/* ============================================
   DOBLE Z SOLAR - Hoja de Estilos Principal
   Versión: 2.0 | Abril 2026
   ============================================ */

/* --- Variables CSS --- */
:root {
    --verde-solar: #228B22;
    --amarillo-solar: #ecab0f;
    --verde-claro: #90ee90;
    --gris-suave: #f4f7f6;
    --whatsapp-color: #25d366;
    --azul-corporativo: #0a3d62;
    --texto-principal: #333333;
    --blanco: #ffffff;
    --sombra-suave: 0 5px 15px rgba(0, 0, 0, 0.1);
    --sombra-media: 0 10px 30px rgba(0, 0, 0, 0.15);
    --radio-btn: 50px;
    --radio-card: 15px;
    --transicion: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

/* --- Header / Navegación --- */
.site-header {
    background: var(--blanco);
    padding: 10px 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid var(--gris-suave);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: box-shadow 0.3s ease;
}

.site-header.scrolled {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
}

.logo-nav {
    height: 50px;
    width: auto;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 20px;
}

.site-nav a {
    font-weight: 600;
    transition: var(--transicion);
    color: var(--texto-principal);
}

.site-nav a:hover {
    color: var(--verde-solar);
}

.btn-whatsapp-nav {
    background-color: var(--whatsapp-color);
    color: var(--blanco) !important;
    padding: 10px 20px;
    border-radius: var(--radio-btn);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-whatsapp-nav:hover {
    background-color: #1ebe5b;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(37, 211, 102, 0.4);
}

/* --- Botón Flotante WhatsApp --- */
.whatsapp-float {
    position: fixed;
    width: 60px;
    height: 60px;
    bottom: 40px;
    right: 40px;
    background-color: var(--whatsapp-color);
    color: var(--blanco);
    border-radius: 50%;
    text-align: center;
    font-size: 30px;
    box-shadow: 2px 2px 10px rgba(0, 0, 0, 0.3);
    z-index: 1001;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transicion);
    aria-label: "Contactar por WhatsApp";
}

.whatsapp-float:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 25px rgba(37, 211, 102, 0.5);
}

/* Pulso animado */
.whatsapp-float::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: var(--whatsapp-color);
    animation: pulse 2s infinite;
    z-index: -1;
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 0.7; }
    70% { transform: scale(1.4); opacity: 0; }
    100% { transform: scale(1.4); opacity: 0; }
}

/* --- Hero Section --- */
.hero {
    background: linear-gradient(rgba(10, 61, 98, 0.87), rgba(10, 61, 98, 0.87)),
                url('../proyecto3.jpeg') center/cover no-repeat;
    color: var(--blanco);
    padding: 100px 5%;
    text-align: center;
}

.hero-logo {
    max-width: 220px;
    margin: 0 auto 20px;
    border-radius: var(--radio-card);
    background-color: white;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
}

.hero h1 {
    font-size: 2.8rem;
    margin-bottom: 15px;
    line-height: 1.2;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 35px;
    max-width: 800px;
    margin-inline: auto;
    opacity: 0.95;
}

.btn-hero {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--blanco);
    color: var(--azul-corporativo) !important;
    font-size: 1rem;
    font-weight: 700;
    padding: 12px 28px;
    border-radius: var(--radio-btn);
    transition: var(--transicion);
}

.btn-hero:hover {
    background: var(--amarillo-solar);
    color: #111 !important;
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(236, 171, 15, 0.4);
}

/* --- Sección Beneficios / Comparativa --- */
.section-beneficios {
    background: var(--gris-suave);
    padding: 70px 5%;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    color: var(--azul-corporativo);
    margin-bottom: 40px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--amarillo-solar);
    margin: 12px auto 0;
    border-radius: 2px;
}

.table-container {
    overflow-x: auto;
}

.tabla-comparativa {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    border-collapse: collapse;
    background: var(--blanco);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--sombra-suave);
}

.tabla-comparativa th,
.tabla-comparativa td {
    padding: 18px;
    border-bottom: 1px solid #ddd;
    text-align: center;
}

.tabla-comparativa thead th {
    background: var(--azul-corporativo);
    color: var(--blanco);
    font-size: 1rem;
}

.tabla-comparativa tbody tr:hover {
    background-color: #f0f8ff;
    transition: background 0.2s;
}

/* --- Tarjeta de Ahorro --- */
.ahorro-card {
    background: var(--blanco);
    border-left: 8px solid var(--verde-solar);
    padding: 30px;
    max-width: 650px;
    margin: 40px auto 0;
    box-shadow: var(--sombra-media);
    border-radius: 0 var(--radio-card) var(--radio-card) 0;
}

.ahorro-card h3 {
    font-size: 1.4rem;
    color: var(--azul-corporativo);
    margin-bottom: 10px;
}

.precio-ede {
    text-decoration: line-through;
    color: #e53935;
    font-weight: 500;
    margin-bottom: 5px;
}

.precio-solar {
    font-size: 1.6rem;
    color: var(--verde-solar);
    font-weight: 800;
    margin: 0;
}

.ahorro-anual {
    color: var(--verde-solar);
    font-weight: 700;
    font-size: 1.2rem;
    margin-top: 10px;
}

/* --- Beneficios Visuales (iconos) --- */
.beneficios-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 25px;
    max-width: 1000px;
    margin: 50px auto 0;
}

.beneficio-item {
    background: var(--blanco);
    border-radius: var(--radio-card);
    padding: 30px 20px;
    text-align: center;
    box-shadow: var(--sombra-suave);
    transition: var(--transicion);
}

.beneficio-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--sombra-media);
}

.beneficio-item .icono {
    font-size: 2.5rem;
    color: var(--verde-solar);
    margin-bottom: 12px;
}

.beneficio-item h3 {
    font-size: 1rem;
    color: var(--azul-corporativo);
    margin-bottom: 8px;
}

.beneficio-item p {
    font-size: 0.9rem;
    color: #666;
}

/* --- Sección Proyectos --- */
.section-proyectos {
    padding: 70px 5%;
}

.galeria {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

.galeria-item {
    overflow: hidden;
    border-radius: var(--radio-card);
    box-shadow: var(--sombra-suave);
    background: #eee;
    position: relative;
}

.galeria-item img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.galeria-item:hover img {
    transform: scale(1.05);
}

.galeria-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(10,61,98,0.8));
    color: var(--blanco);
    padding: 20px 15px 15px;
    font-size: 0.9rem;
    font-weight: 600;
    transform: translateY(100%);
    transition: transform 0.3s ease;
}

.galeria-item:hover .galeria-overlay {
    transform: translateY(0);
}

/* --- CTA Final --- */
.section-cta {
    text-align: center;
    padding: 60px 5%;
    background: linear-gradient(135deg, var(--azul-corporativo), #0d5a96);
    color: var(--blanco);
}

.section-cta h2 {
    color: var(--blanco);
    margin-bottom: 15px;
}

.section-cta p {
    margin-bottom: 30px;
    opacity: 0.9;
    font-size: 1.1rem;
}

.btn-cta {
    background: var(--amarillo-solar);
    color: #222;
    padding: 18px 40px;
    font-size: 1.2rem;
    font-weight: 800;
    border-radius: var(--radio-btn);
    display: inline-flex;
    align-items: center;
    gap: 12px;
    transition: var(--transicion);
}

.btn-cta:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 30px rgba(236, 171, 15, 0.5);
    background: #f5b800;
}

/* --- Footer --- */
.site-footer {
    background: #1a1a1a;
    color: var(--blanco);
    padding: 50px 5% 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

.footer-col h4 {
    color: var(--amarillo-solar);
    margin-bottom: 15px;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-col p,
.footer-col a {
    font-size: 0.9rem;
    opacity: 0.8;
    margin-bottom: 8px;
    display: block;
    transition: opacity 0.2s;
}

.footer-col a:hover {
    opacity: 1;
    color: var(--amarillo-solar);
}

.footer-bottom {
    border-top: 1px solid #333;
    padding-top: 20px;
    text-align: center;
    font-size: 0.85rem;
    opacity: 0.6;
}

/* --- Utilidades --- */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 1.9rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .site-nav a:not(.btn-whatsapp-nav) {
        display: none;
    }

    .section-title {
        font-size: 1.6rem;
    }

    .btn-cta {
        font-size: 1rem;
        padding: 15px 25px;
    }

    .whatsapp-float {
        width: 52px;
        height: 52px;
        font-size: 26px;
        bottom: 20px;
        right: 20px;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 70px 5%;
    }

    .ahorro-card {
        padding: 20px;
    }
}