* {
    box-sizing: border-box;
    font-family: 'Segoe UI', sans-serif;
}

body {
    margin: 0;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: 0.3s;
}

/* Temas */
body.light {
    background: linear-gradient(135deg, #e3f2fd, #ffffff);
    color: #000;
}

body.dark {
    background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
    color: #fff;
}

/* Layout */
.app {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Card */
.card {
    margin-top: 20px;
    padding: 25px;
    border-radius: 20px;
    backdrop-filter: blur(15px);
    background: rgba(255,255,255,0.1);
    box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

/* Inputs */
input {
    width: 100%;
    padding: 12px;
    border-radius: 10px;
    border: none;
    margin-top: 10px;
}

/* Botão */
button {
    width: 100%;
    padding: 12px;
    margin-top: 15px;
    border-radius: 10px;
    border: none;
    background: #4facfe;
    color: white;
    cursor: pointer;
    transition: 0.2s;
}

button:hover {
    transform: scale(1.05);
    background: #007bff;
}

/* Resultado */
#resultado {
    margin-top: 20px;
    line-height: 1.6;
    font-size: 18px;
    opacity: 0;
    transform: translateY(10px);
    transition: 0.3s;
}

#resultado.show {
    opacity: 1;
    transform: translateY(0);
}

/* Footer */
footer {
    text-align: center;
    margin-top: 15px;
    font-size: 12px;
    opacity: 0.7;
}