/* 1. Variáveis Globais e Reset */
:root {
    --primary-color: #00bcd4; /* Tom de azul (aqua) */
    --primary-color-hover: #ffffff;
    --background-color: #f4f4f4;
    --surface-color: #ffffff;
    --text-color: #333;
    --border-radius: 8px;
    --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --transition-speed: 0.3s;
}

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

/* 2. Layout Geral do Corpo da Página */
body {
    font-family: Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

/* 3. Container Principal (o card da aplicação) */
section {
    background-color: var(--surface-color);
    padding: 25px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    border: 2px solid var(--primary-color);
    width: 90%;
    max-width: 450px;
    text-align: center;
}

h1 {
    margin-bottom: 25px;
    color: #2c3e50;
    text-shadow: #333 1px 1px 1px;
}

/* 4. Estilos do Formulário */
form {
    display: flex;
    flex-direction: column;
    gap: 15px; /* Espaçamento entre os elementos do formulário */
    margin-bottom: 20px;
}

/* Estilo comum para input e select */
input[type="number"],
select {
    padding: 12px;
    border: 2px solid var(--primary-color);
    border-radius: var(--border-radius);
    width: 100%;
    text-align: center;
    font-size: 1em;
    transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
}

/* Feedback visual ao focar no elemento */
input[type="number"]:focus,
select:focus {
    outline: none;
    border-color: #2c3e50;
    box-shadow: 0 0 5px rgba(0, 188, 212, 0.5);
}

button {
    padding: 12px;
    background-color: var(--primary-color);
    color: black;
    border: 2px solid transparent; /* Adiciona borda transparente para não "pular" no hover */
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    font-size: large;
    font-weight: bold;
}

button:hover,
button:focus {
    outline: none;
    background-color: var(--primary-color-hover);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

/* 5. Estilos dos Parágrafos de Resultado */
p {
    margin: 10px 0;
    font-size: 1.2em;
    border: 2px solid var(--primary-color);
    padding: 10px;
    border-radius: var(--border-radius);
    transition: all var(--transition-speed) ease;
    background-color: #f9f9f9;
}

p:hover {
    transform: scale(1.05);
    background-color: var(--surface-color);
    box-shadow: var(--box-shadow);
}