:root {
  --bg: #ffffff;
  --text: #111111;
  --primary: #0b6cff;
  --card: #f5f7fa;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1117;
    --text: #e6edf3;
    --primary: #4da3ff;
    --card: #161b22;
  }
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.navbar {
  display: flex;
  justify-content: space-between;
  padding: 1rem 2rem;
  background: var(--card);
  border-bottom: 1px solid rgba(0,0,0,0.05);
}

.container {
  max-width: 900px;
  margin: 2rem auto;
  padding: 1rem;
}

.footer {
  text-align: center;
  padding: 2rem;
  opacity: 0.7;
}

button {
  padding: 10px 16px;
  border: none;
  background: var(--primary);
  color: white;
  border-radius: 6px;
  cursor: pointer;
}

button:hover {
  opacity: 0.9;
}

input {
  padding: 8px;
  border-radius: 6px;
  border: 1px solid #ccc;
  width: 100%;
  margin-bottom: 1rem;
}

@media (max-width: 768px) {
  .navbar {
    flex-direction: column;
    gap: 10px;
  }
}