/* ==========================================================================
   Polyrhythmic Metronome — Professional DAW Dark Theme
   ========================================================================== */

:root {
  --bg-darkest: #0a0b0e;
  --bg-main: #12141a;
  --bg-card: #181b24;
  --bg-card-hover: #1f232e;
  --bg-input: #0e1017;
  --border-subtle: #252a36;
  --border-active: #3a4256;

  --accent-cyan: #00d2ff;
  --accent-cyan-glow: rgba(0, 210, 255, 0.35);
  --accent-orange: #ff5e36;
  --accent-orange-glow: rgba(255, 94, 54, 0.4);
  --accent-emerald: #00e676;
  --accent-emerald-glow: rgba(0, 230, 118, 0.35);
  --accent-purple: #b388ff;
  --accent-yellow: #ffd600;

  --text-primary: #f0f3fa;
  --text-secondary: #9aa3b8;
  --text-muted: #5e677c;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Consolas, "Liberation Mono", Menlo, monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

body {
  background-color: var(--bg-darkest);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
  padding-left: env(safe-area-inset-left, 0px);
  padding-right: env(safe-area-inset-right, 0px);
}

button, .subdiv-cell, .tap-btn, .step-btn {
  touch-action: manipulation;
}

/* App Header */
.app-header {
  background: var(--bg-main);
  border-bottom: 1px solid var(--border-subtle);
  padding: 12px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-orange));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 18px;
  color: #000;
  box-shadow: 0 0 15px var(--accent-cyan-glow);
}

.brand-titles h1 {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--text-primary);
}

.brand-titles p {
  font-size: 11px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.header-actions {
  display: flex;
  gap: 10px;
}

/* Primary buttons */
.btn {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 8px 14px;
  font-size: 13px;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s ease;
  user-select: none;
}

.btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-active);
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--accent-cyan);
  border-color: var(--accent-cyan);
  color: #000;
}

.btn-primary:hover {
  background: #33ddff;
  box-shadow: 0 0 12px var(--accent-cyan-glow);
}

.btn-accent {
  background: var(--accent-orange);
  border-color: var(--accent-orange);
  color: #fff;
}

.btn-accent:hover {
  background: #ff7552;
  box-shadow: 0 0 12px var(--accent-orange-glow);
}

.btn-sm {
  padding: 4px 8px;
  font-size: 11px;
}

/* Master Transport Bar */
.transport-bar {
  background: var(--bg-main);
  border-bottom: 1px solid var(--border-subtle);
  padding: 16px 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

/* Core transport controls (Play/Pause/Stop/Reset) stay reachable while the
   page auto-scrolls the playhead into view — on mobile and desktop.
   `top: 60px` sits just under the ~65px sticky app header: the bar tucks a
   few px beneath it (same opaque background) instead of leaving a gap.
   BPM lives in the sibling .bpm-bar and keeps scrolling with the page. */
.transport-controls-bar {
  position: sticky;
  top: 60px;
  z-index: 90;
}

/* Keep the BPM card on the right, where it sits in the original single bar */
.bpm-bar {
  justify-content: flex-end;
}

.transport-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.transport-btn {
  width: 52px;
  height: 52px;
  border-radius: 10px;
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
}

.transport-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-active);
}

.transport-btn.play-btn {
  background: #113622;
  border-color: var(--accent-emerald);
  color: var(--accent-emerald);
}

.transport-btn.play-btn.active {
  background: var(--accent-emerald);
  color: #000;
  box-shadow: 0 0 20px var(--accent-emerald-glow);
}

.transport-btn.pause-btn.active {
  background: var(--accent-yellow);
  border-color: var(--accent-yellow);
  color: #000;
}

.transport-btn.stop-btn:hover {
  color: var(--accent-orange);
  border-color: var(--accent-orange);
}

/* BPM Controls */
.bpm-container {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--bg-card);
  padding: 8px 16px;
  border-radius: 10px;
  border: 1px solid var(--border-subtle);
}

.bpm-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 1px;
}

.bpm-value-wrap {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.bpm-input {
  width: 80px;
  background: transparent;
  border: none;
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 800;
  color: var(--accent-cyan);
  text-align: right;
  outline: none;
}

.bpm-steppers {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.bpm-container .bpm-slider {
  width: 120px;
}

.step-btn-group {
  display: flex;
  gap: 4px;
}

.step-btn {
  width: 28px;
  height: 22px;
  background: var(--bg-darkest);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 11px;
  border-radius: 4px;
  cursor: pointer;
}

.step-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--border-active);
}

.tap-btn {
  height: 48px;
  padding: 0 18px;
  border-radius: 8px;
  background: var(--bg-darkest);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 1px;
  transition: all 0.1s ease;
}

.tap-btn:hover {
  border-color: var(--accent-orange);
  color: var(--accent-orange);
}

.tap-btn.tapped {
  background: var(--accent-orange);
  color: #fff;
  box-shadow: 0 0 15px var(--accent-orange-glow);
}

.master-extras {
  display: flex;
  align-items: center;
  gap: 16px;
}

.shortcut-badge {
  font-size: 11px;
  font-family: var(--font-mono);
  background: var(--bg-darkest);
  border: 1px solid var(--border-subtle);
  padding: 4px 8px;
  border-radius: 4px;
  color: var(--text-muted);
}

/* Workspace Layout */
.workspace {
  flex: 1;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-width: 1600px;
  margin: 0 auto;
  width: 100%;
}

/* Layers Container */
.layers-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.layers-header h2 {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.layers-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Single Layer Card */
.layer-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
  transition: border-color 0.2s ease;
  position: relative;
}

.layer-card.muted {
  opacity: 0.6;
}

.layer-accent-bar {
  height: 3px;
  width: 100%;
}

.layer-main {
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Layer Top Controls */
.layer-header-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-subtle);
}

.layer-title-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.layer-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
}

.layer-name-input {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 14px;
  border-radius: 4px;
  padding: 2px 6px;
  width: 130px;
}

.layer-name-input:focus {
  background: var(--bg-input);
  border-color: var(--border-active);
  outline: none;
}

/* Meter Input Section */
.meter-config {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-input);
  padding: 4px 10px;
  border-radius: 8px;
  border: 1px solid var(--border-subtle);
}

.meter-config label {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
}

.meter-num-input,
.meter-den-input {
  width: 58px;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 800;
  text-align: center;
  outline: none;
}

.meter-num-input:focus,
.meter-den-input:focus {
  color: var(--accent-cyan);
}

.meter-slash {
  color: var(--text-muted);
  font-size: 18px;
  font-weight: 300;
}

/* Layer Audio Settings */
.layer-audio-settings {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.control-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.control-label {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
}

.select-sound {
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-size: 12px;
  padding: 4px 8px;
  border-radius: 6px;
  outline: none;
  cursor: pointer;
}

.select-sound:focus {
  border-color: var(--accent-cyan);
}

.slider-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.slider-group input[type="range"] {
  width: 70px;
  height: 4px;
  accent-color: var(--accent-cyan);
  cursor: pointer;
}

.multiplier-input {
  width: 50px;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 3px 6px;
  border-radius: 4px;
  text-align: center;
}

.multiplier-input:focus {
  border-color: var(--accent-cyan);
  outline: none;
}

.layer-btn-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.mute-btn {
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 700;
  padding: 5px 10px;
  border-radius: 6px;
  cursor: pointer;
}

.mute-btn.active {
  background: #3b1812;
  border-color: var(--accent-orange);
  color: var(--accent-orange);
}

.del-layer-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  padding: 4px 8px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
}

.del-layer-btn:hover {
  background: #2a1416;
  color: #ff5252;
  border-color: #ff5252;
}

/* Grouping Bar */
.grouping-bar {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 10px 14px;
}

.grouping-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.grouping-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.grouping-title {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}

.grouping-sum-badge {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  background: #11281e;
  color: var(--accent-emerald);
  border: 1px solid var(--accent-emerald);
}

.grouping-sum-badge.error {
  background: #3b1812;
  color: #ff5252;
  border-color: #ff5252;
}

.grouping-quick-actions {
  display: flex;
  gap: 6px;
}

.groups-tags-container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  min-height: 36px;
}

.group-tag {
  display: inline-flex;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  overflow: hidden;
  transition: all 0.15s ease;
}

.group-tag:hover {
  border-color: var(--border-active);
}

.group-tag-val {
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  width: 38px;
  padding: 4px 6px;
  text-align: center;
  outline: none;
}

.group-tag-val:focus {
  color: var(--accent-cyan);
}

.group-tag-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 11px;
  padding: 4px 5px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.group-tag-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
}

.group-tag-del:hover {
  color: #ff5252;
}

.add-group-btn {
  background: transparent;
  border: 1px dashed var(--border-active);
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 6px;
  cursor: pointer;
}

.add-group-btn:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* Subdivision Grid Area */
.grid-container {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.grid-top-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.grid-legend {
  display: flex;
  gap: 14px;
  font-size: 11px;
  color: var(--text-muted);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

.legend-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.legend-dot.accent { background: var(--accent-orange); }
.legend-dot.normal { background: var(--accent-cyan); }
.legend-dot.mute { background: var(--text-muted); }

.grid-action-btns {
  display: flex;
  gap: 6px;
}

/* Scrollable Subdivision Cells */
.subdivision-scroll-wrap {
  overflow-x: auto;
  padding: 6px 2px 14px 2px;
  scrollbar-width: thin;
  scrollbar-color: var(--border-active) var(--bg-input);
}

.subdivision-scroll-wrap::-webkit-scrollbar {
  height: 6px;
}

.subdivision-scroll-wrap::-webkit-scrollbar-track {
  background: var(--bg-input);
  border-radius: 3px;
}

.subdivision-scroll-wrap::-webkit-scrollbar-thumb {
  background: var(--border-active);
  border-radius: 3px;
}

.subdivision-grid {
  display: flex;
  align-items: flex-start;
  gap: 2px;
  min-width: max-content;
}

.subdiv-cell-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.subdiv-cell-wrap.group-start {
  margin-left: 8px;
  position: relative;
}

.subdiv-cell-wrap.group-start::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border-active);
  border-radius: 1px;
}

.subdiv-cell {
  width: 32px;
  height: 38px;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  user-select: none;
  transition: all 0.08s ease;
  position: relative;
}

.subdiv-cell:hover {
  border-color: var(--border-active);
  transform: translateY(-1px);
}

.subdiv-cell.accent {
  background: #361712;
  border-color: var(--accent-orange);
}

.subdiv-cell.accent .cell-icon {
  color: var(--accent-orange);
  font-size: 15px;
}

.subdiv-cell.normal {
  background: #102630;
  border-color: #1b495c;
}

.subdiv-cell.normal .cell-icon {
  color: var(--accent-cyan);
  font-size: 13px;
}

.subdiv-cell.mute {
  background: #14161f;
  border-color: #202430;
  opacity: 0.5;
}

.subdiv-cell.mute .cell-icon {
  color: var(--text-muted);
  font-size: 13px;
}

/* Playhead active highlight */
.subdiv-cell.active-playhead {
  background: #fff !important;
  border-color: #fff !important;
  box-shadow: 0 0 16px rgba(255, 255, 255, 0.9), 0 0 25px var(--accent-cyan);
  transform: scale(1.15);
  z-index: 10;
}

.subdiv-cell.active-playhead .cell-icon {
  color: #000 !important;
}

.cell-num {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-muted);
}

/* Presets & Share Section */
.presets-section {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 18px 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.presets-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.presets-header h3 {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
}

.preset-input-wrap {
  display: flex;
  gap: 8px;
}

.preset-name-input {
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-size: 13px;
  padding: 6px 12px;
  border-radius: 6px;
  outline: none;
  width: 220px;
}

.preset-name-input:focus {
  border-color: var(--accent-cyan);
}

.presets-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.preset-chip {
  display: inline-flex;
  align-items: center;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  overflow: hidden;
}

.preset-chip:hover {
  border-color: var(--border-active);
}

.preset-chip-load {
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 12px;
  font-weight: 600;
  padding: 6px 12px;
  cursor: pointer;
  text-align: left;
}

.preset-chip-load:hover {
  color: var(--accent-cyan);
}

.preset-chip-del {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 6px 8px;
  cursor: pointer;
  font-size: 12px;
}

.preset-chip-del:hover {
  color: #ff5252;
  background: #2a1416;
}

/* Toast Notification */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--bg-card);
  border: 1px solid var(--accent-cyan);
  color: var(--text-primary);
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 13px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.6);
  z-index: 1000;
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.2s ease;
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* Footer */
.app-footer {
  margin-top: auto;
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-main);
  padding: 12px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text-muted);
}

/* Responsive Breakpoints */
@media (max-width: 900px) {
  .transport-bar {
    padding: 12px 16px;
    gap: 12px;
  }
  .workspace {
    padding: 16px;
  }
  .bpm-container {
    width: 100%;
    justify-content: space-between;
  }
}

/* ==========================================================================
   Base guards (all breakpoints) — avoid horizontal overflow on any width
   ========================================================================== */
img, svg, video, canvas {
  max-width: 100%;
  height: auto;
}

/* Flex/grid children must be allowed to shrink below their content size,
   otherwise the Subdivision Grid forces the whole card wider than the screen. */
.workspace,
.transport-bar,
.app-header,
.layer-card,
.layer-main,
.layer-header-bar,
.layer-audio-settings,
.grid-container,
.grouping-bar,
.presets-section,
.presets-header,
.subdivision-scroll-wrap {
  min-width: 0;
  max-width: 100%;
}

/* ==========================================================================
   Mobile / Touch layout — phones in portrait (360 – 430 px)
   Desktop layout above is intentionally left untouched.
   ========================================================================== */
@media (max-width: 640px) {
  html {
    -webkit-text-size-adjust: 100%;
  }

  body {
    overflow-x: hidden;
    /* `clip` does not create a scroll container (and does not force
       overflow-y to `auto`), so the sticky transport bar always resolves
       its scrollport against the viewport. Older engines ignore this line
       and fall back to `hidden` above. */
    overflow-x: clip;
    -webkit-tap-highlight-color: transparent;
    line-height: 1.45;
  }

  /* ---- Header: stacked, scrolls away (frees ~100px for the controls) ---- */
  .app-header {
    position: static;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    padding: 10px 12px;
  }

  .brand {
    gap: 9px;
    min-width: 0;
  }

  .brand-icon {
    width: 28px;
    height: 28px;
    font-size: 15px;
    border-radius: 7px;
    flex-shrink: 0;
  }

  .brand-titles {
    min-width: 0;
  }

  .brand-titles h1 {
    font-size: 13px;
    letter-spacing: 0.3px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .brand-titles p {
    font-size: 10px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .header-actions {
    gap: 8px;
    width: 100%;
  }

  .header-actions .btn {
    flex: 1;
    justify-content: center;
    min-height: 44px;
    padding: 8px 10px;
    font-size: 13px;
    white-space: nowrap;
  }

  /* ---- Transport: single column, big touch targets ---- */
  .transport-bar {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
    padding: 12px;
  }

  /* Header scrolls away on mobile, so the pinned controls start at the top */
  .transport-controls-bar {
    top: 0;
  }

  .transport-controls {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    width: 100%;
  }

  .transport-btn {
    width: 100%;
    height: 52px;
    font-size: 21px;
    border-radius: 12px;
  }

  /* Keyboard-shortcut hint is meaningless on a phone */
  .master-extras {
    display: none;
  }

  /* ---- BPM block: vertical stack (label row / steps / slider / tap) ---- */
  .bpm-container {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    width: 100%;
    padding: 12px;
    border-radius: 12px;
  }

  .bpm-container > div:first-child {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
  }

  .bpm-value-wrap {
    flex: 1;
    justify-content: flex-end;
  }

  .bpm-input {
    width: 92px;
    font-size: 34px;
    appearance: textfield;
    -moz-appearance: textfield;
  }

  .bpm-input::-webkit-outer-spin-button,
  .bpm-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
  }

  .bpm-steppers {
    width: 100%;
    gap: 6px;
  }

  .step-btn-group {
    width: 100%;
    gap: 6px;
  }

  .step-btn {
    flex: 1;
    width: auto;
    height: 44px;
    font-size: 14px;
    border-radius: 8px;
  }

  .bpm-container .bpm-slider {
    width: 100%;
    height: 28px;
    accent-color: var(--accent-cyan);
  }

  .tap-btn {
    width: 100%;
    height: 48px;
    font-size: 14px;
    border-radius: 10px;
  }

  /* ---- Workspace ---- */
  .workspace {
    padding: 14px 10px;
    gap: 14px;
  }

  .layers-header h2 {
    font-size: 13px;
  }

  .layer-main {
    padding: 14px 12px;
    gap: 14px;
  }

  .layer-header-bar {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
    padding-bottom: 14px;
  }

  .layer-title-group {
    width: 100%;
    gap: 8px;
  }

  .layer-tag {
    flex-shrink: 0;
    padding: 4px 8px;
  }

  .layer-name-input {
    flex: 1;
    width: auto;
    min-width: 0;
    font-size: 16px;           /* >=16px prevents focus-zoom on iOS */
    padding: 8px 8px;
    border-radius: 6px;
  }

  /* Time signature: full-width, easy to type into */
  .meter-config {
    width: 100%;
    justify-content: center;
    gap: 10px;
    padding: 8px 10px;
  }

  .meter-config label {
    font-size: 12px;
  }

  .meter-num-input,
  .meter-den-input {
    width: 76px;
    height: 46px;
    font-size: 24px;
    font-weight: 800;
  }

  .meter-slash {
    font-size: 22px;
  }

  /* Audio controls: 2-column touch grid */
  .layer-audio-settings {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    align-items: stretch;
  }

  .control-item {
    gap: 8px;
    background: var(--bg-input);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    padding: 6px 10px;
    min-height: 48px;
    justify-content: space-between;
  }

  /* 1 = sound select, 2 = volume, 3 = accent, 4 = multiplier, 5 = actions */
  .layer-audio-settings .control-item:nth-child(1) {
    grid-column: 1 / -1;
  }

  .control-label {
    font-size: 12px;
    flex-shrink: 0;
  }

  .select-sound {
    flex: 1;
    min-width: 0;
    min-height: 44px;
    font-size: 15px;
    padding: 6px 8px;
    border-radius: 6px;
  }

  .slider-group {
    flex: 1;
    justify-content: flex-end;
    min-width: 0;
  }

  .slider-group input[type="range"] {
    width: 100%;
    min-width: 60px;
    height: 32px;               /* larger thumb/hit area */
    accent-color: var(--accent-cyan);
  }

  .multiplier-input {
    width: 72px;
    min-height: 40px;
    font-size: 16px;
    padding: 6px;
  }

  .layer-btn-actions {
    justify-content: flex-end;
    gap: 8px;
    width: 100%;
  }

  .mute-btn {
    flex: 1;
    min-height: 44px;
    font-size: 13px;
    padding: 0 16px;
    border-radius: 8px;
  }

  .del-layer-btn {
    width: 44px;
    height: 44px;
    font-size: 16px;
    border: 1px solid var(--border-subtle);
  }

  /* ---- Grouping: touch-friendly editor ---- */
  .grouping-bar {
    padding: 12px;
    gap: 12px;
  }

  .grouping-top {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .grouping-info {
    flex-wrap: wrap;
    gap: 8px;
  }

  .grouping-title {
    font-size: 12px;
  }

  .grouping-quick-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  .grouping-quick-actions .btn {
    min-height: 44px;
    font-size: 13px;
    justify-content: center;
    padding: 6px 8px;
  }

  .groups-tags-container {
    gap: 8px;
    min-height: 44px;
  }

  .group-tag {
    min-height: 44px;
  }

  .group-tag-val {
    width: 52px;
    min-height: 44px;
    font-size: 16px;
    padding: 6px;
  }

  .group-tag-btn {
    min-width: 44px;
    min-height: 44px;
    font-size: 13px;
    padding: 4px 6px;
  }

  .add-group-btn {
    min-height: 44px;
    padding: 0 14px;
    font-size: 13px;
  }

  /* ---- Subdivision grid: readable cells + horizontal scroll ---- */
  .grid-container {
    width: 100%;
  }

  .grid-top-actions {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .grid-legend {
    flex-wrap: wrap;
    gap: 6px 12px;
    font-size: 11px;
    line-height: 1.6;
  }

  .grid-action-btns {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
  }

  .grid-action-btns .btn {
    min-height: 44px;
    justify-content: center;
    padding: 6px 4px;
    font-size: 12px;
    white-space: nowrap;
  }

  .subdivision-scroll-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-x: contain;
    padding: 6px 2px 16px 2px;
    /* keep the scroller inside the card even with many beats */
    width: 100%;
  }

  .subdivision-grid {
    gap: 4px;
    padding-right: 8px;
  }

  .subdiv-cell-wrap {
    gap: 5px;
  }

  .subdiv-cell-wrap.group-start {
    margin-left: 12px;
  }

  .subdiv-cell {
    width: 46px;                /* ~44px minimum finger target */
    height: 54px;
    border-radius: 8px;
  }

  .subdiv-cell .cell-icon {
    font-size: 18px;
  }

  .subdiv-cell.accent .cell-icon { font-size: 19px; }
  .subdiv-cell.normal .cell-icon { font-size: 17px; }
  .subdiv-cell.mute .cell-icon   { font-size: 17px; }

  .cell-num {
    font-size: 10px;
  }

  /* ---- Presets ---- */
  .presets-section {
    padding: 14px 12px;
    gap: 12px;
  }

  .presets-header {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .preset-input-wrap {
    flex-direction: column;
    gap: 8px;
    width: 100%;
  }

  .preset-name-input {
    width: 100%;
    font-size: 16px;
    padding: 12px;
    min-height: 46px;
  }

  .preset-input-wrap .btn {
    min-height: 46px;
    justify-content: center;
    font-size: 14px;
  }

  .presets-chips {
    gap: 8px;
  }

  .preset-chip-load {
    min-height: 44px;
    padding: 10px 14px;
    font-size: 13px;
    white-space: normal;
    text-align: left;
  }

  .preset-chip-del {
    min-width: 44px;
    min-height: 44px;
    font-size: 14px;
  }

  /* ---- Footer & toast ---- */
  .app-footer {
    flex-direction: column;
    align-items: center;
    gap: 4px;
    text-align: center;
    padding: 12px 12px calc(12px + env(safe-area-inset-bottom, 0px));
    font-size: 11px;
  }

  .toast {
    left: 12px;
    right: 12px;
    bottom: calc(14px + env(safe-area-inset-bottom, 0px));
    text-align: center;
    font-size: 13px;
  }

  /* ---- Keyboard open: keep layout stable, no double scrollbars ---- */
  .workspace,
  .transport-bar,
  .app-header,
  .app-footer {
    max-width: 100vw;
  }
}

/* ==========================================================================
   Extra tightening for narrow phones (360 px class)
   ========================================================================== */
@media (max-width: 400px) {
  .transport-bar {
    padding: 10px;
    gap: 10px;
  }

  .workspace {
    padding: 12px 8px;
  }

  .layer-main {
    padding: 12px 10px;
    gap: 12px;
  }

  .bpm-input {
    width: 84px;
    font-size: 30px;
  }

  .meter-num-input,
  .meter-den-input {
    width: 68px;
    height: 44px;
    font-size: 22px;
  }

  .subdiv-cell {
    width: 44px;
    height: 52px;
  }

  .grid-action-btns .btn {
    font-size: 11.5px;
    padding: 6px 2px;
  }

  .group-tag-val {
    width: 46px;
  }

  .brand-titles h1 {
    font-size: 12.5px;
  }
}

/* ==========================================================================
   Phone landscape / short viewports — keep everything on one screen height
   ========================================================================== */
@media (orientation: landscape) and (max-height: 520px) {
  .app-header {
    position: static;
    flex-direction: row;
    align-items: center;
    padding: 8px 12px;
  }

  /* Header scrolls away in short viewports too — pin controls at the top */
  .transport-controls-bar {
    top: 0;
  }

  .brand-titles p {
    display: none;
  }

  .header-actions {
    width: auto;
  }

  .header-actions .btn {
    flex: 0 0 auto;
    min-height: 40px;
  }

  .transport-btn {
    height: 46px;
  }

  .tap-btn {
    height: 44px;
  }

  .workspace {
    padding: 10px;
  }
}

/* ==========================================================================
   Safe area for notched phones (only when the WebView draws edge-to-edge)
   Scoped to mobile so the desktop layout stays byte-for-byte identical.
   ========================================================================== */
@media (max-width: 640px) {
  @supports (padding: env(safe-area-inset-top)) {
    .app-header {
      padding-top: calc(10px + env(safe-area-inset-top, 0px));
    }

    .app-footer {
      padding-bottom: calc(12px + env(safe-area-inset-bottom, 0px));
    }
  }
}

@media (max-width: 640px) and (orientation: landscape) {
  .app-header {
    padding-left: calc(12px + env(safe-area-inset-left, 0px));
    padding-right: calc(12px + env(safe-area-inset-right, 0px));
  }
}