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

/* Body and root styling */
body, html {
    height: 100%;
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(45deg, #2C3E50, #4CA1AF);
    color: white;
}

.container {
    height: 100%;
    display: flex;
    flex-direction: column;
}

/* Header styling */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
}

.logo img {
    height: 50px;
    margin-right: 15px;
}

.logo h1 {
    font-size: 24px;
}

nav ul {
    list-style-type: none;
}

nav ul li {
    display: inline;
    margin: 0 10px;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: 600;
    position: relative;
}

nav ul li a.active::after,
nav ul li a:hover::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    height: 2px;
    width: 100%;
    background-color: white;
}

/* Main content styling */
main {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
}

.intro h2 {
    font-size: 36px;
    margin-bottom: 20px;
}

.intro p {
    margin-bottom: 40px;
    line-height: 1.6;
}

.btn {
    padding: 10px 20px;
    border: none;
    background-color: white;
    color: #2C3E50;
    font-weight: 600;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}

.btn:hover {
    background-color: #BDC3C7;
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

/* Grid of levels */
.levels h2 {
    text-align: center;
    margin: 40px 0;
}

.grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
    padding: 20px;
}

.grid-item {
    width: 200px;
    height: 200px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.grid-item:hover {
    transform: scale(1.1);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

/* Parallax Effect */
.parallax {
    perspective: 1px;
    height: 100vh;
    overflow-x: hidden;
    overflow-y: auto;
    transform-style: preserve-3d;
}

/* Particles Background */
#particles-js {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: -1;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgb(0,0,0);
    background-color: rgba(0,0,0,0.4);
    padding-top: 60px;
    transform: scale(0.7);
    opacity: 0;
    transition: transform 0.4s, opacity 0.4s;
}

.modal-content {
    background-color: #fefefe;
    margin: 5% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    color: black;
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
}

.close:hover,
.close:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}

.modal.show {
    transform: scale(1);
    opacity: 1;
}

/* Footer styling */
footer {
    padding: 20px;
    text-align: center;
    background-color: rgba(0, 0, 0, 0.1);
}

.secret {
    color: white;
    text-decoration: none;
    font-weight: 600;
}

.secret:hover {
    text-decoration: underline;
}