*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: sans-serif;
  background: #f5f6f8;
  color: #222;
  padding: 12px;
  max-width: 680px;
  margin: 0 auto;
}

h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: #444;
}

#kb {
  width: 100%;
  max-width: 640px;
  height: auto;
  touch-action: none;
  display: block;
  border: 1px solid #d0d3da;
  border-radius: 8px;
  background: #fff;
}

#text {
  min-height: 2.4em;
  background: #fff;
  border: 1px solid #d0d3da;
  border-radius: 6px;
  padding: 8px 12px;
  margin-top: 10px;
  font-size: 1.1rem;
  word-break: break-word;
  color: #111;
}

#cands {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
  min-height: 2.2em;
}

#cands .chip {
  background: #e4ecfa;
  border: 1px solid #b3c6ef;
  border-radius: 16px;
  padding: 4px 14px;
  font-size: 0.95rem;
  cursor: pointer;
  user-select: none;
  color: #1a3a7a;
  transition: background 0.15s;
}

#cands .chip:hover,
#cands .chip:active {
  background: #c5d9f7;
}

#controls {
  margin-top: 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

#controls .slider {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: #555;
}

#controls .slider input[type="range"] {
  vertical-align: middle;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 10px;
}

#clear {
  background: #fff;
  border: 1px solid #c0c4cc;
  border-radius: 6px;
  padding: 6px 16px;
  font-size: 0.9rem;
  cursor: pointer;
  color: #444;
  transition: background 0.15s;
}

#clear:hover {
  background: #f0f1f4;
}

#status {
  font-size: 0.82rem;
  color: #666;
  flex: 1;
}

/* Heatmap canvas (Chunk 3) — hidden by default, shown when #heatToggle checked */
#heat {
  display: none;
  max-width: 640px;
  width: 100%;
  height: auto;
  border: 1px solid #d0d3da;
  border-radius: 6px;
  margin-top: 10px;
  background: #fff;
}

.heat-toggle {
  font-size: 0.82rem;
  color: #555;
  display: flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  user-select: none;
}

/* Chunk 5 — custom word row */
#customWordRow {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}

#customWord {
  border: 1px solid #c0c4cc;
  border-radius: 6px;
  padding: 5px 10px;
  font-size: 0.88rem;
  color: #333;
  background: #fff;
  width: 160px;
  outline: none;
}

#customWord:focus {
  border-color: #4a90e2;
  box-shadow: 0 0 0 2px rgba(74, 144, 226, 0.2);
}

#addWord {
  background: #4a90e2;
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 5px 14px;
  font-size: 0.88rem;
  cursor: pointer;
  transition: background 0.15s;
}

#addWord:hover {
  background: #357abd;
}

#customList {
  font-size: 0.8rem;
  color: #666;
  font-style: italic;
  min-height: 1.2em;
}

/* cross-page nav */
.topnav { display:flex; gap:14px; padding:8px 0 14px; font-size:0.95rem; }
.topnav a { color:#4a90e2; text-decoration:none; padding:4px 10px; border-radius:6px; }
.topnav a:hover { background:#eef3fb; }
.topnav a.active { font-weight:700; color:#1f2430; background:#e9eef5; }