:root {
  --slot: 52px;
  --ui: 'Segoe UI', 'Helvetica Neue', system-ui, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: #0b0f16;
  font-family: var(--ui);
  color: #fff;
  -webkit-font-smoothing: antialiased;
}

#gl { display: block; width: 100vw; height: 100vh; }

#water-overlay {
  position: fixed;
  inset: 0;
  z-index: 5;
  pointer-events: none;
  opacity: 0;
  background: linear-gradient(180deg, rgba(22, 78, 140, 0.55), rgba(10, 44, 88, 0.7));
  transition: opacity 0.18s linear;
}
#water-overlay.on { opacity: 1; }

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

#hud {
  position: fixed;
  inset: 0;
  pointer-events: none;
  user-select: none;
  z-index: 10;
}

#crosshair {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 22px;
  height: 22px;
  transform: translate(-50%, -50%);
  opacity: 0.9;
}
#crosshair::before,
#crosshair::after {
  content: '';
  position: absolute;
  background: #fff;
  mix-blend-mode: difference;
}
#crosshair::before { left: 50%; top: 0; width: 2px; height: 100%; margin-left: -1px; }
#crosshair::after { top: 50%; left: 0; height: 2px; width: 100%; margin-top: -1px; }

#debug {
  position: absolute;
  left: 12px;
  top: 12px;
  font: 12px/1.55 ui-monospace, 'SF Mono', Menlo, monospace;
  text-shadow: 1px 1px 0 rgba(0, 0, 0, 0.85);
  background: rgba(10, 14, 22, 0.42);
  border-left: 3px solid rgba(255, 255, 255, 0.5);
  padding: 8px 12px;
  border-radius: 3px;
}
#debug b { color: #ffd479; font-weight: 600; }

#toast {
  position: absolute;
  left: 50%;
  bottom: calc(var(--slot) + 46px);
  transform: translateX(-50%) translateY(6px);
  font: 600 14px/1 var(--ui);
  letter-spacing: 0.4px;
  padding: 8px 16px;
  border-radius: 999px;
  background: rgba(8, 12, 20, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.16);
  opacity: 0;
  transition: opacity 0.18s ease, transform 0.18s ease;
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

#hotbar {
  position: absolute;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  display: flex;
  gap: 4px;
  padding: 4px;
  background: rgba(8, 12, 20, 0.42);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 10px;
}
.slot {
  position: relative;
  width: var(--slot);
  height: var(--slot);
  display: grid;
  place-items: center;
  border-radius: 7px;
  background: rgba(255, 255, 255, 0.07);
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.25);
}
.slot.active {
  background: rgba(255, 255, 255, 0.2);
  box-shadow: inset 0 0 0 2px #fff, 0 0 14px rgba(255, 255, 255, 0.35);
}
.slot .icon { width: 38px; height: 38px; image-rendering: pixelated; }
.slot .num {
  position: absolute;
  right: 3px;
  bottom: 1px;
  font: 10px/1 var(--ui);
  color: rgba(255, 255, 255, 0.75);
  text-shadow: 1px 1px 0 #000;
}
.slot .name {
  position: absolute;
  left: 50%;
  top: -22px;
  transform: translateX(-50%);
  font: 600 11px/1 var(--ui);
  white-space: nowrap;
  opacity: 0;
  text-shadow: 1px 1px 0 #000;
  transition: opacity 0.15s;
}
.slot.active .name { opacity: 1; }

#keys {
  position: absolute;
  right: 12px;
  bottom: 14px;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 3px;
  font: 11px/1.3 var(--ui);
  color: rgba(255, 255, 255, 0.72);
  text-shadow: 1px 1px 0 rgba(0, 0, 0, 0.8);
}
#keys b { color: #fff; }

#hud.compact #debug,
#hud.compact #keys { display: none; }

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

#overlay, #loading {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  z-index: 20;
  background: radial-gradient(120% 120% at 50% 0%, rgba(20, 34, 58, 0.5), rgba(6, 9, 14, 0.74));
  backdrop-filter: blur(2px);
  transition: opacity 0.35s ease, visibility 0.35s;
}
#overlay.hidden, #loading.hidden { opacity: 0; visibility: hidden; pointer-events: none; }
#overlay.peek { display: none !important; }   /* used by the screenshot harness */

.panel {
  text-align: center;
  padding: 34px 40px;
  border-radius: 16px;
  background: rgba(12, 16, 24, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.14);
  box-shadow: 0 26px 60px rgba(0, 0, 0, 0.5);
  max-width: 560px;
}
.panel h1 {
  margin: 0;
  font-size: 42px;
  letter-spacing: 1px;
  background: linear-gradient(180deg, #fff, #9fc3ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.panel .sub { margin: 6px 0 18px; color: rgba(255, 255, 255, 0.7); font-size: 14px; }
.panel .hints {
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
  font-size: 13px;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.78);
}
.panel b { color: #ffd479; }

button {
  font: 600 15px var(--ui);
  color: #10151f;
  background: linear-gradient(180deg, #fff, #cddcff);
  border: 0;
  border-radius: 999px;
  padding: 12px 30px;
  cursor: pointer;
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.35);
}
button:hover { transform: translateY(-1px); }

.track {
  width: 320px;
  height: 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.14);
  overflow: hidden;
  margin: 0 auto;
}
#bar {
  height: 100%;
  width: 0;
  border-radius: 999px;
  background: linear-gradient(90deg, #8fd0ff, #ffd479);
  transition: width 0.2s ease;
}
#progress-text { font-size: 12px; color: rgba(255, 255, 255, 0.7); }