body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #fafafa;
    overflow: hidden;
}

.hidden { display: none !important; }

#auth-container { text-align: center; }
#btn-login {
    padding: 15px 30px;
    background-color: #4285F4;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
}

#main-interface {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    height: 90vh;
    width: 100%;
}

.header {
    font-size: 14px;
    color: #888;
    margin-top: 20px;
}

/* The Bottle Interaction Area */
.bottle-container {
    position: relative;
    width: 150px;
    height: 300px;
    cursor: pointer;
    /* Prevent blue highlight on tap on mobile */
    -webkit-tap-highlight-color: transparent; 
}

.bottle-svg {
    width: 100%;
    height: 100%;
    drop-shadow: 0px 10px 10px rgba(0,0,0,0.1);
}

/* Liquid Animation */
#liquid {
    transition: y 0.8s cubic-bezier(0.4, 0.0, 0.2, 1), height 0.8s cubic-bezier(0.4, 0.0, 0.2, 1);
}

/* The Badge (+1) */
.badge {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: #ff4081;
    color: white;
    font-weight: bold;
    font-size: 24px;
    padding: 10px 20px;
    border-radius: 50px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    z-index: 10;
    animation: popIn 0.2s ease-out;
}

@keyframes popIn {
    0% { transform: translate(-50%, -50%) scale(0); }
    80% { transform: translate(-50%, -50%) scale(1.1); }
    100% { transform: translate(-50%, -50%) scale(1); }
}

.footer {
    text-align: center;
    margin-bottom: 40px;
}

#status-message {
    font-size: 20px;
    font-weight: 500;
    margin-bottom: 5px;
}

.subtext { color: #666; }