:root {
  color-scheme: dark;
  --bg-top: #13253a;
  --bg-bottom: #04070f;
  --hud-bg: rgba(9, 14, 24, 0.68);
  --text: #eff6ff;
  --muted: #b2bfd6;
  --accent: #ffd28a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 50% -20%, #28456c 0%, var(--bg-top) 35%, var(--bg-bottom) 100%);
  min-height: 100vh;
}

.app {
  display: grid;
  gap: 0.8rem;
  width: min(1200px, 98vw);
  margin: 0 auto;
  padding: 0.8rem 0.8rem 1.2rem;
}

.hud {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.7rem;
  flex-wrap: wrap;
  padding: 0.7rem 1rem;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 14px;
  background: var(--hud-bg);
  backdrop-filter: blur(4px);
}

.hud h1 {
  margin: 0;
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  letter-spacing: 0.03em;
}

.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--muted);
  font-size: 0.9rem;
  user-select: none;
}

.toggle input {
  accent-color: #dcb070;
}

.toggle select,
.toggle input[type="range"] {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 6px;
  padding: 0.15rem 0.4rem;
}

.toggle select {
  min-width: 90px;
}

.range-toggle input[type="range"] {
  width: 94px;
  padding: 0;
}

.stage-wrap {
  position: relative;
  width: 100%;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.45);
}

#gameCanvas {
  display: block;
  width: 100%;
  height: auto;
  background: transparent;
}

.vignette {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(circle at center, transparent 35%, rgba(0, 0, 0, 0.42) 100%);
}

.controls {
  color: var(--muted);
  line-height: 1.45;
  padding: 0 0.2rem;
}

.controls p {
  margin: 0.2rem 0;
}

kbd {
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 0.06rem 0.35rem;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
}

.overlay {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(4, 7, 15, 0.66);
  padding: 1rem;
}

.overlay.hidden {
  display: none;
}

.panel {
  width: min(540px, 95vw);
  background: linear-gradient(180deg, rgba(25, 35, 52, 0.95), rgba(11, 17, 27, 0.95));
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 14px;
  padding: 1.1rem 1.15rem;
}

.panel h2 {
  margin: 0 0 0.55rem;
}

.panel p {
  margin: 0 0 1rem;
  color: var(--muted);
}

.small-note {
  font-size: 0.88rem;
  color: #d2b689;
}

.panel button {
  border: 0;
  border-radius: 9px;
  padding: 0.58rem 1rem;
  color: #1f1306;
  background: linear-gradient(180deg, #ffe3aa 0%, var(--accent) 100%);
  font-weight: 700;
  cursor: pointer;
}

.panel button:hover {
  filter: brightness(1.06);
}