:root {
    --color-1: #2c3e50;    /* Azul oscuro */
    --color-2: #3498db;    /* Azul cielo */
    --color-3: #ecf0f1;    /* Gris claro */
    --color-4: #95a5a6;    /* Gris medio */
    --color-5: #1a5276;    /* Azul profundo */
}

/* Estilos generales */
body {
    font-family: 'Arial', sans-serif;
    padding-top: 56px;
    color: var(--color-1);
    background-image: url('background.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(rgba(26, 82, 118, 0.8), rgba(44, 62, 80, 0.8)), url('hero-bg.jpg');
    background-size: cover;
    background-position: center;
    color: white;
    padding: 150px 0;
    margin-bottom: 50px;
}

.hero-section h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
}

/* Navbar */
.navbar-dark {
    background-color: var(--color-1) !important;
}

.nav-link:hover {
    color: var(--color-2) !important;
}

/* Botones */
.btn-primary {
    background-color: var(--color-2);
    border-color: var(--color-2);
}

.btn-primary:hover {
    background-color: var(--color-5);
    border-color: var(--color-5);
}

/* Cards */
.card {
    transition: transform 0.3s;
    box-shadow: 0 4px 6px rgba(44, 62, 80, 0.1);
    border-color: var(--color-3);
    background-color: rgba(255, 255, 255, 0.95);
}

.card:hover {
    transform: translateY(-5px);
}

.card-img-top {
    height: 200px;
    object-fit: cover;
}

.card-title {
    color: var(--color-5);
}

/* Características */
.fas {
    color: var(--color-2);
}

/* Secciones */
.bg-light {
    background-color: var(--color-3) !important;
}

/* Formulario de contacto */
.form-control {
    margin-bottom: 15px;
    border-color: var(--color-4);
    background-color: rgba(255, 255, 255, 0.9);
}

.form-control:focus {
    border-color: var(--color-2);
    box-shadow: 0 0 0 0.25rem rgba(52, 152, 219, 0.25);
}

/* Footer */
.bg-dark {
    background-color: var(--color-1) !important;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-section {
        padding: 100px 0;
    }

    .hero-section h1 {
        font-size: 2.5rem;
    }
}

/* Botón Volver */
.btn-volver {
    position: fixed;
    bottom: 20px;
    left: 20px;
    z-index: 1000;
    padding: 10px 20px;
    border-radius: 30px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    background-color: var(--color-2);
    border-color: var(--color-2);
    transition: all 0.3s ease;
}

.btn-volver:hover {
    background-color: var(--color-5);
    border-color: var(--color-5);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.btn-volver i {
    margin-right: 5px;
}

/* Títulos de sección */
.text-center.mb-5 {
    position: relative;
    padding: 15px 30px;
    display: inline-block;
    background-color: rgba(44, 62, 80, 0.7);
    border-radius: 10px;
    color: white;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    margin: 0 auto 3rem !important;
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    width: auto;
    min-width: 300px;
}

.text-center.mb-5::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background-color: var(--color-2);
    border-radius: 2px;
}