*
{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
section
{
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 0vh;
    background: #8bd0d0;
}
.loader
{
    position: center;
    width: 0px;
    height: 240px;
    filter: url(#gooey);
    animation: animate 16s linear infinite;
}
.loader span
{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
    transform: rotate(calc(45deg * var(--i)));

}
.loader span::before
{
    content: '';
    position: absolute;
    top: 0;
    left: calc(50% - 20%);
    width: 40px;
    height: 40px;
    background: linear-gradient(45deg, #c7eeff, #039cf4);
    border-radius: 50%;
    box-shadow: 0 0 30px #b204e8;
}
.rotate
{
    animation: animate 4s ease-in-out infinite;
    animation-delay: calc(-0.2s * var(--j));
}
@keyframes animate
{
    0%
    {
        transform: rotate(0deg);
    }
    100%
    {
        transform: rotate(360deg);
    }
}
svg{
    width: 0;
    height: 0;
}
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600&display=swap');
body {
    font-family: 'Poppins', sans-serif;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: #f0f4f8;
    color: #333;
}
h1 {
    text-align: center;
    color: #2c3e50;
    font-size: 2.5em;
    margin-bottom: 30px;
}
#valueForm {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 20px;
}
label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
}
input[type="number"] {
    width: 100%;
    padding: 8px;
    border: 1px solid #bdc3c7;
    border-radius: 4px;
    box-sizing: border-box;
}
button {
    display: block;
    width: 200px;
    margin: 10px auto;
    padding: 10px;
    background-color: #f0f4f8;
    color: rgb(0, 0, 0);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
}
button:hover {
    background-color: #f0f4f8;
}
#chartContainer {
    width: 100%;
    height: 600px;
    max-width: 600px;
    margin: 20px auto;
}
/* Stile per la finestra modale */
.modal {
    display: none;
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    overflow: auto;
}
.modal-content {
    background-color: #fff;
    margin: 10% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-width: 600px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}
.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.modal-header h2 {
    margin: 0;
    font-size: 24px;
}
.close {
    color: #aaa;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}
.close:hover,
.close:focus {
    color: black;
}

a
{
    position: relative;
    display: inline-block;
    padding: 12px 10px;
    color: #064e88;
    text-transform: none;
    letter-spacing: 3px;
    text-decoration: none;
    font-size: 15px;
    overflow: hidden;
    transition: 0.2s;
}
a:hover
{
    color: #255784;
    background: #2196f3;
    box-shadow: 0 0 10px #b204e8, 0 0 40px #2196f3, 0 0 80px #2196f3;
    transition-delay: 0.7s;
}
a span
{
    position: absolute;
    display: block;
}
a span:nth-child(1)
{
    top: 0;
    left: -100%;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg,transparent,#2196f3);
}
a:hover span:nth-child(1)
{
    left: 100%;
    transition: 1s;
}

a span:nth-child(3)
{
    bottom: 0;
    right: -100%;
    width: 100%;
    height: 2px;
    background: linear-gradient(270deg,transparent,#2196f3);
}
a:hover span:nth-child(3)
{
    right: 100%;
    transition: 1s;
    transition-delay: 0.5s;
}

a span:nth-child(2)
{
    top: -100%;
    right: 0;
    width: 2px;
    height: 100%;
    background: linear-gradient(180deg,transparent,#2196f3);
}
a:hover span:nth-child(2)
{
    top: 100%;
    transition: 1s;
    transition-delay: 0.25s;
}

a span:nth-child(4)
{
    bottom: -100%;
    left: 0;
    width: 2px;
    height: 100%;
    background: linear-gradient(360deg,transparent,#2196f3);
}
a:hover span:nth-child(4)
{
    bottom: 100%;
    transition: 1s;
    transition-delay: 0.75s;
}