* {
    box-sizing: border-box;
}
body {
    margin:0;
    font-family:Arial, sans-serif;
    background-color:rgb(4, 4, 37);
}

header {
    background:rgb(4, 4, 37);
    color: white;
    text-align: center;
    padding: 30px;
    position: absolute; 
    top: 0;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: space-between; 
    align-items: center;
    padding: 1rem 2rem;
    z-index: 10; 
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: white;
}

nav {
    background-color: rgb(4, 4, 37);
    backdrop-filter: blur(5px);
}

nav ul {
    list-style: none;
    text-align: center;
    margin: 0;
    padding: 0;
}

nav ul::after{
    content:"";
    display:block;
    clear:both;
}

nav ul li {
    float: left;
}

nav ul li a {
    color: white;
    text-decoration: none;
    padding:18px 20px;
    float: left;
    position: relative;
}

nav ul li a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 10px;
    width: 0;
    height: 3px;
    background: limegreen;
    transition: 0.3s;
}

nav ul li a:hover::after {
    width:100%;
}

.courses{
    color: white;
    max-width:1200px;
    margin:30px auto;
    padding:60px;
    text-align:center;
}

.courses h1{
    margin-bottom:30px;
}

.course-card__img{
    width: 100%;
    height: 180px; 
    object-fit: cover; 
    border-radius: 10px;
    display: block;
}

.courses-container{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:25px;
}

.course-card{
    background:white;
    color:#222;
    padding:20px;
    border-radius:10px;
    position:relative;
    overflow:hidden;
    box-shadow:0 10px 25px rgba(0,0,0,0.2);
    transition:0.3s;
}

.course-card:hover{
    transform:translateY(-8px);
    box-shadow:0 20px 40px rgba(0,0,0,0.3);
}

.course-card::before{
    content:"";
    position:absolute;
    top:0;
    left:-100%;
    width:100%;
    height:100%;
    background:linear-gradient(120deg,transparent,rgba(255,255,255,0.4),transparent);
    transition:0.6s;
}

.course-card:hover::before{
    left:100%;
}

.course-card--orange{
    background:rgb(183,130,62);
}

.course-card h3{
    position:relative;
    display:inline-block;
}

.course-card h3:hover::after{
    width:100%;
}

.course-card p {
    margin:0 0 15px 0; 
    line-height:1.5;
}

.btn{
    display:inline-block;
    margin-top:15px;
    background:rgb(4,4,37);
    color:white;
    padding:12px 25px;
    border-radius:8px;
    text-decoration:none;
    font-weight:bold;
    transition:0.3s;
}

.course-card .btn:hover{
    background:limegreen;
    transform:scale(1.05);
}

.course-card--orange .btn:hover{
    background:white;
    color:rgb(4,4,37);
}

footer {
    clear: both;
    background-color: #040425;
    color: #fff;
    padding: 2rem 1rem;
    text-align: center;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
    gap: 2rem;
    max-width:1100px;
    margin:auto;
    margin-bottom: 1rem;
}

.footer-content a {
    color: limegreen;
    text-decoration: none;
}

.footer-content form input,
.footer-content form textarea {
    width: 100%;
    max-width: 250px;
    margin-bottom: 0.5rem;
    padding: 0.5rem;
    border-radius: 5px;
    border: none;
}

.footer-content form button {
    padding: 0.5rem 1rem;
    background-color: limegreen;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: 0.3s;
}

.footer-content form button:hover {
    background-color: #32cd32;
}
.footer-bottom {
    margin-top: 1rem;
    font-size: 0.9rem;
    color: #aaa;
}