.refer-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #f59e0b;
  border: none;
  color: #1e1a00;
  padding: 7px 14px;
  border-radius: 9px;
  font-size: 0.78rem;
  font-weight: 800;
  cursor: pointer;
  transition: transform .15s, box-shadow .15s, background .15s;
  box-shadow: 0 2px 8px rgba(245,158,11,0.4);
  letter-spacing: 0.01em;
  margin-bottom: 0;
  white-space: nowrap;
  text-decoration: none;
}
.refer-btn:hover {
  background: #fbbf24;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(245,158,11,0.55);
}
.refer-btn:active {
  transform: translateY(0);
  box-shadow: 0 1px 4px rgba(245,158,11,0.4);
}
.invoice-referral-dialog {
  width: min(420px, calc(100% - 32px));
  max-height: calc(100dvh - 32px);
  margin: auto;
  overflow-y: auto;
  border: 1px solid #fde68a;
  border-radius: 16px;
  padding: 24px;
  color: #1e293b;
  background: #fff;
  box-shadow: 0 16px 60px #0004;
  text-align: left;
}
.invoice-referral-dialog::backdrop { background: #0008; }
.invoice-referral-dialog h2 { margin: 0 28px 10px 0; font-size: 22px; }
.invoice-referral-dialog p { margin: 10px 0 18px; font-size: 14px; line-height: 1.5; }
.invoice-referral-dialog label { display: block; margin: 16px 0 6px; font-size: 14px; font-weight: 700; }
.invoice-referral-dialog input {
  width: 100%; padding: 12px; border: 1px solid #cbd5e1;
  border-radius: 9px; font: inherit; font-size: 16px; color: #1e293b; background: #fff;
}
.invoice-referral-dialog [type="submit"] { width: 100%; justify-content: center; margin-top: 22px; padding: 12px; }
.invoice-referral-dialog button:disabled { opacity: .65; cursor: default; }
.invoice-referral-close { float: right; background: #f1f5f9; border: none; border-radius: 50%; padding: 4px 10px; font-size: 22px; cursor: pointer; }
.invoice-referral-dialog .invoice-referral-status { margin-bottom: 0; }
.invoice-referral-dialog .invoice-referral-status[data-state="success"],
.invoice-referral-confirmation {
  background: #ecfdf5;
  color: #166534;
  border: 1px solid #86efac;
  border-radius: 9px;
  padding: 12px;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.5;
}
.invoice-referral-confirmation { margin: 14px 0 0; }