/* Variables de Color (Estilo Industrial / Corporativo) */
:root {
    --primary: #1B2A4A;      /* Azul marino corporativo */
    --accent: #D97706;       /* Naranja industrial / construcción */
    --bg-light: #F8FAFC;     /* Gris claro limpio */
    --text-dark: #1E293B;    /* Texto principal */
    --text-muted: #64748B;   /* Texto secundario */
    --white: #FFFFFF;
}

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

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-dark);
    background-color: var(--bg-light);
    line-height: 1.6;
}

.container {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto;
}

/* Header & Navbar */
.navbar {
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 1rem 0;
}

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

.logo {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
}

.logo span {
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--text-muted);
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 600;
    font-size: 0.95rem;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--accent);
}

/* Botones */
.btn-primary {
    background-color: var(--accent);
    color: var(--white) !important;
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    transition: background 0.2s !important;
}

.btn-primary:hover {
    background-color: #B45309;
}

.btn-secondary {
    border: 2px solid var(--primary);
    color: var(--primary);
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary) 0%, #0F172A 100%);
    color: var(--white);
    padding: 5rem 0;
}

.hero-content {
    max-width: 700px;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.15rem;
    color: #94A3B8;
    margin-bottom: 2rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

/* Responsive básico */
@media (max-width: 768px) {
    .nav-links { display: none; } /* En siguiente paso añadimos menú móvil */
    .hero h1 { font-size: 1.8rem; }
}

/* Secciones */
.section {
    padding: 4rem 0;
}

.section-title {
    text-align: center;
    margin-bottom: 2.5rem;
}

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

.section-title p {
    color: var(--text-muted);
}

/* Grillas */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

/* Tarjetas de Servicios */
.card-service {
    background: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
    border-top: 4px solid var(--accent);
}

.card-service h3 {
    color: var(--primary);
    margin-bottom: 0.75rem;
}

.card-service ul {
    list-style: none;
    margin-top: 0.75rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.card-service ul li {
    margin-bottom: 0.4rem;
}

/* Tarjetas de Obras (Portafolio) */
.card-obra {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
}

.card-obra img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    background-color: #E2E8F0;
}

.card-obra-body {
    padding: 1.5rem;
}

.badge {
    background: #FEF3C7;
    color: #92400E;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    text-transform: uppercase;
}

/* Sección QR / Contacto */
.qr-box {
    background: var(--white);
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
    border: 1px solid #E2E8F0;
}

.qr-box img {
    max-width: 180px;
    margin: 1rem 0;
}