/* Synth Move — palette et typographie reprises du thème Quick Swing (nilsou.fr) */
:root {
  --bg: #0a0a0a;
  --surface: #111111;
  --surface-alt: #1a1a2e;
  --contrast: #ffffff;
  --gray-700: #444444;
  --gray-500: #888888;
  --gray-300: #cccccc;

  --accent: #00ffcc;       /* I / i */
  --accent-2: #0099ff;     /* II / ii */
  --accent-violet: #8855ff;/* III / iii */
  --accent-3: #cc00ff;     /* IV / iv */
  --accent-alt: #ff2d78;   /* V / v */
  --accent-orange: #ff5500;/* VI / vi */
  --accent-gold: #ffcc00;  /* VII / vii */
  --accent-soft: #00ccaa;

  --chord-color: var(--accent);

  --font-display: 'Space Grotesk', 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Mono', monospace;

  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.09);
  --glass-blur: blur(16px);

  --transition-base: 0.4s cubic-bezier(0.23, 1, 0.32, 1);
  --transition-fast: 0.18s cubic-bezier(0.23, 1, 0.32, 1);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  overflow: hidden;
  overscroll-behavior: none;
  font-family: var(--font-mono);
  color: var(--contrast);
  -webkit-tap-highlight-color: transparent;
}

body.cursor-hidden { cursor: none; }

#stage {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100dvh;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
}

#webcam { display: none; }

#overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(120% 120% at 50% 10%, var(--surface-alt) 0%, var(--bg) 65%);
  transition: filter var(--transition-base);
}
#overlay.dimmed { filter: grayscale(1) brightness(0.45) blur(1px); }

/* ---------- Barre haute ---------- */
#hud {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: calc(12px + env(safe-area-inset-top)) calc(16px + env(safe-area-inset-right)) 12px calc(16px + env(safe-area-inset-left));
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.55) 0%, transparent 100%);
  transition: opacity var(--transition-base), transform var(--transition-base);
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--contrast);
  user-select: none;
}
.brand-mark {
  color: var(--accent);
  text-shadow: 0 0 8px color-mix(in srgb, var(--accent) 70%, transparent);
  font-size: 12px;
}
.brand-name em {
  font-style: normal;
  color: var(--accent);
}

.hud-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.key-picker {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: 999px;
  padding: 5px 6px 5px 12px;
}
.key-picker-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gray-300);
}
#keySelect {
  background: transparent;
  color: var(--accent);
  border: none;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  padding: 4px 6px;
  border-radius: 999px;
  cursor: pointer;
}
#keySelect:focus { outline: none; }
#keySelect option { background: var(--surface); color: var(--contrast); }

.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  color: var(--gray-300);
  cursor: pointer;
  transition: color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.icon-btn:hover, .icon-btn:focus-visible {
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 40%, transparent);
  box-shadow: 0 0 12px color-mix(in srgb, var(--accent) 35%, transparent);
  outline: none;
}
.icon-btn svg {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.icon-btn .icon-mute { display: none; }
.icon-btn.is-muted .icon-vol { display: none; }
.icon-btn.is-muted .icon-mute { display: block; }
.icon-btn.is-muted { color: var(--accent-alt); }
.icon-btn.is-active {
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 50%, transparent);
}

@media (pointer: coarse) {
  .icon-btn { width: 44px; height: 44px; }
  .icon-btn svg { width: 20px; height: 20px; }
  #keySelect { padding: 8px 6px; font-size: 14px; }
}

/* ---------- Jauge de volume + tonalité ---------- */
#volumeMeter {
  position: absolute;
  top: 64px;
  right: 16px;
  z-index: 4;
  display: flex;
  flex-direction: column-reverse;
  gap: 3px;
  pointer-events: none;
  transition: opacity var(--transition-base), transform var(--transition-base);
}
.vol-bar {
  width: 64px;
  height: 7px;
  border-radius: 4px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
}
.vol-bar.lit {
  background: linear-gradient(90deg, var(--accent-soft), var(--accent));
  border-color: transparent;
  box-shadow: 0 0 8px color-mix(in srgb, var(--accent) 45%, transparent);
}

#toneReadout {
  position: absolute;
  top: 214px;
  right: 16px;
  z-index: 4;
  font-size: 11px;
  color: var(--gray-300);
  text-align: right;
  letter-spacing: 0.03em;
  transition: opacity var(--transition-base);
}

.readout {
  font-family: var(--font-mono);
  pointer-events: none;
}

/* ---------- Accord courant ---------- */
#chordWrap {
  position: absolute;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  z-index: 4;
  text-align: center;
  pointer-events: none;
  transition: opacity var(--transition-base);
}
#chordDisplay {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(48px, 12vw, 88px);
  line-height: 1;
  color: var(--chord-color);
  text-shadow:
    0 0 12px color-mix(in srgb, var(--chord-color) 65%, transparent),
    0 0 36px color-mix(in srgb, var(--chord-color) 35%, transparent);
  transition: color var(--transition-fast), text-shadow var(--transition-fast);
}
#qualityReadout {
  margin-top: 2px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--gray-300);
}

/* ---------- Écran de démarrage ---------- */
#startOverlay {
  position: absolute;
  inset: 0;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background: radial-gradient(120% 100% at 50% 50%, rgba(0, 255, 204, 0.06) 0%, rgba(0, 0, 0, 0.72) 60%);
  backdrop-filter: blur(6px);
  cursor: default;
}
#loadingState, #readyState {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}
.start-circle {
  width: 76px;
  height: 76px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: var(--accent);
  cursor: pointer;
  box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 40%, transparent);
  animation: pulse-ring 2.4s ease-out infinite;
  transition: transform var(--transition-fast);
}
.start-circle:hover { transform: scale(1.05); }
@keyframes pulse-ring {
  0%   { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 40%, transparent); }
  70%  { box-shadow: 0 0 0 22px color-mix(in srgb, var(--accent) 0%, transparent); }
  100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 0%, transparent); }
}
.start-text {
  margin: 0;
  color: var(--gray-300);
  font-size: 14px;
  letter-spacing: 0.03em;
  text-align: center;
  max-width: 80vw;
}
.start-error {
  margin: 0;
  color: var(--accent-alt);
  font-size: 13px;
  max-width: 80vw;
  text-align: center;
}
.spinner {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 2px solid var(--glass-border);
  border-top-color: var(--accent);
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.hidden { display: none !important; }

/* ---------- Panneau d'aide ---------- */
#helpPanel {
  position: absolute;
  z-index: 20;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: min(720px, 92vw);
  max-height: 84vh;
  overflow-y: auto;
  background: var(--surface);
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: 15px;
  padding: 28px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px 28px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5), 0 0 40px color-mix(in srgb, var(--accent) 12%, transparent);
}
#helpPanel h2 {
  grid-column: 1 / -1;
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--contrast);
}
#helpPanel h3 {
  margin: 0 0 8px;
  font-size: 13px;
  font-family: var(--font-mono);
  color: var(--gray-300);
  font-weight: 500;
}
#helpPanel ul {
  margin: 0;
  padding-left: 18px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--gray-300);
}
#helpPanel ul.keys { list-style: none; padding-left: 0; display: flex; flex-direction: column; gap: 8px; }
#helpPanel b { color: var(--contrast); font-weight: 600; }
.help-col--keys { align-self: start; }

.hand-tag {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.03em;
}
.hand-tag--left { background: color-mix(in srgb, var(--accent-2) 18%, transparent); color: var(--accent-2); }
.hand-tag--right { background: color-mix(in srgb, var(--accent-alt) 18%, transparent); color: var(--accent-alt); }

kbd {
  display: inline-flex;
  min-width: 20px;
  justify-content: center;
  padding: 2px 7px;
  border-radius: 5px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  margin-right: 6px;
}

.help-close {
  position: absolute;
  top: 12px;
  right: 12px;
}

/* ---------- Petits écrans (téléphones, portrait ou paysage) ---------- */
#volumeMeter, #toneReadout {
  right: calc(16px + env(safe-area-inset-right));
}
#chordWrap {
  bottom: calc(18px + env(safe-area-inset-bottom));
}

@media (max-width: 640px) {
  #helpPanel { grid-template-columns: 1fr; padding: 22px 18px; }
  .key-picker-label { display: none; }
  .brand-name { font-size: 13px; }
  #volumeMeter { top: calc(60px + env(safe-area-inset-top)); }
  .vol-bar { width: 44px; }
  #toneReadout { top: calc(176px + env(safe-area-inset-top)); font-size: 10px; }
  #chordDisplay { font-size: clamp(40px, 16vw, 64px); }
}

/* Téléphones en paysage : viewport bas, HUD/jauge/accord doivent tenir dans
   la hauteur sans se chevaucher (max-height exclut tablettes/desktop). */
@media (max-height: 480px) and (orientation: landscape) {
  #hud { padding-top: calc(8px + env(safe-area-inset-top)); padding-bottom: 8px; }
  .icon-btn { width: 32px; height: 32px; }
  .icon-btn svg { width: 15px; height: 15px; }
  #volumeMeter { top: calc(48px + env(safe-area-inset-top)); gap: 2px; }
  .vol-bar { height: 5px; width: 40px; }
  #toneReadout { top: calc(110px + env(safe-area-inset-top)); font-size: 9px; }
  #chordDisplay { font-size: clamp(32px, 10vh, 56px); }
  #qualityReadout { font-size: 11px; }
  #chordWrap { bottom: calc(8px + env(safe-area-inset-bottom)); }
  #helpPanel { max-height: 92vh; padding: 16px 20px; gap: 12px 24px; }
  #helpPanel h2 { font-size: 16px; margin-bottom: 0; }
  #helpPanel ul { font-size: 12px; line-height: 1.4; }
  .start-circle { width: 60px; height: 60px; font-size: 20px; }
  #startOverlay { gap: 10px; }
  #loadingState, #readyState { gap: 10px; }
}