:root {
  --bg: #02030a;
  --fg: #e6e9f5;
  --muted: #8d92a6;
  --accent: #00f0ff;
  --magenta: #ff3df0;
  --lime: #b6ff00;
  --red: #ff3344;
  --warn: #ff8c00;
  --frame-top: #060a14;
  --frame-bot: #02030a;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  min-height: 100dvh;
}

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 1rem;
}

.back {
  position: fixed;
  top: 1rem;
  left: 1rem;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  transition: color 0.15s ease, background 0.15s ease;
  z-index: 100;
}
.back:hover { color: var(--fg); background: rgba(255,255,255,0.05); }

.stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
}

.frame {
  position: relative;
  line-height: 0;
  width: min(96vw, 1100px);
  aspect-ratio: 16 / 9;
  border-radius: 8px;
  overflow: hidden;
  background: linear-gradient(to bottom, var(--frame-top) 0%, var(--frame-bot) 100%);
  box-shadow:
    0 10px 40px rgba(0, 0, 0, 0.55),
    0 0 0 1px rgba(0, 240, 255, 0.10),
    0 0 32px rgba(0, 240, 255, 0.06);
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
  background: transparent;
  cursor: crosshair;
}

/* --- HUD overlays --- */

.hud {
  position: absolute;
  inset: 0;
  pointer-events: none;
  font-variant-numeric: tabular-nums;
  user-select: none;
}

.hud-top-left,
.hud-top-right,
.hud-bottom {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  font-weight: 600;
}
.hud-top-left  { top: 0.8rem; left: 0.9rem; }
.hud-top-right { top: 0.8rem; right: 3rem; flex-direction: column; align-items: flex-end; gap: 0.2rem; }
.hud-bottom    { bottom: 0.8rem; left: 50%; transform: translateX(-50%); }

.stat-label {
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}
.hp-bar {
  width: 110px;
  height: 8px;
  background: rgba(255, 51, 68, 0.15);
  border: 1px solid rgba(255, 51, 68, 0.3);
  border-radius: 2px;
  overflow: hidden;
}
.hp-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--red), #ff7780);
  width: 100%;
  box-shadow: 0 0 8px rgba(255, 51, 68, 0.7);
  transition: width 0.2s ease;
}
.hp-num {
  color: var(--red);
  text-shadow: 0 0 6px rgba(255, 51, 68, 0.6);
  font-size: 0.95rem;
  min-width: 32px;
  text-align: right;
}

.stat {
  background: rgba(2, 3, 10, 0.55);
  border: 1px solid rgba(0, 240, 255, 0.18);
  border-radius: 4px;
  padding: 0.2rem 0.5rem;
  color: var(--accent);
  text-shadow: 0 0 6px rgba(0, 240, 255, 0.5);
}
.stat.dim {
  border-color: rgba(141, 146, 166, 0.18);
  color: var(--muted);
  text-shadow: none;
}
#stat-wave {
  border-color: rgba(255, 61, 240, 0.25);
  color: var(--magenta);
  text-shadow: 0 0 6px rgba(255, 61, 240, 0.55);
}

.hint {
  background: rgba(2, 3, 10, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 4px;
  padding: 0.25rem 0.6rem;
  color: rgba(230, 233, 245, 0.78);
  text-shadow: 0 0 4px rgba(0, 240, 255, 0.25);
  font-size: 0.78rem;
}

/* --- Crosshair (4 small ticks around a center dot, classic minimal) --- */

.crosshair {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 18px;
  height: 18px;
}
.crosshair span {
  position: absolute;
  background: var(--accent);
  box-shadow: 0 0 4px rgba(0, 240, 255, 0.85);
}
.crosshair span:nth-child(1) { left: 8px; top: 0; width: 2px; height: 5px; }
.crosshair span:nth-child(2) { left: 8px; bottom: 0; width: 2px; height: 5px; }
.crosshair span:nth-child(3) { top: 8px; left: 0; width: 5px; height: 2px; }
.crosshair span:nth-child(4) { top: 8px; right: 0; width: 5px; height: 2px; }

/* --- Sound toggle --- */

.sound-toggle {
  position: absolute;
  top: 0.6rem;
  right: 0.7rem;
  pointer-events: auto;
  background: rgba(2, 3, 10, 0.55);
  color: var(--fg);
  border: 1px solid rgba(0, 240, 255, 0.20);
  border-radius: 6px;
  width: 2rem;
  height: 2rem;
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s ease, border-color 0.15s ease;
  padding: 0;
}
.sound-toggle:hover {
  background: rgba(0, 240, 255, 0.14);
  border-color: rgba(0, 240, 255, 0.55);
}
.sound-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* --- State overlays --- */

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(2, 3, 10, 0.65);
  backdrop-filter: blur(2px);
  pointer-events: auto;
  cursor: pointer;
}
.overlay.hidden { display: none; }
.overlay-card {
  text-align: center;
  padding: 1.5rem 2.5rem;
  border-radius: 10px;
}
.overlay-card h1 {
  margin: 0 0 0.6rem 0;
  font-size: 1.85rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--accent);
  text-shadow: 0 0 14px rgba(0, 240, 255, 0.65);
}
.overlay-card p {
  margin: 0.25rem 0;
  font-size: 0.95rem;
  color: rgba(230, 233, 245, 0.85);
}
.overlay-card .meta-line {
  margin-top: 0.6rem;
  color: var(--muted);
  font-size: 0.8rem;
}

/* --- Footer --- */

.meta {
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
  line-height: 1.6;
}
.meta strong { color: var(--fg); }
.meta kbd {
  display: inline-block;
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid rgba(0, 240, 255, 0.25);
  border-radius: 3px;
  padding: 0 0.35rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.75rem;
  color: var(--accent);
}

.legal-strip {
  color: var(--muted);
  font-size: 0.75rem;
  text-align: center;
  max-width: min(96vw, 1100px);
  line-height: 1.6;
  padding: 0.25rem 0.5rem;
  opacity: 0.8;
}
.legal-strip a {
  color: var(--muted);
  text-decoration: underline;
  text-decoration-color: rgba(141, 146, 166, 0.3);
}
.legal-strip a:hover {
  color: var(--fg);
  text-decoration-color: currentColor;
}