:root{--bg:#0d0d0d;--surface:#1a1a1a;--border:#2a2a2a;--text:#e0e0e0;--muted:#6b6b6b;--accent:#f0c040;--danger:#d94f4f;--radius:8px}*,:before,:after{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--text);justify-content:center;min-height:100vh;padding-top:4rem;font-family:system-ui,-apple-system,sans-serif;display:flex}#app{width:100%;max-width:480px;padding:0 1rem}h1{letter-spacing:-.02em;margin-bottom:1.5rem;font-size:1.6rem;font-weight:700}.todo-form{gap:.5rem;margin-bottom:1.5rem;display:flex}.todo-form input{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);color:var(--text);outline:none;flex:1;padding:.6rem .8rem;font-size:.95rem;transition:border-color .15s}.todo-form input:focus{border-color:var(--accent)}.todo-form button{background:var(--accent);color:var(--bg);border-radius:var(--radius);cursor:pointer;border:none;padding:.6rem 1rem;font-size:.9rem;font-weight:600;transition:opacity .15s}.todo-form button:hover{opacity:.85}.todo-list{flex-direction:column;gap:.35rem;list-style:none;display:flex}.todo-item{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);align-items:center;gap:.65rem;padding:.5rem .7rem;transition:border-color .15s;display:flex}.todo-item:hover{border-color:var(--accent)}.todo-item.done .todo-text{color:var(--muted);text-decoration:line-through}.checkbox{border:2px solid var(--border);cursor:pointer;border-radius:4px;flex-shrink:0;justify-content:center;align-items:center;width:18px;height:18px;transition:background .15s,border-color .15s;display:flex}.todo-item.done .checkbox{background:var(--accent);border-color:var(--accent)}.todo-text{word-break:break-word;flex:1;font-size:.95rem}.delete-btn{color:var(--muted);cursor:pointer;background:0 0;border:none;border-radius:4px;flex-shrink:0;padding:.15rem .3rem;font-size:1.1rem;transition:color .15s,background .15s}.delete-btn:hover{color:var(--danger);background:#d94f4f1a}.empty-state{text-align:center;color:var(--muted);padding:2rem 0;font-size:.95rem}