/* Variáveis de Design System */
:root {
    --primary: #1a1a1a;
    --accent: #e67e22; /* Laranja construção: energia e ação */
    --text-main: #333333;
    --text-light: #666666;
    --bg-light: #f9f9f9;
    --white: #ffffff;
    --transition: all 0.3s ease;
}

/* Reset Básico */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: 'Inter', -apple-system, sans-serif; color: var(--text-main); line-height: 1.6; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 5%; }
.section-padding { padding: 80px 0; }

/* Header & Menu Mobile */
.main-header {
    background: var(--white);
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.nav-links { display: flex; list-style: none; align-items: center; gap: 2rem; }

.nav-links a { text-decoration: none; color: var(--primary); font-weight: 500; transition: var(--transition); }
.nav-links a:hover { color: var(--accent); }

/* Mobile Menu Button */
.mobile-menu-toggle { display: none; background: none; border: none; cursor: pointer; padding: 10px; }
.hamburger { display: block; width: 25px; height: 2px; background: var(--primary); position: relative; }
.hamburger::before, .hamburger::after { content: ''; position: absolute; width: 25px; height: 2px; background: var(--primary); left: 0; }
.hamburger::before { top: -8px; }
.hamburger::after { bottom: -8px; }

/* Hero Section - Mobile First */
.hero {
    min-height: 70vh;
    background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('https://images.unsplash.com/photo-1541888946425-d81bb19240f5?q=80&w=1200') center/cover;
    display: flex;
    align-items: center;
    color: var(--white);
}

.hero h1 { font-size: 2.5rem; line-height: 1.2; margin-bottom: 1.5rem; }
.hero h1 span { color: var(--accent); }

/* Grid de Serviços */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.service-card {
    background: var(--bg-light);
    padding: 2.5rem;
    border-radius: 8px;
    transition: var(--transition);
}

.service-card:hover { transform: translateY(-5px); box-shadow: 0 10px 20px rgba(0,0,0,0.1); }

/* Buttons */
.btn-primary { background: var(--accent); color: var(--white); padding: 1rem 2rem; text-decoration: none; border-radius: 4px; font-weight: bold; display: inline-block; }

/* Responsividade (Mobile) */
@media (max-width: 768px) {
    .mobile-menu-toggle { display: block; }
    .nav-links {
        display: none; /* Escondido por padrão no mobile */
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--white);
        padding: 2rem;
        box-shadow: 0 10px 10px rgba(0,0,0,0.1);
    }
    .nav-links.active { display: flex; }
    .hero h1 { font-size: 2rem; }
}