:root {
  --bg: #07021a;
  --text: #f6efff;
  --muted: rgba(246, 239, 255, 0.66);
  --pink: #ff2bd6;
  --cyan: #21e6ff;
  --amber: #ffb547;
  --glass: rgba(255, 255, 255, 0.07);
  --glass-strong: rgba(255, 255, 255, 0.12);
  --stroke: rgba(255, 255, 255, 0.16);
  --radius: 18px;
  --font-display: 'Chakra Petch', 'Inter', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  color-scheme: dark;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  overscroll-behavior: none;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
}

#app {
  position: fixed;
  inset: 0;
  overflow: hidden;
}

#scene,
#touch-surface,
#vignette,
#flash {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

#scene {
  display: block;
}

#touch-surface {
  touch-action: none;
  z-index: 1;
}

#vignette {
  pointer-events: none;
  background: radial-gradient(ellipse at 50% 55%, transparent 55%, rgba(4, 0, 16, 0.65) 100%);
}

#flash {
  pointer-events: none;
  z-index: 6;
  opacity: 0;
  background: radial-gradient(circle at 50% 70%, #fff 0%, #ff7be6 45%, rgba(255, 43, 214, 0) 80%);
}

#flash.is-playing {
  animation: flash 0.6s var(--ease-out);
}

@keyframes flash {
  0% { opacity: 0.85; }
  100% { opacity: 0; }
}

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
  touch-action: manipulation;
}

button:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

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

.hud {
  position: absolute;
  inset: 0 0 auto 0;
  z-index: 3;
  display: flex;
  justify-content: center;
  padding: calc(var(--safe-top) + 14px) calc(var(--safe-right) + 16px) 0 calc(var(--safe-left) + 16px);
  pointer-events: none;
  opacity: 0;
  transform: translateY(-12px);
  transition: opacity 0.3s ease, transform 0.4s var(--ease-out);
}

.hud.is-visible {
  opacity: 1;
  transform: none;
}

.hud__score {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.hud__value {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(34px, 10vw, 52px);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  text-shadow: 0 0 18px rgba(33, 230, 255, 0.55), 0 2px 0 rgba(0, 0, 0, 0.35);
}

.hud__combo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  padding: 2px 10px;
  border-radius: 999px;
  color: #06121a;
  background: linear-gradient(90deg, var(--cyan), #9dffef);
  box-shadow: 0 0 16px rgba(33, 230, 255, 0.6);
  opacity: 0;
  transform: scale(0.6);
  transition: opacity 0.2s ease, transform 0.25s var(--ease-out);
}

.hud__combo.is-visible {
  opacity: 1;
  transform: none;
}

.hud__combo.bump {
  animation: bump 0.28s var(--ease-out);
}

@keyframes bump {
  0% { transform: scale(1.35); }
  100% { transform: scale(1); }
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  border: 1px solid var(--stroke);
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.icon-btn svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
}

.hud__pause {
  position: absolute;
  top: calc(var(--safe-top) + 12px);
  right: calc(var(--safe-right) + 14px);
}

.hud.is-visible .hud__pause {
  pointer-events: auto;
}

/* ---------------------------------------------------------------- popups & tutorial */

.popups {
  position: absolute;
  inset: 0;
  z-index: 3;
  pointer-events: none;
}

.popup {
  position: absolute;
  left: 50%;
  top: 38%;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 6vw, 30px);
  letter-spacing: 0.06em;
  white-space: nowrap;
  opacity: 0;
  transform: translate(-50%, 0);
}

.popup[data-variant='near'] {
  color: var(--amber);
  text-shadow: 0 0 18px rgba(255, 181, 71, 0.7);
}

.popup[data-variant='combo'] {
  color: var(--cyan);
  text-shadow: 0 0 18px rgba(33, 230, 255, 0.8);
}

.popup.is-playing {
  animation: popup 0.9s var(--ease-out) forwards;
}

@keyframes popup {
  0% { opacity: 0; transform: translate(-50%, 16px) scale(0.7); }
  18% { opacity: 1; transform: translate(-50%, 0) scale(1.08); }
  70% { opacity: 1; transform: translate(-50%, -18px) scale(1); }
  100% { opacity: 0; transform: translate(-50%, -34px) scale(0.96); }
}

.tutorial {
  position: absolute;
  left: 50%;
  bottom: calc(var(--safe-bottom) + 12%);
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  transform: translateX(-50%);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.4s ease;
}

.tutorial.is-visible {
  opacity: 1;
}

.tutorial p {
  margin: 0;
  white-space: nowrap;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 14px;
  color: var(--muted);
}

.tutorial__track {
  position: relative;
  width: 180px;
  height: 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.14);
}

.tutorial__thumb {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 34px;
  height: 34px;
  margin: -17px 0 0 -17px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.9);
  background: rgba(33, 230, 255, 0.35);
  box-shadow: 0 0 20px rgba(33, 230, 255, 0.7);
  animation: swipe 1.6s ease-in-out infinite;
}

@keyframes swipe {
  0%, 100% { transform: translateX(-70px); }
  50% { transform: translateX(70px); }
}

/* ---------------------------------------------------------------- screens */

.screen {
  position: absolute;
  inset: 0;
  z-index: 4;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 22px;
  padding: calc(var(--safe-top) + 24px) calc(var(--safe-right) + 20px) calc(var(--safe-bottom) + 24px) calc(var(--safe-left) + 20px);
  background: radial-gradient(ellipse at 50% 40%, rgba(7, 2, 26, 0.2), rgba(7, 2, 26, 0.72));
  opacity: 0;
  visibility: hidden;
  transform: scale(1.03);
  transition: opacity 0.35s ease, transform 0.45s var(--ease-out), visibility 0s linear 0.35s;
  overflow-y: auto;
  touch-action: pan-y;
}

.screen.is-visible {
  opacity: 1;
  visibility: visible;
  transform: none;
  transition: opacity 0.35s ease, transform 0.45s var(--ease-out), visibility 0s;
}

.screen--menu {
  justify-content: space-between;
  background: linear-gradient(180deg, rgba(7, 2, 26, 0.55) 0%, rgba(7, 2, 26, 0) 38%, rgba(7, 2, 26, 0) 55%, rgba(7, 2, 26, 0.8) 100%);
}

#screen-pause,
#screen-over {
  backdrop-filter: blur(10px) saturate(1.2);
  -webkit-backdrop-filter: blur(10px) saturate(1.2);
}

.brand {
  margin-top: 4vh;
  text-align: center;
}

.brand__kicker,
.screen__kicker {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--cyan);
}

.brand__title {
  margin: 0;
  display: flex;
  flex-direction: column;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(56px, 19vw, 104px);
  line-height: 0.88;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  background: linear-gradient(180deg, #ffffff 0%, #ffd1f5 45%, var(--pink) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 18px rgba(255, 43, 214, 0.55));
}

.brand__title span {
  background: linear-gradient(180deg, #ffffff 0%, #b8f7ff 45%, var(--cyan) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  filter: drop-shadow(0 0 18px rgba(33, 230, 255, 0.45));
}

.brand__tagline {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 15px;
  letter-spacing: 0.08em;
}

.panel {
  width: min(100%, 360px);
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 12px;
}

.panel--row {
  flex-direction: row;
}

.panel--row .btn {
  flex: 1;
}

.best {
  margin: 0;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.best strong {
  margin-left: 6px;
  color: var(--text);
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}

.btn {
  min-height: 54px;
  padding: 0 24px;
  border-radius: var(--radius);
  border: 1px solid var(--stroke);
  background: var(--glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transition: transform 0.15s var(--ease-out), background 0.2s ease, box-shadow 0.2s ease;
}

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

@media (hover: hover) {
  .btn:hover {
    background: var(--glass-strong);
  }
}

.btn--primary {
  min-height: 62px;
  border: none;
  color: #fff;
  background: linear-gradient(100deg, var(--pink) 0%, #9b3bff 55%, var(--cyan) 130%);
  box-shadow: 0 10px 30px rgba(255, 43, 214, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.35);
  font-size: 22px;
}

.btn--primary:not(:active) {
  animation: breathe 2.4s ease-in-out infinite;
}

@keyframes breathe {
  0%, 100% { box-shadow: 0 10px 30px rgba(255, 43, 214, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.35); }
  50% { box-shadow: 0 10px 42px rgba(255, 43, 214, 0.6), inset 0 1px 0 rgba(255, 255, 255, 0.35); }
}

@media (hover: hover) {
  .btn--primary:hover {
    background: linear-gradient(100deg, #ff4fe0 0%, #a852ff 55%, var(--cyan) 130%);
  }
}

.btn--ghost {
  background: transparent;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

.howto {
  margin: 6px 0 0;
  padding: 14px 16px;
  list-style: none;
  display: grid;
  gap: 10px;
  border-radius: var(--radius);
  border: 1px solid var(--stroke);
  background: rgba(10, 4, 30, 0.45);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  font-size: 14px;
  color: var(--muted);
}

.howto li {
  display: flex;
  align-items: center;
  gap: 12px;
}

.howto__icon {
  flex: none;
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 9px;
  background: rgba(255, 43, 214, 0.16);
  color: var(--pink);
  font-weight: 700;
}

.howto__icon--shard {
  background: rgba(33, 230, 255, 0.16);
  color: var(--cyan);
}

.howto__icon--near {
  background: rgba(255, 181, 71, 0.16);
  color: var(--amber);
}

.settings {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}

.chip {
  min-height: 40px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--stroke);
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  font-size: 13px;
  color: var(--muted);
}

.chip[hidden] {
  display: none;
}

.chip__value {
  margin-left: 4px;
  color: var(--text);
  font-weight: 600;
}

.chip[aria-pressed='false'] .chip__value {
  color: rgba(246, 239, 255, 0.4);
}

.screen__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(40px, 12vw, 64px);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.over__score {
  margin: -8px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(64px, 22vw, 112px);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  text-shadow: 0 0 30px rgba(255, 43, 214, 0.6);
}

.over__record {
  margin: -8px 0 0;
  padding: 6px 14px;
  border-radius: 999px;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-size: 14px;
  color: #1b0a00;
  background: linear-gradient(90deg, #ffe45e, var(--amber));
  box-shadow: 0 0 24px rgba(255, 196, 71, 0.6);
  display: none;
}

.over__record.is-visible {
  display: block;
  animation: bump 0.5s var(--ease-out);
}

.stats {
  width: min(100%, 360px);
  margin: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.stats div {
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--stroke);
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.stats dt {
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.stats dd {
  margin: 4px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  font-variant-numeric: tabular-nums;
}

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

.overlay {
  position: absolute;
  inset: 0;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 24px;
  text-align: center;
  background: var(--bg);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s ease, visibility 0s linear 0.4s;
}

.overlay.is-visible {
  opacity: 1;
  visibility: visible;
  transition: opacity 0.4s ease, visibility 0s;
}

.overlay p {
  margin: 0;
  max-width: 320px;
  color: var(--muted);
}

.overlay__title {
  font-family: var(--font-display);
  font-size: 32px;
  color: var(--text) !important;
}

#context-lost {
  background: rgba(7, 2, 26, 0.85);
}

.spinner {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 3px solid rgba(255, 255, 255, 0.12);
  border-top-color: var(--pink);
  border-right-color: var(--cyan);
  animation: spin 0.9s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ---------------------------------------------------------------- responsive */

@media (max-height: 640px) {
  .howto {
    display: none;
  }
  .brand {
    margin-top: 0;
  }
}

@media (orientation: landscape) and (max-height: 500px) {
  .screen {
    gap: 12px;
  }
  .screen--menu {
    justify-content: center;
  }
  .brand__title {
    flex-direction: row;
    gap: 0.25em;
    font-size: clamp(40px, 11vh, 64px);
  }
  .over__score {
    font-size: 56px;
  }
  .tutorial {
    bottom: calc(var(--safe-bottom) + 12px);
  }
  .stats {
    grid-template-columns: repeat(4, 1fr);
    width: min(100%, 560px);
  }
}

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