body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(to bottom, #f0f4f8, #d9e2ec);
  color: #333;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 100vh;
  padding: 20px 10px;
  margin: 0;
}

.container {
  background: #ffffff;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
  max-width: 800px;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

h1 {
  text-align: center;
  font-size: 1.5em;
  margin-bottom: 20px;
  color: #2c3e50;
}

.content-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  gap: 20px;
}

#hsvCone {
  display: block;
  margin: 0 auto;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  width: 280px;
  height: 280px;
  touch-action: none; /* let pointer drags orbit the view on touch screens instead of scrolling */
}

.controls-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  max-width: 400px;
}

.controls {
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 15px;
  width: 100%;
}

label {
  display: grid;
  grid-template-columns: auto;
  justify-items: start;
  gap: 8px;
  font-weight: 600;
  color: #34495e;
}

label > select,
label > input[type="number"] {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 1em;
  background: #f9f9f9;
  transition: border-color 0.3s ease;
  width: 100%;
}

label > input[type="number"] {
  width: 80px;
  text-align: center;
}

label > select:focus,
label > input[type="number"]:focus {
  border-color: #3498db;
  outline: none;
}

input[type="range"] {
  width: 100%;
  height: 8px;
  background: #e0e0e0;
  border-radius: 4px;
  appearance: none;
  transition: background 0.3s ease;
}

input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 20px;
  height: 20px;
  background: #3498db;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.1);
}

input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  background: #3498db;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s ease;
}

input[type="range"]::-moz-range-thumb:hover {
  transform: scale(1.1);
}

.sample {
  margin-top: 20px;
  text-align: center;
  width: 100%;
}

#colorBox {
  width: 100px;
  height: 100px;
  margin: 15px auto;
  border-radius: 12px;
  border: 2px solid #bdc3c7;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
  transition: transform 0.3s ease;
}

#colorBox:hover {
  transform: scale(1.05);
}

#hexDisplay {
  font-size: 1.2em;
  font-weight: bold;
  color: #2c3e50;
}

@media (min-width: 480px) {
  body {
    padding: 40px 20px;
  }

  .container {
    padding: 30px;
    border-radius: 16px;
  }

  h1 {
    font-size: 2em;
    margin-bottom: 30px;
  }

  .content-wrapper {
    gap: 30px;
  }

  #hsvCone {
    width: 350px;
    height: 350px;
  }

  .controls {
    margin-top: 20px;
    gap: 20px;
  }

  .sample {
    margin-top: 30px;
  }

  #colorBox {
    width: 120px;
    height: 120px;
  }

  label {
    grid-template-columns: auto 1fr auto auto;
    align-items: center;
    justify-items: start;
  }

  label > select,
  label > input[type="number"] {
    width: auto;
  }

  label > input[type="number"] {
    width: 60px;
  }
}

@media (min-width: 768px) {
  .content-wrapper {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
  }

  #hsvCone {
    width: 400px;
    height: 400px;
  }
}