body {
  font-family: "Nunito", sans-serif;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  min-height: 100vh;
  height: 100vh;
  margin: 0;
  color: #333;
  overflow: hidden;
  flex-direction: column;
  box-sizing: border-box;
}

.game-container {
  position: relative;
  text-align: center;
  background-color: rgba(255, 255, 255, 0.8);
  padding: 25px;
  border-radius: 15px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  max-width: 90%;
  width: 850px;
  margin: 20px auto 0 auto;
  flex-shrink: 0;
}

h1 {
  color: #4a69bd;
  margin-bottom: 15px;
  font-size: 2.5em;
}

canvas {
  display: block;
  margin: 0 auto 15px auto;
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
  max-width: 100%;
  height: auto;
}

#ui-container {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 10;
  color: white;
  text-shadow: 1px 1px 2px black;
  font-size: 1.1em;
}

#ui-container p {
  margin: 5px 0;
}

#score {
  font-weight: bold;
  color: #333;
}

#gameOverOverlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.75);
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  z-index: 20;
}

#gameOverOverlay.visible {
  opacity: 1;
  visibility: visible;
}

#gameOverContent {
  background-color: white;
  padding: 30px 40px;
  border-radius: 10px;
  text-align: center;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  color: #333;
}

#gameOverContent h2 {
  color: #e74c3c;
  margin-bottom: 15px;
  font-size: 2em;
}

#gameOverContent p {
  margin: 10px 0;
  font-size: 1.2em;
}

#finalScore,
#highScoreDisplay {
  font-weight: bold;
}

#restartButton {
  background-color: #4a69bd;
  color: white;
  border: none;
  padding: 12px 25px;
  font-size: 1.1em;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.2s ease;
  margin-top: 20px;
  font-family: "Nunito", sans-serif;
  font-weight: bold;
}

#restartButton:hover {
  background-color: #3b5998;
}

#soundToggleBtn {
  position: absolute;
  top: 20px;
  right: 20px;
  background: transparent;
  border: 2px solid #4a69bd;
  color: #4a69bd;
  font-size: 1.3em;
  width: 45px;
  height: 45px;
  border-radius: 50%;
  cursor: pointer;
  z-index: 25;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s, color 0.2s;
}
#soundToggleBtn:hover {
  background-color: #4a69bd;
  color: white;
}

#startScreenOverlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.75);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 20;
}

#startScreenContent {
  background-color: white;
  padding: 30px 40px;
  border-radius: 10px;
  text-align: center;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  color: #333;
  max-width: 90%;
  width: auto;
  min-width: 280px;
}

#instructions {
  margin: 15px 0 20px 0;
  font-size: 1.1em;
  line-height: 1.6;
  color: #555;
}

#startGameButton {
  background-color: #28a745;
  color: white;
  border: none;
  padding: 12px 25px;
  font-size: 1.1em;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.2s ease;
  margin-top: 15px;
  margin-bottom: 10px;
  font-family: "Nunito", sans-serif;
  font-weight: bold;
}

#startGameButton:hover {
  background-color: #218838; /* 더 어두운 녹색 */
}

.start-hint {
  font-size: 0.9em !important;
  color: #777;
  margin-top: 10px !important;
}

.sound-credit {
  font-size: 0.8em;
  color: #999;
  margin-top: 15px;
}

.restart-hint {
  font-size: 0.9em !important;
  color: #888;
  margin-top: 15px !important;
}

.hidden {
  display: none !important;
}

.blog-link-container {
  text-align: center;
  margin-top: 25px;
  margin-bottom: 20px;
  width: 100%;
  flex-shrink: 0;
}

.blog-link-container a {
  font-family: "Nunito", sans-serif;
  color: #4a69bd;
  text-decoration: none;
  font-size: 0.95em;
  padding: 5px 10px;
  border-radius: 5px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.blog-link-container a:hover {
  color: #ffffff;
  background-color: #4a69bd;
  text-decoration: none;
}

@media (max-width: 880px) {
  .game-container {
    width: 90%;
  }
}

@media (max-width: 600px) {
  .game-container {
    padding: 15px;
    margin-top: 15px;
  }
  h1 {
    font-size: 2em;
  }
  #ui-container {
  }
  #startScreenContent {
    padding: 20px 30px;
  }
  #gameOverContent {
    padding: 20px 30px;
  }
  #startGameButton {
    padding: 10px 20px;
    font-size: 1em;
  }
  #gameOverContent h2 {
    font-size: 1.8em;
  }
  #gameOverContent p {
    font-size: 1.1em;
  }
  #restartButton {
    padding: 10px 20px;
    font-size: 1em;
  }
  .blog-link-container {
    margin-top: 20px;
    margin-bottom: 15px;
  }
}

@media (max-height: 650px) {
  body {
    justify-content: flex-start;
  }
  .game-container {
    margin-top: 10px;
    padding: 15px;
  }
  h1 {
    font-size: 1.8em;
    margin-bottom: 10px;
  }
  #startScreenContent {
    padding: 15px 25px;
  }
  #instructions {
    font-size: 1em;
    margin: 10px 0 15px 0;
  }
  #startGameButton {
    padding: 8px 18px;
    font-size: 0.9em;
    margin-top: 10px;
    margin-bottom: 5px;
  }
  .start-hint {
    font-size: 0.8em !important;
    margin-top: 5px !important;
  }
  .blog-link-container {
    margin-top: 15px;
    margin-bottom: 10px;
  }
  #gameOverContent {
    padding: 15px 25px;
  }
  #gameOverContent h2 {
    font-size: 1.6em;
  }
}