:root {
  --bg: #f4f5f7; --card: #fff; --text: #1a1d23; --muted: #6b7280; --border: #e2e5ea;
  --accent: #2563eb; --danger: #dc2626; --ok: #16a34a;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #111318; --card: #1b1e25; --text: #e8eaee; --muted: #9097a3; --border: #2b303a; --accent: #4c8dff; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.4 system-ui, sans-serif;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left); }
main { max-width: 640px; margin: 0 auto; padding: 16px 16px 90px; }
h1, h2 { margin: 0 0 12px; }
h1 { font-size: 1.4rem; } h2 { font-size: 1.1rem; margin-top: 24px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 12px 14px; margin-bottom: 10px; }
.task { display: flex; gap: 12px; align-items: center; }
.task .info { flex: 1; min-width: 0; cursor: pointer; }
.task .title { font-weight: 600; overflow-wrap: anywhere; }
.meta { color: var(--muted); font-size: .85rem; }
.overdue .when { color: var(--danger); font-weight: 600; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: var(--accent); color: #fff; border: 0; border-radius: 8px; padding: 8px 14px; cursor: pointer; }
button.secondary { background: transparent; color: var(--accent); border: 1px solid var(--border); }
button.danger { background: var(--danger); }
button.check { width: 44px; height: 44px; border-radius: 50%; padding: 0; font-size: 1.3rem; background: transparent; color: var(--ok); border: 2px solid var(--ok); flex: none; }
input, select, textarea { width: 100%; padding: 9px 10px; border: 1px solid var(--border); border-radius: 8px; background: var(--card); }
input[type=checkbox] { width: auto; }
label { display: block; margin: 12px 0 4px; font-size: .9rem; color: var(--muted); }
label.inline { display: flex; gap: 8px; align-items: center; color: var(--text); }
.row { display: flex; gap: 8px; margin-top: 14px; }
.row > * { flex: 1; }
nav { position: fixed; bottom: 0; left: 0; right: 0; display: flex; background: var(--card); border-top: 1px solid var(--border);
  padding-bottom: env(safe-area-inset-bottom); }
nav button { flex: 1; background: none; color: var(--muted); border-radius: 0; padding: 14px 4px; }
nav button.active { color: var(--accent); font-weight: 600; }
.fab { position: fixed; right: 18px; bottom: calc(76px + env(safe-area-inset-bottom)); width: 56px; height: 56px; border-radius: 50%; font-size: 1.8rem; padding: 0; box-shadow: 0 4px 12px #0004; }
.login { max-width: 340px; margin: 18vh auto 0; padding: 16px; }
.err { color: var(--danger); min-height: 1.4em; }
.empty { color: var(--muted); text-align: center; padding: 30px 0; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips label { margin: 0; display: flex; gap: 6px; align-items: center; color: var(--text); background: var(--card); border: 1px solid var(--border); border-radius: 999px; padding: 4px 10px; }