:root {
  color-scheme: dark;
  --bg: #15151a;
  --panel: rgba(28, 29, 36, 0.78);
  --panel-strong: rgba(31, 33, 43, 0.92);
  --text: #f6f3ea;
  --muted: #a9a7af;
  --line: rgba(255, 255, 255, 0.14);
  --teal: #5de0c6;
  --coral: #ff6b6b;
  --gold: #ffd166;
  --violet: #8f7aff;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.42);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
}

body {
  min-height: 100dvh;
  margin: 0;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(93, 224, 198, 0.12), transparent 34%),
    linear-gradient(315deg, rgba(255, 107, 107, 0.12), transparent 38%),
    #15151a;
  color: var(--text);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Microsoft YaHei", sans-serif;
  letter-spacing: 0;
}

button {
  font: inherit;
}

.app-shell {
  width: min(1120px, 100%);
  min-height: 100dvh;
  margin: 0 auto;
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 14px;
  padding: max(14px, env(safe-area-inset-top)) max(14px, env(safe-area-inset-right))
    max(14px, env(safe-area-inset-bottom)) max(14px, env(safe-area-inset-left));
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.brand {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--gold);
  font-size: 1.25rem;
  box-shadow: inset 0 0 22px rgba(255, 209, 102, 0.15);
}

.brand h1 {
  margin: 0;
  font-size: clamp(1.15rem, 2.8vw, 1.65rem);
  line-height: 1.1;
  letter-spacing: 0;
}

.brand p {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.scoreboard {
  display: grid;
  grid-template-columns: repeat(2, minmax(74px, 106px));
  gap: 8px;
}

.score-tile {
  min-height: 56px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.07);
  display: grid;
  align-content: center;
  gap: 2px;
  text-align: right;
}

.score-tile span {
  color: var(--muted);
  font-size: 0.74rem;
}

.score-tile strong {
  color: var(--text);
  font-size: clamp(1.1rem, 3.8vw, 1.55rem);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.score-tile.accent strong {
  color: var(--gold);
}

.game-frame {
  position: relative;
  min-height: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: #101116;
  box-shadow: var(--shadow);
  isolation: isolate;
}

#gameCanvas {
  width: 100%;
  height: 100%;
  min-height: 460px;
  display: block;
  cursor: crosshair;
  touch-action: none;
  user-select: none;
}

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

.combo-badge {
  position: absolute;
  top: 18%;
  left: 50%;
  min-width: 56px;
  transform: translate(-50%, 12px) scale(0.88);
  opacity: 0;
  padding: 7px 12px;
  border: 1px solid rgba(255, 209, 102, 0.6);
  border-radius: 999px;
  background: rgba(20, 21, 26, 0.68);
  color: var(--gold);
  font-weight: 800;
  text-align: center;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.25);
}

.combo-badge.show {
  animation: score-pop 720ms ease forwards;
}

.screen {
  position: absolute;
  inset: 0;
  z-index: 3;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(12, 13, 17, 0.5);
  backdrop-filter: blur(8px);
}

.screen[hidden] {
  display: none;
}

.screen-panel {
  width: min(420px, 100%);
  padding: clamp(24px, 6vw, 38px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-strong);
  box-shadow: var(--shadow);
  text-align: center;
}

.screen-kicker {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 28px;
  padding: 0 12px;
  border: 1px solid rgba(93, 224, 198, 0.45);
  border-radius: 999px;
  color: var(--teal);
  font-size: 0.76rem;
  font-weight: 800;
}

.screen-kicker.danger {
  border-color: rgba(255, 107, 107, 0.55);
  color: var(--coral);
}

.screen-panel h2 {
  margin: 14px 0 8px;
  font-size: clamp(2rem, 8vw, 3.25rem);
  line-height: 1;
  letter-spacing: 0;
}

.screen-panel p {
  margin: 0 auto 22px;
  color: var(--muted);
  line-height: 1.7;
}

.screen-panel strong {
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.divider-dot::before {
  content: "";
  width: 5px;
  height: 5px;
  margin: 0 8px 2px;
  display: inline-block;
  border-radius: 50%;
  background: var(--line);
  vertical-align: middle;
}

.primary-button {
  width: min(260px, 100%);
  min-height: 52px;
  border: 0;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--teal), #8ff0a4 52%, var(--gold));
  color: #14151a;
  font-size: 1rem;
  font-weight: 850;
  cursor: pointer;
  box-shadow: 0 16px 38px rgba(93, 224, 198, 0.2);
  transition:
    transform 160ms ease,
    filter 160ms ease,
    box-shadow 160ms ease;
}

.primary-button:hover,
.primary-button:focus-visible {
  transform: translateY(-1px);
  filter: saturate(1.08);
  outline: none;
  box-shadow: 0 18px 44px rgba(255, 209, 102, 0.2);
}

.primary-button:active {
  transform: translateY(1px);
}

.touch-controls {
  position: absolute;
  z-index: 2;
  right: 16px;
  bottom: 16px;
  display: flex;
  gap: 10px;
  pointer-events: auto;
}

.control-button {
  width: 54px;
  height: 54px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  background: rgba(28, 29, 36, 0.68);
  color: var(--text);
  font-size: 1.35rem;
  font-weight: 900;
  cursor: pointer;
  touch-action: none;
  backdrop-filter: blur(8px);
}

.control-button:active,
.control-button.is-held {
  background: rgba(93, 224, 198, 0.2);
  border-color: rgba(93, 224, 198, 0.72);
}

@keyframes score-pop {
  0% {
    opacity: 0;
    transform: translate(-50%, 14px) scale(0.88);
  }

  18% {
    opacity: 1;
    transform: translate(-50%, 0) scale(1);
  }

  100% {
    opacity: 0;
    transform: translate(-50%, -36px) scale(1.08);
  }
}

@media (max-width: 680px) {
  body {
    overflow: hidden;
  }

  .app-shell {
    gap: 10px;
    padding: max(10px, env(safe-area-inset-top)) max(10px, env(safe-area-inset-right))
      max(10px, env(safe-area-inset-bottom)) max(10px, env(safe-area-inset-left));
  }

  .topbar {
    align-items: stretch;
  }

  .brand {
    gap: 9px;
  }

  .brand-mark {
    width: 38px;
    height: 38px;
    flex-basis: 38px;
  }

  .brand p {
    display: none;
  }

  .scoreboard {
    grid-template-columns: repeat(2, minmax(64px, 1fr));
    flex: 0 0 min(48vw, 168px);
  }

  .score-tile {
    min-height: 46px;
    padding: 7px 8px;
  }

  .game-frame {
    min-height: 0;
  }

  #gameCanvas {
    min-height: calc(100dvh - 92px);
  }

  .screen-panel {
    padding: 24px 18px;
  }

  .touch-controls {
    right: 12px;
    bottom: 12px;
  }

  .control-button {
    width: 50px;
    height: 50px;
  }
}

@media (min-width: 681px) {
  .game-frame {
    height: min(74dvh, 720px);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}