*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background-color:#f5f5f5;color:#333}.app{max-width:800px;margin:0 auto;padding:20px}header h1{text-align:center;color:#2563eb;margin-bottom:30px}.task-form{background:#fff;padding:20px;border-radius:8px;box-shadow:0 2px 4px #0000001a;margin-bottom:30px}.form-group{margin-bottom:15px}.task-form input,.task-form textarea{width:100%;padding:10px;border:1px solid #ddd;border-radius:4px;font-size:16px}.task-form button{background:#2563eb;color:#fff;border:none;padding:12px 24px;border-radius:4px;cursor:pointer;font-size:16px}.task-item{background:#fff;padding:15px;border-radius:8px;box-shadow:0 2px 4px #0000001a;margin-bottom:10px;display:flex;justify-content:space-between;align-items:flex-start}.task-item.completed{opacity:.7}.task-item.completed h3{text-decoration:line-through}.task-header{display:flex;align-items:center;gap:10px}.delete-btn{background:#dc2626;color:#fff;border:none;padding:8px 16px;border-radius:4px;cursor:pointer}.loading,.empty{text-align:center;padding:40px;color:#666}