.cart-addon-overlay {
    position: fixed;
    inset: 0;
    z-index: 1080;
    background: rgba(15, 23, 42, 0.55);
    display: none;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}
.cart-addon-overlay.show {
    display: flex;
}
.cart-addon-modal {
    width: min(640px, 100%);
    max-height: 90vh;
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.2);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
.cart-addon-modal__head {
    padding: 1.1rem 1.25rem;
    background: linear-gradient(135deg, #4f46e5 0%, #6366f1 100%);
    color: #fff;
}
.cart-addon-modal__body {
    padding: 1rem 1.25rem;
    overflow-y: auto;
    flex: 1;
}
.cart-addon-modal__foot {
    padding: 0.9rem 1.25rem;
    border-top: 1px solid #e2e8f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
    background: #f8fafc;
    flex-wrap: wrap;
}
.cart-addon-group {
    margin-bottom: 1rem;
}
.cart-addon-group__title {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: #64748b;
    margin-bottom: 0.5rem;
}
.cart-addon-option {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.75rem 0.85rem;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
}
.cart-addon-option:hover {
    border-color: #a5b4fc;
    background: #f8fafc;
}
.cart-addon-option.selected {
    border-color: #6366f1;
    background: #eef2ff;
}
.cart-addon-option input {
    margin-top: 0.2rem;
    flex-shrink: 0;
}
.cart-addon-option__meta {
    flex: 1;
    min-width: 0;
}
.cart-addon-option__name {
    font-weight: 600;
    color: #0f172a;
    font-size: 0.9rem;
}
.cart-addon-option__desc {
    font-size: 0.78rem;
    color: #64748b;
    margin-top: 0.15rem;
}
.cart-addon-option__price {
    font-weight: 700;
    color: #059669;
    white-space: nowrap;
    font-size: 0.9rem;
}
.cart-addon-total {
    font-size: 1rem;
    font-weight: 700;
    color: #4f46e5;
}
.cart-addon-modal .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.35rem 0.85rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 0.5rem;
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    line-height: 1.4;
}
.cart-addon-modal .btn-primary {
    background: #4f46e5;
    color: #fff;
    border-color: #4f46e5;
}
.cart-addon-modal .btn-primary:hover {
    background: #4338ca;
}
.cart-addon-modal .btn-light {
    background: #f1f5f9;
    color: #334155;
    border-color: #e2e8f0;
}
.cart-addon-modal .btn-light:hover {
    background: #e2e8f0;
}
.cart-addon-modal .btn-link {
    background: transparent;
    border: none;
    color: #64748b;
}
.cart-addon-modal .btn-link:hover {
    color: #334155;
    text-decoration: underline;
}
.cart-addon-modal .badge {
    display: inline-block;
    padding: 0.15rem 0.45rem;
    font-size: 0.7rem;
    font-weight: 600;
    border-radius: 0.35rem;
}
.cart-addon-modal .bg-warning { background: #fde68a; }
.cart-addon-modal .text-dark { color: #1e293b; }
.cart-addon-modal .bg-light { background: #f8fafc; }
.cart-addon-modal .text-muted { color: #64748b; }
.cart-addon-modal .border { border: 1px solid #e2e8f0; }
.cart-addon-modal .ms-1 { margin-left: 0.25rem; }
.cart-addon-modal .me-1 { margin-right: 0.25rem; }
.cart-addon-modal .small { font-size: 0.875rem; }
.cart-addon-modal .fw-bold { font-weight: 700; }
.cart-addon-modal .opacity-75 { opacity: 0.85; }
.cart-addon-modal .d-flex { display: flex; }
.cart-addon-modal .gap-2 { gap: 0.5rem; }
.cart-addon-modal .flex-wrap { flex-wrap: wrap; }
.cart-addon-modal .form-select {
    width: 100%;
    padding: 0.45rem 0.65rem;
    border: 1px solid #e2e8f0;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    background: #fff;
}