html,
body {
  margin: 0;
  min-height: 100%;
  overflow: hidden;
  background:
    radial-gradient(circle at top, rgba(255, 213, 122, 0.55), transparent 24%),
    linear-gradient(180deg, #8fc2ff 0%, #d8efff 42%, #f6dca9 100%);
  color: #fff9df;
  font-family: "Verdana", "Trebuchet MS", sans-serif;
}

body {
  position: relative;
}

canvas {
  display: block;
  height: 100vh;
  width: 100vw;
}

#ui {
  inset: 0;
  position: absolute;
}

#score {
  background: rgba(8, 25, 46, 0.72);
  border: 2px solid rgba(255, 240, 163, 0.5);
  border-radius: 10px;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.2);
  font-size: 1rem;
  left: 16px;
  letter-spacing: 0.12em;
  line-height: 1.4;
  padding: 10px 14px;
  position: absolute;
  top: 14px;
  text-shadow: 0 2px 0 rgba(0, 0, 0, 0.45);
}

#metaHud {
  display: grid;
  gap: 10px;
  position: absolute;
  right: 16px;
  top: 14px;
}

#speed,
#status,
#checkpoint,
#nitroWrap {
  background: rgba(8, 25, 46, 0.72);
  border: 2px solid rgba(255, 240, 163, 0.5);
  border-radius: 10px;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.2);
  color: #fff9df;
  padding: 10px 14px;
  text-align: right;
  text-shadow: 0 2px 0 rgba(0, 0, 0, 0.45);
}

#nitroWrap {
  min-width: 150px;
}

#nitroWrap span {
  display: block;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  margin-bottom: 8px;
}

#nitroBar {
  background: rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  height: 10px;
  overflow: hidden;
}

#nitroFill {
  background: linear-gradient(90deg, #36d7ff 0%, #aaf4ff 100%);
  height: 100%;
  width: 100%;
}

#startScreen,
#gameOver {
  background: rgba(12, 28, 46, 0.88);
  border: 2px solid rgba(255, 231, 130, 0.65);
  border-radius: 14px;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.3);
  left: 50%;
  min-width: 240px;
  padding: 24px;
  pointer-events: auto;
  position: absolute;
  text-align: center;
  top: 50%;
  transform: translate(-50%, -50%);
}

#startScreen {
  display: flex;
  justify-content: center;
  min-width: 320px;
}

#startScreen .panel {
  max-width: 420px;
}

#startScreen h1,
#gameOver h1 {
  color: #ffe77f;
  letter-spacing: 0.12em;
  margin: 0 0 16px;
  text-transform: uppercase;
}

.eyebrow {
  color: #c9d8ea;
  letter-spacing: 0.16em;
  margin: 0 0 12px;
}

.bodyCopy {
  color: #eef4ff;
  line-height: 1.5;
  margin: 0 0 18px;
}

.metaCard {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 231, 130, 0.35);
  border-radius: 12px;
  margin-top: 18px;
  padding: 12px 14px;
}

.metaLabel {
  color: #c9d8ea;
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  margin: 0 0 6px;
  text-transform: uppercase;
}

.metaValue {
  color: #fff9df;
  font-size: 1rem;
  margin: 0 0 10px;
}

.metaCard a {
  color: #ffe77f;
  font-size: 0.88rem;
  font-weight: 700;
  text-decoration: none;
}

.metaCard a:hover {
  text-decoration: underline;
}

#gameOverCopy {
  color: #eef4ff;
  line-height: 1.5;
  margin: 0 0 18px;
}

button {
  background: linear-gradient(180deg, #ffd75b 0%, #f28d35 100%);
  border: 0;
  border-radius: 999px;
  box-shadow: inset 0 2px 0 rgba(255, 255, 255, 0.4);
  color: #14253f;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 10px 20px;
}

button:hover {
  filter: brightness(1.04);
}