body {
  background: #0D1117;
  color: #C9D1D9;
  font-family: "Segoe UI", sans-serif;
  margin: 0;
  padding: 2em;
  display: flex;
  justify-content: center;
}

.container {
  max-width: 700px;
  width: 100%;
  text-align: center;
}

h1 {
  font-size: 2em;
  margin-bottom: 0.2em;
}

p {
  font-size: 1.1em;
  margin-bottom: 1.5em;
}

.card {
  background: #161B22;
  padding: 2em;
  border-radius: 12px;
  box-shadow: 0 0 10px rgba(0,0,0,0.4);
  margin-bottom: 2em;
}

input[type="file"],
select,
input[type="range"] {
  width: 100%;
  margin: 0.5em 0;
  padding: 0.6em;
  border-radius: 6px;
  border: none;
  background: #0D1117;
  color: #C9D1D9;
}

.controls {
  text-align: left;
  margin-top: 1em;
}

.controls label {
  display: block;
  margin: 0.5em 0 0.2em;
}

.buttons {
  margin-top: 1em;
}

button {
  background-color: #2ea44f;
  color: white;
  font-weight: bold;
  padding: 0.6em 1.2em;
  margin: 0.5em;
  border-radius: 8px;
  font-size: 1em;
  cursor: pointer;
  border: none;
  transition: background-color 0.3s ease, transform 0.2s ease;
}

button:hover {
  background-color: #22863a;
  transform: scale(1.05);
}

button:active {
  transform: scale(0.98);
}

canvas {
  margin: 1em auto;
  display: block;
  border: 1px solid #C9D1D9;
}

textarea {
  width: 100%;
  background: #161B22;
  color: #C9D1D9;
  border: 1px solid #30363D;
  border-radius: 8px;
  padding: 1em;
  font-family: monospace;
}