*{
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
/* Container voor gecentreerde content */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-content: center;
    flex-wrap: wrap;

}



/* Hero sectie */
.hero {
    text-align: center;
    padding: 100px 20px;
    background-image: url('https://www.nasa.gov/sites/default/files/thumbnails/image/nasa-logo-web-rgb.png'); /* voorbeeld */
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center top;
}

.hero h2 {
    font-size: 36px;
    margin-top: 220px; /* ruimte onder logo */
}

/* Knoppen */
.btn {
    background-color: #45a29e;
    color: white;
    padding: 12px 30px;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
    margin: 10px;
    transition: background-color 0.3s, transform 0.2s;
}

.btn:hover {
    background-color: #66fcf1;
    transform: translateY(-2px);
}

/* Secties */
main {
    flex: 1; /* neemt alle beschikbare ruimte */
}

section {
    padding: 60px 20px;
    text-align: center;
}

section h3 {
    font-size: 28px;
    margin-bottom: 20px;
}


@keyframes fall {
    0% {transform: translateY(0) rotate(0deg);}
    100% {transform: translateY(100vh) rotate(360deg);}
}
/* Popup overlay */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none; /* verborgen standaard */
    justify-content: center;
    align-items: center;
    background: rgba(0,0,0,0.3);
    backdrop-filter: blur(10px); /* Motion blur effect */
}

/* Popup zelf */
.popup {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 0 20px rgba(0,0,0,0.5);
    max-width: 400px;
    text-align: center;
}

/* Actief maken van overlay */
.overlay.active {
    display: flex;
}

button {
    padding: 0.5rem 1rem;
    margin-top: 1rem;
    cursor: pointer;
    background-image: url(/images/tim.jpg);
    background-size: contain;
    background-position: center;
    background-repeat: inherit;
    border-radius: 50px;
    border: solid 2px black;
    color: white;
    font-size: 1rem;
    width: auto;
    height: 50px;
}