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

:root {
  --top-ui: 112px;
  --bottom-ui: 104px;
  --score-h: 56px;
  --life-size: 20px;
}

/* Safer defaults for phones before JS measures exact heights */
@media screen and (max-width: 500px) {
  :root { --top-ui: 96px; --score-h: 48px; }
}

html, body {
  height: 100%;
  overflow: hidden;
}

.container {
  background-image: linear-gradient(
    174.2deg,
    rgba(255, 244, 228, 1) 7.1%,
    rgba(240, 246, 238, 1) 67.4%
  );

  width: 100%;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

.hide {
  display: none;
}

.car,
.enemy {
  position: absolute;
  bottom: 100px;
  margin: auto;
  width: 50px;
  height: 100px;
  background-color: white;
  line-height: 38px;
  font-size: 1.7em;
  text-align: center;
  vertical-align: middle;
  background-image: url(car.png);
  background-size: cover;
  border-radius: 10px;
}

.line {
  position: absolute;
  height: 100px;
  width: 10px;
  margin-left: calc(50% - 5px);
  background-color: white;
}

.score {
  background-color: rgba(0, 0, 0, 0.9);
  text-align: center;
  color: white;
  font-size: 2em;
  font-family: fantasy;
  padding: 14px 0;
  min-height: var(--score-h);
  position: sticky;
  top: 0;
  z-index: 10;
}

.controls {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-content: center;
  padding: 8px 10px;
  min-height: 40px;
}

.btn {
  background: #222;
  color: #fff;
  border: none;
  padding: 6px 10px;
  border-radius: 6px;
  cursor: pointer;
}

.btn:hover {
  background: #444;
}

.status {
  color: #111;
  background: #f1f1f1;
  padding: 4px 8px;
  border-radius: 6px;
}

.lives {
  display: flex;
  gap: 4px;
  align-items: center;
}

.life {
  display: inline-block;
  width: var(--life-size);
  height: var(--life-size);
  vertical-align: middle;
}
.life svg {
  width: 100%;
  height: 100%;
  display: block;
  fill: #ff2d55;
  filter: drop-shadow(0 0 6px rgba(255,45,85,0.45));
}

.nitroBar {
  width: 160px;
  height: 10px;
  border-radius: 6px;
  background: rgba(255,255,255,0.3);
  overflow: hidden;
}

.nitroFill {
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, #00e1ff, #00ff88);
}

.gameArea {
  background-color: black;
  width: 400px;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  position: relative;
  margin: auto;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
}

.mobileControls {
  display: none;
}

.mobileControls .ctrl {
  min-width: 56px;
  min-height: 56px;
  font-size: 20px;
  border-radius: 10px;
  border: none;
  background: #222;
  color: #fff;
}

.mobileControls .nitro {
  min-width: 96px;
}

.night .gameArea {
  background-color: #0b0f14;
}

.night .container {
  background-image: linear-gradient(180deg, #0f172a, #020617);
}

/* Night overlay and headlights */
.night .gameArea::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  pointer-events: none;
}

.night .car::before {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: 90px;
  width: 220px;
  height: 320px;
  background: radial-gradient(ellipse at 50% 0%, rgba(255, 255, 200, 0.9) 0%, rgba(255, 255, 200, 0.3) 40%, rgba(255, 255, 200, 0.08) 60%, rgba(0, 0, 0, 0) 70%);
  filter: blur(2px);
  opacity: 0.9;
  pointer-events: none;
}

/* Environment themes */
.gameArea {
  background-repeat: repeat-y;
  background-position: 0 0;
  background-size: 400px 200px; /* tile height for scroll */
}

/* Jungle: dark asphalt with green trees on sides */
.env-jungle .gameArea {
  background-color: #0b0f14;
  background-image:
    radial-gradient(circle at 30px 40px, rgba(34,139,34,0.8) 0 14px, transparent 15px),
    radial-gradient(circle at 370px 120px, rgba(46,160,67,0.8) 0 16px, transparent 17px);
}

/* City: darker road with building silhouettes on sides */
.env-city .gameArea {
  background-color: #0f1115;
  background-image:
    linear-gradient(to bottom, transparent 0 100%),
    repeating-linear-gradient(to top, transparent 0 160px, transparent 160px, transparent 200px),
    linear-gradient(to bottom, transparent 0 100%),
    linear-gradient(to bottom, #2b2f3a 0 100%);
  background-size: 400px 200px, 40px 200px, 400px 200px, 60px 200px;
  background-position: left top, 12px 0, right top, 328px 0;
  background-repeat: repeat-y;
}

/* Desert: warm sand tones and cacti dots on sides */
.env-desert .gameArea {
  background-color: #3a2c1a;
  background-image:
    radial-gradient(circle at 30px 60px, rgba(255, 230, 150, 0.75) 0 10px, transparent 11px),
    radial-gradient(circle at 370px 140px, rgba(250, 210, 120, 0.75) 0 12px, transparent 13px);
}

.start {
  position: absolute;
  background-color: limegreen;
  padding: 10px;
  border-radius: 5px;
  left: 50%;
  top: 45%;
  transform: translate(-50%, -50%);
  color: black;
  z-index: 1;
  text-align: center;
  font-size: 1.5em;
  cursor: pointer;
}

.start:hover {
  background-color: orangered;
  color: white;
  transform: translate(-50%, -50%) scale(1.1);
}

.car.glow {
  box-shadow: 0 0 16px 6px rgba(0, 255, 200, 0.7);
}

.car.hit {
  animation: flash 0.2s steps(2, end) 6;
}

@keyframes flash {
  0% { opacity: 1; }
  50% { opacity: 0.2; }
  100% { opacity: 1; }
}

.pauseScreen {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(244, 244, 44, 0.8);
  color: black;
  padding: 20px;
  border-radius: 5px;
  text-align: center;
  z-index: 20;
}

@keyframes fadeOut {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

.fadeOut {
  animation-name: fadeOut;
  animation-duration: 1s;
  animation-fill-mode: forwards;
}

@media screen and (max-width: 500px) {
  html, body, .container {
    background: #000 !important;
    height: 100vh;
    height: 100dvh;
  }
  .container {
    /* reserve space for fixed score+controls and bottom controls (measured in JS) */
    padding-top: calc(env(safe-area-inset-top, 0) + var(--top-ui));
    padding-bottom: calc(env(safe-area-inset-bottom, 0) + var(--bottom-ui));
  }
  .gameArea {
    width: 100vw;
    height: calc(100vh - (env(safe-area-inset-top, 0) + var(--top-ui)) - (env(safe-area-inset-bottom, 0) + var(--bottom-ui)));
    height: calc(100dvh - (env(safe-area-inset-top, 0) + var(--top-ui)) - (env(safe-area-inset-bottom, 0) + var(--bottom-ui)));
    margin: 0;
  }
  .startScreen {
    width: 90%;
    left: 5%;
  }
  .score {
    position: fixed;
    top: env(safe-area-inset-top, 0);
    left: 0;
    right: 0;
    font-size: 1.2em;
    padding: 8px 0;
  }
  .controls {
    position: fixed;
    top: calc(env(safe-area-inset-top, 0) + var(--score-h));
    left: 0;
    right: 0;
    z-index: 9;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
    padding: 6px;
    gap: 6px;
    flex-wrap: wrap;
    justify-content: center;
  }
  .btn { padding: 8px 10px; font-size: 12px; }
  .status { font-size: 12px; }
  .mobileControls {
    position: fixed;
    left: 0;
    right: 0;
    bottom: env(safe-area-inset-bottom, 8px);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 12px 10px;
    z-index: 12;
    touch-action: none;
    -webkit-user-select: none;
    user-select: none;
  }
  .mobileControls .updown {
    display: flex;
    flex-direction: column;
    gap: 8px;
  }
  .mobileControls .ctrl { min-width: 60px; min-height: 60px; font-size: 20px; }
  .mobileControls .nitro { min-width: 100px; font-size: 15px; }
}

/* Extra compact for very short screens */
@media screen and (max-height: 640px) {
  :root { --score-h: 44px; }
  .score { font-size: 1.05em; padding: 6px 0; }
  .controls { padding: 4px; gap: 4px; }
  .btn { padding: 6px 8px; font-size: 11px; }
  .status { font-size: 11px; }
  .mobileControls { padding: 10px 8px; gap: 10px; }
  .mobileControls .ctrl { min-width: 56px; min-height: 56px; font-size: 18px; }
  .mobileControls .nitro { min-width: 92px; font-size: 14px; }
}

/* Ultra-compact for very short phones */
@media screen and (max-height: 560px) {
  :root { --score-h: 40px; }
  .score { font-size: 1em; padding: 5px 0; }
  .controls {
    padding: 4px;
    gap: 4px;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  .btn { padding: 5px 7px; font-size: 10.5px; }
  .status { font-size: 10.5px; }
  .nitroBar { width: 120px; height: 8px; }
}

/* Extra-tiny phones */
@media screen and (max-height: 520px) {
  :root { --score-h: 36px; --life-size: 14px; }
  .score { font-size: 0.95em; padding: 4px 0; }
  .controls { padding: 3px; gap: 3px; }
  .btn { padding: 4px 6px; font-size: 10px; }
  .status { font-size: 10px; }
  .nitroBar { width: 110px; height: 7px; }
  .lives { gap: 3px; }
}

/* Ultra-tiny phones */
@media screen and (max-height: 480px) {
  :root { --score-h: 34px; --life-size: 12px; }
  .score { font-size: 0.9em; padding: 3px 0; }
  .controls { padding: 2px; gap: 2px; }
  .btn { padding: 3px 5px; font-size: 9.5px; }
  .status { display: none; }
  .nitroBar { width: 100px; height: 6px; }
  .lives { gap: 2px; }
}