:root {
  --font-display: "Iowan Old Style", Palatino, "Palatino Linotype", "Times New Roman", serif;
  --font-ui: "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-num: "Segoe UI", ui-sans-serif, system-ui, sans-serif;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --stage-w: min(440px, 92vw);
  --pad: clamp(16px, 3vw, 32px);
}

html[data-theme="light"] {
  --bg: #f3efe6;
  --bg-deep: #fffdf8;
  --fg: #14110e;
  --muted: #7a7368;
  --line: rgba(20, 17, 14, 0.16);
  --glow: rgba(255, 255, 255, 0.95);
  --glow-2: rgba(20, 17, 14, 0.08);
  --fill: #14110e;
  --fill-inv: #f3efe6;
  --shadow: 0 24px 60px rgba(20, 17, 14, 0.08);
  --receptor: rgba(20, 17, 14, 0.12);
  --note: #14110e;
  --scan: transparent;
  --letter: 0.38em;
  --weight: 400;
  --ui-tracking: 0.22em;
  --radius: 2px;
  --vignette: radial-gradient(ellipse at 50% 28%, rgba(255, 255, 255, 0.9) 0%, rgba(243, 239, 230, 0) 52%);
  color-scheme: light;
}

html[data-theme="dark"] {
  --bg: #050505;
  --bg-deep: #000;
  --fg: #f4f1ea;
  --muted: #8a8680;
  --line: rgba(244, 241, 234, 0.16);
  --glow: rgba(255, 255, 255, 0.22);
  --glow-2: rgba(255, 255, 255, 0.06);
  --fill: #f4f1ea;
  --fill-inv: #050505;
  --shadow: 0 0 40px rgba(255, 255, 255, 0.06);
  --receptor: rgba(244, 241, 234, 0.14);
  --note: #f4f1ea;
  --scan: repeating-linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.03) 0 1px,
    transparent 1px 4px
  );
  --letter: 0.18em;
  --weight: 700;
  --ui-tracking: 0.14em;
  --radius: 0;
  --vignette: radial-gradient(ellipse at 50% 0%, rgba(255, 255, 255, 0.08), transparent 42%),
    radial-gradient(ellipse at 50% 110%, #000 0%, transparent 50%);
  color-scheme: dark;
}

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

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-ui);
}

body {
  min-height: 100dvh;
  overflow-x: hidden;
  user-select: none;
  -webkit-user-select: none;
}

button,
input {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
}

h1,
h2 {
  font-family: var(--font-display);
  font-weight: var(--weight);
  letter-spacing: var(--letter);
  text-transform: uppercase;
  margin: 0;
}

h1 {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
}

h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  margin: 0.2rem 0 1rem;
}

kbd {
  display: inline-block;
  min-width: 1.4em;
  padding: 0.1em 0.35em;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--font-num);
  font-size: 0.85em;
}

.atmosphere {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.haze {
  position: absolute;
  inset: 0;
  background: var(--vignette);
}

.grain {
  position: absolute;
  inset: -20%;
  opacity: 0.08;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='80' height='80'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  mix-blend-mode: overlay;
}

html[data-theme="light"] .grain {
  opacity: 0.12;
  mix-blend-mode: multiply;
}

html[data-theme="dark"] .grain {
  opacity: 0.18;
}

.atmosphere::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--scan);
  pointer-events: none;
}

.sigil {
  position: absolute;
  left: 50%;
  top: 18%;
  width: min(280px, 50vw);
  height: min(280px, 50vw);
  transform: translate(-50%, -30%);
  opacity: 0.18;
}

html[data-theme="light"] .sigil {
  background:
    radial-gradient(circle, transparent 42%, var(--fg) 43%, var(--fg) 44%, transparent 45%),
    linear-gradient(var(--fg), var(--fg)) center 18% / 2px 64% no-repeat,
    linear-gradient(var(--fg), var(--fg)) center 38% / 38% 2px no-repeat;
  filter: blur(0.2px);
  opacity: 0.07;
  top: 8%;
}

html[data-theme="dark"] .sigil {
  background:
    linear-gradient(var(--fg), var(--fg)) center 8% / 3px 78% no-repeat,
    linear-gradient(var(--fg), var(--fg)) center 28% / 42% 3px no-repeat,
    linear-gradient(var(--fg), var(--fg)) 50% 86% / 18% 3px no-repeat;
  opacity: 0.2;
  filter: drop-shadow(0 0 12px var(--glow));
}

.topbar,
main,
.dev-hint,
.debug {
  position: relative;
  z-index: 1;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--pad);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.brand-mark {
  width: 14px;
  height: 22px;
  position: relative;
}

.brand-mark::before,
.brand-mark::after {
  content: "";
  position: absolute;
  background: var(--fg);
}

.brand-mark::before {
  left: 6px;
  top: 0;
  width: 2px;
  height: 22px;
}

.brand-mark::after {
  left: 0;
  top: 7px;
  width: 14px;
  height: 2px;
}

html[data-theme="dark"] .brand-mark::before {
  height: 22px;
}

html[data-theme="dark"] .brand-mark::after {
  top: 6px;
  box-shadow: 0 12px 0 0 var(--fg);
  width: 10px;
  left: 2px;
}

.ghost,
.solid {
  border: 1px solid var(--fg);
  padding: 0.7rem 1.2rem;
  letter-spacing: var(--ui-tracking);
  text-transform: uppercase;
  font-size: 0.72rem;
  background: transparent;
  transition: background 160ms var(--ease), color 160ms var(--ease), box-shadow 160ms var(--ease);
  border-radius: var(--radius);
}

.ghost:hover,
.solid:hover {
  box-shadow: var(--shadow);
}

.solid {
  background: var(--fg);
  color: var(--fill-inv);
}

html[data-theme="light"] .solid {
  box-shadow: 0 0 24px rgba(255, 255, 255, 0.8);
}

html[data-theme="dark"] .solid {
  box-shadow: 0 0 18px rgba(255, 255, 255, 0.18);
}

#themeToggle {
  min-width: 7.5rem;
}

html[data-theme="light"] .theme-demon,
html[data-theme="dark"] .theme-angel {
  display: none;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 var(--pad) 4rem;
}

.screen {
  animation: rise 420ms var(--ease);
}

.screen[hidden] {
  display: none !important;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.kicker {
  text-transform: uppercase;
  letter-spacing: var(--ui-tracking);
  font-size: 0.72rem;
  color: var(--muted);
  margin: 0 0 0.8rem;
}

.lede {
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2.6vw, 1.7rem);
  line-height: 1.35;
  max-width: 28ch;
  margin: 0 0 1.6rem;
}

html[data-theme="light"] .lede {
  font-weight: 400;
}

html[data-theme="dark"] .lede {
  font-weight: 600;
  letter-spacing: 0.02em;
}

.drop {
  display: grid;
  place-items: center;
  gap: 0.35rem;
  min-height: 180px;
  padding: 1.5rem;
  border: 1px dashed var(--fg);
  border-radius: var(--radius);
  text-align: center;
  cursor: pointer;
  background: color-mix(in srgb, var(--bg-deep) 70%, transparent);
  position: relative;
  overflow: hidden;
}

.drop input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.drop strong {
  letter-spacing: var(--ui-tracking);
  text-transform: uppercase;
  font-size: 0.82rem;
}

.drop em {
  font-style: normal;
  color: var(--muted);
  font-size: 0.78rem;
}

.drop.drag {
  background: var(--fg);
  color: var(--fill-inv);
}

.drop-ornament {
  width: 42px;
  height: 42px;
  margin-bottom: 0.4rem;
  opacity: 0.7;
}

html[data-theme="light"] .drop-ornament {
  background:
    radial-gradient(circle, transparent 55%, var(--fg) 56%, var(--fg) 58%, transparent 59%),
    linear-gradient(var(--fg), var(--fg)) center / 1px 70% no-repeat,
    linear-gradient(var(--fg), var(--fg)) center 40% / 40% 1px no-repeat;
}

html[data-theme="dark"] .drop-ornament {
  background:
    linear-gradient(var(--fg), var(--fg)) center / 2px 78% no-repeat,
    linear-gradient(var(--fg), var(--fg)) center 32% / 50% 2px no-repeat,
    linear-gradient(var(--fg), var(--fg)) 50% 84% / 22% 2px no-repeat;
}

.menu-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  align-items: center;
  margin-top: 1.2rem;
}

.fine {
  color: var(--muted);
  font-size: 0.8rem;
  max-width: 36ch;
  margin: 0;
}

.meter {
  height: 2px;
  background: var(--line);
  margin: 1.4rem 0 0.8rem;
}

.meter span {
  display: block;
  height: 100%;
  width: 0%;
  background: var(--fg);
  box-shadow: 0 0 12px var(--glow);
}

.meter.busy span {
  width: 28% !important;
  animation: meter-slide 1.15s var(--ease) infinite;
}

@keyframes meter-slide {
  0% {
    transform: translateX(-20%);
    opacity: 0.45;
  }
  50% {
    transform: translateX(240%);
    opacity: 1;
  }
  100% {
    transform: translateX(-20%);
    opacity: 0.45;
  }
}

.stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.6rem 1.2rem;
  margin: 0 0 1.2rem;
}

.stats div {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  border-top: 1px solid var(--line);
  padding-top: 0.45rem;
}

.stats dt {
  font-size: 0.68rem;
  letter-spacing: var(--ui-tracking);
  text-transform: uppercase;
  color: var(--muted);
}

.stats dd {
  margin: 0;
  font-variant-numeric: tabular-nums;
  font-size: 1.05rem;
}

.stats,
.lede,
h2 {
  position: relative;
  z-index: 1;
}

.density {
  border: 1px solid var(--line);
  padding: 0.8rem 1rem;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  border-radius: var(--radius);
}

.density legend {
  letter-spacing: var(--ui-tracking);
  text-transform: uppercase;
  font-size: 0.68rem;
  padding: 0 0.4rem;
}

.keys-hint,
.play-hint,
.dev-hint {
  color: var(--muted);
  font-size: 0.8rem;
}

.play {
  max-width: none;
}

.hud {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  max-width: var(--stage-w);
  margin: 0 auto 0.4rem;
  font-variant-numeric: tabular-nums;
}

.hud-cell {
  display: flex;
  flex-direction: column;
}

.hud-center {
  text-align: center;
}

.hud-right {
  text-align: right;
}

.hud-label {
  font-size: 0.62rem;
  letter-spacing: var(--ui-tracking);
  text-transform: uppercase;
  color: var(--muted);
}

#hudScore,
#hudAcc,
#hudCombo {
  font-size: 1.15rem;
  font-family: var(--font-num);
}

.stage {
  position: relative;
  width: var(--stage-w);
  margin: 0 auto;
  aspect-ratio: 4 / 6.2;
  max-height: min(74dvh, 820px);
}

#playfield {
  width: 100%;
  height: 100%;
  display: block;
  background: color-mix(in srgb, var(--bg-deep) 82%, transparent);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

html[data-theme="light"] #playfield {
  box-shadow: 0 0 80px rgba(255, 255, 255, 0.7), var(--shadow);
}

html[data-theme="dark"] #playfield {
  box-shadow: 0 0 48px rgba(255, 255, 255, 0.05), inset 0 0 80px rgba(0, 0, 0, 0.45);
}

.receptors-hit {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 7.5%;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 0 3.2%;
  gap: 0.4%;
  pointer-events: none;
}

.receptors-hit button {
  pointer-events: auto;
  height: 52px;
  border: 0;
  background: transparent;
  color: transparent;
  font-size: 0;
  touch-action: none;
}

.combo-burst,
.judge {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  pointer-events: none;
  text-align: center;
  letter-spacing: var(--letter);
  text-transform: uppercase;
}

.combo-burst {
  top: 28%;
  font-size: clamp(2rem, 6vw, 3.4rem);
  font-family: var(--font-display);
  font-weight: var(--weight);
  opacity: 0;
}

.judge {
  top: 42%;
  font-size: 0.85rem;
  opacity: 0;
}

.combo-burst.show,
.judge.show {
  animation: pop 520ms var(--ease);
}

@keyframes pop {
  0% {
    opacity: 0;
    transform: translateX(-50%) translateY(8px) scale(0.96);
  }
  18% {
    opacity: 1;
    transform: translateX(-50%) translateY(0) scale(1);
  }
  100% {
    opacity: 0;
  }
}

.overlay {
  position: fixed;
  inset: 0;
  display: grid;
  place-content: center;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(8px);
  z-index: 5;
  text-align: center;
}

.grade {
  font-family: var(--font-display);
  font-size: clamp(4rem, 14vw, 8rem);
  letter-spacing: var(--letter);
  line-height: 0.9;
  margin: 0.2rem 0;
  text-shadow: 0 0 28px var(--glow);
}

.dev-hint {
  position: fixed;
  left: var(--pad);
  bottom: var(--pad);
  margin: 0;
  z-index: 2;
}

.debug {
  position: fixed;
  right: var(--pad);
  bottom: var(--pad);
  width: min(420px, calc(100vw - 2 * var(--pad)));
  max-height: min(72dvh, 640px);
  overflow: auto;
  background: var(--bg-deep);
  border: 1px solid var(--fg);
  padding: 0.9rem;
  z-index: 8;
  box-shadow: var(--shadow);
}

.debug header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.6rem;
}

.debug h2 {
  font-size: 0.95rem;
  margin: 0;
}

.debug-grid {
  display: grid;
  gap: 0.45rem;
  font-size: 0.78rem;
}

.debug-grid label {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.35rem 0.6rem;
  align-items: center;
}

.debug-grid label.check {
  grid-template-columns: auto 1fr;
}

.debug-grid input[type="range"] {
  grid-column: 1 / -1;
  width: 100%;
  accent-color: var(--fg);
}

#debugInfo {
  font-size: 0.7rem;
  line-height: 1.4;
  white-space: pre-wrap;
  color: var(--muted);
  margin: 0.7rem 0 0.4rem;
}

#debugWave {
  width: 100%;
  height: 72px;
  border: 1px solid var(--line);
}

html[data-theme="dark"] body {
  font-synthesis: none;
}

html[data-theme="light"] h1,
html[data-theme="light"] h2,
html[data-theme="light"] .lede {
  text-shadow: 0 0 24px rgba(255, 255, 255, 0.9);
}

@media (max-width: 640px) {
  .dev-hint {
    display: none;
  }
  .stats {
    grid-template-columns: 1fr 1fr;
  }
}