:root {
  --bg: #050b14;
  --panel: rgba(255, 255, 255, 0.055);
  --panel-strong: rgba(255, 255, 255, 0.09);
  --border: rgba(255, 255, 255, 0.11);
  --text: #f4fbff;
  --muted: #8ea5bb;
  --primary: #5ce1ff;
  --primary-rgb: 92, 225, 255;
  --lamp-color: #ffd8a3;
  --lamp-rgb: 255, 216, 163;
  --stage: #07111f;
  --brightness: 0.78;
}

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

body {
  min-height: 100vh;
  background:
    radial-gradient(circle at 20% 10%, rgba(var(--primary-rgb), 0.18), transparent 34rem),
    radial-gradient(circle at 50% 18%, rgba(var(--lamp-rgb), calc(var(--brightness) * 0.12)), transparent 24rem),
    linear-gradient(135deg, var(--bg), var(--stage));
  color: var(--text);
  font-family: Arial, sans-serif;
  overflow-x: hidden;
  transition: background 0.4s ease;
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.demo-shell {
  width: min(1440px, 100%);
  margin: 0 auto;
  padding: 24px;
}

.demo-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 26px;
}

.demo-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.language-switch {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.045);
}

.language-switch a {
  min-height: 34px;
  padding: 0 12px;
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 800;
  text-decoration: none;
}

.language-switch a.active {
  background: rgba(var(--primary-rgb), 0.14);
  color: var(--primary);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  color: var(--text);
  text-decoration: none;
}

.brand-mark {
  width: 46px;
  height: 46px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--primary), #0077ff);
  box-shadow: 0 0 28px rgba(var(--primary-rgb), 0.45);
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  letter-spacing: 2px;
}

.brand small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 0.74rem;
  letter-spacing: 2px;
}

.system-status {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid rgba(var(--primary-rgb), 0.26);
  border-radius: 999px;
  background: rgba(var(--primary-rgb), 0.09);
  color: var(--primary);
  font-weight: 700;
}

.pulse {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 18px var(--primary);
  animation: pulse 1.8s infinite;
}

.experience {
  display: grid;
  grid-template-columns: minmax(320px, 0.95fr) minmax(420px, 1.35fr);
  gap: 22px;
  align-items: stretch;
}

.room-stage {
  position: sticky;
  top: 24px;
  min-height: calc(100vh - 120px);
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.05), transparent 42%),
    radial-gradient(circle at 50% 20%, rgba(var(--lamp-rgb), calc(var(--brightness) * 0.5)), transparent 18rem),
    radial-gradient(circle at 50% 34%, rgba(var(--primary-rgb), calc(var(--brightness) * 0.16)), transparent 22rem),
    linear-gradient(145deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.015));
  box-shadow: inset 0 0 80px rgba(var(--lamp-rgb), 0.12);
  transition: background 0.35s ease, box-shadow 0.35s ease;
}

.ambient-glow {
  position: absolute;
  inset: 12%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(var(--lamp-rgb), calc(var(--brightness) * 0.48)), transparent 62%);
  filter: blur(28px);
  animation: breathe 4s ease-in-out infinite;
  transition: background 0.35s ease;
}

.light-orb {
  position: absolute;
  top: 21%;
  left: 50%;
  width: 132px;
  height: 132px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 32%, #ffffff, rgba(255, 255, 255, 0.72) 18%, transparent 31%),
    var(--lamp-color);
  box-shadow:
    0 0 calc(45px * var(--brightness)) rgba(var(--lamp-rgb), 0.95),
    0 0 calc(170px * var(--brightness)) rgba(var(--lamp-rgb), 0.42),
    0 0 calc(260px * var(--brightness)) rgba(var(--primary-rgb), 0.18);
  opacity: var(--brightness);
  transform: translateX(-50%);
  transition: background 0.35s ease, box-shadow 0.35s ease, opacity 0.28s ease;
}

.room-lines {
  position: absolute;
  inset: auto 28px 100px;
  display: grid;
  gap: 16px;
}

.room-lines span {
  display: block;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(var(--primary-rgb), 0.58), transparent);
  box-shadow: 0 0 18px rgba(var(--primary-rgb), 0.4);
}

.room-info {
  position: absolute;
  left: 28px;
  right: 28px;
  bottom: 28px;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
}

.room-info span {
  color: var(--muted);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 1.8px;
}

.room-info strong {
  color: var(--primary);
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: 0.9;
}

.control-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.panel {
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 22px;
  background: var(--panel);
  backdrop-filter: blur(18px);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.18);
}

.light-panel,
.console-panel {
  grid-column: span 2;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 22px;
}

.panel-head span {
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 1.6px;
  text-transform: uppercase;
}

.panel h1,
.panel h2 {
  margin-top: 4px;
  font-size: clamp(1.35rem, 3vw, 2rem);
  letter-spacing: 0;
}

.power {
  width: 62px;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--muted);
  font-weight: 800;
}

.power.active {
  border-color: rgba(var(--primary-rgb), 0.5);
  background: var(--primary);
  color: #001018;
  box-shadow: 0 0 28px rgba(var(--primary-rgb), 0.36);
}

.range-control {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  color: var(--muted);
}

.range-control strong {
  color: var(--text);
}

input[type="range"] {
  width: 100%;
  margin: 14px 0 22px;
  accent-color: var(--primary);
}

.temperature {
  display: grid;
  gap: 12px;
  margin-bottom: 22px;
  color: var(--muted);
}

.segmented,
.scene-list,
.quick-music {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.segmented button,
.scene-button,
.quick-music button,
.command-row button {
  min-height: 42px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0 16px;
  background: rgba(255, 255, 255, 0.055);
  color: var(--text);
  transition: 0.22s ease;
}

.segmented button.active,
.scene-button.active,
.quick-music button.active,
.segmented button:hover,
.scene-button:hover,
.quick-music button:hover,
.command-row button:hover {
  border-color: rgba(var(--primary-rgb), 0.48);
  background: rgba(var(--primary-rgb), 0.16);
  color: var(--primary);
}

.swatches {
  display: flex;
  gap: 12px;
}

.swatch {
  width: 44px;
  height: 44px;
  border: 2px solid transparent;
  border-radius: 50%;
  background: var(--swatch);
  box-shadow: 0 0 18px color-mix(in srgb, var(--swatch), transparent 45%);
}

.swatch.active {
  border-color: #ffffff;
  transform: scale(1.08);
}

.music-search,
.command-row input {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0 14px;
  outline: none;
  background: rgba(0, 0, 0, 0.22);
  color: var(--text);
}

.music-search:focus,
.command-row input:focus {
  border-color: rgba(var(--primary-rgb), 0.48);
  box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.12);
}

.track-state {
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(var(--primary-rgb), 0.1);
}

.quick-music {
  margin: 14px 0 22px;
}

.equalizer {
  display: flex;
  align-items: end;
  gap: 8px;
  height: 70px;
}

.equalizer span {
  width: 16px;
  height: 22px;
  border-radius: 999px;
  background: var(--primary);
  opacity: 0.45;
  animation: equalize 1.1s ease-in-out infinite;
}

.equalizer span:nth-child(2) {
  animation-delay: 0.12s;
}

.equalizer span:nth-child(3) {
  animation-delay: 0.24s;
}

.equalizer span:nth-child(4) {
  animation-delay: 0.36s;
}

.equalizer span:nth-child(5) {
  animation-delay: 0.48s;
}

.terminal {
  height: 240px;
  overflow-y: auto;
  border: 1px solid rgba(var(--primary-rgb), 0.18);
  border-radius: 8px;
  padding: 16px;
  background: rgba(0, 0, 0, 0.38);
  color: #d8f7ff;
  font-family: "Courier New", monospace;
  line-height: 1.55;
}

.terminal p {
  margin-bottom: 8px;
}

.terminal span,
.terminal .ok {
  color: var(--primary);
}

.command-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  margin-top: 12px;
}

body.light-off {
  --brightness: 0.08;
}

body.light-off .light-orb,
body.light-off .ambient-glow {
  opacity: 0.12;
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.8);
    opacity: 0.45;
  }
}

@keyframes breathe {
  0%,
  100% {
    transform: scale(0.96);
  }
  50% {
    transform: scale(1.08);
  }
}

@keyframes equalize {
  0%,
  100% {
    height: 18px;
  }
  50% {
    height: 64px;
  }
}

@media (max-width: 980px) {
  .experience {
    grid-template-columns: 1fr;
  }

  .room-stage {
    position: relative;
    top: auto;
    min-height: 440px;
  }
}

@media (max-width: 680px) {
  .demo-shell {
    padding: 16px;
  }

  .demo-header,
  .demo-actions,
  .panel-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .control-grid,
  .light-panel,
  .console-panel {
    grid-template-columns: 1fr;
    grid-column: span 1;
  }

  .command-row {
    grid-template-columns: 1fr;
  }
}