:root {
  color-scheme: dark;
  --bg: #040816;
  --panel: #0f1731;
  --panel-border: #22325f;
  --text: #e8ecfb;
  --muted: #99a7d7;
  --accent: #3ec7ff;
  --danger: #ff7f9f;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100dvh;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: radial-gradient(1200px 700px at 20% -10%, #1a2d6e 0%, transparent 45%),
    radial-gradient(800px 500px at 80% 10%, #0e4f81 0%, transparent 42%),
    var(--bg);
  color: var(--text);
}

.layout {
  min-height: 100dvh;
  padding: 1.2rem;
  display: grid;
  place-items: center;
}

.card {
  width: min(100%, 1320px);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0.01) 100%),
    var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  padding: 1rem;
  display: grid;
  gap: 0.9rem;
}

.card-header h1 {
  margin: 0;
  font-size: clamp(1.2rem, 1.6vw, 1.8rem);
}

.card-header p {
  margin: 0.3rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.unity-container {
  position: relative;
  border-radius: 10px;
  border: 1px solid #2b3b68;
  overflow: hidden;
  background: #03060f;
}

#unity-canvas {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 16 / 9;
  background: #000;
}

.loading-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 0.7rem;
  background: linear-gradient(180deg, rgba(3, 8, 23, 0.8), rgba(6, 14, 35, 0.95));
  padding: 1rem;
}

.progress-shell {
  width: min(80vw, 460px);
  border: 1px solid #305495;
  border-radius: 999px;
  overflow: hidden;
  background: #101932;
}

.progress-bar {
  height: 12px;
  width: 0%;
  background: linear-gradient(90deg, #00e7ff, var(--accent));
  transition: width 0.15s linear;
}

#unity-status {
  text-align: center;
  color: var(--muted);
  font-size: 0.95rem;
}

.controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
}

#fullscreen-button {
  border: 1px solid #2b69b2;
  border-radius: 999px;
  padding: 0.55rem 1rem;
  background: #173f73;
  color: #eff6ff;
  font-weight: 600;
  cursor: pointer;
}

#fullscreen-button:hover {
  background: #1f5395;
}

.error {
  color: var(--danger);
  font-size: 0.9rem;
  min-height: 1.2rem;
}

@media (max-width: 760px) {
  .layout {
    padding: 0.7rem;
  }

  .card {
    padding: 0.7rem;
  }

  .controls {
    flex-direction: column;
    align-items: flex-start;
  }
}