:root {
  --bg: #0e0e1a;
  --panel: rgba(20, 20, 36, 0.72);
  --accent: #ff5577;
  --accent-2: #59c2ff;
  --text: #f4f4ff;
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
}

#scene {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  display: block;
}

#hud {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  padding: env(safe-area-inset-top, 12px) 14px 10px;
  z-index: 10;
  pointer-events: none;
}

.hud-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  background: var(--panel);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 10px 14px;
  border-radius: 14px;
  font-size: 14px;
  letter-spacing: 0.02em;
  pointer-events: auto;
}

.hud-left {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

#score {
  font-weight: 700;
  font-size: 16px;
  color: var(--accent-2);
}

.difficulty-btn {
  appearance: none;
  border: 0;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 6px 11px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.05s ease;
}

.difficulty-btn:hover {
  background: rgba(255, 255, 255, 0.14);
}

.difficulty-btn:active {
  transform: scale(0.96);
}

.difficulty-btn.lvl-easy {
  background: rgba(106, 218, 153, 0.30);
}

.difficulty-btn.lvl-medium {
  background: rgba(255, 209, 102, 0.28);
}

.difficulty-btn.lvl-hard {
  background: rgba(89, 194, 255, 0.25);
}

.difficulty-btn.lvl-impossible {
  background: rgba(255, 85, 119, 0.34);
}

#status {
  opacity: 0.85;
  text-align: right;
}

.controls {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 14px 16px calc(env(safe-area-inset-bottom, 16px) + 14px);
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 18px;
  z-index: 10;
  pointer-events: none;
}

.controls > * {
  pointer-events: auto;
}

.dpad {
  position: relative;
  width: 168px;
  height: 168px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 6px;
}

.dir {
  appearance: none;
  border: 0;
  background: var(--panel);
  color: var(--text);
  font-size: 22px;
  border-radius: 14px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.05s ease, background 0.15s ease;
}

.dir:active,
.dir.active {
  background: rgba(89, 194, 255, 0.35);
  transform: scale(0.96);
}

.dir.up {
  grid-column: 2;
  grid-row: 1;
}
.dir.left {
  grid-column: 1;
  grid-row: 2;
}
.dir.right {
  grid-column: 3;
  grid-row: 2;
}
.dir.down {
  grid-column: 2;
  grid-row: 3;
}

.drop {
  appearance: none;
  border: 0;
  background: linear-gradient(160deg, #ff5577, #c43760);
  color: white;
  font-weight: 800;
  font-size: 20px;
  letter-spacing: 0.12em;
  width: 110px;
  height: 110px;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(196, 55, 96, 0.4),
    inset 0 -4px 0 rgba(0, 0, 0, 0.18);
  transition: transform 0.05s ease, filter 0.15s ease;
}

.drop:active {
  transform: scale(0.95);
}

.drop:disabled {
  filter: grayscale(0.5) brightness(0.6);
  cursor: not-allowed;
}

.reset {
  position: absolute;
  top: -56px;
  right: 0;
  appearance: none;
  border: 0;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--panel);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--text);
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
  transition: transform 0.05s ease, background 0.15s ease;
}

.reset:active {
  transform: scale(0.94);
  background: rgba(89, 194, 255, 0.35);
}

@media (max-width: 380px) {
  .dpad {
    width: 144px;
    height: 144px;
  }
  .drop {
    width: 96px;
    height: 96px;
    font-size: 18px;
  }
  .hud-row {
    font-size: 12px;
  }
  #score {
    font-size: 14px;
  }
}

@media (orientation: landscape) and (max-height: 480px) {
  .dpad {
    width: 140px;
    height: 140px;
  }
  .drop {
    width: 96px;
    height: 96px;
  }
}