/* === VARIABLES === */
:root {
    --primary-blue: #1A54A6;
    --light-blue: #3E84F5;
    --text-dark: #333;
    --text-light: #fff;
    --bg-light: #f5f5f5;
    --card-bg: #fff;
    --border-radius: 8px;
    --shadow-subtle: 0 4px 10px rgba(0,0,0,0.08);
    --accent-yellow: #fdd835;
}

/* === RESET BÁSICO === */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    width: 100%;
    font-family: Arial, sans-serif;
    line-height: 1.6;
    background-color: var(--bg-light);
    color: var(--text-dark);
    overflow-x: hidden;
}

/* === CONTENEDOR GENERAL === */
.wrap {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* === HERO BANNER === */
.hero-banner {
    background-color: var(--primary-blue);
    color: var(--text-light);
    padding: 80px 20px;
    text-align: center;
}

.hero-banner h1 {
    font-size: 2.8em;
    margin-bottom: 10px;
}

.hero-banner p {
    max-width: 700px;
    margin: 0 auto 30px;
    font-size: 1.1em;
}

.hero-banner .btn {
    display: inline-block;
    padding: 12px 25px;
    border-radius: 5px;
    font-weight: bold;
    text-decoration: none;
    transition: background 0.3s;
}

.btn-blue {
    background-color: var(--light-blue);
    color: var(--text-light);
    border: 2px solid var(--light-blue);
}

.btn-blue:hover {
    background-color: #316dd3;
}

.btn-white {
    background-color: var(--text-light);
    color: var(--primary-blue);
    border: 2px solid var(--text-light);
}

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

/* === SECCIONES === */
.section-title {
    text-align: center;
    font-size: 1.8em;
    margin: 40px 0 30px;
    color: var(--primary-blue);
}

/* === TARJETAS Y GRID === */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-bottom: 40px;
}

.card-grid .card {
    background: var(--card-bg);
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-subtle);
    text-align: center;
}

/* === PRODUCTOS / CATÁLOGO === */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-bottom: 40px;
}

.product-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    border: 1px solid #e0e0e0;
    padding: 20px;
    display: flex;
    flex-direction: column;
}

.product-card h4 {
    color: var(--primary-blue);
    margin-bottom: 5px;
}

.product-card .price {
    font-size: 1.4em;
    font-weight: bold;
    color: var(--primary-blue);
    margin: 10px 0;
}

.product-card .details {
    font-size: 0.9em;
    color: #666;
    margin-bottom: 15px;
}

.product-card .quote-btn {
    background-color: var(--accent-yellow);
    color: var(--text-dark);
    padding: 8px 15px;
    border-radius: 4px;
    text-align: center;
    text-decoration: none;
    font-weight: bold;
    margin-top: auto;
    transition: background 0.3s;
}

.product-card .quote-btn:hover {
    background-color: #fbc02d;
}

/* === FORMULARIO DE CONTACTO === */
.contact-form-section input,
.contact-form-section select,
.contact-form-section textarea {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border-radius: 4px;
    border: 1px solid #ccc;
}

.contact-form-section textarea {
    min-height: 120px;
}

.contact-form-section .btn {
    width: 100%;
    margin: 10px 0;
    text-align: center;
}

/* === MAPA / PLACEHOLDER === */
.map-placeholder {
    height: 300px;
    background: #ccc;
    text-align: center;
    line-height: 300px;
    color: #666;
    border-radius: var(--border-radius);
    margin-top: 20px;
}

/* === FOOTER === */
footer {
    text-align: center;
    padding: 20px;
    background: var(--primary-blue);
    color: var(--text-light);
    font-size: 0.9em;
}

footer .back-to-top-link {
    display: block;
    padding-bottom: 5px;
    font-weight: bold;
    color: var(--accent-yellow);
    text-decoration: none;
    transition: color 0.3s;
}

footer .back-to-top-link:hover {
    color: #ffd600;
}

/* === NAVEGACIÓN SUPERIOR === */
.topnav {
    width: 100%;
    background: #0a0a23;
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.topnav nav {
    display: flex;
    justify-content: center;
    gap: 40px;
}

.topnav a {
    color: #fff;
    font-weight: bold;
    text-decoration: none;
    font-size: 18px;
}

.topnav a:hover {
    color: #2fb3ff;
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
    .hero-banner {
        padding: 60px 20px;
    }
    .hero-banner h1 {
        font-size: 2em;
    }
    .engineering-services {
        flex-direction: column;
    }
}