*,
*::before,
*::after {
  box-sizing: border-box;
}

.fab-container {
    position: fixed;
    right: 20px;
    bottom: 20px;
    z-index: 999;
}

.fab {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: white;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0,0,0,0.25);
    cursor: pointer;
    transition: transform .25s;
}

.fab svg {
    width: 60%;
}

.fab-list {
    display: flex;
    flex-direction: column-reverse; /* кнопки идут вверх */
    align-items: center;
    margin-bottom: 10px;
}

.fab.item {
    opacity: 0;
    transform: translateY(20px) scale(.7);
    margin-bottom: 10px;
    transition: .3s ease;
    pointer-events: none;
}

/* Плавное появление по очереди */
.fab-list.show .item {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: all;
}

.delay1 { transition-delay: .05s; }
.delay2 { transition-delay: .10s; }
.delay3 { transition-delay: .15s; }
.delay4 { transition-delay: .20s; }
.delay5 { transition-delay: .25s; }

/******** АДАПТИВ ********/
@media (max-width: 600px) {
    .fab { width: 50px; height: 50px; }
    .fab svg { width: 55%; }
}