.u-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, .28);
    display: grid;
    place-items: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity .15s ease-out, visibility .15s ease-out;
}

.u-backdrop.is-open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.u-modal {
    width: min(520px, 92vw);
    background: #fff;
    color: #222;
    border: 1px solid rgba(0, 0, 0, .08);
    border-radius: 36px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, .18);
    transform: translateY(6px) scale(.98);
    opacity: .98;
    transition: transform .15s ease-out, opacity .15s ease-out;
}

.u-modal.is-open {
    transform: none;
    opacity: 1;
}

.u-modal header {
    padding: 26px 30px 6px;
    font-size: 22px;
    font-weight: 600;
}

.u-modal main {
    padding: 19px 30px 28px;
    color: #333;
    font-size: 17px;
}

.u-modal footer {
    padding: 12px 20px 16px;
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    border-top: 1px solid rgba(0, 0, 0, .06);
    border-bottom-left-radius: 36px;
    border-bottom-right-radius: 36px;
    background: #fafafa;
}

.u-btn {
    appearance: none;
    border: 1px solid rgba(0, 0, 0, .15);
    background: #fff;
    color: #333;
    padding: 8px 16px;
    border-radius: 18px;
    cursor: pointer;
}

.u-btn:hover {
    background: #f5f5f5;
}

.u-btn:focus {
    outline: 2px solid #2b6cb0;
    outline-offset: 2px;
}

.u-btn.primary {
    background: #4636ff;
    color: #fff;
    border: #4636ff 1px solid;
}

.u-btn.primary:hover {
    background: #fff;
    color: #333;
}