:root {
  color-scheme: dark;
  --panel: rgba(18, 24, 31, 0.9);
  --line: #2d3845;
  --text: #f5f7fb;
  --muted: #aab4c0;
  --green: #4fd3a7;
  --pink: #ff6d8f;
  --gold: #f5c85c;
  --blue: #78a9ff;
  --shadow: 0 22px 70px rgba(0, 0, 0, 0.36);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at 46% 28%, rgba(79, 211, 167, 0.12), transparent 28rem),
    radial-gradient(circle at 70% 66%, rgba(255, 109, 143, 0.1), transparent 26rem),
    linear-gradient(135deg, #080b0d 0%, #14181d 48%, #101923 100%);
  color: var(--text);
}

button,
select,
input {
  font: inherit;
}

.app {
  display: grid;
  grid-template-columns: minmax(270px, 330px) minmax(420px, 1fr) minmax(270px, 330px);
  gap: 18px;
  min-height: 100vh;
  padding: 18px;
}

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

.panel > section,
.controls,
.activity,
.cards article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.left-panel > .eyebrow,
.left-panel > h1,
.left-panel > .intro {
  margin-left: 18px;
  margin-right: 18px;
}

.eyebrow {
  margin-top: 18px;
  margin-bottom: 8px;
  color: var(--green);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin-top: 0;
  margin-bottom: 12px;
  font-size: clamp(2.4rem, 5vw, 4.4rem);
  line-height: 0.92;
}

h2 {
  margin: 0 0 10px;
  font-size: 1rem;
}

p,
li,
dd {
  color: var(--muted);
  line-height: 1.55;
}

.intro {
  margin-top: 0;
}

.controls,
.activity,
.panel > section {
  padding: 18px;
}

.section-title,
.topbar,
.actions,
.switches {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.section-title {
  margin-bottom: 14px;
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.icon-btn,
button {
  min-height: 40px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: var(--green);
  color: #05241d;
  cursor: pointer;
  font-weight: 900;
}

.icon-btn {
  width: 40px;
  border-color: var(--line);
  background: #18222c;
  color: var(--text);
}

.field {
  display: grid;
  gap: 8px;
  margin: 12px 0;
  color: var(--muted);
  font-size: 0.9rem;
}

select {
  height: 42px;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #0b1117;
  color: var(--text);
  padding: 0 10px;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--pink);
}

.switches {
  flex-wrap: wrap;
  margin: 16px 0;
  color: var(--muted);
}

.actions button {
  flex: 1;
  padding: 0 12px;
}

#xrBtn {
  background: var(--blue);
  color: #071426;
}

.answers {
  display: grid;
  gap: 8px;
}

.answers button {
  min-height: 44px;
  width: 100%;
  padding: 8px 10px;
  border-color: var(--line);
  background: #18222c;
  color: var(--text);
  text-align: left;
}

.answers button.correct {
  border-color: var(--green);
  background: rgba(79, 211, 167, 0.22);
}

.answers button.wrong {
  border-color: var(--pink);
  background: rgba(255, 109, 143, 0.2);
}

.next-step {
  margin: 8px 0 0;
  color: var(--green);
  font-weight: 800;
}

.stage {
  display: grid;
  grid-template-rows: auto minmax(450px, 1fr) auto;
  gap: 14px;
  min-width: 0;
}

.topbar {
  min-height: 52px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(8, 11, 13, 0.82);
}

.topbar > span {
  color: var(--muted);
  font-size: 0.84rem;
  text-align: right;
}

.live {
  display: flex;
  align-items: center;
  gap: 9px;
  min-width: 0;
}

.pulse {
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 18px var(--green);
}

.viewport {
  position: relative;
  overflow: hidden;
  min-height: 500px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    radial-gradient(circle at 50% 40%, rgba(120, 169, 255, 0.2), transparent 24rem),
    #070b10;
  background-size: 48px 48px, 48px 48px, auto, auto;
  box-shadow: var(--shadow);
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 500px;
}

.label {
  position: absolute;
  min-width: 104px;
  padding: 7px 9px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  background: rgba(8, 11, 13, 0.75);
  color: var(--text);
  font-size: 0.78rem;
  font-weight: 900;
  backdrop-filter: blur(10px);
}

.label-character {
  left: 48%;
  top: 18%;
}

.label-prop {
  left: 18%;
  top: 62%;
}

.label-space {
  right: 12%;
  top: 36%;
}

.hide-labels .label {
  display: none;
}

.reticle {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 92px;
  height: 92px;
  border: 2px solid rgba(79, 211, 167, 0.65);
  border-radius: 50%;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -50%);
}

.xr-active {
  outline: 3px solid rgba(79, 211, 167, 0.7);
}

.xr-active .reticle {
  opacity: 1;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.cards article {
  padding: 14px;
}

.cards span {
  display: block;
  margin-bottom: 8px;
  color: var(--gold);
  font-size: 0.74rem;
  font-weight: 900;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.cards p,
.activity p,
.right-panel p,
.right-panel li,
.right-panel dd {
  margin-bottom: 0;
  font-size: 0.9rem;
}

ul {
  margin: 0;
  padding-left: 18px;
}

dl {
  display: grid;
  gap: 12px;
  margin: 0;
}

dt {
  color: var(--text);
  font-size: 0.76rem;
  font-weight: 900;
  text-transform: uppercase;
}

dd {
  margin: 3px 0 0;
}

@media (max-width: 1120px) {
  .app {
    grid-template-columns: 310px minmax(0, 1fr);
  }

  .right-panel {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 780px) {
  .app,
  .right-panel,
  .cards {
    grid-template-columns: 1fr;
  }

  .app {
    padding: 10px;
  }

  h1 {
    font-size: 2.7rem;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    padding: 10px 12px;
  }

  .topbar > span {
    text-align: left;
  }

  .viewport,
  canvas {
    min-height: 430px;
  }
}