:root {
    --primary: #0a192f; /* Azul Marinho Profundo */
    --accent: #c5a059;  /* Dourado Militar */
    --text-white: #ffffff;
    --bg-light: #f4f4f4;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; }

body { background-color: var(--bg-light); color: #333; }

/* Navbar */
.navbar {
    display: flex; justify-content: space-between; align-items: center;
    padding: 20px 5%; background: var(--primary); color: white;
    position: sticky; top: 0; z-index: 1000;
}
.logo { font-size: 1.5rem; font-weight: bold; letter-spacing: 2px; }
.logo span { color: var(--accent); }
.nav-links { display: flex; list-style: none; align-items: center; }
.nav-links li { margin-left: 20px; }
.nav-links a { text-decoration: none; color: white; font-weight: 500; transition: 0.3s; }
.btn-login { background: var(--accent); padding: 8px 15px; border-radius: 5px; }

/* Hero Section */
.hero {
    height: 80vh;
    background: linear-gradient(rgba(10, 25, 47, 0.8), rgba(10, 25, 47, 0.8)), 
                url('https://images.unsplash.com/photo-1599342564771-417122df46e0?q=80&w=1200');
    background-size: cover; background-position: center;
    display: flex; justify-content: center; align-items: center; text-align: center; color: white;
}
.hero-content h1 { font-size: 3.5rem; margin-bottom: 20px; text-transform: uppercase; }
.cta-button {
    display: inline-block; padding: 15px 30px; background: var(--accent);
    color: var(--primary); font-weight: bold; text-decoration: none; border-radius: 5px; margin-top: 20px;
}

/* Grid de Cursos */
.container { padding: 60px 5%; }
.section-title { text-align: center; margin-bottom: 40px; font-size: 2rem; color: var(--primary); }
.course-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }

.course-card { background: white; border-radius: 10px; overflow: hidden; box-shadow: 0 5px 15px rgba(0,0,0,0.1); transition: 0.3s; }
.course-card:hover { transform: translateY(-10px); }
.course-card img { width: 100%; height: 200px; object-fit: cover; }
.card-body { padding: 20px; text-align: center; }
.btn-buy {
    display: block; width: 100%; padding: 12px; background: var(--primary);
    color: white; text-decoration: none; margin-top: 15px; border-radius: 5px;
}

/* Responsivo */
@media (max-width: 768px) {
    .hero-content h1 { font-size: 2.2rem; }
    .nav-links { display: none; } /* Idealmente aqui você faria um menu hamburguer */
}