/* PV Calculator Button — pływający FAB */
.pvcalc-fab {
    position: fixed;
    bottom: 24px;
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: linear-gradient(135deg, #0F2A4A 0%, #1B3D6B 100%);
    box-shadow: 0 8px 24px rgba(15, 42, 74, 0.35), 0 0 0 0 rgba(34, 197, 94, 0.45);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    text-decoration: none;
    transition: transform 200ms ease, box-shadow 200ms ease;
    animation: pvcalc-pulse 4s ease-in-out infinite;
}

.pvcalc-fab--right { right: 24px; }
.pvcalc-fab--left  { left: 24px; }

.pvcalc-fab:hover,
.pvcalc-fab:focus-visible {
    transform: scale(1.08);
    box-shadow: 0 12px 32px rgba(15, 42, 74, 0.45), 0 0 0 6px rgba(34, 197, 94, 0.18);
    outline: none;
    animation-play-state: paused;
}

.pvcalc-fab__icon {
    width: 40px;
    height: 40px;
    display: block;
}
.pvcalc-fab__icon svg {
    width: 100%;
    height: 100%;
    display: block;
}

.pvcalc-fab__tooltip {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: #0F2A4A;
    color: #fff;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    font-size: 13px;
    font-weight: 600;
    line-height: 1;
    padding: 9px 12px;
    border-radius: 8px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 180ms ease, transform 180ms ease;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}
.pvcalc-fab--right .pvcalc-fab__tooltip {
    right: 76px;
    transform: translateY(-50%) translateX(6px);
}
.pvcalc-fab--left .pvcalc-fab__tooltip {
    left: 76px;
    transform: translateY(-50%) translateX(-6px);
}
.pvcalc-fab:hover .pvcalc-fab__tooltip,
.pvcalc-fab:focus-visible .pvcalc-fab__tooltip {
    opacity: 1;
    transform: translateY(-50%) translateX(0);
}

@keyframes pvcalc-pulse {
    0%, 100% {
        box-shadow: 0 8px 24px rgba(15, 42, 74, 0.35), 0 0 0 0 rgba(34, 197, 94, 0.45);
    }
    50% {
        box-shadow: 0 8px 24px rgba(15, 42, 74, 0.35), 0 0 0 12px rgba(34, 197, 94, 0);
    }
}

@media (max-width: 768px) {
    .pvcalc-fab {
        width: 56px;
        height: 56px;
        bottom: 16px;
    }
    .pvcalc-fab--right { right: 16px; }
    .pvcalc-fab--left  { left: 16px; }
    .pvcalc-fab__icon { width: 34px; height: 34px; }
    .pvcalc-fab__tooltip { display: none; }
    .pvcalc-fab--desktop-only { display: none; }
}

@media (prefers-reduced-motion: reduce) {
    .pvcalc-fab { animation: none; transition: none; }
    .pvcalc-fab:hover { transform: none; }
}