/* --- theme vars --- */
:root {
  --bg: radial-gradient(circle at top left, #0a0a0f, #1a1a1f, #000);
  --text: #eee;
  --muted: #bbb;
  --highlight: rgb(68, 162, 255);
  --panel-bg: rgba(255, 255, 255, 0.08);
  --panel-blur: blur(10px);
  --canvas-bg: #111;
}

/* --- base layout --- */

body {
  height:100%;
  margin: 0;
  font-family: "Inter", "Poppins", sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  min-height: 100vh;
  padding: 2rem;
  transition: background 0.6s ease, color 0.6s ease;
  overflow: hidden;
}

div.wrap {height:100%; overflow:hidden;}

h1 {
  font-size: 2.2rem;
  margin-bottom: 0.5rem;
  background: linear-gradient(90deg, rgb(68, 162, 255), rgb(211, 52, 187));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-align: center;
}

p {
  max-width: 600px;
  text-align: center;
  color: var(--muted);
  margin-bottom: 1.5rem;
}

.whisper {
  opacity: 0.5;
  font-size: 0.75rem;
}

/* canvas wrapper */
#drawbox {
  width: 512px;
  height: 512px;
  background: var(--canvas-bg);
  border-radius: 1rem;
  box-shadow: 0 0 30px rgba(68, 162, 255, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  overflow: hidden;
  transition: background 0.6s ease;
}

#drawbox:hover {
  transform: scale(1.02);
  transition: transform 0.2s ease;
}

/* control panel */
.controls {
  backdrop-filter: var(--panel-blur);
  background: var(--panel-bg);
  border-radius: 1rem;
  padding: 1rem 1.5rem;
  margin-top: 1rem;
  box-shadow: 0 0 15px rgba(0,0,0,0.4);
  display: inline-block;
  transition: background 0.6s ease;
}

/* dropdown */
select {
  padding: 0.5rem;
  border-radius: 0.5rem;
  border: none;
  font-size: 1rem;
  background: #222;
  color: #eee;
  outline: none;
  margin-top: 0.5rem;
  margin-bottom: 1rem;
  transition: background 0.3s ease, color 0.3s ease;
}


select:hover {
  background: #333;
  cursor: pointer;
}

/* highlighted numbers */
#fromNum, #toNum, #iterNum, #scaleNum {
  color: var(--highlight);
  font-weight: bold;
  transition: color 0.6s ease;
}