:root {
    --bg-color: #FAFAFA;       /* Cinza perolado suave para não cansar a vista */
    --card-bg: #FFFFFF;        /* Branco nos cards de produto */
    --text-main: #111111;      /* Preto denso para leitura limpa */
    --text-muted: #555555;     /* Cinza para subtítulos */
    --border-color: #E0E0E0;   /* Traços finos em estética Line Art */
    
    --font-title: 'Cinzel', serif;
    --font-body: 'Montserrat', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: var(--font-body);
    line-height: 1.6;
    text-align: center;
    padding: 20px;
}

.hero {
    padding: 60px 20px 40px;
}

.brand-title {
    font-family: var(--font-title);
    font-size: 2.4rem;
    letter-spacing: 5px;
    font-weight: 600;
    margin-bottom: 8px;
}

.brand-subtitle {
    font-size: 0.95rem;
    letter-spacing: 2px;
    color: var(--text-muted);
    text-transform: uppercase;
}

.container {
    max-width: 500px; /* Largura ideal para leitura no celular (sem sobrecarga TDAH) */
    margin: 0 auto;
}

.book-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 35px 25px;
    margin-bottom: 25px;
    border-radius: 2px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.book-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

.badge {
    font-size: 0.75rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--text-muted);
    display: block;
    margin-bottom: 10px;
}

.book-card h2 {
    font-family: var(--font-title);
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.book-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 25px;
}

.btn-amazon {
    display: inline-block;
    width: 100%;
    padding: 14px;
    border: 1px solid var(--text-main);
    color: var(--text-main);
    background: transparent;
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 2px;
    text-transform: uppercase;
    transition: all 0.3s ease;
}

.btn-amazon:hover {
    background-color: var(--text-main);
    color: #FFFFFF;
}

footer {
    margin-top: 50px;
    font-size: 0.8rem;
    color: var(--text-muted);
}