@font-face {
  font-family: 'Editorial New';
  src: url('../assets/fonts/EditorialNew-Ultralight.woff2') format('woff2');
  font-weight: 200;
  font-display: swap;
}

@font-face {
  font-family: 'Neue Haas Display';
  src: url('../assets/fonts/NeueHaasDisplayRoman.woff2') format('woff2');
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: 'Neue Haas Display';
  src: url('../assets/fonts/NeueHaasDisplayLight.woff2') format('woff2');
  font-weight: 300;
  font-display: swap;
}

:root {
  --bg-primary: #0b0b0d;
  --bg-panel: #1a1a1a;
  --text-primary: #e5e5e5;
  --text-secondary: #999;
  --border: #2a2a2a;
  --radius: 4px;

  /* Status/alert color — currently only used by the audio transient indicator. */
  --status-alert: orange;

  /* Shared font stack — centralizes the Neue Haas fallback chain.
     System fonts kick in if the webfont fails to load. */
  --font-display: 'Neue Haas Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Button elevation tokens — three states, shared across the cool-white
     utility family (toolbar-btn, mode-pills, about-close-btn, canvas-retry-btn).
     Intro Play uses its own warm-family recipe and is not unified here.

     Edge hairline is an inset box-shadow layer (not a CSS border) — avoids
     iOS 16+ composited-layer 0.5px rendering bug (affects border only, not
     inset shadows), sidesteps border-box layout shift, stacks cleanly with
     the drop shadow. No directional top-light layer — it rendered as
     asymmetric thickness on circular buttons. Depth now comes from edge +
     drop only.  Alpha values (0.08/0.16/0.06) tuned for dark backdrops per
     Linear/Vercel practice. None of these buttons use backdrop-filter —
     they all sit on solid dark backgrounds where blur is a no-op, and
     backdrop-filter on `border-radius: 50%` creates compositor-level AA
     artifacts on the circle's edge (Chromium bug 1229700, WebKit 202279). */
  --elevation-btn-rest:
    inset 0 0 0 1px rgba(255, 255, 255, 0.08),
    0 1px 3px rgba(0, 0, 0, 0.3);
  --elevation-btn-hover:
    inset 0 0 0 1px rgba(255, 255, 255, 0.16),
    0 1px 3px rgba(0, 0, 0, 0.30),
    0 4px 12px rgba(0, 0, 0, 0.12);
  --elevation-btn-pressed:
    inset 0 0 0 1px rgba(255, 255, 255, 0.06),
    inset 0 1px 2px rgba(0, 0, 0, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.15);

  /* Overlay cream palette — used in intro, about, and error overlays.
     Distinct from --text-primary/secondary (grayscale, used in sidebar).
     Most cream-* values share the same base rgb(245, 236, 218) at different
     alphas. --cream-subtitle is the exception: a separate warm hue (#d9d0bc)
     used canonically for subtitle text in both intro and about overlays. */
  --cream-primary: #f5ecda;                       /* titles, button labels, hints */
  --cream-secondary: rgba(245, 236, 218, 0.82);   /* body copy */
  --cream-subtitle: #d9d0bc;                      /* subtitles — warm cream */
  --cream-muted: rgba(245, 236, 218, 0.4);        /* credits, link default */
  --cream-muted-hover: rgba(245, 236, 218, 0.7);  /* link hover intermediate */
}

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

/* Hide the default disclosure triangle on all <details> panels — we render our own. */
summary::-webkit-details-marker {
  display: none;
}
summary {
  list-style: none;
}

body {
  font-family: var(--font-display);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  min-height: 100dvh;
  /* Safe area insets for notched devices (viewport-fit=cover) */
  padding:
    env(safe-area-inset-top, 0)
    env(safe-area-inset-right, 0)
    env(safe-area-inset-bottom, 0)
    env(safe-area-inset-left, 0);
}

/* Focus indicators — keyboard navigation only (mouse clicks stay clean) */
:focus-visible {
  outline: 2px solid rgba(200, 180, 120, 0.6);
  outline-offset: 2px;
}

/* Main layout */
.app-layout {
  display: grid;
  grid-template-columns: 1fr;
  height: 100vh;
  height: 100dvh;
}
.app-layout.panel-visible {
  grid-template-columns: 1fr 280px;
}
.app-layout.panel-visible .control-panel {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* Canvas area — wraps the aspect-locked content stack (canvas + toolbar).
   The .canvas-stack inside is a single unit — when it scales via --canvas-scale,
   both the canvas and its toolbar shrink/grow together, staying aligned. The
   stack is centered within canvas-area. Padding uses safe-area insets for
   notched devices (iPhone/Android cutouts). */
.canvas-area {
  display: grid;
  place-items: center;
  grid-template-columns: minmax(0, 1fr);
  min-height: 0;
  padding: clamp(8px, 2vmin, 32px);
  padding-top:    max(clamp(8px, 2vmin, 32px), env(safe-area-inset-top));
  padding-right:  max(clamp(8px, 2vmin, 32px), env(safe-area-inset-right));
  padding-bottom: max(clamp(8px, 2vmin, 32px), env(safe-area-inset-bottom));
  padding-left:   max(clamp(8px, 2vmin, 32px), env(safe-area-inset-left));
  overflow: hidden;
}

/* Canvas stack — the painting + toolbar as ONE visual unit. Shrinks as a
   whole via --canvas-scale so children (canvas + toolbar) always move
   together. Grid rows: 1fr for canvas, auto for toolbar. Max-width and
   max-height cap the unit at 75% of the canvas-area. */
.canvas-stack {
  --canvas-scale: 0.92;
  display: grid;
  grid-template-rows: 1fr auto;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  width: 100%;
  height: 100%;
  max-width:  calc(100% * var(--canvas-scale));
  max-height: calc(100% * var(--canvas-scale));
  min-width: 0;
  min-height: 0;
}

/* Hover-capable devices (desktop/trackpad): widen the canvas↔toolbar gap
   to give the ::after tooltips breathing room above the toolbar buttons.
   Touch devices keep the tighter 12px — tooltips are display:none there
   anyway (see the `@media (hover: none)` block) and mobile benefits from
   the reclaimed canvas height. Accessibility caveat: touch users have no
   way to see the tooltip copy at all — separate UX problem to address. */
@media (hover: hover) {
  .canvas-stack {
    gap: 24px;
  }
}

.canvas-container {
  position: relative;
  width: 100%;
  height: 100%;
  min-width: 0;
  min-height: 0;
  background: var(--bg-primary);
  overflow: hidden;
}

#glow-div {
  position: fixed;
  pointer-events: none;
  z-index: 0;
  will-change: box-shadow;
}

#preview-canvas,
#gl-canvas,
#trail-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  /* Load-bearing: canvas intrinsic dimensions (set by computeCanvasTarget in ui.js)
     don't always match the CSS box aspect. `object-fit: contain` letterboxes the
     drawing surface; computeContentRect() in ui.js assumes this behavior for click
     coordinate mapping. Removing this decouples visual render from click math. */
  object-fit: contain;
  touch-action: none;
}

#preview-canvas,
#gl-canvas {
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

#trail-canvas {
  pointer-events: none;
  z-index: 5;
}

#preview-canvas {
  display: none;
}

#gl-canvas {
  display: none;
}

#gl-canvas.active {
  display: block;
}

.canvas-placeholder {
  position: absolute;
  inset: 0;
  z-index: 8;  /* above gl-canvas (0) + trail-canvas (5), below intro-overlay (10) */
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-family: var(--font-display);
  font-size: 0.85rem;
}

.canvas-placeholder[hidden] {
  display: none;
}

/* ── Moon loading indicator ──
   Crescent moon with gradient edge stroke, feTurbulence grain, drop-shadow glow.
   Entrance: fade + scale in (0.6s). Breathe: opacity pulse (4.5s). Float: drift (6s).
   Exit: .moon-exit dissolves over 0.5s, placeholder hidden at 800ms. */
.moon-loader {
  position: relative;
  width: clamp(48px, 8vw, 80px);
  height: clamp(48px, 8vw, 80px);
  opacity: 0;
  transform: scale(0.92);
  filter: drop-shadow(0 0 2px rgba(185, 164, 37, 0.5))
          drop-shadow(0 0 6px rgba(185, 164, 37, 0.25))
          drop-shadow(0 0 16px rgba(185, 164, 37, 0.12));
  animation: moon-enter 0.6s cubic-bezier(0.0, 0.0, 0.2, 1) forwards,
             moon-breathe 4.5s ease-in-out 0.6s infinite,
             moon-float 6s ease-in-out infinite;
}

@keyframes moon-enter {
  from { opacity: 0; transform: scale(0.92); }
  to   { opacity: 0.6; transform: scale(1); }
}

/* Exit: moon dissolves */
.moon-loader.moon-exit {
  animation: moon-leave 0.5s cubic-bezier(0.4, 0.0, 1, 1) forwards;
}

@keyframes moon-leave {
  0%   { opacity: 1; transform: scale(1); }
  40%  { opacity: 0; transform: scale(0.97); }
  100% { opacity: 0; transform: scale(0.97); }
}

@keyframes moon-breathe {
  0%, 100% { opacity: 0.6; }
  50%      { opacity: 1; }
}

@keyframes moon-float {
  0%, 100% { translate: 0 1px; }
  50%      { translate: 0 -1px; }
}

.moon-svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}


/* ── Error type scale ──
   Same round(scale * px / 48, 1px) pattern as intro, with a higher floor
   so body text stays readable on mobile. At 48px: title 18, body 16, btn 16.
   At 36px (mobile floor): title 14, body 12, btn 12. */
.canvas-placeholder.canvas-error {
  /* --s floor of 36px (not 28 like intro/about) is purposeful. Errors are
     functional, not decorative — users need to read them quickly, not linger.
     A 28 floor would shrink body text to ~9px on phones, below every major
     design system's error-text minimum. 36 keeps body at 12px minimum. */
  --s: clamp(36px, 3.5vw + 0.25rem, 48px);
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-family: var(--font-display);
  font-size: round(calc(var(--s) * 16 / 48), 1px);
  font-weight: 300;
  line-height: 1.75;
  color: var(--cream-secondary);
  letter-spacing: calc(var(--s) * 1 / 48);
  text-wrap: pretty;
  padding: 24px;
  max-width: min(620px, 85vw);
  margin: auto;
}

.canvas-placeholder.canvas-error strong {
  display: block;
  margin-bottom: round(calc(var(--s) * 6 / 48), 1px);
  font-size: round(calc(var(--s) * 18 / 48), 1px);
  font-weight: 400;
  color: var(--cream-primary);
  text-wrap: balance;
}

/* Title/body separator is now the margin on the block-level strong above.
   Hide the <br> that existing HTML uses between title and body — keeps
   innerHTML strings unchanged while preventing a double line break. */
.canvas-placeholder.canvas-error br {
  display: none;
}

/* Pill-shaped CTA base — shared font, shape, padding, cursor between Retry
   (cool palette) and intro Play (warm palette). backdrop-filter lives on
   intro-play-btn only (it sits over the painting, where blur does real
   work); canvas-retry-btn sits on a solid dark error-state bg where it
   would be a no-op + introduce a compositor-edge artifact. */
.canvas-retry-btn,
.intro-play-btn {
  font-family: var(--font-display);
  font-size: clamp(12px, round(calc(var(--s) * 16 / 48), 1px), 16px);
  font-weight: 400;
  letter-spacing: calc(var(--s) * 0.6 / 48);
  color: var(--cream-primary);
  border-radius: 100px;
  padding: round(calc(var(--s) * 10 / 48), 1px) round(calc(var(--s) * 28 / 48), 1px);
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s, transform 0.15s;
}

.canvas-retry-btn {
  margin-top: round(calc(var(--s) * 16 / 48), 1px);
  background: rgba(255, 255, 255, 0.08);
}

.canvas-retry-btn:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.14);
  box-shadow: var(--elevation-btn-hover);
  transform: translateY(-0.5px);
}

.canvas-retry-btn:active:not(:disabled) {
  background: rgba(255, 255, 255, 0.04);
  box-shadow: var(--elevation-btn-pressed);
  transform: translateY(0.5px);
}

.canvas-retry-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Control panel */
.control-panel {
  display: none;
  padding: 1.25rem;
  border-left: 1px solid var(--border);
  background: var(--bg-panel);
  overflow-y: auto;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.control-group label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.control-group select {
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.5rem 0.6rem;
  font-size: 0.85rem;
  outline: none;
  transition: border-color 0.15s;
}

.control-group select:focus {
  border-color: var(--text-primary);
}

/* Keyboard-only focus ring — restores the outline that `outline: none` above suppresses. */
.control-group select:focus-visible {
  outline: 2px solid rgba(200, 180, 120, 0.6);
  outline-offset: 2px;
}

.control-group select:hover {
  border-color: var(--text-secondary);
}



/* Buttons */
/* Sliders */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

input[type="range"]:disabled {
  opacity: 0.25;
  cursor: not-allowed;
}

/* Keyboard-only focus ring — restores the outline that `outline: none` above suppresses. */
input[type="range"]:focus-visible {
  outline: 2px solid rgba(200, 180, 120, 0.6);
  outline-offset: 2px;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  background: #fff;
  border-radius: 50%;
  border: none;
  cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  background: #fff;
  border-radius: 50%;
  border: none;
  cursor: pointer;
}

.control-group label span {
  float: right;
  font-variant-numeric: tabular-nums;
}

/* Stats panel */
.stats-panel {
  margin-top: auto;
  border-top: 1px solid var(--border);
  padding-top: 1rem;
}

.stats-panel summary {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.copy-stats-btn {
  margin-left: auto;
  margin-right: 0.5rem;
  padding: 0.15rem 0.5rem;
  font-size: 0.65rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 3px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}

.copy-stats-btn:hover {
  color: var(--text-primary);
  border-color: var(--text-primary);
}

.stats-panel summary::after {
  content: '+';
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: transform 0.15s;
}

.stats-panel[open] summary::after {
  content: '\2212';
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  padding-top: 0.75rem;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.stat-item.full-width {
  grid-column: 1 / -1;
}

.stat-label {
  font-size: 0.65rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stat-value {
  font-size: 0.85rem;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.stat-value.highlight {
  color: #fff;
  font-weight: 600;
}

.stats-empty {
  grid-column: 1 / -1;
  font-size: 0.75rem;
  color: var(--text-secondary);
  padding: 0.25rem 0;
}

.vortex-control-row {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.vortex-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.vortex-control-label {
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.vortex-control-value {
  font-size: 0.65rem;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}

/* Scrollbar */
.control-panel::-webkit-scrollbar {
  width: 4px;
}

.control-panel::-webkit-scrollbar-track {
  background: transparent;
}

.control-panel::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 2px;
}

/* Panel copy buttons (reusable) */
.panel-copy-btn {
  margin-left: auto;
  margin-right: 0.5rem;
  padding: 0.15rem 0.5rem;
  font-size: 0.65rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 3px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}

.panel-copy-btn:hover {
  color: var(--text-primary);
  border-color: var(--text-primary);
}


/* Vortex group panel */
.vortex-group-panel {
  border-top: 1px solid var(--border);
  padding-top: 0.75rem;
}

.vortex-group-panel summary {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.vortex-group-panel summary::after {
  content: '+';
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: transform 0.15s;
}

.vortex-group-panel[open] summary::after {
  content: '\2212';
}

/* Sidebar tuning panels — shared by Mood Tuning + per-region tuning panels. */
.audio-tuning-panel {
  border-top: 1px solid var(--border);
  padding-top: 0.75rem;
}

.audio-tuning-panel summary {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.audio-tuning-panel summary::after {
  content: '+';
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: transform 0.15s;
}

.audio-tuning-panel[open] summary::after {
  content: '\2212';
}

.audio-tuning-content {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding-top: 0.75rem;
}

/* Small-caps section header reused across tuning panels (wind harp, village, horizon, sky gust, wake, etc.). */
.audio-meter-label {
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  width: 52px;
  flex-shrink: 0;
}

/* Audio tuning sliders */
.audio-tuning-content input[type="range"] {
  width: 100%;
}

/* ── Responsive breakpoints ── */

/* Tablet: narrower sidebar */
@media (max-width: 1024px) {
  .app-layout.panel-visible {
    grid-template-columns: 1fr 240px;
  }
}

/* Phone: single column, panel stacks below */
@media (max-width: 640px) {
  .app-layout {
    grid-template-columns: 1fr;
    height: 100vh;
    height: 100dvh;
  }
  .app-layout.panel-visible {
    grid-template-columns: 1fr;
  }

  .control-panel {
    border-left: none;
    border-top: 1px solid var(--border);
  }

}

/* Touch devices: 44pt minimum touch targets + suppress hover tooltips */
@media (hover: none) {
  .toolbar-btn {
    width: 44px;
    height: 44px;
  }

  .toolbar-icon {
    width: 22px;
    height: 22px;
  }

  .toolbar-btn::after {
    display: none;
  }

  .mode-pills {
    min-height: 44px;   /* touch target: outer track grows, inner pill becomes 38px */
  }

  .mode-pill::after {
    display: none;
  }

  .about-close-btn {
    width: 44px;
    height: 44px;
  }

  .about-close-btn svg {
    width: 20px;
    height: 20px;
  }
}


/* ── Intro overlay ── */
.intro-overlay {
  position: absolute;
  inset: 0;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.intro-overlay[hidden] {
  display: none;
}

/* Dismiss animation */
.intro-overlay.fade-out {
  animation: intro-dismiss 300ms cubic-bezier(0.4, 0.0, 1, 1) forwards;
  pointer-events: none;  /* prevent disabled button cursor during fade-out */
}

/* ── Staggered entrance: children start invisible, animate in sequentially ── */
.intro-overlay > * {
  opacity: 0;
}

.intro-overlay:not([hidden]):not(.fade-out) .intro-title {
  animation: intro-rise 600ms cubic-bezier(0.0, 0.0, 0.2, 1) forwards;
}

.intro-overlay:not([hidden]):not(.fade-out) .intro-subtitle {
  animation: intro-rise-sm 500ms cubic-bezier(0.0, 0.0, 0.2, 1) 300ms forwards;
}

.intro-overlay:not([hidden]):not(.fade-out) .intro-play-btn {
  animation: intro-appear 400ms cubic-bezier(0.0, 0.0, 0.2, 1) 600ms forwards;
}

.intro-overlay:not([hidden]):not(.fade-out) .intro-hint {
  animation: intro-appear 300ms cubic-bezier(0.0, 0.0, 0.2, 1) 800ms forwards;
}

/* ── Intro type scale ──
   Single --intro-scale reference. Every size = round(scale * px / 48, 1px).
   At 48px: title 48, subtitle 20, button 16, hint 14 — all integers.
   Letter-spacing unrounded (sub-pixel is fine for text advance). */
.intro-overlay {
  --s: clamp(28px, 3.5vw + 0.25rem, 48px);
}

.intro-title {
  font-family: 'Editorial New', Georgia, serif;
  font-size: round(var(--s), 1px);
  font-weight: 200;
  color: var(--cream-primary);
  letter-spacing: calc(var(--s) * 2 / 48);
  margin: 0 0 round(calc(var(--s) * 8 / 48), 1px);
  text-shadow: 0 0 20px rgba(0, 0, 0, 0.8), 0 0 40px rgba(0, 0, 0, 0.4);
}

.intro-subtitle {
  font-family: var(--font-display);
  font-size: clamp(14px, round(calc(var(--s) * 20 / 48), 1px), 20px);
  font-weight: 300;
  color: var(--cream-subtitle);
  letter-spacing: calc(var(--s) * 1 / 48);
  margin: 0 0 round(calc(var(--s) * 32 / 48), 1px);
  text-shadow: 0 0 20px rgba(0, 0, 0, 0.8), 0 0 40px rgba(0, 0, 0, 0.4);
}

.intro-play-btn {
  background: rgba(200, 180, 120, 0.10);
  border: 0.5px solid rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  pointer-events: auto;
}
/* Override browser default not-allowed cursor on disabled Play button.
   Button is disabled after click to prevent double-tap; cursor should
   stay as pointer (or default) during the 300ms fade-out animation. */
.intro-play-btn:disabled {
  cursor: default;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
}

button.intro-play-btn:hover {
  background: rgba(232, 224, 204, 0.18);
  border-color: rgba(232, 224, 204, 0.30);
  box-shadow:
    inset 0 0.5px 0 rgba(232, 224, 204, 0.10),
    0 1px 3px rgba(0, 0, 0, 0.30),
    0 6px 14px rgba(0, 0, 0, 0.12);
  transform: translateY(-0.5px);
}

button.intro-play-btn:active {
  background: rgba(232, 224, 204, 0.04);
  box-shadow:
    inset 0 1px 2px rgba(0, 0, 0, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.2);
  transform: translateY(0.5px);
}

.intro-hint {
  display: flex;
  align-items: center;
  gap: round(calc(var(--s) * 5 / 48), 1px);
  font-family: var(--font-display);
  font-size: clamp(10px, round(calc(var(--s) * 14 / 48), 1px), 14px);
  font-weight: 300;
  line-height: 1;
  color: var(--cream-primary);
  letter-spacing: calc(var(--s) * 1 / 48);
  text-shadow: 0 0 16px rgba(0, 0, 0, 0.8), 0 0 32px rgba(0, 0, 0, 0.4);
  margin: round(calc(var(--s) * 24 / 48), 1px) 0 0;
}

.intro-hint-icon {
  width: clamp(10px, round(calc(var(--s) * 14 / 48), 1px), 14px);
  height: clamp(10px, round(calc(var(--s) * 14 / 48), 1px), 14px);
  flex-shrink: 0;
}

/* Title: fade in + rise 16px */
@keyframes intro-rise {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Subtitle: fade in + rise 10px */
@keyframes intro-rise-sm {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Button & hint: pure fade, no motion */
@keyframes intro-appear {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* Dismiss: everything fades out together */
@keyframes intro-dismiss {
  to { opacity: 0; transform: scale(0.97); }
}
/* Release the button's backdrop-filter during the 300ms fade-out. The Play click
   also kicks off renderer.startReveal() — an expensive canvas animation that runs
   simultaneously. Dropping the blur here frees GPU for the reveal. Don't remove. */
.intro-overlay.fade-out .intro-play-btn {
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

/* ── Canvas Toolbar (row below canvas: utility group left, mode pills right) ──
   Width is set via inline style.width by ui.js (_syncToolbarToPaintingWidth) to
   match the painting's rendered width — the canvas container is letterboxed when
   viewport aspect doesn't match painting aspect (2048/1622), so toolbar needs to
   be sized independently to align its children with the painting's visual edges.
   Fallback width 100% applies only if JS fails to run. Safe-area padding lives
   on .canvas-area (the grid parent), not here. */
.canvas-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  width: 100%;
  max-width: 100%;
  justify-self: center;
  flex-shrink: 0;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}

.toolbar-group {
  display: flex;
  gap: 12px;
}

.canvas-toolbar.visible {
  opacity: 1;
  pointer-events: auto;
}

/* Circular icon buttons — restored to production recipe. Removing the border
   + backdrop-filter exposed the fill's AA gradient at the circular perimeter,
   which rendered as an uneven "gray ring" — the border previously sat on top
   of that AA and obscured it. Box-shadow is also overridden (not using the
   token) because a real border defines the edge here; the token's full inset
   ring would stack redundantly with the border. Keeps the token-based path
   for mode-pills/about-close-btn/canvas-retry-btn which don't have borders. */
.toolbar-btn {
  position: relative;  /* anchors the ::after tooltip */
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  color: rgba(255, 255, 255, 0.55);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  box-shadow:
    inset 0 0.5px 0 rgba(255, 255, 255, 0.08),
    0 1px 3px rgba(0, 0, 0, 0.3);
  transition: background 0.2s, color 0.2s, border-color 0.2s,
              box-shadow 0.2s, transform 0.15s;
}

.toolbar-btn:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.22);
  color: rgba(255, 255, 255, 0.9);
  box-shadow:
    inset 0 0.5px 0 rgba(255, 255, 255, 0.10),
    0 1px 3px rgba(0, 0, 0, 0.30),
    0 4px 12px rgba(0, 0, 0, 0.12);
  transform: translateY(-0.5px);
}

.toolbar-btn:active {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.10);
  color: rgba(255, 255, 255, 0.7);
  box-shadow:
    inset 0 1px 2px rgba(0, 0, 0, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.15);
  transform: translateY(0.5px);
}

.toolbar-icon {
  width: 20px;
  height: 20px;
}

/* Mute icon state — CSS controls visibility, JS toggles .muted class */
#mute-btn .icon-muted { display: none; }
#mute-btn.muted .icon-unmuted { display: none; }
#mute-btn.muted .icon-muted { display: inline; }

/* Tooltip */
.toolbar-btn::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 400;
  line-height: 1;       /* collapse line-box so no-descender words don't float high */
  letter-spacing: 0.2px;
  color: rgba(255, 255, 255, 0.85);
  background: rgba(255, 255, 255, 0.10);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  padding: 6px 8px;
  white-space: nowrap;
  box-shadow:
    inset 0 0.5px 0 rgba(255, 255, 255, 0.08),
    0 2px 8px rgba(0, 0, 0, 0.3);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.toolbar-btn:hover::after {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ── Mode pills — musical mode switch (Minor / Major) ──
   Segmented control, cool-white utility family. Active pill has subtle
   background fill; inactive is transparent. Tooltip pattern mirrors
   .toolbar-btn::after. */
.mode-pills {
  display: flex;
  align-items: stretch;
  min-height: 40px;         /* matches .toolbar-btn height — sibling rhythm */
  padding: 3px;             /* inset gap so active pill "floats" inside the track */
  border-radius: 999px;     /* pill-shaped track */
  background: rgba(255, 255, 255, 0.08);   /* matches .toolbar-btn bg for sibling harmony */
  box-shadow: var(--elevation-btn-rest);
}

.mode-pill {
  position: relative;   /* anchors the ::after tooltip */
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1 1 0;          /* equal width — active thumb lands at predictable positions */
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 400;     /* matches other UI text — weight 500 exhibited optical
                           asymmetry on mobile (thicker ascenders shifted visual
                           center upward beyond what metric compensation could
                           reach). Weight 400 renders at visual ink-center with
                           symmetric padding across all devices. */
  line-height: 1;
  letter-spacing: 0.5px;
  color: rgba(255, 255, 255, 0.55);
  background: transparent;
  border: none;
  border-radius: 999px; /* match the track — inner pill is also fully rounded */
  padding: 8px 16px;     /* 4px grid — same padding for all devices */
  cursor: pointer;
  transition: background 0.2s, color 0.2s,
              box-shadow 0.2s, transform 0.15s;  /* matches .toolbar-btn */
}

.mode-pill:hover:not(.is-active):not([aria-disabled="true"]) {
  background: rgba(255, 255, 255, 0.04);
  color: rgba(255, 255, 255, 0.8);
}

.mode-pill.is-active {
  background: rgba(255, 255, 255, 0.14);  /* track-to-pill contrast preserved (0.08 delta) */
  color: rgba(255, 255, 255, 0.95);
  box-shadow:
    inset 0 0.5px 0 rgba(255, 255, 255, 0.14),  /* top light-catch — subtle raise */
    0 1px 2px rgba(0, 0, 0, 0.25);              /* soft drop — pill floats on track */
}

/* Press state — mirrors .toolbar-btn:active (translateY + inset press shadow).
   Applies to both active and inactive pills; for inactive, adds a subtle bg dim
   so the press registers without requiring prior hover state. */
.mode-pill:active:not([aria-disabled="true"]) {
  transform: translateY(0.5px);
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.18);  /* overrides is-active's raise */
}

.mode-pill:active:not(.is-active):not([aria-disabled="true"]) {
  background: rgba(255, 255, 255, 0.04);
  color: rgba(255, 255, 255, 0.7);
}

.mode-pill[aria-disabled="true"] {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

/* Tooltip on mode pills — matches .toolbar-btn::after */
.mode-pill::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 400;
  line-height: 1;
  letter-spacing: 0.2px;
  color: rgba(255, 255, 255, 0.85);
  background: rgba(255, 255, 255, 0.10);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  padding: 6px 8px;
  white-space: nowrap;
  box-shadow:
    inset 0 0.5px 0 rgba(255, 255, 255, 0.08),
    0 2px 8px rgba(0, 0, 0, 0.3);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.mode-pill:hover::after {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ── About overlay ── */
.about-overlay {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: rgba(10, 10, 12, 0.97);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow-y: auto;
  overscroll-behavior: contain;
  opacity: 0;
  transition: opacity 0.35s cubic-bezier(0.0, 0.0, 0.2, 1);
}

.about-overlay[hidden] {
  display: none;
}

.about-overlay.visible {
  opacity: 1;
}

/* Close button — fixed to viewport, respects safe areas */
/* Restored to production recipe 2026-04-22 — matches .toolbar-btn's border +
   handwritten shadow structure for sibling consistency. NO backdrop-filter:
   about-overlay bg is ~97% opaque, so blur has no visible effect and only
   risks the circle-AA compositor artifact. Slightly subdued bg (0.06 vs
   toolbar 0.08) and color (0.5 vs 0.55) preserved for overlay context —
   close button intentionally reads a touch quieter than primary-surface
   toolbar buttons. */
.about-close-btn {
  position: fixed;
  top: calc(20px + env(safe-area-inset-top, 0px));
  right: calc(20px + env(safe-area-inset-right, 0px));
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.06);
  color: rgba(255, 255, 255, 0.5);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  z-index: 301;
  box-shadow:
    inset 0 0.5px 0 rgba(255, 255, 255, 0.08),
    0 1px 3px rgba(0, 0, 0, 0.3);
  transition: background 0.2s, color 0.2s, border-color 0.2s,
              box-shadow 0.2s, transform 0.15s;
}

.about-close-btn svg {
  width: 18px;
  height: 18px;
}

.about-close-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.22);
  color: rgba(255, 255, 255, 0.85);
  box-shadow:
    inset 0 0.5px 0 rgba(255, 255, 255, 0.10),
    0 1px 3px rgba(0, 0, 0, 0.30),
    0 4px 12px rgba(0, 0, 0, 0.12);
  transform: translateY(-0.5px);
}

.about-close-btn:active {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.10);
  color: rgba(255, 255, 255, 0.6);
  box-shadow:
    inset 0 1px 2px rgba(0, 0, 0, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.15);
  transform: translateY(0.5px);
}

/* ── About type scale ──
   Same proportional system as intro: single --s reference, all sizes
   as ratios of that variable. Tracking scales with font size so
   spacing feels consistent across viewport widths.
   At 48px: title 48, subtitle 20, body 16, credit 13. */
.about-overlay {
  --s: clamp(28px, 3.5vw + 0.25rem, 48px);
}

/* Content — centered column with comfortable reading measure */
.about-content {
  max-width: 600px;
  padding: round(calc(var(--s) * 80 / 48), 1px) round(calc(var(--s) * 24 / 48), 1px);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.4s cubic-bezier(0.0, 0.0, 0.2, 1) 0.1s,
              transform 0.4s cubic-bezier(0.0, 0.0, 0.2, 1) 0.1s;
}

.about-overlay.visible .about-content {
  opacity: 1;
  transform: translateY(0);
}

.about-title {
  font-family: 'Editorial New', Georgia, serif;
  font-weight: 200;
  font-size: round(var(--s), 1px);
  color: var(--cream-primary);
  letter-spacing: calc(var(--s) * 2 / 48);
  margin: 0 0 round(calc(var(--s) * 6 / 48), 1px);
  line-height: 1.1;
}

.about-subtitle {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(14px, round(calc(var(--s) * 20 / 48), 1px), 20px);
  color: var(--cream-subtitle);
  letter-spacing: calc(var(--s) * 1 / 48);
  margin: 0 0 round(calc(var(--s) * 40 / 48), 1px);
}

.about-body {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(12px, round(calc(var(--s) * 16 / 48), 1px), 16px);
  line-height: 1.75;
  color: var(--cream-secondary);
  letter-spacing: calc(var(--s) * 1 / 48);
}

.about-body p {
  margin: 0 0 1.4em;
}

.about-body p:last-child {
  margin-bottom: 0;
}

.about-footer {
  margin-top: round(calc(var(--s) * 48 / 48), 1px);
  padding-top: round(calc(var(--s) * 24 / 48), 1px);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  flex-direction: column;
  gap: round(calc(var(--s) * 4 / 48), 1px);
}

.about-credit {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(10px, round(calc(var(--s) * 13 / 48), 1px), 13px);
  color: var(--cream-muted);
  letter-spacing: calc(var(--s) * 1 / 48);
}

/* Inline link within the about footer credit. No underline, no color shift
   at rest — inherits cream-muted from the surrounding text so the footer
   reads as one line. Hover brightens the link (cream-muted → cream-muted-hover)
   as the sole signal that this text is interactive, with pointer cursor as
   secondary affordance. Editorial/minimal register matches the brand voice. */
.about-credit-link {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s;
}

.about-credit-link:hover {
  color: var(--cream-muted-hover);
}

/* :focus-visible inherits the global warm-cream outline from :root — no override needed. */

/* ── Audio Scope (bottom overlay, key 3) ── */
.audio-scope-canvas {
  position: fixed;
  bottom: 0;
  left: 0;
  z-index: 200;
  pointer-events: auto;
}