:root {
  --primary-color: #007bff;
  --primary-dark: #0056b3;
  --text-dark: #21201e;
  --border-color: gray;
  --white: #ffffff;
  --spacing-small: 10px;
  --spacing-medium: 20px;
  --spacing-large: 50px;
  --border-radius: 10px;
}

#sleepPart {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.8);
  z-index: 9999;
  display: none;
  justify-content: center;
  align-items: center;
  overflow-y: auto;
}

#sleep-container-page{
  background-color: var(--white);
  padding: var(--spacing-medium);
  border-radius: var(--border-radius);
  max-width: 600px;
  width: 90%;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

#sleepPart h2 {
  text-align: center;
  color: var(--text-dark);
  margin-bottom: var(--spacing-medium);
  font-size: 24px;
}

#list-speed {
  gap: var(--spacing-small);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  list-style: none;
  padding: 0;
  margin: 0 auto var(--spacing-medium);
}

#list-speed li {
  list-style: none;
  border: 2px solid var(--border-color);
  padding: var(--spacing-small);
  font-size: 18px;
  font-weight: bold;
  color: var(--primary-color);
  cursor: pointer;
  text-align: center;
  border-radius: 5px;
  background-color: var(--white);
  transition: all 0.3s ease;
}

#list-speed li:hover {
  background-color: #e7f3ff;
  border-color: var(--primary-color);
}

#list-speed li[style*="background-color"] {
  background-color: var(--primary-color) !important;
  color: var(--white);
  border-color: var(--primary-dark);
}

#button-speed {
  margin-top: var(--spacing-large);
  display: flex;
  gap: var(--spacing-medium);
  justify-content: center;
  align-items: center;
}

#cancel-speed,
#ok-speed {
  font-size: 18px;
  background-color: var(--primary-color);
  color: var(--white);
  border: 2px solid var(--primary-dark);
  border-radius: var(--border-radius);
  padding: 12px 24px;
  cursor: pointer;
  font-weight: bold;
  transition: background-color 0.3s ease;
}

#cancel-speed:hover,
#ok-speed:hover {
  background-color: var(--primary-dark);
}

#cancel-speed:active,
#ok-speed:active {
  background-color: #004085;
}

#custom-input-card {
  background-color: #e7f3ff;
  border: 2px solid var(--primary-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-medium);
  margin: var(--spacing-medium) 0;
  display: none;
}

#custom-input-card > span:first-of-type {
  display: flex;
  gap: 15px;
  align-items: center;
  margin-bottom: 15px;
  font-size: 16px;
  font-weight: bold;
  color: var(--text-dark);
}

#custom-input-card > span:last-of-type {
  display: flex;
  gap: 15px;
  align-items: center;
}

#custom-input-card input[type="number"] {
  width: 100px;
  padding: 10px;
  border: 2px solid var(--border-color);
  border-radius: 5px;
  font-size: 16px;
  text-align: center;
}

#custom-input-card input[type="number"]:focus {
  outline: none;
  border-color: var(--primary-color);
}

#error {
  color: red;
  font-size: 14px;
  margin-top: var(--spacing-small);
  text-align: center;
  display: none;
}

@media (max-width: 768px) {
  #sleepPart h2 {
    font-size: 20px;
  }

  #list-speed {
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    gap: 8px;
  }

  #list-speed li {
    font-size: 16px;
    padding: 8px;
  }

  #button-speed {
    gap: 15px;
    margin-top: 30px;
  }

  #cancel-speed,
  #ok-speed {
    font-size: 16px;
    padding: 10px 20px;
  }

  #custom-input-card > span:first-of-type {
    flex-direction: column;
    gap: 10px;
    align-items: flex-start;
  }

  #custom-input-card > span:last-of-type {
    flex-direction: column;
    gap: 10px;
  }

  #custom-input-card input[type="number"] {
    width: 100%;
    max-width: 250px;
    font-size: 14px;
  }
}

@media (max-width: 480px) {
  #list-speed {
    grid-template-columns: 1fr;
    max-width: 200px;
    margin-left: auto;
    margin-right: auto;
  }

  #button-speed {
    flex-direction: column;
    gap: var(--spacing-small);
  }

  #cancel-speed,
  #ok-speed {
    width: 100%;
    max-width: 200px;
  }
}