:root {
  --bg: #120c1d;
  --bg-soft: #1e152d;
  --ink: #f4ecd8;
  --ink-soft: #c9b89a;
  --accent: #7fd3ff;
  --accent-warm: #f0a73e;
  --danger: #ff5e5e;
  --glow: rgba(127, 211, 255, 0.35);
  --glow-warm: rgba(240, 167, 62, 0.35);
  --card: rgba(255, 255, 255, 0.04);
  --card-border: rgba(127, 211, 255, 0.22);
  --radius: 14px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: 'Inter', system-ui, sans-serif;
  line-height: 1.5;
  min-height: 100vh;
  overflow: hidden;
}

body.shade {
  background:
    radial-gradient(1200px 600px at 50% -100px, var(--glow), transparent 60%),
    radial-gradient(800px 400px at 100% 100%, rgba(127, 211, 255, 0.12), transparent 55%),
    linear-gradient(180deg, #120c1d 0%, #0a0612 100%);
}

.vignette {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(circle at center, transparent 40%, rgba(0,0,0,0.55) 100%);
  z-index: 5;
}

.dust {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle, rgba(127,211,255,0.18) 1px, transparent 1px),
    radial-gradient(circle, rgba(240,167,62,0.12) 1px, transparent 1px);
  background-size: 160px 160px, 240px 240px;
  background-position: 0 0, 60px 90px;
  opacity: 0.35;
  animation: drift 60s linear infinite;
  z-index: 0;
}

@keyframes drift {
  from { background-position: 0 0, 60px 90px; }
  to { background-position: 160px 320px, -180px 210px; }
}

.stage {
  position: relative;
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
}

/* Overlays */
.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 1.5rem;
  background: rgba(10, 6, 18, 0.72);
  backdrop-filter: blur(8px);
  z-index: 20;
  transition: opacity 0.25s ease;
}

.overlay[hidden] {
  display: none;
}

.overlay--menu {
  background:
    radial-gradient(circle at 50% 55%, rgba(127, 211, 255, 0.12), transparent 50%),
    rgba(10, 6, 18, 0.85);
}

.brand {
  font-family: 'Cinzel', serif;
  font-size: clamp(2.6rem, 8vw, 4.2rem);
  font-weight: 700;
  margin: 0 0 0.25rem;
  letter-spacing: 2px;
  text-shadow: 0 0 32px var(--glow);
  color: var(--accent);
}

.brand-sub {
  color: var(--ink-soft);
  margin: 0 0 2.25rem;
  font-size: 1rem;
}

.menu-buttons {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  width: min(260px, 80vw);
}

.btn {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.75rem 1.25rem;
  border-radius: 999px;
  border: 1px solid var(--card-border);
  background: var(--card);
  color: var(--ink);
  cursor: pointer;
  transition: transform 0.12s, box-shadow 0.18s, border-color 0.18s, background 0.18s;
}

.btn:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: 0 0 18px var(--glow);
}

.btn--primary {
  background: var(--accent);
  color: #0a0612;
  border-color: var(--accent);
  box-shadow: 0 0 22px var(--glow);
}

.btn--primary:hover {
  background: #a8e4ff;
  box-shadow: 0 0 30px var(--glow);
}

.btn--ghost {
  background: transparent;
  border-color: rgba(244, 236, 216, 0.25);
}

.btn--ghost:hover {
  background: rgba(244, 236, 216, 0.08);
}

.credit {
  margin-top: 2rem;
  font-size: 0.8rem;
  color: var(--ink-soft);
  opacity: 0.8;
}

.back-link {
  margin-top: 0.75rem;
  font-size: 0.8rem;
  color: var(--ink-soft);
  opacity: 0.8;
  text-decoration: none;
}
.back-link:hover { opacity: 1; text-decoration: underline; }

/* Cards */
.overlay--card {
  max-width: 560px;
  margin: auto;
  inset: auto;
  position: relative;
  padding: 2rem 2.25rem;
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  background: rgba(18, 12, 29, 0.92);
  box-shadow: 0 20px 50px rgba(0,0,0,0.45), 0 0 24px var(--glow);
}

.overlay--card h2 {
  font-family: 'Cinzel', serif;
  color: var(--accent);
  margin: 0 0 1.25rem;
  font-size: 1.6rem;
}

.rules {
  text-align: left;
  padding-left: 1.2rem;
  color: var(--ink-soft);
  margin: 0 0 1.25rem;
}

.rules li { margin-bottom: 0.65rem; }

kbd {
  font-family: inherit;
  font-size: 0.8em;
  background: rgba(244,236,216,0.12);
  padding: 0.15rem 0.4rem;
  border-radius: 6px;
  border: 1px solid rgba(244,236,216,0.2);
  color: var(--ink);
}

.tip {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin: 0 0 1.5rem;
}

/* Level select */
.select-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.level-btn {
  aspect-ratio: 1;
  border-radius: var(--radius);
  border: 1px solid var(--card-border);
  background: var(--card);
  color: var(--ink);
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.12s, border-color 0.18s, box-shadow 0.18s;
}

.level-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: 0 0 18px var(--glow);
}

.level-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.level-btn.cleared {
  border-color: var(--accent-warm);
  box-shadow: inset 0 0 14px var(--glow-warm);
}

/* HUD */
.hud {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem 1rem;
  z-index: 15;
  pointer-events: none;
}

.hud-left, .hud-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.hud-title {
  font-family: 'Cinzel', serif;
  color: var(--accent);
  font-weight: 700;
  font-size: 1rem;
  text-shadow: 0 0 10px var(--glow);
}

.hud-hint {
  font-size: 0.8rem;
  color: var(--ink-soft);
}

.hud-stat {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--ink);
}

.hud-stat#hearts { color: var(--danger); }

.iconbtn {
  pointer-events: auto;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--card-border);
  background: rgba(10, 6, 18, 0.6);
  color: var(--ink);
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  transition: transform 0.1s, border-color 0.15s, box-shadow 0.15s;
}

.iconbtn:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
  box-shadow: 0 0 12px var(--glow);
}

/* Board */
.board {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
}

#shade-canvas {
  width: 100%;
  height: 100%;
  image-rendering: auto;
}

/* Win / death */
.overlay--win {
  background: rgba(10, 6, 18, 0.85);
}

.overlay--win h2 {
  font-family: 'Cinzel', serif;
  font-size: 2rem;
  color: var(--accent);
  margin: 0 0 0.5rem;
  text-shadow: 0 0 24px var(--glow);
}

.win-glow {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--accent);
  filter: blur(36px);
  opacity: 0.35;
  margin-bottom: 1rem;
  animation: pulse 2.5s ease-in-out infinite;
}

.death-glow {
  background: var(--danger);
  opacity: 0.28;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.35; }
  50% { transform: scale(1.15); opacity: 0.5; }
}

.win-stats {
  color: var(--ink-soft);
  margin: 0 0 1.5rem;
}

.win-buttons {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

@media (max-width: 520px) {
  .overlay--card { padding: 1.5rem; margin: 1rem; }
  .select-grid { grid-template-columns: repeat(3, 1fr); }
  .hud-hint { display: none; }
  .win-buttons { flex-direction: column; width: min(240px, 70vw); }
}