/* ── Reset ──────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --pad:       28px;
  --wall:      #00e5ff;
  --wall-glow: rgba(0,229,255,0.35);
  --bg:        #080c10;
  --start:     #39ff14;
  --end:       #ff2d6b;
  --text:      #00e5ff;
  --panel-w:   280px;
  --panel-bg:  rgba(8,14,20,0.97);
}

html, body {
  width: 100%; height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: 'Share Tech Mono', monospace;
  overflow: hidden;
  touch-action: none;
}

/* Dot-grid background */
body::before {
  content: '';
  position: fixed; inset: 0;
  background-image: radial-gradient(circle, rgba(0,229,255,0.10) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
  z-index: 0;
}

/* ── Top UI bar ─────────────────────────────────────── */
#ui {
  position: fixed;
  top: var(--pad); left: 60%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 16px;
  z-index: 10;
}

h1 {
  font-family: 'Orbitron', sans-serif;
  font-weight: 900;
  font-size: clamp(13px, 2vw, 22px);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--wall);
  text-shadow: 0 0 12px var(--wall), 0 0 28px var(--wall-glow);
  white-space: nowrap;
}

/* ── Buttons (shared) ───────────────────────────────── */
button {
  font-family: 'Share Tech Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--bg);
  background: var(--wall);
  border: none;
  padding: 7px 15px;
  cursor: pointer;
  clip-path: polygon(6px 0%, 100% 0%, calc(100% - 6px) 100%, 0% 100%);
  box-shadow: 0 0 14px var(--wall-glow);
  transition: transform 0.1s, box-shadow 0.15s;
}
button:hover  { transform: scale(1.06); box-shadow: 0 0 22px var(--wall); }
button:active { transform: scale(0.97); }

#btn-tilt {
  background: #ff9f00;
  box-shadow: 0 0 14px rgba(255,159,0,0.4);
}
#btn-calibrate {
  background: #a259ff;
  box-shadow: 0 0 14px rgba(162,89,255,0.4);
}

/* ── Hamburger button ───────────────────────────────── */
#btn-settings {
  position: fixed;
  top: calc(var(--pad) - 2px);
  left: var(--pad);
  font-size: 18px;
  padding: 6px 12px;
  clip-path: none;
  z-index: 20;
  background: transparent;
  color: var(--wall);
  box-shadow: none;
  border: 1px solid rgba(0,229,255,0.3);
}
#btn-settings:hover {
  background: rgba(0,229,255,0.08);
  box-shadow: 0 0 12px var(--wall-glow);
  transform: none;
}

/* ── Settings overlay (backdrop) ───────────────────── */
#settings-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 24;
}
#settings-overlay.show { display: block; }

/* ── Settings panel ─────────────────────────────────── */
#settings-panel {
  position: fixed;
  top: 0; right: 0;
  width: var(--panel-w);
  height: 100%;
  background: var(--panel-bg);
  border-left: 1px solid rgba(0,229,255,0.25);
  box-shadow: -6px 0 40px rgba(0,0,0,0.7);
  z-index: 25;
  padding: 0;
  transform: translateX(100%);
  transition: transform 0.28s cubic-bezier(0.4,0,0.2,1);
}
#settings-panel.open { transform: translateX(0); }

#settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 20px 16px;
  border-bottom: 1px solid rgba(0,229,255,0.15);
  font-family: 'Orbitron', sans-serif;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.25em;
  color: var(--wall);
}
#settings-header button {
  clip-path: none;
  padding: 4px 10px;
  font-size: 13px;
  background: transparent;
  color: rgba(0,229,255,0.5);
  border: 1px solid rgba(0,229,255,0.2);
  box-shadow: none;
}
#settings-header button:hover {
  color: var(--wall);
  background: rgba(0,229,255,0.08);
  transform: none;
}

.setting-group {
  padding: 22px 20px 0;
}
.setting-group label {
  display: block;
  font-family: 'Orbitron', sans-serif;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.25em;
  color: rgba(0,229,255,0.7);
  margin-bottom: 14px;
}
.setting-labels {
  display: flex;
  justify-content: space-between;
  font-size: 9px;
  letter-spacing: 0.1em;
  opacity: 0.35;
  margin-top: 8px;
}
.setting-note {
  margin-top: 10px;
  font-size: 9px;
  letter-spacing: 0.1em;
  color: #ff9f00;
  opacity: 0.7;
}

/* ── Range slider ───────────────────────────────────── */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 3px;
  background: rgba(0,229,255,0.18);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 15px; height: 15px;
  background: var(--wall);
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%); /* diamond */
  cursor: pointer;
  box-shadow: 0 0 8px var(--wall);
}
input[type="range"]::-moz-range-thumb {
  width: 15px; height: 15px;
  background: var(--wall);
  border: none;
  border-radius: 0;
  cursor: pointer;
  box-shadow: 0 0 8px var(--wall);
}

/* ── START / END badges ─────────────────────────────── */
#labels { position: fixed; inset: 0; pointer-events: none; z-index: 5; }

.badge {
  position: absolute;
  font-family: 'Orbitron', sans-serif;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.18em;
  padding: 3px 8px;
  clip-path: polygon(4px 0%, 100% 0%, calc(100% - 4px) 100%, 0% 100%);
}
#badge-start { color: #080c10; background: var(--start); box-shadow: 0 0 14px var(--start); }
#badge-end   { color: #080c10; background: var(--end);   box-shadow: 0 0 14px var(--end); }

/* ── Canvas ─────────────────────────────────────────── */
canvas { position: fixed; z-index: 1; }

/* ── Footer info ────────────────────────────────────── */
#seed-display {
  font-size: 9px; letter-spacing: 0.15em;
  opacity: 0.3;
  position: fixed; bottom: 10px; left: 50%; transform: translateX(-50%);
  z-index: 10;
}
#hint {
  font-size: 9px; letter-spacing: 0.12em;
  opacity: 0.28;
  position: fixed; bottom: 10px; left: var(--pad);
  z-index: 10;
}

/* ── Win overlay ────────────────────────────────────── */
#win-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(8,12,16,0.88);
  z-index: 30;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  animation: fadeIn 0.5s ease;
}
#win-overlay.show { display: flex; }

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

#win-overlay h2 {
  font-family: 'Orbitron', sans-serif;
  font-weight: 900;
  font-size: clamp(28px, 8vw, 72px);
  letter-spacing: 0.25em;
  color: var(--start);
  animation: pulse 1.2s ease-in-out infinite alternate;
}
@keyframes pulse {
  from { text-shadow: 0 0 20px var(--start), 0 0 50px rgba(57,255,20,0.3); }
  to   { text-shadow: 0 0 50px var(--start), 0 0 120px rgba(57,255,20,0.6); }
}
#win-overlay p {
  margin-top: 20px;
  font-size: 11px;
  letter-spacing: 0.3em;
  opacity: 0.45;
  text-transform: uppercase;
}