:root {
  color-scheme: dark;
  --pill-bg: rgba(20, 22, 30, 0.85);
  --pill-border: rgba(120, 160, 255, 0.4);
  --pill-text: rgba(235, 245, 255, 0.9);
  --list-bg: rgba(10, 12, 20, 0.92);
  --list-border: rgba(90, 120, 220, 0.35);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #05060b;
  touch-action: none;
  font-family: "Inter", "SF Pro Text", system-ui, sans-serif;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
}

#flow-canvas {
  width: 100vw;
  height: 100vh;
  display: block;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(circle at 50% 50%, rgba(20, 30, 50, 0.15), rgba(5, 6, 11, 0.9));
}

.hud {
  position: fixed;
  top: calc(12px + env(safe-area-inset-top));
  left: calc(12px + env(safe-area-inset-left));
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(210, 220, 255, 0.75);
  background: rgba(6, 8, 14, 0.45);
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid rgba(120, 150, 255, 0.2);
  backdrop-filter: blur(6px);
  opacity: 0;
  transform: translateY(-6px);
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 2;
}

.hud.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.mode-selector {
  position: fixed;
  bottom: calc(20px + env(safe-area-inset-bottom));
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  z-index: 2;
}

.mode-pill {
  min-width: 160px;
  padding: 12px 20px;
  border-radius: 999px;
  border: 1px solid var(--pill-border);
  background: var(--pill-bg);
  color: var(--pill-text);
  font-size: 13px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-weight: 600;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(8px);
  touch-action: none;
}

.mode-pill:active {
  transform: scale(0.98);
}

.mode-list {
  display: grid;
  gap: 8px;
  background: var(--list-bg);
  border: 1px solid var(--list-border);
  padding: 12px;
  border-radius: 16px;
  box-shadow: 0 16px 30px rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(12px);
  opacity: 0;
  pointer-events: none;
  transform: translateY(6px) scale(0.98);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.mode-list.is-open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

.mode-item {
  border: 1px solid rgba(130, 160, 255, 0.2);
  background: rgba(8, 10, 18, 0.8);
  color: rgba(230, 240, 255, 0.9);
  padding: 8px 16px;
  border-radius: 10px;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: 600;
}

.mode-item.is-active {
  border-color: rgba(140, 190, 255, 0.75);
  box-shadow: 0 0 16px rgba(120, 180, 255, 0.3);
}

@media (max-width: 600px) {
  .mode-pill {
    min-width: 140px;
    font-size: 12px;
  }

  .mode-item {
    font-size: 11px;
  }
}