:root{font-family:system-ui,-apple-system,sans-serif;line-height:1.5;color:#1a1a1a;background:#f5f5f5}*{box-sizing:border-box}body{margin:0}.app{max-width:640px;margin:0 auto;padding:2rem 1rem}header{margin-bottom:1.5rem}h1{margin:0 0 .25rem;font-size:1.75rem}.subtitle{margin:0;color:#666}.add-form{display:flex;gap:.5rem;margin-bottom:1.5rem}.add-form input{flex:1;padding:.625rem .75rem;border:1px solid #ccc;border-radius:6px;font-size:1rem}button{padding:.625rem 1rem;border:none;border-radius:6px;background:#2563eb;color:#fff;font-size:.875rem;cursor:pointer}button:disabled{opacity:.6;cursor:not-allowed}.todo-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.5rem}.todo-item{display:grid;grid-template-columns:1fr auto auto;align-items:center;gap:.75rem;padding:.75rem 1rem;background:#fff;border-radius:8px;border:1px solid #e5e5e5}.todo-item label{display:flex;align-items:center;gap:.625rem;cursor:pointer}.todo-item.completed span{text-decoration:line-through;color:#888}.todo-item time{font-size:.75rem;color:#888;white-space:nowrap}.todo-item button{background:#dc2626;padding:.375rem .625rem}.status{color:#666}.status.error{color:#dc2626}