/* ------------------------- */
/* 0. VARIABLES Y RESET BÁSICO */
/* ------------------------- */
:root {
    --color-primary: #0077B6;      /* Azul técnico */
    --color-secondary: #00B4D8;    /* Azul claro de acento */
    --color-dark: #202020;         /* Negro o gris oscuro */
    --color-light: #F4F4F9;        /* Gris muy claro / fondo */
    --color-text: #444444;         /* Texto principal */
    
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Montserrat', sans-serif;
    --font-mono: 'Roboto Mono', monospace; /* Para datos técnicos */
    
    --padding-section: 6rem 0;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-body);
    line-height: 1.6;
    color: var(--color-text);
    background-color: #ffffff;
}

/* Contenedor central */
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

/* ------------------------- */
/* 1. TIPOGRAFÍA */
/* ------------------------- */
h1, h2, h3 {
    font-family: var(--font-heading);
    color: var(--color-dark);
    margin-bottom: 1rem;
    font-weight: 700;
}

h2 {
    font-size: 2.5rem;
    line-height: 1.1;
}

h3 {
    font-size: 1.8rem;
    color: var(--color-primary); /* Destacar títulos de sección */
    margin-bottom: 2rem;
}

/* ------------------------- */
/* 2. BOTONES Y UTILIDADES */
/* ------------------------- */
.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    text-decoration: none;
    border-radius: 4px;
    font-weight: 600;
    transition: background-color 0.3s ease;
    text-transform: uppercase;
    font-size: 0.9rem;
}

.btn-primary {
    background-color: var(--color-primary);
    color: white;
}

.btn-primary:hover {
    background-color: #005A8D;
}

.btn-secondary {
    background-color: var(--color-secondary);
    color: var(--color-dark);
}

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: white;
}

.bg-dark {
    background-color: var(--color-dark);
    color: white;
}

.bg-light {
    background-color: var(--color-light);
}

/* ------------------------- */
/* 3. CABECERA (HEADER) */
/* ------------------------- */
.header {
    background-color: white;
    box-shadow: 0 1px 5px rgba(0, 0, 0, 0.08);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-primary);
}

.nav a {
    color: var(--color-dark);
    text-decoration: none;
    margin-left: 20px;
    font-weight: 600;
}

/* ------------------------- */
/* 4. HERO SECTION */
/* ------------------------- */
.hero {
    background-image: linear-gradient(rgba(255, 255, 255, 0.8), rgba(255, 255, 255, 0.8)), url('ruta/a/imagen-fondo.jpg'); /* Idealmente una imagen de detalle técnico */
    background-size: cover;
    background-position: center;
    padding: 8rem 0;
    text-align: center;
}

.hero h2 {
    color: var(--color-dark);
    font-size: 3.5rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero p {
    font-size: 1.3rem;
    margin: 1.5rem auto 2.5rem;
    max-width: 600px;
}

/* ------------------------- */
/* 5. SECCIONES GENERALES */
/* ------------------------- */
.section {
    padding: var(--padding-section);
}

.section h3 {
    text-align: center;
}

/* ------------------------- */
/* 6. FOOTER */
/* ------------------------- */
.footer {
    padding: 3rem 0;
    text-align: center;
    font-size: 0.9rem;
}

.footer p {
    margin-top: 1rem;
}