*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: #000;
  font-family: "SF Mono", "Fira Code", "Fira Mono", Menlo, monospace;
}

header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 20;
  padding: 0.75rem 1rem;
}

header a {
  color: hsl(0 0% 80% / 0.6);
  text-decoration: none;
  font-size: 0.75rem;
  transition: color 0.2s ease;
}

header a:hover {
  color: hsl(0 0% 95% / 0.9);
}

main {
  width: 100dvw;
  height: 100dvh;
  position: relative;
}

#canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* UI コントロール */
#controls {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 30;
  padding: 0.75rem 1.5rem;
  background: rgba(0, 0, 0, 0.7);
  color: #fff;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  align-items: center;
}

#time-display {
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  opacity: 0.9;
}

#time-slider {
  width: 100%;
  max-width: 40rem;
  cursor: pointer;
  accent-color: #4488ff;
}

/* 情報パネル */
#info-panel {
  position: fixed;
  top: 0.75rem;
  right: 0.75rem;
  z-index: 20;
  padding: 0.625rem 0.875rem;
  background: rgba(0, 0, 0, 0.6);
  border: 0.0625rem solid rgba(255, 255, 255, 0.15);
  border-radius: 0.375rem;
  color: rgba(255, 255, 255, 0.85);
  font-family: "SF Mono", "Fira Code", "Fira Mono", Menlo, monospace;
  font-size: 0.6875rem;
  line-height: 1.6;
  pointer-events: none;
}

/* モバイル対応 */
@media (max-width: 48rem) {
  #controls {
    padding: 0.5rem 0.75rem;
  }

  #time-slider {
    height: 2rem;
  }

  #info-panel {
    font-size: 0.5625rem;
    padding: 0.375rem 0.5rem;
    top: 0.5rem;
    right: 0.5rem;
  }
}