:root{--bg:#f6f7f9;--card:#fff;--text:#1a1d21;--muted:#8a9099;--border:#e3e6ea;--accent:#2f6fed;--danger:#d64545}@media (prefers-color-scheme:dark){:root{--bg:#14161a;--card:#1c1f24;--text:#e8eaed;--muted:#868d97;--border:#2b3037;--accent:#5b8dff;--danger:#e06a6a}}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0;padding:3rem 1rem;font:16px/1.5 system-ui,-apple-system,Segoe UI,sans-serif}main{max-width:32rem;margin:0 auto}h1{margin:0 0 .35rem;font-size:1.5rem}.subtitle{color:var(--muted);margin:0 0 1.25rem;font-size:.875rem}form{gap:.5rem;margin-bottom:1.25rem;display:flex}input[type=text]{font:inherit;color:var(--text);background:var(--card);border:1px solid var(--border);border-radius:8px;flex:1;padding:.65rem .85rem}input[type=text]:focus{outline:2px solid var(--accent);outline-offset:-1px}button{font:inherit;cursor:pointer;border:1px solid #0000;border-radius:8px}button[type=submit]{color:#fff;background:var(--accent);padding:.65rem 1.1rem}button:disabled{opacity:.5;cursor:not-allowed}ul{flex-direction:column;gap:.5rem;margin:0;padding:0;list-style:none;display:flex}li{background:var(--card);border:1px solid var(--border);border-radius:8px;align-items:center;gap:.75rem;padding:.75rem .85rem;display:flex}li input[type=checkbox]{width:1.1rem;height:1.1rem;accent-color:var(--accent);cursor:pointer;flex-shrink:0}li span{word-break:break-word;flex:1}li.done span{color:var(--muted);text-decoration:line-through}li button{color:var(--muted);background:0 0;padding:.25rem .5rem;font-size:1.1rem;line-height:1}li button:hover:not(:disabled){color:var(--danger)}.empty{color:var(--muted);text-align:center;padding:2rem 0}.error{color:var(--danger);background:var(--card);border:1px solid var(--danger);border-radius:8px;margin-bottom:1rem;padding:.75rem .85rem}