/* RESET & VARIABLES */
:root {
    --primary-color: #d32f2f; /* Rojo de seguridad/construcción */
    --primary-dark: #b71c1c;
    --secondary-color: #1e293b; /* Gris oscuro elegante */
    --text-color: #334155;
    --bg-light: #f8fafc;
    --white: #ffffff;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    color: var(--text-color);
    line-height: 1.6;
    background-color: var(--white);
}

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

/* BOTONES & UI */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 6px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: var(--transition);
}

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

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

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

.btn-secondary:hover {
    background-color: #0f172a;
}

.btn-block {
    width: 100%;
    justify-content: center;
}

/* HEADER */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    z-index: 1000;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--secondary-color);
    text-decoration: none;
}

.logo span {
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav-link {
    text-decoration: none;
    color: var(--secondary-color);
    font-weight: 500;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary-color);
}

.hamburger {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--secondary-color);
    cursor: pointer;
}

/* HERO SECTION */
.hero {
    padding: 140px 0 80px;
    background: linear-gradient(rgba(30, 41, 59, 0.85), rgba(30, 41, 59, 0.85)), url('https://images.unsplash.com/photo-1541888946425-d0fbb186a5b7?auto=format&fit=crop&w=1350&q=80') center/cover;
    color: var(--white);
    text-align: center;
}

.badge {
    background-color: var(--primary-color);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
}

.hero h1 {
    font-size: 2.5rem;
    margin: 20px 0;
}

.hero p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 30px;
    color: #cbd5e1;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

/* SERVICIOS */
.services {
    padding: 80px 0;
    background-color: var(--bg-light);
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 2rem;
    color: var(--secondary-color);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.service-card {
    background: var(--white);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    transition: var(--transition);
}

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

.icon-box {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.service-card h3 {
    margin-bottom: 10px;
    color: var(--secondary-color);
}

/* CARACTERÍSTICAS / NOSOTROS */
.features {
    padding: 80px 0;
}

.features-list {
    list-style: none;
    margin-top: 20px;
}

.features-list li {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.features-list i {
    color: var(--primary-color);
}

/* CONTACTO */
.contact {
    padding: 80px 0;
    background-color: var(--bg-light);
}

.contact-box {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    background: var(--white);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}

.contact-info h2 {
    margin-bottom: 15px;
    color: var(--secondary-color);
}

.info-item {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-top: 20px;
    font-weight: 500;
}

.info-item i {
    color: var(--primary-color);
    font-size: 1.2rem;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #cbd5e1;
    border-radius: 6px;
    outline: none;
}

.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    border-color: var(--primary-color);
}

/* WHATSAPP FLOAT */
.whatsapp-float {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: #25d366;
    color: white;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    box-shadow: 2px 2px 10px rgba(0,0,0,0.2);
    z-index: 100;
    text-decoration: none;
}

/* FOOTER */
footer {
    background-color: var(--secondary-color);
    color: var(--white);
    text-align: center;
    padding: 20px 0;
}

/* RESPONSIVE */
@media (max-width: 768px) {
    .hamburger { display: block; }
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: var(--white);
        flex-direction: column;
        justify-content: center;
        transition: var(--transition);
    }
    .nav-menu.active { left: 0; }
    .contact-box { grid-template-columns: 1fr; }
    .hero h1 { font-size: 1.8rem; }
}