.article-content img[data-media-viewer-target],
.article-content .mermaid[data-media-viewer-target] {
  cursor: zoom-in;
}

.article-content img[data-media-viewer-target] {
  transition: border-color .16s ease, box-shadow .16s ease;
}

.article-content img[data-media-viewer-target]:hover {
  border-color: var(--lab-accent);
  box-shadow: 0 0 0 3px var(--lab-accent-soft);
}

.article-content .mermaid[data-media-viewer-target] {
  position: relative;
  transition: border-color .16s ease;
}

.article-content .mermaid[data-media-viewer-target]:hover {
  border-color: var(--lab-accent);
}

body.media-viewer-open {
  overflow: hidden;
}

.media-viewer {
  --viewer-bg: var(--lab-surface);
  --viewer-ink: var(--lab-ink);
  --viewer-muted: var(--lab-muted);
  --viewer-line: var(--lab-line-strong);
  --viewer-accent: var(--lab-accent);
  --viewer-shadow: rgba(15, 24, 29, .1);
  width: 100vw;
  max-width: none;
  height: 100vh;
  height: 100dvh;
  max-height: none;
  padding: 0;
  color: var(--viewer-ink);
  border: 0;
  background: var(--viewer-bg);
  overflow: hidden;
}

.media-viewer[open] {
  display: block;
}

.media-viewer::backdrop {
  background: rgba(23, 32, 39, .22);
  backdrop-filter: blur(10px);
}

:root[data-theme="dark"] .media-viewer {
  --viewer-bg: #080d10;
  --viewer-ink: #dce4e7;
  --viewer-muted: #89979d;
  --viewer-line: #344148;
  --viewer-accent: #78a9b8;
  --viewer-shadow: rgba(0, 0, 0, .38);
}

:root[data-theme="dark"] .media-viewer::backdrop {
  background: rgba(4, 7, 9, .82);
}

.media-viewer__surface {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: 48px minmax(0, 1fr) 46px;
  width: 100%;
  height: 100%;
  padding: 14px 18px 16px;
}

.media-viewer__header,
.media-viewer__footer {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-width: 0;
  font-family: var(--lab-font-mono);
}

.media-viewer__header {
  padding-bottom: 13px;
  border-bottom: 1px solid var(--viewer-line);
}

.media-viewer__identity,
.media-viewer__caption,
.media-viewer__hint {
  margin: 0;
}

.media-viewer__identity {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--viewer-accent);
  font-size: 10px;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.media-viewer__identity span:last-child {
  color: var(--viewer-muted);
}

.media-viewer__controls {
  display: flex;
  flex: none;
  align-items: center;
  gap: 5px;
}

.media-viewer__controls button {
  display: grid;
  place-items: center;
  min-width: 32px;
  height: 30px;
  padding: 0 9px;
  color: var(--viewer-ink);
  font: 11px var(--lab-font-mono);
  border: 1px solid var(--viewer-line);
  border-radius: 2px;
  background: transparent;
  cursor: pointer;
}

.media-viewer__controls button:hover {
  color: var(--viewer-ink);
  border-color: var(--viewer-accent);
  background: color-mix(in srgb, var(--viewer-accent) 10%, transparent);
}

.media-viewer__controls .media-viewer__scale {
  min-width: 58px;
  color: var(--viewer-accent);
  font-size: 9px;
}

.media-viewer__controls .media-viewer__close {
  margin-left: 7px;
  color: var(--viewer-muted);
  font-size: 9px;
}

.media-viewer__stage {
  position: relative;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  outline: 0;
  cursor: grab;
  touch-action: none;
  user-select: none;
}

.media-viewer__stage:focus-visible {
  outline: 1px solid color-mix(in srgb, var(--viewer-accent) 34%, transparent);
  outline-offset: -1px;
}

.media-viewer__stage::before,
.media-viewer__stage::after {
  content: "";
  position: absolute;
  z-index: 0;
  pointer-events: none;
  background: transparent;
}

:root[data-theme="dark"] .media-viewer__stage::before,
:root[data-theme="dark"] .media-viewer__stage::after {
  background: color-mix(in srgb, var(--viewer-accent) 11%, transparent);
}

.media-viewer__stage::before {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
}

.media-viewer__stage::after {
  top: 50%;
  right: 0;
  left: 0;
  height: 1px;
}

.media-viewer__stage.is-dragging {
  cursor: grabbing;
}

.media-viewer__canvas {
  position: absolute;
  z-index: 1;
  top: 50%;
  left: 50%;
  display: grid;
  place-items: center;
  margin: 0;
  transform-origin: center;
  will-change: transform;
}

.media-viewer__canvas img,
.media-viewer__canvas svg {
  display: block;
  width: 100%;
  max-width: none;
  height: 100%;
  max-height: none;
  margin: 0;
  border: 0;
  object-fit: contain;
  pointer-events: none;
  user-select: none;
}

.media-viewer[data-media-kind="diagram"] .media-viewer__canvas {
  background: var(--lab-bg);
  box-shadow: 0 18px 70px var(--viewer-shadow), 0 0 0 1px var(--viewer-line);
}

.media-viewer[data-media-kind="image"] .media-viewer__canvas img {
  box-shadow: 0 18px 70px var(--viewer-shadow), 0 0 0 1px var(--viewer-line);
}

.media-viewer__footer {
  padding-top: 13px;
  border-top: 1px solid var(--viewer-line);
}

.media-viewer__caption {
  max-width: 70ch;
  color: var(--viewer-ink);
  font-size: 10px;
  line-height: 1.5;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.media-viewer__caption:empty::before {
  content: "Qingbo Lab / Media";
  color: var(--viewer-muted);
}

.media-viewer__hint {
  flex: none;
  color: var(--viewer-muted);
  font-size: 9px;
  letter-spacing: .04em;
}

@media (max-width: 720px) {
  .media-viewer__surface {
    grid-template-rows: 44px minmax(0, 1fr) 42px;
    padding: 10px 10px 12px;
  }

  .media-viewer__identity span:nth-child(2),
  .media-viewer__identity span:nth-child(3),
  .media-viewer__hint {
    display: none;
  }

  .media-viewer__controls {
    gap: 3px;
  }

  .media-viewer__controls button {
    min-width: 30px;
    height: 29px;
    padding: 0 7px;
  }

  .media-viewer__controls .media-viewer__scale {
    min-width: 50px;
  }

  .media-viewer__controls .media-viewer__close {
    margin-left: 3px;
  }

  .media-viewer__caption {
    max-width: 100%;
    font-size: 9px;
  }
}

@media print {
  .media-viewer { display: none !important; }
}