:root {
  --bg-color: #ffffff;
  --text-color: #1a1a1a;
  --input-bg: #f0f0f0;
  --input-border: #ccc;
  --button-bg: #007bff;
  --button-hover: #0056b3;
  --wordlist-bg: #f9f9f9;
  --checkbox-accent: #007bff;
}

.dark {
  --bg-color: #171717;
  --text-color: #e0e0e0;
  --input-bg: #1f1f1f;
  --input-border: #333;
  --button-bg: #2e7d32;
  --button-hover: #388e3c;
  --wordlist-bg: #1f1f1f;
  --checkbox-accent: #4caf50;
}

body {
  font-family: 'Segoe UI', sans-serif;
  width: 400px;
  margin: 0;
  padding: 0;
  background: var(--bg-color);
  color: var(--text-color);
  transition: background 0.3s ease, color 0.3s ease;
  max-height: 600px;
  overflow: hidden;
}

.container {
  padding: 12px;
  height: 100%;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

h1 {
  font-size: 1.5em;
  margin-bottom: 16px;
  color: var(--text-color);
  text-align: center;
}

.section {
  margin-bottom: 0;
}

.word-list-section {
  flex: 1;
  min-height: 200px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

input[type="text"],
textarea,
select {
  width: 100%;
  box-sizing: border-box;
  margin-top: 4px;
  margin-bottom: 6px;
  padding: 6px;
  border-radius: 6px;
  border: 1px solid var(--input-border);
  background-color: var(--input-bg);
  color: var(--text-color);
  transition: background 0.3s, color 0.3s, border-color 0.3s;
}

textarea {
  height: 60px;
  resize: vertical;
  background-color: var(--input-bg) !important;
  color: var(--text-color) !important;
  border: 1px solid var(--input-border) !important;
}

input[type="color"] {
  background-color: transparent;
  border: none;
  cursor: pointer;
  width: 36px;
  height: 36px;
}

input[type="checkbox"] {
  -webkit-appearance: none;
  appearance: none;
  accent-color: var(--checkbox-accent);
  background-color: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 4px;
  width: 16px;
  height: 16px;
  transform: scale(1.2);
  cursor: pointer;
}

input[type="checkbox"]:checked::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 5px;
  width: 4px;
  height: 9px;
  border: solid var(--checkbox-accent);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

button {
  margin: 2px;
  padding: 6px 10px;
  font-size: 0.85em;
  border: none;
  border-radius: 6px;
  background-color: var(--button-bg);
  color: white;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

button:hover {
  background-color: var(--button-hover);
}

#wordList {
  position: relative;
  overflow-y: auto;
  overflow-x: hidden;
  flex: 1;
  background: var(--wordlist-bg);
  border-radius: 6px;
  padding: 4px;
  min-height: 200px;
}

#wordList>div {
  display: flex;
  align-items: center;
  margin-bottom: 4px;
  gap: 4px;
  background: var(--wordlist-bg);
  padding: 4px;
  border-radius: 6px;
  will-change: transform;
  flex-wrap: nowrap;
  position: absolute;
  left: 4px;
  right: 4px;
}

#wordList input[type="text"] {
  flex: 1;
  min-width: 0;
  background-color: var(--input-bg) !important;
  color: var(--text-color) !important;
  border: 1px solid var(--input-border) !important;
}

#wordList input[type="color"] {
  width: 24px;
  height: 24px;
  padding: 0;
  border-radius: 4px;
  flex-shrink: 0;
}

#wordList input[type="checkbox"] {
  flex-shrink: 0;
}

#wordList label {
  flex-shrink: 0;
  white-space: nowrap;
  margin: 0;
}

input[type="file"] {
  display: none;
}