:root {
  color-scheme: light dark;
  --bg: #f7f5f2;
  --text: #1b1b1f;
  --card: #ffffff;
  --accent: #2b6cb0;
  --border: rgba(0, 0, 0, 0.15);
}

html[data-theme="dark"] {
  --bg: #111216;
  --text: #f4f4f6;
  --card: #1a1c22;
  --accent: #7fb3ff;
  --border: rgba(255, 255, 255, 0.2);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-content: center;
  gap: 12px;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  padding: 24px;
}

button {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

button:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
}

#theme-toggle {
  justify-self: center;
}