.plz-karte {
    max-width: 1100px;
    margin: 0 auto;
    padding: 32px 16px 48px;
}

.plz-karte__back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: color .2s ease, background .2s ease, border-color .2s ease, transform .2s ease;
}

.plz-karte__back-arrow {
    display: inline-block;
    transition: transform .2s ease;
}

.plz-karte__back:hover .plz-karte__back-arrow {
    transform: translateX(-4px);
}

.plz-karte__back--top {
    font-size: 14px;
    color: #475569;
    padding: 6px 12px;
    border-radius: 999px;
    border: 1px solid rgba(15, 23, 42, 0.12);
    background: #fff;
}

.plz-karte__back--top:hover {
    color: #00c800;
    border-color: rgba(0, 200, 0, 0.45);
}

.plz-karte__back-wrap {
    display: flex;
    justify-content: center;
    margin-top: 36px;
}

.plz-karte__back--bottom {
    font-size: 16px;
    color: #00c800;
    padding: 12px 22px;
    border-radius: 12px;
    border: 2px solid #00c800;
    background: #fff;
    letter-spacing: 0.02em;
}

.plz-karte__back--bottom:hover {
    background: #00c800;
    color: #fff;
}

@media (prefers-reduced-motion: reduce) {
    .plz-karte__back,
    .plz-karte__back-arrow {
        transition: none;
    }
    .plz-karte__back:hover .plz-karte__back-arrow {
        transform: none;
    }
}

.plz-karte__heading {
    font-family: 'Titillium Web', sans-serif;
    font-size: clamp(22px, 3vw, 34px);
    font-weight: 700;
    color: #0f172a;
    margin: 0 0 8px;
    text-align: center;
}

.plz-karte__sub {
    text-align: center;
    color: #475569;
    font-size: 16px;
    margin: 0 0 24px;
}

.plz-karte__stage {
    position: relative;
    margin: 0 auto;
    max-width: 880px;
    line-height: 0;
}

.plz-karte__base {
    width: 100%;
    height: auto;
    display: block;
}

.plz-karte__overlay {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: visible;
}

.hotspot .dot {
    fill: currentColor;
    filter: drop-shadow(0 0 3px rgba(0, 0, 0, 0.35));
}

.hotspot .ring {
    fill: none;
    stroke: currentColor;
    stroke-width: 2.5;
    animation: plz-pulse var(--period, 2.4s) cubic-bezier(0.25, 0.6, 0.3, 1) infinite;
}

.hotspot .r2 {
    animation-delay: calc(var(--period, 2.4s) * -0.66);
}

.hotspot .r3 {
    animation-delay: calc(var(--period, 2.4s) * -0.33);
}

@keyframes plz-pulse {
    0% {
        r: 6;
        opacity: 0.95;
        stroke-width: 3;
    }
    100% {
        r: 70;
        opacity: 0;
        stroke-width: 0.4;
    }
}

/* 5 Aktivitaetsstufen: gelb (gering) -> rot (hoechste). Puls deutlich gestaffelt:
   hoechste Aktivitaet schnell, geringste ganz langsam. */
.tier-1 {
    color: #f4cf4a;
    --period: 4.4s;
}

.tier-2 {
    color: #f6a623;
    --period: 3.4s;
}

.tier-3 {
    color: #f97316;
    --period: 2.5s;
}

.tier-4 {
    color: #f4501e;
    --period: 1.7s;
}

.tier-5 {
    color: #e0162b;
    --period: 1.1s;
}

/* Obere Stufen kraeftiger hervorheben. */
.tier-4 .ring {
    stroke-width: 3.2;
}

.tier-4 .dot {
    r: 6.8;
}

.tier-5 .ring {
    stroke-width: 3.8;
}

.tier-5 .dot {
    r: 7.6;
}

.plz-karte__legende {
    list-style: none;
    padding: 0;
    margin: 28px 0 0;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 18px 28px;
    font-size: 15px;
    color: #1e293b;
}

.plz-karte__legende li {
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.plz-karte__legende li::before {
    content: "";
    display: inline-block;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: currentColor;
    box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.9), 0 0 0 6px currentColor;
}

@media (prefers-reduced-motion: reduce) {
    .hotspot .ring {
        animation: none;
        opacity: 0;
    }
}