/*
 * Cores padrão (Modo Claro)
 */
:root {
    --bg-color: #f7f7f7;
    --container-bg-color: #fff;
    --text-color: #333;
    --border-color: #ccc;
    --button-bg-color: #4CAF50;
    --button-hover-bg-color: #45a049;
    --attention-color: #ff3333;
}

/*
 * Cores para o Modo Escuro
 */
body.dark {
    --bg-color: #333;
    --container-bg-color: #444;
    --text-color: #fff;
    --border-color: #666;
    --button-bg-color: #555;
    --button-hover-bg-color: #777;
    --attention-color: #ff6666;
}

/*
 * Estilos Gerais e Resets
 */
body {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Montserrat', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.5s, color 0.5s;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    background-color: var(--container-bg-color);
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
    padding: 2rem;
    border-radius: 8px;
    width: 90%;
    max-width: 500px;
    text-align: center;
    transition: background-color 0.5s;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.title {
    font-size: 1.5rem;
    font-weight: 500;
}

.icon-mode {
    cursor: pointer;
    font-size: 1.5rem;
    color: var(--text-color);
}

.form p {
    margin-bottom: 1rem;
    font-size: 1rem;
}

#date {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    margin-bottom: 1rem;
    background-color: var(--container-bg-color);
    color: var(--text-color);
}

#result-box {
    margin-top: 1rem;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    min-height: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
}

#result {
    font-weight: 500;
}

.btn {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--button-bg-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s;
    margin-top: 1.5rem;
}

.btn:hover {
    background-color: var(--button-hover-bg-color);
}

.attention {
    color: var(--attention-color);
    font-weight: bold;
}

/*
 * Media Queries para Responsividade
 */
@media (max-width: 600px) {
    .container {
        width: 95%;
        padding: 1rem;
    }

    .title {
        font-size: 1.2rem;
    }

    .icon-mode {
        font-size: 1.2rem;
    }

    #date, .btn {
        font-size: 0.9rem;
    }
}