:root {
  color-scheme: light dark;
  --bg: #f3f4f6;
  --panel: #ffffff;
  --edge: #e5e7eb;
  --ink: #111827;
  --muted: #6b7280;
  --accent: #059669;
  --accent-ink: #ffffff;
  --danger: #dc2626;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1020;
    --panel: #111827;
    --edge: #374151;
    --ink: #f9fafb;
    --muted: #9ca3af;
    --accent: #34d399;
    --accent-ink: #04121e;
    --danger: #f87171;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100dvh;
  display: grid;
  place-items: start center;
  padding: 16px;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.5 system-ui, sans-serif;
}

main {
  width: min(100%, 30rem);
  margin-top: clamp(1rem, 8vh, 5rem);
  background: var(--panel);
  border: 1px solid var(--edge);
  border-radius: 14px;
  padding: 20px;
  box-shadow: 0 10px 30px rgb(0 0 0 / 0.08);
}

h1 { margin: 0 0 16px; font-size: 1.5rem; }

form { display: flex; gap: 8px; }

input[type="text"] {
  flex: 1;
  min-width: 0;
  font: inherit;
  padding: 10px 12px;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--edge);
  border-radius: 9px;
}

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

button {
  font: inherit;
  padding: 10px 14px;
  border-radius: 9px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
  cursor: pointer;
  touch-action: manipulation;
}

ul { list-style: none; margin: 16px 0 0; padding: 0; }

li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 2px;
  border-top: 1px solid var(--edge);
}

li span { flex: 1; overflow-wrap: anywhere; }

li.done span { text-decoration: line-through; color: var(--muted); }

input[type="checkbox"] {
  width: 1.15rem;
  height: 1.15rem;
  accent-color: var(--accent);
  flex: none;
  cursor: pointer;
}

.del {
  flex: none;
  padding: 2px 9px;
  font-size: 1.1rem;
  line-height: 1.4;
  color: var(--muted);
  background: transparent;
  border-color: transparent;
  font-weight: 400;
}

.del:hover { color: var(--danger); border-color: var(--edge); }

footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--edge);
  color: var(--muted);
  font-size: 0.9rem;
}

#clear {
  padding: 5px 10px;
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--muted);
  background: transparent;
  border-color: var(--edge);
}

#clear:hover { color: var(--ink); }