:root {
    --akzent: #4A90C4;
    --akzent-d: #2E6A9A;
    --dunkel: #060A10;
    --karte: rgba(10, 25, 50, 0.50);
    --linie: rgba(74, 144, 196, 0.30);
    --text: #D8DFE8;
    --text-d: #7A8A9A;
    --speed: 0.25s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background: transparent;
    color: var(--text);
    font-family: 'Lato', sans-serif;
    font-weight: 300;
    line-height: 1.75;
    font-size: 1rem;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
}

/* ── Hintergrund ── */
.bg-wald {
    position: fixed;
    inset: 0;
    background-image: url('assets/viv-baumkrone.jpg');
    background-size: cover;
    background-position: center top;
    background-repeat: no-repeat;
    z-index: -2;
    will-change: transform; /* kein filter hier – GPU-Layer bleibt stabil */
}

.bg-nebel {
    position: fixed;
    inset: 0;
    /* Verdunkelung hier statt filter auf bg-wald – gleicher Ansatz wie MVD */
    background: linear-gradient(180deg,
            rgba(4, 10, 20, 0.5) 0%,
            rgba(4, 10, 20, 0.65) 50%,
            rgba(4, 10, 20, 0.82) 100%);
    z-index: -1;
    will-change: transform;
}

/* ── Layout ── */
.seite {
    max-width: 860px;
    margin: 0 auto;
    padding: 5rem 1.5rem 3rem;
}

/* ── Header ── */
.kopf {
    text-align: center;
    padding-bottom: 2.5rem;
    border-bottom: 1px solid var(--linie);
    margin-bottom: 3rem;
}

.logo-viv {
    max-width: 100%;
    width: 100%;
    margin: 0 auto 1.5rem;
    display: block;
    filter: drop-shadow(0 2px 12px rgba(0, 0, 0, 0.7));
}

/* ── Überschriften ── */
h1 {
    font-family: 'Playfair Display', serif;
    font-size: 2.6rem;
    font-weight: 900;
    color: #ffffff;
    letter-spacing: 1px;
    line-height: 1.15;
    margin-bottom: 1.5rem;
    text-align: center;
}

h2 {
    font-family: 'Playfair Display', serif;
    font-size: 1.35rem;
    font-weight: 700;
    color: #846C5B;
    letter-spacing: 0.5px;
    margin: 0 0 1rem;
    padding-bottom: 0.4rem;
    border-bottom: 1px solid var(--linie);
    text-transform: uppercase;
}

h3 {
    font-family: 'Lato', sans-serif;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text);
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

/* ── Karten / Sektionen ── */
.karte {
    background: var(--karte);
    border: 1px solid #846C5B;
    border-radius: 10px;
    padding: 2rem 2.5rem;
    margin-bottom: 1.5rem;
    position: relative;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

@media (max-width: 640px) {
    .karte {
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
        background: rgba(10, 25, 50, 0.85);
    }
}

.karte::before {
    display: none;
}

.karte-plain::before {
    display: none;
}

/* ── Absatz ── */
p {
    color: white(--text);
    line-height: 1.8;
    font-size: 1.1rem;
    font-weight: 600;
}

p+p {
    margin-top: 0.9rem;
}

strong {
    color: var(--text);
    font-weight: 700;
}

a {
    color: var(--akzent);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color var(--speed);
}

a:hover {
    border-bottom-color: var(--akzent);
}

/* ── Bild-Elemente ── */
.bild-vollbreite {
    display: block;
    width: 100%;
    margin-top: 1.5rem;
    border: 1px solid var(--linie);
    filter: brightness(0.9) saturate(0.85);
}

.bild-center {
    display: block;
    max-width: 180px;
    margin: 1.5rem auto 0;
}

/* ── Video ── */
.video-wrap {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    margin-top: 1.5rem;
    border: 1px solid var(--linie);
}

.video-wrap iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* ── Buttons ── */
.btn {
    display: inline-block;
    padding: 0.75rem 1.75rem;
    border: 1px solid var(--akzent);
    border-bottom: 1px solid var(--akzent) !important;
    color: var(--text);
    background: transparent;
    font-family: 'Lato', sans-serif;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    text-decoration: none;
    cursor: pointer;
    transition: background var(--speed), color var(--speed);
}

.btn:hover {
    background: var(--akzent);
    color: #fff;
    border-bottom-color: var(--akzent) !important;
}

.btn-block {
    display: block;
    width: 100%;
    text-align: center;
    margin-top: 0.75rem;
    padding: 1rem;
}

.btn-hell {
    border-color: rgba(74, 144, 196, 0.5) !important;
    color: var(--text-d);
}

.btn-hell:hover {
    background: rgba(74, 144, 196, 0.15);
    color: var(--text);
    border-color: var(--akzent) !important;
}

.knopf-reihe {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

/* ── Tipp-Box ── */
.tipp-box {
    border-left: 3px solid var(--akzent);
    padding: 0.75rem 1rem;
    background: rgba(74, 144, 196, 0.07);
    margin-top: 1rem;
    font-size: 0.9rem;
}

/* ── Akkordeon ── */
.akkordeon-gruppe {
    margin-top: 0.5rem;
}

.akkordeon {
    border-bottom: none;
}

.akkordeon-kopf {
    width: 100%;
    background: transparent;
    border: none;
    padding: 0.9rem 0.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    gap: 1rem;
    transition: background var(--speed);
    text-align: left;
}

.akkordeon-kopf:hover {
    background: rgba(74, 144, 196, 0.07);
}

.akkordeon-kopf h3 {
    margin: 0;
    font-size: 1.1rem;
    color: #ffffff;
    font-weight: 700;
}

.akkordeon-pfeil {
    font-size: 1.3rem;
    color: var(--akzent);
    line-height: 1;
    flex-shrink: 0;
    transition: transform var(--speed);
    font-style: normal;
}

.akkordeon-kopf.offen .akkordeon-pfeil {
    transform: rotate(45deg);
}

.akkordeon-inhalt {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-out;
}

.akkordeon-inhalt-inner {
    padding: 1rem 1rem 1.25rem;
    background: rgba(4, 15, 35, 0.5);
    border-left: 2px solid rgba(74, 144, 196, 0.3);
    margin-left: 0.5rem;
}

.akkordeon-inhalt-inner p {
    font-size: 1.1rem;
    color: #ffffff;
    font-weight: 600;
    line-height: 1.7;
}

.akkordeon-inhalt-inner img {
    max-width: 100%;
    margin-top: 0.75rem;
    border: 1px solid var(--linie);
    filter: brightness(0.92);
}

/* ── Formular ── */
.formular {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 1.25rem;
}

.formular input,
.formular textarea {
    background: rgba(4, 15, 35, 0.55);
    border: 1px solid var(--linie);
    color: var(--text);
    font-family: 'Lato', sans-serif;
    font-size: 0.9rem;
    padding: 0.75rem 1rem;
    width: 100%;
    outline: none;
    transition: border-color var(--speed);
}

.formular input:focus,
.formular textarea:focus {
    border-color: var(--akzent);
}

.formular textarea {
    resize: vertical;
}

/* ── Footer ── */
.fuss {
    text-align: center;
    padding: 2.5rem 0 1.5rem;
    color: var(--text-d);
    font-size: 0.8rem;
    letter-spacing: 1px;
    border-top: 1px solid var(--linie);
    margin-top: 2rem;
}

/* ── Scroll Reveal ── */
.scroll-reveal {
    opacity: 0;
    transform: translateY(8px); /* Weniger Bewegung = weniger GPU-Arbeit */
    transition: opacity 0.3s ease-out, transform 0.3s ease-out; /* Kürzer = weniger Überlappung */
    will-change: opacity, transform; /* GPU-Layer vorab vorbereiten */
}

.scroll-reveal.visible {
    opacity: 1;
    transform: translateY(0);
    will-change: auto; /* GPU-Layer wieder freigeben */
}

/* ── Hilfs-Klassen ── */
.mitte {
    text-align: center;
}

.mt {
    margin-top: 1.25rem;
}

.mt2 {
    margin-top: 2rem;
}

/* ── Responsive ── */
@media (max-width: 640px) {
    .seite {
        padding: 3rem 1rem 2rem;
    }

    h1 {
        font-size: 1.9rem;
    }

    .karte {
        padding: 1.5rem 1.25rem;
    }

    .logo-viv {
        max-width: 100%;
    }
}