:root {
  --bg-0: #06080f;
  --bg-1: #0c1020;
  --ink: #e6f1ff;
  --dim: #7a8aa8;
  --neon: #5cf2ff;
  --neon-2: #ff5cf2;
  --warn: #ff5c6b;
  --gold: #ffd35c;
  --grid: #1a2440;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  width: 100%;
  background: var(--bg-0);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  overscroll-behavior: none;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
}

#app {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background:
    radial-gradient(circle at 20% 10%, #122047 0%, transparent 60%),
    radial-gradient(circle at 80% 90%, #2a0d3d 0%, transparent 55%),
    var(--bg-0);
}

#game {
  display: block;
  width: 100%;
  height: 100%;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  background: transparent;
  touch-action: none;
}

/* HUD */
.hud {
  position: absolute;
  top: calc(var(--safe-top) + 10px);
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  padding: 0 14px;
  pointer-events: none;
  z-index: 5;
}
.hud-left, .hud-right { display: flex; gap: 10px; align-items: center; pointer-events: auto; }
.hud-center { display: flex; flex-direction: column; align-items: center; gap: 2px; pointer-events: none; }
#level-name {
  font-weight: 700;
  letter-spacing: 0.12em;
  font-size: 13px;
  color: var(--neon);
  text-shadow: 0 0 8px rgba(92,242,255,0.6);
  background: rgba(6,8,15,0.55);
  padding: 6px 10px;
  border-radius: 6px;
  border: 1px solid rgba(92,242,255,0.25);
}
.hud-timer {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-weight: 800;
  font-size: 18px;
  color: var(--ink);
  text-shadow: 0 0 8px rgba(92,242,255,0.4);
  background: rgba(6,8,15,0.55);
  padding: 4px 10px;
  border-radius: 6px;
  border: 1px solid rgba(255,255,255,0.12);
  letter-spacing: 0.08em;
  font-variant-numeric: tabular-nums;
}
.hud-best {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 10px;
  color: var(--gold);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  text-shadow: 0 0 6px rgba(255,211,92,0.5);
}

/* Intro toast — shown briefly at the top when entering a level. */
.intro-toast {
  position: absolute;
  top: calc(var(--safe-top) + 56px);
  left: 50%;
  transform: translateX(-50%);
  z-index: 6;
  background: rgba(6, 8, 15, 0.78);
  border: 1px solid rgba(92, 242, 255, 0.35);
  color: var(--ink);
  padding: 9px 16px;
  border-radius: 8px;
  font-size: 13px;
  letter-spacing: 0.05em;
  text-align: center;
  max-width: min(520px, 86vw);
  pointer-events: none;
  text-shadow: 0 0 8px rgba(92, 242, 255, 0.25);
  animation: intro-toast-in 220ms ease-out;
}
.intro-toast.hidden { display: none; }
.intro-toast.fading { animation: intro-toast-out 320ms ease-out forwards; }
@keyframes intro-toast-in {
  from { opacity: 0; transform: translate(-50%, -10px); }
  to   { opacity: 1; transform: translate(-50%, 0); }
}
@keyframes intro-toast-out {
  from { opacity: 1; transform: translate(-50%, 0); }
  to   { opacity: 0; transform: translate(-50%, -8px); }
}

/* Touch helper layer - pointer-events: none so swipes pass through to the canvas */
.touch {
  position: absolute;
  inset: 0;
  z-index: 4;
  pointer-events: none;
}
.touch-grid { display: none; }

/* Overlays */
.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 18px;
  z-index: 10;
  background:
    radial-gradient(circle at 50% 30%, rgba(92,242,255,0.08) 0%, transparent 60%),
    rgba(6,8,15,0.92);
  padding: calc(var(--safe-top) + 24px) 20px calc(var(--safe-bottom) + 24px);
  text-align: center;
}
.overlay.hidden, .hud.hidden, .touch.hidden { display: none; }

.title {
  font-weight: 900;
  font-size: clamp(40px, 9vw, 96px);
  letter-spacing: 0.04em;
  line-height: 0.95;
  display: flex;
  flex-direction: column;
  animation: title-float 6s ease-in-out infinite;
}
.t-grav {
  color: var(--ink);
  text-shadow: 0 0 16px rgba(230, 241, 255, 0.18);
  animation: t-grav-glow 4s ease-in-out infinite;
}
.t-flip {
  color: var(--neon);
  text-shadow: 0 0 12px rgba(92,242,255,0.7), 0 0 28px rgba(92,242,255,0.4);
  transform: rotate(180deg);
  animation: t-flip-rot 9s ease-in-out infinite, t-flip-glow 2.4s ease-in-out infinite;
  transform-origin: 50% 50%;
}
.t-lab {
  color: var(--neon-2);
  text-shadow: 0 0 12px rgba(255,92,242,0.7);
  animation: t-lab-glow 3.2s ease-in-out infinite;
}

@keyframes title-float {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-6px); }
}
@keyframes t-grav-glow {
  0%, 100% { text-shadow: 0 0 16px rgba(230, 241, 255, 0.16); }
  50%      { text-shadow: 0 0 22px rgba(230, 241, 255, 0.32); }
}
@keyframes t-flip-rot {
  0%   { transform: rotate(180deg); }
  46%  { transform: rotate(180deg); }
  50%  { transform: rotate(540deg); }
  96%  { transform: rotate(540deg); }
  100% { transform: rotate(900deg); }
}
@keyframes t-flip-glow {
  0%, 100% { text-shadow: 0 0 10px rgba(92,242,255,0.55), 0 0 22px rgba(92,242,255,0.28); }
  50%      { text-shadow: 0 0 18px rgba(92,242,255,0.95), 0 0 38px rgba(92,242,255,0.55); }
}
@keyframes t-lab-glow {
  0%, 100% { text-shadow: 0 0 10px rgba(255,92,242,0.55); }
  50%      { text-shadow: 0 0 20px rgba(255,92,242,0.95), 0 0 36px rgba(255,92,242,0.45); }
}

.tagline {
  color: var(--dim);
  font-size: clamp(13px, 2.4vw, 16px);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.menu-buttons {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: min(320px, 80vw);
  margin-top: 8px;
}

button {
  font-family: inherit;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 14px 18px;
  border-radius: 8px;
  border: 1px solid rgba(230,241,255,0.25);
  background: rgba(255,255,255,0.04);
  color: var(--ink);
  cursor: pointer;
  transition: transform 80ms ease, background 120ms ease, border-color 120ms ease;
}
button:hover { background: rgba(255,255,255,0.08); border-color: rgba(230,241,255,0.5); }
button:active { transform: scale(0.97); }

button.primary {
  background: linear-gradient(180deg, rgba(92,242,255,0.2), rgba(92,242,255,0.05));
  border-color: rgba(92,242,255,0.6);
  color: var(--neon);
  text-shadow: 0 0 8px rgba(92,242,255,0.6);
}
button.ghost {
  background: rgba(6,8,15,0.55);
  border: 1px solid rgba(230,241,255,0.2);
  padding: 8px 12px;
  font-size: 14px;
  pointer-events: auto;
}

.footer-hint {
  position: absolute;
  bottom: calc(var(--safe-bottom) + 14px);
  left: 0; right: 0;
  text-align: center;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--dim);
  padding: 0 16px;
}

h2 {
  font-size: clamp(22px, 4vw, 32px);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--neon);
  text-shadow: 0 0 10px rgba(92,242,255,0.5);
  margin-bottom: 8px;
}

.how-list {
  list-style: none;
  text-align: left;
  width: min(420px, 90vw);
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 15px;
  color: #c9d6ee;
}
.how-list b { color: var(--neon); }

.win-title {
  font-size: clamp(40px, 8vw, 72px);
  color: var(--gold);
  text-shadow: 0 0 14px rgba(255,211,92,0.7);
  letter-spacing: 0.18em;
}
.win-stats { color: var(--dim); letter-spacing: 0.12em; text-transform: uppercase; font-size: 13px; }

/* Level grid */
.level-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(64px, 1fr));
  gap: 10px;
  width: min(560px, 92vw);
  max-height: 60vh;
  overflow-y: auto;
  padding: 8px;
}
.level-cell {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  border: 1px solid rgba(230,241,255,0.18);
  background: rgba(255,255,255,0.03);
  cursor: pointer;
  font-weight: 800;
  font-size: 14px;
  color: var(--dim);
  transition: transform 80ms ease, border-color 120ms ease;
}
.level-cell.unlocked { color: var(--ink); border-color: rgba(92,242,255,0.35); }
.level-cell.cleared {
  color: var(--gold);
  border-color: rgba(255,211,92,0.5);
  background: rgba(255,211,92,0.06);
  text-shadow: 0 0 8px rgba(255,211,92,0.5);
}
.level-cell.locked { opacity: 0.35; cursor: not-allowed; }
.level-cell:not(.locked):hover { transform: scale(1.06); }
.world-header {
  grid-column: 1 / -1;
  text-align: left;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--neon-2);
  padding: 6px 4px 2px;
  border-bottom: 1px dashed rgba(255,92,242,0.2);
  margin-top: 6px;
}
.world-header:first-child { margin-top: 0; }