:root {
    --primary: #1E88E5;       /* Azul MSR */
    --primary-dark: #1565C0;
    --secondary: #424242;
    --bg-body: #F4F6F8;       /* Fundo suave */
    --bg-card: #FFFFFF;
    --text-main: #333333;
    --success: #43A047;
    --error: #E53935;
}

body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* --- HEADER (Estilo Rifbot) --- */
header {
    background: #fff;
    border-bottom: 3px solid var(--primary);
    padding: 0 5%;
    height: 70px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo-container { font-size: 1.5rem; font-weight: 800; color: var(--primary-dark); display: flex; align-items: center; gap: 10px; }
.logo-container img { height: 40px; }

nav a {
    color: var(--secondary);
    text-decoration: none;
    font-weight: 600;
    margin-left: 25px;
    font-size: 0.95rem;
    transition: color 0.3s;
}
nav a:hover { color: var(--primary); }

.btn-nav {
    background-color: var(--primary);
    color: white !important;
    padding: 8px 20px;
    border-radius: 4px;
    transition: background 0.3s;
}
.btn-nav:hover { background-color: var(--primary-dark); }

/* --- HERO SECTION (Banner Principal) --- */
.hero {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    color: white;
    text-align: center;
    padding: 80px 20px;
    margin-bottom: 40px;
}
.hero h1 { font-size: 3rem; margin: 0 0 10px 0; font-weight: 800; }
.hero p { font-size: 1.2rem; opacity: 0.9; max-width: 700px; margin: 0 auto 30px auto; }
.hero .cta-btn {
    background: white;
    color: var(--primary-dark);
    padding: 12px 30px;
    font-size: 1.1rem;
    font-weight: bold;
    text-decoration: none;
    border-radius: 30px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    transition: transform 0.2s;
}
.hero .cta-btn:hover { transform: scale(1.05); }

/* --- GRID DE PRODUTOS --- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section-title { text-align: center; font-size: 2rem; color: var(--secondary); margin-bottom: 40px; }

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.card {
    background: var(--bg-card);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
    transition: transform 0.3s, box-shadow 0.3s;
    border-top: 4px solid transparent;
}
.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    border-top: 4px solid var(--primary);
}

.card-header { padding: 20px; background: #f9f9f9; border-bottom: 1px solid #eee; text-align: center; }
.card-header h3 { margin: 0; color: var(--primary-dark); }
.card-body { padding: 30px; text-align: center; }
.card-body ul { list-style: none; padding: 0; margin-bottom: 25px; text-align: left; }
.card-body li { margin-bottom: 10px; color: #555; font-size: 0.95rem; }
.card-body li::before { content: "✔"; color: var(--success); margin-right: 8px; font-weight: bold; }

./* --- A CONFIGURAÇÃO DO CARD --- */
.card {
    background: var(--bg-card);
    border-radius: 12px; /* Bordas mais arredondadas (mais amigável) */
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
    transition: transform 0.3s, box-shadow 0.3s;
    border-top: 4px solid transparent;
    
    /* FLEXBOX: Essencial para alinhar o botão no fundo */
    display: flex;
    flex-direction: column; 
    height: 100%; /* Garante que todos os cards tenham a mesma altura visual */
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.15);
    border-top: 4px solid var(--primary);
}

.card-header {
    padding: 25px;
    background: #f9f9f9;
    border-bottom: 1px solid #eee;
    text-align: center;
}

/* --- O CORPO DO CARD (ONDE ESTÁ O BOTÃO) --- */
.card-body {
    padding: 30px;
    
    /* FLEXBOX PARA ALINHAMENTO INTERNO */
    display: flex;
    flex-direction: column;
    justify-content: space-between; /* Empurra o botão para o final */
    flex-grow: 1; /* O corpo ocupa todo o espaço restante */
    align-items: center; /* CENTRALIZA O BOTÃO HORIZONTALMENTE */
}

.card-body ul {
    list-style: none;
    padding: 0;
    margin-bottom: 30px;
    text-align: left; /* Mantém a lista alinhada à esquerda (melhor leitura) */
    width: 100%; /* Garante que a lista use a largura disponível */
}

.card-body li {
    margin-bottom: 12px;
    color: #555;
    font-size: 0.95rem;
    padding-left: 10px;
}

/* --- O BOTÃO CENTRALIZADO E BONITO --- */
.btn-buy {
    display: inline-block;
    width: auto; /* Não ocupa 100% da tela, fica mais elegante */
    min-width: 180px; /* Tamanho mínimo para padronizar */
    padding: 12px 30px;
    
    background-color: var(--primary);
    color: white;
    text-align: center;
    text-decoration: none;
    font-weight: bold;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
    
    border-radius: 30px; /* Botão arredondado (Pill shape) - Muito mais moderno */
    transition: all 0.3s ease;
    box-shadow: 0 4px 10px rgba(30, 136, 229, 0.3); /* Sombra suave na cor do botão */
    
    /* Garante que fique no fundo se usar flex no pai */
    margin-top: auto; 
}

.btn-buy:hover {
    background-color: var(--primary-dark);
    transform: scale(1.05); /* Cresce levemente ao passar o mouse */
    box-shadow: 0 6px 15px rgba(30, 136, 229, 0.5);
}

/* --- FORMULÁRIOS (Login/Register) --- */
.auth-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 40px 0;
}
.auth-box {
    background: white;
    width: 100%;
    max-width: 450px;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 5px 25px rgba(0,0,0,0.08);
}
.auth-box h2 { text-align: center; color: var(--primary-dark); margin-bottom: 30px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 8px; font-weight: 600; color: #444; }
.form-group input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    box-sizing: border-box; /* Importante para não quebrar layout */
}
.form-group input:focus { border-color: var(--primary); outline: none; }

/* --- FOOTER --- */
footer {
    background-color: #263238;
    color: #cfd8dc;
    text-align: center;
    padding: 30px;
    margin-top: auto;
}