/* =========================================================
   RESET
========================================================= */

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  overscroll-behavior: none;
}

body {
  background: #050505;
  color: #ffffff;

  font-family:
    Inter,
    Arial,
    Helvetica,
    sans-serif;

  user-select: none;
  touch-action: none;
}


/* =========================================================
   COLORS
========================================================= */

:root {
  --green: #b7ff32;
  --red: #ff3b3b;
  --gray: #777;
  --dark: #050505;
}


/* =========================================================
   MOVING WORLD
========================================================= */

#scroll-world {
  position: fixed;

  inset: 0;

  overflow: hidden;

  pointer-events: none;

  z-index: 0;

  background:
    radial-gradient(
      circle at center,
      #151515 0%,
      #090909 45%,
      #030303 100%
    );
}


.grid {
  position: absolute;

  width: 200%;
  height: 300%;

  left: -50%;
  top: -100%;

  opacity: 0.2;

  background-image:
    linear-gradient(
      rgba(183, 255, 50, 0.14) 1px,
      transparent 1px
    ),
    linear-gradient(
      90deg,
      rgba(183, 255, 50, 0.08) 1px,
      transparent 1px
    );

  background-size:
    70px 70px;

  transform:
    perspective(500px)
    rotateX(55deg);

  transform-origin: center;

  will-change: background-position;
}


/* =========================================================
   HUD
========================================================= */

#hud {
  position: fixed;

  top: 0;
  left: 0;

  width: 100%;

  padding: 22px 26px;

  display: flex;
  justify-content: space-between;
  align-items: flex-start;

  z-index: 50;

  opacity: 0;

  transition: opacity 0.25s;
}

body.playing #hud {
  opacity: 1;
}


.hud-block {
  min-width: 130px;

  display: flex;
  flex-direction: column;
}


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


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


.hud-label {
  color: #777;

  letter-spacing: 3px;

  font-size: 10px;
  font-weight: 700;

  margin-bottom: 5px;
}


.hud-block strong {
  font-size: clamp(22px, 4vw, 36px);

  font-weight: 900;

  font-variant-numeric: tabular-nums;
}


#score,
#multiplier {
  color: var(--green);
}


/* =========================================================
   PERSONAL BEST
========================================================= */

#best-display {
  position: fixed;

  bottom: 18px;
  right: 22px;

  z-index: 50;

  color: #555;

  letter-spacing: 2px;

  font-size: 11px;

  transition: color 0.2s;
}

#best-display span {
  color: #888;
}


/* =========================================================
   SCREENS
========================================================= */

.screen {
  position: fixed;

  inset: 0;

  z-index: 10;

  display: flex;
  flex-direction: column;

  align-items: center;
  justify-content: center;

  text-align: center;

  padding: 30px;

  opacity: 0;
  visibility: hidden;

  transform: scale(0.98);

  transition:
    opacity 0.3s,
    transform 0.3s,
    visibility 0.3s;
}


.screen.active {
  opacity: 1;
  visibility: visible;

  transform: scale(1);
}


/* =========================================================
   START SCREEN
========================================================= */

.eyebrow {
  font-size: 11px;

  font-weight: 700;

  letter-spacing: 4px;

  color: #666;

  margin-bottom: 30px;
}


#start-screen h1 {
  font-size: clamp(74px, 15vw, 185px);

  line-height: 0.73;

  letter-spacing: -0.07em;

  font-weight: 950;
}


#start-screen h1 span {
  color: var(--green);
}


.subtitle {
  color: #999;

  margin-top: 36px;

  font-size: clamp(17px, 2vw, 22px);

  line-height: 1.5;
}


/* =========================================================
   START INDICATOR
========================================================= */

.start-scroll {
  margin-top: 65px;

  display: flex;
  flex-direction: column;

  align-items: center;

  gap: 12px;
}


.start-scroll > span {
  font-size: 11px;

  letter-spacing: 4px;

  color: #777;
}


.mouse {
  width: 28px;
  height: 45px;

  border: 2px solid #888;

  border-radius: 20px;

  display: flex;

  justify-content: center;

  padding-top: 8px;
}


.wheel {
  width: 3px;
  height: 8px;

  border-radius: 5px;

  background: var(--green);

  animation: wheelMove 1.2s infinite;
}


.arrow {
  color: var(--green);

  font-size: 30px;

  animation: arrowMove 1.2s infinite;
}


@keyframes wheelMove {

  0% {
    transform: translateY(0);
    opacity: 1;
  }

  100% {
    transform: translateY(12px);
    opacity: 0;
  }

}


@keyframes arrowMove {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(9px);
  }

}


/* =========================================================
   GAME SCREEN
========================================================= */

#game-screen {
  pointer-events: none;
}


#game-message {
  position: absolute;

  top: 50%;

  left: 50%;

  transform:
    translate(-50%, -50%);

  width: 90%;

  font-size: clamp(42px, 9vw, 120px);

  line-height: 0.9;

  font-weight: 950;

  letter-spacing: -0.05em;

  transition:
    transform 0.15s,
    opacity 0.15s;

  text-shadow:
    0 0 40px rgba(183, 255, 50, 0.05);
}


#distance-marker {
  position: absolute;

  top: 63%;

  font-size: clamp(20px, 5vw, 50px);

  font-weight: 900;

  color: var(--green);

  opacity: 0.35;

  font-variant-numeric: tabular-nums;
}


/* =========================================================
   INACTIVITY BAR
========================================================= */

#danger-bar {
  position: absolute;

  bottom: 58px;

  width: min(500px, 75vw);

  height: 5px;

  background: #1d1d1d;

  border-radius: 999px;

  overflow: hidden;
}


#danger-fill {
  width: 100%;
  height: 100%;

  transform-origin: left center;

  background: var(--green);

  transform: scaleX(1);
}


#danger-text {
  position: absolute;

  bottom: 30px;

  color: #666;

  font-size: 9px;

  letter-spacing: 4px;

  font-weight: 700;
}


/* =========================================================
   SPEED LINES
========================================================= */

#speed-lines {
  position: absolute;

  inset: 0;

  overflow: hidden;

  opacity: 0;

  transition: opacity 0.3s;
}


.speed-line {
  position: absolute;

  width: 2px;

  background: linear-gradient(
    transparent,
    rgba(183,255,50,0.75)
  );

  border-radius: 10px;

  will-change: transform;
}


/* =========================================================
   GAME OVER
========================================================= */

#game-over {
  background:
    radial-gradient(
      circle at center,
      #151515,
      #050505 65%
    );

  z-index: 100;
}


.red {
  color: var(--red);
}


#game-over h2 {
  font-size: clamp(70px, 13vw, 170px);

  line-height: 0.78;

  letter-spacing: -0.07em;

  font-weight: 950;
}


.score-label {
  margin-top: 38px;

  color: #666;

  letter-spacing: 4px;

  font-size: 10px;
}


#final-score {
  margin-top: 8px;

  font-size: clamp(65px, 10vw, 125px);

  line-height: 1;

  font-weight: 950;

  color: var(--green);

  font-variant-numeric: tabular-nums;
}


/* =========================================================
   RESULTS
========================================================= */

.results {
  display: flex;

  justify-content: center;

  gap: clamp(25px, 7vw, 80px);

  margin-top: 35px;
}


.result {
  display: flex;

  flex-direction: column;

  gap: 7px;
}


.result span {
  color: #555;

  font-size: 9px;

  letter-spacing: 3px;
}


.result strong {
  font-size: clamp(18px, 3vw, 28px);

  font-variant-numeric: tabular-nums;
}


/* =========================================================
   NEW BEST
========================================================= */

#new-best {
  color: var(--green);

  font-weight: 800;

  letter-spacing: 3px;

  font-size: 11px;

  margin-top: 30px;

  opacity: 0;
}


#new-best.visible {
  opacity: 1;

  animation: bestPulse 0.8s infinite alternate;
}


@keyframes bestPulse {

  from {
    transform: scale(1);
  }

  to {
    transform: scale(1.06);
  }

}


/* =========================================================
   BUTTONS
========================================================= */

.button-row {
  margin-top: 26px;

  display: flex;

  flex-wrap: wrap;

  justify-content: center;

  gap: 12px;
}


button {
  appearance: none;

  border: none;

  border-radius: 100px;

  padding: 18px 31px;

  font-size: 13px;

  font-weight: 900;

  letter-spacing: 1px;

  cursor: pointer;

  transition:
    transform 0.15s,
    background 0.15s;
}


#retry-button {
  background: var(--green);

  color: #050505;
}


.secondary-button {
  background: #151515;

  color: #ffffff;

  border: 1px solid #333;
}


button:hover {
  transform: scale(1.05);
}


button:active {
  transform: scale(0.97);
}


#share-status {
  min-height: 20px;

  margin-top: 14px;

  color: #777;

  font-size: 12px;
}


/* =========================================================
   HIGH SPEED EFFECTS
========================================================= */

body.speed-2 #game-message {
  text-shadow:
    0 0 40px rgba(183, 255, 50, 0.15);
}


body.speed-3 #game-message {
  text-shadow:
    3px 0 rgba(255, 0, 0, 0.2),
    -3px 0 rgba(0, 150, 255, 0.2);
}


body.speed-4 #game-screen {
  animation: subtleShake 0.12s infinite;
}


@keyframes subtleShake {

  0% {
    transform: translate(0, 0);
  }

  25% {
    transform: translate(1px, -1px);
  }

  50% {
    transform: translate(-1px, 1px);
  }

  75% {
    transform: translate(1px, 1px);
  }

  100% {
    transform: translate(0, 0);
  }

}


/* =========================================================
   MOBILE
========================================================= */

@media (max-width: 600px) {

  #hud {
    padding: 15px;
  }

  .hud-block {
    min-width: auto;
  }

  .hud-label {
    letter-spacing: 2px;
    font-size: 8px;
  }

  #start-screen h1 {
    letter-spacing: -5px;
  }

  .results {
    width: 100%;

    justify-content: space-around;

    gap: 10px;
  }

  .button-row {
    flex-direction: column;

    width: min(320px, 90vw);
  }

  button {
    width: 100%;
  }

}