.interactive-block.interactive-block--enhanced {
  --ih-ink: #17303a;
  --ih-muted: #61737a;
  --ih-line: #cbd7d9;
  position: relative;
  overflow: visible;
  padding: 0.7rem;
  border-color: var(--ih-line);
  border-radius: 12px;
  background: #eef3f3;
}

.interaction-toolbar {
  display: flex;
  gap: 0.8rem;
  align-items: center;
  justify-content: space-between;
  min-height: 2.75rem;
  margin: 0 0 0.55rem;
  padding: 0.45rem 0.55rem 0.45rem 0.7rem;
  color: var(--ih-ink);
  border: 1px solid var(--ih-line);
  border-radius: 8px;
  background: #f8fafa;
  font-family: "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
}

.interaction-toolbar__title {
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: 0.05rem;
}

.interaction-toolbar__title span {
  color: #277f92;
  font: 700 0.62rem/1.2 ui-monospace, "SFMono-Regular", Consolas, monospace;
  letter-spacing: 0.11em;
}

.interaction-toolbar__title strong {
  overflow: hidden;
  color: var(--ih-ink);
  font-size: 0.8rem;
  font-weight: 650;
  line-height: 1.35;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.interaction-toolbar__actions {
  display: flex;
  flex: 0 0 auto;
  gap: 0.4rem;
  align-items: center;
}

.interaction-toolbar__link,
.interaction-toolbar__fullscreen {
  display: inline-flex;
  min-height: 2rem;
  align-items: center;
  padding: 0.35rem 0.55rem;
  border: 1px solid #b8c8cb;
  border-radius: 6px;
  color: #245965;
  background: #fff;
  font: 650 0.7rem/1 "Microsoft YaHei", "Noto Sans SC", sans-serif;
  text-decoration: none;
  cursor: pointer;
}

.interaction-toolbar__link:hover,
.interaction-toolbar__fullscreen:hover { color: #123d46; border-color: #6e9da7; background: #edf7f8; }
.interaction-toolbar__link:focus-visible,
.interaction-toolbar__fullscreen:focus-visible { outline: 3px solid rgba(220, 146, 45, 0.35); outline-offset: 2px; }

.interactive-block--enhanced > iframe {
  width: 100%;
  max-width: none;
  min-height: 360px;
  border-radius: 8px;
}

.interactive-block--enhanced .interaction-learning-host:first-child { margin-bottom: 0.7rem; }
.interactive-block--enhanced iframe + .interaction-learning-host { margin-top: 0.7rem; }
.interactive-block--enhanced .interactive-caption { margin-inline: 0.2rem; }

@media (min-width: 1200px) {
  .interactive-block.interactive-block--wide {
    width: min(1080px, calc(100vw - 22rem));
    max-width: none;
    margin-left: 50%;
    transform: translateX(-50%);
  }
}

.interactive-block--enhanced:fullscreen {
  display: flex;
  width: 100vw;
  height: 100vh;
  max-width: none;
  margin: 0;
  padding: 0.5rem;
  transform: none;
  flex-direction: column;
  border: 0;
  border-radius: 0;
  background: #0d171b;
}

.interactive-block--enhanced:fullscreen .interaction-learning-host,
.interactive-block--enhanced:fullscreen .interactive-caption { display: none; }
.interactive-block--enhanced:fullscreen .interaction-toolbar { flex: 0 0 auto; }
.interactive-block--enhanced:fullscreen iframe { flex: 1 1 auto; min-height: 0; height: auto !important; border-radius: 5px; }

@media (max-width: 700px) {
  .interactive-block.interactive-block--enhanced {
    margin-inline: -0.75rem;
    padding: 0.42rem;
    border-radius: 8px;
  }
  .interaction-toolbar { align-items: flex-start; }
  .interaction-toolbar__title strong { max-width: 48vw; }
  .interaction-toolbar__link,
  .interaction-toolbar__fullscreen { min-height: 44px; padding-inline: 0.55rem; }
  .interactive-block--enhanced > iframe { border-radius: 6px; }
}

@media (prefers-reduced-motion: reduce) {
  .interactive-block--enhanced * { scroll-behavior: auto !important; transition: none !important; }
}