:root {
  --primary-color: rgba(255, 94, 94, 1);
  --secondary-color: rgba(51, 51, 51, 1);
  --background-color: rgba(240, 240, 240, 1);
  --text-color: rgba(255, 255, 255, 1);
}

* {
  font-family: "Poppins", sans-serif;
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  background-color: var(--background-color);
  display: flex;
  flex-direction: column;
  height: 100vh;
}

header {
  text-align: center;
  padding: 2.5rem 1.25rem;
  animation: fadeIn 1s ease-in-out;
}

h1 {
  background: linear-gradient(
    45deg,
    rgba(102, 153, 255, 1),
    rgba(204, 255, 204, 1)
  );
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  color: rgba(51, 51, 51, 1);
  font-size: clamp(1.5rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: 0.0625rem;
  margin-bottom: 0.625rem;
  margin: 0;
  text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.1);
}

.instructions {
  font-weight: 400;
  color: rgba(102, 102, 102, 0.8);
  font-size: clamp(0.875rem, 2vw, 1.25rem);
  animation: fadeIn 2s ease-in-out;
}

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

.game-container {
  position: relative;
  flex-grow: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: var(--background-color);
  overflow: hidden;
}

canvas {
  width: 100%;
  height: 100%;
  display: block;
  background-color: rgba(255, 255, 255, 1);
}

.stress-meter {
  position: absolute;
  top: 0.625rem;
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  height: 1.25rem;
  background-color: rgba(221, 221, 221, 1);
  border-radius: 0.625rem;
  overflow: hidden;
  z-index: 10;
}

@media (max-width: 480px) {
  .stress-meter {
    width: 90%;
    height: 1rem;
  }
}

#stressBar {
  height: 100%;
  background-color: var(--primary-color);
  width: 0;
  transition: width 0.2s ease;
  will-change: width;
}

#gameOverScreen {
  position: absolute;
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background-color: rgba(51, 51, 51, 0.8);
  width: 100%;
  height: 100%;
  z-index: 100;
  text-align: center;
  color: var(--text-color);
  will-change: opacity, transform;
}

.game-over-text {
  font-size: 2rem;
  margin-bottom: 1.25rem;
}

#restartButton {
  padding: 0.625rem 1.25rem;
  background-color: var(--primary-color);
  color: var(--text-color);
  border: none;
  font-size: 1rem;
  cursor: pointer;
  border-radius: 0.3125rem;
  transition: background-color 0.3s ease;
}

#restartButton:hover {
  background-color: rgba(200, 50, 50, 1);
}

footer {
  text-align: center;
  padding: 0.625rem 0;
  background-color: var(--secondary-color);
  color: var(--text-color);
  flex-shrink: 0;
  font-size: 1rem;
}

footer a {
  color: rgba(153, 204, 255, 1);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

@media (max-width: 768px) {
  h1 {
    font-size: 1.5rem;
    line-height: 1;
    margin-bottom: 0.312rem;
  }

  footer {
    font-size: 0.8rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation: none;
    transition: none;
  }
}