:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #666666;
  --accent: #2f6fdb;
  --border: #dddddd;
  --danger: #b3261e;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #15171a;
    --fg: #e8e8e8;
    --muted: #9a9a9a;
    --accent: #6ea0ff;
    --border: #33363b;
    --danger: #ff8a80;
  }
}
:root[data-theme="dark"] {
  --bg: #15171a;
  --fg: #e8e8e8;
  --muted: #9a9a9a;
  --accent: #6ea0ff;
  --border: #33363b;
  --danger: #ff8a80;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, sans-serif;
  line-height: 1.5;
}
.container { max-width: 40rem; margin: 0 auto; padding: 1rem; }
a { color: var(--accent); }
label { display: block; margin-top: 0.75rem; }
input, textarea {
  display: block;
  width: 100%;
  padding: 0.4rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg);
  color: var(--fg);
  font: inherit;
}
button {
  margin-top: 1rem;
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--accent);
  border-radius: 4px;
  background: var(--accent);
  color: var(--bg);
  font: inherit;
  cursor: pointer;
}
.error { color: var(--danger); }
.muted { color: var(--muted); }
.page-header { display: flex; justify-content: space-between; align-items: center; }
.page-header button { margin-top: 0; }
ul.todos { list-style: none; padding: 0; }
.todo {
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.75rem;
  margin-bottom: 0.75rem;
}
.todo[data-done="true"] .todo-title { text-decoration: line-through; color: var(--muted); }
.todo-description { margin: 0.25rem 0; white-space: pre-wrap; color: var(--muted); }
.todo-actions { display: flex; gap: 0.5rem; }
.todo button { margin-top: 0.5rem; }