.mirrored {
  transform: scaleX(-1);
}
:root {
  --bg-top: #0f1723;
  --bg-bottom: #03060a;
  --surface: rgba(15, 23, 35, 0.72);
  --surface-border: rgba(115, 135, 160, 0.24);
  --text-main: #f5f8ff;
  --text-muted: #b8c6dd;
  --accent: #7df9d7;
  --accent-strong: #34d3b2;
  --danger: #ff6d6d;
  --shadow: 0 14px 34px rgba(0, 0, 0, 0.42);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  color: var(--text-main);
  background:
    radial-gradient(circle at 20% 5%, rgba(52, 211, 178, 0.12), transparent 30%),
    radial-gradient(circle at 82% 88%, rgba(125, 249, 215, 0.08), transparent 26%),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
}

.btn {
  padding: 0.45rem 0.75rem;
  font-size: 0.9rem;
  border-radius: 0.75rem;
  border: 1px solid var(--surface-border);
  background: rgba(15, 23, 35, 0.35);
  color: var(--text-main);
  cursor: pointer;
  line-height: 1;
  min-height: 2.25rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  user-select: none;
}

.btn:hover:not(:disabled) {
  transform: translateY(-1px);
  background: rgba(15, 23, 35, 0.5);
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.56;
}

.btn:focus-visible {
  outline: 2px solid rgba(125, 249, 215, 0.55);
  outline-offset: 2px;
}

.toggle-btn.is-active {
  border-color: rgba(125, 249, 215, 0.55);
  background: rgba(125, 249, 215, 0.12);
}

.app-shell {
  width: min(1100px, 94vw);
  margin: 1.25rem auto 2rem;
  padding: 1.5rem;
}

.page-header h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: 0.04em;
  text-align: center;
}

.page-header p {
  margin: 0.6rem 0 1.3rem;
  max-width: 60ch;
  color: var(--text-muted);
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 1.2rem;
}

.controls-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.7rem 1rem;
  align-items: center;
}

.controls > label,
.controls-row > label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-weight: 600;
  user-select: none;
}

.controls-row-slider {
  width: min(700px, 100%);
}

.controls-row-slider .threshold-control {
  width: 100%;
  justify-content: center;
}

.controls-row-slider input[type="range"] {
  width: min(210px, 35vw);
}
/* Old checkbox toggles removed in favor of buttons. */





.main-content {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  justify-content: flex-start;
  align-items: stretch;
  margin-top: 2rem;
}

.viz-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 400px));
  gap: 2rem;
  align-items: start;
  justify-content: center;
}

.viz-block {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: 1rem;
  box-shadow: var(--shadow);
  backdrop-filter: blur(6px);
  padding: 1rem;
}

.viz-block canvas {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  max-width: 400px;
  border-radius: 0.7rem;
  border: 1px solid rgba(125, 249, 215, 0.28);
  background: #000;
  image-rendering: pixelated;
}

@media (max-width: 900px) {
  .main-content {
    gap: 1rem;
  }
  .viz-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}
#stopBtn {
  background: rgba(255, 109, 109, 0.14);
  color: #ffd1d1;
  border-color: rgba(255, 109, 109, 0.4);
}

#stopBtn:hover:not(:disabled) {
  transform: translateY(-1px);
  background: rgba(255, 109, 109, 0.24);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.56;
}


.density-control {
  justify-self: end;
  display: flex;
  gap: 0.6rem;
  align-items: center;
  color: var(--text-muted);
}


#sampleWidthRange {
  width: min(300px, 40vw);
}


#sampleWidthValue {
  min-width: 56px;
  color: var(--text-main);
  font-weight: 700;
}


.panels {
  display: grid;
  grid-template-columns: 2fr 1fr;
  grid-template-rows: auto auto;
  gap: 1rem;
  align-items: start;
}

.panel-video {
  grid-column: 1;
  grid-row: 1;
}
.panel-videogram-vert {
  grid-column: 2;
  grid-row: 1 / span 2;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: stretch;
  /* Remove any width restrictions so canvas can match video width */
}
.panel-videogram-horiz {
  grid-column: 1;
  grid-row: 2;
}


.main-content h2 {
  margin: 0 0 0.2rem;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.2;
  /* Keep layout tight and avoid wrapping-induced misalignment */
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Individual videogram canvas rules are handled by `.viz-block canvas`. */

@media (max-width: 900px) {
  .controls {
    grid-template-columns: 1fr 1fr 1fr;
  }

  .mirror-toggle {
    grid-column: 1 / -1;
    justify-self: start;
  }

  .density-control {
    grid-column: 1 / -1;
    justify-self: start;
  }

  .panels {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
  }
  .panel-videogram-vert {
    grid-column: 1;
    grid-row: 1;
  }
  .panel-video {
    grid-column: 1;
    grid-row: 2;
  }
  .panel-videogram-horiz {
    grid-column: 1;
    grid-row: 3;
  }
}