/* GM3 & Modern Audio Slider Style Explorer — Tonal Stylesheet (BillSkill Compliant)
   - Canonical --md-sys-color-* tokens only (zero hardcoded hex/rgb)
   - Split layout: Scrollable Style Options on Left + Fixed/Sticky Live Demo Panel on Right
   - Zero card perimeter borders, zero resting box-shadows
   - Google Sans Flex for headings/primary CTA, Inter for UI controls (<15px) */

/* ============================================================================
   SPLIT WORKSPACE LAYOUT: OPTIONS ON LEFT, FIXED DEMO PANEL ON RIGHT
   ============================================================================ */
.slider-explorer-workspace {
  width: 100%;
  max-width: 1440px;
  margin: 0 auto;
  padding: 8px 24px 36px;
}

.explorer-split-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  gap: 20px;
  align-items: start;
  min-width: 0;
}

.options-left-column {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
}

.demo-right-panel {
  position: sticky;
  top: 68px;
  max-height: calc(100vh - 84px);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
  scrollbar-width: thin;
  scrollbar-color: var(--md-sys-color-outline-variant) transparent;
}

.demo-right-panel::-webkit-scrollbar {
  width: 6px;
}

.demo-right-panel::-webkit-scrollbar-thumb {
  background-color: var(--md-sys-color-outline-variant);
  border-radius: 9999px;
}

/* Top Filter & Density Toolbar on Left Column */
.options-toolbar-card {
  background-color: var(--md-sys-color-surface-container-lowest);
  border-radius: 20px;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.toolbar-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--md-sys-color-on-surface-variant);
  white-space: nowrap;
}

/* ============================================================================
   LEFT COLUMN: SLIDER STYLE OPTION CARDS
   ============================================================================ */
.slider-options-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.slider-option-card {
  background-color: var(--md-sys-color-surface-container-lowest);
  border-radius: 24px;
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  cursor: pointer;
  transition: transform 0.18s cubic-bezier(0, 0, 0.2, 1), background-color 0.15s ease;
}

@media (hover: hover) {
  .slider-option-card:hover {
    transform: translateY(-2px);
  }
}

.slider-option-card.is-selected-style {
  background-color: var(--md-sys-color-surface-container-high);
}

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

.option-title-cluster {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.option-name {
  font-family: var(--md-ref-typeface-brand);
  font-size: 15.5px;
  font-weight: 600;
  color: var(--md-sys-color-on-surface);
  margin: 0;
}

.option-origin-meta {
  font-size: 12.5px;
  color: var(--md-sys-color-on-surface-variant);
  margin: 0;
  line-height: 1.45;
}

/* Specimen Box inside each Option Card (mirrors the 2-up Cutoff + Resonance layout) */
.option-specimen-box {
  background-color: var(--md-sys-color-surface-container-low);
  border-radius: 16px;
  padding: 16px 20px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  align-items: center;
}

.slider-option-card.is-selected-style .option-specimen-box {
  background-color: var(--md-sys-color-surface-container-lowest);
}

.option-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
}

/* ============================================================================
   RIGHT COLUMN: FIXED / STICKY LIVE DEMO PANEL
   ============================================================================ */
.demo-panel-card {
  background-color: var(--md-sys-color-surface-container-lowest);
  border-radius: 24px;
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.demo-surface-box {
  background-color: var(--md-sys-color-surface-container);
  border-radius: 16px;
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.demo-surface-box.on-white-surface {
  background-color: var(--md-sys-color-surface-container-lowest);
}

.demo-filter-response-box {
  width: 100%;
  height: 84px;
  border-radius: 12px;
  background-color: var(--md-sys-color-surface-container-low);
  overflow: hidden;
  position: relative;
}

.demo-surface-box:not(.on-white-surface) .demo-filter-response-box {
  background-color: var(--md-sys-color-surface-container-lowest);
}

#demo-filter-canvas,
#demo-envelope-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.demo-pair-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  align-items: center;
}

.demo-xy-row {
  display: grid;
  grid-template-columns: 132px 1fr;
  gap: 16px;
  align-items: center;
}

.demo-xy-pad {
  position: relative;
  width: 132px;
  height: 132px;
  border-radius: 14px;
  background-color: var(--md-sys-color-surface-container-high);
  cursor: pointer;
  overflow: hidden;
  touch-action: none;
}

.demo-xy-stack {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

.css-recipe-pre {
  margin: 0;
  padding: 14px 16px;
  border-radius: 12px;
  background-color: var(--md-sys-color-surface-container);
  color: var(--md-sys-color-on-surface);
  font-family: monospace;
  font-size: 12px;
  line-height: 1.5;
  overflow-x: auto;
}

/* ============================================================================
   SHARED SLIDER SIZE TOKENS (.slider-size-compact, .slider-size-std, .slider-size-expressive)
   ============================================================================ */
.slider-scope,
body {
  --trk-h: 6px;
  --trk-thick-h: 14px;
  --trk-bar-h: 18px;
  --trk-inline-h: 30px;
  --thumb-bar-h: 22px;
  --thumb-dot: 16px;
}

.slider-size-compact {
  --trk-h: 4px;
  --trk-thick-h: 10px;
  --trk-bar-h: 14px;
  --trk-inline-h: 26px;
  --thumb-bar-h: 18px;
  --thumb-dot: 14px;
}

.slider-size-std {
  --trk-h: 6px;
  --trk-thick-h: 14px;
  --trk-bar-h: 18px;
  --trk-inline-h: 30px;
  --thumb-bar-h: 22px;
  --thumb-dot: 16px;
}

.slider-size-expressive {
  --trk-h: 8px;
  --trk-thick-h: 18px;
  --trk-bar-h: 22px;
  --trk-inline-h: 34px;
  --thumb-bar-h: 26px;
  --thumb-dot: 18px;
}

/* Reset base for all custom GM3 slider styles (except legacy baseline) */
.slider-style-gm3-handle-bar input[type="range"],
.slider-style-gm3-thick-track input[type="range"],
.slider-style-aistudio-slim input[type="range"],
.slider-style-tonal-fill-bar input[type="range"],
.slider-style-inline-meter-bar input[type="range"],
.slider-style-gm3-stepped-ticks input[type="range"],
.slider-style-studio-fader-cap input[type="range"],
.slider-style-tonal-pill-thumb input[type="range"],
.slider-style-precision-ring input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  margin: 4px 0;
  border: none;
  outline: none;
  cursor: pointer;
  background: transparent;
}

/* ============================================================================
   STYLE 01: GM3 Expressive Vertical Handle Bar + Split Track (Recommended)
   - Official Material 3 Expressive slider: 4px vertical handle bar with 6px
     breathing gap between active primary track and inactive tonal track
   ============================================================================ */
.slider-style-gm3-handle-bar input[type="range"] {
  height: var(--trk-h);
  border-radius: 9999px;
  background: linear-gradient(
    to right,
    var(--md-sys-color-primary) 0%,
    var(--md-sys-color-primary) calc(var(--pct, 50%) - 6px),
    transparent calc(var(--pct, 50%) - 6px),
    transparent calc(var(--pct, 50%) + 6px),
    var(--md-sys-color-surface-container-highest) calc(var(--pct, 50%) + 6px),
    var(--md-sys-color-surface-container-highest) 100%
  );
}

.slider-style-gm3-handle-bar input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 4px;
  height: var(--thumb-bar-h);
  border-radius: 9999px;
  background-color: var(--md-sys-color-primary);
  border: none;
  transition: transform 0.15s ease, width 0.15s ease;
}

.slider-style-gm3-handle-bar input[type="range"]:hover::-webkit-slider-thumb,
.slider-style-gm3-handle-bar input[type="range"]:active::-webkit-slider-thumb {
  transform: scaleY(1.12);
  width: 5px;
}

.slider-style-gm3-handle-bar input[type="range"]::-moz-range-thumb {
  width: 4px;
  height: var(--thumb-bar-h);
  border-radius: 9999px;
  background-color: var(--md-sys-color-primary);
  border: none;
}

/* ============================================================================
   STYLE 02: GM3 Expressive Thick Track (14px) + Split Handle Bar
   - Bold Material 3 Expressive volume/parameter bar with light-blue active
     fill (primary-container) and crisp primary vertical bar handle
   ============================================================================ */
.slider-style-gm3-thick-track input[type="range"] {
  height: var(--trk-thick-h);
  border-radius: 8px;
  background: linear-gradient(
    to right,
    var(--md-sys-color-primary-container) 0%,
    var(--md-sys-color-primary-container) calc(var(--pct, 50%) - 6px),
    transparent calc(var(--pct, 50%) - 6px),
    transparent calc(var(--pct, 50%) + 6px),
    var(--md-sys-color-surface-container-highest) calc(var(--pct, 50%) + 6px),
    var(--md-sys-color-surface-container-highest) 100%
  );
}

.slider-style-gm3-thick-track input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 4px;
  height: calc(var(--trk-thick-h) + 8px);
  border-radius: 9999px;
  background-color: var(--md-sys-color-primary);
  border: none;
  transition: transform 0.15s ease;
}

.slider-style-gm3-thick-track input[type="range"]:hover::-webkit-slider-thumb {
  transform: scaleY(1.1);
}

.slider-style-gm3-thick-track input[type="range"]::-moz-range-thumb {
  width: 4px;
  height: calc(var(--trk-thick-h) + 8px);
  border-radius: 9999px;
  background-color: var(--md-sys-color-primary);
  border: none;
}

/* ============================================================================
   STYLE 03: Soft Tonal Track + Solid Primary Pill Thumb
   - Matches the compact tonal pill button aesthetic: light-blue active track
     (primary-container), soft grey inactive track, compact stadium pill thumb
   ============================================================================ */
.slider-style-tonal-pill-thumb input[type="range"] {
  height: calc(var(--trk-h) + 2px);
  border-radius: 9999px;
  background: linear-gradient(
    to right,
    var(--md-sys-color-primary-container) 0%,
    var(--md-sys-color-primary-container) var(--pct, 50%),
    var(--md-sys-color-surface-container-highest) var(--pct, 50%),
    var(--md-sys-color-surface-container-highest) 100%
  );
}

.slider-style-tonal-pill-thumb input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 10px;
  border-radius: 9999px;
  background-color: var(--md-sys-color-primary);
  border: none;
  transition: transform 0.15s ease;
}

.slider-style-tonal-pill-thumb input[type="range"]:hover::-webkit-slider-thumb {
  transform: scale(1.12);
}

.slider-style-tonal-pill-thumb input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 10px;
  border-radius: 9999px;
  background-color: var(--md-sys-color-primary);
  border: none;
}

/* ============================================================================
   STYLE 04: Contained Tonal Fill Bar (No Protruding Knob — Ableton / Bitwig)
   - Self-contained 18px pill trough filled with primary-container light blue
     and a crisp 3px primary edge indicator inside the bar
   ============================================================================ */
.slider-style-tonal-fill-bar input[type="range"] {
  min-height: 40px;
  height: 40px;
  min-width: 40px;
  padding: 9px 0;
  box-sizing: border-box;
  background-clip: content-box;
  border-radius: 17px;
  overflow: hidden;
  background-image: linear-gradient(
    to right,
    var(--md-sys-color-primary-container) 0%,
    var(--md-sys-color-primary-container) var(--pct, 50%),
    var(--md-sys-color-surface-container-highest) var(--pct, 50%),
    var(--md-sys-color-surface-container-highest) 100%
  );
}

.slider-style-tonal-fill-bar input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 4px;
  height: 22px;
  border-radius: 2px;
  background-color: var(--md-sys-color-primary);
  border: none;
}

.slider-style-tonal-fill-bar input[type="range"]::-moz-range-thumb {
  width: 4px;
  height: 22px;
  border-radius: 2px;
  background-color: var(--md-sys-color-primary);
  border: none;
}

/* ============================================================================
   STYLE 05: Inline Label-Inside Tonal Meter Bar (Single-Row Synth Control)
   - Merges label ("Filter cutoff") and value ("2800 Hz") directly inside a
     single 30px draggable tonal bar, cutting vertical height in half
   ============================================================================ */
.slider-style-inline-meter-bar .control-row {
  position: relative;
  height: var(--trk-inline-h);
  border-radius: 8px;
  overflow: hidden;
  justify-content: center;
  gap: 0;
}

.slider-style-inline-meter-bar .control-label-line {
  position: absolute;
  inset: 0;
  padding: 0 12px;
  z-index: 2;
  pointer-events: none;
  color: var(--md-sys-color-on-surface);
  font-size: 12px;
  font-weight: 600;
}

.slider-style-inline-meter-bar .control-value {
  color: var(--md-sys-color-on-primary-container);
  font-size: 12px;
  font-weight: 700;
}

.slider-style-inline-meter-bar input[type="range"] {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  border-radius: 8px;
  z-index: 1;
  background: linear-gradient(
    to right,
    var(--md-sys-color-primary-container) 0%,
    var(--md-sys-color-primary-container) var(--pct, 50%),
    var(--md-sys-color-surface-container-high) var(--pct, 50%),
    var(--md-sys-color-surface-container-high) 100%
  );
}

.slider-style-inline-meter-bar input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 2px;
  height: var(--trk-inline-h);
  background-color: transparent;
  border: none;
}

.slider-style-inline-meter-bar input[type="range"]::-moz-range-thumb {
  width: 2px;
  height: var(--trk-inline-h);
  background-color: transparent;
  border: none;
}

/* ============================================================================
   STYLE 06: AI Studio / Material Web Clean Slim Track + Halo Thumb
   - Borderless 6px tonal track (zero browser outline) with a 16px primary
     thumb that expands a soft primary-container halo ring on hover
   ============================================================================ */
.slider-style-aistudio-slim input[type="range"] {
  height: var(--trk-h);
  border-radius: 9999px;
  background: linear-gradient(
    to right,
    var(--md-sys-color-primary) 0%,
    var(--md-sys-color-primary) var(--pct, 50%),
    var(--md-sys-color-surface-container-highest) var(--pct, 50%),
    var(--md-sys-color-surface-container-highest) 100%
  );
}

.slider-style-aistudio-slim input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: var(--thumb-dot);
  height: var(--thumb-dot);
  border-radius: 9999px;
  background-color: var(--md-sys-color-primary);
  border: 2px solid var(--md-sys-color-surface-container-lowest);
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.slider-style-aistudio-slim input[type="range"]:hover::-webkit-slider-thumb {
  transform: scale(1.15);
  border-color: var(--md-sys-color-primary-container);
}

.slider-style-aistudio-slim input[type="range"]::-moz-range-thumb {
  width: var(--thumb-dot);
  height: var(--thumb-dot);
  border-radius: 9999px;
  background-color: var(--md-sys-color-primary);
  border: 2px solid var(--md-sys-color-surface-container-lowest);
}

/* ============================================================================
   STYLE 07: Precision Hairline + Hollow Ring Thumb (Teenage Engineering / OP-1)
   - Minimal 4px track with a white-centered hollow primary ring thumb
   ============================================================================ */
.slider-style-precision-ring input[type="range"] {
  height: 4px;
  border-radius: 9999px;
  background: linear-gradient(
    to right,
    var(--md-sys-color-primary) 0%,
    var(--md-sys-color-primary) var(--pct, 50%),
    var(--md-sys-color-surface-container-highest) var(--pct, 50%),
    var(--md-sys-color-surface-container-highest) 100%
  );
}

.slider-style-precision-ring input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: var(--thumb-dot);
  height: var(--thumb-dot);
  border-radius: 9999px;
  background-color: var(--md-sys-color-surface-container-lowest);
  border: 3.5px solid var(--md-sys-color-primary);
  transition: transform 0.15s ease;
}

.slider-style-precision-ring input[type="range"]:hover::-webkit-slider-thumb {
  transform: scale(1.15);
}

.slider-style-precision-ring input[type="range"]::-moz-range-thumb {
  width: var(--thumb-dot);
  height: var(--thumb-dot);
  border-radius: 9999px;
  background-color: var(--md-sys-color-surface-container-lowest);
  border: 3.5px solid var(--md-sys-color-primary);
}

/* ============================================================================
   STYLE 08: Studio Hardware Fader Cap (Console / Synth Rack Slider)
   - Tactile rectangular fader cap with a 2px primary center calibration line
   ============================================================================ */
.slider-style-studio-fader-cap input[type="range"] {
  height: var(--trk-h);
  border-radius: 9999px;
  background: linear-gradient(
    to right,
    var(--md-sys-color-primary-container) 0%,
    var(--md-sys-color-primary-container) var(--pct, 50%),
    var(--md-sys-color-surface-container-highest) var(--pct, 50%),
    var(--md-sys-color-surface-container-highest) 100%
  );
}

.slider-style-studio-fader-cap input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 14px;
  border-radius: 4px;
  border: 1.5px solid var(--md-sys-color-primary);
  background: linear-gradient(
    to right,
    var(--md-sys-color-surface-container-lowest) 0%,
    var(--md-sys-color-surface-container-lowest) 42%,
    var(--md-sys-color-primary) 42%,
    var(--md-sys-color-primary) 58%,
    var(--md-sys-color-surface-container-lowest) 58%,
    var(--md-sys-color-surface-container-lowest) 100%
  );
  transition: transform 0.15s ease;
}

.slider-style-studio-fader-cap input[type="range"]:hover::-webkit-slider-thumb {
  transform: scale(1.08);
}

.slider-style-studio-fader-cap input[type="range"]::-moz-range-thumb {
  width: 22px;
  height: 14px;
  border-radius: 4px;
  border: 1.5px solid var(--md-sys-color-primary);
  background-color: var(--md-sys-color-surface-container-lowest);
}

/* ============================================================================
   STYLE 09: GM3 Discrete Stepped Track + Tick Dots
   - Material 3 stepped track with subtle 20% interval tick marks along the bar
   ============================================================================ */
.slider-style-gm3-stepped-ticks input[type="range"] {
  height: calc(var(--trk-h) + 2px);
  border-radius: 9999px;
  background-image:
    radial-gradient(circle, var(--md-sys-color-on-surface-variant) 1.5px, transparent 2px),
    linear-gradient(
      to right,
      var(--md-sys-color-primary-container) 0%,
      var(--md-sys-color-primary-container) var(--pct, 50%),
      var(--md-sys-color-surface-container-highest) var(--pct, 50%),
      var(--md-sys-color-surface-container-highest) 100%
    );
  background-size: 20% 100%, 100% 100%;
  background-position: center center, 0 0;
  background-repeat: repeat-x, no-repeat;
}

.slider-style-gm3-stepped-ticks input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 6px;
  height: var(--thumb-bar-h);
  border-radius: 9999px;
  background-color: var(--md-sys-color-primary);
  border: none;
  transition: transform 0.15s ease;
}

.slider-style-gm3-stepped-ticks input[type="range"]:hover::-webkit-slider-thumb {
  transform: scaleY(1.12);
}

.slider-style-gm3-stepped-ticks input[type="range"]::-moz-range-thumb {
  width: 6px;
  height: var(--thumb-bar-h);
  border-radius: 9999px;
  background-color: var(--md-sys-color-primary);
  border: none;
}

/* ============================================================================
   STYLE 10: Previous Baseline — Native Browser <input type="range">
   - Shown at bottom of options list for direct side-by-side comparison
   ============================================================================ */
.slider-style-legacy-native input[type="range"] {
  -webkit-appearance: auto;
  appearance: auto;
  width: 100%;
  height: 6px;
  accent-color: var(--md-sys-color-primary);
  background-color: var(--md-sys-color-surface-container-highest);
  border-radius: 9999px;
  cursor: pointer;
}

/* Responsive Breakpoints */
@media (max-width: 1040px) {
  .explorer-split-layout {
    grid-template-columns: 1fr;
  }
  .demo-right-panel {
    position: static;
    max-height: none;
    order: -1;
  }
}

@media (max-width: 640px) {
  .option-specimen-box,
  .demo-pair-grid,
  .demo-xy-row {
    grid-template-columns: 1fr;
  }
}