body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #fff;
    color: #333;
}
.header {
    background: #111;
    color: white;
    display: flex;
    justify-content: space-between;
    padding: 1rem 2rem;
    align-items: center;
}
.logo {
    max-height: 80px;
}
.nav {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 0;
}
.nav li a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}
.hero {
    background: #f0f0f0;
    text-align: center;
    padding: 4rem 2rem;
}
.content {
    padding: 2rem;
    max-width: 900px;
    margin: auto;
}
.footer {
    background: #222;
    color: white;
    text-align: center;
    padding: 1rem;
    margin-top: 3rem;
}
form {
    max-width: 500px;
    margin-top: 1rem;
}
.form-group {
    margin-bottom: 1rem;
}
input[type="text"],
input[type="email"],
textarea {
    width: 100%;
    padding: 0.5rem;
    font-size: 1rem;
    border: 1px solid #ccc;
    border-radius: 4px;
}
button[type="submit"] {
    background-color: #111;
    color: white;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}
button[type="submit"]:hover {
    background-color: #444;
}

/* Menu responsivo com transição real para dispositivos móveis */
.menu-toggle {
    display: none;
    background-color: #111;
    color: white;
    border: none;
    font-size: 1.2rem;
    padding: 0.5rem 1rem;
    cursor: pointer;
}
@media (max-width: 768px) {
    .menu-toggle {
        display: block;
        margin-top: 1rem;
    }
    nav {
        width: 100%;
    }
    .nav {
        display: none;
        flex-direction: column;
        background-color: #111;
        width: 100%;
        padding: 1rem;
        margin-top: 0.5rem;
    }
    .nav.open {
        display: flex;
    }
    .nav li {
        margin: 0.5rem 0;
    }
}

.menu-toggle {
    display: none;
    background-color: #111;
    color: white;
    border: none;
    font-size: 1.2rem;
    padding: 0.5rem 1rem;
    cursor: pointer;
}
@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }
    .nav {
        display: none;
        flex-direction: column;
        background-color: #111;
        padding: 1rem;
        width: 100%;
    }
    .nav.open {
        display: flex;
    }
    .nav li {
        margin-bottom: 1rem;
    }
    .nav li a {
        color: white;
        text-decoration: none;
    }
}

/* Marca d'água animada com cubo */
.marca-dagua {
    position: fixed;
    bottom: 10px;
    right: 10px;
    opacity: 0.08;
    z-index: 0;
    animation: montarCubo 5s infinite linear;
}
.marca-dagua img {
    width: 100px;
}

@keyframes montarCubo {
    0%   { transform: rotateY(0deg) scale(0.8); opacity: 0.05; }
    50%  { transform: rotateY(180deg) scale(1); opacity: 0.12; }
    100% { transform: rotateY(360deg) scale(0.8); opacity: 0.05; }
}

/* TESTE: Marca d'água animada central com maior visibilidade */
.marca-dagua-teste {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0.3;
    z-index: 0;
    animation: montarCubo 6s infinite linear;
}
.marca-dagua-teste img {
    width: 150px;
    height: auto;
}

@keyframes montarCubo {
    0%   { transform: translate(-50%, -50%) rotateY(0deg) scale(0.9); opacity: 0.15; }
    50%  { transform: translate(-50%, -50%) rotateY(180deg) scale(1.1); opacity: 0.4; }
    100% { transform: translate(-50%, -50%) rotateY(360deg) scale(0.9); opacity: 0.15; }
}

/* Marca d'água central com tamanho aumentado */
.marca-dagua-central {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: rgba(0, 0, 0, 0.1);
    border-radius: 50%;
    padding: 1rem;
    opacity: 0.02;
    z-index: 0;
    pointer-events: none;
}
.marca-dagua-central img {
    width: 480px;
    height: auto;
}

@keyframes montarCubo {
    0%   { transform: translate(-50%, -50%) rotateY(0deg) scale(0.95); opacity: 0.08; }
    50%  { transform: translate(-50%, -50%) rotateY(180deg) scale(1.1); opacity: 0.15; }
    100% { transform: translate(-50%, -50%) rotateY(360deg) scale(0.95); opacity: 0.08; }
}