:root {
  --bg: #0d0b09;
  --panel: rgba(26, 21, 16, 0.72);
  --line: rgba(255, 226, 173, 0.12);
  --ink: #f4ead8;
  --muted: #a69680;
  --amber: #ffb454;
  --amber-hot: #ffd98a;
  --green: #8fd694;
  --radius: 16px;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
}

body {
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: clamp(12px, 3vw, 32px);
  font-family: ui-sans-serif, -apple-system, "Segoe UI", Inter, Roboto, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1100px 700px at 50% -10%, rgba(255, 150, 55, 0.13), transparent 60%),
    radial-gradient(900px 600px at 100% 100%, rgba(120, 60, 20, 0.14), transparent 55%),
    radial-gradient(700px 500px at 0% 80%, rgba(80, 40, 15, 0.12), transparent 60%),
    var(--bg);
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.035;
  z-index: 2;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
}

.scene {
  /* keep the square board fully visible on laptop screens */
  width: min(100%, 860px, calc(100svh - 260px));
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(10px, 1.6vw, 18px);
}

/* ---------- top bar ---------- */

.hud {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 0 6px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  border-radius: 12px;
  color: var(--amber-hot);
  background: linear-gradient(160deg, rgba(255, 180, 84, 0.22), rgba(255, 120, 20, 0.06));
  border: 1px solid rgba(255, 180, 84, 0.28);
  box-shadow: inset 0 1px 0 rgba(255, 235, 200, 0.16), 0 8px 26px -12px rgba(255, 160, 60, 0.5);
}

.brand-text h1 {
  margin: 0;
  font-size: clamp(15px, 2.3vw, 19px);
  font-weight: 650;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.brand-text p {
  margin: 3px 0 0;
  font-size: 11.5px;
  font-weight: 500;
  color: #f0cfa2;
  letter-spacing: 0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.readout {
  display: flex;
  align-items: stretch;
  gap: 2px;
  padding: 4px;
  border-radius: 12px;
  background: var(--panel);
  border: 1px solid var(--line);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  flex: 0 0 auto;
}

.gauge {
  display: flex;
  align-items: baseline;
  gap: 4px;
  padding: 5px 11px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.02);
}

.gauge + .gauge { position: relative; }

.gauge + .gauge::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 22%;
  bottom: 22%;
  width: 1px;
  background: rgba(255, 226, 173, 0.1);
}

.gauge span {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 15px;
  font-variant-numeric: tabular-nums;
  color: var(--amber-hot);
  text-shadow: 0 0 18px rgba(255, 180, 84, 0.45);
}

.gauge small {
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- stage ---------- */

.stage {
  position: relative;
  border-radius: 26px;
  padding: clamp(6px, 1.2vw, 14px);
  background:
    radial-gradient(80% 70% at 50% 40%, rgba(255, 170, 70, 0.07), transparent 70%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.035), rgba(255, 255, 255, 0.008));
  border: 1px solid rgba(255, 226, 173, 0.08);
  box-shadow:
    0 40px 120px -50px rgba(0, 0, 0, 0.9),
    inset 0 1px 0 rgba(255, 240, 210, 0.05);
  perspective: 1400px;
}

#board {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1;
  border-radius: 18px;
  transform: rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg));
  transform-style: preserve-3d;
  transition: transform 500ms cubic-bezier(0.22, 0.8, 0.3, 1);
  will-change: transform;
  filter: drop-shadow(0 36px 60px rgba(0, 0, 0, 0.55));
}

.stage-hint {
  position: absolute;
  right: 18px;
  bottom: 12px;
  font-size: 10px;
  letter-spacing: 0.04em;
  color: rgba(244, 234, 216, 0.3);
  pointer-events: none;
  user-select: none;
}

/* ---------- console ---------- */

.console {
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.2vw, 12px);
  padding: 9px 10px;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--line);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow: 0 24px 70px -40px rgba(0, 0, 0, 0.85), inset 0 1px 0 rgba(255, 240, 210, 0.06);
  flex-wrap: wrap;
}

.power {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 7px 11px 7px 8px;
  border-radius: 11px;
  border: 1px solid rgba(255, 255, 255, 0.09);
  background: rgba(255, 255, 255, 0.03);
  color: var(--ink);
  font: inherit;
  cursor: pointer;
  transition: background 180ms ease, border-color 180ms ease;
}

.power:hover { background: rgba(255, 255, 255, 0.055); }
.power:active { transform: translateY(1px); }

.power:focus-visible,
.modes button:focus-visible,
input[type="range"]:focus-visible {
  outline: 2px solid rgba(255, 180, 84, 0.7);
  outline-offset: 2px;
}

.switch {
  position: relative;
  width: 42px;
  height: 22px;
  border-radius: 7px;
  background: linear-gradient(180deg, #241d17, #161210);
  border: 1px solid rgba(255, 226, 173, 0.16);
  box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.65);
  flex: 0 0 auto;
}

.knob {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 15px;
  height: 14px;
  border-radius: 3px;
  background: linear-gradient(180deg, #d8d2c4, #8d876f 55%, #5f5a49);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.6), inset 0 1px 0 rgba(255, 255, 255, 0.55);
  transition: transform 200ms cubic-bezier(0.22, 0.8, 0.3, 1), background 200ms ease;
}

.power.is-on .knob {
  transform: translateX(20px);
  background: linear-gradient(180deg, #ffd98a, #ffb454 55%, #d9822b);
}

.power-text {
  font-size: 9.5px;
  letter-spacing: 0.12em;
  color: var(--muted);
  display: flex;
  gap: 5px;
  align-items: baseline;
  white-space: nowrap;
}

.power-text b {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--muted);
  transition: color 200ms ease, text-shadow 200ms ease;
}

.power.is-on .power-text b {
  color: var(--amber-hot);
  text-shadow: 0 0 14px rgba(255, 180, 84, 0.6);
}

.control {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1 1 170px;
  min-width: 150px;
  padding: 0 4px;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  flex: 1;
  height: 22px;
  margin: 0;
  background: transparent;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 4px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(255, 180, 84, 0.75) var(--fill, 45%), rgba(255, 255, 255, 0.09) var(--fill, 45%));
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.5);
}

input[type="range"]::-moz-range-track {
  height: 4px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.09);
}

input[type="range"]::-moz-range-progress {
  height: 4px;
  border-radius: 999px;
  background: rgba(255, 180, 84, 0.75);
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  margin-top: -5px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #fff4d8, #ffb454 55%, #b96a1e);
  box-shadow: 0 0 0 3px rgba(255, 180, 84, 0.14), 0 2px 6px rgba(0, 0, 0, 0.5);
}

input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border: 0;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #fff4d8, #ffb454 55%, #b96a1e);
  box-shadow: 0 0 0 3px rgba(255, 180, 84, 0.14), 0 2px 6px rgba(0, 0, 0, 0.5);
}

.modes {
  display: flex;
  gap: 3px;
  padding: 3px;
  border-radius: 11px;
  background: rgba(0, 0, 0, 0.28);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.modes button {
  border: 0;
  border-radius: 8px;
  padding: 7px 10px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 12px;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: color 160ms ease, background 160ms ease, box-shadow 160ms ease;
}

.modes button:hover { color: var(--ink); }

.modes button.is-active {
  color: #23170a;
  background: linear-gradient(180deg, var(--amber-hot), var(--amber));
  box-shadow: 0 2px 14px -2px rgba(255, 170, 60, 0.55), inset 0 1px 0 rgba(255, 255, 255, 0.4);
  font-weight: 600;
}

@media (max-width: 640px) {
  .hud {
    flex-wrap: wrap;
    gap: 10px;
  }
  .brand { flex: 1 1 100%; }
  .brand-text p { white-space: normal; max-width: none; }
  .readout { flex: 1 1 100%; }
  .readout .gauge { flex: 1; justify-content: center; }
  .stage-hint { display: none; }
  .console { justify-content: center; }
  .modes { order: 3; flex: 1 1 100%; justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
  #board { transition: none; transform: none; }
  .knob { transition: none; }
}