:root {
  --font: 'Inter', sans-serif;
  --color-bg: #ffffff;
  --color-text: #111111;
  --color-accent: #00A288;
  --color-accent-dark: #004D66;
  --color-border: #ddd;
  --color-card: #f9f9f9;
}
body.dark {
  --color-bg: #1e1e1e;
  --color-text: #f5f5f5;
  --color-accent: #00A288;
  --color-accent-dark: #007060;
  --color-border: #444;
  --color-card: #2a2a2a;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-text);
  transition: background-color 0.3s ease, color 0.3s ease;
}
header {
  padding: 1.5rem;
  background: var(--color-card);
  border-bottom: 1px solid var(--color-border);
  text-align: center;
}
h1 {
  font-size: 2rem;
  margin: 0;
  font-weight: 700;
  background: linear-gradient(to right, var(--color-accent), var(--color-accent-dark));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.toggle-container {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 1rem;
  gap: 0.5rem;
}
.switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 24px;
}
.switch input { opacity: 0; width: 0; height: 0; }
.slider {
  position: absolute;
  cursor: pointer;
  background-color: #ccc;
  border-radius: 24px;
  top: 0; left: 0; right: 0; bottom: 0;
  transition: 0.4s;
}
.slider:before {
  content: "";
  position: absolute;
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  border-radius: 50%;
  transition: 0.4s;
}
input:checked + .slider {
  background-color: var(--color-accent);
}
input:checked + .slider:before {
  transform: translateX(26px);
}
main {
  padding: 2rem 1rem;
  max-width: 600px;
  margin: auto;
}
label {
  display: block;
  margin-top: 1rem;
  font-weight: 600;
}
input[type="text"], input[type="color"], input[type="number"] {
  width: 100%;
  padding: 0.7rem;
  margin-top: 0.3rem;
  border-radius: 5px;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text);
}
.options {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}
.options input[type="color"], .options input[type="number"] {
  flex: 1;
}
button {
  margin-top: 1.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  background: var(--color-accent);
  border: none;
  border-radius: 5px;
  color: white;
  cursor: pointer;
  display: block;
  width: 100%;
}
button:hover {
  background: var(--color-accent-dark);
}
.preview-section {
  text-align: center;
  margin-top: 2rem;
}
canvas {
  margin: 1rem auto;
  display: block;
  border: 1px solid var(--color-border);
  background: white;
}
footer {
  text-align: center;
  font-size: 0.9rem;
  padding: 1rem;
  color: #666;
}