:root {
  --bg: #0a0a0a;
  --text: #e9e6df;
  --muted: rgba(233, 230, 223, 0.55);
  --line: rgba(255, 255, 255, 0.22);
  --line-soft: rgba(255, 255, 255, 0.12);
  --panel: rgba(12, 12, 12, 0.62);
  --accent: #e6a13a;
  --accent-dim: rgba(230, 161, 58, 0.35);
  --focus: #4a9eff;
  --font: ui-monospace, "SFMono-Regular", "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
}

#stage { position: fixed; inset: 0; }

/* ---------------- Camera (full-bleed background) ---------------- */
.camera-frame {
  position: absolute;
  inset: 0;
  overflow: hidden;
  background: #000;
  z-index: 0;
}

#webcam { display: none; }

#overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

#overlay.dimmed { filter: saturate(0.6) brightness(0.62); }

#statusMsg {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  z-index: 2;
  padding: 20px;
  text-align: center;
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

#statusMsg.hidden { display: none; }

/* ---------------- Floating UI ---------------- */
.ui { position: absolute; z-index: 5; }

.ui-tl {
  top: 16px;
  left: 16px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
}

.ui-tr {
  top: 16px;
  right: 18px;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
}

.ui-bc {
  bottom: 26px;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  pointer-events: none;
}

/* Controls */
.ui-tl select,
.ui-tl button {
  font-family: var(--font);
  font-size: 0.82rem;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 7px 12px;
  cursor: pointer;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  appearance: none;
  transition: border-color 0.15s, color 0.15s;
}

.ui-tl select {
  padding-right: 26px;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--muted) 50%),
    linear-gradient(135deg, var(--muted) 50%, transparent 50%);
  background-position: right 12px center, right 7px center;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
}

.ui-tl select:hover,
.ui-tl button:hover { border-color: var(--accent); color: var(--accent); }

.ui-tl select:focus,
.ui-tl button:focus-visible { outline: 2px solid var(--focus); outline-offset: 1px; }

.ui-tl option { background: #111; color: var(--text); }

/* Gesture guide dropdown panel */
#gestureGuide {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 220px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

#gestureGuide.hidden { display: none; }

.gesture-guide-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-size: 0.8rem;
  color: var(--text);
}

.gesture-guide-note { color: var(--accent); }
.gesture-guide-gesture { font-size: 1rem; }

/* Volume meter (stacked horizontal bars) */
#volumeMeter {
  display: flex;
  flex-direction: column;
  gap: 3px;
  align-items: flex-end;
}

.vol-bar {
  width: 46px;
  height: 5px;
  border-radius: 1px;
  background: rgba(255, 255, 255, 0.16);
  transition: background 0.1s ease;
}

.vol-bar.lit { background: var(--accent); box-shadow: 0 0 8px var(--accent-dim); }

#distortionDisplay {
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--accent);
}

/* Chord readout */
#chordDisplay {
  font-size: clamp(2rem, 5vw, 3.1rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.08em;
  color: var(--accent);
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.6);
}

#qualityDisplay {
  margin-top: 8px;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* Help "?" button */
.ui-help {
  bottom: 18px;
  left: 18px;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--accent);
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.ui-help:hover { border-color: var(--accent); }

/* ---------------- Help modal ---------------- */
#helpModal.hidden { display: none; }

#helpModal {
  position: absolute;
  inset: 0;
  z-index: 30;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(0, 0, 0, 0.72);
  backdrop-filter: blur(3px);
}

.help-content {
  width: min(680px, 100%);
  max-height: 85vh;
  overflow: auto;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #0d0d0d;
  color: var(--text);
}

#closeHelp {
  float: right;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: transparent;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.82rem;
  padding: 6px 12px;
  cursor: pointer;
}

#closeHelp:hover { border-color: var(--accent); color: var(--accent); }

.help-content h2 { margin: 0 0 12px; font-size: 1.2rem; letter-spacing: 0.04em; }
.help-content h3 { margin: 0 0 8px; font-size: 0.95rem; color: var(--accent); letter-spacing: 0.04em; }
.help-content a { color: var(--accent); }
.help-content p { color: var(--muted); font-size: 0.86rem; line-height: 1.7; }
.help-content b { color: var(--text); }
.help-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 8px; }

/* ---------------- Start overlay ---------------- */
#startOverlay {
  position: absolute;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  padding: 24px;
  cursor: pointer;
  background: rgba(0, 0, 0, 0.82);
}

.start-card {
  width: min(420px, 100%);
  padding: 30px 28px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #0d0d0d;
  text-align: left;
}

.start-brand {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.start-title {
  margin: 10px 0 8px;
  font-size: clamp(1.9rem, 5vw, 2.4rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--accent);
}

.start-copy {
  margin: 0 0 22px;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

.start-cta {
  display: inline-block;
  border: 1px solid var(--accent);
  border-radius: 6px;
  background: transparent;
  color: var(--accent);
  font-family: var(--font);
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  padding: 11px 20px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.start-cta:hover { background: var(--accent); color: #0a0a0a; }

/* ---------------- Responsive ---------------- */
@media (max-width: 560px) {
  .ui-tl select, .ui-tl button { font-size: 0.76rem; padding: 6px 10px; }
  #gestureGuide { width: 190px; }
  .vol-bar { width: 38px; }
  .help-grid { grid-template-columns: 1fr; }
  .ui-bc { bottom: 20px; }
}