:root {
  --bg: #f7f7f5;
  --card: #ffffff;
  --text: #1a1a1a;
  --muted: #6b6b6b;
  --border: #e5e5e3;
  --accent: #2563eb;
  --done: #9ca3af;
  --danger: #dc2626;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17181a;
    --card: #232427;
    --text: #f0f0ef;
    --muted: #9a9a9a;
    --border: #34353a;
    --accent: #5b8bf0;
    --done: #6b6b6b;
    --danger: #f26565;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

main {
  max-width: 560px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

h1 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0 0 1.5rem;
}

#add-form {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

#add-input {
  flex: 1;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
  color: var(--text);
  font-size: 0.95rem;
}

#add-input:focus {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
}

#add-form button {
  padding: 0.65rem 1.1rem;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
}

#add-form button:hover { opacity: 0.9; }

#list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.todo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 0.9rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.todo input[type="checkbox"] {
  width: 1.1rem;
  height: 1.1rem;
  flex-shrink: 0;
  accent-color: var(--accent);
  cursor: pointer;
}

.todo-body {
  flex: 1;
  min-width: 0;
}

.todo-text {
  font-size: 0.95rem;
  word-break: break-word;
}

.todo.done .todo-text {
  color: var(--done);
  text-decoration: line-through;
}

.todo-meta {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.2rem;
  font-size: 0.78rem;
  color: var(--muted);
}

.badge-source {
  padding: 0.05rem 0.4rem;
  border-radius: 999px;
  border: 1px solid var(--border);
}

.todo-delete {
  background: none;
  border: none;
  color: var(--muted);
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  padding: 0.25rem;
  flex-shrink: 0;
}

.todo-delete:hover { color: var(--danger); }

.empty {
  color: var(--muted);
  text-align: center;
  margin-top: 2rem;
  font-size: 0.9rem;
}