:root {
  --bg: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --accent: #2563eb;
  --border: #e2e8f0;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.container {
  max-width: 520px;
  margin: 48px auto;
  padding: 0 16px;
}

h1 {
  font-size: 1.75rem;
  margin: 0 0 24px;
}

form {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

label {
  width: 100%;
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 4px;
}

input[type="text"] {
  flex: 1 1 200px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 1rem;
}

button {
  padding: 10px 16px;
  border: none;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font-size: 1rem;
  cursor: pointer;
}

button:hover {
  opacity: 0.9;
}

.preview {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.preview-swatch {
  height: 160px;
  width: 100%;
  background: #f1f5f9;
}

.preview-info {
  padding: 12px 14px;
  font-size: 0.95rem;
  background: #f8fafc;
  border-top: 1px solid var(--border);
}