/* === Variables CSS Alineadas con el Logo === */
:root {
    /* Colores principales del logo AR Suministros */
    --brand-primary-dark: #1A1A1A; /* Negro/Gris muy oscuro del logo (para texto principal, elementos base) */
    --brand-accent-red: #B52025;   /* Rojo oscuro del logo (para CTAs, iconos, highlights) */
    
    /* Colores secundarios y neutrales */
    --brand-secondary-red-lighter: #D32F2F; /* Un rojo un poco más claro para hovers o variaciones */
    --text-dark: #212529;      /* Casi negro para la mayoría del texto */
    --text-medium: #495057;    /* Gris medio para texto secundario */
    --text-light: #f8f9fa;     /* Para texto sobre fondos oscuros */
    --text-on-accent: #ffffff; /* Texto blanco sobre el rojo de acento */

    --bg-body: #ffffff;
    --bg-light-gray: #f8f9fa;  /* Gris muy claro para fondos de sección alternos */
    --bg-medium-gray: #e9ecef; /* Gris un poco más oscuro para elementos sutiles */
    --bg-footer: #1A1D24;    /* Un gris muy oscuro, casi negro, para el footer */

    --border-color: #dee2e6;     /* Borde gris claro estándar */
    --border-radius-soft: 6px;
    --border-radius-medium: 8px;

    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.04); /* Sombras más sutiles */
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.08);

    --font-primary: 'Open Sans', sans-serif;
    --header-height: 115px;
}

/* === Reseteo Básico y Estilos Globales === */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--header-height) + 20px);
}

body {
    font-family: var(--font-primary);
    line-height: 1.7;
    color: var(--text-dark);
    background-color: var(--bg-body);
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: auto;
    padding: 0 20px;
}

a {
    color: var(--brand-accent-red);
    text-decoration: none;
    transition: color 0.2s ease-in-out, opacity 0.2s ease-in-out;
}

a:hover, a:focus {
    color: var(--brand-secondary-red-lighter);
    text-decoration: none;
    outline: 2px solid var(--brand-accent-red);
    outline-offset: 2px;
}
a:focus:not(:focus-visible) {
    outline: none;
}

h1, h2, h3, h4, h5, h6 {
    margin-bottom: 1.25rem;
    color: var(--brand-primary-dark);
    font-weight: 700;
    line-height: 1.3;
}
h2 {
    font-size: 2.25rem;
    text-align: center;
    margin-bottom: 3rem;
}
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }


section {
    padding: 70px 0;
}
section:nth-of-type(even) {
    background-color: var(--bg-light-gray);
}


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

ul { list-style: none; }

.btn {
    padding: 12px 28px;
    margin: 5px;
    border-radius: var(--border-radius-soft);
    text-transform: uppercase;
    font-weight: 600;
    font-size: 0.95rem;
    display: inline-block;
    transition: background-color 0.2s ease-in-out, color 0.2s ease-in-out, transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
    border: 1px solid transparent;
    cursor: pointer;
    letter-spacing: 0.5px;
}
.btn:hover, .btn:focus {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-primary {
    background: var(--brand-accent-red);
    color: var(--text-on-accent);
    border-color: var(--brand-accent-red);
}
.btn-primary:hover, .btn-primary:focus {
    background: var(--brand-secondary-red-lighter);
    border-color: var(--brand-secondary-red-lighter);
    color: var(--text-on-accent);
    text-decoration: none;
}

.btn-secondary {
    background: var(--brand-primary-dark);
    color: var(--text-on-accent);
    border-color: var(--brand-primary-dark);
}
.btn-secondary:hover, .btn-secondary:focus {
    background: #333;
    border-color: #333;
    color: var(--text-on-accent);
    text-decoration: none;
}

/* === Barra Superior === */
.top-bar {
    background: var(--bg-medium-gray);
    padding: 10px 0;
    font-size: 0.875rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-medium);
}
.top-bar .container {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 25px;
}
.top-bar span i {
    margin-right: 8px;
    color: var(--brand-primary-dark);
}
.top-bar a {
    color: var(--text-medium);
}
.top-bar a:hover, .top-bar a:focus {
    color: var(--brand-accent-red);
}

/* === Cabecera Principal === */
.main-header {
    background: var(--bg-body);
    height: var(--header-height);
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}
.main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}
.logo img {
  height: 105px;
  width: auto;
}
.main-nav ul { display: flex; }
.main-nav ul li { margin-left: 30px; }
.main-nav ul li a {
    color: var(--text-dark);
    text-transform: uppercase;
    font-weight: 600;
    font-size: 0.9rem;
    padding: 10px 0;
    position: relative;
    letter-spacing: 0.5px;
}
.main-nav ul li a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--brand-accent-red);
    transition: width 0.3s ease;
}
.main-nav ul li a:hover::after,
.main-nav ul li a:focus::after,
.main-nav ul li a.active::after {
    width: 100%;
}
.main-nav ul li a:hover, .main-nav ul li a:focus {
    color: var(--brand-primary-dark);
    text-decoration: none;
}

/* === Sección Héroe === */
.hero {
  background-image: linear-gradient(rgba(0,0,0,0.3), rgba(0,0,0,0.3)), url('images/fabrica-noche.jpg');
  background-size: cover;
  background-position: center center;
  background-attachment: fixed;
  color: var(--text-light);
  padding: 100px 0;
  min-height: 75vh;
  display: flex;
  align-items: center;
  text-align: center;
  position: relative;
}
.hero-overlay {
    display: none;
}
.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin: 0 auto;
}
.hero h1 {
    font-size: 2.8rem;
    margin-bottom: 1.5rem;
    color: var(--text-light);
    font-weight: 700;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.5);
}
.hero p {
    font-size: 1.2rem;
    margin-bottom: 2.5rem;
    line-height: 1.8;
    opacity: 0.95;
}
.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}
.hero .btn { font-size: 1rem; padding: 14px 32px; }

/* === Sección Categorías === */
.categories-section {
    background: var(--bg-light-gray);
}
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}
.category-item {
    background: var(--bg-body);
    padding: 30px 25px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-medium);
    text-align: center;
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    box-shadow: var(--shadow-sm);
}
.category-item:hover, .category-item:focus-within {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.category-icon {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    margin: 0 auto 20px auto;
    overflow: hidden;
    border: 3px solid var(--brand-accent-red);
    box-shadow: var(--shadow-sm);
    background-color: #fff;
}
.category-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.category-item h3 {
    font-size: 1.25rem;
    margin-bottom: 10px;
    color: var(--brand-primary-dark);
}
.category-item p {
    font-size: 0.9rem;
    color: var(--text-medium);
}

/* === Sección Servicios Destacados === */
.featured-services-section {
    background: var(--bg-body);
}
.service-item {
    display: flex;
    gap: 40px;
    align-items: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
}
.service-image {
    flex: 1;
    min-width: 300px;
    max-width: 500px;
}
.service-image img {
    border-radius: var(--border-radius-medium);
    box-shadow: var(--shadow-md);
}
.service-description {
    flex: 1.5;
    min-width: 300px;
}
.service-description h3 {
     color: var(--brand-primary-dark);
     font-size: 1.65rem;
}
.service-description ul {
    list-style: none;
    padding-left: 0;
    margin-bottom: 25px;
}
.service-description ul li {
    margin-bottom: 12px;
    display: flex;
    align-items: flex-start;
    color: var(--text-medium);
    font-size: 0.95rem;
}
.service-description ul li i.fa-check-circle {
    color: var(--brand-accent-red);
    margin-right: 10px;
    font-size: 1.1rem;
    margin-top: 3px;
}

/* === Sección Por qué Elegirnos === */
.why-us-section {
      background: var(--bg-light-gray);
}
.reasons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 30px;
}
.reason-item {
    background: var(--bg-body);
    padding: 30px 25px;
    border-radius: var(--border-radius-medium);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.reason-item:hover, .reason-item:focus-within {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}
.reason-icon {
    color: var(--brand-accent-red);
    margin-bottom: 20px;
    font-size: 2.5em;
}
.reason-item h3 {
    font-size: 1.25rem;
    margin-bottom: 10px;
    color: var(--brand-primary-dark);
}
.reason-item p {
    font-size: 0.9rem;
    color: var(--text-medium);
}
/* === Sección Marcas (con scroll horizontal) === */
.brands-section {
    background-color: var(--bg-body);
    padding: 60px 0;
}
.brands-section h2 { 
    margin-bottom: 50px; 
}

/* Contenedor de logos para el carrusel */
.brands-logos {
    display: flex; /* Muestra los logos en una fila */
    overflow-x: auto; /* Habilita el scroll horizontal */
    -webkit-overflow-scrolling: touch; /* Mejora el desplazamiento en dispositivos iOS */
    white-space: nowrap; /* Evita que los logos se salten a la siguiente línea */
    padding-bottom: 20px; /* Espacio para el scrollbar */
    gap: 50px 40px; /* Espacio horizontal y vertical entre los logos */
    justify-content: flex-start; /* Alinea los logos al inicio */
    align-items: center;
}

/* Estilos para el scrollbar (opcional, mejora la visibilidad) */
.brands-logos::-webkit-scrollbar {
    height: 8px;
}
.brands-logos::-webkit-scrollbar-thumb {
    background: var(--brand-accent-red);
    border-radius: 10px;
}
.brands-logos::-webkit-scrollbar-track {
    background: var(--bg-medium-gray);
    border-radius: 10px;
}

/* Estilos de cada logo */
.brand-logo-item {
    flex-shrink: 0; /* IMPORANTE: Evita que los logos se encojan */
    display: inline-block;
    padding: 0 10px;
}
.brand-logo-item img {
    max-height: 75px;
    width: auto;
    max-width: 195px;
    filter: grayscale(0%); /* **AQUÍ SE MUESTRAN A COLOR POR DEFECTO** */
    opacity: 1;
    transition: filter 0.3s ease, opacity 0.3s ease, transform 0.2s ease;
    display: block;
}

/* Efecto al pasar el cursor (hover) */
.brands-logos img:hover, .brands-logos img:focus {
    filter: grayscale(0%) brightness(1);
    opacity: 1;
    transform: scale(1.05);
    outline: 2px solid var(--brand-accent-red);
    outline-offset: 2px;
}

}

/* === Sección Contacto === */
.contact-section {
      background: var(--bg-light-gray);
}
.contact-intro {
    text-align: center;
    font-size: 1.1rem;
    margin-bottom: 3rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    color: var(--text-medium);
}
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 40px;
    align-items: flex-start;
}
.contact-details {
    background-color: var(--bg-body);
    padding: 30px;
    border-radius: var(--border-radius-medium);
    box-shadow: var(--shadow-md);
}
.contact-details h3 {
    margin-bottom: 20px;
    font-size: 1.4rem;
    color: var(--brand-primary-dark);
}
.contact-details p {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    color: var(--text-medium);
    font-size: 0.95rem;
}
.contact-details i {
    color: var(--brand-accent-red);
    margin-right: 15px;
    width: 20px;
    text-align: center;
    font-size: 1.1em;
}
.contact-details a { color: var(--brand-primary-dark); }
.contact-details a:hover, .contact-details a:focus { color: var(--brand-accent-red); }

.contact-map iframe {
    border-radius: var(--border-radius-medium);
    box-shadow: var(--shadow-md);
    height: 100%;
    min-height: 350px;
}

/* === Pie de Página === */
.site-footer {
    background: var(--bg-footer);
    color: #a0aec0;
    padding: 60px 0 25px 0;
    margin-top: 50px;
    font-size: 0.9rem;
}
.site-footer a {
    color: #cbd5e0;
}
.site-footer a:hover, .site-footer a:focus {
    color: var(--brand-accent-red);
    text-decoration: none;
}
.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 35px;
    margin-bottom: 40px;
}
.footer-logo-img {
    max-height: 135px;
    width: auto;
    margin-bottom: 15px;
}
.footer-about p {
    margin-bottom: 15px;
    line-height: 1.6;
}
.footer-links-column h4, .footer-contact-info h4 {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 18px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.footer-links-column ul li {
    margin-bottom: 10px;
}
.footer-contact-info p {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
}
.footer-contact-info p i {
    margin-right: 10px;
    font-size: 1rem;
    width: 18px;
    text-align: center;
    color: var(--brand-accent-red);
}
.footer-bottom {
    text-align: center;
    padding-top: 25px;
    border-top: 1px solid #313a49;
    font-size: 0.85rem;
    color: #718096;
}
.footer-bottom p { margin-bottom: 0;}

/* === Navegación de Hamburguesa para Móviles === */

.mobile-nav-toggle {
    display: none; /* Oculto por defecto en desktop */
    border: 0;
    background: transparent;
    cursor: pointer;
    padding: 0.5rem;
    position: relative;
    z-index: 999;
}

.mobile-nav-toggle .icon-bar {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--brand-primary-dark);
    margin: 5px 0;
    transition: all 0.3s ease;
}

.mobile-nav-toggle[aria-expanded="true"] .icon-bar:nth-child(2) {
    opacity: 0;
}

.mobile-nav-toggle[aria-expanded="true"] .icon-bar:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-nav-toggle[aria-expanded="true"] .icon-bar:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}


/* === Media Queries para Responsividad === */
@media (max-width: 992px) {
    .main-header { padding-top: 10px; padding-bottom: 10px; }
    .logo img { height: 75px; }

    .main-header .container {
        display: grid;
        grid-template-columns: 1fr auto;
        align-items: center;
    }

    .main-nav {
        position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        background: var(--bg-body);
        width: 70%;
        max-width: 300px;
        padding-top: 100px;
        box-shadow: -5px 0 15px rgba(0,0,0,0.1);
        transform: translateX(100%);
        transition: transform 0.3s ease-in-out;
    }
    
    .main-nav[data-visible="true"] {
        transform: translateX(0%);
    }

    .main-nav ul {
        flex-direction: column;
        align-items: flex-start;
        padding: 20px;
    }

    .main-nav ul li {
        margin: 10px 0;
    }
    .main-nav ul li a {
        padding: 10px 0;
        font-size: 1.1rem;
        font-weight: 700;
        border-bottom: 1px solid var(--border-color);
        width: 100%;
        display: block;
    }
    .main-nav ul li a:hover::after, .main-nav ul li a:focus::after {
        width: 0;
    }
    
    .mobile-nav-toggle {
        display: block;
    }
    
    .contact-grid,
    .footer-content,
    .reasons-grid,
    .category-grid,
    .service-item {
        grid-template-columns: 1fr;
    }
    
    .contact-details,
    .contact-map iframe {
        min-height: 250px;
    }
    
    .footer-content { text-align: center; }
    .footer-contact-info p { justify-content: center; }
}

@media (max-width: 768px) {
    h2 { font-size: 2rem; margin-bottom: 2rem; }
    .hero h1 { font-size: 2.2rem; }
    .hero p { font-size: 1rem; }
    .hero-buttons { flex-direction: column; gap: 10px; }
    .service-item { flex-direction: column; }
    .service-image img { margin-bottom: 20px; }
}

@media (max-width: 480px) {
    .top-bar .container { gap: 10px; }
    .top-bar span { font-size: 0.8rem; }
    .logo img { height: 60px; }
    .hero h1 { font-size: 1.8rem; }
    .hero p { font-size: 0.95rem; }
    .brands-logos { gap: 20px; }
    .brand-logo-item img { max-height: 40px; }
}