/**
 * TR-08 Pattern Editor Styles
 *
 * Uses CSS custom properties for theming and scaling.
 * Grid layout for responsive pattern editor.
 */

/* ========================================
   Custom Properties (Theme)
   ======================================== */

:root {
  /* Colors - inspired by TR-08 hardware */
  --color-bg: #1a1a1a;
  --color-surface: #252525;
  --color-surface-raised: #2d2d2d;
  --color-border: #3a3a3a;

  --color-text: #e0e0e0;
  --color-text-muted: #888;
  --color-text-dim: #555;

  --color-accent: #ff6b35;
  --color-accent-dim: #8b3a1d;
  --color-step-on: #ff6b35;
  --color-step-off: #3a3a3a;
  --color-step-shadow: #5a3020;
  --color-step-shadow-hover: #6a3a28;
  --color-step-inactive: #2a2a2a;

  --color-playing: #4a9eff;

  /* Typography */
  --font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  --font-size-base: 14px;
  --font-size-small: 12px;
  --font-size-label: 11px;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;

  /* Grid dimensions - fixed size for all devices */
  --cell-size: 28px;
  --cell-height: 18px;
  --cell-gap: 2px;
  --label-width: 38px;

  /* Borders */
  --border-radius: 4px;
  --border-radius-sm: 2px;

  /* Transitions */
  --transition-fast: 100ms ease;
  --transition-normal: 200ms ease;
}

/* ========================================
   Base Styles
   ======================================== */

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

html {
  font-size: var(--font-size-base);
}

body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-family);
  line-height: 1.4;
  -webkit-font-smoothing: antialiased;
  height: 100vh;
  overflow: hidden;

  /* Prevent text selection and touch callouts on iPad/iOS */
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
}

/* Three-zone layout */
#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-height: 100vh;
  padding: var(--spacing-sm);
  gap: 4px;
  overflow: auto;
}

/* Mobile-first compact layout */
@media (max-width: 768px) {
  #app {
    padding: 4px;
    gap: 2px;
  }
}

/* ========================================
   Zone 1: Top Control Bar
   ======================================== */

.control-bar {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  background: var(--color-surface);
  border-radius: var(--border-radius);
  overflow-x: auto;
  flex-wrap: wrap;
}

.control-spacer {
  flex: 1;
  min-width: 8px;
}

/* Mode toggle in control bar */
.mode-toggle {
  display: flex;
  gap: 1px;
  background: #1a1a1a;
  border-radius: var(--border-radius-sm);
  padding: 1px;
}

.mode-btn {
  padding: 3px 8px;
  background: transparent;
  border: none;
  border-radius: calc(var(--border-radius-sm) - 1px);
  color: var(--color-text-muted);
  font-family: inherit;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: all var(--transition-fast);
  min-width: 28px;
}

.mode-btn:hover {
  color: var(--color-text);
  background: #2a2a2a;
}

.mode-btn.active {
  background: var(--color-accent);
  color: white;
}

/* Track number in control bar */
.control-bar .track-number-display {
  font-size: 11px;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 3px 6px;
  border-radius: var(--border-radius-sm);
  transition: opacity var(--transition-fast);
  user-select: none;
  white-space: nowrap;
  min-width: 16px;
  text-align: center;
  opacity: 0;
  pointer-events: none;
}

.control-bar .track-number-display.visible {
  opacity: 1;
  pointer-events: auto;
}

.control-bar .track-number-display.visible:hover {
  color: var(--color-text);
  background: rgba(255, 107, 53, 0.1);
}

/* Knobs in control bar */
.control-bar .tempo-knob-container,
.control-bar .shuffle-knob-container {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 4px;
}

.control-bar .tempo-knob-container .knob-label,
.control-bar .shuffle-knob-container .knob-label {
  order: -1;
  /* Put label before knob */
  font-size: 9px;
  writing-mode: horizontal-tb;
}

.control-bar .tempo-knob-container .knob {
  width: 50px;
  height: 50px;
}

.control-bar .shuffle-knob-container .knob {
  width: 40px;
  height: 40px;
}

/* Variation controls in control bar */
.control-bar .variation-control {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 6px;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
}

.control-bar .if-variation-control {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 6px;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
}

/* Auto Fill in control bar */
.control-bar .auto-fill-control {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 6px;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
}

.control-bar .control-label-text {
  font-size: 9px;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.control-bar .auto-fill-btn {
  min-width: 24px;
  padding: 3px 6px;
  font-size: 11px;
}

/* Tap button in control bar */
.control-bar .tap-btn {
  padding: 4px 10px;
  font-size: 9px;
  min-width: 42px;
  border-width: 1px;
}

/* Transport button in control bar */
.control-bar .transport-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6px 10px;
  min-width: 40px;
  height: 32px;
}

.transport-btn svg {
  width: 21px;
  height: 21px;
}

.transport-btn .stop-icon {
  display: none;
}

.transport-btn.playing .play-icon {
  display: none;
}

.transport-btn.playing .stop-icon {
  display: block !important;
}

/* Icon buttons in control bar */
.control-bar .icon-btn {
  width: 28px;
  height: 28px;
}

/* Mixer collapse button in control bar */
#mixer-collapse-btn svg {
  transition: transform var(--transition-normal);
}

#mixer-collapse-btn.collapsed svg {
  transform: rotate(180deg);
}

/* Mobile control bar */
@media (max-width: 768px) {
  .control-bar {
    gap: 4px;
    padding: 4px 6px;
  }

  .control-bar .tempo-knob-container .knob {
    width: 42px;
    height: 42px;
  }

  .control-bar .shuffle-knob-container .knob {
    width: 36px;
    height: 36px;
  }

  .control-bar .tempo-knob-container .knob-label,
  .control-bar .shuffle-knob-container .knob-label {
    font-size: 8px;
  }

  .control-bar .transport-btn {
    padding: 5px 8px;
    min-width: 36px;
    height: 28px;
  }

  .control-bar .transport-btn svg {
    width: 18px;
    height: 18px;
  }
}

/* Zone 2: Mixer Row (collapsible) */
.mixer-row {
  flex-shrink: 0;
  display: flex;
  position: relative;
  transition: max-height var(--transition-normal);
  max-height: 200px;
  /* Default expanded height */
}

.mixer-row.mixer-collapsed {
  max-height: 0;
  overflow: hidden;
}

.instrument-mixer {
  flex: 1;
  display: flex;
  gap: var(--spacing-xs);
  padding: 6px var(--spacing-sm) 12px var(--spacing-sm);
  background: var(--color-surface);
  border-radius: var(--border-radius);
  overflow-x: auto;
  transition: all var(--transition-normal);
}

/* Mixer collapse button - positioned at bottom of control bar or top of mixer */
.mixer-collapse-btn {
  position: absolute;
  top: -32px;
  right: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  z-index: 10;
}

.mixer-collapse-btn:hover {
  background: var(--color-surface-raised);
  color: var(--color-text);
}

.mixer-collapse-btn svg {
  transition: transform var(--transition-normal);
}

.mixer-row.mixer-collapsed+.mixer-collapse-btn svg,
.mixer-collapse-btn.collapsed svg {
  transform: rotate(180deg);
}

/* Zone 3: Editor row */
.editor-row {
  flex: 1;
  min-height: 0;
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  overflow-x: auto;
  overflow-y: auto;
}

.editor-zone {
  flex: 1;
  min-height: 0;
  min-width: 950px;
  overflow: auto;
}

#pattern-editor {
  display: flex;
  gap: var(--spacing-sm);
  height: 100%;
}

.track-number-display #track-number {
  color: var(--color-accent);
  font-weight: 600;
}

.tempo-display {
  display: none;
  /* Tempo now shown inside knob */
}

.tempo-knob-container,
.shuffle-knob-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.tempo-knob-container .knob {
  width: 100px;
  height: 100px;
}

.shuffle-knob-container .knob {
  width: 60px;
  height: 60px;
}

.tempo-knob-container .knob-label,
.shuffle-knob-container .knob-label {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
}

/* Knob center value text */
.knob-value-text {
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 13px;
  font-weight: 700;
  fill: var(--color-accent);
}

/* Tempo knob text - smaller to avoid overlap with tick */
.knob-tempo .knob-value-text {
  font-size: 10px;
}

/* Tempo knob: Black with orange indicator */
.knob.knob-tempo .knob-body {
  fill: #1a1a1a;
}

.knob.knob-tempo:hover .knob-body,
.knob.knob-tempo.dragging .knob-body {
  fill: #2a2a2a;
}

.knob.knob-tempo .knob-indicator {
  stroke: var(--color-accent);
}

/* Variation Panel - unified container for all variation controls */
.variation-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: var(--color-surface);
  border-radius: var(--border-radius);
  flex-shrink: 0;
  width: 146px;
}

/* Shared control label styling */
.control-label-text,
.variation-label {
  font-size: 9px;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
  min-width: 52px;
}

/* Basic Variation Control */
.variation-control {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 6px;
}

.variation-btn {
  min-width: 34px;
  padding: 3px 5px;
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  color: var(--color-accent);
  font-family: inherit;
  font-size: 12px;
  font-weight: 700;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.variation-btn:hover {
  background: #3a3a3a;
  border-color: #555;
  color: #ff8555;
}

.variation-btn:active {
  transform: scale(0.95);
}

.variation-leds {
  display: flex;
  gap: 6px;
}

.variation-led {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #331111;
  border: 1px solid #441111;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.5);
  transition: all 0.1s ease;
  cursor: pointer;
  padding: 0;
}

.variation-led:hover {
  background: #441818;
  border-color: #552222;
}

.variation-led.active {
  background: #ff3333;
  border-color: #ff4444;
  box-shadow:
    inset 0 1px 2px rgba(255, 255, 255, 0.3),
    0 0 8px rgba(255, 50, 50, 0.8),
    0 0 16px rgba(255, 50, 50, 0.4);
}

.variation-led.playing {
  background: #ff3333;
  border-color: #ff4444;
  box-shadow:
    inset 0 1px 2px rgba(255, 255, 255, 0.3),
    0 0 8px rgba(255, 50, 50, 0.8),
    0 0 16px rgba(255, 50, 50, 0.4);
  animation: led-flash 0.5s ease-in-out infinite;
}

@keyframes led-flash {

  0%,
  100% {
    opacity: 1;
    box-shadow: 0 0 8px rgba(255, 50, 50, 0.8), 0 0 16px rgba(255, 50, 50, 0.4);
  }

  50% {
    opacity: 0.7;
    box-shadow: 0 0 4px rgba(255, 50, 50, 0.4);
  }
}

.variation-switch {
  display: flex;
  background: #1a1a1a;
  border-radius: var(--border-radius);
  padding: 2px;
  gap: 2px;
}

.variation-switch-btn {
  padding: var(--spacing-xs) var(--spacing-sm);
  background: transparent;
  border: none;
  border-radius: calc(var(--border-radius) - 2px);
  color: var(--color-text-muted);
  font-family: inherit;
  font-size: var(--font-size-small);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  min-width: 32px;
}

.variation-switch-btn:hover {
  color: var(--color-text);
  background: #2a2a2a;
}

.variation-switch-btn.active {
  background: var(--color-accent);
  color: white;
}

.variation-label {
  font-size: 10px;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Auto Fill Control */
.auto-fill-control {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  gap: 4px;
}

.auto-fill-btn {
  min-width: 28px;
  padding: 4px 8px;
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  color: var(--color-accent);
  font-family: inherit;
  font-size: 12px;
  font-weight: 700;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.auto-fill-btn:hover {
  background: #3a3a3a;
  border-color: #555;
  color: #ff8555;
}

.auto-fill-btn:active {
  transform: scale(0.95);
}

/* I/F Variation Control */
.if-variation-control {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 4px;
}

/* Compact I/F variation inside transport block */
.compact-if-variation {
  gap: 4px;
}

.if-label {
  font-size: 10px;
  color: var(--color-text-muted);
  font-weight: 600;
  text-transform: uppercase;
}

.if-variation-btn-cycle {
  min-width: 26px;
  padding: 3px 5px;
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  color: #cc6600;
  font-family: inherit;
  font-size: 12px;
  font-weight: 700;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.if-variation-btn-cycle:hover {
  background: #3a3a3a;
  border-color: #555;
  color: #dd7700;
}

.if-variation-btn-cycle:active {
  transform: scale(0.95);
}

/* Old I/F variation switch (for variation panel if needed) */
.if-variation-switch {
  display: flex;
  background: #1a1a1a;
  border-radius: var(--border-radius);
  padding: 2px;
  gap: 2px;
}

.if-variation-btn {
  padding: var(--spacing-xs) var(--spacing-sm);
  background: transparent;
  border: none;
  border-radius: calc(var(--border-radius) - 2px);
  color: var(--color-text-muted);
  font-family: inherit;
  font-size: var(--font-size-small);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  min-width: 40px;
}

.if-variation-btn:hover {
  color: var(--color-text);
  background: #2a2a2a;
}

.if-variation-btn.active {
  background: #cc6600;
  color: white;
}

/* TAP Button (fill trigger) */
.tap-btn {
  padding: 4px 10px;
  background: #333;
  border: 1px solid #555;
  border-radius: var(--border-radius);
  color: var(--color-text-muted);
  font-family: inherit;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: all var(--transition-fast);
  min-width: 45px;
}

.tap-btn:hover {
  background: #444;
  color: var(--color-text);
  border-color: #777;
}

.tap-btn:active {
  transform: scale(0.95);
  background: #cc6600;
  border-color: #cc6600;
  color: white;
}

.tap-btn.fill-active {
  background: #cc6600;
  border-color: #cc6600;
  color: white;
  box-shadow: 0 0 8px rgba(204, 102, 0, 0.5);
}

.transport-btn {
  background: var(--color-accent);
  border: 1px solid var(--color-accent-dim);
  border-radius: var(--border-radius);
  color: white;
  font-family: inherit;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.transport-btn:hover {
  background: #ff8555;
}

.transport-btn:active {
  transform: scale(0.98);
}

.transport-btn.playing {
  background: #dd4444;
  border-color: #aa3333;
  animation: pulse-glow 1s ease-in-out infinite;
}

.transport-btn.playing:hover {
  background: #ee5555;
}

@keyframes pulse-glow {

  0%,
  100% {
    box-shadow: 0 0 8px rgba(221, 68, 68, 0.4);
  }

  50% {
    box-shadow: 0 0 16px rgba(221, 68, 68, 0.7);
  }
}

/* Zone 3: Pattern Selector (fixed height) */
.selector-zone {
  flex-shrink: 0;
  border-top: 1px solid var(--color-border);
  padding-top: var(--spacing-md);
}

/* Drag over state */
#app.drag-over {
  outline: 2px dashed var(--color-accent);
  outline-offset: var(--spacing-sm);
}

/* ========================================
   Control Bar
   ======================================== */

.icon-btn {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  background: none;
  border: 1px solid transparent;
  border-radius: var(--border-radius);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.icon-btn:hover {
  color: var(--color-text);
  border-color: var(--color-border);
  background: none;
}

.icon-btn:active {
  color: var(--color-accent);
  background: none;
}

.midi-dot {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-text-dim);
  transition: background var(--transition-fast);
}

.midi-dot.connected {
  background: #4caf50;
}

/* ========================================
   Instrument Mixer & Knobs
   ======================================== */

.mixer-channel {
  display: grid;
  grid-template-rows: 20px 48px 48px 48px;
  /* label, row1, row2, row3 - compact for mobile */
  justify-items: center;
  align-items: start;
  gap: 0px;
  min-width: 66px;
}

.channel-label {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  /* Fill grid row */
}

/* Mixer flip panel button (replaces AC label) */
.mixer-flip-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  align-self: center;
  /* Center in grid row */
  width: 32px;
  height: 24px;
  padding: 0;
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mixer-flip-btn:hover {
  background: var(--color-border);
  color: var(--color-text);
  border-color: var(--color-text-muted);
}

.mixer-flip-btn:active {
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
}

.mixer-flip-btn svg {
  width: 16px;
  height: 16px;
}

.knob-row,
.knob-container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.knob-container {
  gap: 2px;
}

.knob-label {
  font-size: 12px;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.knob {
  width: 40px;
  height: 40px;
  cursor: pointer;
  user-select: none;
  touch-action: none; /* Enable custom touch handling on iOS */
}

.knob-body {
  stroke: none;
  transition: fill var(--transition-fast);
}

.knob-ring {
  transition: stroke var(--transition-fast);
}

.knob-indicator {
  stroke-width: 3;
  stroke-linecap: round;
}

/* Common knob dragging state for ring */
.knob.dragging .knob-ring {
  stroke: var(--color-accent);
}

/* Level knobs (row 1): Orange with black indicator */
.knob.knob-level .knob-body {
  fill: var(--color-accent);
}

.knob.knob-level:hover .knob-body {
  fill: #ff8050;
}

.knob.knob-level.dragging .knob-body {
  fill: #ff9060;
}

.knob.knob-level .knob-indicator {
  stroke: #1a1a1a;
}

/* Parameter knobs (rows 2-3): White with black indicator */
.knob.knob-param .knob-body {
  fill: #e8e8e8;
}

.knob.knob-param:hover .knob-body {
  fill: #fff;
}

.knob.knob-param.dragging .knob-body {
  fill: #fff;
}

.knob.knob-param .knob-indicator {
  stroke: #1a1a1a;
}

.knob-value {
  font-size: 12px;
  color: var(--color-text-dim);
  text-align: center;
  min-height: 18px;
}

/* ========================================
   Buttons
   ======================================== */

button {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  color: var(--color-text);
  font-family: inherit;
  font-size: var(--font-size-small);
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

button:hover {
  background: var(--color-border);
}

button:active {
  background: var(--color-accent-dim);
}

button.active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: white;
}

button.semi-active {
  background: var(--color-accent-dim);
  border-color: var(--color-accent-dim);
  color: var(--color-text);
}

/* ========================================
   Form Controls
   ======================================== */

select,
input {
  padding: var(--spacing-sm);
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  color: var(--color-text);
  font-family: inherit;
  font-size: var(--font-size-small);
}

select:focus,
input:focus {
  outline: none;
  border-color: var(--color-accent);
}

.midi-select {
  min-width: 200px;
}


/* ========================================
   Control Groups
   ======================================== */

.transport-controls {
  display: flex;
  gap: var(--spacing-xs);
  align-items: center;
}

.control-label {
  color: var(--color-text-muted);
  font-size: var(--font-size-small);
}

.part-length-label {
  color: var(--color-text-dim);
  font-size: var(--font-size-label);
  margin-left: var(--spacing-sm);
}

/* Transport controls */
.play-btn {
  min-width: 60px;
  font-weight: 600;
}

.play-btn.playing {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: white;
}

.tempo-input {
  width: 70px;
  text-align: center;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}


/* ========================================
   Pattern Grid
   ======================================== */

.pattern-grid {
  display: flex;
  flex-direction: column;
  gap: var(--cell-gap);
  background: var(--color-surface);
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
  overflow-x: auto;
  flex: 1;
  min-width: fit-content;
  /* Prevent collapse, allow horizontal scroll */
}

.grid-row {
  display: flex;
  gap: var(--cell-gap);
}

.grid-header {
  margin-bottom: var(--spacing-xs);
}

/* Length brace (draggable pattern length indicator) */
.length-brace-row {
  display: flex;
  gap: var(--cell-gap);
  height: 8px;
}

.length-brace-spacer {
  width: var(--label-width);
  flex-shrink: 0;
}

.length-brace-container {
  position: relative;
  flex: 1;
}

.length-brace {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  border-left: 2px solid var(--color-accent);
  border-top: 2px solid var(--color-accent);
  border-radius: 3px 0 0 0;
  pointer-events: none;
  transition: width 0.05s ease-out;
}

.length-brace::after {
  content: '';
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-accent);
}

.length-brace.dragging {
  transition: none;
  background: rgba(255, 107, 53, 0.12);
}

.length-brace-handle {
  position: absolute;
  right: -6px;
  top: -4px;
  bottom: -4px;
  width: 14px;
  cursor: ew-resize;
  pointer-events: auto;
  z-index: 1;
  touch-action: none; /* Enable custom touch handling on iOS */
}

.length-brace-handle::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 25%;
  width: 4px;
  margin-left: -2px;
  background: var(--color-accent);
  border-radius: 2px;
  transition: width 0.1s, margin-left 0.1s;
}

.length-brace-handle:hover::before,
.length-brace.dragging .length-brace-handle::before {
  width: 6px;
  margin-left: -3px;
  background: #ff9060;
}

.grid-cell {
  flex-shrink: 0;
}

/* Label cells */
.grid-label {
  width: var(--label-width);
  height: var(--cell-height);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: var(--spacing-sm);
  color: var(--color-text-muted);
  font-size: var(--font-size-label);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  cursor: pointer;
  user-select: none;
  transition: color var(--transition-fast);
}

.grid-row .grid-label:hover {
  color: var(--color-text);
}

/* Alt-instrument indicator on grid labels (passive, toggled from mixer) */
.grid-label.alt-active {
  color: var(--color-accent);
}

/* Clickable alt-instrument labels in mixer (e.g., LT ↔ LC) */
.channel-label.has-alt {
  cursor: pointer;
  border-bottom: 1px dashed transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.channel-label.has-alt:hover {
  border-bottom-color: var(--color-text-muted);
}

.channel-label.alt-active {
  color: var(--color-accent);
}

/* Scale button in header row label cell */
.scale-btn {
  cursor: pointer;
  justify-content: center;
  padding-right: 0;
  color: var(--color-text-dim);
  transition: color var(--transition-fast);
}

.scale-btn:hover {
  color: var(--color-accent);
}

/* Step header cells */
.step-header {
  width: var(--cell-size);
  height: var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-dim);
  font-size: var(--font-size-label);
}

/* Visual grouping for step headers and cells (dynamic based on scale) */
.step-header.group-accent {
  color: var(--color-text);
  font-weight: 600;
}

/* Inactive step headers - quarter brightness */
/* Higher specificity by combining with base class, no !important needed */
.step-header.inactive,
.step-header.inactive.group-accent {
  opacity: 0.25;
  color: var(--color-text-dim);
  font-weight: normal;
}

/* Step cells */
.step-cell {
  width: var(--cell-size);
  height: var(--cell-height);
  position: relative;
  cursor: pointer;
  border-radius: var(--border-radius-sm);
}

/* Alternating backgrounds for step groups */
.step-cell.group-a {
  background: #7e7e7e;
}

.step-cell.group-b {
  background: #545454;
}

/* Inactive cells - half as bright as before */
.step-cell.inactive.group-a {
  background: #1f1f1f;
}

.step-cell.inactive.group-b {
  background: #151515;
}

.step-cell.inactive {
  pointer-events: none;
}

/* Active beats in inactive cells - quarter brightness */
.step-cell.inactive .beat.on,
.step-cell.inactive .beat.shadow {
  opacity: 0.25;
}

.step-cell.playing::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: -8px;
  transform: translateX(-50%);
  width: 8px;
  height: 8px;
  background: #ff4444;
  border-radius: 50%;
  box-shadow: 0 0 6px #ff4444;
}


/* Beat indicators (main/back) - overlapping design */
.beat {
  position: absolute;
  top: 0;
  bottom: 0;
  border-radius: var(--border-radius-sm);
  transition: background var(--transition-fast), opacity var(--transition-fast), left 0s, right 0s, width 0s;
  opacity: 0;
  /* Hidden by default */
  pointer-events: none;
}

/* Main beat: 70% width on the left (0-70%) */
.main-beat {
  left: 0;
  right: 30%;
}

/* Back beat: 60% width on the right (40-100%) */
.back-beat {
  left: 40%;
  right: 0;
}

/* When both beats are on: fill the entire cell with a divider */
.step-cell.both-beats .main-beat {
  left: 0;
  right: 50%;
  border-right: 2px solid rgba(0, 0, 0, 0.3);
}

.step-cell.both-beats .back-beat {
  left: 50%;
  right: 0;
}

/* Show beats when active and enable interaction */
/* z-index: 1 ensures active beats render on top of the inactive
   hover-background beat that overlaps (back-beat covers 30-100%,
   main-beat covers 0-80%, so they overlap at 30-80%) */
.beat.on,
.beat.shadow {
  opacity: 1;
  pointer-events: auto;
  z-index: 1;
}

/* Show beats on hover for empty cells */
.step-cell:hover .beat {
  opacity: 1;
  pointer-events: auto;
}

/* Hover backgrounds for empty beats */
.step-cell.group-a:hover .beat:not(.on):not(.shadow) {
  background: #4a4a4a;
}

.step-cell.group-b:hover .beat:not(.on):not(.shadow) {
  background: var(--color-border);
}

/* Color-coded beat indicators (4 colors, repeating every 16 steps) */
.step-cell.color-1 .beat.on {
  background: #ff4444;
  /* Red */
}

.step-cell.color-2 .beat.on {
  background: #ff8844;
  /* Orange */
}

.step-cell.color-3 .beat.on {
  background: #ffdd44;
  /* Yellow */
}

.step-cell.color-4 .beat.on {
  background: #e8e8e8;
  /* White */
}

/* Hover states for colored beats */
.step-cell.color-1 .beat.on:hover {
  background: #ff6666;
}

.step-cell.color-2 .beat.on:hover {
  background: #ffaa66;
}

.step-cell.color-3 .beat.on:hover {
  background: #ffee66;
}

.step-cell.color-4 .beat.on:hover {
  background: #ffffff;
}

.beat.shadow {
  background: var(--color-step-shadow);
}

.beat.shadow:hover {
  background: var(--color-step-shadow-hover);
}


/* ========================================
   Modal
   ======================================== */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn var(--transition-normal);
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

.modal {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  min-width: 360px;
  max-width: 90vw;
  animation: slideUp var(--transition-normal);
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal-title {
  margin: 0 0 var(--spacing-lg) 0;
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
}

.modal-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.form-group label {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
}

.form-control {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  color: var(--color-text);
  font-family: inherit;
  font-size: var(--font-size-base);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-accent);
}

.form-control:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.form-group.disabled {
  opacity: 0.5;
}

.form-group.disabled label {
  cursor: not-allowed;
}

.radio-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.radio-option {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
}

.radio-option input[type="radio"] {
  margin-top: 3px;
  cursor: pointer;
  accent-color: var(--color-accent);
}

.radio-label {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
  cursor: pointer;
  user-select: none;
}

.radio-label-text {
  font-size: var(--font-size-base);
  color: var(--color-text);
  font-weight: 500;
}

.radio-label-desc {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
}

.radio-option input[type="radio"]:checked+.radio-label .radio-label-text {
  color: var(--color-accent);
}

.radio-option.disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.radio-option.disabled input[type="radio"],
.radio-option.disabled .radio-label {
  cursor: not-allowed;
}

.modal-buttons {
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
}

.btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  font-family: inherit;
  font-size: var(--font-size-small);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-secondary {
  background: var(--color-surface-raised);
  color: var(--color-text);
}

.btn-secondary:hover {
  background: var(--color-border);
}

.btn-primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: white;
}

.btn-primary:hover {
  background: var(--color-accent-dim);
  border-color: var(--color-accent-dim);
}

/* ========================================
   Context Menu
   ======================================== */

.context-menu {
  position: fixed;
  z-index: 10000;
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  padding: var(--spacing-xs) 0;
  min-width: 60px;
}

.context-menu-item {
  padding: var(--spacing-sm) var(--spacing-md);
  cursor: pointer;
  color: var(--color-text);
  font-size: var(--font-size-small);
  user-select: none;
  transition: background var(--transition-fast);
}

.context-menu-item:hover {
  background: var(--color-border);
}

.context-menu-item:active {
  background: var(--color-accent);
  color: white;
}

.context-menu-divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--spacing-xs) 0;
}


/* ========================================
   Pattern Selector
   ======================================== */

.pattern-selector {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

/* Bank selector row */
.bank-selector {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.bank-buttons {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

.bank-btn {
  width: 32px;
  height: 28px;
  padding: 0;
  font-size: var(--font-size-small);
  font-weight: 500;
}

.bank-btn.active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: white;
}

/* Thumbnail grid - responsive */
.thumbnail-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  align-items: flex-start;
}

/* Individual thumbnail */
.pattern-thumbnail {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  cursor: pointer;
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.pattern-thumbnail:hover {
  border-color: var(--color-text-muted);
}

.pattern-thumbnail.selected {
  border-color: var(--color-accent);
  box-shadow: 0 0 8px var(--color-accent-dim);
}

.pattern-thumbnail.selected.playing {
  animation: pattern-pulse-glow 1s ease-in-out infinite;
}

@keyframes pattern-pulse-glow {

  0%,
  100% {
    box-shadow: 0 0 8px var(--color-accent-dim);
  }

  50% {
    box-shadow: 0 0 16px var(--color-accent);
  }
}

/* Pattern label */
.thumb-label {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-label);
  font-weight: 600;
  color: var(--color-text-muted);
  background: var(--color-surface-raised);
  text-align: center;
}

.pattern-thumbnail.selected .thumb-label {
  color: var(--color-accent);
}

/* Main pattern selection indicator */
.pattern-thumbnail.main-selected {
  border-color: #ff9933;
}

.pattern-thumbnail.main-selected .thumb-label {
  color: #ff9933;
}

.pattern-thumbnail.main-selected.selected {
  border-color: var(--color-accent);
  box-shadow: 0 0 8px var(--color-accent-dim), inset 0 0 0 1px #ff9933;
}

/* Fill pattern selection indicator */
.pattern-thumbnail.fill-selected {
  border-color: #cc6600;
}

.pattern-thumbnail.fill-selected .thumb-label {
  color: #cc6600;
}

.pattern-thumbnail.fill-selected.selected {
  border-color: var(--color-accent);
  box-shadow: 0 0 8px var(--color-accent-dim), inset 0 0 0 1px #cc6600;
}

/* Mini grid inside thumbnail */
.thumb-grid {
  display: grid;
  /* Columns set dynamically based on pattern length */
  grid-template-columns: repeat(16, 1fr);
  /* default fallback */
  grid-template-rows: repeat(11, 1fr);
  /* 11 instruments (XT hidden) */
  gap: 0;
  height: 48px;
  /* Fixed height - width varies with pattern length */
  padding: 2px;
  background: var(--color-bg);
}

/* Thumbnail cells */
.thumb-cell {
  background: var(--color-surface);
  border-radius: 1px;
}

.thumb-cell.on {
  background: var(--color-step-on);
}

.thumb-cell.shadow {
  background: var(--color-step-shadow);
}

.thumb-cell.inactive {
  background: var(--color-bg);
}

/* ========================================
   Track Editor
   ======================================== */

.track-editor {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 200px;
}

.track-timeline-wrapper {
  flex: 1;
  overflow-y: auto;
  background: var(--color-surface);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
}

.track-timeline {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  align-items: flex-start;
}

.track-bar {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  cursor: pointer;
  position: relative;
}

.track-editor.playing .track-bar.selected .pattern-thumbnail.selected {
  animation: pulse-glow 1s ease-in-out infinite;
}

@keyframes pulse-glow {

  0%,
  100% {
    box-shadow: 0 0 8px var(--color-accent-dim);
  }

  50% {
    box-shadow: 0 0 16px var(--color-accent);
  }
}

.track-add-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 80px;
  height: 80px;
  background: var(--color-surface-raised);
  border: 2px dashed var(--color-border);
  border-radius: var(--border-radius);
  color: var(--color-text-muted);
  font-size: 32px;
  font-weight: 300;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.track-add-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-surface);
}

.track-empty-message {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--spacing-lg);
  color: var(--color-text-muted);
  font-size: var(--font-size-small);
}

/* ========================================
   Track Editor (Placeholder - for unused state)
   ======================================== */

.track-editor-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  min-height: 200px;
  background: var(--color-surface);
  border-radius: var(--border-radius);
  color: var(--color-text-muted);
  text-align: center;
  padding: var(--spacing-lg);
}

.track-editor-placeholder p {
  margin: 0;
}

.track-editor-placeholder p:first-child {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.placeholder-hint {
  font-size: var(--font-size-small);
  color: var(--color-text-dim);
}

/* ========================================
   Responsive Styles
   ======================================== */

/* Mobile-first optimizations for iPhone and small screens */
@media (max-width: 768px) {

  /* Compact editor row */
  .editor-row {
    gap: 4px;
  }

  /* Minimize selector zone */
  .selector-zone {
    padding-top: 4px;
  }

  .pattern-selector {
    padding: 4px;
    gap: 4px;
  }

  .bank-selector {
    gap: 4px;
    flex-wrap: nowrap;
  }

  .control-label {
    font-size: 9px;
  }

  .bank-buttons {
    gap: 2px;
  }

  .bank-btn {
    min-width: 18px;
    padding: 3px;
    font-size: 9px;
  }

  .thumbnail-grid {
    gap: 3px;
    grid-template-columns: repeat(2, 1fr);
  }

  .thumbnail-container {
    height: 60px;
  }
}

/* Very small screens */
@media (max-width: 600px) {
  .bank-buttons {
    width: 100%;
    justify-content: space-between;
  }

  .bank-btn {
    flex: 1;
    max-width: 40px;
  }
}

/* ========================================
   Print Styles
   ======================================== */

@media print {
  body {
    background: white;
    color: black;
  }

  .instrument-mixer {
    display: none;
  }

  .beat.on {
    background: black;
  }

  .beat:not(.on) {
    background: #ddd;
  }
}