:root {
  --bg: #f5f5f4;
  --card: #ffffff;
  --text: #1c1917;
  --muted: #78716c;
  --line: #e7e5e4;
  --accent: #2563eb;
  --danger: #dc2626;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0a09;
    --card: #1c1917;
    --text: #f5f5f4;
    --muted: #a8a29e;
    --line: #292524;
    --accent: #60a5fa;
    --danger: #f87171;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Hiragino Sans", sans-serif;
}
main {
  max-width: 560px;
  margin: 48px auto;
  padding: 0 16px;
}
h1 { font-size: 28px; margin: 0 0 16px; }
form { display: flex; gap: 8px; }
input, button { font: inherit; color: inherit; }
#new-title, .edit {
  flex: 1;
  min-width: 0;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card);
}
form button {
  padding: 10px 16px;
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}
.error { color: var(--danger); margin: 8px 0 0; }
#list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
}
#list:empty { display: none; }
.item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-top: 1px solid var(--line);
}
.item:first-child { border-top: 0; }
.item input[type="checkbox"] { width: 18px; height: 18px; accent-color: var(--accent); }
.title { flex: 1; overflow-wrap: anywhere; cursor: text; }
.done .title { color: var(--muted); text-decoration: line-through; }
.delete {
  border: 0;
  background: none;
  color: var(--muted);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
}
.item:hover .delete, .delete:focus-visible { opacity: 1; }
@media (hover: none) { .delete { opacity: 1; } }
.delete:hover { color: var(--danger); }
footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-top: 12px;
  color: var(--muted);
  font-size: 14px;
}
.filters { display: flex; gap: 4px; }
footer button {
  border: 1px solid transparent;
  border-radius: 6px;
  background: none;
  padding: 4px 8px;
  color: var(--muted);
  cursor: pointer;
}
footer button.selected { border-color: var(--line); color: var(--text); }
footer button:hover { color: var(--text); }