* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    color-scheme: dark;

    --hintergrund-dunkel: #050a20;
    --hintergrund-blau: #071d48;
    --hintergrund-violett: #311054;

    --weiss: #ffffff;
    --text-hell: rgba(255, 255, 255, 0.82);
    --text-dezent: rgba(255, 255, 255, 0.66);

    --violett: #9a5cff;
    --violett-hell: #bd8aff;
    --blau: #4da3ff;

    --glas: rgba(7, 15, 48, 0.72);
    --glas-rand: rgba(255, 255, 255, 0.16);
}

html {
    min-height: 100%;
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    overflow-x: hidden;

    font-family: Calibri, Arial, sans-serif;

    color: var(--weiss);
    background: var(--hintergrund-dunkel);
}

.seitenhintergrund {
    position: fixed;
    inset: 0;
    z-index: -10;

    overflow: hidden;

    background:
        radial-gradient(
            circle at 18% 45%,
            rgba(48, 130, 255, 0.38),
            transparent 34%
        ),
        radial-gradient(
            circle at 83% 33%,
            rgba(165, 55, 255, 0.34),
            transparent 38%
        ),
        linear-gradient(
            120deg,
            var(--hintergrund-blau) 0%,
            var(--hintergrund-dunkel) 48%,
            var(--hintergrund-violett) 100%
        );
}

.seitenhintergrund::before {
    content: "";

    position: absolute;
    inset: 0;

    opacity: 0.35;

    background-image:
        linear-gradient(
            rgba(255, 255, 255, 0.025) 1px,
            transparent 1px
        ),
        linear-gradient(
            90deg,
            rgba(255, 255, 255, 0.025) 1px,
            transparent 1px
        );

    background-size: 55px 55px;

    mask-image: linear-gradient(
        to bottom,
        transparent,
        black 22%,
        black 80%,
        transparent
    );
}

.sterne {
    position: absolute;
    inset: 0;

    opacity: 0.75;

    background-image:
        radial-gradient(
            circle,
            rgba(255, 255, 255, 0.85) 0 1px,
            transparent 1.5px
        ),
        radial-gradient(
            circle,
            rgba(151, 196, 255, 0.75) 0 1px,
            transparent 1.5px
        );

    background-position:
        0 0,
        35px 24px;

    background-size:
        92px 92px,
        137px 137px;
}

.licht {
    position: absolute;

    border-radius: 50%;

    filter: blur(100px);
    pointer-events: none;
}

.licht-links {
    left: -180px;
    bottom: -180px;

    width: 650px;
    height: 650px;

    background: rgba(31, 126, 255, 0.28);
}

.licht-rechts {
    top: -160px;
    right: -120px;

    width: 680px;
    height: 680px;

    background: rgba(155, 55, 255, 0.28);
}

.planet {
    position: absolute;

    border-radius: 50%;

    pointer-events: none;

    box-shadow:
        inset -34px -26px 60px rgba(0, 0, 0, 0.6),
        inset 20px 18px 45px rgba(255, 255, 255, 0.15),
        0 0 80px rgba(154, 92, 255, 0.28);
}

.planet-gross {
    top: 12%;
    right: 5%;

    width: min(28vw, 440px);
    aspect-ratio: 1;

    opacity: 0.34;

    background:
        radial-gradient(
            circle at 35% 30%,
            rgba(179, 126, 255, 0.95),
            rgba(76, 62, 190, 0.8) 34%,
            rgba(24, 26, 91, 0.95) 72%
        );
}

.planet-klein {
    top: 13%;
    right: 30%;

    width: 65px;
    height: 65px;

    opacity: 0.28;

    background:
        radial-gradient(
            circle at 35% 30%,
            #c18aff,
            #6134ad 58%,
            #23154e
        );
}

.kopfbereich {
    position: fixed;
    top: 22px;
    left: 50%;
    z-index: 100;

    width: min(1180px, calc(100% - 44px));
    min-height: 68px;

    display: flex;
    align-items: center;
    justify-content: space-between;

    padding: 0 28px;

    transform: translateX(-50%);

    background: var(--glas);
    border: 1px solid var(--glas-rand);
    border-radius: 24px;

    box-shadow:
        0 18px 50px rgba(0, 0, 0, 0.28),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);

    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
}

.logo {
    color: var(--weiss);
    text-decoration: none;

    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: 0.01em;
}

.navigation {
    display: flex;
    align-items: center;
    gap: 30px;
}

.navigation a {
    position: relative;

    padding: 24px 0 22px;

    color: var(--text-hell);
    text-decoration: none;

    font-size: 1rem;
    font-weight: 600;

    transition:
        color 180ms ease,
        opacity 180ms ease;
}

.navigation a:hover,
.navigation a.aktiv {
    color: var(--weiss);
}

.navigation a.aktiv::after {
    content: "";

    position: absolute;
    right: 0;
    bottom: 10px;
    left: 0;

    height: 3px;

    border-radius: 99px;

    background: linear-gradient(
        90deg,
        var(--violett),
        var(--violett-hell)
    );
}

.startseite {
    position: relative;

    min-height: 100vh;

    display: flex;
    align-items: center;
    justify-content: center;

    padding: 128px 70px 44px;
}

.hero {
    width: min(1180px, 100%);

    display: grid;
    grid-template-columns: minmax(330px, 0.88fr) minmax(500px, 1.12fr);
    align-items: center;
    gap: clamp(48px, 5vw, 82px);
}

.avatar-bereich {
    position: relative;

    min-height: 520px;

    display: flex;
    align-items: center;
    justify-content: center;
}

.avatar-bereich::after {
    content: "";

    position: absolute;
    right: 12%;
    bottom: 4%;
    left: 12%;

    height: 48px;

    border-radius: 50%;

    background: rgba(1, 6, 24, 0.5);

    filter: blur(20px);
}

.avatar-licht {
    position: absolute;

    width: 450px;
    height: 450px;

    border-radius: 50%;

    background:
        radial-gradient(
            circle,
            rgba(82, 151, 255, 0.25),
            transparent 68%
        );

    filter: blur(18px);
}

.avatar {
    position: relative;
    z-index: 2;

    display: block;

    width: min(100%, 390px);
    max-height: 510px;

    object-fit: contain;
}

.hero-inhalt {
    position: relative;
    z-index: 2;

    padding-top: 16px;
}

.uebertitel {
    margin-bottom: 10px;

    color: var(--violett-hell);

    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.11em;
    text-transform: uppercase;
}

h1 {
    margin-bottom: 12px;

    color: var(--weiss);

    font-size: clamp(3.8rem, 5.5vw, 6.2rem);
    font-weight: 600;
    line-height: 0.92;
    letter-spacing: -0.045em;

    text-shadow:
        0 6px 24px rgba(0, 0, 0, 0.42),
        0 1px 2px rgba(255, 255, 255, 0.1);
}

h2 {
    margin-bottom: 27px;

    color: var(--violett-hell);

    font-size: clamp(1.65rem, 2.35vw, 2.65rem);
    font-weight: 400;
    line-height: 1.12;

    text-shadow: 0 5px 24px rgba(0, 0, 0, 0.38);
}

.themen {
    margin-bottom: 26px;

    color: var(--text-hell);

    font-size: clamp(1rem, 1.35vw, 1.22rem);
    font-weight: 600;
    line-height: 1.7;
}

.themen span {
    display: inline-block;

    margin: 0 10px;

    color: var(--violett-hell);
}

.beschreibung {
    max-width: 590px;
    margin-bottom: 34px;

    color: var(--text-hell);

    font-size: clamp(1rem, 1.2vw, 1.17rem);
    line-height: 1.65;
}

.aktionen {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;

    margin-bottom: 26px;
}

.button {
    min-width: 200px;
    min-height: 54px;

    display: inline-flex;
    align-items: center;
    justify-content: center;

    padding: 14px 26px;

    border-radius: 13px;

    color: var(--weiss);
    text-decoration: none;

    font-size: 1.04rem;
    font-weight: 700;

    transition:
        transform 180ms ease,
        border-color 180ms ease,
        background 180ms ease,
        box-shadow 180ms ease;
}

.button:hover {
    transform: translateY(-3px);
}

.button-primaer {
    background: linear-gradient(
        135deg,
        #7841e8,
        #a95fff
    );

    box-shadow:
        0 14px 35px rgba(123, 67, 233, 0.35),
        inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

.button-primaer:hover {
    box-shadow:
        0 18px 42px rgba(144, 74, 255, 0.44),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.button-sekundaer {
    background: rgba(8, 18, 55, 0.36);
    border: 1px solid rgba(255, 255, 255, 0.68);
}

.button-sekundaer:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--weiss);
}

.mailadresse {
    display: inline-flex;
    align-items: center;
    gap: 10px;

    color: var(--text-hell);
    text-decoration: none;

    font-size: 1.05rem;
}

.mailadresse:hover {
    color: var(--weiss);
}

.mail-symbol {
    width: 27px;
    height: 27px;

    display: inline-flex;
    align-items: center;
    justify-content: center;

    border: 1px solid rgba(255, 255, 255, 0.38);
    border-radius: 50%;

    color: var(--violett-hell);
    font-weight: 700;
}

.ttc-direktlink {
    position: fixed;
    top: 108px;
    right: 26px;
    z-index: 50;

    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;

    color: var(--text-hell);
    text-decoration: none;

    font-weight: 600;
}

.ttc-kreis {
    width: 68px;
    height: 68px;

    display: flex;
    align-items: center;
    justify-content: center;

    overflow: hidden;

    background: rgba(8, 16, 49, 0.62);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 50%;

    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.25);

    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);

    transition:
        transform 180ms ease,
        background 180ms ease;
}

.ttc-kreis img {
    width: 48px;
    height: 48px;

    object-fit: contain;
}

.ttc-direktlink:hover .ttc-kreis {
    transform: translateY(-3px) scale(1.04);
    background: rgba(104, 57, 187, 0.7);
}

.ttc-direktlink:hover {
    color: var(--weiss);
}

@media (max-width: 1150px) {

    .startseite {
        padding-right: 42px;
        padding-left: 42px;
    }

    .hero {
        grid-template-columns: minmax(300px, 0.8fr) minmax(440px, 1.2fr);
        gap: 45px;
    }

    .avatar-bereich {
        min-height: 520px;
    }

    .avatar {
        width: min(100%, 380px);
        max-height: 500px;
    }

    .ttc-direktlink {
        display: none;
    }

}

@media (max-width: 860px) {

    .kopfbereich {
        top: 12px;

        width: calc(100% - 24px);
        min-height: auto;

        flex-direction: column;
        gap: 13px;

        padding: 16px 18px;

        border-radius: 20px;
    }

    .navigation {
        width: 100%;

        justify-content: center;
        flex-wrap: wrap;

        gap: 19px;
    }

    .navigation a {
        padding: 3px 0 10px;

        font-size: 0.95rem;
    }

    .navigation a.aktiv::after {
        bottom: 2px;
    }

    .startseite {
        align-items: flex-start;

        padding:
            155px
            22px
            46px;
    }

    .hero {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .avatar-bereich {
        min-height: auto;
        height: 430px;
    }

    .avatar {
        width: min(92%, 360px);
        max-height: 430px;
    }

    .hero-inhalt {
        padding-top: 0;

        text-align: center;
    }

    .beschreibung {
        margin-right: auto;
        margin-left: auto;
    }

    .aktionen {
        justify-content: center;
    }

    .mailadresse {
        justify-content: center;
    }

    .planet-gross {
        top: 12%;
        right: -20%;

        width: 75vw;
    }

}

@media (max-width: 540px) {

    .logo {
        font-size: 1.18rem;
    }

    .navigation {
        gap: 14px;
    }

    .navigation a {
        font-size: 0.9rem;
    }

    .startseite {
        padding-right: 17px;
        padding-left: 17px;
    }

    .avatar-bereich {
        height: 360px;
    }

    .avatar {
        max-height: 360px;
    }

    h1 {
        font-size: clamp(3rem, 15vw, 4.2rem);
    }

    h2 {
        font-size: 1.65rem;
    }

    .themen span {
        margin: 0 5px;
    }

    .aktionen {
        flex-direction: column;
        align-items: stretch;
    }

    .button {
        width: 100%;
    }

}