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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    scroll-behavior: smooth;
}

.container {
    max-width: 1100px;
    margin: auto;
    padding: 60px 20px;
}

.bg-light {
    background: #f4f4f4;
}

/* Header & Nav */
header {
    background: #2c3e50;
    color: #fff;
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1100px;
    margin: auto;
    padding: 0 20px;
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
    margin-left: 20px;
    font-weight: bold;
    transition: 0.3s;
}

nav ul li a:hover {
    color: #3498db;
}

/* Hero Section */
.hero {
    height: 60vh;
    background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('https://images.unsplash.com/photo-1507842217343-583bb7270b66?auto=format&fit=crop&w=1350&q=80');
    background-size: cover;
    background-position: center;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 10px;
}

/* Livro Section */
.livro-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.placeholder-capa {
    width: 100%;
    height: 450px;
    background: #ddd;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: #666;
    border-radius: 8px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.btn-primary, .btn-compra {
    display: inline-block;
    padding: 12px 30px;
    background: #3498db;
    color: #fff;
    text-decoration: none;
    border-radius: 5px;
    margin-top: 20px;
    transition: 0.3s;
}

.btn-compra {
    background: #27ae60;
    font-size: 1.2rem;
}

.btn-primary:hover, .btn-compra:hover {
    filter: brightness(1.1);
}

/* Footer & Social */
footer {
    background: #2c3e50;
    color: #fff;
    padding: 40px 0;
    text-align: center;
}

.social-links {
    margin: 20px 0;
}

.social-links a {
    color: #fff;
    font-size: 1.8rem;
    margin: 0 15px;
    transition: 0.3s;
}

.social-links a:hover {
    color: #3498db;
}

/* Responsividade */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
    }
    
    nav ul {
        margin-top: 15px;
    }

    nav ul li {
        margin: 0 10px;
    }

    .livro-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-content h1 {
        font-size: 2rem;
    }
}