.flash-stack {
    position: fixed;
    z-index: 10000;
    top: 112px;
    right: clamp(16px, 3vw, 40px);
    display: grid;
    width: min(420px, calc(100vw - 32px));
    gap: 12px;
}

.flash {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    padding: 16px 18px;
    border: 1px solid transparent;
    border-radius: 14px;
    box-shadow: 0 14px 38px rgb(0 29 80 / 18%);
    background: #ffffff;
    color: #17233c;
    font: 600 14px/1.45 "Poppins", sans-serif;
}

.flash--success { border-color: #1b8f5a; }
.flash--error { border-color: #c43b4d; }
.flash--warning { border-color: #d28b13; }
.flash--info { border-color: #2465c4; }

.flash__close {
    flex: 0 0 auto;
    border: 0;
    background: transparent;
    color: inherit;
    font: 700 22px/1 sans-serif;
    cursor: pointer;
}

.flash.is-leaving {
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity .2s ease, transform .2s ease;
}

@media (max-width: 640px) {
    .flash-stack { top: 88px; }
}