:root {
  --bg-a: #1a1a2e;
  --bg-b: #16213e;
  --bg-c: #0f3460;
  --display-font:
    "Comic Sans MS",
    "Chalkboard SE",
    "Chalkboard",
    "Comic Neue",
    "Marker Felt",
    "Trebuchet MS",
    sans-serif;
  --panel: rgba(8, 16, 38, 0.78);
  --panel-border: rgba(159, 213, 255, 0.32);
  --text-main: #f8fbff;
  --text-soft: #bfd4f2;
  --pulse-a: #7de8ff;
  --pulse-b: #ff8fe0;
  --bubble-size: clamp(120px, 13vw, 186px);
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
}

body {
  font-family: var(--display-font);
  color: var(--text-main);
  background: linear-gradient(135deg, var(--bg-a) 0%, var(--bg-b) 52%, var(--bg-c) 100%);
}

.app-shell {
  position: relative;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

.arena {
  position: absolute;
  inset: 0;
  z-index: 1;
  overflow: hidden;
  background:
    radial-gradient(circle at 8% 20%, rgba(125, 232, 255, 0.16), transparent 42%),
    radial-gradient(circle at 92% 82%, rgba(255, 143, 224, 0.13), transparent 39%),
    linear-gradient(180deg, rgba(15, 26, 50, 0.35), rgba(6, 13, 29, 0.7));
}

.lane-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(125, 232, 255, 0.1), transparent 20%, transparent 78%, rgba(255, 143, 224, 0.13)),
    repeating-linear-gradient(
      0deg,
      rgba(233, 248, 255, 0.05) 0,
      rgba(233, 248, 255, 0.05) 1px,
      transparent 1px,
      transparent 38px
    );
}

.lane-overlay::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 0, rgba(126, 236, 255, 0.16) 44%, transparent 60%);
  animation: scan 2.5s linear infinite;
}

.hero {
  position: absolute;
  top: 14px;
  left: 14px;
  z-index: 20;
  max-width: min(60vw, 680px);
  padding: 10px 14px 12px;
  border-radius: 12px;
  border: 1px solid var(--panel-border);
  background: var(--panel);
  backdrop-filter: blur(6px);
  pointer-events: none;
}

.hero-code {
  margin: 0;
  font-family: "Courier New", "Menlo", monospace;
  color: var(--text-soft);
  letter-spacing: 0.12em;
  font-size: 0.8rem;
}

h1 {
  margin: 6px 0 2px;
  font-size: clamp(2rem, 5.5vw, 3.4rem);
  line-height: 0.94;
  letter-spacing: 0.06em;
  font-family: var(--display-font);
  text-shadow:
    0 0 14px rgba(125, 232, 255, 0.4),
    0 0 36px rgba(125, 232, 255, 0.3);
}

.hero-subtitle {
  margin: 0;
  color: var(--text-soft);
  font-size: clamp(0.95rem, 1.85vw, 1.14rem);
}

.hud {
  position: absolute;
  top: 126px;
  left: 14px;
  right: 14px;
  z-index: 20;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 112px));
  gap: 8px;
  justify-content: start;
}

.stat {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  padding: 7px 10px;
  display: grid;
  gap: 1px;
}

.stat-label {
  color: var(--text-soft);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.stat-value {
  font-size: clamp(1.12rem, 2.05vw, 1.45rem);
  font-weight: 700;
}

.target-key {
  align-self: start;
  justify-self: start;
  min-width: 38px;
  text-align: center;
  font-size: 1.05rem;
  font-family: "Courier New", "Menlo", monospace;
  color: #112242;
  background: linear-gradient(150deg, #f8fdff, #b6dfff);
  border: 1px solid #ddf0ff;
  border-radius: 7px;
  padding: 3px 9px;
}

.controls {
  position: absolute;
  top: 14px;
  right: 14px;
  z-index: 22;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.mode-picker {
  display: grid;
  gap: 3px;
  padding: 4px 8px 7px;
  border: 1px solid rgba(191, 227, 255, 0.45);
  border-radius: 9px;
  background:
    linear-gradient(145deg, rgba(17, 39, 82, 0.84), rgba(27, 67, 124, 0.76)),
    radial-gradient(circle at 15% 20%, rgba(125, 232, 255, 0.18), transparent 38%);
}

.mode-picker span {
  font-size: 0.63rem;
  line-height: 1;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #d9ecff;
}

.mode-picker select {
  appearance: none;
  border: 1px solid rgba(216, 239, 255, 0.55);
  border-radius: 7px;
  background: rgba(7, 16, 37, 0.78);
  color: #eff8ff;
  font: inherit;
  font-size: 0.86rem;
  font-weight: 700;
  padding: 6px 28px 6px 9px;
  min-width: 190px;
  cursor: pointer;
}

.controls button {
  appearance: none;
  border: 1px solid rgba(191, 227, 255, 0.45);
  border-radius: 9px;
  padding: 8px 12px;
  font: inherit;
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: #eff8ff;
  background:
    linear-gradient(145deg, rgba(17, 39, 82, 0.84), rgba(27, 67, 124, 0.76)),
    radial-gradient(circle at 15% 20%, rgba(125, 232, 255, 0.18), transparent 38%);
  cursor: pointer;
  transition: transform 120ms ease, box-shadow 120ms ease;
}

.controls button:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.26);
}

.controls button:active {
  transform: translateY(0);
}

.bubble {
  position: absolute;
  left: -9999px;
  top: -9999px;
  width: var(--bubble-size);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  display: grid;
  place-items: center;
  transform: translate(-50%, -50%);
  color: #ffffff;
  font-size: clamp(2.8rem, 7.8vw, 5.8rem);
  font-weight: 800;
  font-family: var(--display-font);
  text-shadow:
    0 0 12px rgba(255, 255, 255, 0.75),
    0 0 30px rgba(125, 232, 255, 0.65),
    0 0 52px rgba(255, 143, 224, 0.4);
  background:
    radial-gradient(circle at 32% 25%, rgba(255, 255, 255, 0.97), rgba(255, 255, 255, 0.48) 32%, transparent 46%),
    radial-gradient(circle at 70% 74%, #77d8ff 0%, #7584ff 52%, #a46dff 78%, #4f2d7a 100%);
  border: 2px solid rgba(245, 250, 255, 0.7);
  box-shadow:
    0 0 0 3px rgba(17, 30, 60, 0.34) inset,
    0 16px 25px rgba(0, 0, 0, 0.35),
    0 0 46px rgba(125, 232, 255, 0.5);
}

.bubble.hidden {
  display: none;
}

.bubble-ghost {
  pointer-events: none;
  animation: bubble-pop 380ms ease-out forwards;
}

.effect-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.confetti-piece {
  position: absolute;
  left: -9999px;
  top: -9999px;
  width: var(--w, 8px);
  height: var(--h, 12px);
  border-radius: 2px;
  transform: translate(-50%, -50%);
  animation: confetti 920ms cubic-bezier(0.08, 0.56, 0.19, 1) forwards;
}

.status-panel {
  position: absolute;
  right: 14px;
  bottom: 14px;
  z-index: 20;
  width: min(420px, calc(100% - 28px));
  padding: 7px 9px;
  border-radius: 9px;
  background: rgba(6, 14, 31, 0.8);
  border: 1px solid rgba(170, 218, 255, 0.25);
}

.status-line {
  margin: 0;
  font-size: clamp(0.72rem, 1.4vw, 0.88rem);
  line-height: 1.3;
  color: #ebf5ff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tip-line {
  display: none;
}

.arena.wrong {
  animation: wrong-flash 190ms ease-out;
}

@keyframes scan {
  0% {
    transform: translateX(-135%);
  }
  100% {
    transform: translateX(135%);
  }
}

@keyframes bubble-pop {
  0% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
    filter: saturate(1);
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(1.62);
    filter: blur(4px) saturate(2.1);
  }
}

@keyframes confetti {
  0% {
    opacity: 1;
    transform: translate(-50%, -50%) rotate(0deg);
  }
  100% {
    opacity: 0;
    transform: translate(calc(-50% + var(--dx, 0px)), calc(-50% + var(--dy, 0px))) rotate(var(--dr, 0deg));
  }
}

@keyframes wrong-flash {
  0% {
    box-shadow: inset 0 0 0 0 rgba(255, 90, 90, 0);
  }
  100% {
    box-shadow: inset 0 0 0 6px rgba(255, 90, 90, 0.42);
  }
}

@media (max-width: 1040px) {
  .hero {
    max-width: calc(100vw - 210px);
  }

  .hud {
    grid-template-columns: repeat(3, minmax(0, 112px));
    top: 138px;
  }
}

@media (max-width: 740px) {
  .hero {
    left: 10px;
    right: 10px;
    max-width: none;
    padding-right: 112px;
  }

  .controls {
    top: 68px;
    right: 10px;
    flex-direction: column;
    align-items: stretch;
  }

  .mode-picker select {
    min-width: 0;
    width: 100%;
  }

  .controls button {
    width: 96px;
  }

  .hud {
    top: 172px;
    left: 10px;
    right: 10px;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .status-panel {
    right: 10px;
    width: min(320px, calc(100% - 20px));
    bottom: 10px;
  }
}

@media (max-width: 540px) {
  .hero {
    top: 8px;
    left: 8px;
    right: 8px;
    padding-right: 8px;
  }

  .controls {
    top: auto;
    right: auto;
    left: 8px;
    bottom: 86px;
    flex-direction: row;
    width: calc(100% - 16px);
    justify-content: center;
  }

  .mode-picker {
    width: auto;
    max-width: 44vw;
  }

  .mode-picker select {
    min-width: 0;
    width: 100%;
  }

  .controls button {
    width: auto;
    min-width: 90px;
  }

  .hud {
    top: 178px;
    left: 8px;
    right: 8px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px;
  }

  .stat {
    padding: 6px 8px;
  }

  .status-panel {
    right: 8px;
    left: 8px;
    width: auto;
    bottom: 8px;
  }
}