:root {
  /* Color Token Architecture (Keus visual identity) */
  --color-bg-primary:        #FFFFFF;
  --color-bg-warm:           #F5F4F0; /* Soft warm luxury backdrop */
  --color-bg-dark:           #111111; /* Near-black midnight panel */
  --color-bg-dark-card:      #1C1C1C;
  --color-text-primary:      #1A1A1A;
  --color-text-secondary:    #6B6B6B;
  --color-text-muted:        #9E9E9E;
  --color-accent-gold:       #C4A882; /* Warm champagne luxury hint */
  --color-border-muted:      #E0DFDB;
  
  /* Typography Scale */
  --font-serif: "Expose", "Inter", system-ui, sans-serif;
  --font-sans:  "Inter", system-ui, sans-serif;
  
  /* Layout Constants */
  --transition-smooth: all 0.5s cubic-bezier(0.25, 1, 0.5, 1);
  --transition-fast: all 0.25s ease;
}

/* =========================================================================
   GLOBAL IMAGE RENDERING — Maximum Sharpness & GPU Compositing
   Prevents pixelation, blur, and sub-pixel artifacts during ALL animations,
   scroll events, transforms, and GPU layer promotions.
   ========================================================================= */

/* 1. GPU layer promotion for all media (prevents re-rasterization on scroll) */
img, video, picture {
  backface-visibility: hidden;         /* Prevent layer flip artifacts */
  -webkit-backface-visibility: hidden;
  transform: translateZ(0);            /* Promote to compositor layer */
  -webkit-transform: translateZ(0);
}

/* Canvas gets its own rule — no crisp-edges/pixelated which destroy photo quality */
canvas {
  image-rendering: auto;               /* Browser uses best algorithm for element scaling */
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  transform: translateZ(0);
  -webkit-transform: translateZ(0);
}

/* 2. Background-image elements: GPU acceleration */
[style*="background-image"],
.story-bg,
.keus-room-frame,
.keus-kitchen-scene {
  transform: translateZ(0);
  -webkit-transform: translateZ(0);
  will-change: transform, opacity;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  image-rendering: high-quality;
}

/* 3. All animated / transitioning elements: static GPU layer */
.story-slide,
.keus-features-bottom-overlay,
.keus-feature-col,
.keus-climate-widget,
.keus-command-text-floating,
.keus-subnav-wrapper,
.keus-section,
.keus-voice-layout,
.keus-sim-phone-shell,
.keus-sensor-card {
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  transform: translateZ(0);
  -webkit-transform: translateZ(0);
}

/* 4. Prevent filter / opacity changes from causing re-rasterization */
.story-slide {
  will-change: opacity, transform;
}


/* 5. Canvas element scaling: auto = browser uses high-quality bicubic algorithm */
/* DO NOT use crisp-edges or pixelated — those destroy photographic image quality */
#zoomTransitionCanvas,
.story-bg-canvas {
  image-rendering: auto;              /* Bilinear/bicubic for photo content */
  will-change: contents;              /* Compositor hint: content changes frequently */
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  transform: translateZ(0);
  -webkit-transform: translateZ(0);
}

/* =========================================================================
   Reset & Baseline Enhancements
   ========================================================================= */
.keus-ecosystem {
  font-family: var(--font-sans);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  overflow-x: clip;
  position: relative;
}

.keus-ecosystem::before {
  content: '';
  position: absolute;
  top: 15%;
  left: 5%;
  width: 400px;
  height: 400px;
  border-radius: 50% !important;
  background: radial-gradient(circle, rgba(196, 168, 130, 0.08) 0%, transparent 70%);
  filter: blur(80px);
  z-index: 0;
  pointer-events: none;
}

.keus-ecosystem::after {
  content: '';
  position: absolute;
  top: 60%;
  right: 5%;
  width: 500px;
  height: 500px;
  border-radius: 50% !important;
  background: radial-gradient(circle, rgba(80, 128, 224, 0.04) 0%, transparent 70%);
  filter: blur(90px);
  z-index: 0;
  pointer-events: none;
}

.keus-ecosystem * {
  border-radius: 0px; /* Sharp premium geometric layout by default */
  box-sizing: border-box;
}

/* Serif displays */
.keus-serif {
  font-family: var(--font-serif);
  font-weight: 800;
}

/* Section Title formatting */
.keus-display-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.5px;
  color: var(--color-text-primary);
  text-transform: uppercase;
}

.keus-eyebrow {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--color-accent-gold);
  display: block;
  margin-bottom: 1.5rem;
}

/* =========================================================================
   Secondary Sticky Sub-Nav
   ========================================================================= */
.keus-subnav-wrapper {
  position: sticky;
  top: 95px; /* Floats slightly lower under standard global header */
  margin: 1.5rem auto;
  max-width: 800px;
  width: calc(100% - 3rem);
  background-color: var(--color-subnav-bg, rgba(255, 255, 255, 0.65));
  border: 1px solid var(--color-border-muted) !important;
  border-radius: 50px !important; /* Beautiful rounded floating capsule! */
  z-index: 99;
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  box-shadow: 0 12px 32px 0 rgba(0, 0, 0, 0.06);
  transition: var(--transition-smooth);
}

.keus-subnav {
  display: flex;
  justify-content: center;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.keus-subnav-link {
  display: block;
  padding: 1.25rem 2rem;
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--color-text-secondary);
  text-decoration: none !important;
  position: relative;
  transition: var(--transition-fast);
}

.keus-subnav-link:hover {
  color: var(--color-text-primary);
}

.keus-subnav-link::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 50%;
  width: 0;
  height: 2px;
  background-color: var(--color-text-primary);
  transition: var(--transition-fast);
  transform: translateX(-50%);
}

.keus-subnav-link.active {
  color: var(--color-text-primary);
}

.keus-subnav-link.active::after {
  width: 100%;
}

/* =========================================================================
   Structural Padding & Geometric Blocks
   ========================================================================= */
.keus-section {
  padding: 120px 0;
  position: relative;
  background-color: var(--color-bg-primary);
}

.keus-section--warm {
  background-color: var(--color-bg-warm);
}

.keus-section--dark {
  background-color: var(--color-bg-dark);
  color: var(--color-bg-primary);
}

.keus-section--dark .keus-display-title {
  color: #FFFFFF !important;
}

.keus-section--dark .keus-subnav-link {
  color: var(--color-border-muted);
}

.keus-grid-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* =========================================================================
   Section A: Voice Assistant (Interactive Wake Word)
   ========================================================================= */
.keus-voice-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4.5rem;
  align-items: center;
}

.keus-voice-left {
  display: flex;
  flex-direction: column;
}

/* Wake Word Tab selector */
.keus-wakeword-panel {
  margin-top: 2.5rem;
  background: rgba(255, 255, 255, 0.45) !important;
  border: 1px solid rgba(255, 255, 255, 0.25) !important;
  backdrop-filter: blur(12px) saturate(140%);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  padding: 2rem;
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.03);
}

.keus-wakeword-tabs {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.keus-wakeword-tab {
  background: none;
  border: 1px solid var(--color-border-muted);
  padding: 0.6rem 1.25rem;
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: var(--transition-fast);
}

.keus-wakeword-tab:hover {
  border-color: var(--color-text-primary);
  color: var(--color-text-primary);
}

.keus-wakeword-tab.active {
  background: var(--color-text-primary);
  border-color: var(--color-text-primary);
  color: var(--color-bg-primary);
}

.keus-wakeword-custom-input {
  width: 100%;
  border: 1px solid var(--color-border-muted);
  padding: 0.75rem 1rem;
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--color-text-primary);
  background: var(--color-bg-warm);
  outline: none;
  transition: var(--transition-fast);
}

.keus-wakeword-custom-input:focus {
  border-color: var(--color-text-primary);
  background: var(--color-bg-primary);
}

/* Actionable trigger cards */
.keus-command-canvas {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.keus-command-card {
  border: 1px solid rgba(255, 255, 255, 0.3) !important;
  padding: 1.25rem 1.5rem;
  background: rgba(255, 255, 255, 0.55) !important;
  backdrop-filter: blur(8px) saturate(130%);
  -webkit-backdrop-filter: blur(8px) saturate(130%);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  transition: var(--transition-fast);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.02);
}

.keus-command-card:hover {
  border-color: var(--color-text-primary);
  background: var(--color-bg-warm);
  transform: translateX(5px);
}

.keus-command-card.active {
  border-color: var(--color-accent-gold);
  background: var(--color-bg-warm);
}

.keus-command-text {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.25rem;
  color: var(--color-text-primary);
}

.keus-command-play {
  font-size: 11px;
  color: var(--color-accent-gold);
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 0.1em;
  opacity: 0;
  transition: var(--transition-fast);
}

.keus-command-card:hover .keus-command-play,
.keus-command-card.active .keus-command-play {
  opacity: 1;
}

/* Voice Right Column: Dynamic Room Preview */
.keus-voice-right {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}

.keus-room-frame {
  width: 100%;
  height: 480px;
  background: #080808;
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Room Overlay Graphics simulating actual premium environments */
.keus-room-ambient {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  transition: var(--transition-smooth);
  opacity: 0.4;
}

/* Ambient dynamic overlay layers */
.keus-room-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  mix-blend-mode: screen;
  transition: var(--transition-smooth);
  opacity: 0;
}

/* SVG Interior elements for pure CSS/JS responsiveness */
.keus-room-svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 2;
}

.keus-curtain {
  fill: #1C1C1D;
  transition: var(--transition-smooth);
}

.keus-screen-glow {
  fill: var(--color-accent-gold);
  opacity: 0;
  transition: var(--transition-smooth);
  filter: blur(10px);
}

.keus-lamp-glow {
  fill: #FFE5B4;
  opacity: 0.15;
  transition: var(--transition-smooth);
  filter: blur(15px);
}

/* Interactive Room States */
.state-default .keus-room-ambient { opacity: 0.45; }

.state-curtains .keus-curtain-left { transform: scaleX(0.2); transform-origin: left; }
.state-curtains .keus-curtain-right { transform: scaleX(0.2); transform-origin: right; }
.state-curtains .keus-room-ambient { opacity: 0.75; } /* Let ambient light in */

.state-dim .keus-room-ambient { opacity: 0.18; }
.state-dim .keus-lamp-glow { opacity: 0.6; fill: #FFA07A; } /* warm ambient cozy light */

.state-cinema .keus-room-ambient { opacity: 0.08; }
.state-cinema .keus-screen-glow { opacity: 0.85; }
.state-cinema .keus-lamp-glow { opacity: 0.05; }
.state-cinema .keus-curtain-left { transform: scaleX(1); transform-origin: left; }
.state-cinema .keus-curtain-right { transform: scaleX(1); transform-origin: right; }

/* Status Waveforms */
.keus-voice-waveform {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 4px;
  height: 30px;
  z-index: 3;
}

.keus-wave-bar {
  width: 3px;
  height: 4px;
  background: var(--color-accent-gold);
  transition: 0.15s ease-in-out;
}

.listening .keus-wave-bar {
  animation: audioPulse 1.2s ease-in-out infinite alternate;
}

.listening .keus-wave-bar:nth-child(2) { animation-delay: 0.15s; }
.listening .keus-wave-bar:nth-child(3) { animation-delay: 0.3s; }
.listening .keus-wave-bar:nth-child(4) { animation-delay: 0.45s; }
.listening .keus-wave-bar:nth-child(5) { animation-delay: 0.6s; }

@keyframes audioPulse {
  0% { height: 4px; }
  100% { height: 28px; }
}

.keus-voice-status-text {
  position: absolute;
  bottom: 4.5rem;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-sans);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: rgba(255,255,255,0.6);
  z-index: 3;
  pointer-events: none;
}

/* =========================================================================
   Section B: Touch Control (Tri-Layer interaction)
   ========================================================================= */
.keus-touch-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 2.5rem;
  margin-top: 4.5rem;
}

.keus-touch-card {
  background: rgba(20, 20, 22, 0.4) !important;
  border: 1px solid rgba(255, 255, 255, 0.08) !important;
  border-radius: 32px !important;
  backdrop-filter: blur(40px) saturate(180%);
  -webkit-backdrop-filter: blur(40px) saturate(180%);
  padding: 3.5rem 2.5rem;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.1);
  transition: all 0.6s cubic-bezier(0.25, 1, 0.5, 1);
  color: #FFFFFF !important;
}

.keus-touch-card--dark {
  background: rgba(40, 40, 44, 0.45) !important;
  border: 1px solid rgba(255, 255, 255, 0.12) !important;
  border-radius: 32px !important;
  backdrop-filter: blur(40px) saturate(180%);
  -webkit-backdrop-filter: blur(40px) saturate(180%);
  color: #FFFFFF !important;
  padding: 3.5rem 2.5rem;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.2);
  transition: all 0.6s cubic-bezier(0.25, 1, 0.5, 1);
}

.keus-touch-card--dark .keus-touch-card-title {
  color: #FFFFFF !important;
}

.keus-touch-card--dark .keus-touch-card-desc {
  color: rgba(255, 255, 255, 0.7) !important;
}

.keus-touch-card--dark .keus-touch-bullet {
  color: #FFFFFF !important;
}

.keus-touch-card:hover, .keus-touch-card--dark:hover {
  transform: translateY(-12px) scale(1.02);
  background: rgba(30, 30, 35, 0.6) !important;
  border-color: rgba(255, 255, 255, 0.2) !important;
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4), 0 0 40px rgba(196, 168, 130, 0.15), inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.keus-touch-card-num {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  color: var(--color-accent-gold);
  margin-bottom: 2rem;
  opacity: 0.9;
}

.keus-touch-card-title {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 1rem;
  text-transform: uppercase;
  color: #FFFFFF;
}

.keus-touch-card-desc {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 2rem;
}

.keus-touch-card--dark .keus-touch-card-desc {
  color: rgba(255, 255, 255, 0.7);
}

.keus-touch-bullet-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: auto;
}

.keus-touch-bullet {
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: rgba(255, 255, 255, 0.75);
}

.keus-touch-card--dark .keus-touch-bullet {
  color: rgba(255, 255, 255, 0.9);
}

.keus-touch-bullet i {
  color: var(--color-accent-gold);
  font-size: 10px;
}

/* Touch remote details */
.keus-touch-remote-mockup {
  height: 100px;
  border-top: 1px solid var(--color-border-muted);
  margin-top: 2rem;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
}

.keus-remote-button {
  width: 32px;
  height: 32px;
  border-radius: 50% !important; /* Circular physical remote keys */
  border: 1px solid var(--color-border-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  color: var(--color-text-secondary);
}

/* =========================================================================
   Interactive Mobile App Simulator (Phone Frame Mockup)
   ========================================================================= */
.keus-mobile-simulator {
  max-width: 900px;
  margin: 60px auto 0 auto;
  background: rgba(20, 20, 22, 0.45) !important;
  border: 1px solid rgba(255, 255, 255, 0.15) !important;
  border-radius: 40px !important;
  backdrop-filter: blur(40px) saturate(180%);
  -webkit-backdrop-filter: blur(40px) saturate(180%);
  padding: 4rem;
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 4rem;
  align-items: center;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

/* Left Smartphone mockup (Spatial Chassis) */
.keus-sim-phone {
  width: 320px;
  height: 600px;
  background: #000000;
  border: 12px solid transparent;
  background-image: linear-gradient(#050505, #050505), linear-gradient(135deg, rgba(255,255,255,0.4) 0%, rgba(255,255,255,0.05) 50%, rgba(255,255,255,0.2) 100%);
  background-origin: border-box;
  background-clip: padding-box, border-box;
  border-radius: 48px !important; /* Smartphone outline */
  box-shadow: 0 30px 60px -10px rgba(0, 0, 0, 0.6), inset 0 0 20px rgba(0,0,0,0.8);
  position: relative;
  overflow: hidden;
}

.keus-sim-notch {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 140px;
  height: 24px;
  background: #1C1C1D;
  border-bottom-left-radius: 18px !important;
  border-bottom-right-radius: 18px !important;
  z-index: 5;
}

.keus-sim-screen {
  width: 100%;
  height: 100%;
  background: #0D0D0F;
  padding: 32px 1.5rem 1.5rem 1.5rem;
  display: flex;
  flex-direction: column;
  color: #FFFFFF;
}

/* Statusbar details */
.keus-sim-statusbar {
  display: flex;
  justify-content: space-between;
  font-size: 10px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 1.5rem;
}

/* App Header & Tabs */
.keus-sim-app-header {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 300;
  margin-bottom: 1.25rem;
}

.keus-sim-app-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  margin-bottom: 1.5rem;
}

.keus-sim-app-tab {
  background: none;
  border: none;
  padding: 0.5rem 0;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.4);
  cursor: pointer;
  position: relative;
  text-align: center;
}

.keus-sim-app-tab.active {
  color: #FFFFFF;
}

.keus-sim-app-tab.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-accent-gold);
}

/* Tab Panels */
.keus-sim-panel {
  display: none;
  flex-direction: column;
  gap: 1.25rem;
  height: 100%;
  overflow-y: auto;
}

.keus-sim-panel.active {
  display: flex;
}

/* Interactive elements inside mobile screen (Pill cards) */
.keus-sim-device-row {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 20px !important;
  padding: 1.25rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: all 0.3s ease;
}

.keus-sim-device-row:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.keus-sim-device-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.keus-sim-device-title {
  font-size: 12px;
  font-weight: 500;
  color: #FFFFFF;
}

.keus-sim-device-val {
  font-size: 12px;
  color: var(--color-accent-gold);
  font-weight: 600;
}

/* Custom visual slider handles */
.keus-sim-slider-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.keus-sim-range-input {
  -webkit-appearance: none;
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.15);
  outline: none;
  border-radius: 2px !important;
}

.keus-sim-range-input::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50% !important; /* Visual handle */
  background: var(--color-accent-gold);
  cursor: pointer;
  transition: transform 0.1s ease;
}

.keus-sim-range-input::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

/* Visual Kelvin display shifting styling */
.keus-kelvin-indicator {
  height: 20px;
  width: 100%;
  background: linear-gradient(to right, #FF8B1F, #FFB46B, #FFF5EC, #E6F0FF, #A3C9FF);
  margin-top: 0.5rem;
}

/* Visual interactive curtain graphic representation */
.keus-visual-curtain-track {
  height: 35px;
  width: 100%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px dashed rgba(255, 255, 255, 0.15);
  position: relative;
  overflow: hidden;
}

.keus-visual-curtain-shade {
  position: absolute;
  top: 0;
  height: 100%;
  background: rgba(196, 168, 130, 0.3); /* gold curtains shade */
  width: 50%; /* driven dynamically from 0 to 50% */
  transition: 0.1s ease;
}

.keus-visual-curtain-shade--left { left: 0; border-right: 1px solid var(--color-accent-gold); }
.keus-visual-curtain-shade--right { right: 0; border-left: 1px solid var(--color-accent-gold); }

/* Right Column Simulator Info */
.keus-sim-info {
  display: flex;
  flex-direction: column;
}

.keus-sim-title {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 1.25rem;
  text-transform: uppercase;
  color: #FFFFFF;
}

.keus-sim-text {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 2rem;
}

.keus-sim-action-btn {
  align-self: flex-start;
  background: rgba(255, 255, 255, 0.1);
  color: #FFFFFF;
  border: 1px solid rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 1rem 2.25rem;
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  cursor: pointer;
  transition: var(--transition-fast);
  text-decoration: none !important;
  border-radius: 30px;
}

.keus-sim-action-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  color: #FFFFFF;
  border-color: var(--color-accent-gold);
  box-shadow: 0 0 15px rgba(196, 168, 130, 0.2);
}

/* =========================================================================
   Section C: Sensor / Motion (Timeline layout)
   ========================================================================= */
.keus-sensor-timeline {
  position: relative;
  max-width: 900px;
  margin: 60px auto 0 auto;
}

/* Timeline Vertical Line marker */
.keus-sensor-timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 2rem;
  width: 1px;
  height: 100%;
  background: var(--color-border-muted);
}

.keus-timeline-item {
  position: relative;
  padding-left: 5rem;
  margin-bottom: 4.5rem;
}

.keus-timeline-item:last-child {
  margin-bottom: 0;
}

/* Timeline Circle Node indicators */
.keus-timeline-dot {
  position: absolute;
  top: 0.25rem;
  left: calc(2rem - 6px);
  width: 13px;
  height: 13px;
  background: var(--color-bg-primary);
  border: 2px solid var(--color-text-primary);
  transition: var(--transition-fast);
}

.keus-timeline-item:hover .keus-timeline-dot {
  background: var(--color-accent-gold);
  border-color: var(--color-accent-gold);
  box-shadow: 0 0 0 6px rgba(196, 168, 130, 0.2);
}

.keus-timeline-time {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent-gold);
  margin-bottom: 0.5rem;
  display: block;
}

.keus-timeline-heading {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 1rem;
  color: var(--color-text-primary);
  text-transform: uppercase;
}

.keus-timeline-desc {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text-secondary);
}

/* Ambient glow cards */
.keus-ambient-cards-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 2rem;
  margin-top: 4.5rem;
}

.keus-ambient-card {
  background: rgba(255, 255, 255, 0.45) !important;
  border: 1px solid rgba(255, 255, 255, 0.3) !important;
  backdrop-filter: blur(12px) saturate(140%);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  padding: 2.25rem 2rem;
  position: relative;
  overflow: hidden;
  transition: var(--transition-fast);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.02);
}

.keus-ambient-card::before {
  content: '';
  position: absolute;
  bottom: -40px;
  right: -40px;
  width: 100px;
  height: 100px;
  border-radius: 50% !important;
  background: var(--color-accent-gold);
  opacity: 0;
  filter: blur(40px);
  transition: var(--transition-smooth);
}

.keus-ambient-card:hover {
  border-color: var(--color-text-primary);
}

.keus-ambient-card:hover::before {
  opacity: 0.45;
  width: 150px;
  height: 150px;
}

.keus-ambient-icon {
  font-size: 1.5rem;
  color: var(--color-accent-gold);
  margin-bottom: 1.5rem;
  display: block;
}

.keus-ambient-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
  color: var(--color-text-primary);
  text-transform: uppercase;
}

.keus-ambient-desc {
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-text-secondary);
}

/* =========================================================================
   Responsive Breakpoints & Adjustments
   ========================================================================= */
@media (max-width: 991px) {
  .keus-section {
    padding: 80px 0;
  }
  
  .keus-voice-layout {
    grid-template-columns: 1fr;
    gap: 3.5rem;
  }
  
  .keus-touch-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .keus-mobile-simulator {
    grid-template-columns: 1fr;
    justify-items: center;
    padding: 3rem 1.5rem;
    gap: 3rem;
  }
  
  .keus-sim-info {
    align-items: center;
    text-align: center;
  }
  
  .keus-sim-action-btn {
    align-self: center;
  }
  
  .keus-ambient-cards-row {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

@media (max-width: 767px) {
  .keus-section {
    padding: 64px 0;
  }
  
  .keus-subnav-link {
    padding: 1rem 1rem;
    font-size: 10px;
    letter-spacing: 0.1em;
  }
  
  .keus-display-title {
    font-size: 2.5rem;
  }
  
  .keus-room-frame {
    height: 320px;
  }
}

/* =========================================================================
   Dark Theme Overrides
   ========================================================================= */
.keus-ecosystem[data-theme="dark"] {
  --color-bg-primary:        #111111; /* Pitch black */
  --color-bg-warm:           rgba(28, 28, 28, 0.35); /* Dark gray glass for simulated modules */
  --color-bg-dark:           #080808; /* Deep black for dark sections */
  --color-bg-dark-card:      rgba(40, 40, 40, 0.55);
  --color-text-primary:      #FFFFFF; /* White primary text */
  --color-text-secondary:    #A0A0A0; /* Light gray description text */
  --color-text-muted:        #6B6B6B;
  --color-border-muted:      #2C2C2C; /* Dark borders */
  --color-subnav-bg:         rgba(17, 17, 17, 0.65);
}

.keus-ecosystem[data-theme="dark"] .story-bg-overlay {
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0.55), rgba(0, 0, 0, 0.85));
}

.keus-ecosystem[data-theme="dark"] .keus-subnav-wrapper {
  border-bottom-color: var(--color-border-muted);
}

/* =========================================================================
   Theme Toggle Component Styling
   ========================================================================= */
.keus-theme-toggle {
  background: none;
  border: 1px solid var(--color-text-primary);
  color: var(--color-text-primary);
  padding: 0.5rem 1rem;
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto; /* Pushes to the right side of the flex row! */
  transition: var(--transition-fast);
}

.keus-theme-toggle:hover {
  background: var(--color-text-primary);
  color: var(--color-bg-primary);
}

.keus-ecosystem[data-theme="dark"] .keus-wakeword-custom-input {
  background: #252525;
  color: #FFFFFF;
}

.keus-ecosystem[data-theme="dark"] .keus-command-card:hover,
.keus-ecosystem[data-theme="dark"] .keus-command-card.active {
  background: #252525;
}

.keus-ecosystem[data-theme="dark"] .keus-wakeword-panel {
  background: rgba(28, 28, 28, 0.45) !important;
  border-color: rgba(255, 255, 255, 0.08) !important;
}

.keus-ecosystem[data-theme="dark"] .keus-command-card {
  background: rgba(28, 28, 28, 0.55) !important;
  border-color: rgba(255, 255, 255, 0.06) !important;
}

.keus-ecosystem[data-theme="dark"] .keus-touch-card {
  background: rgba(28, 28, 28, 0.55) !important;
  border-color: rgba(255, 255, 255, 0.06) !important;
}

.keus-ecosystem[data-theme="dark"] .keus-mobile-simulator {
  background: rgba(28, 28, 28, 0.35) !important;
  border-color: rgba(255, 255, 255, 0.08) !important;
}

.keus-ecosystem[data-theme="dark"] .keus-ambient-card {
  background: rgba(28, 28, 28, 0.45) !important;
  border-color: rgba(255, 255, 255, 0.06) !important;
}

/* =========================================================================
   Scrollytelling Hero Story Layout
   ========================================================================= */
.scroll-story-section {
  position: relative;
  height: 900vh; /* 900vh for dramatically slower scroll animations */
  background: #111;
  color: #fff;
}

.scroll-story-sticky {
  position: sticky;
  top: 0;
  height: 100vh;
  width: 100%;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  /* GPU layer promotion — prevents re-rasterization on every scroll tick */
  will-change: transform;
  transform: translateZ(0);
  -webkit-transform: translateZ(0);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.story-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  opacity: 0;
  transition: opacity 1s cubic-bezier(0.25, 1, 0.5, 1);
  z-index: 1;
}

.story-bg.active {
  opacity: 1;
  z-index: 2;
}

.story-bg-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: block;
  z-index: 2;
  opacity: 1 !important;
  /* 
   * image-rendering: auto — browser uses bilinear/bicubic interpolation
   * when scaling the canvas element via CSS. This is CORRECT for photographic
   * JPEG frames. Never use crisp-edges/pixelated for photos.
   */
  image-rendering: auto;
  /* Hard GPU layer — prevents re-rasterization on every scroll frame */
  will-change: contents;
  transform: translateZ(0);
  -webkit-transform: translateZ(0);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.story-bg-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.4);
  z-index: 3;
}

.scroll-text-wrapper {
  position: relative;
  z-index: 4;
  width: 100%;
  height: 100%;
}

.scroll-text-wrapper p.lead {
  color: #ffffff !important;
}

.scroll-text-wrapper h1.keus-display-title {
  color: #ffffff !important;
}

.story-slide {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -40%) scale(0.95);
  width: 100%;
  max-width: 1200px;
  padding: 0 1.5rem;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.8s cubic-bezier(0.25, 1, 0.5, 1), transform 0.8s cubic-bezier(0.25, 1, 0.5, 1), visibility 0.8s;
  text-align: center;
  z-index: 5;
}

.story-slide.active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translate(-50%, -50%) scale(1);
}

/* Center-aligned layout adjustments */
.story-slide .keus-eyebrow,
.story-slide .keus-display-title,
.story-slide .lead {
  text-align: center;
}

.story-slide .lead {
  margin-left: auto;
  margin-right: auto;
}

/* Slide 3 Layout: Voice Assistant Centered */
.keus-voice-centered-layout {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 3.5rem;
  align-items: center;
  text-align: center;
  margin-top: 1.5rem;
}

.keus-voice-left-centered {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.keus-voice-left-centered .keus-wakeword-panel {
  width: 100%;
  max-width: 500px;
  background: rgba(255, 255, 255, 0.45) !important;
  border: 1px solid rgba(0, 0, 0, 0.08) !important;
  text-align: center;
  border-radius: 12px !important;
}

.keus-voice-left-centered .keus-wakeword-tabs {
  justify-content: center;
}

.keus-voice-left-centered .keus-command-card {
  background: rgba(255, 255, 255, 0.55) !important;
  border-color: rgba(0, 0, 0, 0.08) !important;
  text-align: left;
  border-radius: 8px !important;
}

.keus-voice-left-centered .keus-command-card:hover,
.keus-voice-left-centered .keus-command-card.active {
  background: rgba(255, 255, 255, 0.8) !important;
  border-color: var(--color-accent-gold) !important;
}

.keus-voice-left-centered .keus-command-text {
  color: var(--color-text-primary);
}

.keus-voice-right-centered {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
}

.keus-voice-right-centered .keus-room-frame {
  max-width: 440px;
  height: 380px;
  border-radius: 16px !important;
}

/* Adjustments for voice elements inside dark theme */
.keus-ecosystem[data-theme="dark"] .keus-voice-left-centered .keus-wakeword-panel {
  background: rgba(17, 17, 17, 0.7) !important;
  border-color: rgba(255, 255, 255, 0.1) !important;
}

.keus-ecosystem[data-theme="dark"] .keus-voice-left-centered .keus-command-card {
  background: rgba(255, 255, 255, 0.05) !important;
  border-color: rgba(255, 255, 255, 0.1) !important;
}

.keus-ecosystem[data-theme="dark"] .keus-voice-left-centered .keus-command-card:hover,
.keus-ecosystem[data-theme="dark"] .keus-voice-left-centered .keus-command-card.active {
  background: rgba(255, 255, 255, 0.1) !important;
}

.keus-ecosystem[data-theme="dark"] .keus-voice-left-centered .keus-command-text {
  color: #fff;
}

/* Responsive adjustments for mobile viewports */
@media (max-width: 991px) {
  .keus-voice-centered-layout {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    max-height: 52vh;
    overflow-y: auto;
  }
  .keus-voice-right-centered .keus-room-frame {
    height: 240px;
  }
}

/* Floating Voice Command for Slide 3 & 4 (Positioned at bottom-left) */
.keus-command-text-floating {
  position: absolute;
  bottom: 28vh;
  left: 5%;
  top: auto;
  transform: translateY(50px);
  opacity: 0;
  font-family: 'Cormorant Garamond', serif;
  font-style: italic;
  font-weight: 300;
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  color: #c9a84c;
  text-shadow: 0 0 40px rgba(201, 168, 76, 0.3);
  z-index: 10;
  pointer-events: none;
  text-align: left;
  white-space: nowrap;
  letter-spacing: 0.04em;
  line-height: 1.2;
  transition: transform 0.2s ease-out, opacity 0.2s ease-out;
}

/* Position Slide 3, 4 & 5 headings higher up to avoid overlap with bottom-left elements */
.story-slide.slide-3,
.story-slide.slide-4,
.story-slide.slide-5,
.story-slide.sensor-slide {
  top: 30% !important;
}

/* Bottom Features Columns Overlay */
.keus-features-bottom-overlay {
  position: absolute;
  bottom: 5vh;
  left: 5%;
  width: 90%;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  z-index: 8;
  pointer-events: none;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.keus-features-bottom-overlay.visible {
  opacity: 1;
  transform: translateY(0);
}

.keus-feature-col {
  opacity: 0.25;
  transition: opacity 0.5s ease, transform 0.5s ease, border-color 0.5s ease;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1rem;
}

.keus-feature-col.active {
  opacity: 1;
  border-top-color: var(--color-accent-gold) !important;
  transform: translateY(-5px);
}

.keus-feature-col h4 {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: #ffffff;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.keus-feature-col p {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.5;
  margin: 0;
}