, 41, 0.15);
    
    /* Variaciones translúcidas */
    --overlay-verde: rgba(4, 92, 41, 0.82);
    --sombra-suave: 0 4px 14px rgba(4, 92, 41, 0.10);
    --sombra-hover: 0 8px 24px rgba(4, 92, 41, 0.20);

    /* Tipografía y medidas */
    --fuente-principal: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --transicion-estandar: all 0.3s ease;
    --radio-borde: 8px;
    --ancho-maximo: 1140px;
}

/* --- Reset institucional --- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--fuente-principal);
    background-color: var(--color-blanco);
    color: var(--color-texto-oscuro);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1 0 auto;
}

/* --- Contenedor reutilizable --- */
.contenedor {
    width: 100%;
    max-width: var(--ancho-maximo);
    margin: 0 auto;
    padding: 0 20px;
}

/* ==========================================================================
   1. ENCABEZADO INSTITUCIONAL
   ========================================================================== */
.encabezado-institucional {
    background-color: var(--color-blanco);
    border-bottom: 2px solid var(--color-primario);
    box-shadow: 0 2px 10px rgba(4, 92, 41, 0.08);
    position: relative;
    z-index: 100;
}

.contenedor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 14px;
    padding-bottom: 14px;
    gap: 20px;
}

/* Logotipo / Nombre */
.logo-institucional {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--color-primario);
    transition: var(--transicion-estandar);
}

.logo-institucional:hover {
    color: var(--color-secundario);
}

.logo-icono {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    background-color: var(--color-primario);
    color: var(--color-blanco);
    border-radius: var(--radio-borde);
    padding: 7px;
    transition: var(--transicion-estandar);
}

.logo-icono svg {
    width: 100%;
    height: 100%;
}

.logo-institucional:hover .logo-icono {
    background-color: var(--color-secundario);
    transform: scale(1.05);
}

.logo-texto {
    font-size: 1.45rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

/* Navegación y Enlaces del Encabezado */
.nav-encabezado {
    display: flex;
    align-items: center;
    gap: 24px;
}

/* Lista de redes sociales */
.redes-sociales {
    display: flex;
    align-items: center;
    gap: 10px;
    list-style: none;
}

.icono-red {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    color: var(--color-primario);
    background-color: rgba(4, 92, 41, 0.08);
    text-decoration: none;
    transition: var(--transicion-estandar);
}

.icono-red svg {
    width: 18px;
    height: 18px;
}

.icono-red:hover,
.icono-red:focus-visible {
    background-color: var(--color-primario);
    color: var(--color-blanco);
    transform: translateY(-2px);
    outline: 2px solid var(--color-secundario);
    outline-offset: 2px;
}

/* Botón institucional PUCE */
.enlace-puces {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    padding: 6px 14px;
    background-color: var(--color-primario);
    color: var(--color-blanco);
    border-radius: var(--radio-borde);
    font-size: 0.88rem;
    font-weight: 600;
    transition: var(--transicion-estandar);
    border: 1px solid var(--color-primario);
}

.puce-etiqueta {
    background-color: var(--color-blanco);
    color: var(--color-primario);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.5px;
}

.icono-externo {
    font-size: 0.95rem;
    line-height: 1;
}

.enlace-puces:hover,
.enlace-puces:focus-visible {
    background-color: var(--color-secundario);
    border-color: var(--color-secundario);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(4, 92, 41, 0.25);
    outline: 2px solid var(--color-secundario);
    outline-offset: 2px;
}

/* ==========================================================================
   2. SECCIÓN PRINCIPAL O PORTADA (HERO)
   ========================================================================== */
.portada {
    position: relative;
    background-color: var(--color-primario);
    background-image: url('../imagenes/fondo.png');
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    color: var(--color-blanco);
    min-height: 480px;
    display: flex;
    align-items: center;
    padding: 50px 0;
}

/* Superposición verde institucional */
.portada-superposicion {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        rgba(4, 92, 41, 0.90) 0%,
        rgba(26, 128, 67, 0.82) 100%
    );
    z-index: 1;
}

.contenedor-portada {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 380px;
}

/* Botón Banca Móvil (Superior Derecho) */
.portada-banca-movil {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 40px;
}

.btn-banca-movil {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    background-color: var(--color-blanco);
    color: var(--color-primario);
    text-decoration: none;
    font-weight: 700;
    font-size: 0.95rem;
    padding: 11px 22px;
    border-radius: var(--radio-borde);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
    border: 2px solid var(--color-blanco);
    transition: var(--transicion-estandar);
}

.icono-banca {
    display: inline-flex;
    align-items: center;
}

.icono-banca svg {
    width: 20px;
    height: 20px;
}

.btn-banca-movil:hover,
.btn-banca-movil:focus-visible {
    background-color: var(--color-secundario);
    color: var(--color-blanco);
    border-color: var(--color-blanco);
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
    outline: none;
}

/* Textos principales */
.portada-textos {
    max-width: 800px;
    margin-top: auto;
    margin-bottom: auto;
}

.portada-titulo {
    font-size: clamp(2.3rem, 5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 16px;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
    letter-spacing: -0.5px;
}

.portada-subtitulo {
    font-size: clamp(1.1rem, 2.4vw, 1.35rem);
    font-weight: 300;
    line-height: 1.5;
    opacity: 0.95;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

/* ==========================================================================
   3. SECCIÓN DE INFORMACIÓN Y ESTILOS DE SECCIÓN
   ========================================================================== */
.seccion {
    padding: 65px 0;
}

.encabezado-seccion {
    text-align: center;
    margin-bottom: 36px;
}

.titulo-seccion {
    font-size: clamp(1.8rem, 3.5vw, 2.3rem);
    color: var(--color-primario);
    font-weight: 700;
    letter-spacing: -0.3px;
    margin-bottom: 12px;
}

/* Barra decorativa verde */
.divisor-verde {
    width: 70px;
    height: 4px;
    background: linear-gradient(to right, var(--color-primario), var(--color-secundario));
    margin: 0 auto;
    border-radius: 2px;
}

/* Sección Información */
.seccion-informacion {
    background-color: var(--color-blanco);
}

.contenido-informacion {
    max-width: 860px;
    margin: 0 auto;
    background-color: var(--color-fondo-suave);
    border-left: 5px solid var(--color-primario);
    padding: 30px 36px;
    border-radius: 0 var(--radio-borde) var(--radio-borde) 0;
    box-shadow: var(--sombra-suave);
}

.parrafo-descriptivo {
    font-size: 1.12rem;
    line-height: 1.85;
    color: #27382d;
    text-align: justify;
}

/* ==========================================================================
   4. GALERÍA DE IMÁGENES
   ========================================================================== */
.seccion-galeria {
    background-color: var(--color-fondo-suave);
    border-top: 1px solid var(--color-borde);
    border-bottom: 1px solid var(--color-borde);
}

.cuadricula-galeria {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.tarjeta-galeria {
    background-color: var(--color-blanco);
    border-radius: var(--radio-borde);
    overflow: hidden;
    box-shadow: var(--sombra-suave);
    transition: var(--transicion-estandar);
    border: 1px solid var(--color-borde);
}

.tarjeta-galeria:hover {
    transform: translateY(-5px);
    box-shadow: var(--sombra-hover);
    border-color: var(--color-secundario);
}

/* Contenedor de la imagen con respaldo estético (placeholder) */
.contenedor-imagen {
    position: relative;
    width: 100%;
    aspect-ratio: 4 / 3;
    overflow: hidden;
    background-color: #dcece1;
    /* Fondo decorativo con icono mientras no exista la imagen física */
    background-image: radial-gradient(var(--color-secundario) 1px, transparent 1px);
    background-size: 14px 14px;
}

.contenedor-imagen img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.4s ease;
}

.tarjeta-galeria:hover .contenedor-imagen img {
    transform: scale(1.05);
}

/* ==========================================================================
   5. PIE DE PÁGINA (FOOTER)
   ========================================================================== */
.pie-pagina {
    background-color: var(--color-primario);
    color: var(--color-blanco);
    padding: 45px 0 30px 0;
    margin-top: auto;
    border-top: 4px solid var(--color-secundario);
}

.contenedor-footer {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 20px;
}

.footer-titulo {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 6px;
    letter-spacing: -0.3px;
}

.footer-descripcion {
    font-size: 0.95rem;
    opacity: 0.9;
}

.footer-institucional {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 0.95rem;
}

.footer-link-puce {
    color: var(--color-blanco);
    text-decoration: underline;
    text-underline-offset: 3px;
    font-weight: 600;
    transition: var(--transicion-estandar);
}

.footer-link-puce:hover,
.footer-link-puce:focus-visible {
    color: #bbf7d0;
    text-decoration: none;
}

.footer-creditos {
    margin-top: 10px;
    padding-top: 18px;
    border-top: 1px solid rgba(255, 255, 255, 0.18);
    width: 100%;
    font-size: 0.88rem;
    opacity: 0.85;
}

/* ==========================================================================
   6. RESPONSIVE DESIGN (MEDIA QUERIES)
   ========================================================================== */

/* Tablets y pantallas medianas (<= 992px) */
@media (max-width: 992px) {
    .cuadricula-galeria {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .portada {
        min-height: 420px;
    }

    .contenido-informacion {
        padding: 24px 28px;
    }
}

/* Teléfonos y pantallas pequeñas (<= 768px) */
@media (max-width: 768px) {
    .contenedor-header {
        flex-direction: column;
        align-items: center;
        gap: 16px;
        text-align: center;
    }

    .nav-encabezado {
        flex-direction: column;
        gap: 14px;
        width: 100%;
    }

    .redes-sociales {
        justify-content: center;
    }

    .enlace-puces {
        width: auto;
        justify-content: center;
    }

    .portada {
        min-height: 380px;
        padding: 35px 0;
    }

    .contenedor-portada {
        min-height: 320px;
    }

    .portada-banca-movil {
        justify-content: center;
        margin-bottom: 25px;
    }

    .portada-textos {
        text-align: center;
    }

    .seccion {
        padding: 50px 0;
    }

    .parrafo-descriptivo {
        font-size: 1.02rem;
        text-align: left;
    }
}

/* Teléfonos móviles estrechos (<= 520px) */
@media (max-width: 520px) {
    .cuadricula-galeria {
        grid-template-columns: 1fr;
        gap: 18px;
    }

    .logo-texto {
        font-size: 1.25rem;
    }

    .btn-banca-movil {
        width: 100%;
        justify-content: center;
    }

    .contenido-informacion {
        padding: 20px 18px;
        border-left-width: 4px;
    }

    .footer-institucional {
        flex-direction: column;
        gap: 4px;
    }
}