:root {
  --bg: #f6f6f4;
  --card: #ffffff;
  --text: #1d1d1b;
  --muted: #74746f;
  --line: #e3e3de;
  --accent: #2f6fdb;
  --warn-bg: #fff4d6;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161615;
    --card: #20201e;
    --text: #ececea;
    --muted: #9a9a94;
    --line: #34342f;
    --accent: #6b9cf0;
    --warn-bg: #3a3218;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", 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[type="text"] {
  flex: 1;
  min-width: 0;
  padding: 10px 12px;
  font: inherit;
  color: inherit;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
}

input[type="text"]:focus { outline: 2px solid var(--accent); outline-offset: -1px; }

button {
  font: inherit;
  color: inherit;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
}

form button { background: var(--accent); border-color: var(--accent); color: #fff; }

ul {
  list-style: none;
  margin: 16px 0;
  padding: 0;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
}

li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
}

li:last-child { border-bottom: 0; }

li label { flex: 1; display: flex; align-items: center; gap: 10px; cursor: pointer; overflow-wrap: anywhere; }
li input[type="checkbox"] { width: 18px; height: 18px; accent-color: var(--accent); }
li.done span { text-decoration: line-through; color: var(--muted); }
li.empty { color: var(--muted); justify-content: center; }

.delete { border: 0; background: none; color: var(--muted); font-size: 20px; line-height: 1; padding: 4px 8px; }
.delete:hover { color: var(--text); }

footer { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; color: var(--muted); font-size: 14px; }
footer #count { margin-right: auto; }
.filters { display: flex; gap: 4px; }
.filters button, #clear-done { padding: 4px 10px; font-size: 14px; }
.filters button[aria-pressed="true"] { border-color: var(--accent); color: var(--accent); }

.warning { background: var(--warn-bg); padding: 8px 12px; border-radius: 8px; font-size: 14px; }
.hint { color: var(--muted); font-size: 13px; margin-top: 24px; }