:root {
  --primary-color: #5c6bc0;
  --secondary-color: #42a5f5;
  --accent-color: #ffca28;
  --success-color: #66bb6a;
  --error-color: #ef5350;
  --background-color: #f5f5f5;
  --text-color: #212121;
  --border-color: #e0e0e0;
  --shadow-color: rgba(0, 0, 0, 0.12);
  --default-color: var(--primary-color);
  --comparing-color: var(--accent-color);
  --swapping-color: var(--error-color);
  --sorted-color: var(--success-color);
  --default-padding: 20px;
  --default-margin: 20px;
  --small-gap: 5px;
  --medium-gap: 10px;
  --large-gap: 15px;
  --xlarge-gap: 30px;
  --default-border-radius: 8px;
  --bar-border-radius: 6px;
  --thumb-border-radius: 50%;
  --default-font-size: 1rem;
  --small-font-size: 0.9rem;
  --xsmall-font-size: 0.8rem;
  --default-font-weight: 500;
  --bold-font-weight: 600;
}

body {
  font-family: "Noto Sans KR", sans-serif;
  background: var(--background-color);
  color: var(--text-color);
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  height: 100vh;
  line-height: 1.6;
  width: 100vw;
  overflow-x: hidden;
  justify-content: center;
  align-items: center;
}

.container {
  width: 100%;
  max-width: 1200px;
  height: 100%;
  margin: 0 auto;
  padding: 0;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

header,
main,
nav,
section {
  width: 100%;
}

header {
  text-align: center;
  margin-bottom: var(--xlarge-gap);
  padding: 0 var(--default-padding);
  box-sizing: border-box;
}

header h1 {
  font-size: 2.2rem;
  font-weight: var(--bold-font-weight);
  word-break: keep-all;
}

.controls {
  display: flex;
  gap: var(--large-gap);
  margin: var(--default-margin) 0;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  padding: 0 var(--default-padding);
  box-sizing: border-box;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: var(--small-gap);
  align-items: center;
  width: 100%;
}

.control-group label {
  font-weight: var(--default-font-weight);
}

button,
select,
input {
  padding: 10px var(--default-padding);
  border: 1px solid var(--border-color);
  border-radius: var(--default-border-radius);
  cursor: pointer;
  background-color: white;
  box-shadow: 0 3px 6px var(--shadow-color);
  transition: background-color 0.3s ease, transform 0.2s ease,
    box-shadow 0.2s ease;
  font-size: var(--default-font-size);
  width: 100%;
  box-sizing: border-box;
}

button:hover,
select:hover,
input:hover {
  background-color: var(--primary-color);
  color: white;
  transform: translateY(-3px);
  box-shadow: 0 5px 10px var(--shadow-color);
}

button:active,
select:active,
input:active {
  transform: translateY(1px);
  box-shadow: 0 2px 4px var(--shadow-color);
}

#array-container {
  display: flex;
  align-items: flex-end;
  height: 400px;
  gap: 2px;
  padding: var(--large-gap);
  background: white;
  box-shadow: 0 6px 12px var(--shadow-color);
  border-radius: 10px;
  overflow: hidden;
  width: 100%;
  box-sizing: border-box;
  margin-bottom: var(--default-margin);
}

.bar {
  flex: 1;
  background: var(--default-color);
  transition: height 0.3s ease, background-color 0.3s ease;
  border-radius: var(--bar-border-radius) var(--bar-border-radius) 0 0;
  min-width: 1px;
}

.legend-container {
  margin-top: var(--default-margin);
  display: flex;
  justify-content: center;
}

#legend {
  display: flex;
  gap: var(--medium-gap);
  justify-content: center;
  align-items: center;
  list-style: none;
  padding: 0;
  flex-wrap: wrap;
  box-sizing: border-box;
  margin: 5px;
}

#legend li {
  display: flex;
  align-items: center;
  gap: var(--small-gap);
  font-size: 14px;
  margin: var(--small-gap);
}

#legend span {
  display: inline-block;
  width: 15px;
  height: 15px;
  margin-right: var(--small-gap);
  border-radius: 50%;
  border: 1px solid #ccc;
}

#legend p {
  margin: 0;
  font-size: var(--small-font-size);
}

.color-default {
  background: var(--default-color);
}

.color-comparing {
  background: var(--comparing-color);
}

.color-swapping {
  background: var(--swapping-color);
}

.color-sorted {
  background: var(--sorted-color);
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
  background: var(--border-color);
  height: 8px;
  border-radius: 4px;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  background: var(--primary-color);
  width: 16px;
  height: 16px;
  border-radius: var(--thumb-border-radius);
  margin-top: -4px;
  box-shadow: 0 2px 4px var(--shadow-color);
  transition: background-color 0.3s ease, box-shadow 0.2s ease;
}

input[type="range"]:hover::-webkit-slider-thumb {
  background: var(--secondary-color);
  box-shadow: 0 3px 6px var(--shadow-color);
}

.creator-info {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-color);
}

.creator-info a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
}

@media (min-width: 769px) {
  #array-container {
    margin: 0 auto;
    gap: 3px;
    padding: 20px;
  }

  .controls {
    flex-direction: row;
  }

  .control-group {
    width: auto;
  }

  button,
  select,
  input {
    width: auto;
  }
}

@media (max-width: 768px) {
  #array-container {
    height: 300px;
    padding: 10px;
    gap: 1px;
  }

  .controls {
    flex-direction: column;
  }

  .container {
    padding: 0 10px;
  }

  header,
  .controls,
  #legend {
    padding: 0 10px;
  }

  header h1 {
    font-size: 1.8rem;
  }

  #legend {
    flex-direction: row;
    gap: 5px;
  }

  #legend li {
    font-size: 12px;
    margin: 2px;
  }

  #legend span {
    width: 12px;
    height: 12px;
    margin-right: 3px;
  }
  .legend-container {
    margin-top: 10px;
  }
}

@media (max-width: 480px) {
  #array-container {
    height: 200px;
  }
  header h1 {
    font-size: 1.5rem;
  }
}

@media (orientation: landscape) and (max-width: 768px) {
  #array-container {
    height: 200px;
  }
}