*{
    margin: 0;
    padding: 0;
    font-family: "Roboto", sans-serif;
}
.header{
    min-height: 100vh;
    width: 100%;
    background-image: linear-gradient(rgba(4,9,30,0.6),rgba(4,9,30,0.6)),url(images/banner.jpg);
    background-position: center;
    background-size: cover;
    position: relative;
    border-bottom: 5px solid #000;
}
body {
    background-image: linear-gradient(rgba(220, 220, 220, 0.8), rgba(220, 220, 220, 0.8)); /* Gradient kolorów */
    background-size: cover; /* Dopasowanie do wielkości ekranu */
    background-attachment: fixed; /* Zachowanie tła przy przewijaniu */
    background-repeat: no-repeat; /* Wyłączenie powtarzania */
}

nav{
    display: flex;
    padding: 2% 4%;
    justify-content: space-between;
    align-items: center;
}
nav img{
    width: 250px;
}
.nav-links{
    flex: 1;
    text-align: right;
}
.nav-links ul li{
    list-style: none;
    display: inline-block;
    padding: 8px 12px;
    position: relative;
}
.nav-links ul li a{
    color: #fff;
    text-decoration: none;
    font-size: 20px;
}
.nav-links ul li::after{
    content: '';
    width: 0%;
    height: 2px;
    background: #00ced1;
    display: block;
    margin: auto;
    transition: 0.5s;
}
.nav-links ul li:hover::after{
    width: 100%
}
.text-box{
    width: 90%;
    color: #fff;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    text-align: center;
}
.text-box h1{
    font-size: 85px;
    font-style: italic;
}
.text-box p{
    margin: 10px 0 40px;
    font-size: 20px;
    color: #fff;
}
.hero-btn{
    display: inline-block;
    text-decoration: none;
    color: #fff;
    border: 1px solid #fff;
    padding: 12px 34px;
    font-size: 13px;
    background: transparent;
    position: relative;
    cursor: pointer;
}
.hero-btn:hover{
    border: 1px solid #00ced1;
    background: #00ced1;
    transition: 1s;
}

nav .fa{
    display: none;
}


@media(max-width: 700px){
    .text-box h1{
        font-size: 20px;
    }
    .nav-links ul li{
        display: block;
    }
    .nav-links{
        position: absolute;
        background: #00ced1;
        height: 100vh;
        width: 200px;
        top: 0;
        right: -200px;
        text-align: left;
        z-index: 2;
        transition: 1s;
        
    }
    nav .fa{
        display: block;
        color: #fff;
        margin: 10px;
        font-size: 22px;
        cursor: pointer;
    }
    .nav-links ul{
        padding: 30px;   
    }
}
    
/*------- course -------*/

.course{
    width: 80%;
    margin: auto;
    text-align: center;
    padding-top: 100px;
    
}
h1{
    font-size: 36px;
    font-weight: 600;
}
p{
    color: #777;
    font-size: 14px;
    font-weight: 300;
    line-height: 22px;
    padding: 10px;
}

.row{
    margin-top: 5%;
    display: flex;
    justify-content: space-between;
}
.course-col{
    flex-basis: 31%;
    background: #FFF8DC;
    border-radius: 10px;
    margin-bottom: 5%;
    padding: 20px 12px;
    box-sizing: border-box;
    transition: 0.5s;
}
h3{
    text-align: center;
    font-weight: 600;
    margin: 10px 0;
}
.course-col:hover{
    box-shadow: 0 0 20px 0px rgba(0,0,0,0.2);
}
@media(max-width: 700px){
    .row{
        flex-direction: column;
    }
}

/*------- call to action -------*/
.cta{
    margin: 100px auto;
    width: 90%;
    background-image: linear-gradient(rgba(0,0,0,0.4),rgba(0,0,0,0.4)),url(images/banner2.jpg);
    background-position: center;
    background-size: cover;
    border-radius: 10px;
    text-align: center;
    padding: 100px 0;
}

.cta h1{
    color: #fff;
    margin-bottom: 40px;
    padding: 0;
}
.cta a{
    font-size: 18px;
}

.footer {
    width: 100%;
    text-align: center;
    padding: 30px 0;
    background-color: #f2f2f2; /* kolor tła stopki */
    margin-top: 50px; /* margines górny */
    border-top: 2px solid #000; /* obramowanie górne */
    border-bottom: 1px solid #ccc; /* obramowanie dolne */
}

.footer h4 {
    margin-bottom: 25px;
    margin-top: 20px;
    font-weight: 600;
}