:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --ink: #16181d;
  --muted: #6b7280;
  --line: #e5e7eb;
  --accent: #4b5cc4;
  --done: #16a34a;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --card: #1c1f26;
    --ink: #e8eaed;
    --muted: #9aa1ad;
    --line: #2b303a;
    --accent: #8b9bff;
    --done: #4ade80;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 2rem 1rem;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.app { max-width: 640px; margin: 0 auto; }

h1 { margin: 0; font-size: 1.6rem; letter-spacing: -0.01em; }
.sub { margin: 0.25rem 0 1.5rem; color: var(--muted); font-size: 0.9rem; }

.stats { display: flex; gap: 0.75rem; margin-bottom: 1.25rem; }
.stat {
  flex: 1; background: var(--card); border: 1px solid var(--line);
  border-radius: 10px; padding: 0.75rem 1rem; text-align: center;
}
.num { display: block; font-size: 1.5rem; font-weight: 600; font-variant-numeric: tabular-nums; }
.lbl { color: var(--muted); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; }

form { display: flex; gap: 0.5rem; margin-bottom: 1rem; }
input {
  flex: 1; padding: 0.7rem 0.9rem; border-radius: 10px;
  border: 1px solid var(--line); background: var(--card); color: var(--ink); font-size: 1rem;
}
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
button {
  padding: 0.7rem 1.1rem; border: 0; border-radius: 10px;
  background: var(--accent); color: #fff; font-size: 1rem; cursor: pointer;
}
button:hover { filter: brightness(1.08); }

.tasks { list-style: none; margin: 0; padding: 0; }
.tasks li {
  display: flex; align-items: center; gap: 0.75rem;
  background: var(--card); border: 1px solid var(--line);
  border-radius: 10px; padding: 0.7rem 0.9rem; margin-bottom: 0.5rem;
}
.tasks .title { flex: 1; word-break: break-word; }
.tasks li.done .title { text-decoration: line-through; color: var(--muted); }
.tasks .check {
  width: 22px; height: 22px; border-radius: 6px; border: 1px solid var(--line);
  background: transparent; padding: 0; cursor: pointer; color: var(--done); font-size: 14px;
}
.tasks .del {
  background: transparent; color: var(--muted); border: 0;
  font-size: 1.1rem; padding: 0 0.25rem; cursor: pointer;
}
.tasks .del:hover { color: #dc2626; }

.empty { color: var(--muted); text-align: center; padding: 1.5rem 0; }

footer {
  margin-top: 2rem; padding-top: 1rem; border-top: 1px solid var(--line);
  color: var(--muted); font-size: 0.8rem; display: flex; gap: 0.5rem; align-items: center;
}
footer a { color: var(--muted); }
.dot { opacity: 0.5; }