/* Estilos Generales - Colores basados en el logo (Rojo, Azul, Verde, Negro) */
:root {
    --primary-color: #B22222; /* Rojo industrial */
    --secondary-color: #000080; /* Azul oscuro */
    --accent-color: #228B22; /* Verde */
    --dark-bg: #1a1a1a;
    --light-bg: #f4f4f4;
    --text-color: #333;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    color: var(--text-color);
}

/* Skip link for accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-color);
    color: white;
    padding: 8px;
    text-decoration: none;
    border-radius: 4px;
    z-index: 10000;
    transition: top 0.3s;
}

.skip-link:focus {
    top: 6px;
}

/* Section intro styling */
.section-intro {
    text-align: center;
    margin-bottom: 40px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* Navegación */
header {
    background: #fff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 20px;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-img {
    height: 50px;
    width: auto;
    object-fit: contain;
    transition: transform 0.3s ease;
}

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

.logo-text {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--secondary-color);
}

.nav-links {
    display: flex;
    gap: 20px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    padding: 8px 12px;
    border-radius: 4px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-links a:hover,
.nav-links a:focus {
    color: var(--primary-color);
    background-color: rgba(178, 34, 34, 0.1);
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Menú móvil - Hamburguesa */
.menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 4px;
    background: none;
    border: none;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

.menu-toggle:hover,
.menu-toggle:focus {
    background-color: rgba(178, 34, 34, 0.1);
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    margin: 3px 0;
    transition: 0.3s;
    border-radius: 2px;
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
}

/* Navegación con teclado */
.keyboard-navigation *:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Animaciones para scroll */
.animate-in {
    animation: fadeInUp 0.6s ease forwards;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.service-card,
.mvv-card,
.equipment-list li {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.service-card.animate-in,
.mvv-card.animate-in,
.equipment-list li.animate-in {
    opacity: 1;
    transform: translateY(0);
}

/* Hero Section */
.hero {
    background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('https://source.unsplash.com/1600x900/?oil,refinery,engineering'); /* Imagen de stock sugerida */
    background-size: cover;
    background-position: center;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: white;
    padding: 0 20px;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    max-width: 800px;
    margin-bottom: 2rem;
}

.btn {
    background: var(--primary-color);
    color: white;
    padding: 10px 30px;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    transition: background 0.3s;
}

.btn:hover {
    background: darkred;
}

/* Secciones Generales */
.section {
    padding: 80px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
    color: var(--secondary-color);
    text-transform: uppercase;
}

/* Misión, Visión, Valores */
.mvv-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.mvv-card {
    background: var(--light-bg);
    padding: 30px;
    border-left: 5px solid var(--accent-color);
    border-radius: 5px;
}

/* Servicios */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.service-card {
    background: #fff;
    border: 1px solid #ddd;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    transition: transform 0.3s;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.service-icon {
    font-size: 2rem;
    color: var(--secondary-color);
    margin-bottom: 15px;
}

/* Equipos */
.equipment-list {
    list-style: none;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.equipment-list li {
    background: var(--light-bg);
    padding: 15px;
    border-radius: 5px;
    text-align: center;
}

/* Contacto */
.contact-section {
    background: var(--dark-bg);
    color: white;
}

.contact-section .section-title {
    color: white;
}

.contact-info {
    text-align: center;
    font-size: 1.1rem;
}

footer {
    background: black;
    color: #888;
    text-align: center;
    padding: 20px;
    margin-top: 0;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 { 
        font-size: 2rem; 
        margin-bottom: 1rem;
    }
    
    .hero p {
        font-size: 1rem;
        margin-bottom: 1.5rem;
    }
    
    .section {
        padding: 60px 15px;
    }
    
    .section-title {
        font-size: 1.8rem;
        margin-bottom: 30px;
    }
    
    /* Logo responsive */
    .logo-img {
        height: 40px;
    }
    
    .logo-text {
        font-size: 1.2rem;
    }
    
    /* Menú móvil */
    .menu-toggle {
        display: flex;
    }
    
    .nav-links {
        display: none;
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        gap: 10px;
        z-index: 999;
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-links a {
        padding: 12px 16px;
        border-radius: 6px;
        text-align: center;
        font-size: 1.1rem;
    }
    
    /* Prevenir scroll cuando menú está abierto */
    body.menu-open {
        overflow: hidden;
    }
    
    /* Grid adjustments */
    .mvv-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .equipment-list {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .mvv-card,
    .service-card {
        padding: 20px;
    }
    
    .btn {
        padding: 12px 24px;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .logo-img {
        height: 35px;
    }
    
    .logo-text {
        font-size: 1rem;
    }
    
    .hero h1 {
        font-size: 1.8rem;
    }
    
    .hero p {
        font-size: 0.9rem;
    }
    
    .section {
        padding: 40px 10px;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
}