.runtime-guard-overlay {
  position: fixed;
  inset: 0;
  z-index: 20000;
  display: grid;
  place-items: center;
  padding: 24px;
  overflow-y: auto;
  background: var(--runtime-guard-backdrop);
  -webkit-backdrop-filter: blur(18px) saturate(.72);
  backdrop-filter: blur(18px) saturate(.72);
}

.runtime-guard-overlay[hidden] {
  display: none;
}

body.is-runtime-guard-blocked {
  overflow: hidden;
}

.runtime-guard-card {
  width: min(500px, 100%);
  padding: clamp(30px, 6vw, 48px);
  border: 1px solid var(--accent-border-strong);
  border-radius: var(--radius-card);
  background: var(--surface-glass-strong);
  color: var(--ink);
  text-align: center;
  box-shadow: 0 30px 90px rgba(42, 29, 17, .3);
  animation: runtime-guard-enter .18s ease-out;
}

.runtime-guard-mark {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  margin: 0 auto 22px;
  border: 1.5px solid var(--accent-border-strong);
  border-radius: var(--radius-control);
  background: var(--accent-surface);
  color: var(--accent);
  font-family: "Songti SC", "STSong", "Noto Serif CJK SC", serif;
  font-size: var(--fs-h3);
}

.runtime-guard-kicker {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: var(--fs-caption);
  font-weight: 750;
  letter-spacing: .2em;
}

.runtime-guard-card h2 {
  margin: 0;
  color: var(--ink);
  font-size: var(--fs-h2);
  line-height: 1.35;
}

.runtime-guard-message {
  margin: 18px 0 0;
  color: var(--text-secondary);
  font-size: var(--fs-body);
  line-height: 1.7;
}

.runtime-guard-safeguard {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--runtime-guard-copy-gap);
  align-items: start;
  margin-top: 22px;
  padding: 16px;
  border: 1px solid var(--color-success-border);
  border-radius: var(--radius-control);
  background: var(--success-surface);
  text-align: left;
}

.runtime-guard-safeguard-dot {
  width: 8px;
  height: 8px;
  margin-top: 7px;
  border-radius: var(--r-full);
  background: var(--color-success);
  box-shadow: 0 0 0 4px var(--success-overlay);
}

.runtime-guard-safeguard p {
  margin: 0;
  color: var(--color-success);
  font-size: var(--fs-caption);
  line-height: 1.65;
}

button.runtime-guard-action {
  width: 100%;
  min-height: 50px;
  margin-top: 24px;
  border-color: var(--accent-deep);
  border-radius: var(--radius-control);
  background: var(--accent-deep);
  color: var(--on-espresso);
  font-size: var(--fs-body);
  font-weight: 700;
}

button.runtime-guard-action:hover {
  border-color: var(--espresso-deep);
  background: var(--espresso-deep);
}

button.runtime-guard-action:focus-visible {
  outline: 3px solid var(--accent-border-strong);
  outline-offset: 3px;
}

button.runtime-guard-action:disabled {
  cursor: wait;
  opacity: .7;
}

.runtime-guard-footnote {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: var(--fs-caption);
  line-height: 1.55;
}

@keyframes runtime-guard-enter {
  from {
    opacity: 0;
    transform: translateY(8px) scale(.985);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@media (max-width: 560px) {
  .runtime-guard-overlay {
    padding: 16px;
  }

  .runtime-guard-card {
    padding: 28px 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .runtime-guard-card {
    animation: none;
  }
}