body {
  background-color: #000;
  margin: 0;
  overflow: hidden;
}

/**
 * Terrain controls (synthwave style)
 */
.controls {
  --green: #00ff41;

  position: fixed;
  right: 16px;
  bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 12px 14px;
  width: 170px;
  font: 10px/1 ui-monospace, Menlo, monospace;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--green);
  background: rgba(0, 20, 5, 0.35);
  border: 1px solid rgba(0, 255, 65, 0.25);
  box-shadow: 0 0 12px rgba(0, 255, 65, 0.15);
  opacity: 0.35;
  transition: opacity 0.3s;
}

.controls:hover {
  opacity: 1;
}

.controls label {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.controls span {
  display: flex;
  justify-content: space-between;
  text-shadow: 0 0 6px var(--green);
}

.controls input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 2px;
  margin: 0;
  background: rgba(0, 255, 65, 0.3);
  outline: none;
  cursor: pointer;
}

.controls input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 8px;
  height: 8px;
  background: var(--green);
  box-shadow: 0 0 8px var(--green);
}

.controls input[type="range"]::-moz-range-thumb {
  width: 8px;
  height: 8px;
  border: none;
  border-radius: 0;
  background: var(--green);
  box-shadow: 0 0 8px var(--green);
}

.source {
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin-top: 2px;
  border: 1px solid rgba(0, 255, 65, 0.5);
}

.source button {
  padding: 6px 0;
  font: inherit;
  letter-spacing: inherit;
  text-transform: inherit;
  color: rgba(0, 255, 65, 0.6);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.source button:hover {
  color: var(--green);
}

.source button[aria-pressed="true"] {
  color: #000;
  background: var(--green);
  box-shadow: 0 0 10px rgba(0, 255, 65, 0.5);
}

/**
 * Rhythm game HUD
 */
:root {
  --green: #00ff41;
  --lime: #e4ff4a;
  --pink: #ff2d95;
  --cyan: #00e5ff;
}

.controls {
  z-index: 15;
}

.hud {
  position: fixed;
  inset: 0;
  z-index: 10;
  pointer-events: none;
  font-family: 'Orbitron', sans-serif;
  text-transform: uppercase;
}

/* Combo: big chrome number at the top */
.combo {
  position: absolute;
  top: 6vh;
  left: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  transform: translateX(-50%);
  transform-origin: center top;
}

.combo[hidden] {
  display: none;
}

.combo-value {
  font-size: 14vmin;
  font-weight: 900;
  font-style: italic;
  line-height: 1;
  letter-spacing: 0.04em;
  background: linear-gradient(180deg, #ffffff 0%, var(--lime) 40%, var(--green) 52%, #0b7a2a 70%, var(--lime) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 10px rgba(0, 255, 65, 0.55)) drop-shadow(3px 3px 0 rgba(255, 45, 149, 0.55));
}

.combo-label {
  margin-top: 0.4em;
  margin-left: 0.6em;
  font-size: 2.2vmin;
  letter-spacing: 0.6em;
  color: var(--green);
  text-shadow: 0 0 8px var(--green);
}

.combo-max {
  margin-top: 0.6em;
  font-size: 1.3vmin;
  letter-spacing: 0.4em;
  color: rgba(0, 255, 65, 0.6);
}

.combo.punch {
  animation: combo-punch 0.25s cubic-bezier(0.2, 1.4, 0.4, 1);
}

.combo.milestone {
  animation: combo-milestone 0.55s cubic-bezier(0.2, 1.4, 0.4, 1);
}

.combo.shatter {
  animation: combo-shatter 0.5s ease-in forwards;
}

@keyframes combo-punch {
  from { transform: translateX(-50%) scale(1.3); }
  to   { transform: translateX(-50%) scale(1); }
}

@keyframes combo-milestone {
  from { transform: translateX(-50%) scale(1.6) skewX(-12deg); filter: brightness(2.5); }
  to   { transform: translateX(-50%) scale(1); }
}

@keyframes combo-shatter {
  0%   { transform: translateX(-50%) scale(1.1); }
  30%  { transform: translateX(-52%) skewX(20deg); filter: hue-rotate(200deg) brightness(1.5); }
  100% { transform: translateX(-50%) scale(0.6) translateY(4vh); filter: hue-rotate(200deg) blur(6px); opacity: 0; }
}

/* Judgements: pop above the ring, rise and vanish */
.judge {
  position: absolute;
  transform: translate(-50%, -50%);
  font-size: 2.4vmin;
  font-weight: 800;
  letter-spacing: 0.12em;
  white-space: nowrap;
  text-align: center;
  animation: judge-rise 0.75s ease-out forwards;
}

.judge::after {
  content: attr(data-jp);
  display: block;
  margin-top: 0.3em;
  font-family: sans-serif;
  font-size: 0.5em;
  font-weight: 400;
  letter-spacing: 0.5em;
  opacity: 0.85;
}

.judge.good {
  color: var(--green);
  text-shadow: 0 0 10px var(--green);
}

.judge.perfect {
  font-size: 3vmin;
  color: #ffffff;
  /* chromatic aberration */
  text-shadow: -3px 0 var(--pink), 3px 0 var(--cyan), 0 0 14px var(--lime);
  animation: judge-rise 0.8s ease-out forwards, judge-glitch 0.4s steps(2) 2;
}

.judge.miss {
  color: var(--pink);
  text-shadow: 0 0 10px var(--pink);
  animation: judge-rise 0.75s ease-out forwards, judge-jitter 0.3s steps(3) 2;
}

@keyframes judge-rise {
  0%   { opacity: 0; transform: translate(-50%, -30%) scale(0.6); }
  15%  { opacity: 1; transform: translate(-50%, -50%) scale(1.15); }
  30%  { transform: translate(-50%, -50%) scale(1); }
  100% { opacity: 0; transform: translate(-50%, -110%) scale(1); }
}

@keyframes judge-glitch {
  0%   { clip-path: inset(0 0 60% 0); translate: 3px 0; }
  50%  { clip-path: inset(40% 0 0 0); translate: -3px 0; }
  100% { clip-path: none; translate: 0 0; }
}

@keyframes judge-jitter {
  0%   { translate: -4px 0; }
  33%  { translate: 4px -2px; }
  66%  { translate: -2px 2px; }
  100% { translate: 0 0; }
}

/* Start screen and results */
.start,
.results {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.5vmin;
  background: radial-gradient(ellipse at center, rgba(0, 0, 0, 0.25), rgba(0, 0, 0, 0.8));
  font-family: 'Orbitron', sans-serif;
  text-transform: uppercase;
  text-align: center;
  color: var(--green);
  cursor: pointer;
  transition: opacity 0.6s;
}

.start.hidden,
.results.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.6s, visibility 0s 0.6s;
}

.start-sub {
  margin: 0;
  font-family: sans-serif;
  font-size: 2.2vmin;
  letter-spacing: 0.8em;
  opacity: 0.8;
}

.start-title {
  margin: 0;
  font-family: 'Monoton', 'Orbitron', cursive;
  font-weight: 400;
  font-size: 9vmin;
  letter-spacing: 0.12em;
  background: linear-gradient(180deg, #ffffff 0%, var(--lime) 45%, var(--green) 55%, #0b7a2a 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 14px rgba(0, 255, 65, 0.5));
}

.start-help {
  margin: 3vmin 0 0;
  font-size: 1.8vmin;
  letter-spacing: 0.15em;
  text-transform: none;
  opacity: 0.85;
}

.start-help kbd {
  margin: 0 0.1em;
  padding: 0.2em 0.5em;
  font: inherit;
  border: 1px solid;
}

.start-track {
  margin: 1vmin 0 0;
  font-size: 1.6vmin;
  letter-spacing: 0.3em;
  opacity: 0.7;
}

.start-press {
  margin-top: 4vmin;
  font-size: 2vmin;
  letter-spacing: 0.5em;
  opacity: 0.5;
}

/* Blinks once the song is ready */
.start.ready .start-press,
.results .start-press {
  opacity: 1;
  animation: blink 1.2s steps(2) infinite;
}

.start:not(.ready) {
  cursor: progress;
}

/* No song yet: nothing is loading, the player has to pick a file */
.start.needs-song {
  cursor: default;
}

.song-pick {
  margin-top: 2.5vmin;
  padding: 0.8em 1.4em;
  font: inherit;
  font-size: 1.5vmin;
  letter-spacing: 0.3em;
  text-transform: inherit;
  color: var(--green);
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid rgba(0, 255, 65, 0.5);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.song-pick:hover,
.song-pick:focus-visible {
  color: #000;
  background: var(--green);
  outline: none;
}

.results-title {
  margin: 0;
  font-weight: 900;
  font-style: italic;
  font-size: 6vmin;
  letter-spacing: 0.1em;
  background: linear-gradient(180deg, #ffffff 0%, var(--lime) 45%, var(--green) 55%, #0b7a2a 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 14px rgba(0, 255, 65, 0.5));
}

.results-values {
  display: grid;
  grid-template-columns: auto auto;
  gap: 1.2vmin 5vmin;
  margin: 4vmin 0 0;
  font-size: 2.2vmin;
  letter-spacing: 0.25em;
}

.results-values dt {
  text-align: right;
  opacity: 0.7;
}

.results-values dd {
  margin: 0;
  text-align: left;
  font-weight: 800;
  text-shadow: 0 0 8px var(--green);
}

@keyframes blink {
  to { opacity: 0; }
}