*{
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
::selection{
    background: #3b8cff;
    color: white;
    }


body {
    background-image: url("../../images/main_bg.jpg");
    background-size: 100%;
    background-repeat: no-repeat;
    background-position: center;
    background-attachment: fixed;
    background-color: #071a3a;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: "Trebuchet MS", Verdana, sans-serif;
}


header{
    height: 55px;
    display: flex;
    justify-content: space-around;
    background: #dde8f6;
    align-items: center;
    border-bottom: 2.5px solid #3b8cff;
}


nav{
    width: 100%;
    display: flex;
    justify-content: space-around;
}


nav a{
    padding: 18px 24px;
    color: #0d1f3c;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s, transform 0.3s;
    font-size: 20px;
}


nav a:hover{
    color: #3b8cff;
    transform: translateY(-3px);
}


nav a.aktif{
    color: #1f5fd1;
}


main{
    flex: 1;
    padding: 40px 16px;
    display: flex;
    justify-content: center;
}


footer{
    height: 55px;
    background: #dde8f6;
    padding: 16px 30px;
    display: flex;
    justify-content: center;
    align-items: center;
    border-top: 2.5px solid #3b8cff;
}


#iletisim { font-size: 18px;}


/* SERTİFİKA MAİN */

.sertifikalar{
    width: 100%;
    max-width: 1000px;
}


.sertifikalar h1{
    margin-bottom: 20px;
    font-size: 35px;
    color: #dde8f6;
    text-align: center;
}


.izgara{
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(270px, 100%), 1fr));
    gap: 20px;
}


.sertifika{
    background: #dde8f6;
    border-radius: 12px;
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    transition: transform 0.3s, box-shadow 0.3s;
}


.sertifika:hover{
    transform: translateY(-5px);
    box-shadow: 0 0 18px #3b8cff;
}


.sertifika img{
    display: block;
    width: 100%;
    aspect-ratio: 3 / 2;
    object-fit: contain;
    background: #b9cdea;
    border-radius: 8px;
}


.sertifika h2{
    font-size: 15px;
    line-height: 1.3;
    color: #0d1f3c;
}


.sertifika p{
    margin-top: auto;
    font-size: 13px;
    color: #3a4f73;
}



/* MOBİL | AI */



@media (max-width: 600px) {

        body {
        background-size: cover;
        background-attachment: scroll;
    }

    nav {
        flex-wrap: wrap;
    }

    nav a {
        padding: 12px 14px;
        font-size: 14px;
    }

    header {
        height: auto;
        min-height: 55px;
    }

    footer {
        height: auto;
        min-height: 55px;
        text-align: center;
    }

    .sertifikalar h1 {
        font-size: 26px;
    }

}