.mobile-whatsapp { display: none; }
@media (max-width: 760px) {
    body { padding-bottom: calc(88px + env(safe-area-inset-bottom, 0px)); }
    .mobile-whatsapp { position: fixed; z-index: 40; left: 16px; right: 16px; bottom: calc(12px + env(safe-area-inset-bottom, 0px)); display: flex; align-items: center; justify-content: center; gap: 12px; min-height: 54px; padding: 12px 18px; background: #123a2d; color: #e8fff3; border: 1px solid #67dfaa; border-radius: 8px; font: 700 1.15rem 'Rajdhani', sans-serif; text-decoration: none; box-shadow: 0 6px 24px #08081080; }
    .mobile-whatsapp svg { width: 26px; height: 26px; flex-shrink: 0; }
    .mobile-whatsapp:hover { background: #1b503d; }
    .mobile-whatsapp:focus-visible { outline: 2px solid #e8fff3; outline-offset: 3px; }
    .parts-chat { bottom: calc(82px + env(safe-area-inset-bottom, 0px)); right: 16px; }
    .parts-chat .chat-panel { height: min(500px, calc(100dvh - 190px)); }
}