:root {
    --primary: #2d5a27;
    --accent: #8bc34a;
    --text: #333;
    --bg: #ffffff;
    --card-bg: #f4f9f4;
}

.dark-mode {
    --bg: #121212;
    --text: #e0e0e0;
    --card-bg: #1e2e1e;
    --primary: #4caf50;
}

body {
    font-family: 'Segoe UI', sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    transition: all 0.4s ease;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 60px 20px;
}

header nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 5%;
    background: var(--primary);
    color: white;
    position: sticky;
    top: 0;
    z-index: 1000;
}

#hero {
    height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
}

.secao-flex {
    display: flex;
    align-items: center;
    gap: 40px;
}

.img-custom {
    width: 100%;
    border-radius: 15px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.bg-verde {
    background-color: var(--card-bg);
    border-radius: 20px;
    text-align: center;
}

.btn-acao, #btn-calcular, #btn-enviar {
    background: var(--accent);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 30px;
    cursor: pointer;
    font-weight: bold;
    transition: transform 0.3s ease, background 0.3s;
}

.btn-acao:hover, #btn-enviar:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(139, 195, 74, 0.4);
}

.hidden { display: none; }

.animate-fade {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; } to { opacity: 1; }
}

/* Responsividade */
@media (max-width: 768px) {
    .secao-flex { flex-direction: column; }
    #hero { height: 50vh; }
}