/* ==========================================
   Shared Baby App base styles (common.css)
   ========================================== */

* {
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html, body {
    margin: 0;
    padding: 0;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    user-select: none;
    -webkit-user-select: none;
    touch-action: none;
    overscroll-behavior: none;
    position: fixed;
}

/* Floating button to return to the Home Hub */
.home-nav-btn {
    position: fixed;
    top: 16px;
    left: 16px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.85);
    border: 1px solid rgba(0, 0, 0, 0.1);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-size: 1.3rem;
    z-index: 100;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    transition: transform 0.2s ease, background-color 0.2s ease;
}

.home-nav-btn:active {
    transform: scale(0.9);
    background: #FFFFFF;
}

/* Shared particle animation */
.particle {
    position: absolute;
    pointer-events: none;
    border-radius: 50%;
    z-index: 8;
    animation: fadeOut 0.8s ease-out forwards;
}

@keyframes fadeOut {
    0% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }
    100% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.2);
    }
}