/* Spezifische Header-Stile */
header {
    padding: 70px 25px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 40px;
    flex-wrap: wrap;
}

.header_text {
    width: 750px;
}

.subheading {
    margin-top: 25px;
    color: gray;
    text-align: center;
}

header nav { /* Nur Navigation im Header */
    margin-bottom: 120px;
}

header nav ul { /* Nur Navigation im Header */
    list-style: none;
    display: flex;
    justify-content: space-between;
    gap: 20px;
}

header nav a { /* Nur Links im Header */
    color: var(--secondary-text-color);
    text-decoration: none;
    position: relative;
    padding: 3px;
}

header nav a:hover { /* Nur Hover-Effekt im Header */
    color: var(--text-color);
}

header nav a::after { /* Unterstriche nur im Header */
    content: '';
    height: 2px;
    width: 0%;
    background: var(--main-brand-color);
    position: absolute;
    bottom: 0;
    left: 0;
    transition: 150ms ease-in-out;
}

header nav a:hover::after { /* Hover-Effekt für Unterstriche nur im Header */
    width: 100%;
}

/* Hamburger-Menü und responsive Anpassungen */
#toggle_button {
    display: none;
}

label[for="toggle_button"] {
    display: none;
}

label[for="toggle_button"] span {
    font-size: 40px;
    display: flex;
    align-items: flex-start;
}

/* Kreiselemente im Header */
.circle {
    height: 500px;
    width: 500px;
    max-height: 80vw;
    max-width: 80vw;
    overflow: hidden;
    border-radius: 50%;
    border: 20px solid var(--main-brand-color);
    display: flex;
    justify-content: center;
    align-items: center;
}

.circle img {
    height: 100%;
}

/* Responsive Anpassungen für den Header */
@media (max-width: 800px) {
    .header_text {
        height: 100%;
        max-width: 100%;
        font-size: 5vw;
        text-align: center;
    }
    header nav {
        margin-bottom: 10vw;
        text-align: center;
    }
    .subheading {
        text-align: center;
        font-size: 4vw;
    }
}

@media (max-width: 850px) {
    .circle {
        height: 275px;
        width: 275px;
        max-height: 80vw;
        max-width: 80vw;
    }
}

@media (max-width: 975px) {
    header nav {
        position: absolute;
        top: 0;
        left: 0;
        background-color: var(--secondary-color);
        padding: 15px;
        border-radius: 0 0 25px 0;
    }
    header nav ul {
        display: none;
        flex-direction: column;
    }
    #toggle_button:checked ~ ul {
        display: flex;
    }
    label[for="toggle_button"] {
        display: block;
    }
}

@media (max-width: 1080px) {
    .circle {
        height: 400px;
        width: 400px;
        max-height: 80vw;
        max-width: 80vw;
    }
}