:root {
  --bg-deep: #10213b;
  --bg-mid: #1f4d72;
  --bg-soft: #7ed7ff;
  --panel: rgba(8, 19, 39, 0.78);
  --accent: #ffd166;
  --text: #f7fbff;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(255, 236, 184, 0.2), transparent 28%),
    linear-gradient(180deg, var(--bg-soft), var(--bg-mid) 50%, var(--bg-deep));
}

body {
  min-height: 100vh;
  overflow: hidden;
  background:
    radial-gradient(circle at top, rgba(255, 236, 184, 0.18), transparent 28%),
    linear-gradient(180deg, #6fcdf7, #254f7f 58%, #152742);
}

.app-shell {
  position: relative;
  width: 100vw;
  height: 100vh;
}

canvas {
  width: 100vw;
  height: 100vh;
  background: transparent;
  image-rendering: auto;
  display: block;
}

.touch-hint {
  position: absolute;
  left: 50%;
  bottom: 16px;
  transform: translateX(-50%);
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  padding: 8px 16px;
  font-size: 0.9rem;
  text-align: center;
  backdrop-filter: blur(8px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.22);
}

@media (max-width: 800px) {
  .touch-hint {
    font-size: 0.8rem;
    bottom: 10px;
    max-width: calc(100vw - 20px);
  }
}