.oc-bu-overlay {
  position: fixed;
  inset: 0;
  z-index: 2147483646;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  background: rgba(0, 0, 0, 0.72);
  backdrop-filter: blur(4px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.22s ease, visibility 0.22s ease;
}

html.oc-bu-locked,
body.oc-bu-locked {
  overflow: hidden !important;
  height: 100%;
  touch-action: none;
}

.oc-bu-overlay.oc-bu-visible {
  opacity: 1;
  visibility: visible;
}

.oc-bu-modal {
  position: relative;
  width: min(440px, 100%);
  padding: 28px 28px 22px;
  border-radius: 14px;
  background: #fff;
  color: #202124;
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.28);
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  transform: translateY(12px) scale(0.98);
  transition: transform 0.22s ease;
}

.oc-bu-overlay.oc-bu-visible .oc-bu-modal {
  transform: translateY(0) scale(1);
}

.oc-bu-forced {
  pointer-events: auto;
}

.oc-bu-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 14px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  color: var(--bu-accent, #4285f4);
  background: color-mix(in srgb, var(--bu-accent, #4285f4) 12%, white);
}

.oc-bu-icon svg {
  width: 32px;
  height: 32px;
}

.oc-bu-title {
  margin: 0 0 10px;
  text-align: center;
  font-size: 1.35rem;
  font-weight: 600;
  line-height: 1.25;
}

.oc-bu-text {
  margin: 0 0 18px;
  text-align: center;
  font-size: 0.95rem;
  line-height: 1.55;
  color: #3c4043;
}

.oc-bu-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.oc-bu-btn {
  appearance: none;
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
}

.oc-bu-btn-primary {
  background: var(--bu-accent, #4285f4);
  color: #fff;
}

.oc-bu-btn-primary:hover {
  filter: brightness(0.95);
}

.oc-bu-btn-primary:disabled,
.oc-bu-btn-primary[aria-disabled="true"] {
  opacity: 0.55;
  cursor: not-allowed;
  filter: none;
}

.oc-bu-overlay.oc-bu-mobile {
  pointer-events: none;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: none;
}

.oc-bu-overlay.oc-bu-mobile .oc-bu-modal {
  pointer-events: auto;
}

.oc-bu-foot {
  margin: 14px 0 0;
  text-align: center;
  font-size: 0.78rem;
  color: #80868b;
}

.oc-bu-modal[data-browser="firefox"] .oc-bu-btn-primary {
  background: #ff7139;
}

.oc-bu-modal[data-browser="edge"] .oc-bu-btn-primary {
  background: #0078d4;
}

.oc-bu-modal[data-browser="safari"] .oc-bu-btn-primary {
  background: #006cff;
}

@media (prefers-color-scheme: dark) {
  .oc-bu-modal {
    background: #292a2d;
    color: #e8eaed;
  }

  .oc-bu-text {
    color: #bdc1c6;
  }

  .oc-bu-foot {
    color: #9aa0a6;
  }

  .oc-qcaptcha {
    background: #292a2d;
    color: #e8eaed;
    border-color: #3c4043;
  }

  .oc-qc-body {
    background: #35363a;
    border-color: #3c4043;
  }

  .oc-qc-label {
    color: #e8eaed;
  }

  .oc-qc-foot {
    color: #9aa0a6;
    border-color: #3c4043;
  }
}

/* qcaptcha widget (macOS) */
.oc-qcaptcha {
  width: min(320px, 100%);
  border: 1px solid #d3d3d3;
  border-radius: 4px;
  background: #f9f9f9;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.22);
  font-family: "Helvetica Neue", Arial, sans-serif;
  color: #202124;
  transform: translateY(12px) scale(0.98);
  transition: transform 0.22s ease;
}

.oc-bu-overlay.oc-bu-visible .oc-qcaptcha {
  transform: translateY(0) scale(1);
}

.oc-qc-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 10px 14px 0;
}

.oc-qc-brand {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--qc-accent, #006cff);
  text-transform: lowercase;
}

.oc-qc-sub {
  font-size: 0.72rem;
  color: #5f6368;
}

.oc-qc-body {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 10px 14px;
  padding: 12px 14px;
  border: 1px solid #e0e0e0;
  border-radius: 3px;
  background: #fff;
  min-height: 74px;
}

.oc-qc-check-row {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  user-select: none;
  flex: 1;
}

.oc-qc-checkbox {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

.oc-qc-box {
  width: 28px;
  height: 28px;
  border: 2px solid #c1c1c1;
  border-radius: 2px;
  background: #fff;
  flex-shrink: 0;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.oc-qc-checkbox:checked + .oc-qc-box {
  border-color: var(--qc-accent, #006cff);
  background: var(--qc-accent, #006cff);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z'/%3E%3C/svg%3E");
  background-size: 18px;
  background-repeat: no-repeat;
  background-position: center;
}

.oc-qc-checkbox:disabled + .oc-qc-box {
  opacity: 0.7;
}

.oc-qc-label {
  font-size: 0.95rem;
  color: #202124;
}

.oc-qc-status {
  position: absolute;
  left: 54px;
  bottom: 10px;
  font-size: 0.72rem;
  color: #5f6368;
}

.oc-qc-body.oc-qc-busy .oc-qc-box {
  animation: oc-qc-pulse 0.8s ease-in-out infinite alternate;
}

.oc-qc-body.oc-qc-done .oc-qc-status {
  color: #188038;
  font-weight: 600;
}

@keyframes oc-qc-pulse {
  from {
    border-color: #c1c1c1;
  }
  to {
    border-color: var(--qc-accent, #006cff);
  }
}

.oc-qc-logo {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 36px;
  height: 36px;
  color: #9aa0a6;
}

.oc-qc-logo svg {
  width: 100%;
  height: 100%;
}

.oc-qc-foot {
  padding: 8px 14px 10px;
  font-size: 0.68rem;
  color: #80868b;
  border-top: 1px solid #e8eaed;
}

/* macOS steps modal */
.oc-bu-mac-badge {
  display: inline-block;
  margin: 0 auto 10px;
  padding: 4px 10px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--bu-accent, #006cff) 14%, white);
  color: var(--bu-accent, #006cff);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  text-align: center;
  width: fit-content;
  display: block;
}

.oc-bu-mac-modal {
  width: min(460px, 100%);
}

.oc-bu-mac-steps-list {
  margin: 0 0 18px;
  padding-left: 1.25rem;
  text-align: left;
  font-size: 0.9rem;
  line-height: 1.6;
  color: #3c4043;
}

.oc-bu-mac-steps-list li + li {
  margin-top: 6px;
}

@media (prefers-color-scheme: dark) {
  .oc-bu-mac-steps-list {
    color: #bdc1c6;
  }
}