/* ============================================================
   PixelDust — Pixel Particle Creator
   Dark pixel-art tool UI, inspired by Aseprite aesthetics
   ============================================================ */

/* ── Reset & base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* Core palette */
  --bg-app:       #0c0c0e;
  --bg-panel:     #14141a;
  --bg-group:     #1c1c24;
  --bg-input:     #0f0f14;
  --bg-hover:     #26262f;
  --border:       #2a2a35;
  --border-light: #3a3a4a;

  /* Text */
  --text-primary:   #e0e0ec;
  --text-secondary: #7a7a8e;
  --text-label:     #9898ae;

  /* Accent */
  --accent:       #7b5ea7;
  --accent-hover: #9b7ec7;
  --accent-glow:  rgba(123, 94, 167, 0.4);

  --green:        #44c944;
  --green-dark:   #1e6e1e;
  --red:          #d94444;
  --yellow:       #d9a840;

  /* Sizes */
  --topbar-h:  44px;
  --panel-w:   224px;
  --radius:    3px;
  --font-mono: 'Courier New', Courier, monospace;
  --font-ui:   system-ui, -apple-system, sans-serif;
}

html, body { height: 100%; overflow: hidden; }

/* Stop mobile browsers from silently rescaling text (source of
   phone-vs-small-window inconsistencies) */
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }

body {
  font-family: var(--font-ui);
  font-size: 12px;
  background: var(--bg-app);
  color: var(--text-primary);
  user-select: none;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: var(--bg-panel); }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ============================================================
   TOP BAR
   ============================================================ */
#topbar {
  height: var(--topbar-h);
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 12px;
  gap: 8px;
  flex-shrink: 0;
  z-index: 10;
}

#logo {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin-right: 10px;
  flex-shrink: 0;
}

.logo-px {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: bold;
  background: var(--accent);
  color: #fff;
  padding: 2px 5px;
  border-radius: 2px;
  letter-spacing: 1px;
}

.logo-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: 0.3px;
}

.logo-version {
  font-size: 9px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  background: none;
  border: none;
  padding: 2px 4px;
  cursor: pointer;
}
.logo-version:hover { color: var(--accent-hover); text-decoration: underline; }

#topbar-controls {
  display: flex;
  align-items: center;
  gap: 5px;
  flex: 1;
}

.topbar-sep {
  width: 1px;
  height: 18px;
  background: var(--border);
  margin: 0 3px;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 5px 11px;
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  background: var(--bg-group);
  color: var(--text-primary);
  font-size: 11px;
  font-family: var(--font-ui);
  cursor: pointer;
  transition: background 0.1s, border-color 0.1s, color 0.1s, box-shadow 0.1s;
  white-space: nowrap;
  line-height: 1;
}
.btn:hover  { background: var(--bg-hover); border-color: var(--accent); }
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--green);
  border-color: var(--green-dark);
  color: #0e1e0e;
  font-weight: 700;
}
.btn-primary:hover { background: #5ade5a; border-color: #2a9a2a; }

.btn-secondary { background: var(--bg-group); }

.btn-accent {
  background: var(--accent);
  border-color: #5a3e85;
  color: #fff;
  font-weight: 600;
}
.btn-accent:hover {
  background: var(--accent-hover);
  border-color: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
}

.btn-sm {
  font-size: 10px;
  padding: 2px 8px;
  min-width: 28px;
  line-height: 1.4;
  background: var(--bg-panel);
  border: 1px solid var(--border-light);
  color: var(--text-primary);
  border-radius: 3px;
  cursor: pointer;
}
.btn-sm:hover { background: var(--border); }

.btn-icon {
  padding: 5px 8px;
}
.btn-icon svg { display: block; }
.btn-symbol {
  display: block;
  width: 15px;
  height: 15px;
  flex: 0 0 auto;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.btn-symbol-fill {
  fill: currentColor;
  stroke: none;
}

/* Elements that only exist in the phone layout */
.mobile-only { display: none; }

/* ── Mobile preset bottom sheet ─────────────────────────────────────── */
#preset-sheet { position: fixed; inset: 0; z-index: 400; }
#preset-sheet.hidden { display: none; }
#mobile-action-sheet { position: fixed; inset: 0; z-index: 410; }
#mobile-action-sheet.hidden { display: none; }
html.sheet-open { overflow: hidden; }
body.sheet-open {
  position: fixed;
  left: 0;
  right: 0;
  overflow: hidden;
  width: 100%;
}
.sheet-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(2px);
}
.sheet-panel {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  max-height: 74dvh;
  overflow-y: auto;
  background: var(--bg-panel);
  border-top: 1px solid var(--border-light);
  border-radius: 8px 8px 0 0;
  padding: 6px 16px calc(24px + env(safe-area-inset-bottom, 0px));
  box-shadow: 0 -12px 48px rgba(0, 0, 0, 0.7);
}
.sheet-title {
  margin: -2px 0 12px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  text-align: center;
}
.action-sheet-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}
.action-sheet-grid .btn {
  min-height: 44px;
  width: 100%;
  padding: 12px 8px;
}
.sheet-handle {
  width: 44px;
  height: 4px;
  border-radius: 2px;
  background: var(--border-light);
  margin: 10px auto 16px;
}
.sheet-actions {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
}
.sheet-actions .btn {
  flex: 1;
  padding: 14px 8px;
  font-size: 15px;
}
#sheet-preset-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}
#sheet-preset-grid .sheet-preset {
  padding: 14px 8px;
  font-size: 15px;
  background: var(--bg-group);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  color: var(--text-primary);
  cursor: pointer;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
#sheet-preset-grid .sheet-preset.active {
  border-color: var(--accent);
  color: var(--accent);
}
.btn-sm.active {
  background: var(--accent);
  color: #000;
  border-color: var(--accent);
}

.full-width { width: 100%; }

.hidden { display: none !important; }

/* ============================================================
   EFFECT PRESET BAR
   ============================================================ */
#preset-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  flex-wrap: wrap;
}

.preset-bar-label {
  font-size: 9px;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
  flex-shrink: 0;
}

#effect-preset-btns {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.effect-preset-btn {
  font-size: 11px;
  padding: 3px 9px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-input);
  color: var(--text-label);
  cursor: pointer;
  font-family: var(--font-ui);
  transition: background 0.1s, color 0.1s, border-color 0.1s, box-shadow 0.1s;
  white-space: nowrap;
}
.effect-preset-btn:hover {
  background: var(--bg-hover);
  border-color: var(--accent);
  color: var(--text-primary);
}
.effect-preset-btn.active {
  background: var(--accent);
  border-color: var(--accent-hover);
  color: #fff;
  box-shadow: 0 0 6px var(--accent-glow);
}
/* ── Custom user presets ── */
.preset-sep {
  color: var(--text-dim);
  font-size: 12px;
  opacity: 0.35;
  padding: 0 2px;
  user-select: none;
}
.custom-preset-wrap {
  position: relative;
  display: inline-flex;
  align-items: center;
}
.custom-preset-btn {
  border-color: var(--accent) !important;
  border-style: dashed !important;
}
.custom-preset-btn.active {
  border-style: solid !important;
}
.custom-preset-del {
  position: absolute;
  top: -5px;
  right: -5px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: none;
  background: #c44;
  color: #fff;
  font-size: 10px;
  line-height: 14px;
  text-align: center;
  padding: 0;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s;
  z-index: 2;
}
.custom-preset-wrap:hover .custom-preset-del {
  opacity: 1;
}
.custom-preset-del:hover {
  background: #f44;
}
#btn-save-preset {
  transition: background 0.15s, box-shadow 0.15s;
}
#btn-save-preset.flash {
  background: var(--accent) !important;
  box-shadow: 0 0 8px var(--accent-glow);
  color: #fff;
}


/* ============================================================
   MAIN LAYOUT
   ============================================================ */
#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

#main {
  display: flex;
  flex: 1;
  overflow: hidden;
  min-height: 0;
}

/* ── Side panels ── */
#panel-left,
#panel-right {
  width: var(--panel-w);
  flex-shrink: 0;
  background: var(--bg-panel);
  overflow-y: auto;
  padding: 6px 0;
}

#panel-left  { border-right: 1px solid var(--border); }
#panel-right { border-left:  1px solid var(--border); }

/* ── Control groups ── */
.ctrl-group {
  padding: 8px 10px 10px;
  border-bottom: 1px solid var(--border);
}
.ctrl-group:last-child { border-bottom: none; }

/* Collapsible cards: tap/click the header to fold */
.ctrl-group > .group-label {
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.ctrl-group > .group-label::after {
  content: '';
  width: 7px;
  height: 7px;
  border-right: 2px solid var(--text-secondary);
  border-bottom: 2px solid var(--text-secondary);
  transform: rotate(45deg) translateY(-2px);
  transition: transform 0.15s ease;
  margin-left: 8px;
  flex: 0 0 auto;
}
.ctrl-group.collapsed > .group-label::after { transform: rotate(-45deg); }
.ctrl-group.collapsed > :not(.group-label) { display: none !important; }
.ctrl-group.collapsed > .group-label { margin-bottom: 0; }

/* Custom color picker popover (desktop) */
#ccp-pop {
  position: fixed;
  z-index: 500;
  width: 216px;
  padding: 10px;
  background: var(--bg-panel, #141419);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.55);
}
#ccp-pop.hidden { display: none; }
#ccp-sv-wrap { position: relative; width: 196px; height: 140px; cursor: crosshair; }
#ccp-sv { display: block; border-radius: 6px; }
#ccp-knob {
  position: absolute;
  width: 12px;
  height: 12px;
  border: 2px solid #fff;
  border-radius: 50%;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.6);
  transform: translate(-6px, -6px);
  pointer-events: none;
}
#ccp-hue {
  width: 100%;
  height: 12px;
  margin: 10px 0;
  appearance: none;
  -webkit-appearance: none;
  border-radius: 6px;
  background: linear-gradient(to right, #f00, #ff0, #0f0, #0ff, #00f, #f0f, #f00);
}
#ccp-hue::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid #333;
  cursor: pointer;
}
#ccp-row { display: flex; align-items: center; gap: 6px; }
#ccp-swatch {
  width: 26px;
  height: 26px;
  border-radius: 6px;
  border: 1px solid var(--border);
  flex: 0 0 auto;
}
#ccp-hex {
  flex: 1 1 auto;
  min-width: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 5px 6px;
  background: var(--bg-app);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 6px;
}
#ccp-row .btn { padding: 5px 9px; min-height: 0; }

/* Patch notes modal */
.patch-notes-box { width: min(94vw, 460px); }
#patch-notes-list { max-height: 55dvh; overflow-y: auto; margin: 12px 0 14px; }
.pn-entry { margin-bottom: 18px; }
.pn-head { display: flex; align-items: baseline; gap: 8px; margin-bottom: 6px; }
.pn-version { font-family: var(--font-mono); font-weight: 700; color: var(--accent-hover); font-size: 14px; }
.pn-date { font-size: 11px; color: var(--text-secondary); }
.pn-entry ul { margin: 0; padding-left: 18px; }
.pn-entry li { font-size: 12.5px; line-height: 1.55; color: var(--text-primary); margin-bottom: 5px; }
.patch-notes-box > .btn { width: 100%; }

.group-label {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 8px;
  font-family: var(--font-mono);
}

/* ── Control rows ── */
.ctrl-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  margin-bottom: 6px;
  cursor: default;
}
.ctrl-row:last-child { margin-bottom: 0; }

.ctrl-row > span {
  color: var(--text-label);
  font-size: 11px;
  flex-shrink: 0;
  min-width: 68px;
}

/* ── Sliders ── */
.slider-pair {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1;
  min-width: 0;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  flex: 1;
  height: 3px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
  min-width: 0;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 11px;
  height: 11px;
  background: var(--accent);
  border: 1px solid var(--accent-hover);
  border-radius: 2px; /* pixel-art square thumb */
  cursor: pointer;
  transition: background 0.1s, box-shadow 0.1s;
}
input[type="range"]::-webkit-slider-thumb:hover {
  background: var(--accent-hover);
  box-shadow: 0 0 5px var(--accent-glow);
}
input[type="range"]:focus-visible {
  outline: 1px solid var(--accent);
  outline-offset: 2px;
}

.val-display {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-secondary);
  min-width: 34px;
  text-align: right;
}

/* ── Select dropdowns ── */
select {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 11px;
  padding: 3px 6px;
  cursor: pointer;
  outline: none;
  flex: 1;
}
select:hover { border-color: var(--border-light); }
select:focus { border-color: var(--accent); }

/* ── Toggle checkbox ── */
input[type="checkbox"].toggle {
  -webkit-appearance: none;
  appearance: none;
  width: 26px;
  height: 14px;
  background: var(--bg-input);
  border: 1px solid var(--border-light);
  border-radius: 7px;
  position: relative;
  cursor: pointer;
  transition: background 0.2s;
  flex-shrink: 0;
}
input[type="checkbox"].toggle::after {
  content: '';
  position: absolute;
  top: 2px; left: 2px;
  width: 8px; height: 8px;
  background: var(--text-secondary);
  border-radius: 50%;
  transition: transform 0.15s, background 0.15s;
}
input[type="checkbox"].toggle:checked {
  background: var(--accent);
  border-color: var(--accent-hover);
}
input[type="checkbox"].toggle:checked::after {
  transform: translateX(12px);
  background: #fff;
}

/* ── Color inputs ── */
input[type="color"] {
  -webkit-appearance: none;
  appearance: none;
  width: 28px;
  height: 20px;
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  background: none;
  cursor: pointer;
  padding: 1px;
  flex-shrink: 0;
}
input[type="color"]::-webkit-color-swatch-wrapper { padding: 0; }
input[type="color"]::-webkit-color-swatch { border: none; border-radius: 1px; }

/* ============================================================
   COLOR PANEL (right side)
   ============================================================ */

/* ── Segmented toggle ── */
.seg-toggle {
  display: flex;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.seg-btn {
  flex: 1;
  padding: 3px 10px;
  font-size: 10px;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: var(--bg-input);
  color: var(--text-secondary);
  border: none;
  cursor: pointer;
  transition: background 0.12s, color 0.12s;
}
.seg-btn + .seg-btn { border-left: 1px solid var(--border); }
.seg-btn:hover { color: var(--text); }
.seg-btn.active {
  background: var(--accent);
  color: #fff;
}

/* ── Single color row ── */
#single-color-row {
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

#single-color-row .ctrl-row {
  margin-bottom: 0;
}

#single-color-row input[type="color"] {
  width: 28px;
  height: 20px;
}

#palette-area {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  column-gap: 6px;
  row-gap: 8px;
  align-items: start;
}

/* ── Palette grid ── */
#palette-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 0;
  min-width: 0;
  overflow: visible;
}

.pal-swatch {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  border: 2px solid transparent;
  padding: 0;
  width: 24px;
  height: 24px;
  flex: 0 0 auto;
  box-sizing: border-box;
  cursor: pointer;
  border-radius: 2px;
  transition: transform 0.08s, border-color 0.08s;
  background: none;
}
.pal-swatch::-webkit-color-swatch-wrapper { padding: 0; }
.pal-swatch::-webkit-color-swatch { border: none; border-radius: 1px; }
.pal-swatch::-moz-color-swatch { border: none; }
.pal-swatch:hover {
  transform: scale(1.08);
  border-color: rgba(255,255,255,0.4);
  z-index: 2;
  position: relative;
}
.pal-swatch.active {
  border-color: #fff;
  box-shadow: 0 0 4px rgba(255,255,255,0.3);
}

/* ── Palette tools (+/−) ── */
#palette-tools {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 0;
  align-self: start;
}
#palette-tools button {
  width: 24px;
  height: 20px;
  font-size: 14px;
  line-height: 1;
  border: 1px solid var(--border);
  border-radius: 2px;
  background: var(--bg-input);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.1s, color 0.1s;
}
#palette-tools button:hover {
  background: var(--accent);
  color: #fff;
}

/* ── Preset buttons (3-column grid) ── */
#palette-presets {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3px;
  grid-column: 1 / -1;
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.preset-btn {
  font-size: 10px;
  padding: 4px 6px;
  border: 1px solid var(--border);
  border-radius: 2px;
  background: var(--bg-input);
  color: var(--text-secondary);
  cursor: pointer;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: background 0.1s, color 0.1s, border-color 0.1s;
  text-align: center;
}
.preset-btn:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent-hover);
}
.preset-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent-hover);
}

/* ── Fade-to sub-panel ── */
#fade-to-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  column-gap: 6px;
  row-gap: 6px;
  align-items: start;
  border-left: 2px solid rgba(255,255,255,0.10);
  margin-left: 8px;
  padding-left: 6px;
  margin-bottom: 6px;
}

#gradient-stops {
  display: flex;
  gap: 3px;
  flex-wrap: wrap;
  margin-bottom: 0;
  min-width: 0;
}

.grad-stop {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  border: 2px solid var(--border-light);
  border-radius: 3px;
  cursor: pointer;
  padding: 0;
  transition: border-color 0.1s, transform 0.08s;
}
.grad-stop::-webkit-color-swatch-wrapper { padding: 0; }
.grad-stop::-webkit-color-swatch { border: none; border-radius: 2px; }
.grad-stop::-moz-color-swatch { border: none; }
.grad-stop:hover {
  border-color: rgba(255,255,255,0.5);
  transform: scale(1.1);
}

.grad-stop.active {
  border-color: #fff;
  box-shadow: 0 0 4px rgba(255,255,255,0.3);
}

#gradient-tools {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 0;
  align-self: start;
}
#gradient-tools button {
  width: 24px;
  height: 20px;
  font-size: 14px;
  line-height: 1;
  border: 1px solid var(--border);
  border-radius: 2px;
  background: var(--bg-input);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.1s, color 0.1s;
}
#gradient-tools button:hover {
  background: var(--accent);
  color: #fff;
}

/* ── Gradient preview bar ── */
#gradient-preview {
  grid-column: 1 / -1;
  margin-top: 2px;
}
#gradient-bar {
  height: 8px;
  border-radius: 4px;
  border: 1px solid var(--border);
}

/* ── BG color presets ── */
#bg-presets {
  display: flex;
  gap: 4px;
  align-items: center;
}

.bg-swatch {
  width: 18px;
  height: 18px;
  border: 1px solid var(--border-light);
  border-radius: 2px;
  cursor: pointer;
  flex-shrink: 0;
  transition: transform 0.08s, border-color 0.08s;
}

.bg-swatch:hover {
  transform: scale(1.15);
  border-color: var(--accent);
  z-index: 1;
  position: relative;
}

.bg-swatch.active {
  border-color: #fff;
  box-shadow: 0 0 4px rgba(255,255,255,0.4);
}

.bg-swatch.checker {
  background-image:
    linear-gradient(45deg, #999 25%, transparent 25%),
    linear-gradient(-45deg, #999 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #999 75%),
    linear-gradient(-45deg, transparent 75%, #999 75%);
  background-size: 6px 6px;
  background-position: 0 0, 0 3px, 3px -3px, -3px 0px;
  background-color: #ddd;
}

/* ── Center emitter button in canvas footer ── */
#btn-center-emitter {
  font-size: 10px;
  padding: 2px 8px;
  line-height: 1.4;
}

/* ── Gradient hint text ── */


/* ── Gradient pickers rows (inline inside Color section) ── */
#gradient-start-row,
#gradient-end-row,
#effect-strength-row {
  margin-top: 4px;
}

/* ── Export section sub-labels ── */
.export-sub-label {
  font-size: 9px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin: 6px 0 4px;
}

/* ============================================================
   CANVAS AREA — the main center stage
   ============================================================ */
#canvas-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--bg-app);
  gap: 10px;
  min-width: 0;
  overflow: hidden;
  /* Subtle dot-grid background — gives depth without competing with particles */
  background-image: radial-gradient(circle, #1e1e28 1px, transparent 1px);
  background-size: 24px 24px;
}

#canvas-wrap {
  position: relative;
  /* Layered border: inner solid + outer glow ring */
  border: 1px solid var(--border-light);
  box-shadow:
    0 0 0 1px var(--border),
    0 0 24px rgba(0, 0, 0, 0.8),
    0 0 48px rgba(123, 94, 167, 0.08);
  /* Let the canvas element define the size; wrap fits tightly around it */
  line-height: 0;
  transition: box-shadow 0.3s;
}

/* Subtle accent glow when animation is running */
#canvas-wrap.running {
  box-shadow:
    0 0 0 1px var(--border),
    0 0 24px rgba(0, 0, 0, 0.6),
    0 0 60px rgba(123, 94, 167, 0.18);
}

#preview-canvas {
  display: block;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

#canvas-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.5);
  font-family: var(--font-mono);
  font-size: 16px;
  letter-spacing: 8px;
  color: rgba(255, 255, 255, 0.35);
  pointer-events: none;
}

#copy-toast {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(20, 20, 30, 0.92);
  border: 1px solid rgba(255,255,255,0.15);
  color: #aaffaa;
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 4px 14px;
  border-radius: 20px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.18s ease;
  white-space: nowrap;
  z-index: 10;
}

#copy-toast.show { opacity: 1; }

#canvas-footer {
  display: flex;
  gap: 20px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-secondary);
  letter-spacing: 0.3px;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
}

/* ============================================================
   MODALS (shared)
   ============================================================ */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 350;
  backdrop-filter: blur(4px);
}

.modal-box {
  background: var(--bg-panel);
  border: 1px solid var(--border-light);
  border-radius: 4px;
  padding: 24px 28px;
  min-width: 340px;
  max-width: 92vw;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.85), 0 0 40px rgba(123, 94, 167, 0.1);
}

.modal-box h2 {
  font-size: 13px;
  font-family: var(--font-mono);
  letter-spacing: 1px;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.export-actions { display: flex; gap: 8px; }

/* ============================================================
   RENDER RESULT MODAL
   ============================================================ */
.render-modal-box {
  min-width: 380px;
  max-width: 520px;
  width: 90vw;
}

/* ── Progress phase ── */
#render-progress-wrap,
#render-encode-wrap {
  height: 4px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 10px;
}

#render-progress-bar,
#render-encode-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  width: 0%;
  transition: width 0.08s;
  border-radius: 2px;
}

#render-status,
#render-encode-status {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

/* ── Preview canvas ── */
#render-preview-wrap {
  display: flex;
  justify-content: center;
  align-items: center;
  background: #000;
  border: 1px solid var(--border-light);
  border-radius: 3px;
  margin-bottom: 8px;
  overflow: hidden;
  min-height: 128px;
}

#render-preview-canvas {
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  max-width: 100%;
  max-height: 320px;
}

/* ── Info bar ── */
#render-info {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-secondary);
  margin-bottom: 8px;
  padding: 0 2px;
}

/* ── Playback controls ── */
#render-playback {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 8px 10px;
  margin-bottom: 10px;
}

#render-transport {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 6px;
}

#render-transport .btn-sm {
  font-size: 10px;
  padding: 2px 8px;
  min-width: 28px;
  line-height: 1.4;
  background: var(--bg-panel);
  border: 1px solid var(--border-light);
  color: var(--text-primary);
  border-radius: 3px;
  cursor: pointer;
}

#render-transport .btn-sm:hover {
  background: var(--border);
}

#render-scrubber {
  flex: 1;
  height: 4px;
  accent-color: var(--accent);
}

#render-frame-num {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-secondary);
  min-width: 60px;
  text-align: right;
}

#render-transport-row2 {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-label);
}

#render-transport-row2 label {
  display: flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
}

#render-speed {
  width: 60px;
  height: 3px;
  accent-color: var(--accent);
}

#render-speed-val {
  min-width: 28px;
}

/* ── Export panel ── */
#render-export-panel {
  margin-bottom: 10px;
}

#render-export-row {
  display: flex;
  gap: 6px;
  margin-bottom: 6px;
}

#render-export-format {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 11px;
  background: var(--bg-input);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 4px 6px;
}

#render-sheet-opts,
#render-gif-opts {
  padding-left: 4px;
  border-left: 2px solid rgba(255,255,255,0.08);
  margin-left: 4px;
  margin-top: 4px;
}

.ctrl-row.compact { margin-bottom: 2px; }
.ctrl-row.compact span { font-size: 10px; }

/* ── Encode progress (GIF/ZIP) ── */
#render-encode-progress {
  margin-bottom: 8px;
}

/* ============================================================
   SHORTCUTS MODAL
   ============================================================ */
.shortcuts-box {
  min-width: 280px;
  max-width: 380px;
}

.shortcuts-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 12px;
  align-items: center;
  margin-top: 12px;
}

kbd {
  font-family: var(--font-mono);
  font-size: 10px;
  background: var(--bg-input);
  border: 1px solid var(--border-light);
  border-bottom-width: 2px;
  border-radius: 3px;
  padding: 2px 6px;
  color: var(--text-primary);
  white-space: nowrap;
  text-align: center;
}

.shortcuts-grid span {
  font-size: 11px;
  color: var(--text-label);
}



/* ── Spritesheet preview in render modal ── */
#spritesheet-preview-wrap {
  margin: 8px 0;
  text-align: center;
}

#spritesheet-preview-img {
  max-width: 100%;
  max-height: 200px;
  border: 1px solid var(--border-light);
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  background: #000;
}

/* ── Export hints ── */
.export-hint {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-secondary);
  margin: 4px 0 0 4px;
  padding-left: 4px;
  border-left: 2px solid rgba(255,255,255,0.08);
}

/* ── Frame guide overlay on main canvas ── */
.frame-guide-rect {
  stroke: rgba(255, 255, 255, 0.35);
  stroke-width: 1;
  stroke-dasharray: 4 3;
  fill: none;
  pointer-events: none;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

/* Narrow desktop windows: slim the side panels instead of hiding them */
@media (max-width: 1240px) and (min-width: 1001px) {
  :root { --panel-w: 190px; }
}

/* ── Phones & small tablets: single scrollable column ──────────────────
   v3: hamburger→bottom-sheet presets, big touch chrome, inset cards. */
@media (max-width: 1000px), ((pointer: coarse) and (max-width: 1680px)) {
  :root { --topbar-h: 66px; }

  html, body { height: auto; overflow: visible; }
  body { font-size: 16px; }

  #app {
    height: auto;
    min-height: 100dvh;
  }

  /* Top bar: compact buttons wrapping into two tidy rows — nothing
     hidden, nothing to swipe. Keys is desktop-only. */
  #topbar {
    position: sticky;
    top: 0;
    z-index: 130;
    height: auto;
    min-height: 0;
    flex-wrap: wrap;
    padding: 8px 10px;
    gap: 6px;
    row-gap: 6px;
  }
  #topbar-controls { display: contents; }
  #topbar .btn {
    flex: 1 1 auto;
    justify-content: center;
    text-align: center;
    padding: 11px 7px;
    font-size: 12.5px;
  }
  #topbar .btn-glyph { display: none; }
  #topbar .btn-icon { flex-grow: 0; padding: 11px 13px; }
  #topbar .btn-icon svg { width: 18px; height: 18px; }
  #logo { flex: 0 0 auto; }
  .logo-name { display: none; }
  /* Row 1: transport + history + dice. Row 2: render + file ops + presets. */
  #logo { order: 1; }
  #btn-play, #btn-pause { order: 2; }
  #btn-reset { order: 3; }
  #btn-undo { order: 4; }
  #btn-redo { order: 5; }
  #btn-rand-top { order: 6; }
  #btn-render-top { order: 7; }
  #btn-save-cfg { order: 8; }
  #topbar-controls label.btn { order: 9; }
  #btn-share { order: 10; }
  #btn-presets-sheet { order: 11; }
  #topbar-credit { display: none; }
  #btn-shortcuts { display: none; }
  #topbar .topbar-sep { display: none; }
  .mobile-only { display: inline-flex; }

  /* The desktop preset strip is replaced by the ☰ Presets bottom sheet */
  #preset-bar { display: none; }

  /* Main becomes a column; the canvas moves to the top and sticks */
  #main {
    flex-direction: column;
    overflow: visible;
    flex: none;
    background: var(--bg-app);
  }

  #canvas-area {
    order: -1;
    position: sticky;
    top: var(--topbar-actual, var(--topbar-h));
    z-index: 120;
    flex: none;
    padding: 10px 0 8px;
    gap: 8px;
    border-bottom: 1px solid var(--border-light);
    background-color: var(--bg-app);
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.45);
  }

  #canvas-footer { font-size: 13px; gap: 16px; }
  #btn-center-emitter { padding: 12px 18px; font-size: 14px; }

  /* Panels: transparent page, groups become inset cards */
  #panel-left,
  #panel-right {
    width: 100%;
    overflow: visible;
    border: none;
    background: transparent;
    padding: 6px 0;
  }
  #panel-right { padding-bottom: 32px; }

  .ctrl-group {
    background: var(--bg-panel);
    border: 1px solid var(--border-light);
    border-radius: 14px;
    margin: 12px 16px;
    padding: 16px 16px 18px;
  }
  .ctrl-group:last-child { border-bottom: 1px solid var(--border-light); }

  .group-label {
    font-size: 13px;
    letter-spacing: 2px;
    color: var(--accent);
    margin-bottom: 14px;
  }

  /* Big, comfortable controls */
  .btn { padding: 14px 18px; font-size: 15px; }
  .btn-sm { padding: 11px 15px; font-size: 14px; }
  .btn-icon { padding: 14px 15px; }
  .btn-icon svg { width: 22px; height: 22px; }

  .ctrl-row { min-height: 52px; font-size: 16px; gap: 12px; }
  .ctrl-row > span { font-size: 15px; }
  .val-display { font-size: 14px; min-width: 50px; }

  /* 16px font on form controls prevents iOS auto-zoom on focus */
  select { min-height: 48px; font-size: 16px; padding: 10px 14px; }
  #preset-name-input { font-size: 16px; }
  input[type="range"] { height: 12px; }
  input[type="range"]::-webkit-slider-thumb { width: 32px; height: 32px; border-radius: 8px; }
  input[type="checkbox"].toggle { transform: scale(1.6); transform-origin: right center; }
  input[type="color"] { min-width: 52px; min-height: 42px; }

  /* Color pickers: real tap targets */
  #palette-grid .pal-swatch { width: 42px; height: 42px; }
  #gradient-stops .grad-stop { width: 42px; height: 42px; }
  .bg-swatch { width: 32px; height: 32px; }
  #palette-presets {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    margin-top: 10px;
  }
  #palette-presets .preset-btn {
    padding: 14px 6px;
    font-size: 13px;
    border-radius: 8px;
  }

  /* Modals: fit the screen, scroll internally */
  .modal-box {
    min-width: 0;
    width: 94vw;
    max-height: 88dvh;
    overflow-y: auto;
    padding: 16px;
  }
  #render-preview-canvas,
  #spritesheet-preview-img {
    max-width: 100%;
    height: auto;
    image-rendering: pixelated;
  }

  /* No hover states on touch */
  #app-credit a:hover { text-decoration: none; }
}

/* ── Death sparks sub-controls (indented under death-count slider) ── */
/* Mobile layout pass: compact command bar, smaller sticky stage, denser cards. */
@media (max-width: 1000px), ((pointer: coarse) and (max-width: 1680px)) {
  :root {
    --topbar-h: 54px;
    --mobile-pad: 10px;
  }

  html,
  body {
    width: 100%;
    overflow-x: hidden;
  }

  * { -webkit-tap-highlight-color: transparent; }

  #topbar,
  #canvas-footer,
  #panel-left,
  #panel-right {
    -webkit-user-select: none;
    user-select: none;
  }

  /* Vertical swipes over a slider scroll the page; horizontal input still
     reaches the slider (with the JS thumb guard filtering track taps). */
  input[type="range"] { touch-action: pan-y; }

  body {
    font-size: 14px;
  }

  #app {
    min-height: 100dvh;
    overflow-x: hidden;
    padding-bottom: calc(18px + env(safe-area-inset-bottom, 0px));
  }

  #topbar {
    width: 100%;
    max-width: 100vw;
    height: var(--topbar-h);
    min-height: var(--topbar-h);
    flex-wrap: nowrap;
    align-items: center;
    padding: 7px 6px;
    gap: 4px;
    overflow: hidden;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.26);
  }

  #logo {
    order: 1;
    align-items: center;
    gap: 4px;
    margin-right: 0;
  }

  .logo-px {
    font-size: 12px;
    padding: 3px 5px;
  }

  .logo-name {
    display: none;
  }

  .logo-version {
    display: inline-block;
    font-size: 10px;
    padding: 3px 4px;
  }

  #topbar-controls {
    order: 2;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 2px;
    min-width: 0;
    flex: 1 1 0;
    overflow: hidden;
  }

  #topbar .topbar-sep,
  #topbar-credit,
  #btn-shortcuts,
  #btn-render-top,
  #btn-save-cfg,
  #topbar-controls > label.btn {
    display: none !important;
  }

  .mobile-only {
    display: inline-flex;
  }

  #topbar .btn {
    min-width: 0;
    height: 36px;
    min-height: 36px;
    padding: 0 8px;
    border-radius: 5px;
    font-size: 12px;
    flex: 0 1 auto;
  }

  #topbar #btn-play,
  #topbar #btn-pause {
    order: 1;
    width: 34px;
    flex: 0 0 34px;
    gap: 0;
  }

  #topbar .btn-label {
    display: none;
  }

  #topbar #btn-reset {
    order: 2;
    width: 34px;
    flex: 0 0 34px;
    gap: 0;
  }

  #topbar #btn-undo {
    order: 3;
    width: 34px;
    flex: 0 0 34px;
  }

  #topbar #btn-redo {
    order: 4;
    width: 34px;
    flex: 0 0 34px;
  }

  #topbar #btn-rand-top {
    order: 5;
    width: 34px;
    flex: 0 0 34px;
    padding: 0;
    color: #fff;
    background: linear-gradient(135deg, var(--accent), #5a3fa0);
    border-color: var(--accent-hover);
    box-shadow: 0 0 8px var(--accent-glow);
  }

  #topbar #btn-share {
    order: 6;
    width: 34px;
    flex: 0 0 34px;
    padding: 0;
    gap: 0;
  }

  #btn-render-top {
    order: 7;
  }

  #btn-presets-sheet {
    order: 8;
  }

  #topbar #btn-mobile-actions {
    order: 9;
  }

  #btn-mobile-actions {
    width: 34px;
    flex: 0 0 34px;
    padding: 0;
  }

  #topbar #btn-presets-sheet {
    width: 56px;
    flex: 0 0 56px;
    padding: 0 5px;
    font-size: 11px;
    font-weight: 600;
  }

  #btn-mobile-actions svg {
    width: 18px;
    height: 18px;
  }

  #topbar .btn-symbol {
    width: 17px;
    height: 17px;
    stroke-width: 2.25;
  }

  #topbar #btn-share.is-copied .btn-symbol,
  #topbar #btn-share.is-copied .btn-label {
    display: none;
  }

  #topbar #btn-share.is-copied::before {
    content: "\2713";
    color: #aaffaa;
    font-size: 17px;
    line-height: 1;
  }

  #preset-bar {
    display: none;
  }

  #main {
    flex-direction: column;
    overflow: visible;
    flex: none;
    width: 100%;
    max-width: 100vw;
    background: var(--bg-app);
  }

  #canvas-area {
    order: -1;
    position: sticky;
    top: var(--topbar-actual, var(--topbar-h));
    z-index: 120;
    flex: none;
    width: 100%;
    max-width: 100vw;
    padding: 8px var(--mobile-pad) 7px;
    gap: 7px;
    border-bottom: 1px solid var(--border);
    background-color: var(--bg-app);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.38);
  }

  #canvas-wrap {
    max-width: calc(100vw - (var(--mobile-pad) * 2));
  }

  #preview-canvas {
    max-width: 100%;
    touch-action: none;
  }

  #canvas-footer {
    /* Exactly as wide as the canvas itself, so fps sits on its left edge
       and Center on its right — not the screen's edges */
    width: var(--canvas-display, min(calc(100vw - (var(--mobile-pad) * 2)), 380px));
    max-width: calc(100vw - (var(--mobile-pad) * 2));
    display: flex;
    flex-wrap: nowrap;
    justify-content: flex-start;
    align-items: center;
    gap: 12px;
    font-size: 12px;
    letter-spacing: 0;
    line-height: 1.2;
  }

  #fps-display,
  #particle-count-live {
    min-width: 0;
    white-space: nowrap;
  }

  #emitter-pos-display { display: none; }

  #btn-center-emitter {
    min-height: 34px;
    padding: 0 12px;
    border-radius: 6px;
    font-size: 12px;
    margin-left: auto;
    flex: 0 0 auto;
  }

  #panel-left,
  #panel-right {
    width: 100%;
    max-width: 100vw;
    overflow: visible;
    border: none;
    background: transparent;
    padding: 0;
  }

  #panel-left { padding-top: 8px; }

  /* #main is a flex column, so card margins can't collapse across the two
     panels — drop one side or the Lifetime->Color seam doubles to 16px */
  #panel-right .ctrl-group:first-child { margin-top: 0; }

  #panel-right {
    padding-bottom: calc(20px + env(safe-area-inset-bottom, 0px));
  }

  #mobile-footer-credit {
    display: block;
    margin: 8px 16px 26px;
    color: var(--text-secondary);
    font-size: 11px;
    text-align: center;
  }

  #mobile-footer-credit a {
    color: var(--accent-hover);
    text-decoration: none;
  }

  #footer-version {
    color: var(--accent-hover);
    cursor: pointer;
  }

  .ctrl-group {
    margin: 8px var(--mobile-pad);
    padding: 11px 12px;
    border: 1px solid var(--border-light);
    border-radius: 8px;
    background: rgba(20, 20, 26, 0.96);
  }

  .ctrl-group:last-child {
    border-bottom: 1px solid var(--border-light);
  }

  .group-label {
    margin-bottom: 10px;
    padding: 2px 0 6px;
    color: var(--accent-hover);
    font-size: 11px;
    letter-spacing: 1.4px;
  }

  .btn {
    min-height: 42px;
    padding: 11px 14px;
    border-radius: 6px;
    font-size: 14px;
  }

  .btn-sm {
    min-height: 36px;
    padding: 8px 11px;
    border-radius: 6px;
    font-size: 13px;
  }

  .btn-icon {
    padding: 10px 12px;
  }

  .ctrl-row {
    min-height: 40px;
    gap: 10px;
    margin-bottom: 6px;
    font-size: 14px;
  }

  .ctrl-row > span {
    min-width: 88px;
    font-size: 13px;
  }

  .slider-pair {
    gap: 8px;
  }

  .val-display {
    min-width: 44px;
    font-size: 12px;
  }

  select {
    min-width: 0;
    min-height: 38px;
    padding: 8px 10px;
    border-radius: 6px;
    font-size: 16px;
  }

  #preset-name-input {
    font-size: 16px;
  }

  input[type="range"] {
    height: 10px;
  }

  input[type="range"]::-webkit-slider-thumb {
    width: 26px;
    height: 26px;
    border-radius: 6px;
  }

  input[type="checkbox"].toggle {
    transform: scale(1.35);
    transform-origin: right center;
  }

  input[type="color"] {
    min-width: 44px;
    min-height: 36px;
  }

  .seg-btn {
    padding: 9px 10px;
    font-size: 11px;
  }

  #palette-grid .pal-swatch,
  #gradient-stops .grad-stop {
    width: 36px;
    height: 36px;
  }

  .bg-swatch {
    width: 28px;
    height: 28px;
  }

  #palette-presets {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px;
    margin-top: 8px;
  }

  #palette-presets .preset-btn {
    padding: 10px 4px;
    border-radius: 6px;
    font-size: 11px;
  }

  .sheet-panel {
    max-height: 76dvh;
    padding: 6px 14px calc(18px + env(safe-area-inset-bottom, 0px));
  }

  .sheet-actions {
    justify-content: center;
    gap: 8px;
    margin-bottom: 12px;
  }

  .sheet-actions .btn {
    width: min(100%, 280px);
  }

  .sheet-actions .btn,
  .action-sheet-grid .btn {
    min-height: 44px;
    padding: 12px 8px;
    font-size: 14px;
  }

  #sheet-preset-grid {
    gap: 8px;
  }

  #sheet-preset-grid .sheet-preset {
    padding: 12px 6px;
    font-size: 14px;
  }

  .modal-box {
    min-width: 0;
    width: min(94vw, 520px);
    max-height: 88dvh;
    overflow-y: auto;
    padding: 16px;
  }
}

@media (max-width: 380px) {
  #topbar {
    padding-inline: 4px;
    gap: 3px;
  }

  #topbar-controls {
    gap: 2px;
  }

  #topbar #btn-play,
  #topbar #btn-pause {
    width: 32px;
    flex-basis: 32px;
  }

  #topbar #btn-reset {
    width: 32px;
    flex-basis: 32px;
  }

  #topbar #btn-undo,
  #topbar #btn-redo,
  #topbar #btn-rand-top,
  #topbar #btn-share,
  #topbar #btn-mobile-actions {
    width: 32px;
    flex-basis: 32px;
  }

  #topbar #btn-presets-sheet {
    width: 52px;
    flex-basis: 52px;
    padding: 0 4px;
    font-size: 10.5px;
  }

  /* 360px-wide phones: whole logo yields — every px goes to the buttons.
     The version (and its patch-notes tap target) lives in the footer. */
  #logo { display: none; }
  #topbar-controls { justify-content: center; }
}

#death-params-row,
#effect-params-row {
  border-left: 2px solid rgba(255,255,255,0.10);
  margin-left: 8px;
  margin-bottom: 6px;
  padding-left: 6px;
}

#shadow-color-row {
  margin-top: 4px;
}

/* ── Emitter shape size/angle sub-controls ── */
#emitter-size-row,
#emitter-angle-row,
#emitter-arc-row,
#burst-row,
#pulse-interval-row {
  border-left: 2px solid rgba(255,255,255,0.10);
  margin-left: 8px;
  margin-bottom: 6px;
  padding-left: 6px;
}


/* ── Name Preset Modal ── */
.name-preset-box {
  max-width: 320px;
  padding: 20px 24px;
  text-align: center;
}
.name-preset-box h3 {
  margin: 0 0 12px;
  font-size: 14px;
  font-family: var(--font-ui);
  color: var(--text-primary);
}
#preset-name-input {
  width: 100%;
  padding: 8px 10px;
  font-size: 13px;
  font-family: var(--font-ui);
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  outline: none;
  box-sizing: border-box;
}
#preset-name-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 4px var(--accent-glow);
}
.name-preset-btns {
  display: flex;
  gap: 8px;
  margin-top: 14px;
  justify-content: center;
}
.name-preset-btns .btn {
  flex: 1;
  padding: 6px 0;
}


/* ── App credit (top bar, far right) ─────────────────────────────────── */
#topbar-credit {
  margin-left: auto;
  font-size: 11px;
  color: #666;
  white-space: nowrap;
}
#topbar-credit a {
  color: #8a7fd4;
  text-decoration: none;
}
#topbar-credit a:hover { text-decoration: underline; }

/* ── Small-screen notice ─────────────────────────────────────────────── */
#mobile-notice {
  position: fixed;
  left: 12px;
  right: 12px;
  bottom: 12px;
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 14px;
  background: #1a1730;
  border: 1px solid #3a3560;
  border-radius: 8px;
  font-size: 13px;
  color: #cfcae8;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.5);
}
#mobile-notice.hidden { display: none; }