/**
 * CONJUR.IN - Application Styles
 * Dark theme with electric purple accent
 */

/* ============================================================================
   CSS VARIABLES
   ============================================================================ */

:root {
  /* Colors */
  --bg-dark: #0d0d14;
  --bg-panel: #1a1a2e;
  --bg-control: #252542;
  --bg-input: #16162a;

  --accent: #7b68ee;         /* Electric purple */
  --accent-hover: #9580ff;
  --accent-dim: #4a3f8c;

  --text: #e8e8f0;
  --text-dim: #8888a0;
  --text-label: #a0a0b8;

  --border: #3a3a5c;
  --border-focus: #7b68ee;

  --success: #50fa7b;
  --warning: #ffb86c;
  --danger: #ff5555;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;

  /* Borders */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 20px rgba(123, 104, 238, 0.3);

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-mono: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
}

/* ============================================================================
   RESET & BASE
   ============================================================================ */

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

html {
  font-size: 16px;
  /* Prevent horizontal overflow */
  overflow-x: hidden;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-dark);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  min-height: 100dvh; /* Dynamic viewport height for mobile */
  overflow-x: hidden;
  /* Safe area for notched phones */
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
  padding-bottom: env(safe-area-inset-bottom);
  /* Prevent pull-to-refresh and double-tap zoom on mobile */
  overscroll-behavior: none;
  touch-action: manipulation;
  /* Prevent text size adjustment on orientation change */
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

/* ============================================================================
   LAYOUT
   ============================================================================ */

.app {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: var(--space-lg);
  /* Prevent any child from causing overflow */
  overflow-x: hidden;
}

/* Header */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--border);
}

.logo {
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
}

.logo h1 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.02em;
}

.logo .tagline {
  font-size: 0.85rem;
  color: var(--text-dim);
  font-style: italic;
}

.header-actions {
  display: flex;
  gap: var(--space-sm);
}

/* Main Grid */
.main-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

@media (min-width: 768px) {
  .main-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* ============================================================================
   PANELS
   ============================================================================ */

.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  /* Prevent contents from causing overflow */
  overflow: hidden;
  position: relative;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
}

.panel-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
}

/* Full-width panels */
.panel.full-width {
  grid-column: 1 / -1;
}

/* ============================================================================
   WAVEFORM DISPLAY
   ============================================================================ */

.waveform-panel {
  grid-column: 1 / -1;
}

.waveform-container {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  height: 150px;
  position: relative;
  overflow: hidden;
  /* Prevent canvas from causing layout issues */
  contain: strict;
}

.waveform-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.waveform-label {
  position: absolute;
  bottom: var(--space-sm);
  right: var(--space-sm);
  font-size: 0.7rem;
  color: var(--text-dim);
  background: var(--bg-panel);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

/* ============================================================================
   CONTROLS
   ============================================================================ */

.control-group {
  margin-bottom: var(--space-md);
  /* Prevent slider thumb from causing overflow */
  overflow: hidden;
  /* Contain layout changes */
  contain: layout style;
}

.control-group:last-child {
  margin-bottom: 0;
}

.control-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-label);
  margin-bottom: var(--space-xs);
}

.control-value {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
}

/* Range Sliders */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 8px;
  background: var(--bg-input);
  border-radius: 4px;
  outline: none;
  cursor: pointer;
  /* Add padding for better touch target */
  padding: 8px 0;
  margin: 4px 0;
  background-clip: content-box;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.1s;
  /* Better touch target */
  border: 3px solid var(--bg-panel);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

input[type="range"]::-webkit-slider-thumb:hover {
  box-shadow: var(--shadow-glow);
}

input[type="range"]::-webkit-slider-thumb:active {
  background: var(--accent-hover);
  box-shadow: var(--shadow-glow);
}

input[type="range"]::-moz-range-thumb {
  width: 24px;
  height: 24px;
  background: var(--accent);
  border: 3px solid var(--bg-panel);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

input[type="range"]:focus::-webkit-slider-thumb {
  box-shadow: var(--shadow-glow);
}

/* Track styling for better visibility */
input[type="range"]::-webkit-slider-runnable-track {
  height: 8px;
  background: var(--bg-input);
  border-radius: 4px;
}

input[type="range"]::-moz-range-track {
  height: 8px;
  background: var(--bg-input);
  border-radius: 4px;
}

/* Select Dropdowns */
select {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  cursor: pointer;
  outline: none;
  transition: border-color 0.2s;
}

select:hover {
  border-color: var(--accent-dim);
}

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

/* Checkboxes / Toggles */
.toggle-group {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.toggle {
  position: relative;
  width: 40px;
  height: 22px;
}

.toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 11px;
  transition: background 0.2s, border-color 0.2s;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  height: 16px;
  width: 16px;
  left: 2px;
  bottom: 2px;
  background: var(--text-dim);
  border-radius: 50%;
  transition: transform 0.2s, background 0.2s;
}

.toggle input:checked + .toggle-slider {
  background: var(--accent-dim);
  border-color: var(--accent);
}

.toggle input:checked + .toggle-slider::before {
  transform: translateX(18px);
  background: var(--accent);
}

.toggle-label {
  font-size: 0.8rem;
  color: var(--text-label);
}

/* ============================================================================
   BUTTONS
   ============================================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-control);
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

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

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

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

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

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

.btn-large {
  padding: var(--space-md) var(--space-xl);
  font-size: 1rem;
}

.btn-icon {
  padding: var(--space-sm);
  min-width: 36px;
}

/* ============================================================================
   ACTION BAR
   ============================================================================ */

.action-bar {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.play-btn {
  min-width: 120px;
}

/* ============================================================================
   PRESET SELECTOR
   ============================================================================ */

.preset-selector {
  position: relative;
}

.preset-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  width: 280px;
  max-height: 400px;
  overflow-y: auto;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  z-index: 100;
  display: none;
}

.preset-dropdown.open {
  display: block;
}

/* Backdrop for mobile dropdown */
.preset-backdrop {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 99;
}

.preset-backdrop.open {
  display: block;
}

.preset-category {
  padding: var(--space-sm) var(--space-md);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  background: var(--bg-control);
  position: sticky;
  top: 0;
}

.preset-item {
  padding: var(--space-sm) var(--space-md);
  cursor: pointer;
  transition: background 0.1s;
  font-size: 0.9rem;
}

.preset-item:hover {
  background: var(--bg-control);
}

/* ============================================================================
   RECIPE OUTPUT
   ============================================================================ */

.recipe-panel {
  grid-column: 1 / -1;
}

.recipe-output {
  width: 100%;
  height: 200px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text);
  resize: vertical;
  outline: none;
}

.recipe-output:focus {
  border-color: var(--accent);
}

.recipe-actions {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

/* ============================================================================
   ENVELOPE VISUALIZER
   ============================================================================ */

.envelope-viz {
  height: 60px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-md);
  position: relative;
  overflow: hidden;
}

.envelope-canvas {
  width: 100%;
  height: 100%;
}

/* ============================================================================
   INIT OVERLAY
   ============================================================================ */

.init-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(13, 13, 20, 0.95);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  gap: var(--space-lg);
}

.init-overlay.hidden {
  display: none;
}

.init-overlay h2 {
  font-size: 2rem;
  color: var(--accent);
}

.init-overlay p {
  color: var(--text-dim);
  margin-bottom: var(--space-md);
}

/* ============================================================================
   STATUS / FEEDBACK
   ============================================================================ */

.status-bar {
  grid-column: 1 / -1;
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-control);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  color: var(--text-dim);
  text-align: center;
}

.status-bar.success {
  color: var(--success);
  background: rgba(80, 250, 123, 0.1);
}

.status-bar.error {
  color: var(--danger);
  background: rgba(255, 85, 85, 0.1);
}

/* ============================================================================
   HELP MODAL
   ============================================================================ */

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--space-lg);
}

.modal-overlay.hidden {
  display: none;
}

.modal {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  max-width: 600px;
  max-height: 80vh;
  overflow-y: auto;
  padding: var(--space-xl);
}

.modal h2 {
  color: var(--accent);
  margin-bottom: var(--space-md);
}

.modal h3 {
  color: var(--text);
  margin: var(--space-lg) 0 var(--space-sm);
  font-size: 1rem;
}

.modal p {
  color: var(--text-dim);
  margin-bottom: var(--space-md);
}

.modal kbd {
  display: inline-block;
  padding: 2px 6px;
  background: var(--bg-control);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.modal-close {
  float: right;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0;
  line-height: 1;
}

.modal-close:hover {
  color: var(--text);
}

.modal-large {
  max-width: 700px;
}

/* Help Modal Tabs */
.help-tabs {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  border-bottom: 1px solid var(--border);
  padding-bottom: var(--space-sm);
}

.help-tab {
  background: none;
  border: none;
  color: var(--text-dim);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  padding: var(--space-sm) var(--space-md);
  cursor: pointer;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  transition: color 0.2s, background 0.2s;
}

.help-tab:hover {
  color: var(--text);
  background: var(--bg-control);
}

.help-tab.active {
  color: var(--accent);
  background: var(--bg-control);
  border-bottom: 2px solid var(--accent);
}

.help-tab-content {
  display: none;
}

.help-tab-content.active {
  display: block;
}

/* Download Button */
.download-btn {
  display: inline-block;
  background: var(--accent);
  color: var(--bg-dark);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: 600;
  transition: background 0.2s, transform 0.1s;
}

.download-btn:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

/* Code Blocks in Modal */
.modal pre {
  background: var(--bg-dark);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  overflow-x: auto;
  margin: var(--space-sm) 0 var(--space-md);
}

.modal code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #7df;
  line-height: 1.5;
}

.modal pre code {
  color: var(--text);
}

.modal ul {
  color: var(--text-dim);
  margin: var(--space-sm) 0;
  padding-left: var(--space-lg);
}

.modal li {
  margin-bottom: var(--space-sm);
}

.modal li strong {
  color: var(--text);
}

.modal li code {
  background: var(--bg-control);
  padding: 1px 4px;
  border-radius: 3px;
  font-size: 0.85em;
}

.modal a.tab-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}

.modal a.tab-link:hover {
  text-decoration: underline;
}

/* ============================================================================
   RESPONSIVE - MOBILE FIRST
   ============================================================================ */

/* Prevent iOS zoom on input focus */
@media (max-width: 768px) {
  input, select, textarea {
    font-size: 16px !important;
  }
}

/* Small phones */
@media (max-width: 480px) {
  :root {
    --space-lg: 1rem;
    --space-xl: 1.25rem;
  }

  .app {
    padding: var(--space-sm);
  }

  /* Header - compact */
  .header {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-sm);
    padding-bottom: var(--space-sm);
    margin-bottom: var(--space-md);
  }

  .logo {
    justify-content: center;
  }

  .logo h1 {
    font-size: 1.5rem;
  }

  .logo .tagline {
    display: none;
  }

  .header-actions {
    justify-content: center;
  }

  /* Waveform - shorter on mobile */
  .waveform-container {
    height: 100px;
  }

  /* Panels - tighter padding */
  .panel {
    padding: var(--space-md);
    border-radius: var(--radius-md);
  }

  .panel-title {
    font-size: 0.7rem;
  }

  /* Control labels - stack on tiny screens */
  .control-label {
    font-size: 0.75rem;
  }

  .control-value {
    font-size: 0.7rem;
  }

  /* Sliders - even bigger touch targets on mobile */
  input[type="range"] {
    padding: 12px 0;
    margin: 8px 0;
  }

  input[type="range"]::-webkit-slider-thumb {
    width: 28px;
    height: 28px;
  }

  input[type="range"]::-moz-range-thumb {
    width: 28px;
    height: 28px;
  }

  /* Select - bigger touch target */
  select {
    padding: var(--space-md);
    font-size: 1rem;
  }

  /* Toggle - bigger */
  .toggle {
    width: 48px;
    height: 26px;
  }

  .toggle-slider::before {
    width: 20px;
    height: 20px;
  }

  .toggle input:checked + .toggle-slider::before {
    transform: translateX(22px);
  }

  /* Buttons - full width, bigger */
  .btn {
    padding: var(--space-md);
    font-size: 1rem;
    width: 100%;
    justify-content: center;
  }

  .btn-large {
    padding: var(--space-md) var(--space-lg);
  }

  /* Action bar */
  .action-bar {
    padding: var(--space-md);
    gap: var(--space-sm);
  }

  /* Preset dropdown - full width overlay on mobile */
  .preset-dropdown {
    position: fixed;
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    max-height: 60vh;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    border-bottom: none;
  }

  .preset-item {
    padding: var(--space-md);
    font-size: 1rem;
    border-bottom: 1px solid var(--border);
  }

  .preset-category {
    padding: var(--space-md);
    font-size: 0.75rem;
  }

  /* Recipe output - shorter */
  .recipe-output {
    height: 120px;
    font-size: 0.75rem;
  }

  /* Envelope viz - shorter */
  .envelope-viz {
    height: 50px;
  }

  /* Modal - full screen on mobile */
  .modal-overlay {
    padding: 0;
    align-items: flex-end;
  }

  .modal {
    max-width: 100%;
    max-height: 90vh;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    padding: var(--space-lg);
  }

  /* Status bar */
  .status-bar {
    font-size: 0.75rem;
    padding: var(--space-sm);
  }
}

/* Tablets and larger phones */
@media (min-width: 481px) and (max-width: 768px) {
  .app {
    padding: var(--space-md);
  }

  .header {
    flex-wrap: wrap;
  }

  .logo .tagline {
    display: none;
  }

  /* Still single column but with better spacing */
  .main-grid {
    gap: var(--space-md);
  }

  /* Preset dropdown - positioned but wider */
  .preset-dropdown {
    width: 320px;
    max-height: 50vh;
  }

  /* Action bar - wrap nicely */
  .action-bar {
    flex-wrap: wrap;
  }

  .action-bar .btn {
    flex: 1 1 140px;
    min-width: 140px;
  }
}

/* Tablet landscape and small desktop */
@media (min-width: 769px) and (max-width: 1024px) {
  .main-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
  }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
  /* Larger touch targets */
  input[type="range"]::-webkit-slider-thumb {
    width: 28px;
    height: 28px;
  }

  input[type="range"]::-moz-range-thumb {
    width: 28px;
    height: 28px;
  }

  /* No hover effects on touch */
  .btn:hover {
    background: var(--bg-control);
    border-color: var(--border);
  }

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

  /* Active states instead */
  .btn:active {
    background: var(--bg-panel);
    border-color: var(--accent-dim);
    transform: scale(0.98);
  }

  .btn-primary:active {
    background: var(--accent-hover);
  }

  .preset-item:active {
    background: var(--accent-dim);
  }
}

/* Landscape phone - two column where it fits */
@media (max-width: 768px) and (orientation: landscape) {
  .main-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-sm);
  }

  .waveform-panel,
  .action-bar,
  .recipe-panel,
  .status-bar {
    grid-column: 1 / -1;
  }

  .waveform-container {
    height: 80px;
  }
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================================================
   FLOATING ACTION BUTTON
   ============================================================================ */

.fab {
  position: fixed;
  bottom: calc(var(--space-lg) + env(safe-area-inset-bottom));
  right: var(--space-lg);
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--accent);
  border: none;
  color: white;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4), 0 0 20px rgba(123, 104, 238, 0.3);
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s, background 0.15s, box-shadow 0.15s;
  /* Prevent it from being covered */
  touch-action: manipulation;
}

.fab:hover {
  background: var(--accent-hover);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.5), 0 0 30px rgba(123, 104, 238, 0.4);
}

.fab:active {
  transform: scale(0.95);
}

.fab:disabled {
  background: var(--bg-control);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  cursor: not-allowed;
}

.fab.playing {
  animation: fab-pulse 0.4s ease-in-out infinite;
}

@keyframes fab-pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(0.92); }
}

/* Mobile adjustments */
@media (max-width: 480px) {
  .fab {
    width: 56px;
    height: 56px;
    bottom: calc(var(--space-md) + env(safe-area-inset-bottom));
    right: var(--space-md);
  }
}

/* ============================================================================
   ANIMATIONS
   ============================================================================ */

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.playing .play-btn {
  animation: pulse 0.5s ease-in-out infinite;
}

/* ============================================================================
   UTILITY CLASSES
   ============================================================================ */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.flex-row {
  display: flex;
  gap: var(--space-md);
}

.flex-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.mt-md { margin-top: var(--space-md); }
.mb-md { margin-bottom: var(--space-md); }

/* ============================================================================
   APP TABS - Main navigation between Editor and Sequencer
   ============================================================================ */

.app-tabs {
  display: flex;
  gap: 2px;
  background: var(--bg-dark);
  padding: 0 var(--space-md);
  margin-bottom: var(--space-md);
}

.app-tab {
  background: var(--bg-panel);
  border: none;
  color: var(--text-dim);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 500;
  padding: var(--space-md) var(--space-lg);
  cursor: pointer;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  transition: color 0.2s, background 0.2s;
  position: relative;
}

.app-tab:hover {
  color: var(--text);
  background: var(--bg-control);
}

.app-tab.active {
  color: var(--accent);
  background: var(--bg-panel);
}

.app-tab.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
}

.app-view {
  display: none;
}

.app-view.active {
  display: block;
}

/* ============================================================================
   SEQUENCER STYLES
   ============================================================================ */

.sequencer {
  padding: var(--space-md);
  max-width: 1000px;
  margin: 0 auto;
}

/* Transport Controls */
.seq-transport {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-lg);
  padding: var(--space-md);
  background: var(--bg-panel);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
}

.seq-play-btn {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  padding: 0;
}

.seq-play-btn .stop-icon {
  display: none;
}

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

.seq-play-btn.playing .stop-icon {
  display: block;
}

.seq-bpm,
.seq-swing {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.seq-bpm label,
.seq-swing label,
.seq-pattern-select label {
  font-size: 0.75rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.seq-bpm input[type="number"] {
  width: 80px;
  padding: var(--space-sm);
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 1rem;
  font-family: var(--font-mono);
}

.btn-tap {
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.75rem;
  font-weight: bold;
  min-width: auto;
  transition: transform 0.1s, background 0.1s;
}

.btn-tap:active,
.btn-tap.tapping {
  transform: scale(0.95);
  background: var(--accent);
  color: white;
}

.seq-swing {
  flex-direction: row;
  align-items: center;
  gap: var(--space-sm);
}

.seq-swing input[type="range"] {
  width: 100px;
}

.seq-swing span {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-dim);
  min-width: 40px;
}

.seq-pattern-select {
  margin-left: auto;
}

.pattern-buttons {
  display: flex;
  gap: 2px;
}

.pattern-btn {
  width: 36px;
  height: 36px;
  background: var(--bg-control);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.15s;
}

.pattern-btn:hover {
  background: var(--bg-input);
  color: var(--text);
}

.pattern-btn.active {
  background: var(--accent);
  color: var(--bg-dark);
  border-color: var(--accent);
}

/* Sound Bank */
.seq-sound-bank {
  background: var(--bg-panel);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-md);
}

.seq-sound-bank h3 {
  font-size: 0.85rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}

.seq-sound-bank h3 .bank-hint {
  font-size: 0.7rem;
  font-weight: normal;
  text-transform: none;
  letter-spacing: normal;
  opacity: 0.7;
}

.sound-slots {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: var(--space-sm);
}

.sound-slot {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: var(--space-sm);
  background: var(--bg-control);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s;
  min-height: 60px;
}

.sound-slot:hover {
  background: var(--bg-input);
  border-color: var(--accent-dim);
}

.sound-slot.selected {
  border-color: var(--accent);
  box-shadow: 0 0 8px rgba(123, 104, 238, 0.3);
}

.sound-slot.has-sound {
  background: var(--accent-dim);
  border-color: var(--accent);
}

.sound-slot.is-sample {
  border-color: var(--success);
  background: rgba(76, 175, 80, 0.15);
}

.sound-slot.is-sample .slot-num {
  background: var(--success);
}

.sound-slots.drag-over {
  background: var(--accent-dim);
  border: 2px dashed var(--accent);
  border-radius: var(--radius-md);
}

/* Sample Controls Panel */
.sample-controls {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-top: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-control);
  border: 1px solid var(--success);
  border-radius: var(--radius-sm);
}

.sample-controls.hidden {
  display: none;
}

.sample-controls-label {
  font-weight: bold;
  color: var(--success);
  min-width: 80px;
}

.sample-control {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.sample-control label {
  font-size: 0.85rem;
  color: var(--text-label);
}

.sample-control input[type="range"] {
  width: 80px;
}

.sample-control input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--success);
}

.sample-control select {
  padding: 2px 4px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.85rem;
}

#sample-pitch-value {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  min-width: 48px;
}

.sound-slot .slot-num {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: bold;
  color: var(--text);
}

.sound-slot .slot-name {
  font-size: 0.65rem;
  color: var(--text-dim);
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
  max-width: 100%;
}

.sound-bank-hint {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: var(--space-sm);
  text-align: center;
}

/* Step Grid */
.seq-grid {
  background: var(--bg-panel);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-md);
  overflow-x: auto;
}

.seq-track {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.track-header {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  min-width: 180px;
}

.track-mute {
  width: 28px;
  height: 28px;
  padding: 0;
  background: var(--bg-control);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  font-size: 0.75rem;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.15s;
}

.track-mute:hover {
  background: var(--danger);
  color: white;
  border-color: var(--danger);
}

.track-mute.muted {
  background: var(--danger);
  color: white;
  border-color: var(--danger);
}

.track-solo {
  width: 28px;
  height: 28px;
  padding: 0;
  background: var(--bg-control);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  font-size: 0.75rem;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.15s;
}

.track-solo:hover {
  background: var(--warning);
  color: var(--bg-dark);
  border-color: var(--warning);
}

.track-solo.soloed {
  background: var(--warning);
  color: var(--bg-dark);
  border-color: var(--warning);
}

.track-volume {
  width: 60px;
  height: 20px;
  cursor: pointer;
}

.track-sound {
  width: 50px;
  padding: 4px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.85rem;
}

.track-steps {
  display: flex;
  gap: 2px;
}

.step {
  width: 36px;
  height: 36px;
  background: var(--bg-control);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.1s;
  padding: 0;
}

/* Beat grouping - visual separation every 4 steps */
.step[data-step="4"],
.step[data-step="8"],
.step[data-step="12"] {
  margin-left: 6px;
}

.step:hover {
  background: var(--bg-input);
  border-color: var(--accent-dim);
}

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

.step.playing {
  box-shadow: 0 0 12px var(--accent);
  transform: scale(1.1);
}

/* Step Numbers Row */
.step-numbers {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--border);
}

.track-header-spacer {
  min-width: 180px;
}

.step-num-row {
  display: flex;
  gap: 2px;
}

.step-num-row span {
  width: 36px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
}

.step-num-row span:nth-child(4n+5) {
  margin-left: 6px;
}

/* Pattern Chain */
.seq-chain {
  background: var(--bg-panel);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-md);
}

.chain-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-sm);
}

.chain-header h3 {
  font-size: 0.85rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0;
}

.chain-display {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  min-height: 44px;
  padding: var(--space-sm);
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  align-items: center;
}

.chain-empty {
  font-size: 0.8rem;
  color: var(--text-dim);
  font-style: italic;
}

.chain-item {
  display: flex;
  align-items: center;
  gap: 2px;
  background: var(--accent-dim);
  border-radius: var(--radius-sm);
  padding: 4px 8px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text);
}

.chain-item.playing {
  background: var(--accent);
  color: var(--bg-dark);
  box-shadow: 0 0 8px rgba(123, 104, 238, 0.5);
}

.chain-item-remove {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 0.7rem;
  cursor: pointer;
  padding: 0 2px;
  line-height: 1;
  opacity: 0.6;
}

.chain-item-remove:hover {
  color: var(--danger);
  opacity: 1;
}

.chain-arrow {
  color: var(--text-dim);
  font-size: 0.7rem;
  margin: 0 2px;
}

.chain-actions {
  margin-top: var(--space-sm);
  display: flex;
  gap: var(--space-sm);
}

.btn-sm {
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.8rem;
}

/* Sequencer Actions */
.seq-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.seq-actions .btn {
  flex: 1 1 120px;
}

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

@media (max-width: 768px) {
  .seq-transport {
    justify-content: center;
  }

  .seq-pattern-select {
    margin-left: 0;
    width: 100%;
  }

  .pattern-buttons {
    justify-content: center;
  }

  .sound-slots {
    grid-template-columns: repeat(4, 1fr);
  }

  .step {
    width: 28px;
    height: 28px;
  }

  .step[data-step="4"],
  .step[data-step="8"],
  .step[data-step="12"] {
    margin-left: 4px;
  }

  .step-num-row span {
    width: 28px;
    font-size: 0.6rem;
  }

  .step-num-row span:nth-child(4n+5) {
    margin-left: 4px;
  }

  /* Stack track controls vertically on tablet */
  .track-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    min-width: 80px;
    padding: 4px;
    background: var(--bg-control);
    border-radius: var(--radius-sm);
  }

  .track-header-spacer {
    min-width: 80px;
  }

  /* Group mute/solo horizontally */
  .track-header .track-mute,
  .track-header .track-solo {
    display: inline-flex;
  }

  .track-volume {
    width: 70px;
  }
}

@media (max-width: 480px) {
  .seq-transport {
    gap: var(--space-md);
  }

  .seq-play-btn {
    width: 50px;
    height: 50px;
    font-size: 1.2rem;
  }

  .sound-slots {
    grid-template-columns: repeat(4, 1fr);
  }

  .sound-slot {
    min-height: 50px;
  }

  .step {
    width: 22px;
    height: 22px;
  }

  .step[data-step="4"],
  .step[data-step="8"],
  .step[data-step="12"] {
    margin-left: 3px;
  }

  .step-num-row span {
    width: 22px;
    font-size: 0.55rem;
  }

  .step-num-row span:nth-child(4n+5) {
    margin-left: 3px;
  }

  /* Compact track controls on phone */
  .track-header {
    min-width: 70px;
    padding: 3px;
  }

  .track-header-spacer {
    min-width: 70px;
  }

  .track-mute,
  .track-solo {
    width: 26px;
    height: 26px;
    font-size: 0.65rem;
    /* Better touch target */
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
  }

  .track-sound {
    width: 36px;
    font-size: 0.7rem;
    padding: 2px;
  }

  .track-volume {
    width: 60px;
    height: 24px;
  }
}