/* ============================================
   Fluid Simulation - Aurora Borealis Theme
   Pure CSS Dark Theme
   ============================================ */

/* --------------------------------------------
   1. CSS Custom Properties
   -------------------------------------------- */
:root {
  /* Color Palette - Aurora Borealis */
  --bg-void: #050510;
  --bg-surface: #0a0a1a;
  --bg-elevated: #12122a;
  --bg-overlay: rgba(10, 10, 26, 0.85);

  --color-primary: #00ff87;
  --color-secondary: #7c3aed;
  --color-accent: #00d4ff;
  --color-text: #e8e8f0;
  --color-text-muted: #8888a0;

  /* Gradients */
  --gradient-aurora: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-accent) 50%,
    var(--color-secondary) 100%
  );
  --gradient-glow: linear-gradient(
    90deg,
    var(--color-primary),
    var(--color-accent),
    var(--color-secondary)
  );

  /* Shadows */
  --shadow-soft: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 20px rgba(0, 255, 135, 0.5),
                 0 0 40px rgba(0, 212, 255, 0.3),
                 0 0 60px rgba(124, 58, 237, 0.2);
  --shadow-glow-primary: 0 0 12px rgba(0, 255, 135, 0.6);
  --shadow-glow-accent: 0 0 12px rgba(0, 212, 255, 0.6);
  --shadow-glow-secondary: 0 0 12px rgba(124, 58, 237, 0.6);

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
  --transition-bounce: 300ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, monospace;

  /* Z-Index Scale */
  --z-behind: -1;
  --z-base: 0;
  --z-elevated: 10;
  --z-overlay: 100;
  --z-modal: 1000;
}

/* --------------------------------------------
   2. Base Reset
   -------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
  width: 100%;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-void);
  color: var(--color-text);
  line-height: 1.5;
  overflow: hidden;
  user-select: none;
}

/* --------------------------------------------
   3. Canvas Layer
   -------------------------------------------- */
#fluid-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: var(--z-base);
  touch-action: none;
  cursor: crosshair;
  display: block;
}

/* --------------------------------------------
   4. Loading Overlay
   -------------------------------------------- */
.loading-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  background-color: var(--bg-void);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
  opacity: 1;
  visibility: visible;
  transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.loading-overlay.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loading-spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--bg-elevated);
  border-top-color: var(--color-primary);
  border-right-color: var(--color-accent);
  border-radius: var(--radius-full);
  animation: spin 1s linear infinite;
}

.loading-text {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

/* --------------------------------------------
   5. Hero Section
   -------------------------------------------- */
.hero {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: var(--z-elevated);
  text-align: center;
  pointer-events: none;
  user-select: none;
}

.hero-name {
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: rgba(255, 255, 255, 0.95);
  text-shadow:
    0 0 40px rgba(0, 0, 0, 0.8),
    0 0 80px rgba(0, 0, 0, 0.5);
  margin: 0 0 0.25em;
  line-height: 1.1;
}

.hero-title {
  font-size: clamp(1rem, 3vw, 1.5rem);
  font-weight: 300;
  color: rgba(255, 255, 255, 0.7);
  text-shadow: 0 0 20px rgba(0, 0, 0, 0.8);
  margin: 0 0 1.5em;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.hero-subtitle {
  font-size: clamp(0.7rem, 2vw, 0.9rem);
  font-weight: 300;
  color: rgba(255, 255, 255, 0.6);
  text-shadow: 0 0 15px rgba(0, 0, 0, 0.8);
  margin: -1em 0 1.5em;
  text-align: center;
  letter-spacing: 0.05em;
}

.hero-skills {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 2em;
}

.hero-skills span {
  padding: 0.35em 0.75em;
  font-size: 0.75rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.8);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  backdrop-filter: blur(4px);
  text-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

.hero-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 2em;
  pointer-events: auto;
}

.hero-links a {
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.hero-links a:hover {
  color: rgba(255, 255, 255, 1);
  transform: scale(1.15);
}

.hero-hint {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.7);
  text-transform: lowercase;
  letter-spacing: 0.15em;
  text-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.7; }
  50% { opacity: 1.0; }
}

/* Mobile adjustments for hero */
@media screen and (max-width: 600px) {
  .hero-skills {
    gap: 0.35rem;
  }

  .hero-skills span {
    font-size: 0.65rem;
    padding: 0.25em 0.5em;
  }
}

/* --------------------------------------------
   6. Control Panel
   -------------------------------------------- */
.control-panel {
  position: fixed;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
  z-index: var(--z-overlay);

  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);

  padding: var(--space-md) var(--space-xl);
  background: var(--bg-overlay);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-soft),
              inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.control-panel .hint {
  width: 100%;
  text-align: center;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-bottom: calc(-1 * var(--space-sm));
}

.control-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
}

.control-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* --------------------------------------------
   6. Custom Range Slider
   -------------------------------------------- */
.slider {
  -webkit-appearance: none;
  appearance: none;
  width: 120px;
  height: 6px;
  background: var(--gradient-glow);
  border-radius: var(--radius-full);
  outline: none;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.slider:hover {
  transform: scaleY(1.2);
}

/* WebKit (Chrome, Safari, Edge) */
.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  background: var(--color-text);
  border: 2px solid var(--bg-void);
  border-radius: var(--radius-full);
  cursor: grab;
  box-shadow: var(--shadow-glow-primary);
  transition: transform var(--transition-bounce),
              box-shadow var(--transition-fast);
}

.slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
  box-shadow: var(--shadow-glow);
}

.slider::-webkit-slider-thumb:active {
  cursor: grabbing;
  transform: scale(1.25);
}

/* Firefox */
.slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: var(--color-text);
  border: 2px solid var(--bg-void);
  border-radius: var(--radius-full);
  cursor: grab;
  box-shadow: var(--shadow-glow-primary);
  transition: transform var(--transition-bounce),
              box-shadow var(--transition-fast);
}

.slider::-moz-range-thumb:hover {
  transform: scale(1.15);
  box-shadow: var(--shadow-glow);
}

.slider::-moz-range-thumb:active {
  cursor: grabbing;
  transform: scale(1.25);
}

.slider::-moz-range-track {
  background: var(--gradient-glow);
  height: 6px;
  border-radius: var(--radius-full);
}

/* --------------------------------------------
   7. Toggle Switch
   -------------------------------------------- */
.toggle {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 26px;
}

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

.toggle-track {
  position: absolute;
  inset: 0;
  background: var(--bg-elevated);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background var(--transition-base),
              border-color var(--transition-base),
              box-shadow var(--transition-base);
}

.toggle-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  background: var(--color-text-muted);
  border-radius: var(--radius-full);
  transition: transform var(--transition-bounce),
              background var(--transition-base),
              box-shadow var(--transition-base);
}

/* Toggle checked state */
.toggle input:checked + .toggle-track {
  background: var(--gradient-aurora);
  border-color: transparent;
  box-shadow: var(--shadow-glow-primary);
}

.toggle input:checked + .toggle-track .toggle-thumb {
  transform: translateX(22px);
  background: var(--color-text);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

/* Toggle focus state */
.toggle input:focus-visible + .toggle-track {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Toggle hover state */
.toggle:hover .toggle-track {
  border-color: rgba(255, 255, 255, 0.2);
}

.toggle:hover .toggle-thumb {
  background: var(--color-text);
}

/* --------------------------------------------
   8. Value Display
   -------------------------------------------- */
.value-display {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--color-primary);
  min-width: 3ch;
  text-align: center;
  text-shadow: 0 0 8px rgba(0, 255, 135, 0.4);
}

/* --------------------------------------------
   9. Static Fallback
   -------------------------------------------- */
.static-fallback {
  position: fixed;
  inset: 0;
  z-index: var(--z-behind);
  display: none;
  background: linear-gradient(
    145deg,
    var(--bg-void) 0%,
    var(--bg-surface) 30%,
    #0d1a2d 50%,
    var(--bg-elevated) 70%,
    var(--bg-void) 100%
  );
  background-size: 400% 400%;
  animation: aurora-drift 20s ease infinite;
}

.static-fallback::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 40% at 20% 30%, rgba(0, 255, 135, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse 50% 50% at 80% 60%, rgba(124, 58, 237, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse 40% 60% at 50% 80%, rgba(0, 212, 255, 0.06) 0%, transparent 50%);
  opacity: 0.8;
}

@keyframes aurora-drift {
  0%, 100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

/* --------------------------------------------
   10. FPS Counter
   -------------------------------------------- */
.fps-counter {
  position: fixed;
  top: var(--space-md);
  right: var(--space-md);
  z-index: var(--z-elevated);

  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;

  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-overlay);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-sm);

  color: var(--color-accent);
  text-shadow: 0 0 6px rgba(0, 212, 255, 0.4);
}

.fps-counter::before {
  content: 'FPS: ';
  color: var(--color-text-muted);
  text-shadow: none;
}

/* --------------------------------------------
   11. Responsive Breakpoints
   -------------------------------------------- */

/* Mobile: Stack controls vertically */
@media screen and (max-width: 479px) {
  .control-panel {
    bottom: var(--space-md);
    left: var(--space-md);
    right: var(--space-md);
    transform: none;
    flex-direction: column;
    gap: var(--space-md);
    padding: var(--space-md);
  }

  .control-group {
    width: 100%;
    flex-direction: row;
    justify-content: space-between;
  }

  .slider {
    width: 100%;
    flex: 1;
    margin-left: var(--space-sm);
    margin-right: var(--space-sm);
  }

  .fps-counter {
    top: var(--space-sm);
    right: var(--space-sm);
    font-size: 0.625rem;
  }
}

/* Tablet: Compact horizontal layout */
@media screen and (min-width: 480px) and (max-width: 767px) {
  .control-panel {
    padding: var(--space-sm) var(--space-lg);
    gap: var(--space-md);
  }

  .control-group {
    gap: 2px;
  }

  .control-label {
    font-size: 0.625rem;
  }

  .slider {
    width: 80px;
  }

  .value-display {
    font-size: 0.75rem;
  }
}

/* Desktop: Full layout (default styles apply) */
@media screen and (min-width: 768px) {
  .control-panel {
    max-width: 90vw;
  }

  .slider {
    width: 140px;
  }
}

/* Large screens */
@media screen and (min-width: 1200px) {
  .control-panel {
    gap: var(--space-xl);
    padding: var(--space-lg) var(--space-2xl);
  }

  .slider {
    width: 160px;
  }
}

/* --------------------------------------------
   12. Accessibility
   -------------------------------------------- */

/* Focus visible outlines */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.slider:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
}

/* Visually hidden utility */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Skip link for keyboard navigation */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  z-index: calc(var(--z-modal) + 1);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-primary);
  color: var(--bg-void);
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-md);
}

/* High contrast mode support */
@media (forced-colors: active) {
  .slider,
  .toggle-track {
    border: 2px solid currentColor;
  }

  .toggle-thumb,
  .slider::-webkit-slider-thumb,
  .slider::-moz-range-thumb {
    background: currentColor;
  }
}

/* --------------------------------------------
   13. Reduced Motion
   -------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  #fluid-canvas {
    display: none;
  }

  .static-fallback {
    display: block;
    animation: none;
    background-size: 100% 100%;
  }

  .loading-spinner {
    animation: none;
    border-color: var(--color-primary);
  }
}

/* --------------------------------------------
   Utility Classes
   -------------------------------------------- */
.text-primary {
  color: var(--color-primary);
}

.text-secondary {
  color: var(--color-secondary);
}

.text-accent {
  color: var(--color-accent);
}

.text-muted {
  color: var(--color-text-muted);
}

.glow-primary {
  text-shadow: 0 0 8px rgba(0, 255, 135, 0.6);
}

.glow-accent {
  text-shadow: 0 0 8px rgba(0, 212, 255, 0.6);
}

.no-select {
  user-select: none;
  -webkit-user-select: none;
}

.gpu-accelerated {
  transform: translateZ(0);
  will-change: transform;
}

/* --------------------------------------------
   14. Floating Navier-Stokes Equation
   -------------------------------------------- */
.floating-equation {
  position: fixed;
  z-index: var(--z-base);
  pointer-events: none;
  user-select: none;

  font-family: 'Times New Roman', 'Georgia', serif;
  font-size: clamp(1.2rem, 3vw, 2rem);
  font-style: italic;
  letter-spacing: 0.05em;
  white-space: nowrap;

  color: rgba(255, 255, 255, 0.25);
  text-shadow: 0 0 30px rgba(124, 58, 237, 0.4);

  animation: float-drift 60s ease-in-out infinite;
}

.floating-equation .eq-var {
  font-weight: bold;
  color: rgba(0, 212, 255, 0.35);
}

.floating-equation .eq-op {
  margin: 0 0.3em;
  color: rgba(255, 255, 255, 0.2);
}

.floating-equation .eq-part {
  display: inline-block;
}

@keyframes float-drift {
  0% {
    top: 70%;
    left: -10%;
    transform: rotate(-2deg) scale(1);
    opacity: 0;
  }
  5% {
    opacity: 1;
  }
  25% {
    top: 20%;
    left: 30%;
    transform: rotate(1deg) scale(1.05);
  }
  50% {
    top: 60%;
    left: 70%;
    transform: rotate(-1deg) scale(0.95);
  }
  75% {
    top: 30%;
    left: 40%;
    transform: rotate(2deg) scale(1.02);
  }
  95% {
    opacity: 1;
  }
  100% {
    top: 80%;
    left: 110%;
    transform: rotate(-2deg) scale(1);
    opacity: 0;
  }
}

/* Reduced motion: hide floating equation */
@media (prefers-reduced-motion: reduce) {
  .floating-equation {
    display: none;
  }
}

/* --------------------------------------------
   15. Advanced Control Panel
   -------------------------------------------- */
.advanced-panel {
  position: fixed;
  top: var(--space-md);
  right: var(--space-md);
  z-index: var(--z-overlay);
  font-family: var(--font-sans);
}

.panel-toggle {
  width: 44px;
  height: 44px;
  border: none;
  border-radius: var(--radius-lg);
  background: var(--bg-overlay);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--color-text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.panel-toggle:hover {
  color: var(--color-text);
  border-color: rgba(255, 255, 255, 0.15);
  transform: scale(1.05);
}

.panel-toggle.active {
  color: var(--color-primary);
  border-color: rgba(0, 255, 135, 0.3);
}

.panel-content {
  position: absolute;
  top: 52px;
  right: 0;
  width: 280px;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
  background: var(--bg-overlay);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  padding: var(--space-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-base);
}

.panel-content.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.panel-header span {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.reset-btn {
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.reset-btn:hover {
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

.param-section {
  margin-bottom: var(--space-md);
}

.param-section:last-child {
  margin-bottom: 0;
}

.section-title {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-sm);
}

.param-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-xs);
  align-items: center;
  margin-bottom: var(--space-sm);
}

.param-row label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  grid-column: 1 / -1;
}

.param-row input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  outline: none;
  cursor: pointer;
}

.param-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  cursor: grab;
  transition: transform var(--transition-fast);
}

.param-row input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.param-row input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-full);
  cursor: grab;
}

.param-value {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-primary);
  min-width: 40px;
  text-align: right;
}

/* Pavel-style param row with slider */
.param-row {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.param-row label {
  flex: 0 0 auto;
  min-width: 110px;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.param-row input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: rgba(0, 150, 200, 0.6);
  border-radius: var(--radius-full);
  outline: none;
  cursor: pointer;
}

.param-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 12px;
  height: 12px;
  background: var(--color-accent);
  border-radius: var(--radius-full);
  cursor: grab;
  transition: transform var(--transition-fast);
}

.param-row input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.3);
}

.param-row input[type="range"]::-moz-range-thumb {
  width: 12px;
  height: 12px;
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius-full);
  cursor: grab;
}

.param-value {
  flex: 0 0 auto;
  min-width: 35px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text);
  text-align: right;
}

/* Select dropdown */
.param-row select {
  flex: 0 0 auto;
  padding: 4px 8px;
  font-size: 0.75rem;
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-sm);
  cursor: pointer;
  outline: none;
}

.param-row select:hover {
  border-color: rgba(255, 255, 255, 0.3);
}

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

/* Toggle row with checkbox */
.toggle-row {
  justify-content: space-between;
}

.toggle-row input[type="checkbox"] {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-sm);
  cursor: pointer;
  position: relative;
  transition: all var(--transition-fast);
}

.toggle-row input[type="checkbox"]:checked {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.toggle-row input[type="checkbox"]:checked::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 12px;
  color: var(--bg-void);
  font-weight: bold;
}

.toggle-row input[type="checkbox"]:hover {
  border-color: var(--color-accent);
}

/* Action buttons */
.action-btn {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.action-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.25);
}

.action-btn.close-btn {
  background: rgba(100, 100, 120, 0.2);
  border-color: rgba(100, 100, 120, 0.3);
}

.action-btn.close-btn:hover {
  background: rgba(100, 100, 120, 0.3);
}

/* Collapsible sections */
.collapsible .section-title.clickable {
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: var(--space-sm);
}

.collapsible .section-title.clickable:hover {
  color: var(--color-primary);
}

.collapse-arrow {
  font-size: 0.6rem;
  transition: transform var(--transition-fast);
}

.section-content {
  overflow: hidden;
  max-height: 500px;
  transition: max-height var(--transition-base), opacity var(--transition-base);
}

.section-content.collapsed {
  max-height: 0;
  opacity: 0;
}

/* Scrollbar styling for panel */
.panel-content::-webkit-scrollbar {
  width: 4px;
}

.panel-content::-webkit-scrollbar-track {
  background: transparent;
}

.panel-content::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
}

.panel-content::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.3);
}

/* ============================================
   16. Glassmorphism Control Panel
   ============================================ */

/* FAB Button */
.glass-fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: var(--z-overlay);
  width: 56px;
  height: 56px;
  border: none;
  border-radius: 50%;
  background: rgba(15, 15, 35, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(0, 255, 135, 0.3);
  color: var(--color-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow:
    0 4px 24px rgba(0, 0, 0, 0.4),
    0 0 20px rgba(0, 255, 135, 0.15);
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.glass-fab:hover {
  transform: scale(1.1);
  border-color: rgba(0, 255, 135, 0.5);
  box-shadow:
    0 6px 32px rgba(0, 0, 0, 0.5),
    0 0 30px rgba(0, 255, 135, 0.25);
}

.glass-fab.active {
  transform: rotate(45deg);
  background: rgba(0, 255, 135, 0.15);
}

.glass-fab svg {
  transition: transform 0.3s ease;
}

/* Glass Panel */
.glass-panel {
  position: fixed;
  bottom: 96px;
  right: 24px;
  z-index: var(--z-overlay);
  width: 320px;
  max-height: calc(100vh - 140px);
  overflow-y: auto;
  background: rgba(10, 10, 30, 0.75);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  padding: 20px;
  box-shadow:
    0 8px 40px rgba(0, 0, 0, 0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.1),
    0 0 0 1px rgba(0, 0, 0, 0.1);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px) scale(0.95);
  transition: all 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.glass-panel.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

/* Panel Header */
.glass-panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.glass-panel-header h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 0.05em;
  margin: 0;
}

.glass-btn-icon {
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--color-text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.glass-btn-icon:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-text);
}

/* Section */
.glass-section {
  margin-bottom: 20px;
}

.glass-section:last-of-type {
  margin-bottom: 16px;
}

.glass-section-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.glass-section-title svg {
  opacity: 0.8;
}

/* Control Row */
.glass-control {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}

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

.glass-control label {
  flex: 0 0 100px;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.glass-control.toggle {
  justify-content: space-between;
}

.glass-control.toggle label:first-child {
  flex: 1;
}

/* Glass Select */
.glass-select {
  flex: 1;
  padding: 8px 12px;
  font-size: 0.8rem;
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  cursor: pointer;
  outline: none;
  transition: all 0.2s ease;
}

.glass-select:hover {
  border-color: rgba(255, 255, 255, 0.2);
}

.glass-select:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px rgba(0, 212, 255, 0.2);
}

.glass-select option {
  background: var(--bg-surface);
  color: var(--color-text);
}

/* Glass Slider */
.glass-slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  background: linear-gradient(90deg,
    var(--color-primary) 0%,
    var(--color-accent) 50%,
    var(--color-secondary) 100%
  );
  border-radius: 3px;
  outline: none;
  cursor: pointer;
  transition: transform 0.2s ease;
}

.glass-slider:hover {
  transform: scaleY(1.3);
}

.glass-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  background: var(--color-text);
  border: 2px solid var(--bg-void);
  border-radius: 50%;
  cursor: grab;
  box-shadow:
    0 2px 8px rgba(0, 0, 0, 0.3),
    0 0 12px rgba(0, 255, 135, 0.3);
  transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.glass-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow:
    0 2px 12px rgba(0, 0, 0, 0.4),
    0 0 20px rgba(0, 255, 135, 0.5);
}

.glass-slider::-webkit-slider-thumb:active {
  cursor: grabbing;
  transform: scale(1.3);
}

.glass-slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  background: var(--color-text);
  border: 2px solid var(--bg-void);
  border-radius: 50%;
  cursor: grab;
  box-shadow:
    0 2px 8px rgba(0, 0, 0, 0.3),
    0 0 12px rgba(0, 255, 135, 0.3);
}

.glass-slider::-moz-range-track {
  height: 6px;
  background: linear-gradient(90deg,
    var(--color-primary) 0%,
    var(--color-accent) 50%,
    var(--color-secondary) 100%
  );
  border-radius: 3px;
}

/* Glass Value Display */
.glass-value {
  flex: 0 0 36px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
  color: var(--color-primary);
  text-align: right;
  text-shadow: 0 0 8px rgba(0, 255, 135, 0.4);
}

/* Glass Toggle Switch */
.glass-toggle {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
  cursor: pointer;
}

.glass-toggle input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.glass-toggle-track {
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 12px;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.glass-toggle-track::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  background: var(--color-text-muted);
  border-radius: 50%;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.glass-toggle input:checked + .glass-toggle-track {
  background: linear-gradient(135deg,
    var(--color-primary) 0%,
    var(--color-accent) 100%
  );
  border-color: transparent;
  box-shadow: 0 0 16px rgba(0, 255, 135, 0.3);
}

.glass-toggle input:checked + .glass-toggle-track::after {
  transform: translateX(20px);
  background: white;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.glass-toggle:hover .glass-toggle-track {
  border-color: rgba(255, 255, 255, 0.25);
}

.glass-toggle:hover .glass-toggle-track::after {
  background: var(--color-text);
}

/* Glass Presets */
.glass-presets {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.glass-presets .glass-btn.preset {
  flex: 1;
  min-width: 80px;
  font-size: 12px;
  padding: 8px 12px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  color: rgba(255, 255, 255, 0.8);
  cursor: pointer;
  transition: all 0.2s ease;
}

.glass-presets .glass-btn.preset:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-1px);
}

.glass-presets .glass-btn.preset:active {
  transform: translateY(0);
}

/* Glass Buttons */
.glass-actions {
  display: flex;
  gap: 10px;
  margin-top: 8px;
}

.glass-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.glass-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-1px);
}

.glass-btn.primary {
  background: linear-gradient(135deg,
    rgba(0, 255, 135, 0.2) 0%,
    rgba(0, 212, 255, 0.2) 100%
  );
  border-color: rgba(0, 255, 135, 0.3);
  color: var(--color-primary);
}

.glass-btn.primary:hover {
  background: linear-gradient(135deg,
    rgba(0, 255, 135, 0.3) 0%,
    rgba(0, 212, 255, 0.3) 100%
  );
  border-color: rgba(0, 255, 135, 0.5);
  box-shadow: 0 0 20px rgba(0, 255, 135, 0.2);
}

/* Scrollbar for Glass Panel */
.glass-panel::-webkit-scrollbar {
  width: 6px;
}

.glass-panel::-webkit-scrollbar-track {
  background: transparent;
}

.glass-panel::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 3px;
}

.glass-panel::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.25);
}

/* Responsive - Mobile */
@media screen and (max-width: 600px) {
  .glass-fab {
    bottom: 16px;
    right: 16px;
    width: 48px;
    height: 48px;
  }

  .glass-panel {
    bottom: 80px;
    right: 16px;
    left: 16px;
    width: auto;
    max-height: calc(100vh - 120px);
    padding: 16px;
  }

  .glass-control label {
    flex: 0 0 80px;
    font-size: 0.7rem;
  }

  .glass-section-title {
    font-size: 0.65rem;
  }

  .glass-value {
    flex: 0 0 30px;
    font-size: 0.7rem;
  }
}