:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #1c2330;
  --muted: #667085;
  --line: #e4e7ec;
  --accent: #2f5bea;
  --accent-text: #ffffff;
  --ok: #067647;
  --ok-bg: #dcfae6;
  --bad: #b42318;
  --bad-bg: #fee4e2;
  --unknown: #475467;
  --unknown-bg: #eaecf0;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151c;
    --card: #1b202b;
    --text: #e8ebf2;
    --muted: #98a2b3;
    --line: #2b3240;
    --accent: #6d8dff;
    --accent-text: #0d1220;
    --ok: #75e0a7;
    --ok-bg: #0b3a24;
    --bad: #fda29b;
    --bad-bg: #4a1612;
    --unknown: #cbd2e0;
    --unknown-bg: #2b3240;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: start center;
  padding: 48px 16px;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.card {
  width: 100%;
  max-width: 560px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 24px;
}

.top { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
h1 { margin: 0; font-size: 1.4rem; }

.pill { font-size: 0.8rem; padding: 3px 10px; border-radius: 999px; white-space: nowrap; }
.pill-ok { color: var(--ok); background: var(--ok-bg); }
.pill-bad { color: var(--bad); background: var(--bad-bg); }
.pill-unknown { color: var(--unknown); background: var(--unknown-bg); }

.add { display: flex; gap: 8px; margin: 20px 0 8px; }
.add input {
  flex: 1;
  min-width: 0;
  padding: 10px 12px;
  font: inherit;
  color: var(--text);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 8px;
}
.add input:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.add button {
  padding: 10px 18px;
  font: inherit;
  font-weight: 600;
  color: var(--accent-text);
  background: var(--accent);
  border: 0;
  border-radius: 8px;
  cursor: pointer;
}

.error { margin: 8px 0; padding: 8px 12px; color: var(--bad); background: var(--bad-bg); border-radius: 8px; }

.tasks { list-style: none; margin: 12px 0 0; padding: 0; }
.task { display: flex; align-items: center; gap: 12px; padding: 10px 0; border-top: 1px solid var(--line); }
.task input[type="checkbox"] { width: 18px; height: 18px; accent-color: var(--accent); cursor: pointer; }
.task .title { flex: 1; overflow-wrap: anywhere; }
.task.done .title { color: var(--muted); text-decoration: line-through; }
.task .del {
  padding: 2px 8px;
  font: inherit;
  color: var(--muted);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 6px;
  cursor: pointer;
}
.task .del:hover { color: var(--bad); border-color: var(--line); }

.empty { color: var(--muted); text-align: center; margin: 24px 0 8px; }

.foot { display: flex; justify-content: space-between; gap: 12px; margin-top: 20px; padding-top: 12px; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.8rem; }

.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }