#mermaidViewport {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 400;
  flex-direction: column;
  padding: calc(var(--topbar-height, 60px) + 2vh) 24px calc(var(--diff-topbar-height, 70px) + 4vh);
  background: var(--primary);
  overflow-y: auto;
  font-family: 'classy', sans-serif;
}
body.mode-mermaid #mermaidViewport { display: flex; }
body.mermaid-fullscreen #topbar { display: none !important; }
body.mermaid-fullscreen #sidebar1 { display: none !important; }
body.mode-mermaid:not(.mermaid-fullscreen) #topbar { z-index: 401; }
body.mode-mermaid:not(.mermaid-fullscreen) #sidebar1 { z-index: 401; }
body.mode-mermaid .diff-bottombar.mermaid-bottombar { display: flex; }

#mermaidViewport .panel {
  display: none;
  flex: 1;
  flex-direction: column;
  animation: mermaidFadeIn 0.22s ease;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
}
#mermaidViewport .panel.active { display: flex; }
@keyframes mermaidFadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

#mermaidViewport button {
  background: var(--c-panel-2);
  color: var(--c-text-dim);
  padding: var(--btn-padding);
  cursor: pointer;
  font-size: 13px;
  font-family: inherit;
  transition: 0.15s;
  white-space: nowrap;
  outline: none;
  border: none;
  border-radius: 8px;
  user-select: none;
}
#mermaidViewport button:hover { background: var(--c-panel-3); color: var(--c-white); }
#mermaidViewport button:disabled { opacity: 0.35; pointer-events: none; }

#mermaidViewport input,
#mermaidViewport textarea {
  box-sizing: border-box;
  width: 100%;
  font-family: inherit;
  background: var(--c-panel-2);
  padding: 10px 12px;
  border-radius: 10px;
  color: inherit;
  outline: none;
  border: none;
}
#mermaidViewport input:hover { background: var(--c-panel-3); }
#mermaidViewport input:focus,
#mermaidViewport textarea:focus {
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--c-accent) 40%, transparent);
}
#mermaidViewport input[type="number"]::-webkit-outer-spin-button,
#mermaidViewport input[type="number"]::-webkit-inner-spin-button { opacity: 0; }

#mermaidViewport .btn {
  font-family: 'classy', sans-serif;
  font-size: 0.82rem;
  padding: var(--btn-padding);
  border-radius: 8px;
  background: var(--c-panel-2);
  color: var(--c-text-dim);
  cursor: pointer;
  transition: background 0.15s cubic-bezier(0.4, 0, 0.2, 1), border-color 0.15s cubic-bezier(0.4, 0, 0.2, 1), color 0.15s cubic-bezier(0.4, 0, 0.2, 1), transform 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  white-space: nowrap;
  user-select: none;
}
#mermaidViewport .btn:hover {
  color: var(--c-white);
  background: var(--c-panel);
  transform: translateY(1px);
}
#mermaidViewport .btn.btn-accent {
  background: var(--c-accent);
  color: var(--c-black);
  font-weight: 600;
}
#mermaidViewport .btn.btn-accent:hover { background: var(--c-accent); }
#mermaidViewport .btn:disabled { opacity: 0.35; pointer-events: none; transform: none; }

#mermaidViewport .panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background: var(--c-panel-3);
  gap: 12px;
  flex-wrap: wrap;
}
#mermaidViewport .header-label {
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-text-faint);
}
#mermaidViewport .btn-group { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }

/* Mermaid's code pane no longer lives inside #mermaidViewport at all — it's
   the shared CodeMirror editor in .note-container (mode-mermaid header:
   #mermaidPaneHeader / #mermaidCodeEmpty, styled alongside diffusion's
   .diff-pane-header / .pane-empty-state in main.css). #mermaidViewport now
   only handles the Flow (preview) and Tune (settings) fullscreen panels. */
.pane-header-actions { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }

#mermaidViewport .preview-wrapper {
  flex: 1;
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--c-panel-2);
  border: 1px solid color-mix(in srgb, var(--c-white) 8%, transparent);
  border-radius: 16px;
  overflow: hidden;
  min-height: 420px;
}

#mermaidViewport .preview-container {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: var(--c-black);
  cursor: grab;
  user-select: none;
  min-height: 360px;
}
#mermaidViewport .preview-container.panning { cursor: grabbing; }
#mermaidViewport .preview-stage { position: absolute; top: 0; left: 0; transform-origin: 0 0; will-change: transform; }
#mermaidViewport .preview-stage svg { display: block; overflow: visible; }
#mermaidViewport .preview-empty {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-text-faint);
  font-size: 1rem;
  text-align: center;
  opacity: 0.6;
  pointer-events: none;
}
#mermaidViewport .preview-error {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: var(--c-white);
  font-family: 'Source Code Pro', monospace;
  font-size: 0.82rem;
  padding: 22px 28px;
  text-align: center;
  line-height: 1.8;
  background: var(--c-panel-2);
  border-radius: 10px;
  max-width: 520px;
}
#mermaidViewport .zoom-controls { position: absolute; bottom: 14px; right: 14px; display: flex; gap: 6px; z-index: 10; }
/* 30px floating circular control — too small for the standard padding
   without breaking its circle, kept compact as a deliberate exception. */
#mermaidViewport .zoom-btn {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--c-panel-2);
  color: var(--c-text-dim);
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
}
#mermaidViewport .zoom-btn:hover { color: var(--c-white); }

#mermaidViewport .settings-wrapper {
  background: var(--c-panel-2);
  border: 1px solid color-mix(in srgb, var(--c-white) 8%, transparent);
  border-radius: 16px;
  padding: 28px 32px;
  display: flex;
  flex-direction: column;
  max-width: 660px;
  margin: 0 auto;
  width: 100%;
}
#mermaidViewport .settings-section {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-text-faint);
  margin-top: 22px;
  margin-bottom: 14px;
}
#mermaidViewport .settings-section:first-child { margin-top: 0; }
#mermaidViewport .settings-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 20px; }
#mermaidViewport .setting-item { display: flex; flex-direction: column; gap: 5px; }
#mermaidViewport .setting-item label { font-size: 0.82rem; color: var(--c-text-dim); }
#mermaidViewport .color-row { display: flex; align-items: center; gap: 8px; }
#mermaidViewport .setting-swatch {
  width: 28px !important;
  height: 28px !important;
  border-radius: 50% !important;
  background: var(--c-panel-3);
  border: 2px solid var(--c-accent) !important;
  cursor: pointer;
  flex-shrink: 0;
  padding: 0 !important;
}
#mermaidViewport .color-swatch-btn { transition: transform 0.15s ease; }
#mermaidViewport .color-swatch-btn:hover { transform: scale(1.08); outline: 2px solid var(--c-border); }
#mermaidViewport .color-swatch-btn.cp-active {
  border-radius: 8px;
  background: var(--c-panel-3);
  color: var(--c-white);
  font-family: 'Source Code Pro', monospace;
  font-size: 0.8rem;
}
#mermaidViewport .color-hex:hover { background: var(--c-black); }
#mermaidViewport .setting-input {
  padding: 8px 18px;
  border-radius: 8px;
  border: 1px solid var(--c-border);
  background: var(--c-panel);
  color: var(--c-white);
  font-family: 'Source Code Pro', monospace;
  font-size: 0.84rem;
  width: 100%;
}
#mermaidViewport .setting-input:hover { background: var(--c-black); }
#mermaidViewport .settings-actions { display: flex; gap: 10px; margin-top: 22px; justify-content: flex-end; }

#mermaidViewport .font-active-row { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
#mermaidViewport .font-active-label { font-size: 0.78rem; color: var(--c-text-faint); }
#mermaidViewport .font-active-badge {
  font-size: 0.84rem;
  color: var(--c-white);
  background: var(--c-panel-3);
  border-radius: 8px;
  padding: 3px 12px;
}
#mermaidViewport .font-block {
  background: var(--c-panel-3);
  border-radius: 10px;
  padding: 14px 16px;
  margin-bottom: 12px;
  display: flex;
  flex-direction: column;
  gap: 7px;
}
#mermaidViewport .font-block-title { font-size: 0.82rem; color: var(--c-white); }
#mermaidViewport .font-block-desc { font-family: 'Source Code Pro', monospace; font-size: 0.72rem; color: var(--c-text-faint); line-height: 1.5; }
#mermaidViewport .font-block-desc code { background: var(--c-panel-2); border-radius: 4px; padding: 1px 5px; font-size: 0.7rem; color: var(--c-text-dim); }
#mermaidViewport .font-upload-row { display: flex; align-items: center; gap: 8px; margin-top: 2px; flex-wrap: wrap; }
#mermaidViewport .font-upload-btn { flex-shrink: 0; cursor: pointer; }
#mermaidViewport .font-upload-name { flex: 1; font-family: 'Source Code Pro', monospace; font-size: 0.75rem; color: var(--c-text-faint); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
#mermaidViewport .font-gf-row { display: flex; align-items: center; gap: 8px; }
#mermaidViewport .font-gf-row .setting-input { flex: 1; }
#mermaidViewport .font-gf-row .btn { flex-shrink: 0; }

@media (max-width: 640px) {
  #mermaidViewport .settings-grid { grid-template-columns: 1fr; }
  #mermaidViewport .settings-wrapper { padding: 18px 16px; }
  #mermaidViewport .preview-container { min-height: 300px; }
}

.cp-popover {
  position: fixed;
  z-index: 100020;
  width: 220px;
  display: none;
  flex-direction: column;
  gap: 12px;
  padding: 14px;
  background: var(--c-panel-2);
  border: 1px solid color-mix(in srgb, var(--c-white) 8%, transparent);
  border-radius: 10px;
  font-family: 'Source Code Pro', monospace;
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity 0.15s ease, transform 0.15s ease;
}
.cp-popover.open { display: flex; opacity: 1; transform: translateY(0); }
.cp-sv {
  position: relative;
  width: 100%;
  height: 130px;
  border-radius: 8px;
  cursor: crosshair;
  background-image: linear-gradient(to top, #000 0%, rgba(0,0,0,0) 100%), linear-gradient(to right, #fff 0%, rgba(255,255,255,0) 100%);
  touch-action: none;
  overflow: hidden;
}
.cp-sv-thumb {
  position: absolute;
  width: 14px; height: 14px;
  border-radius: 50%;
  border: 2px solid var(--c-white);
  border-radius: 7px;
  cursor: pointer;
  background: linear-gradient(to right, hsl(0,100%,50%), hsl(60,100%,50%), hsl(120,100%,50%), hsl(180,100%,50%), hsl(240,100%,50%), hsl(300,100%,50%), hsl(360,100%,50%));
  touch-action: none;
}
.cp-hue-thumb {
  position: absolute;
  top: 50%;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--c-white);
  border: 2px solid var(--c-panel); height: 28px; border-radius: 50%; border: 2px solid var(--c-accent); flex-shrink: 0; box-sizing: border-box; }
.cp-hex-input {
  flex: 1;
  padding: 6px 10px !important;
  border-radius: 8px;
  background: var(--c-panel-3);
  color: var(--c-white);
  font-family: 'Source Code Pro', monospace;
  font-size: 0.78rem;
  text-transform: uppercase;
}
.cp-hex-input:hover { background: var(--c-black); }