:root {
  --bg: #f6f6f4; --card: #ffffff; --ink: #1c1c1a; --muted: #6f6f6a;
  --line: #e4e4df; --accent: #2f6fed; --accent-ink: #ffffff; --danger: #c43d3d;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #141413; --card: #1e1e1c; --ink: #ececea; --muted: #9a9a94; --line: #2e2e2b; --accent: #6b9cff; --accent-ink: #0d1a33; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.45 system-ui, -apple-system, Segoe UI, Roboto, sans-serif; }
.app { max-width: 560px; margin: 8vh auto; padding: 0 16px; }
header { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 16px; }
h1 { font-size: 28px; margin: 0; letter-spacing: -0.02em; }
.meta { margin: 0; color: var(--muted); font-size: 14px; }
form { display: flex; gap: 8px; margin-bottom: 12px; }
input[type=text] { flex: 1; padding: 12px 14px; font: inherit; border: 1px solid var(--line); border-radius: 10px; background: var(--card); color: var(--ink); }
input[type=text]:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: transparent; }
button { font: inherit; padding: 10px 16px; border-radius: 10px; border: 1px solid var(--line); background: var(--card); color: var(--ink); cursor: pointer; }
form button { background: var(--accent); color: var(--accent-ink); border-color: transparent; font-weight: 600; }
button:hover { filter: brightness(0.97); }
.filters { display: flex; gap: 6px; align-items: center; margin-bottom: 12px; }
.filters button { padding: 6px 12px; font-size: 14px; border-radius: 999px; }
.filters button.active { background: var(--ink); color: var(--bg); border-color: transparent; }
.filters .spacer { flex: 1; }
.ghost { color: var(--muted); border-color: transparent; background: transparent; }
.list { list-style: none; margin: 0; padding: 0; background: var(--card); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.list:empty { display: none; }
.item { display: flex; align-items: center; gap: 12px; padding: 12px 14px; border-top: 1px solid var(--line); }
.item:first-child { border-top: none; }
.item input[type=checkbox] { width: 18px; height: 18px; accent-color: var(--accent); flex: none; cursor: pointer; }
.item .title { flex: 1; min-width: 0; overflow-wrap: anywhere; cursor: text; padding: 2px 4px; border-radius: 6px; }
.item .title:focus { outline: 2px solid var(--accent); }
.item.done .title { color: var(--muted); text-decoration: line-through; }
.item .del { padding: 4px 8px; color: var(--muted); border-color: transparent; background: transparent; font-size: 18px; line-height: 1; }
.item .del:hover { color: var(--danger); }
.empty { color: var(--muted); text-align: center; padding: 24px; }
.error { color: var(--danger); font-size: 14px; }