:root{--bg: #f4f4f5;--card: #ffffff;--text: #18181b;--muted: #71717a;--border: #e4e4e7;--accent: #2563eb;--danger: #dc2626;font-family:system-ui,-apple-system,Segoe UI,sans-serif;color:var(--text);background:var(--bg)}@media (prefers-color-scheme: dark){:root{--bg: #09090b;--card: #18181b;--text: #fafafa;--muted: #a1a1aa;--border: #27272a}}*{box-sizing:border-box}body{margin:0;background:var(--bg)}.app{max-width:560px;margin:48px auto;padding:24px;background:var(--card);border:1px solid var(--border);border-radius:12px}h1{margin:0 0 20px;font-size:28px}input,button{font:inherit;color:inherit}.add{display:flex;gap:8px}.add input,.edit{flex:1;padding:10px 12px;background:transparent;border:1px solid var(--border);border-radius:8px}.add button{padding:10px 16px;background:var(--accent);color:#fff;border:none;border-radius:8px;cursor:pointer}.filters{display:flex;gap:6px;margin:16px 0 8px}.filters button{padding:4px 12px;background:transparent;border:1px solid var(--border);border-radius:999px;text-transform:capitalize;cursor:pointer}.filters button.active{border-color:var(--accent);color:var(--accent)}.list{list-style:none;margin:0;padding:0}.todo{display:flex;align-items:center;gap:10px;padding:10px 4px;border-bottom:1px solid var(--border)}.todo .title{flex:1;cursor:text;word-break:break-word}.todo.done .title{text-decoration:line-through;color:var(--muted)}.delete{background:none;border:none;color:var(--muted);font-size:20px;line-height:1;cursor:pointer}.delete:hover,.error{color:var(--danger)}.muted{color:var(--muted);font-size:14px}footer{margin-top:16px}