:root {
  --bg: #e6f2ff;
  --card: #ffffff;
  --text: #16243d;
  --border: #cad8ea;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
}

.wrap {
  max-width: 420px;
  margin: 20px auto;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--card);
}

h1 {
  margin: 0 0 10px;
}

.bar {
  display: flex;
  justify-content: space-between;
  margin-bottom: 10px;
}

canvas {
  display: block;
  width: 100%;
  max-width: 360px;
  margin: 0 auto;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #f6fbff;
  touch-action: manipulation;
}

.controls {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 10px;
  flex-wrap: wrap;
}

.result {
  margin-top: 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  text-align: center;
  padding: 8px 10px;
  display: none;
}

.result p {
  margin: 4px 0;
}

.result-title {
  margin-top: 8px;
  font-weight: 700;
}

.result-top {
  margin: 6px 0 0;
  padding-left: 20px;
  text-align: left;
  font-size: 14px;
}


button {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  padding: 8px 14px;
  font-weight: 600;
}