body {
  margin: 0;
  font-family: Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  background: #f4f4f4;
}

.container {
  width: 90%;
  max-width: 1100px;
  margin: auto;
  overflow: hidden;
}

header {
  background: #0077b6;
  color: #fff;
  padding: 15px 0;
}

header h1 {
  text-align: center;
}

nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  padding: 0;
}

nav ul li {
  margin: 0 10px;
}

nav ul li a {
  color: #fff;
  text-decoration: none;
  font-weight: bold;
}

main {
  background: #fff;
  padding: 20px;
  margin-top: 20px;
  border-radius: 10px;
}

.tool {
  text-align: center;
  margin-top: 20px;
}

.tool input, .tool button, .tool select {
  margin: 10px;
  padding: 10px;
}

canvas {
  display: block;
  margin: 20px auto;
  max-width: 100%;
  border: 1px solid #ddd;
}

footer {
  background: #222;
  color: #ccc;
  padding: 20px 0;
  text-align: center;
  margin-top: 30px;
}

footer a {
  color: #ccc;
  margin: 0 5px;
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}