/* PianoVision for Meta Ray-Ban Display — 600x600 additive waveguide.
   Pure black = transparent. Surfaces must NOT be pure black (#0a-#1C range).
   Focus model per Meta display guidelines: idle content at 80% opacity, focused
   container eases in with a slight scale + glow (focus-on 475ms / off 625ms).
   Palette: PianoVision (pv-web styles.css + pv-frontend index.css). */

:root {
  --bg: #000000;
  --panel: #190c33;
  --panel-2: #2a1452;
  --panel-edge: rgba(255, 255, 255, 0.09);
  --panel-border: rgba(204, 158, 250, 0.32);
  --text: #ffffff;
  --text-dim: #c8a6e8;
  --text-faint: #7a6699;
  --accent: #cc9efa;
  --accent-strong: #993df5;
  --grad-a: #be6ef7;
  --grad-b: #800df2;
  --rh: #8c66ff;
  --lh: #f75b68;
  --good: #adfa9e;
  --warn: #ffd46a;
  --ease-on: cubic-bezier(0.6, 0, 0.4, 1);
  --ease-off: cubic-bezier(0.24, 0.24, 0.6, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 20px;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}

body { display: flex; justify-content: center; align-items: center; min-height: 100vh; }

#app {
  position: relative;
  width: 600px;
  height: 600px;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* subtle frame only when previewed in a big desktop window */
body.env-browser #app { outline: 1px solid #34204f; border-radius: 14px; }

/* ---------------------------------------------------------------- topbar */

#topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px 8px;
  flex: 0 0 auto;
}

#brand { font-size: 25px; font-weight: 800; letter-spacing: 0.2px; }
.brand-pv { color: var(--text); }
.brand-vision {
  color: var(--accent-strong);
  background: linear-gradient(100deg, var(--grad-a) 10%, var(--grad-b) 90%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.chip {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.3px;
  padding: 5px 13px;
  border-radius: 999px;
  border: 1.5px solid var(--text-dim);
  color: var(--text-dim);
  background: rgba(34, 16, 64, 0.55);
}
.chip-off { border-color: #3d2a59; color: var(--text-faint); }
.chip-ws { border-color: var(--warn); color: var(--warn); }
.chip-rtc { border-color: var(--good); color: var(--good); }

#screens { position: relative; flex: 1 1 auto; min-height: 0; }

/* Full-bleed immersive play: chrome hides, canvas owns all 600x600 */
#app.in-play #topbar, #app.in-play #hints { display: none; }
#app.in-play #screens { position: absolute; inset: 0; }

.screen {
  position: absolute;
  inset: 0;
  display: none;
  flex-direction: column;
  padding: 6px 24px 10px;
  min-height: 0;
}
.screen.active { display: flex; }
#screen-play, #screen-cows { padding: 0; }
#cows-canvas { width: 600px; height: 600px; display: block; background: var(--bg); }

.screen-title { font-size: 27px; font-weight: 800; flex: 0 0 auto; }
.screen-header { display: flex; align-items: center; gap: 14px; margin-bottom: 12px; flex: 0 0 auto; }

.back-btn {
  flex: 0 0 auto;
  width: 54px;
  height: 44px;
  border-radius: 12px;
  font-size: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--text-dim);
}
.back-btn:focus, .back-btn.is-focused { color: var(--accent); }

/* ---------------------------------------------------------------- focus */

.focusable {
  outline: none;
  border: 2px solid var(--panel-border);
  background:
    linear-gradient(180deg, var(--panel-edge), transparent 34%),
    var(--panel);
  /* faint idle glow so cards keep a visible edge on the additive waveguide,
     where the dark fill itself reads as near-transparent */
  box-shadow: 0 0 14px rgba(122, 76, 204, 0.10), inset 0 1px 0 rgba(255, 255, 255, 0.06);
  color: var(--text);
  font: inherit;
  text-align: left;
  cursor: pointer;
  border-radius: 16px;
  transition:
    transform 475ms var(--ease-on),
    border-color 200ms var(--ease-on),
    box-shadow 320ms var(--ease-on);
}
.focusable > * { opacity: 0.84; transition: opacity 320ms var(--ease-on); }
.focusable:focus, .focusable.is-focused {
  border-color: var(--accent);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.08), transparent 38%),
    var(--panel-2);
  box-shadow:
    0 0 0 2px rgba(204, 158, 250, 0.22),
    0 0 26px rgba(153, 61, 245, 0.34);
  transform: scale(0.978);
  transition:
    transform 475ms var(--ease-on),
    border-color 200ms var(--ease-on),
    box-shadow 320ms var(--ease-on);
}
.focusable:not(:focus):not(.is-focused) { transition-duration: 625ms; transition-timing-function: var(--ease-off); }
.focusable:focus > *, .focusable.is-focused > * { opacity: 1; }
.focusable:focus .row-value, .focusable.is-focused .row-value { color: var(--accent); }

/* ---------------------------------------------------------------- home */

.home-hero { flex: 0 0 auto; margin: 2px 2px 14px; }
.home-strip {
  display: flex;
  gap: 7px;
  height: 7px;
  margin-bottom: 11px;
}
.home-strip span { flex: 1; border-radius: 4px; background: var(--panel-2); }
.home-strip span:nth-child(2) { background: var(--rh); }
.home-strip span:nth-child(4) { background: var(--lh); }
.home-strip span:nth-child(5) { background: var(--accent-strong); }
.home-strip span:nth-child(7) { background: var(--good); }
.home-tagline { font-size: 15.5px; color: var(--text-faint); letter-spacing: 0.2px; }

.menu { display: flex; flex-direction: column; gap: 13px; }
.menu-compact { gap: 10px; margin-top: 16px; }

.menu-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 15px 18px;
}
.menu-tile {
  flex: 0 0 auto;
  width: 56px;
  height: 56px;
  border-radius: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(140deg, rgba(153, 61, 245, 0.32), rgba(128, 13, 242, 0.12));
  border: 1px solid rgba(204, 158, 250, 0.25);
}
.menu-icon { font-size: 27px; color: var(--accent); }
.menu-text { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.menu-title { font-size: 23px; font-weight: 700; }
.menu-sub { font-size: 14.5px; font-weight: 500; color: var(--text-dim); }
.menu-chevron { margin-left: auto; font-size: 30px; color: var(--text-faint); line-height: 1; }
.focusable:focus .menu-chevron, .focusable.is-focused .menu-chevron { color: var(--accent); }

.menu-compact .menu-item { padding: 12px 18px; font-size: 21px; font-weight: 700; justify-content: center; }

/* ---------------------------------------------------------------- song list */

.list {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 4px 2px 18px;
  scrollbar-width: none;
  -webkit-mask-image: linear-gradient(180deg, transparent 0, #000 14px, #000 calc(100% - 22px), transparent 100%);
  mask-image: linear-gradient(180deg, transparent 0, #000 14px, #000 calc(100% - 22px), transparent 100%);
}
.list::-webkit-scrollbar { display: none; }

.list-section {
  font-size: 13.5px;
  font-weight: 800;
  letter-spacing: 1.6px;
  text-transform: uppercase;
  color: var(--text-faint);
  padding: 12px 4px 3px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.list-section::after { content: ""; flex: 1; height: 1px; background: rgba(204, 158, 250, 0.14); }

.song-row {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 16px 11px 19px;
  flex: 0 0 auto;
  overflow: hidden;
}
/* emissive difficulty accent on the leading edge — colour reads on the waveguide
   even when the card fill does not, and reinforces the badge */
.song-row::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 10px;
  width: 4px;
  border-radius: 0 4px 4px 0;
  color: var(--accent);
  background: currentColor;
  opacity: 0.6;
  box-shadow: 0 0 8px currentColor;
}
.song-row.row-easy::before { color: var(--good); }
.song-row.row-medium::before { color: var(--warn); }
.song-row.row-hard::before { color: var(--lh); }
.song-row.is-focused::before, .song-row:focus::before { opacity: 0.95; }
.song-row .song-main { display: flex; flex-direction: column; gap: 2px; min-width: 0; flex: 1; }
.song-row .song-title {
  font-size: 20.5px;
  font-weight: 650;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.song-row .song-meta {
  font-size: 14px;
  color: var(--text-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.song-row .song-side {
  margin-left: auto;
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 3px;
}
.song-row .song-duration { font-size: 14px; color: var(--text-dim); font-variant-numeric: tabular-nums; }
.song-diff {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.song-diff.diff-easy { color: var(--good); }
.song-diff.diff-medium { color: var(--warn); }
.song-diff.diff-hard { color: var(--lh); }

/* ---------------------------------------------------------------- detail */

.detail-composer { color: var(--text-dim); font-size: 16.5px; margin: -4px 0 12px; }
.chips-row { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 18px; }
.chip-meta {
  font-size: 14px;
  font-weight: 700;
  padding: 5px 13px;
  border-radius: 999px;
  background: rgba(34, 16, 64, 0.6);
  border: 1px solid var(--panel-border);
  color: var(--text-dim);
}
.chip-meta.diff-easy { color: var(--good); border-color: rgba(173, 250, 158, 0.45); }
.chip-meta.diff-medium { color: var(--warn); border-color: rgba(255, 212, 106, 0.45); }
.chip-meta.diff-hard { color: var(--lh); border-color: rgba(247, 91, 104, 0.45); }

.play-button {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 13px;
  padding: 17px;
  font-size: 23px;
  font-weight: 800;
  letter-spacing: 0.3px;
  border-radius: 17px;
  color: #ffffff;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.16), transparent 40%),
    linear-gradient(120deg, var(--accent-strong), var(--grad-b));
  border-color: rgba(204, 158, 250, 0.4);
  margin-bottom: 15px;
  text-align: center;
}
.play-button > * { opacity: 1; }
.play-button:focus, .play-button.is-focused {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.22), transparent 42%),
    linear-gradient(120deg, #a855f7, #8b1ff5);
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(204, 158, 250, 0.32), 0 0 30px rgba(153, 61, 245, 0.6);
}
.play-icon { font-size: 19px; }

.row-nav { display: flex; align-items: center; gap: 11px; }
.nav-arrow { color: var(--text-faint); font-size: 23px; line-height: 1; font-weight: 400; }
.focusable:focus .nav-arrow, .focusable.is-focused .nav-arrow { color: var(--accent); }

.detail-grid { display: flex; flex-direction: column; gap: 10px; }
.detail-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 18px;
  font-size: 21px;
  font-weight: 650;
}
.row-value { color: var(--text-dim); font-weight: 650; }
.detail-hint { margin-top: 15px; font-size: 14.5px; line-height: 1.5; color: var(--text-faint); }
.detail-hint b { color: var(--text-dim); }

/* ---------------------------------------------------------------- sheet music */

#sheet-hud {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: -4px 2px 8px;
  font-size: 14.5px;
  color: var(--text-dim);
  flex: 0 0 auto;
}
#sheet-hud-time { font-variant-numeric: tabular-nums; }
.sheet-mode-badge {
  font-size: 10.5px;
  font-weight: 800;
  letter-spacing: 1px;
  padding: 3px 11px;
  border-radius: 999px;
  background: rgba(153, 61, 245, 0.28);
  border: 1px solid rgba(204, 158, 250, 0.5);
  color: var(--accent);
}
#sheet-hud-score { margin-left: auto; font-weight: 700; font-variant-numeric: tabular-nums; }
#sheet-hud-score.hot { color: var(--good); }
.sheet-wait {
  position: absolute;
  left: 50%;
  bottom: 20px;
  transform: translateX(-50%);
  background: rgba(46, 32, 8, 0.92);
  border: 1.5px solid rgba(255, 212, 106, 0.55);
  color: var(--warn);
  font-weight: 800;
  font-size: 15px;
  padding: 6px 17px;
  border-radius: 999px;
  white-space: nowrap;
  z-index: 2;
}

#sheet-wrap { position: relative; flex: 1 1 auto; min-height: 0; }
#sheet-scroll {
  position: absolute;
  inset: 0;
  overflow-y: auto;
  scroll-behavior: smooth;
  scrollbar-width: none;
  padding: 2px 14px 26px 2px;
  -webkit-mask-image: linear-gradient(180deg, transparent 0, #000 12px, #000 calc(100% - 26px), transparent 100%);
  mask-image: linear-gradient(180deg, transparent 0, #000 12px, #000 calc(100% - 26px), transparent 100%);
}
#sheet-scroll::-webkit-scrollbar { display: none; }
#sheet-host svg { display: block; }
#sheet-host.rendering { opacity: 0.25; }

#sheet-track {
  position: absolute;
  right: 2px;
  top: 10px;
  bottom: 14px;
  width: 3px;
  border-radius: 2px;
  background: rgba(200, 166, 232, 0.14);
}
#sheet-thumb {
  position: absolute;
  top: 0;
  width: 100%;
  border-radius: 2px;
  background: var(--accent-strong);
  box-shadow: 0 0 6px rgba(153, 61, 245, 0.5);
}
.sheet-status {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0 60px;
  color: var(--text-dim);
  font-size: 17px;
}
.sheet-status.hidden { display: none; }
.hidden { display: none; }

/* ---------------------------------------------------------------- connect */

.connect-status { display: flex; flex-direction: column; gap: 7px; margin-bottom: 6px; }
.connect-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 16px;
  background: linear-gradient(180deg, var(--panel-edge), transparent 40%), var(--panel);
  border: 1px solid rgba(204, 158, 250, 0.1);
  border-radius: 12px;
  font-size: 18px;
}
.connect-row .row-value { font-size: 16.5px; display: flex; align-items: center; gap: 9px; }
.row-value.ok, .row-value.warn { font-weight: 700; }
.row-value.ok { color: var(--good); }
.row-value.warn { color: var(--warn); }
.row-value.ok::before, .row-value.warn::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 8px currentColor;
}

/* ---------------------------------------------------------------- play */

#play-canvas { width: 600px; height: 600px; display: block; background: var(--bg); }

/* Shared pause / game-over overlay (play + cows). The on-screen menu is the
   on-device exit path: the system owns the middle pinch, so Escape never reaches
   the page — every immersive screen needs a focusable, pinch-reachable way out. */
.game-overlay {
  position: absolute;
  inset: 0;
  z-index: 5;
  background: radial-gradient(circle at 50% 42%, rgba(34, 16, 64, 0.62), rgba(0, 0, 0, 0.92) 75%);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 8px;
  padding: 0 84px;
}
.game-overlay.hidden { display: none; }
.game-overlay .menu { width: 100%; }
.game-overlay-title { font-size: 29px; font-weight: 800; margin-bottom: 4px; text-align: center; }
.game-overlay-sub { font-size: 15px; color: var(--text-dim); margin-bottom: 12px; text-align: center; }
.game-overlay-sub:empty { display: none; }

/* ---------------------------------------------------------------- results */

.results-stats { display: flex; flex-direction: column; gap: 8px; margin-top: 4px; }
.results-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: linear-gradient(180deg, var(--panel-edge), transparent 40%), var(--panel);
  border: 1px solid rgba(204, 158, 250, 0.1);
  border-radius: 12px;
  padding: 12px 17px;
  font-size: 19px;
  color: var(--text-dim);
}
.results-row .row-value { font-weight: 800; color: var(--text); font-variant-numeric: tabular-nums; }
.results-row.results-big {
  font-size: 21px;
  padding: 16px 18px;
  border-color: rgba(173, 250, 158, 0.3);
  background:
    linear-gradient(180deg, rgba(173, 250, 158, 0.07), transparent 50%),
    var(--panel);
}
.results-row.results-big .row-value { color: var(--good); font-size: 30px; text-shadow: 0 0 18px rgba(173, 250, 158, 0.45); }

/* ---------------------------------------------------------------- hints */

#hints {
  flex: 0 0 auto;
  text-align: center;
  font-size: 13.5px;
  letter-spacing: 0.3px;
  color: var(--text-faint);
  padding: 7px 0 11px;
}