* {
  box-sizing: border-box;
}
:root {
  color-scheme: dark;
  --bg: #0b0d10;
  --panel: #151a21;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #4aa3ff;
}
html,
body {
  height: 100%;
}
body {
  margin: 0;
  font-family: system-ui, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: grid;
  grid-template-rows: auto 1fr auto;
  overflow: hidden; /* keep the app within the viewport */
}
header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 16px;
  border-bottom: 1px solid #222a33;
  background: #0e1319;
}
header h1 {
  font-size: 18px;
  margin: 0;
}
.controls {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}
.toolbar {
  flex: 1;
  justify-content: space-between;
}
.toolbar .group {
  display: inline-flex;
  gap: 12px;
  align-items: center;
  padding-right: 12px;
  border-right: 1px solid #1b2330;
}
.toolbar .group:last-child {
  border-right: 0;
  padding-right: 0;
}
/* Always show precise cursor for canvases for marker interactions */
#vectorscope {
  cursor: crosshair;
}
#rgbParade {
  cursor: crosshair;
}
.controls label {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  color: var(--muted);
}
.controls .file input {
  display: none;
}
.btn,
.controls .file span {
  background: var(--accent);
  color: #001;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 36px;
  padding: 0 14px;
  min-width: 120px;
  white-space: nowrap;
  border-radius: 6px;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  border: 0;
}
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.btn:hover {
  filter: brightness(1.05);
}
.btn:active {
  transform: translateY(1px);
}
main {
  display: grid;
  grid-template-columns: 1fr 8px 1fr; /* left | splitter | right */
  gap: 12px;
  padding: 12px;
  min-height: 0; /* allow children to shrink */
  overflow: hidden; /* avoid page overflow */
}
.splitter {
  width: 8px;
  cursor: col-resize;
  background: linear-gradient(to bottom, #0f1420, #0a0e15);
  border: 1px solid #1a2230;
  border-radius: 6px;
}
.video-panel {
  background: var(--panel);
  border: 1px solid #222a33;
  border-radius: 10px;
  padding: 8px;
  display: grid;
  place-items: center;
  position: relative;
  min-height: 0;
  overflow: hidden;
}
video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #000;
  border-radius: 6px;
  position: relative;
  z-index: 1; /* below panel button */
}
.scopes {
  display: grid;
  gap: 12px;
  position: relative;
  grid-template-rows: minmax(0, 0.45fr) 8px minmax(0, 0.55fr); /* VS | splitter | WF */
  height: 100%;
  min-height: 0;
}
.scope {
  background: #000; /* panel background black */
  border: 1px solid #222a33;
  border-radius: 10px;
  padding: 8px;
  display: grid;
  grid-template-rows: 1fr auto; /* canvas area + caption */
  align-items: stretch;
  justify-items: stretch;
  position: relative; /* anchor for panel button */
  min-height: 0;
  overflow: hidden;
}
.splitter-h {
  width: auto;
  height: 8px;
  cursor: row-resize;
  background: linear-gradient(to right, #0f1420, #0a0e15);
  border: 1px solid #1a2230;
  border-radius: 6px;
}
/* Make canvases responsive while keeping crisp pixels */
canvas {
  width: 100%;
  height: 100%;
  display: block;
  image-rendering: pixelated;
}
.scope .caption {
  justify-self: center;
}
/* Ensure waveform canvas shows as black even before any pixels are drawn */
#rgbParade {
  background: #000;
}
/* Ensure vectorscope has a solid black base and subtle inner shadow */
#vectorscope {
  background: #000;
  box-shadow: inset 0 0 24px rgba(0, 0, 0, 0.6);
}
.caption {
  margin-top: 6px;
  color: var(--muted);
  font-size: 12px;
}
footer {
  padding: 8px 12px;
  color: var(--muted);
  border-top: 1px solid #222a33;
}

/* Panel maximize button */
.panel-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: rgba(74, 163, 255, 0.15);
  color: var(--text);
  border: 1px solid rgba(74, 163, 255, 0.35);
  border-radius: 6px;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  cursor: pointer;
  z-index: 5; /* keep above video/canvas */
}
.panel-btn:hover {
  background: rgba(74, 163, 255, 0.25);
}

/* Maximized layout */
.max-video main {
  grid-template-columns: 1fr 0 0 !important;
}
.max-scopes main {
  grid-template-columns: 0 0 1fr !important;
}

/* Per-scope maximize inside scopes column */
body.max-vs .scopes .scope-wf {
  display: none;
}
body.max-wf .scopes .scope-vs {
  display: none;
}
body.max-vs .splitter-h,
body.max-wf .splitter-h {
  display: none;
}

/* When a single scope is maximized, make it take the full height */
body.max-vs .scopes {
  grid-template-rows: 1fr !important;
}
body.max-wf .scopes {
  grid-template-rows: 1fr !important;
}
body.max-vs .scopes .scope-vs {
  grid-row: 1 / -1;
}
body.max-wf .scopes .scope-wf {
  grid-row: 1 / -1;
}

/* Hide maximize buttons on minimized panels */
body.max-video .scopes .panel-btn {
  display: none;
}
body.max-scopes .video-panel .panel-btn {
  display: none;
}
body.max-vs .scope-wf .panel-btn {
  display: none;
}
body.max-wf .scope-vs .panel-btn {
  display: none;
}

/* Hide the video column when a single scope panel is maximized */
body.max-vs main,
body.max-wf main {
  grid-template-columns: 0 0 1fr !important;
}

@media (max-width: 1000px) {
  main {
    grid-template-columns: 1fr;
  }
}