/**
 * Sampling Theory Explorer - Styles
 * Neobrutalism Design - Bold, raw, and playful
 */

/* ============================
   CSS Variables
   ============================ */

:root {
  --color-bg: #1a1a2e;
  --color-bg-alt: #16213e;
  --color-text: #ffffff;
  --color-text-secondary: #a0a0a0;
  --color-border: #000000;
  --color-border-light: #333333;

  /* Neobrutalism accent colors */
  --color-primary: #ffd93d;
  --color-secondary: #6bcb77;
  --color-tertiary: #4d96ff;
  --color-accent: #ff6b6b;
  --color-pink: #ff6b9d;
  --color-cyan: #00f5d4;

  --color-warning: #ff6b6b;
  --color-alert: #ffd93d;
  --color-success: #6bcb77;

  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;

  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;

  --panel-width: 360px;
  --toolbar-height: 60px;

  /* Neobrutalism specific */
  --border-width: 3px;
  --shadow-offset: 4px;
  --shadow: var(--shadow-offset) var(--shadow-offset) 0 #000;
  --shadow-hover: 6px 6px 0 #000;
  --shadow-active: 2px 2px 0 #000;
}

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

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

body {
  font-family: var(--font-primary);
  background-color: var(--color-bg);
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow: hidden;
}

/* ============================
   Utility Classes
   ============================ */

.hidden {
  display: none !important;
}

/* ============================
   Layout
   ============================ */

.app-layout {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* Side Panel */
.side-panel {
  width: var(--panel-width);
  background-color: var(--color-bg-alt);
  border-right: var(--border-width) solid var(--color-border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overflow-x: hidden;
}

.side-panel::-webkit-scrollbar {
  width: 8px;
}

.side-panel::-webkit-scrollbar-track {
  background: var(--color-bg);
}

.side-panel::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border: 2px solid var(--color-border);
}

.side-panel::-webkit-scrollbar-thumb:hover {
  background: var(--color-secondary);
}

.panel-header {
  position: relative;
  padding: var(--spacing-lg);
  border-bottom: var(--border-width) solid var(--color-border);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-alert) 100%);
  color: #000;
}

.panel-title {
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 1px;
  line-height: 1.2;
  margin-bottom: var(--spacing-xs);
  text-transform: uppercase;
}

.panel-subtitle {
  font-size: 11px;
  color: #333;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  font-weight: 700;
}

.panel-footer {
  margin-top: auto;
  padding: var(--spacing-md);
  border-top: var(--border-width) solid var(--color-border);
  background-color: var(--color-bg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

/* Main Content */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overflow-x: hidden;
  background-color: var(--color-bg);
}

.toolbar {
  height: var(--toolbar-height);
  border-bottom: var(--border-width) solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-lg);
  background-color: var(--color-bg-alt);
}

.toolbar-left {
  display: flex;
  align-items: center;
}

.toolbar-title {
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-primary);
}

.toolbar-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.coffee-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background-color: var(--color-primary);
  color: #000;
  text-decoration: none;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.5px;
  border: var(--border-width) solid var(--color-border);
  box-shadow: var(--shadow);
  transition: all 0.1s ease;
}

.coffee-link:hover {
  background-color: var(--color-secondary);
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hover);
}

.coffee-link:active {
  transform: translate(2px, 2px);
  box-shadow: var(--shadow-active);
}

.coffee-icon {
  width: 16px;
  height: 16px;
}

.zoom-label {
  font-size: 11px;
  letter-spacing: 0.5px;
  color: var(--color-text-secondary);
  margin-right: var(--spacing-xs);
  font-weight: 700;
  text-transform: uppercase;
}

.zoom-btn {
  background-color: var(--color-tertiary);
  color: #000;
  border: var(--border-width) solid var(--color-border);
  padding: 6px 14px;
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
  transition: all 0.1s ease;
  font-family: var(--font-primary);
  box-shadow: var(--shadow);
}

.zoom-btn:hover {
  box-shadow: var(--shadow-hover);
  transform: translate(-2px, -2px);
}

.zoom-btn:active {
  box-shadow: var(--shadow-active);
  transform: translate(2px, 2px);
}

.zoom-value {
  font-size: 13px;
  color: var(--color-text);
  min-width: 40px;
  text-align: center;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  background-color: var(--color-bg);
  padding: 4px 8px;
  border: var(--border-width) solid var(--color-border);
  box-shadow: var(--shadow);
}

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

.controls {
  padding: var(--spacing-lg) var(--spacing-md);
}

.section-title {
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 2px;
  margin-bottom: var(--spacing-md);
  text-transform: uppercase;
  color: var(--color-primary);
  padding-bottom: var(--spacing-xs);
  border-bottom: 3px solid var(--color-primary);
  display: inline-block;
}

.control-group {
  margin-bottom: var(--spacing-lg);
}

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

.frequency-value-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
}

.aliasing-warning {
  background-color: var(--color-accent);
  color: #000;
  border: 2px solid var(--color-border);
  width: 20px;
  height: 20px;
  font-size: 12px;
  font-weight: 900;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  box-shadow: 2px 2px 0 #000;
  animation: pulse-warning 0.8s ease-in-out infinite;
  cursor: help;
}

@keyframes pulse-warning {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

/* Aliasing state for frequency slider */
.slider.aliasing {
  background: var(--color-accent);
}

.slider.aliasing::-webkit-slider-thumb {
  background: var(--color-accent);
}

.slider.aliasing::-moz-range-thumb {
  background: var(--color-accent);
}

.control-label {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.control-label.small {
  font-size: 10px;
  opacity: 0.7;
}

.control-value {
  font-size: 14px;
  font-weight: 800;
  color: var(--color-cyan);
  font-variant-numeric: tabular-nums;
  background-color: var(--color-bg);
  padding: 2px 8px;
  border: 2px solid var(--color-border);
}

/* Editable Value Displays */
.editable-value {
  cursor: pointer;
  padding: 4px 8px;
  transition: all 0.1s ease;
  border: 2px solid var(--color-border);
  background-color: var(--color-bg);
}

.editable-value:hover {
  background-color: var(--color-primary);
  color: #000;
  box-shadow: var(--shadow);
  transform: translate(-2px, -2px);
}

.editable-value.editing {
  background-color: var(--color-cyan);
  border-color: var(--color-border);
  color: #000;
}

/* Inline edit input */
.value-edit-input {
  background-color: var(--color-primary);
  border: var(--border-width) solid var(--color-border);
  color: #000;
  font-size: 14px;
  font-weight: 800;
  font-family: var(--font-primary);
  font-variant-numeric: tabular-nums;
  padding: 4px 8px;
  width: 90px;
  text-align: right;
  outline: none;
}

.value-edit-input:focus {
  background-color: var(--color-cyan);
}

.value-edit-input.invalid {
  background-color: var(--color-warning);
  color: #000;
}

.control-info {
  margin-top: 4px;
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.info-text {
  font-size: 10px;
  color: var(--color-text-secondary);
  font-weight: 600;
}

.info-text.small {
  font-size: 9px;
  line-height: 1.3;
}

/* Sliders */
.slider {
  -webkit-appearance: none;
  width: 100%;
  height: 12px;
  background: var(--color-bg);
  outline: none;
  cursor: pointer;
  border: var(--border-width) solid var(--color-border);
}

.frequency-slider {
  margin-bottom: var(--spacing-sm);
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  background: var(--color-primary);
  cursor: pointer;
  border: var(--border-width) solid var(--color-border);
  box-shadow: var(--shadow);
  transition: all 0.1s ease;
}

.slider::-webkit-slider-thumb:hover {
  background: var(--color-secondary);
  transform: scale(1.1);
}

.slider::-moz-range-thumb {
  width: 24px;
  height: 24px;
  background: var(--color-primary);
  cursor: pointer;
  border: var(--border-width) solid var(--color-border);
  box-shadow: var(--shadow);
  transition: all 0.1s ease;
}

.slider::-moz-range-thumb:hover {
  background: var(--color-secondary);
  transform: scale(1.1);
}

/* Select Inputs */
.select-input {
  width: 100%;
  background-color: var(--color-bg);
  color: var(--color-text);
  border: var(--border-width) solid var(--color-border);
  padding: 10px 14px;
  font-size: 13px;
  font-weight: 700;
  font-family: var(--font-primary);
  cursor: pointer;
  transition: all 0.1s ease;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L6 6L11 1' stroke='%23000' stroke-width='3' stroke-linecap='square'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
  box-shadow: var(--shadow);
}

.select-input:hover {
  background-color: var(--color-primary);
  color: #000;
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hover);
}

.select-input:focus {
  outline: none;
  background-color: var(--color-primary);
  color: #000;
}

.select-input option {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-weight: 700;
}

/* Button Groups */
.button-group {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.button-group-compact {
  gap: 4px;
}

button {
  background-color: var(--color-bg);
  color: var(--color-text);
  border: var(--border-width) solid var(--color-border);
  padding: 10px 16px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: all 0.1s ease;
  font-family: var(--font-primary);
  text-transform: uppercase;
  box-shadow: var(--shadow);
}

button:hover {
  background-color: var(--color-primary);
  color: #000;
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hover);
}

button:active {
  transform: translate(2px, 2px);
  box-shadow: var(--shadow-active);
}

button.active {
  background-color: var(--color-primary);
  color: #000;
  border-color: var(--color-border);
}

.preset-btn {
  flex: 1;
  min-width: 0;
  padding: 10px 6px;
}

/* Waveform Buttons */
.waveform-buttons {
  display: flex;
  gap: 8px;
}

.waveform-btn {
  flex: 1;
  padding: 12px 10px;
  background-color: var(--color-bg);
  border: var(--border-width) solid var(--color-border);
  color: var(--color-text);
  cursor: pointer;
  transition: all 0.1s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
}

.waveform-btn:hover {
  background-color: var(--color-secondary);
  color: #000;
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hover);
}

.waveform-btn:active {
  transform: translate(2px, 2px);
  box-shadow: var(--shadow-active);
}

.waveform-btn.active {
  background-color: var(--color-secondary);
  color: #000;
  border-color: var(--color-border);
}

.waveform-icon {
  width: 32px;
  height: 16px;
}

/* Frequency Presets */
.frequency-presets {
  display: flex;
  gap: 4px;
  margin-top: var(--spacing-xs);
}

.frequency-preset-btn {
  flex: 1;
  min-width: 0;
  padding: 8px 6px;
  font-size: 11px;
  font-weight: 800;
  background-color: var(--color-bg);
  border: var(--border-width) solid var(--color-border);
  color: var(--color-text);
  transition: all 0.1s ease;
  box-shadow: 3px 3px 0 #000;
}

.frequency-preset-btn:hover {
  background-color: var(--color-pink);
  color: #000;
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hover);
}

.frequency-preset-btn:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 #000;
}

.frequency-preset-btn.active {
  background-color: var(--color-pink);
  color: #000;
  border-color: var(--color-border);
}

/* Sample Rate Presets */
.sample-rate-presets {
  display: flex;
  gap: 4px;
  margin-top: var(--spacing-xs);
}

.sample-rate-preset-btn {
  flex: 1;
  min-width: 0;
  padding: 8px 6px;
  font-size: 11px;
  font-weight: 800;
  background-color: var(--color-bg);
  border: var(--border-width) solid var(--color-border);
  color: var(--color-text);
  transition: all 0.1s ease;
  box-shadow: 3px 3px 0 #000;
}

.sample-rate-preset-btn:hover {
  background-color: var(--color-tertiary);
  color: #000;
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hover);
}

.sample-rate-preset-btn:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 #000;
}

.sample-rate-preset-btn.active {
  background-color: var(--color-tertiary);
  color: #000;
  border-color: var(--color-border);
}

/* Playback Controls */
.playback-buttons {
  display: flex;
  gap: var(--spacing-sm);
}

.playback-btn {
  flex: 1;
  background-color: var(--color-bg);
  color: var(--color-text);
  border: var(--border-width) solid var(--color-border);
  padding: 12px 14px;
  font-size: 12px;
  font-weight: 800;
  cursor: pointer;
  transition: all 0.1s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  box-shadow: var(--shadow);
}

.playback-btn:hover {
  background-color: var(--color-success);
  color: #000;
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hover);
}

.playback-btn:active {
  transform: translate(2px, 2px);
  box-shadow: var(--shadow-active);
}

.playback-btn.playing {
  background-color: var(--color-accent);
  color: #000;
  border-color: var(--color-border);
  animation: pulse 1s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.8; }
}

.playback-btn.playing:hover {
  background-color: var(--color-warning);
}

.playback-btn .play-icon {
  font-size: 12px;
}

/* Info Buttons */
.info-btn {
  background-color: var(--color-tertiary);
  color: #000;
  border: 2px solid var(--color-border);
  width: 20px;
  height: 20px;
  font-size: 11px;
  font-weight: 900;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.1s ease;
  padding: 0;
  line-height: 1;
  box-shadow: 2px 2px 0 #000;
}

.info-btn:hover {
  background-color: var(--color-primary);
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0 #000;
}

.reset-button {
  width: 100%;
  padding: 12px;
  background-color: var(--color-bg);
  color: var(--color-text);
  border: var(--border-width) solid var(--color-border);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: all 0.1s ease;
  box-shadow: var(--shadow);
}

.reset-button:hover {
  background-color: var(--color-warning);
  color: #000;
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hover);
}

.reset-button:active {
  transform: translate(2px, 2px);
  box-shadow: var(--shadow-active);
}

.help-button {
  width: 100%;
  padding: 14px;
  background-color: var(--color-primary);
  color: #000;
  border: var(--border-width) solid var(--color-border);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 1px;
  cursor: pointer;
  transition: all 0.1s ease;
  box-shadow: var(--shadow);
}

.help-button:hover {
  background-color: var(--color-secondary);
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hover);
}

.help-button:active {
  transform: translate(2px, 2px);
  box-shadow: var(--shadow-active);
}

/* ============================
   Visualizations
   ============================ */

.viz-grid {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-lg);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--spacing-lg);
  align-content: start;
}

.viz-card {
  background-color: var(--color-bg-alt);
  border: var(--border-width) solid var(--color-border);
  padding: var(--spacing-md);
  padding-bottom: calc(var(--spacing-md) + 8px);
  min-height: 200px;
  height: fit-content;
  box-shadow: 6px 6px 0 #000;
}

.viz-card-wide {
  grid-column: 1 / -1;
}

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

.viz-title {
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--color-primary);
}

.viz-title span {
  color: var(--color-text);
  font-weight: 700;
}

.waveform-canvas {
  width: 100%;
  height: 150px;
  display: block;
  background-color: var(--color-bg);
  border: var(--border-width) solid var(--color-border);
}

.spectrum-canvas {
  width: 100%;
  height: 220px;
  display: block;
  background-color: var(--color-bg);
  border: var(--border-width) solid var(--color-border);
}

/* Unified Canvas */
.unified-canvas {
  width: 100%;
  height: 350px;
  display: block;
  background-color: var(--color-bg);
  border: var(--border-width) solid var(--color-border);
}

/* Layer Toggle Buttons */
.layer-toggles {
  display: flex;
  gap: 4px;
  margin-left: auto;
  margin-right: var(--spacing-sm);
}

.layer-toggle {
  background-color: var(--color-bg);
  color: var(--color-text);
  border: 2px solid var(--color-border);
  padding: 5px 12px;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: all 0.1s ease;
  text-transform: uppercase;
  box-shadow: 2px 2px 0 #000;
}

.layer-toggle u {
  text-decoration: underline;
  text-underline-offset: 2px;
}

.layer-toggle:hover {
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0 #000;
}

.layer-toggle.active {
  color: #000;
  box-shadow: 2px 2px 0 #000;
}

/* Color-coded active states for layer toggles */
.layer-toggle[data-layer="analog"].active {
  background-color: #fff;
  border-color: var(--color-border);
}

.layer-toggle[data-layer="reconstructed"].active {
  background-color: #6bcb77;
  border-color: var(--color-border);
}

.layer-toggle[data-layer="samplePoints"].active {
  background-color: #00f5d4;
  border-color: var(--color-border);
}

.layer-toggle[data-layer="quantized"].active {
  background-color: #ffd93d;
  border-color: var(--color-border);
}

.layer-toggle[data-layer="error"].active {
  background-color: #ff6b6b;
  border-color: var(--color-border);
}

/* Spectrum Mode Toggle Buttons */
.spectrum-mode-toggles {
  display: flex;
  gap: 4px;
  margin-left: var(--spacing-sm);
}

.spectrum-mode-toggle {
  background-color: var(--color-bg);
  color: var(--color-text);
  border: 2px solid var(--color-border);
  padding: 5px 12px;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: all 0.1s ease;
  text-transform: uppercase;
  box-shadow: 2px 2px 0 #000;
}

.spectrum-mode-toggle:hover {
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0 #000;
}

.spectrum-mode-toggle.active {
  color: #000;
}

.spectrum-mode-toggle[data-mode="analog"].active {
  background-color: #fff;
  border-color: var(--color-border);
}

.spectrum-mode-toggle[data-mode="sampled"].active {
  background-color: #ffd93d;
  border-color: var(--color-border);
}

/* Viz Stats Bar */
.viz-stats {
  display: flex;
  gap: var(--spacing-md);
  padding: var(--spacing-sm) 0;
  font-size: 11px;
  color: var(--color-text-secondary);
  align-items: center;
  font-weight: 700;
}

.stat-divider {
  color: var(--color-border);
}

.waveform-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--spacing-sm);
}

.waveform-zoom-controls {
  display: flex;
  align-items: center;
  gap: 4px;
}

.spectrum-controls {
  display: flex;
  gap: var(--spacing-md);
  margin-left: auto;
  margin-right: var(--spacing-md);
}

.radio-label {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  color: var(--color-text);
  cursor: pointer;
  font-weight: 700;
}

.radio-label input[type="radio"] {
  cursor: pointer;
  accent-color: var(--color-primary);
  width: 16px;
  height: 16px;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  color: var(--color-text);
  cursor: pointer;
  font-weight: 700;
}

.checkbox-label input[type="checkbox"] {
  cursor: pointer;
  accent-color: var(--color-success);
  width: 16px;
  height: 16px;
}

.control-divider {
  color: var(--color-border);
  margin: 0 4px;
}

.spectrum-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--spacing-sm);
}

.nyquist-info {
  font-size: 11px;
  color: var(--color-cyan);
  font-weight: 700;
  background-color: var(--color-bg);
  padding: 4px 8px;
  border: 2px solid var(--color-border);
}

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

/* Warning Messages */
.warning {
  margin: var(--spacing-md) var(--spacing-lg);
  padding: var(--spacing-md);
  background-color: var(--color-warning);
  border: var(--border-width) solid var(--color-border);
  color: #000;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.3px;
  box-shadow: var(--shadow);
}

/* ============================
   Tooltip
   ============================ */

.tooltip {
  position: fixed;
  background-color: var(--color-primary);
  border: var(--border-width) solid var(--color-border);
  padding: var(--spacing-md);
  max-width: 300px;
  z-index: 1000;
  pointer-events: none;
  opacity: 1;
  transition: opacity 0.15s ease;
  box-shadow: 6px 6px 0 #000;
  color: #000;
}

.tooltip.hidden {
  opacity: 0;
  pointer-events: none;
}

.tooltip-title {
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.5px;
  margin-bottom: var(--spacing-xs);
  text-transform: uppercase;
}

.tooltip-content {
  font-size: 12px;
  line-height: 1.5;
  color: #333;
  font-weight: 600;
}

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

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  padding: var(--spacing-lg);
}

.modal {
  background-color: var(--color-bg-alt);
  border: var(--border-width) solid var(--color-border);
  max-width: 700px;
  max-height: 80vh;
  overflow-y: auto;
  padding: var(--spacing-xxl);
  position: relative;
  box-shadow: 12px 12px 0 #000;
}

.modal-close {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  background: var(--color-warning);
  border: var(--border-width) solid var(--color-border);
  color: #000;
  font-size: 20px;
  width: 36px;
  height: 36px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  padding: 0;
  box-shadow: 3px 3px 0 #000;
  font-weight: 900;
}

.modal-close:hover {
  background-color: var(--color-accent);
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 #000;
}

.modal-close:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 #000;
}

.modal-title {
  font-size: 24px;
  font-weight: 900;
  letter-spacing: 2px;
  margin-bottom: var(--spacing-lg);
  text-transform: uppercase;
  color: var(--color-primary);
  padding-bottom: var(--spacing-sm);
  border-bottom: 4px solid var(--color-primary);
  display: inline-block;
}

.modal-content {
  font-size: 14px;
  line-height: 1.7;
}

.help-section {
  margin-bottom: var(--spacing-xl);
}

.help-section h3 {
  font-size: 15px;
  font-weight: 900;
  letter-spacing: 1px;
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  color: var(--color-secondary);
}

.help-section ul,
.help-section ol {
  margin-left: var(--spacing-lg);
  color: var(--color-text-secondary);
}

.help-section li {
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
}

.help-section strong {
  color: var(--color-text);
}

/* ============================
   View Toggles
   ============================ */

.view-toggles {
  display: flex;
  gap: 6px;
}

.view-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background-color: var(--color-bg);
  border: var(--border-width) solid var(--color-border);
  color: var(--color-text);
  font-size: 12px;
  font-weight: 800;
  cursor: pointer;
  transition: all 0.1s ease;
  white-space: nowrap;
  box-shadow: var(--shadow);
}

.view-toggle:hover {
  background-color: var(--color-secondary);
  color: #000;
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hover);
}

.view-toggle:active {
  transform: translate(2px, 2px);
  box-shadow: var(--shadow-active);
}

.view-toggle.active {
  background-color: var(--color-secondary);
  color: #000;
  border-color: var(--color-border);
}

.view-icon {
  font-size: 14px;
}

.view-label {
  font-size: 12px;
}

.viz-card.hidden {
  display: none;
}

/* ============================
   Mobile Header & Hamburger
   ============================ */

.mobile-header {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 56px;
  background-color: var(--color-bg-alt);
  border-bottom: var(--border-width) solid var(--color-border);
  z-index: 1000;
  align-items: center;
  padding: 0 16px;
}

.hamburger-btn {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: var(--color-primary);
  border: var(--border-width) solid var(--color-border);
  cursor: pointer;
  padding: 8px;
  box-shadow: 3px 3px 0 #000;
}

.hamburger-btn span {
  display: block;
  width: 100%;
  height: 3px;
  background-color: #000;
  transition: all 0.3s ease;
}

.hamburger-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger-btn.active span:nth-child(2) {
  opacity: 0;
}

.hamburger-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

.mobile-title {
  font-size: 16px;
  font-weight: 900;
  letter-spacing: 2px;
  margin-left: 16px;
  color: var(--color-primary);
}

.close-sidebar-btn {
  display: none;
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  background: var(--color-warning);
  border: var(--border-width) solid var(--color-border);
  color: #000;
  font-size: 20px;
  cursor: pointer;
  justify-content: center;
  align-items: center;
  font-weight: 900;
  box-shadow: 3px 3px 0 #000;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.7);
  z-index: 999;
}

.sidebar-overlay.active {
  display: block;
}

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

@media (max-width: 1400px) {
  .viz-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 900px) {
  :root {
    --panel-width: 280px;
  }

  .panel-title {
    font-size: 18px;
  }

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

/* Mobile breakpoint */
@media (max-width: 768px) {
  .mobile-header {
    display: flex;
  }

  .close-sidebar-btn {
    display: flex;
  }

  html, body {
    height: auto;
    overflow: auto;
    overflow-x: hidden;
  }

  .app-layout {
    display: block;
    height: auto;
    min-height: 100vh;
    overflow: visible;
  }

  .side-panel {
    position: fixed;
    top: 0;
    left: -320px;
    width: 320px;
    height: 100vh;
    z-index: 1001;
    transition: left 0.3s ease;
    overflow-y: auto;
  }

  .side-panel.open {
    left: 0;
  }

  .main-content {
    margin-left: 0;
    padding-top: 72px;
    padding-bottom: 20px;
    min-height: auto;
    overflow: visible;
    display: block;
  }

  .viz-grid {
    flex: none;
    overflow: visible;
  }

  .toolbar {
    height: auto;
    padding: 8px 16px;
    justify-content: center;
  }

  .waveform-footer,
  .spectrum-footer {
    flex-direction: column;
    gap: 8px;
    align-items: center;
  }

  .waveform-zoom-controls,
  .spectrum-zoom-controls {
    justify-content: center;
  }

  .zoom-label {
    display: none;
  }

  .viz-header {
    flex-wrap: wrap;
    gap: 8px;
  }

  .layer-toggles {
    order: 3;
    width: 100%;
    justify-content: center;
  }

  .spectrum-controls {
    flex-wrap: wrap;
    justify-content: center;
  }

  .spectrum-footer {
    flex-direction: column;
    gap: 8px;
  }

  /* Make canvases shorter on mobile */
  .unified-canvas {
    height: 250px;
  }

  .spectrum-canvas {
    height: 200px;
  }

  .viz-card {
    margin-bottom: 16px;
    box-shadow: 4px 4px 0 #000;
  }
}

/* Small mobile */
@media (max-width: 480px) {
  .frequency-presets,
  .sample-rate-presets {
    flex-wrap: wrap;
  }

  .frequency-preset-btn,
  .sample-rate-preset-btn {
    flex: 0 0 auto;
    min-width: 40px;
  }

  .playback-buttons {
    flex-direction: column;
  }

  .layer-toggles {
    flex-wrap: wrap;
  }

  .layer-toggle {
    font-size: 10px;
    padding: 4px 8px;
  }
}