:root {
  color-scheme: dark;
  --bg: #090d13;
  --surface-strong: #1b2633;
  --line: #34475a;
  --text: #f6fbff;
  --muted: #94a4b8;
  --accent: #2df27e;
  --accent-dark: #13b95b;
  --shadow: rgba(0, 0, 0, 0.42);
  --board-size: min(100%, 390px, calc((100dvh - 154px) / 2));
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  overflow: hidden;
}

body {
  margin: 0;
  display: grid;
  place-items: center;
  padding: 8px;
  background:
    radial-gradient(circle at top left, rgba(45, 242, 126, 0.16), transparent 30rem),
    radial-gradient(circle at bottom right, rgba(255, 214, 68, 0.12), transparent 28rem),
    var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "Noto Sans TC", system-ui, sans-serif;
}

button {
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--surface-strong);
  color: var(--text);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  box-shadow: inset 0 -2px 0 rgba(0, 0, 0, 0.28);
}

button:hover,
button:focus-visible {
  border-color: var(--accent);
  outline: none;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

.app-shell {
  width: min(100%, 760px);
}

.game-frame {
  border: 1px solid #2b3b4c;
  border-radius: 8px;
  padding: 8px;
  background: linear-gradient(180deg, rgba(27, 38, 51, 0.96), rgba(10, 15, 22, 0.97));
  box-shadow: 0 24px 60px var(--shadow);
}

.app-header {
  width: var(--board-size);
  margin: 0 auto 6px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 6px;
  min-height: 36px;
}

.title-block {
  min-width: 0;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(18px, 5.4vw, 30px);
  line-height: 1;
  white-space: nowrap;
  overflow: hidden;
}

.score-panel {
  min-width: 74px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 5px 8px;
  background: #090f16;
  display: inline-flex;
  align-items: baseline;
  justify-content: center;
  gap: 6px;
  white-space: nowrap;
}

.next-panel {
  width: 82px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 4px 6px;
  background: #090f16;
  display: grid;
  grid-template-columns: auto 32px;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.next-panel span {
  color: var(--muted);
  font-size: 11px;
  white-space: nowrap;
}

#next {
  display: block;
  width: 32px;
  height: 24px;
}

.score-panel span,
.overlay p {
  color: var(--muted);
}

.score-panel span {
  font-size: 11px;
}

.score-panel strong {
  display: inline;
  margin-top: 0;
  font-size: 22px;
  line-height: 1;
}

.top-actions {
  width: var(--board-size);
  margin: 0 auto 6px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
}

.top-actions button {
  min-height: 30px;
  padding: 5px 8px;
  font-size: 14px;
}

.play-stack {
  width: var(--board-size);
  margin: 0 auto;
  display: grid;
  gap: 6px;
}

.board-panel {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 2;
}

#board {
  display: block;
  width: 100%;
  height: 100%;
  border: 2px solid #405468;
  border-radius: 8px;
  background: #05080c;
}

.overlay {
  position: absolute;
  inset: 0;
  display: none;
  place-content: center;
  justify-items: center;
  gap: 12px;
  padding: 20px;
  border-radius: 8px;
  background: rgba(5, 8, 12, 0.9);
  text-align: center;
}

.effects-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  border-radius: 8px;
}

.score-burst {
  position: absolute;
  left: 50%;
  top: 48%;
  transform: translate(-50%, -50%) scale(0.84);
  color: #fff84d;
  font-size: clamp(34px, 11vw, 58px);
  font-weight: 1000;
  letter-spacing: 0.06em;
  text-align: center;
  text-shadow:
    0 0 4px #ffffff,
    0 0 12px #2df27e,
    0 0 24px #00e5ff,
    3px 3px 0 #ff2bd6,
    -3px -2px 0 #00e5ff;
  animation: scoreBurst 1080ms cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.score-burst::before {
  content: "";
  position: absolute;
  inset: -14px -20px;
  z-index: -1;
  background:
    linear-gradient(90deg, transparent, rgba(0, 229, 255, 0.55), transparent),
    linear-gradient(0deg, transparent, rgba(255, 43, 214, 0.48), transparent);
  transform: skewX(-14deg);
  filter: blur(1px);
}

@keyframes scoreBurst {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.72) skewX(-10deg);
    filter: blur(3px);
  }
  12% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.18) skewX(8deg);
    filter: blur(0);
  }
  38% {
    transform: translate(-50%, -58%) scale(1) skewX(-4deg);
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -90%) scale(0.86) skewX(0deg);
    filter: blur(1px);
  }
}

.overlay.is-visible {
  display: grid;
}

.overlay h2 {
  margin-bottom: 0;
  font-size: clamp(24px, 6vw, 32px);
}

.overlay p {
  max-width: 260px;
  margin-bottom: 0;
  line-height: 1.55;
}

.primary-button {
  min-width: 104px;
  min-height: 40px;
  padding: 8px 14px;
  border-color: transparent;
  background: linear-gradient(180deg, var(--accent), var(--accent-dark));
  color: #041108;
}

.touch-controls {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
  width: 100%;
}

.touch-controls button {
  min-height: 46px;
  padding: 6px;
  font-size: 23px;
  touch-action: manipulation;
}

@media (max-width: 430px) {
  :root {
    --board-size: min(calc(100vw - 16px), calc((100dvh - 144px) / 2));
  }

  body {
    align-items: start;
    padding: 6px;
  }

  .game-frame {
    padding: 6px;
  }

  .app-header {
    margin-bottom: 6px;
    gap: 5px;
  }

  .top-actions {
    margin-bottom: 6px;
  }

  .play-stack {
    gap: 6px;
  }
}

@media (max-width: 360px) {
  :root {
    --board-size: min(calc(100vw - 12px), calc((100dvh - 140px) / 2));
  }

  .score-panel {
    min-width: 62px;
    gap: 4px;
    padding-inline: 5px;
  }

  .score-panel strong {
    font-size: 20px;
  }

  .next-panel {
    width: 66px;
    height: 34px;
    grid-template-columns: auto 26px;
    gap: 3px;
    padding-inline: 4px;
  }

  .next-panel span {
    font-size: 10px;
  }

  #next {
    width: 26px;
    height: 22px;
  }

  .top-actions button {
    font-size: 13px;
  }

  .touch-controls button {
    min-height: 46px;
    font-size: 21px;
  }
}

@media (min-width: 760px) and (min-height: 900px) {
  :root {
    --board-size: min(410px, calc((100dvh - 154px) / 2));
  }
}

@media (min-width: 760px) and (max-height: 820px) {
  :root {
    --board-size: min(360px, calc((100dvh - 146px) / 2));
  }

  .touch-controls button {
    min-height: 42px;
  }
}